U.S. patent application number 16/923449 was filed with the patent office on 2020-12-31 for apparatus for transmitting broadcast signal, apparatus for receiving broadcast signal, method of transmitting broadcast signal, and method of receiving broadcast signal.
This patent application is currently assigned to LG ELECTRONICS INC.. The applicant listed for this patent is LG ELECTRONICS INC.. Invention is credited to Sungryong HONG, Woosuk KO, Minsung KWAK, Woosuk KWON, Jangwon LEE, Kyoungsoo MOON, Sejin OH.
Application Number | 20200413127 16/923449 |
Document ID | / |
Family ID | 1000005078777 |
Filed Date | 2020-12-31 |
United States Patent
Application |
20200413127 |
Kind Code |
A1 |
KWAK; Minsung ; et
al. |
December 31, 2020 |
APPARATUS FOR TRANSMITTING BROADCAST SIGNAL, APPARATUS FOR
RECEIVING BROADCAST SIGNAL, METHOD OF TRANSMITTING BROADCAST
SIGNAL, AND METHOD OF RECEIVING BROADCAST SIGNAL
Abstract
A method for receiving a broadcast signal includes receiving the
broadcast signal including a signal frame; demodulating the
received broadcast signal by an OFDM (Orthogonal Frequency Division
Multiplex) scheme; frame parsing the signal frame carrying
broadcast data, signaling table for a service, the broadcast data
and the signaling table is transmitted through a broadcast network,
the signaling table including a service identifier identifying the
broadcast service, category information indicating a category of
the broadcast service and bootstrapping information to obtain a
service signaling information for the broadcast service, the
service signaling information is transmitted via either the
broadcast network or a broadband network that is different from the
broadcast network; time de-interleaving the signal frame; parsing
the signaling table to acquire the service signaling information,
the service signaling information is acquired via: the broadband
network based on a bootstrapping information that includes URL
(Uniform Resource Locator) information of the service signaling
information, or the broadcast network based on a bootstrapping
information that includes an IP (Internet Protocol) address of an
IP packet carrying the service signaling information; and parsing
the service signaling information including transport session
information for one or more transport packets carrying one or more
SGDDs (Service Guide Delivery Descriptors).
Inventors: |
KWAK; Minsung; (Seoul,
KR) ; KWON; Woosuk; (Seoul, KR) ; OH;
Sejin; (Seoul, KR) ; MOON; Kyoungsoo; (Seoul,
KR) ; LEE; Jangwon; (Seoul, KR) ; KO;
Woosuk; (Seoul, KR) ; HONG; Sungryong; (Seoul,
KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LG ELECTRONICS INC. |
Seoul |
|
KR |
|
|
Assignee: |
LG ELECTRONICS INC.
Seoul
KR
|
Family ID: |
1000005078777 |
Appl. No.: |
16/923449 |
Filed: |
July 8, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
15121712 |
Aug 25, 2016 |
10715859 |
|
|
PCT/KR2015/010730 |
Oct 12, 2015 |
|
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16923449 |
|
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62062950 |
Oct 12, 2014 |
|
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04N 21/6125 20130101;
H04N 7/08 20130101; H04N 21/4622 20130101; H04N 21/2353 20130101;
H04N 21/64322 20130101; H04N 21/4345 20130101; H04N 5/445 20130101;
H04N 21/2362 20130101; H04N 21/6112 20130101; H04N 21/235 20130101;
H04N 21/2665 20130101; H04N 7/12 20130101; H04N 21/482 20130101;
H04N 7/085 20130101; H04N 21/435 20130101; H04H 60/72 20130101 |
International
Class: |
H04N 21/434 20060101
H04N021/434; H04H 60/72 20060101 H04H060/72; H04N 7/08 20060101
H04N007/08; H04N 7/12 20060101 H04N007/12; H04N 5/445 20060101
H04N005/445; H04N 21/61 20060101 H04N021/61; H04N 21/235 20060101
H04N021/235; H04N 21/462 20060101 H04N021/462; H04N 7/085 20060101
H04N007/085; H04N 21/2362 20060101 H04N021/2362; H04N 21/2665
20060101 H04N021/2665; H04N 21/435 20060101 H04N021/435; H04N
21/482 20060101 H04N021/482; H04N 21/643 20060101 H04N021/643 |
Claims
1. A method for receiving a broadcast signal, the method
comprising: receiving the broadcast signal including a signal
frame; demodulating the received broadcast signal by an OFDM
(Orthogonal Frequency Division Multiplex) scheme; frame parsing the
signal frame carrying broadcast data, signaling table for a
service, the broadcast data and the signaling table is transmitted
through a broadcast network, the signaling table including a
service identifier identifying the broadcast service, category
information indicating a category of the broadcast service and
bootstrapping information to obtain a service signaling information
for the broadcast service, the service signaling information is
transmitted via either the broadcast network or a broadband network
that is different from the broadcast network; time de-interleaving
the signal frame; parsing the signaling table to acquire the
service signaling information, the service signaling information is
acquired via: the broadband network based on a bootstrapping
information that includes URL (Uniform Resource Locator)
information of the service signaling information, or the broadcast
network based on a bootstrapping information that includes an IP
(Internet Protocol) address of an IP packet carrying the service
signaling information; and parsing the service signaling
information including transport session information for one or more
transport packets carrying one or more SGDDs (Service Guide
Delivery Descriptors).
2. The method of claim 1, wherein the transport session information
includes ROUTE session information of a ROUTE session to which the
one or more transport packets belong.
3. The method of claim 1, wherein the method further comprising:
acquiring components carried in the one or more transport packets,
and wherein the components are data for ESG (Electronic Service
Guide) service, that is represented by in response to the service
identifier and the category information, carried in one or more
SGDUs (Service Guide Delivery Units), the service signaling
information describing transport session information of one or more
transport sessions in which the SGDUs are carried.
4. The method of claim 1, wherein the service signaling information
includes an MPD (Media Presentation Description).
5. The method of claim 1, wherein a payload of the transport packet
carries one of a contiguous portion of an object for the broadcast
service.
6. An apparatus for receiving a broadcast signal, the apparatus
comprising: a tuner configured to receive the broadcast signal
including a signal frame; a demodulator configured to demodulate
the received broadcast signal by an OFDM (Orthogonal Frequency
Division Multiplex) scheme; a frame parser configured to parse the
signal frame carrying broadcast data, signaling table for a
service, the broadcast data and the signaling table is transmitted
through a broadcast network, the signaling table including a
service identifier identifying the broadcast service, category
information indicating a category of the broadcast service and
bootstrapping information to obtain a service signaling information
for the broadcast service, the service signaling information is
transmitted via either the broadcast network or a broadband network
that is different from the broadcast network; a time de-interleaver
configured to time de-interleave the signal frame; a signaling
table parser configured to parse the signaling table to acquire the
service signaling information, the service signaling information is
acquired via: the broadband network based on a bootstrapping
information that includes URL (Uniform Resource Locator)
information of the service signaling information, or the broadcast
network based on a bootstrapping information that includes an IP
(Internet Protocol) address of an IP packet carrying the service
signaling information; and a service signaling parser configured to
parse the service signaling information including transport session
information for one or more transport packets carrying one or more
SGDDs (Service Guide Delivery Descriptors).
7. The apparatus of claim 6, wherein the transport session
information includes ROUTE session information of a ROUTE session
to which the one or more transport packets belong.
8. The apparatus of claim 6, wherein the service signaling parser
parses the service signaling information to acquire components
carried in the one or more transport packets, and wherein the
components are data for ESG (Electronic Service Guide) service,
that is represented by in response to the service identifier and
the category information, carried in one or more SGDUs (Service
Guide Delivery Units), the service signaling information describing
transport session information of one or more transport sessions in
which the SGDUs are carried.
9. The apparatus of claim 6, wherein the service signaling
information includes an MPD (Media Presentation Description).
10. The apparatus of claim 6, wherein a payload of the transport
packet carries one of a contiguous portion of an object for the
broadcast service.
11. A method for transmitting a broadcast signal, the method
comprising: encoding broadcast data and signaling table for a
broadcast service through a broadcast network, wherein the
signaling table including a service identifier identifying the
broadcast service, category information indicating a category of
the broadcast service and bootstrapping information to obtain a
service signaling information for the broadcast service, the
service signaling information is transmitted via either the
broadcast network or a broadband network that is different from the
broadcast network, the bootstrapping information includes either:
URL (Uniform Resource Locator) information of the service signaling
information that is transmitted via the broadband network, or an IP
(Internet Protocol) address of an IP packet carrying the service
signaling information that is transmitted via the broadcast
network; the service signaling information including transport
session information for one or more transport packets carrying one
or more SGDDs (Service Guide Delivery Descriptors); time
interleaving the encoded data; generating a signal frame including
the time interleaved data; modulating the signal frame by an OFDM
(Orthogonal Frequency Division Multiplex) scheme; and transmitting
the broadcast signal including the modulated signal frame.
12. The method of claim 11, wherein the transport session
information includes ROUTE session information of a ROUTE session
to which the one or more transport packets belong.
13. The method of claim 11, wherein the one or more transport
packets includes components, and wherein the components are data
for ESG (Electronic Service Guide) service, that is represented by
in response to the service identifier and the category information,
carried in one or more SGDUs (Service Guide Delivery Units), the
service signaling information describing transport session
information of one or more transport sessions in which the SGDUs
are carried.
14. The method of claim 11, wherein the service signaling
information includes an MPD (Media Presentation Description).
15. The method of claim 11, wherein a payload of the transport
packet carries one of a contiguous portion of an object for the
broadcast service.
16. An apparatus for transmitting a broadcast signal, the apparatus
comprising: an encoder configured to encode broadcast data and
signaling table for a broadcast service through a broadcast
network, wherein the signaling table including a service identifier
identifying the broadcast service, category information indicating
a category of the broadcast service and bootstrapping information
to obtain a service signaling information for the broadcast
service, the service signaling information is transmitted via
either the broadcast network or a broadband network that is
different from the broadcast network, the bootstrapping information
includes either: URL (Uniform Resource Locator) information of the
service signaling information that is transmitted via the broadband
network, or an IP (Internet Protocol) address of an IP packet
carrying the service signaling information that is transmitted via
the broadcast network; the service signaling information including
transport session information for one or more transport packets
carrying one or more SGDDs (Service Guide Delivery Descriptors);
time interleaver configured to time interleave the encoded data;
frame builder configured to generate a signal frame including the
time interleaved data; a modulator configured to modulate the
signal frame by an OFDM (Orthogonal Frequency Division Multiplex)
scheme; and a transmitter configured to transmit the broadcast
signal including the modulated signal frame.
17. The apparatus of claim 16, wherein the transport session
information includes ROUTE session information of a ROUTE session
to which the one or more transport packets belong.
18. The apparatus of claim 16, wherein the one or more transport
packets includes components, and wherein the components are data
for ESG (Electronic Service Guide) service, that is represented by
in response to the service identifier and the category information,
carried in one or more SGDUs (Service Guide Delivery Units), the
service signaling information describing transport session
information of one or more transport sessions in which the SGDUs
are carried.
19. The apparatus of claim 16, wherein the service signaling
information includes an MPD (Media Presentation Description).
20. The apparatus of claim 16, wherein a payload of the transport
packet carries one of a contiguous portion of an object for the
broadcast service.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Continuation of co-pending U.S. patent
application Ser. No. 15/121,712 filed on Aug. 25, 2016, which is
the National Phase of PCT International Application No.
PCT/KR2015/010730 filed on Oct. 12, 2015, which claims the priority
benefit under 35 U.S.C. .sctn. 119(e) to U.S. Provisional
Application No. 62/062,950 filed on Oct. 12, 2014, all of which are
hereby expressly incorporated by reference into the present
application.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] The present invention relates to an apparatus for
transmitting a broadcast signal, an apparatus for receiving a
broadcast signal and methods of transmitting and receiving a
broadcast signal.
Discussion of the Related Art
[0003] As analog broadcast signal transmission comes to an end,
various technologies for transmitting/receiving digital broadcast
signals are being developed. A digital broadcast signal may include
a larger amount of video/audio data than an analog broadcast signal
and further include various types of additional data in addition to
the video/audio data.
SUMMARY OF THE INVENTION
[0004] That is, a digital broadcast system can provide HD (high
definition) images, multichannel audio and various additional
services. However, data transmission efficiency for transmission of
large amounts of data, robustness of transmission/reception
networks and network flexibility in consideration of mobile
reception equipment need to be improved for digital broadcast.
[0005] The present invention proposes a system capable of
effectively supporting future broadcast services in an environment
supporting future hybrid broadcasting using terrestrial broadcast
networks and the Internet and related signaling methods, as
included and roughly described herein according to the purpose of
the present invention.
[0006] A broadcast reception method according to an embodiment of
the present invention includes: receiving a broadcast signal
including service data and signaling information for a service,
wherein the signaling information includes first signaling
information for acquisition of the service, wherein the signaling
information includes second signaling information including
bootstrap information for the service; acquiring the service data
on the basis of the signaling information; and decoding the service
data, wherein the signaling information includes electronic service
guide (ESG) bootstrap information for ESG data.
[0007] The ESG bootstrap information may include type information
indicating a transmission type of the ESG data.
[0008] The ESG bootstrap information may include at least one of a
source IP address element indicating a source IP address of the ESG
data, a destination IP address element indicating a destination IP
address of the ESG data and a destination port number element
indicating a destination port number of the ESG data.
[0009] The ESG bootstrap information may include at least one of a
transportStreamID element identifying a frequency at which the ESG
data is transmitted, a partitionID element identifying a partition
of the frequency, a PLP ID element indicating a physical layer pipe
(PLP) through which the ESG data is transmitted, a TSI element
indicating a transport session in which the ESG data is
transmitted, and a URL element indicating a position of the ESG
data transmitted through broadband.
[0010] The second signaling information may include the ESG
bootstrap information.
[0011] The second signaling information may include category
information indicating the category of the service, wherein the
category information indicates an ESG service.
[0012] The first signaling information may include a transport
session element including information about a transport session,
wherein the transport session element includes a PLP ID element
indicating a PLP for the transport session.
[0013] A broadcast reception apparatus according to an embodiment
of the present invention includes: a broadcast interface for
receiving a broadcast signal including service data and signaling
information for a service, wherein the signaling information
includes first signaling information for acquisition of the
service, wherein the signaling information includes second
signaling information including bootstrap information for the
service; and a controller for acquiring the service data on the
basis of the signaling information, wherein the controller decodes
the service data, wherein the signaling information includes
electronic service guide bootstrap information for ESG data.
[0014] The ESG bootstrap information may include type information
indicating a transmission type of the ESG data.
[0015] The ESG bootstrap information may include at least one of a
source IP address element indicating a source IP address of the ESG
data, a destination IP address element indicating a destination IP
address of the ESG data and a destination port number element
indicating a destination port number of the ESG data.
[0016] The ESG bootstrap information may include at least one of a
transportStreamID element identifying a frequency at which the ESG
data is transmitted, a partitionID element identifying a partition
of the frequency, a PLP ID element indicating a PLP through which
the ESG data is transmitted, a TSI element indicating a transport
session in which the ESG data is transmitted, and a URL element
indicating a position of the ESG data transmitted through
broadband.
[0017] The second signaling information may include the ESG
bootstrap information.
[0018] The second signaling information may include category
information indicating the category of the service, wherein the
category information indicates an ESG service.
[0019] The first signaling information may include a transport
session element including information about a transport session,
wherein the transport session element includes a PLP ID element
indicating a PLP for the transport session.
Advantageous Effects
[0020] The present invention can control quality of service (QoS)
with respect to services or service components by processing data
on the basis of service characteristics, thereby providing various
broadcast services.
[0021] The present invention can achieve transmission flexibility
by transmitting various broadcast services through the same radio
frequency (RF) signal bandwidth.
[0022] The present invention can provide methods and apparatuses
for transmitting and receiving broadcast signals, which enable
digital broadcast signals to be received without error even when a
mobile reception device is used or even in an indoor
environment.
[0023] The present invention can effectively support future
broadcast services in an environment supporting future hybrid
broadcasting using terrestrial broadcast networks and the
Internet.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The accompanying drawings, which are included to provide a
further understanding of the invention and are incorporated in and
constitute a part of this application, illustrate embodiment(s) of
the invention and together with the description serve to explain
the principle of the invention. In the drawings:
[0025] FIG. 1 illustrates a receiver protocol stack according to an
embodiment of the present invention;
[0026] FIG. 2 illustrates a relation between an SLT and service
layer signaling (SLS) according to an embodiment of the present
invention;
[0027] FIG. 3 illustrates an SLT according to an embodiment of the
present invention;
[0028] FIG. 4 illustrates SLS bootstrapping and a service discovery
process according to an embodiment of the present invention;
[0029] FIG. 5 illustrates a USBD fragment for ROUTE/DASH according
to an embodiment of the present invention;
[0030] FIG. 6 illustrates an S-TSID fragment for ROUTE/DASH
according to an embodiment of the present invention;
[0031] FIG. 7 illustrates a USBD/USD fragment for MMT according to
an embodiment of the present invention;
[0032] FIG. 8 illustrates a link layer protocol architecture
according to an embodiment of the present invention;
[0033] FIG. 9 illustrates a structure of a base header of a link
layer packet according to an embodiment of the present
invention;
[0034] FIG. 10 illustrates a structure of an additional header of a
link layer packet according to an embodiment of the present
invention;
[0035] FIG. 11 illustrates a structure of an additional header of a
link layer packet according to another embodiment of the present
invention;
[0036] FIG. 12 illustrates a header structure of a link layer
packet for an MPEG-2 TS packet and an encapsulation process thereof
according to an embodiment of the present invention;
[0037] FIG. 13 illustrates an example of adaptation modes in IP
header compression according to an embodiment of the present
invention (transmitting side);
[0038] FIG. 14 illustrates a link mapping table (LMT) and an RoHC-U
description table according to an embodiment of the present
invention;
[0039] FIG. 15 illustrates a structure of a link layer on a
transmitter side according to an embodiment of the present
invention;
[0040] FIG. 16 illustrates a structure of a link layer on a
receiver side according to an embodiment of the present
invention;
[0041] FIG. 17 illustrates a configuration of signaling
transmission through a link layer according to an embodiment of the
present invention (transmitting/receiving sides);
[0042] FIG. 18 is a block diagram illustrating a configuration of a
broadcast signal transmission apparatus for future broadcast
services according to an embodiment of the present invention;
[0043] FIG. 19 is a block diagram illustrating a bit interleaved
coding & modulation (BICM) block according to an embodiment of
the present invention;
[0044] FIG. 20 is a block diagram illustrating a BICM block
according to another embodiment of the present invention;
[0045] FIG. 21 illustrates a bit interleaving process of physical
layer signaling (PLS) according to an embodiment of the present
invention;
[0046] FIG. 22 is a block diagram illustrating a configuration of a
broadcast signal reception apparatus for future broadcast services
according to an embodiment of the present invention;
[0047] FIG. 23 illustrates a signaling hierarchy structure of a
frame according to an embodiment of the present invention;
[0048] FIG. 24 is a table illustrating PLS1 data according to an
embodiment of the present invention;
[0049] FIG. 25 is a table illustrating PLS2 data according to an
embodiment of the present invention;
[0050] FIG. 26 is a table illustrating PLS2 data according to
another embodiment of the present invention;
[0051] FIG. 27 illustrates a logical structure of a frame according
to an embodiment of the present invention;
[0052] FIG. 28 illustrates PLS mapping according to an embodiment
of the present invention;
[0053] FIG. 29 illustrates time interleaving according to an
embodiment of the present invention;
[0054] FIG. 30 illustrates a basic operation of a twisted
row-column block interleaver according to an embodiment of the
present invention;
[0055] FIG. 31 illustrates an operation of a twisted row-column
block interleaver according to another embodiment of the present
invention;
[0056] FIG. 32 is a block diagram illustrating an interleaving
address generator including a main pseudo-random binary sequence
(PRBS) generator and a sub-PRBS generator according to each FFT
mode according to an embodiment of the present invention;
[0057] FIG. 33 illustrates a main PRBS used for all FFT modes
according to an embodiment of the present invention;
[0058] FIG. 34 illustrates a sub-PRBS used for FFT modes and an
interleaving address for frequency interleaving according to an
embodiment of the present invention;
[0059] FIG. 35 illustrates a write operation of a time interleaver
according to an embodiment of the present invention;
[0060] FIG. 36 is a table illustrating an interleaving type applied
according to the number of PLPs;
[0061] FIG. 37 is a block diagram including a first example of a
structure of a hybrid time interleaver;
[0062] FIG. 38 is a block diagram including a second example of the
structure of the hybrid time interleaver;
[0063] FIG. 39 is a block diagram including a first example of a
structure of a hybrid time deinterleaver;
[0064] FIG. 40 is a block diagram including a second example of the
structure of the hybrid time deinterleaver;
[0065] FIG. 41 is a block diagram illustrating a hybrid broadcast
reception apparatus according to an embodiment of the present
invention;
[0066] FIG. 42 is a block diagram illustrating a hybrid broadcast
receiver according to an embodiment of the present invention;
[0067] FIG. 43 illustrates a protocol stack of a future hybrid
broadcast system according to an embodiment of the present
invention;
[0068] FIG. 44 illustrates a structure of a transport frame
delivered to a physical layer of a future broadcast transmission
system according to an embodiment of the present invention;
[0069] FIG. 45 illustrates a transport packet of an application
layer transport protocol according to an embodiment of the present
invention;
[0070] FIG. 46 illustrates a method for transmitting signaling data
by a future broadcast system according to an embodiment of the
present invention;
[0071] FIG. 47 illustrates signaling data transmitted, for fast
broadcast service scan of a receiver, by the future broadcast
system according to an embodiment of the present invention;
[0072] FIG. 48 illustrates signaling data transmitted, for fast
broadcast service scan of the receiver, by the future broadcast
system according to an embodiment of the present invention;
[0073] FIG. 49 illustrates a method for transmitting FIC based
signaling according to an embodiment of the present invention;
[0074] FIG. 50 illustrates signaling data transmitted, for fast
broadcast service scan of the receiver, by the future broadcast
system according to an embodiment of the present invention;
[0075] FIG. 51 illustrates a method for transmitting FIC based
signaling according to another embodiment of the present
invention;
[0076] FIG. 52 illustrates a service signaling message format of
the future broadcast system according to an embodiment of the
present invention;
[0077] FIG. 53 shows service signaling tables used in the future
broadcast system according to an embodiment of the present
invention;
[0078] FIG. 54 shows a service mapping table used in the future
broadcast system according to an embodiment of the present
invention;
[0079] FIG. 55 shows a service signaling table used in the future
broadcast system according to an embodiment of the present
invention;
[0080] FIG. 56 shows a component mapping table used in the future
broadcast system according to an embodiment of the present
invention;
[0081] FIG. 57 illustrates component mapping table description
according to an embodiment of the present invention;
[0082] FIG. 58 illustrates a syntax of the component mapping table
of the future broadcast system according to an embodiment of the
present invention;
[0083] FIG. 59 illustrates a method for delivering signaling
related to each service through a broadband network in the future
broadcast system according to an embodiment of the present
invention;
[0084] FIG. 60 illustrates a method for signaling an MPD in the
future broadcast system according to an embodiment of the present
invention;
[0085] FIG. 61 illustrates a syntax of an MPD delivery table used
in the future broadcast system according to an embodiment of the
present invention;
[0086] FIG. 62 illustrates transport session instance description
of the future broadcast system according to an embodiment of the
present invention;
[0087] FIG. 63 illustrates a SourceFlow element of the future
broadcast system according to an embodiment of the present
invention;
[0088] FIG. 64 illustrates an EFDT of the future broadcast system
according to an embodiment of the present invention;
[0089] FIG. 65 illustrates a method for transmitting an ISDT used
by the future broadcast system according to an embodiment of the
present invention;
[0090] FIG. 66 illustrates a signaling message delivery structure
of the future broadcast system according to an embodiment of the
present invention;
[0091] FIG. 67 illustrates signaling data transmitted, for fast
broadcast service scan of the receiver, by the future broadcast
system according to an embodiment of the present invention;
[0092] FIG. 68 illustrates signaling data transmitted, for fast
broadcast service scan of the receiver, by the future broadcast
system according to an embodiment of the present invention;
[0093] FIG. 69 illustrates a component mapping table description
according to an embodiment of the present invention;
[0094] FIG. 70 illustrates a component mapping table description
according to an embodiment of the present invention;
[0095] FIGS. 71 and 72 illustrate component mapping table
descriptions according to an embodiment of the present
invention;
[0096] FIG. 73 illustrates a component mapping table description
according to an embodiment of the present invention;
[0097] FIG. 74 illustrates common attributes and elements of an MPD
according to an embodiment of the present invention;
[0098] FIG. 75 illustrates a transport session instance description
according to an embodiment of the present invention;
[0099] FIG. 76 illustrates a SourceFlow element of the future
broadcast system according to an embodiment of the present
invention;
[0100] FIG. 77 illustrates signaling data transmitted, for fast
broadcast service scan of a receiver, by a future broadcast system
according to another embodiment of the present invention;
[0101] FIG. 78 illustrates signaling data transmitted, for fast
broadcast service scan of the receiver, by a future broadcast
system according to another embodiment of the present
invention;
[0102] FIG. 79 illustrates a method for acquiring service layer
signaling in the future broadcast system according to an embodiment
of the present invention;
[0103] FIG. 80 illustrates a method for acquiring service layer
signaling and link layer signaling in the future broadcast system
according to an embodiment of the present invention;
[0104] FIG. 81 illustrates a method for acquiring service layer
signaling in the future broadcast system according to an embodiment
of the present invention;
[0105] FIG. 82 illustrates a method for acquiring service layer
signaling and link layer signaling in the future broadcast system
according to an embodiment of the present invention;
[0106] FIG. 83 illustrates a method for delivering service layer
signaling in the future broadcast system according to an embodiment
of the present invention;
[0107] FIG. 84 illustrates a method for delivering service layer
signaling and link layer signaling in the future broadcast system
according to an embodiment of the present invention;
[0108] FIG. 85 illustrates a method for delivering service layer
signaling in the future broadcast system according to an embodiment
of the present invention;
[0109] FIG. 86 illustrates a method for delivering service layer
signaling and link layer signaling in the future broadcast system
according to an embodiment of the present invention;
[0110] FIG. 87 illustrates a method for transmitting service layer
signaling in the future broadcast system according to an embodiment
of the present invention;
[0111] FIG. 88 illustrates a method for delivering service layer
signaling in the future broadcast system according to an embodiment
of the present invention;
[0112] FIG. 89 illustrates a syntax of a header of a signaling
message according to another embodiment of the present
invention;
[0113] FIG. 90 illustrates a protocol stack which processes a DASH
initialization segment according to an embodiment of the present
invention;
[0114] FIG. 91 illustrates part of layered coding transport (LCT)
session instance description (LSID) according to an embodiment of
the present invention;
[0115] FIG. 92 illustrates a signaling object description (SOD)
providing information for filtering a service signaling message
according to an embodiment of the present invention;
[0116] FIG. 93 illustrates an object including a signaling message
according to an embodiment of the present invention;
[0117] FIG. 94 illustrates TOI configuration description (TCD)
according to an embodiment of the present invention;
[0118] FIG. 95 illustrates a payload format element of a transport
packet according to an embodiment of the present invention;
[0119] FIG. 96 illustrates TOI configuration instance description
(TCID) according to an embodiment of the present invention;
[0120] FIG. 97 illustrates a syntax of a payload of a fast
information channel (FIC) according to an embodiment of the present
invention;
[0121] FIG. 98 illustrates a syntax of a payload of an FIC
according to another embodiment of the present invention;
[0122] FIG. 99 illustrates a syntax of serving level signaling
according to another embodiment of the present invention;
[0123] FIG. 100 illustrates a component mapping description
according to another embodiment of the present invention;
[0124] FIG. 101 illustrates a syntax of URL signaling description
according to another embodiment of the present invention;
[0125] FIG. 102 illustrates a SourceFlow element according to
another embodiment of the present invention;
[0126] FIG. 103 illustrates a process of acquiring signaling
information through a broadcast network according to another
embodiment of the present invention;
[0127] FIG. 104 illustrates a process of acquiring signaling
information through a broadcast network and a broadband network
according to another embodiment of the present invention;
[0128] FIG. 105 illustrates a process of acquiring signaling
information through a broadband network according to another
embodiment of the present invention;
[0129] FIG. 106 illustrates a process of acquiring an electronic
service guide (ESG) through a broadcast network according to
another embodiment of the present invention;
[0130] FIG. 107 illustrates a process of acquiring video segments
and audio segments of broadcast services through a broadcast
network according to another embodiment of the present
invention;
[0131] FIG. 108 illustrates a process of acquiring video segments
through a broadcast network and acquiring audio segments through a
broadband network according to another embodiment of the present
invention;
[0132] FIG. 109 illustrates a configuration of a
clock_reference_bootstrap_descriptor according to an embodiment of
the present invention;
[0133] FIG. 110 illustrates a configuration of a
clock_reference_value_descriptor according to an embodiment of the
present invention;
[0134] FIG. 111 illustrates a configuration of a fast information
channel (FIC) according to an embodiment of the present
invention;
[0135] FIG. 112 illustrates a configuration of an FIC according to
another embodiment of the present invention;
[0136] FIG. 113 illustrates a configuration of service description
according to an embodiment of the present invention;
[0137] FIG. 114 illustrates a configuration of component mapping
description according to an embodiment of the present
invention;
[0138] FIG. 115 illustrates a method of transmitting a broadcast
signal according to an embodiment of the present invention;
[0139] FIG. 116 illustrates a method of receiving a broadcast
signal according to an embodiment of the present invention;
[0140] FIG. 117 illustrates a configuration of an apparatus for
transmitting a broadcast signal according to an embodiment of the
present invention;
[0141] FIG. 118 illustrates a configuration of an apparatus for
receiving a broadcast signal according to an embodiment of the
present invention;
[0142] FIG. 119 illustrates service description information when
session description information is included in the service
description information and delivered according to an embodiment of
the present invention;
[0143] FIG. 120 illustrates message formats for delivering session
description information when the session description information is
delivered through a service signaling channel according to an
embodiment of the present invention;
[0144] FIG. 121 illustrates a method for transmitting session
description information through a path outside of a session
according to an embodiment of the present invention;
[0145] FIG. 122 illustrates a method for transmitting session
description information through a path outside of a session
according to another embodiment of the present invention;
[0146] FIG. 123 illustrates a method for transmitting session
description information through a path outside of a session
according to another embodiment of the present invention;
[0147] FIG. 124 illustrates ESG bootstrap information according to
an embodiment of the present invention;
[0148] FIG. 125 illustrates ESG bootstrap information transmission
type according to an embodiment of the present invention;
[0149] FIG. 126 illustrates ESG bootstrap information signaling
according to a first embodiment of the present invention;
[0150] FIG. 127 illustrates ESG bootstrap information signaling
according to a second embodiment of the present invention;
[0151] FIG. 128 illustrates ESG bootstrapping description signaling
according to a third embodiment of the present invention;
[0152] FIG. 129 illustrates ESG bootstrap information signaling
according to a fourth embodiment of the present invention;
[0153] FIG. 130 illustrates ESG bootstrap information signaling
according to a fifth embodiment of the present invention;
[0154] FIG. 131 illustrates a GAT according to the fifth embodiment
of the present invention;
[0155] FIG. 132 illustrates effects of the first to fifth
embodiments of the present invention; and
[0156] FIG. 133 is a flowchart illustrating operation of a
broadcast reception apparatus according to an embodiment of the
present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0157] Reference will now be made in detail to the preferred
embodiments of the present invention, examples of which are
illustrated in the accompanying drawings. The detailed description,
which will be given below with reference to the accompanying
drawings, is intended to explain exemplary embodiments of the
present invention, rather than to show the only embodiments that
can be implemented according to the present invention. The
following detailed description includes specific details in order
to provide a thorough understanding of the present invention.
However, it will be apparent to those skilled in the art that the
present invention may be practiced without such specific
details.
[0158] Although the terms used in the present invention are
selected from generally known and used terms, some of the terms
mentioned in the description of the present invention have been
selected by the applicant at his or her discretion, the detailed
meanings of which are described in relevant parts of the
description herein. Furthermore, it is required that the present
invention is understood, not simply by the actual terms used but by
the meanings of each term lying within.
[0159] The present invention provides apparatuses and methods for
transmitting and receiving broadcast signals for future broadcast
services. Future broadcast services according to an embodiment of
the present invention include a terrestrial broadcast service, a
mobile broadcast service, an ultra high definition television
(UHDTV) service, etc. The present invention may process broadcast
signals for the future broadcast services through non-MIMO
(Multiple Input Multiple Output) or MIMO according to one
embodiment. A non-MIMO scheme according to an embodiment of the
present invention may include a MISO (Multiple Input Single Output)
scheme, a SISO (Single Input Single Output) scheme, etc.
[0160] FIG. 1 illustrates a receiver protocol stack according to an
embodiment of the present invention.
[0161] Two schemes may be used in broadcast service delivery
through a broadcast network.
[0162] In a first scheme, media processing units (MPUs) are
transmitted using an MMT protocol (MMTP) based on MPEG media
transport (MMT). In a second scheme, dynamic adaptive streaming
over HTTP (DASH) segments may be transmitted using real time object
delivery over unidirectional transport (ROUTE) based on MPEG
DASH.
[0163] Non-timed content including NRT media, EPG data, and other
files is delivered with ROUTE. Signaling may be delivered over MMTP
and/or ROUTE, while bootstrap signaling information is provided by
the means of the Service List Table (SLT).
[0164] In hybrid service delivery, MPEG DASH over HTTP/TCP/IP is
used on the broadband side. Media files in ISO Base Media File
Format (BMFF) are used as the delivery, media encapsulation and
synchronization format for both broadcast and broadband delivery.
Here, hybrid service delivery may refer to a case in which one or
more program elements are delivered through a broadband path.
[0165] Services are delivered using three functional layers. These
are the Physical layer, the Delivery layer and the Service
Management layer. The Physical layer provides the mechanism by
which signaling, service announcement and IP packet streams are
transported over the Broadcast Physical layer and/or Broadband
Physical layer. The Delivery layer provides object and object flow
transport functionality. It is enabled by the MMTP or the ROUTE
protocol, operating on a UDP/IP multicast over the Broadcast
Physical layer, and enabled by the HTTP protocol on a TCP/IP
unicast over the Broadband Physical layer. The Service Management
layer enables any type of service, such as linear TV or HTML5
application service, to be carried by the underlying Delivery and
Physical layers.
[0166] In this figure, a protocol stack part on a broadcast side
may be divided into a part transmitted through the SLT and the
MMTP, and a part transmitted through ROUTE.
[0167] The SLT may be encapsulated through UDP and IP layers. Here,
the SLT will be described below. The MMTP may transmit data
formatted in an MPU format defined in MMT, and signaling
information according to the MMTP. The data may be encapsulated
through the UDP and IP layers. ROUTE may transmit data formatted in
a DASH segment form, signaling information, and non-timed data such
as NRT data, etc. The data may be encapsulated through the UDP and
IP layers. According to a given embodiment, some or all processing
according to the UDP and IP layers may be omitted. Here, the
illustrated signaling information may be signaling information
related to a service.
[0168] The part transmitted through the SLT and the MMTP and the
part transmitted through ROUTE may be processed in the UDP and IP
layers, and then encapsulated again in a data link layer. The link
layer will be described below. Broadcast data processed in the link
layer may be multicast as a broadcast signal through processes such
as encoding/interleaving, etc. in the physical layer.
[0169] In this figure, a protocol stack part on a broadband side
may be transmitted through HTTP as described above. Data formatted
in a DASH segment form, signaling information, NRT information,
etc. may be transmitted through HTTP. Here, the illustrated
signaling information may be signaling information related to a
service. The data may be processed through the TCP layer and the IP
layer, and then encapsulated into the link layer. According to a
given embodiment, some or all of the TCP, the IP, and the link
layer may be omitted. Broadband data processed thereafter may be
transmitted by unicast in the broadband through a process for
transmission in the physical layer.
[0170] Service can be a collection of media components presented to
the user in aggregate; components can be of multiple media types; a
service can be either continuous or intermittent; a service can be
Real Time or Non-Real Time; Real Time Service can consist of a
sequence of TV programs.
[0171] FIG. 2 illustrates a relation between the SLT and SLS
according to an embodiment of the present invention.
[0172] Service Signaling provides service discovery and description
information, and comprises two functional components: Bootstrap
signaling via the Service List Table (SLT) and the Service Layer
Signaling (SLS). These represent the information which is necessary
to discover and acquire user services. The SLT enables the receiver
to build a basic service list, and bootstrap the discovery of the
SLS for each service.
[0173] The SLT can enable very rapid acquisition of basic service
information. The SLS enables the receiver to discover and access
services and their content components. Details of the SLT and SLS
will be described below.
[0174] As described in the foregoing, the SLT may be transmitted
through UDP/IP. In this instance, according to a given embodiment,
data corresponding to the SLT may be delivered through the most
robust scheme in this transmission.
[0175] The SLT may have access information for accessing SLS
delivered by the ROUTE protocol. In other words, the SLT may be
bootstrapped into SLS according to the ROUTE protocol. The SLS is
signaling information positioned in an upper layer of ROUTE in the
above-described protocol stack, and may be delivered through
ROUTE/UDP/IP. The SLS may be transmitted through one of LCT
sessions included in a ROUTE session. It is possible to access a
service component corresponding to a desired service using the
SLS.
[0176] In addition, the SLT may have access information for
accessing an MMT signaling component delivered by MMTP. In other
words, the SLT may be bootstrapped into SLS according to the MMTP.
The SLS may be delivered by an MMTP signaling message defined in
MMT. It is possible to access a streaming service component (MPU)
corresponding to a desired service using the SLS. As described in
the foregoing, in the present invention, an NRT service component
is delivered through the ROUTE protocol, and the SLS according to
the MMTP may include information for accessing the ROUTE protocol.
In broadband delivery, the SLS is carried over HTTP(S)/TCP/IP.
[0177] FIG. 3 illustrates an SLT according to an embodiment of the
present invention.
[0178] First, a description will be given of a relation among
respective logical entities of service management, delivery, and a
physical layer.
[0179] Services may be signaled as being one of two basic types.
First type is a linear audio/video or audio-only service that may
have an app-based enhancement. Second type is a service whose
presentation and composition is controlled by a downloaded
application that is executed upon acquisition of the service. The
latter can be called an "app-based" service.
[0180] The rules regarding presence of ROUTE/LCT sessions and/or
MMTP sessions for carrying the content components of a service may
be as follows.
[0181] For a broadcast delivery of a linear service without
app-based enhancement, the service's content components can be
carried by either (but not both): (1) One or more ROUTE/LCT
sessions, or (2) One or more MMTP sessions.
[0182] For broadcast delivery of a linear service with app-based
enhancement, the service's content components can be carried by:
(1) One or more ROUTE/LCT sessions, and (2) Zero or more MMTP
sessions.
[0183] In certain embodiments, use of both MMTP and ROUTE for
streaming media components in the same service may not be
allowed.
[0184] For broadcast delivery of an App-based service, the
service's content components can be carried by one or more
ROUTE/LCT sessions.
[0185] Each ROUTE session comprises one or more LCT sessions which
carry as a whole, or in part, the content components that make up
the service. In streaming services delivery, an LCT session may
carry an individual component of a user service such as an audio,
video or closed caption stream. Streaming media is formatted as
DASH segments.
[0186] Each MMTP session comprises one or more MMTP packet flows
which carry MMT signaling messages or as a whole, or in part, the
content component. An MMTP packet flow may carry MMT signaling
messages or components formatted as MPUs.
[0187] For the delivery of NRT user services or system metadata, an
LCT session carries file-based content items. These content files
may consist of continuous (time-based) or discrete (non-time-based)
media components of an NRT service, or metadata such as Service
Signaling or ESG fragments. Delivery of system metadata such as
service signaling or ESG fragments may also be achieved through the
signaling message mode of MMTP.
[0188] A Broadcast Stream is the abstraction for an RF Channel,
which is defined in terms of a carrier frequency centered within a
specified bandwidth. It is identified by the pair [geographic area,
frequency]. A physical layer pipe (PLP) corresponds to a portion of
the RF channel. Each PLP has certain modulation and coding
parameters. It is identified by a PLP identifier (PLPID), which is
unique within the broadcast stream it belongs to. Here, PLP can be
referred to as DP (Data Pipe).
[0189] Each service is identified by two forms of service
identifier: a compact form that is used in the SLT and is unique
only within the broadcast area, and a globally unique form that is
used in the SLS and the ESG. A ROUTE session is identified by a
source IP address, destination IP address and destination port
number. An LCT session (associated with the service component(s) it
carries) is identified by a transport session identifier (TSI)
which is unique within the scope of the parent ROUTE session.
Properties common to the LCT sessions, and certain properties
unique to individual LCT sessions, are given in a ROUTE signaling
structure called a service-based transport session instance
description (S-TSID), which is part of the service layer signaling.
Each LCT session is carried over a single physical layer pipe.
According to a given embodiment, one LCT session may be transmitted
through a plurality of PLPs. Different LCT sessions of a ROUTE
session may or may not be contained in different physical layer
pipes. Here, the ROUTE session may be delivered through a plurality
of PLPs. The properties described in the S-TSID include the TSI
value and PLPID for each LCT session, descriptors for the delivery
objects/files, and application layer FEC parameters.
[0190] A MMTP Session is identified by destination IP Address and
destination port number. An MMTP packet flow (associated with the
service component(s) it carries) is identified by a packet_id which
is unique within the scope of the parent MMTP session. Properties
common to each MMTP packet flow, and certain properties of MMTP
packet flows, are given in the SLT. Properties for each MMTP
session are given by MMT signaling messages, which may be carried
within the MMTP session. Different MMTP packet flows of a MMTP
session may or may not be contained in different physical layer
pipes. Here, the MMTP session may be delivered through a plurality
of PLPs. The properties described in the MMT signaling messages
include the packet_id value and PLPID for each MMTP packet flow.
Here, the MMT signaling messages may have a form defined in MMT, or
have a deformed form according to embodiments to be described
below.
[0191] Hereinafter, a description will be given of low level
signaling (LLS).
[0192] Signaling information which is carried in the payload of IP
packets with a well-known address/port dedicated to this function
is referred to as Low Level Signaling (LLS). The IP address and the
port number may be differently configured depending on embodiments.
In one embodiment, LLS can be transported in IP packets with
address 224.0.23.60 and destination port 4937/udp. LLS may be
positioned in a portion expressed by "SLT" on the above-described
protocol stack. However, according to a given embodiment, the LLS
may be transmitted through a separate physical channel (dedicated
channel) in a signal frame without being subjected to processing of
the UDP/IP layer.
[0193] UDP/IP packets that deliver LLS data may be formatted in a
form referred to as an LLS table. A first byte of each UDP/IP
packet that delivers the LLS data may correspond to a start of the
LLS table. The maximum length of any LLS table is limited by the
largest IP packet that can be delivered from the PHY layer, 65,507
bytes.
[0194] The LLS table may include an LLS table ID field that
identifies a type of the LLS table, and an LLS table version field
that identifies a version of the LLS table. According to a value
indicated by the LLS table ID field, the LLS table may include the
above-described SLT or a rating region table (RRT). The RRT may
have information about content advisory rating.
[0195] Hereinafter, the SLT will be described. LLS can be signaling
information which supports rapid channel scans and bootstrapping of
service acquisition by the receiver, and SLT can be a table of
signaling information which is used to build a basic service
listing and provide bootstrap discovery of SLS.
[0196] The function of the SLT is similar to that of the program
association table (PAT) in MPEG-2 systems, and the fast information
channel (FIC) found in ATSC systems. For a receiver first
encountering the broadcast emission, this is the place to start.
SLT supports a rapid channel scan which allows a receiver to build
a list of all the services it can receive, with their channel name,
channel number, etc., and SLT provides bootstrap information that
allows a receiver to discover the SLS for each service. For
ROUTE/DASH-delivered services, the bootstrap information includes
the destination IP address and destination port of the LCT session
that carries the SLS. For MMT/MPU-delivered services, the bootstrap
information includes the destination IP address and destination
port of the MMTP session carrying the SLS.
[0197] The SLT supports rapid channel scans and service acquisition
by including the following information about each service in the
broadcast stream. First, the SLT can include information necessary
to allow the presentation of a service list that is meaningful to
viewers and that can support initial service selection via channel
number or up/down selection. Seconds, the SLT can include
information necessary to locate the service layer signaling for
each service listed. That is, the SLT may include access
information related to a location at which the SLS is
delivered.
[0198] The illustrated SLT according to the present embodiment is
expressed as an XML document having an SLT root element. According
to a given embodiment, the SLT may be expressed in a binary format
or an XML document.
[0199] The SLT root element of the SLT illustrated in the figure
may include @bsid, @sltSectionVersion, @sltSectionNumber,
@totalSltSectionNumbers, @language, @capabilities, InetSigLoc
and/or Service. According to a given embodiment, the SLT root
element may further include @providerId. According to a given
embodiment, the SLT root element may not include @language.
[0200] The service element may include @serviceId,
@SLTserviceSeqNumber, @protected, @majorChannelNo, @minorChannelNo,
@serviceCategory, @shortServiceName, @hidden, @slsProtocolType,
BroadcastSignaling, @slsPlpId, @slsDestinationIpAddress,
@slsDestinationUdpPort, @slsSourceIpAddress,
@slsMajorProtocolVersion, @SlsMinorProtocolVersion,
@serviceLanguage, @broadbandAccessRequired, @capabilities and/or
InetSigLoc.
[0201] According to a given embodiment, an attribute or an element
of the SLT may be added/changed/deleted. Each element included in
the SLT may additionally have a separate attribute or element, and
some attribute or elements according to the present embodiment may
be omitted. Here, a field which is marked with @ may correspond to
an attribute, and a field which is not marked with @ may correspond
to an element.
[0202] @bsid is an identifier of the whole broadcast stream. The
value of BSID may be unique on a regional level.
[0203] @providerId can be an index of broadcaster that is using
part or all of this broadcast stream. This is an optional
attribute. When it is not present, it means that this broadcast
stream is being used by one broadcaster. @providerId is not
illustrated in the figure.
[0204] @sltSectionVersion can be aversion number of the SLT
section. The sltSectionVersion can be incremented by 1 when a
change in the information carried within the slt occurs. When it
reaches maximum value, it wraps around to 0.
[0205] @sltSectionNumber can be the number, counting from 1, of
this section of the SLT. In other words, @sltSectionNumber may
correspond to a section number of the SLT section. When this field
is not used, @sltSectionNumber may be set to a default value of
1.
[0206] @totalSltSectionNumbers can be the total number of sections
(that is, the section with the highest sltSectionNumber) of the SLT
of which this section is part. sltSectionNumber and
totalSltSectionNumbers together can be considered to indicate "Part
M of N" of one portion of the SLT when it is sent in fragments. In
other words, when the SLT is transmitted, transmission through
fragmentation may be supported. When this field is not used,
@totalSltSectionNumbers may be set to a default value of 1. A case
in which this field is not used may correspond to a case in which
the SLT is not transmitted by being fragmented.
[0207] @language can indicate primary language of the services
included in this slt instance. According to a given embodiment, a
value of this field may have be a three-character language code
defined in the ISO. This field may be omitted.
[0208] @capabilities can indicate required capabilities for
decoding and meaningfully presenting the content for all the
services in this slt instance.
[0209] InetSigLoc can provide a URL telling the receiver where it
can acquire any requested type of data from external server(s) via
broadband. This element may include @urlType as a lower field.
According to a value of the @urlType field, a type of a URL
provided by InetSigLoc may be indicated. According to a given
embodiment, when the @urlType field has a value of 0, InetSigLoc
may provide a URL of a signaling server. When the @urlType field
has a value of 1, InetSigLoc may provide a URL of an ESG server.
When the @urlType field has other values, the field may be reserved
for future use.
[0210] The service field is an element having information about
each service, and may correspond to a service entry. Service
element fields corresponding to the number of services indicated by
the SLT may be present. Hereinafter, a description will be given of
a lower attribute/element of the service field.
[0211] @serviceId can be an integer number that uniquely identify
this service within the scope of this broadcast area. According to
a given embodiment, a scope of @serviceId may be changed.
@SLTserviceSeqNumber can be an integer number that indicates the
sequence number of the SLT service information with service ID
equal to the serviceId attribute above. SLTserviceSeqNumber value
can start at 0 for each service and can be incremented by 1 every
time any attribute in this service element is changed. If no
attribute values are changed compared to the previous service
element with a particular value of ServiceID then
SLTserviceSeqNumber would not be incremented. The
SLTserviceSeqNumber field wraps back to 0 after reaching the
maximum value.
[0212] @protected is flag information which may indicate whether
one or more components for significant reproduction of the service
are in a protected state. When set to "1" (true), that one or more
components necessary for meaningful presentation is protected. When
set to "0" (false), this flag indicates that no components
necessary for meaningful presentation of the service are protected.
Default value is false.
[0213] @majorChannelNo is an integer number representing the
"major" channel number of the service. An example of the field may
have a range of 1 to 999.
[0214] @minorChannelNo is an integer number representing the
"minor" channel number of the service. An example of the field may
have a range of 1 to 999.
[0215] @serviceCategory can indicate the category of this service.
This field may indicate a type that varies depending on
embodiments. According to a given embodiment, when this field has
values of 1, 2, and 3, the values may correspond to a linear A/V
service, a linear audio only service, and an app-based service,
respectively. When this field has a value of 0, the value may
correspond to a service of an undefined category. When this field
has other values except for 1, 2, and 3, the field may be reserved
for future use. @shortServiceName can be a short string name of the
service.
[0216] @hidden can be boolean value that when present and set to
"true" indicates that the service is intended for testing or
proprietary use, and is not to be selected by ordinary TV
receivers. The default value is "false" when not present.
[0217] @slsProtocolType can be an attribute indicating the type of
protocol of service layer signaling used by this service. This
field may indicate a type that varies depending on embodiments.
According to a given embodiment, when this field has values of 1
and 2, protocols of SLS used by respective corresponding services
may be ROUTE and MMTP, respectively. When this field has other
values except for 0, the field may be reserved for future use. This
field may be referred to as @slsProtocol.
[0218] BroadcastSignaling and lower attributes/elements thereof may
provide information related to broadcast signaling. When the
BroadcastSignaling element is not present, the child element
InetSigLoc of the parent service element can be present and its
attribute urlType includes URL_type 0x00 (URL to signaling server).
In this case attribute url supports the query parameter
svc=<service_id> where service_id corresponds to the
serviceId attribute for the parent Service element.
[0219] Alternatively, when the BroadcastSignaling element is not
present, the element InetSigLoc can be present as a child element
of the slt root element and the attribute urlType of that
InetSigLoc element includes URL_type 0x00 (URL to signaling
server). In this case attribute url for URL_type 0x00 supports the
query parameter svc=<service_id> where service_id corresponds
to the serviceId attribute for the parent Service element.
[0220] @slsPlpId can be a string representing an integer number
indicating the PLP ID of the physical layer pipe carrying the SLS
for this service.
[0221] @slsDestinationIpAddress can be a string containing the
dotted-IPv4 destination address of the packets carrying SLS data
for this service.
[0222] @slsDestinationUdpPort can be a string containing the port
number of the packets carrying SLS data for this service. As
described in the foregoing, SLS bootstrapping may be performed by
destination IP/UDP information.
[0223] @slsSourceIpAddress can be a string containing the
dotted-IPv4 source address of the packets carrying SLS data for
this service.
[0224] @slsMajorProtocolVersion can be major version number of the
protocol used to deliver the service layer signaling for this
service. Default value is 1.
[0225] @SlsMinorProtocolVersion can be minor version number of the
protocol used to deliver the service layer signaling for this
service. Default value is 0.
[0226] @serviceLanguage can be a three-character language code
indicating the primary language of the service. A value of this
field may have a form that varies depending on embodiments.
[0227] @broadbandAccessRequired can be a Boolean indicating that
broadband access is required for a receiver to make a meaningful
presentation of the service. Default value is false. When this
field has a value of True, the receiver needs to access a broadband
for significant service reproduction, which may correspond to a
case of hybrid service delivery.
[0228] @capabilities can represent required capabilities for
decoding and meaningfully presenting the content for the service
with service ID equal to the serviceId attribute above.
[0229] InetSigLoc can provide a URL for access to signaling or
announcement information via broadband, if available. Its datatype
can be an extension of the anyURL datatype, adding an @urlType
attribute that indicates what the URL gives access to. An @urlType
field of this field may indicate the same meaning as that of the
@urlType field of InetSigLoc described above. When an InetSigLoc
element of attribute URL_type 0x00 is present as an element of the
SLT, it can be used to make HTTP requests for signaling metadata.
The HTTP POST message body may include a service term. When the
InetSigLoc element appears at the section level, the service term
is used to indicate the service to which the requested signaling
metadata objects apply. If the service term is not present, then
the signaling metadata objects for all services in the section are
requested. When the InetSigLoc appears at the service level, then
no service term is needed to designate the desired service. When an
InetSigLoc element of attribute URL_type 0x01 is provided, it can
be used to retrieve ESG data via broadband. If the element appears
as a child element of the service element, then the URL can be used
to retrieve ESG data for that service. If the element appears as a
child element of the SLT element, then the URL can be used to
retrieve ESG data for all services in that section.
[0230] In another example of the SLT, @sltSectionVersion,
@sltSectionNumber, @totalSltSectionNumbers and/or @language fields
of the SLT may be omitted.
[0231] In addition, the above-described InetSigLoc field may be
replaced by @sltInetSigUri and/or @sltInetEsgUri field. The two
fields may include the URI of the signaling server and URI
information of the ESG server, respectively. The InetSigLoc field
corresponding to a lower field of the SLT and the InetSigLoc field
corresponding to a lower field of the service field may be replaced
in a similar manner.
[0232] The suggested default values may vary depending on
embodiments. An illustrated "use" column relates to the respective
fields. Here, "1" may indicate that a corresponding field is an
essential field, and "0 . . . 1" may indicate that a corresponding
field is an optional field.
[0233] FIG. 4 illustrates SLS bootstrapping and a service discovery
process according to an embodiment of the present invention.
[0234] Hereinafter, SLS will be described.
[0235] SLS can be signaling which provides information for
discovery and acquisition of services and their content
components.
[0236] For ROUTE/DASH, the SLS for each service describes
characteristics of the service, such as a list of its components
and where to acquire them, and the receiver capabilities required
to make a meaningful presentation of the service. In the ROUTE/DASH
system, the SLS includes the User Service Bundle Description
(USBD), the S-TSID and the DASH Media Presentation Description
(MPD). Here, USBD or user service description (USD) is one of SLS
XML fragments, and may function as a signaling herb that describes
specific descriptive information. USBD/USD may be extended beyond
3GPP MBMS. Details of USBD/USD will be described below.
[0237] The Service Signaling focuses on basic attributes of the
service itself, especially those attributes needed to acquire the
service. Properties of the service and programming that are
intended for viewers appear as Service Announcement, or ESG
data.
[0238] Having separate Service Signaling for each service permits a
receiver to acquire the appropriate SLS for a service of interest
without the need to parse the entire SLS carried within a Broadcast
Stream.
[0239] For optional broadband delivery of Service Signaling, the
SLT can include HTTP URLs where the Service Signaling files can be
obtained, as described above.
[0240] LLS is used for bootstrapping SLS acquisition, and
subsequently, the SLS is used to acquire service components
delivered on either ROUTE sessions or MMTP sessions. The described
figure illustrates the following signaling sequences. Receiver
starts acquiring the SLT described above. Each service identified
by service id delivered over ROUTE sessions provides SLS
bootstrapping information: PLPID(#1), source IP address (sIP1),
destination IP address (dIP1), and destination port number
(dPort1). Each service identified by service_id delivered over MMTP
sessions provides SLS bootstrapping information: PLPID(#2),
destination IP address (dIP2), and destination port number
(dPort2).
[0241] For streaming services delivery using ROUTE, the receiver
can acquire SLS fragments carried over the IP/UDP/LCT session and
PLP; whereas for streaming services delivery using MMTP, the
receiver can acquire SLS fragments carried over an MMTP session and
PLP. For service delivery using ROUTE, these SLS fragments include
USBD/USD fragments, S-TSID fragments, and MPD fragments. They are
relevant to one service. USBD/USD fragments describe service layer
properties and provide URI references to S-TSID fragments and URI
references to MPD fragments. In other words, the USBD/USD may refer
to S-TSID and MPD. For service delivery using MMTP, the USBD
references the MMT Signaling's MPT Message, the MP Table of which
provides identification of Package ID and location information for
assets belonging to the service. Here, an asset is a multimedia
data entity, and may refer to a data entity which is combined into
one unique ID and is used to generate one multimedia presentation.
The asset may correspond to a service component included in one
service. The MPT message is a message having the MP table of MMT.
Here, the MP table may be an MMT package table having information
about content and an MMT asset. Details may be similar to a
definition in MMT. Here, media presentation may correspond to a
collection of data that establishes bounded/unbounded presentation
of media content.
[0242] The S-TSID fragment provides component acquisition
information associated with one service and mapping between DASH
Representations found in the MPD and in the TSI corresponding to
the component of the service. The S-TSID can provide component
acquisition information in the form of a TSI and the associated
DASH Representation identifier, and PLPID carrying DASH Segments
associated with the DASH Representation. By the PLPID and TSI
values, the receiver collects the audio/video components from the
service and begins buffering DASH Media Segments then applies the
appropriate decoding processes.
[0243] For USBD listing service components delivered on MMTP
sessions, as illustrated by "Service #2" in the described figure,
the receiver also acquires an MPT message with matching
MMT_package_id to complete the SLS. An MPT message provides the
full list of service components comprising a service and the
acquisition information for each component. Component acquisition
information includes MMTP session information, the PLPID carrying
the session and the packet_id within that session.
[0244] According to a given embodiment, for example, in ROUTE, two
or more S-TSID fragments may be used. Each fragment may provide
access information related to LCT sessions delivering content of
each service.
[0245] In ROUTE, S-TSID, USBD/USD, MPD, or an LCT session
delivering S-TSID, USBD/USD or MPD may be referred to as a service
signaling channel. In MMTP, USBD/UD, an MMT signaling message, or a
packet flow delivering the MMTP or USBD/UD may be referred to as a
service signaling channel.
[0246] Unlike the illustrated example, one ROUTE or MMTP session
may be delivered through a plurality of PLPs. In other words, one
service may be delivered through one or more PLPs. As described in
the foregoing, one LCT session may be delivered through one PLP.
Unlike the figure, according to a given embodiment, components
included in one service may be delivered through different ROUTE
sessions. In addition, according to a given embodiment, components
included in one service may be delivered through different MMTP
sessions. According to a given embodiment, components included in
one service may be delivered separately through a ROUTE session and
an MMTP session. Although not illustrated, components included in
one service may be delivered via broadband (hybrid delivery).
[0247] FIG. 5 illustrates a USBD fragment for ROUTE/DASH according
to an embodiment of the present invention.
[0248] Hereinafter, a description will be given of SLS in delivery
based on ROUTE.
[0249] Service Layer Signaling provides detailed technical
information to the receiver to enable the discovery and access of
services and their content components. It can include a set of
XML-encoded metadata fragments carried over a dedicated LCT
session. That LCT session can be acquired using the bootstrap
information contained in the SLT as described above. The SLS is
defined on a per-service level, and it describes the
characteristics and access information of the service, such as a
list of its content components and how to acquire them, and the
receiver capabilities required to make a meaningful presentation of
the service. In the ROUTE/DASH system, for linear services
delivery, the SLS consists of the following metadata fragments:
USBD, S-TSID and the DASH MPD. The SLS fragments can be delivered
on a dedicated LCT transport session with TSI=0. According to a
given embodiment, a TSI of a particular LCT session (dedicated LCT
session) in which an SLS fragment is delivered may have a different
value. According to a given embodiment, an LCT session in which an
SLS fragment is delivered may be signaled using the SLT or another
scheme.
[0250] ROUTE/DASH Service Layer Signaling can include the User
Service Bundle Description (USBD) and Service-based Transport
Session Instance Description (S-TSID) metadata fragments. These
service signaling fragments are applicable to both linear and
application-based services. The USBD fragment contains service
identification, device capabilities information, references to
other SLS fragments required to access the service and constituent
media components, and metadata to enable the receiver to determine
the transport mode (broadcast and/or broadband) of service
components. The S-TSID fragment, referenced by the USBD, provides
transport session descriptions for the one or more ROUTE/LCT
sessions in which the media content components of a service are
delivered, and descriptions of the delivery objects carried in
those LCT sessions. The USBD and S-TSID will be described
below.
[0251] In streaming content signaling in ROUTE-based delivery, a
streaming content signaling component of SLS corresponds to an MPD
fragment. The MPD is typically associated with linear services for
the delivery of DASH Segments as streaming content. The MPD
provides the resource identifiers for individual media components
of the linear/streaming service in the form of Segment URLs, and
the context of the identified resources within the Media
Presentation. Details of the MPD will be described below.
[0252] In app-based enhancement signaling in ROUTE-based delivery,
app-based enhancement signaling pertains to the delivery of
app-based enhancement components, such as an application logic
file, locally-cached media files, an network content items, or a
notification stream. An application can also retrieve
locally-cached data over a broadband connection when available.
[0253] Hereinafter, a description will be given of details of
USBD/USD illustrated in the figure.
[0254] The top level or entry point SLS fragment is the USBD
fragment. An illustrated USBD fragment is an example of the present
invention, basic fields of the USBD fragment not illustrated in the
figure may be additionally provided according to a given
embodiment. As described in the foregoing, the illustrated USBD
fragment has an extended form, and may have fields added to a basic
configuration.
[0255] The illustrated USBD may have a bundleDescription root
element. The bundleDescription root element may have a
userServiceDescription element. The userServiceDescription element
may correspond to an instance for one service.
[0256] The userServiceDescription element may include @serviceId,
@atsc:serviceId, @atsc:serviceStatus, @atsc:fullMPDUri,
@atsc:sTSIDUri, name, serviceLanguage, atsc:capabilityCode and/or
deliveryMethod.
[0257] @serviceId can be a globally unique URI that identifies a
service, unique within the scope of the BSID. This parameter can be
used to link to ESG data (Service@globalServiceID).
[0258] @atsc:serviceId is a reference to corresponding service
entry in LLS(SLT). The value of this attribute is the same value of
serviceId assigned to the entry.
[0259] @atsc:serviceStatus can specify the status of this service.
The value indicates whether this service is active or inactive.
When set to "1" (true), that indicates service is active. When this
field is not used, @atsc:serviceStatus may be set to a default
value of 1.
[0260] @atsc:fullMPDUri can reference an MPD fragment which
contains descriptions for contents components of the service
delivered over broadcast and optionally, also over broadband.
[0261] @atsc:sTSIDUri can reference the S-TSID fragment which
provides access related parameters to the Transport sessions
carrying contents of this service.
[0262] name can indicate name of the service as given by the lang
attribute. name element can include lang attribute, which
indicating language of the service name. The language can be
specified according to XML datatypes.
[0263] serviceLanguage can represent available languages of the
service. The language can be specified according to XML data
types.
[0264] atsc:capabilityCode can specify the capabilities required in
the receiver to be able to create a meaningful presentation of the
content of this service. According to a given embodiment, this
field may specify a predefined capability group. Here, the
capability group may be a group of capability attribute values for
significant presentation. This field may be omitted according to a
given embodiment.
[0265] deliveryMethod can be a container of transport related
information pertaining to the contents of the service over
broadcast and (optionally) broadband modes of access. Referring to
data included in the service, when the number of the data is N,
delivery schemes for respective data may be described by this
element. The deliveryMethod may include an r12:broadcastAppService
element and an r12:unicastAppService element. Each lower element
may include a basePattern element as a lower element.
[0266] r12:broadcastAppService can be a DASH Representation
delivered over broadcast, in multiplexed or non-multiplexed form,
containing the corresponding media component(s) belonging to the
service, across all Periods of the affiliated Media Presentation.
In other words, each of the fields may indicate DASH representation
delivered through the broadcast network.
[0267] r12:unicastAppService can be a DASH Representation delivered
over broadband, in multiplexed or non-multiplexed form, containing
the constituent media content component(s) belonging to the
service, across all Periods of the affiliated Media Presentation.
In other words, each of the fields may indicate DASH representation
delivered via broadband.
[0268] basePattern can be a character pattern for use by the
receiver to match against any portion of the Segment URL used by
the DASH client to request Media Segments of a parent
Representation under its containing Period. A match implies that
the corresponding requested Media Segment is carried over broadcast
transport. In a URL address for receiving DASH representation
expressed by each of the r12:broadcastAppService element and the
r12:unicastAppService element, a part of the URL, etc. may have a
particular pattern. The pattern may be described by this field.
Some data may be distinguished using this information. The proposed
default values may vary depending on embodiments. The "use" column
illustrated in the figure relates to each field. Here, M may denote
an essential field, O may denote an optional field, OD may denote
an optional field having a default value, and CM may denote a
conditional essential field. 0 . . . 1 to 0 . . . N may indicate
the number of available fields.
[0269] FIG. 6 illustrates an S-TSID fragment for ROUTE/DASH
according to an embodiment of the present invention.
[0270] Hereinafter, a description will be given of the S-TSID
illustrated in the figure in detail.
[0271] S-TSID can be an SLS XML fragment which provides the overall
session description information for transport session(s) which
carry the content components of a service. The S-TSID is the SLS
metadata fragment that contains the overall transport session
description information for the zero or more ROUTE sessions and
constituent LCT sessions in which the media content components of a
service are delivered. The S-TSID also includes file metadata for
the delivery object or object flow carried in the LCT sessions of
the service, as well as additional information on the payload
formats and content components carried in those LCT sessions.
[0272] Each instance of the S-TSID fragment is referenced in the
USBD fragment by the @atsc:sTSIDUri attribute of the
userServiceDescription element. The illustrated S-TSID according to
the present embodiment is expressed as an XML document. According
to a given embodiment, the S-TSID may be expressed in a binary
format or as an XML document.
[0273] The illustrated S-TSID may have an S-TSID root element. The
S-TSID root element may include @serviceId and/or RS.
[0274] @serviceID can be a reference corresponding service element
in the USD. The value of this attribute can reference a service
with a corresponding value of service_id.
[0275] The RS element may have information about a ROUTE session
for delivering the service data. Service data or service components
may be delivered through a plurality of ROUTE sessions, and thus
the number of RS elements may be 1 to N.
[0276] The RS element may include @bsid, @sIpAddr, @dIpAddr,
@dport, @PLPID and/or LS.
[0277] @bsid can be an identifier of the Broadcast Stream within
which the content component(s) of the broadcastAppService are
carried. When this attribute is absent, the default Broadcast
Stream is the one whose PLPs carry SLS fragments for this service.
Its value can be identical to that of the broadcast_stream_id in
the SLT.
[0278] @sIpAddr can indicate source IP address. Here, the source IP
address may be a source IP address of a ROUTE session for
delivering a service component included in the service. As
described in the foregoing, service components of one service may
be delivered through a plurality of ROUTE sessions. Thus, the
service components may be transmitted using another ROUTE session
other than the ROUTE session for delivering the S-TSID. Therefore,
this field may be used to indicate the source IP address of the
ROUTE session. A default value of this field may be a source IP
address of a current ROUTE session. When a service component is
delivered through another ROUTE session, and thus the ROUTE session
needs to be indicated, a value of this field may be a value of a
source IP address of the ROUTE session. In this case, this field
may correspond to M, that is, an essential field.
[0279] @dIpAddr can indicate destination IP address. Here, a
destination IP address may be a destination IP address of a ROUTE
session that delivers a service component included in a service.
For a similar case to the above description of @sIpAddr, this field
may indicate a destination IP address of a ROUTE session that
delivers a service component. A default value of this field may be
a destination IP address of a current ROUTE session. When a service
component is delivered through another ROUTE session, and thus the
ROUTE session needs to be indicated, a value of this field may be a
value of a destination IP address of the ROUTE session. In this
case, this field may correspond to M, that is, an essential
field.
[0280] @dport can indicate destination port. Here, a destination
port may be a destination port of a ROUTE session that delivers a
service component included in a service. For a similar case to the
above description of @sIpAddr, this field may indicate a
destination port of a ROUTE session that delivers a service
component. A default value of this field may be a destination port
number of a current ROUTE session. When a service component is
delivered through another ROUTE session, and thus the ROUTE session
needs to be indicated, a value of this field may be a destination
port number value of the ROUTE session. In this case, this field
may correspond to M, that is, an essential field.
[0281] @PLPID may be an ID of a PLP for a ROUTE session expressed
by an RS. A default value may be an ID of a PLP of an LCT session
including a current S-TSID. According to a given embodiment, this
field may have an ID value of a PLP for an LCT session for
delivering an S-TSID in the ROUTE session, and may have ID values
of all PLPs for the ROUTE session.
[0282] An LS element may have information about an LCT session for
delivering a service data. Service data or service components may
be delivered through a plurality of LCT sessions, and thus the
number of LS elements may be 1 to N.
[0283] The LS element may include @tsi, @PLPID, @bw, @startTime,
@endTime, SrcFlow and/or RprFlow.
[0284] @tsi may indicate a TSI value of an LCT session for
delivering a service component of a service.
[0285] @PLPID may have ID information of a PLP for the LCT session.
This value may be overwritten on a basic ROUTE session value.
[0286] @bw may indicate a maximum bandwidth value. @startTime may
indicate a start time of the LCT session. @endTime may indicate an
end time of the LCT session. A SrcFlow element may describe a
source flow of ROUTE. A RprFlow element may describe a repair flow
of ROUTE.
[0287] The proposed default values may be varied according to an
embodiment. The "use" column illustrated in the figure relates to
each field. Here, M may denote an essential field, O may denote an
optional field, OD may denote an optional field having a default
value, and CM may denote a conditional essential field. 0 . . . 1
to 0 . . . N may indicate the number of available fields.
[0288] Hereinafter, a description will be given of MPD for
ROUTE/DASH.
[0289] The MPD is an SLS metadata fragment which contains a
formalized description of a DASH Media Presentation, corresponding
to a linear service of a given duration defined by the broadcaster
(for example a single TV program, or the set of contiguous linear
TV programs over a period of time). The contents of the MPD provide
the resource identifiers for Segments and the context for the
identified resources within the Media Presentation. The data
structure and semantics of the MPD fragment can be according to the
MPD defined by MPEG DASH.
[0290] One or more of the DASH Representations conveyed in the MPD
can be carried over broadcast. The MPD may describe additional
Representations delivered over broadband, e.g. in the case of a
hybrid service, or to support service continuity in handoff from
broadcast to broadcast due to broadcast signal degradation (e.g.
driving through a tunnel).
[0291] FIG. 7 illustrates a USBD/USD fragment for MMT according to
an embodiment of the present invention.
[0292] MMT Service Layer Signaling for linear services comprise the
USBD fragment and the MMT Package (MP) table. The MP table is as
described above. The USBD fragment contains service identification,
device capabilities information, references to other SLS
information required to access the service and constituent media
components, and the metadata to enable the receiver to determine
the transport mode (broadcast and/or broadband) of the service
components. The MP table for MPU components, referenced by the
USBD, provides transport session descriptions for the MMTP sessions
in which the media content components of a service are delivered
and the descriptions of the Assets carried in those MMTP
sessions.
[0293] The streaming content signaling component of the SLS for MPU
components corresponds to the MP table defined in MMT. The MP table
provides a list of MMT Assets where each Asset corresponds to a
single service component and the description of the location
information for this component.
[0294] USBD fragments may also contain references to the S-TSID and
the MPD as described above, for service components delivered by the
ROUTE protocol and the broadband, respectively. According to a
given embodiment, in delivery through MMT, a service component
delivered through the ROUTE protocol is NRT data, etc. Thus, in
this case, MPD may be unnecessary. In addition, in delivery through
MMT, information about an LCT session for delivering a service
component, which is delivered via broadband, is unnecessary, and
thus an S-TSID may be unnecessary. Here, an MMT package may be a
logical collection of media data delivered using MMT. Here, an MMTP
packet may refer to a formatted unit of media data delivered using
MMT. An MPU may refer to a generic container of independently
decodable timed/non-timed data. Here, data in the MPU is media
codec agnostic.
[0295] Hereinafter, a description will be given of details of the
USBD/USD illustrated in the figure.
[0296] The illustrated USBD fragment is an example of the present
invention, and basic fields of the USBD fragment may be
additionally provided according to an embodiment. As described in
the foregoing, the illustrated USBD fragment has an extended form,
and may have fields added to a basic structure.
[0297] The illustrated USBD according to an embodiment of the
present invention is expressed as an XML document. According to a
given embodiment, the USBD may be expressed in a binary format or
as an XML document.
[0298] The illustrated USBD may have a bundleDescription root
element. The bundleDescription root element may have a
userServiceDescription element. The userServiceDescription element
may be an instance for one service.
[0299] The userServiceDescription element may include @serviceId,
@atsc:serviceId, name, serviceLanguage, atsc:capabilityCode,
atsc:Channel, atsc:mpuComponent, atsc:routeComponent,
atsc:broadbandComponent and/or atsc:ComponentInfo.
[0300] Here, @serviceId, @atsc:serviceId, name, serviceLanguage,
and atsc:capabilityCode may be as described above. The lang field
below the name field may be as described above. atsc:capabilityCode
may be omitted according to a given embodiment.
[0301] The userServiceDescription element may further include an
atsc:contentAdvisoryRating element according to an embodiment. This
element may be an optional element. atsc:contentAdvisoryRating can
specify the content advisory rating. This field is not illustrated
in the figure.
[0302] atsc:Channel may have information about a channel of a
service. The atsc:Channel element may include @atsc:majorChannelNo,
@atsc:minorChannelNo, @atsc:serviceLang, @atsc:serviceGenre,
@atsc:serviceIcon and/or atsc:ServiceDescription.
@atsc:majorChannelNo, @atsc:minorChannelNo, and @atsc:serviceLang
may be omitted according to a given embodiment.
[0303] @atsc:majorChannelNo is an attribute that indicates the
major channel number of the service.
[0304] @atsc:minorChannelNo is an attribute that indicates the
minor channel number of the service.
[0305] @atsc:serviceLang is an attribute that indicates the primary
language used in the service.
[0306] @atsc:serviceGenre is an attribute that indicates primary
genre of the service.
[0307] @atsc:serviceIcon is an attribute that indicates the Uniform
Resource Locator (URL) for the icon used to represent this
service.
[0308] atsc:ServiceDescription includes service description,
possibly in multiple languages. atsc:ServiceDescription includes
can include @atsc:serviceDescrText and/or
@atsc:serviceDescrLang.
[0309] @atsc:serviceDescrText is an attribute that indicates
description of the service.
[0310] @atsc:serviceDescrLang is an attribute that indicates the
language of the serviceDescrText attribute above.
[0311] atsc:mpuComponent may have information about a content
component of a service delivered in a form of an MPU.
atsc:mpuComponent may include @atsc:mmtPackageId and/or
@atsc:nextMmtPackageId.
[0312] @atsc:mmtPackageId can reference a MMT Package for content
components of the service delivered as MPUs.
[0313] @atsc:nextMmtPackageId can reference a MMT Package to be
used after the one referenced by @atsc:mmtPackageId in time for
content components of the service delivered as MPUs.
[0314] atsc:routeComponent may have information about a content
component of a service delivered through ROUTE. atsc:routeComponent
may include @atsc:sTSIDUri, @sTSIDPlpId,
@sTSIDDestinationIpAddress, @sTSIDDestinationUdpPort,
@sTSIDSourceIpAddress, @sTSIDMajorProtocolVersion and/or
@sTSIDMinorProtocolVersion.
[0315] @atsc:sTSIDUri can be a reference to the S-TSID fragment
which provides access related parameters to the Transport sessions
carrying contents of this service. This field may be the same as a
URI for referring to an S-TSID in USBD for ROUTE described above.
As described in the foregoing, in service delivery by the MMTP,
service components, which are delivered through NRT, etc., may be
delivered by ROUTE. This field may be used to refer to the S-TSID
therefor.
[0316] @sTSIDPlpId can be a string representing an integer number
indicating the PLP ID of the physical layer pipe carrying the
S-TSID for this service. (default: current physical layer
pipe).
[0317] @sTSIDDestinationIpAddress can be a string containing the
dotted-IPv4 destination address of the packets carrying S-TSID for
this service. (default: current MMTP session's source IP
address).
[0318] @sTSIDDestinationUdpPort can be a string containing the port
number of the packets carrying S-TSID for this service.
[0319] @sTSIDSourceIpAddress can be a string containing the
dotted-IPv4 source address of the packets carrying S-TSID for this
service.
[0320] @sTSIDMajorProtocolVersion can indicate major version number
of the protocol used to deliver the S-TSID for this service.
Default value is 1.
[0321] @sTSIDMinorProtocolVersion can indicate minor version number
of the protocol used to deliver the S-TSID for this service.
Default value is 0.
[0322] atsc:broadbandComponent may have information about a content
component of a service delivered via broadband. In other words,
atsc:broadbandComponent may be a field on the assumption of hybrid
delivery. atsc:broadbandComponent may further include
@atsc:fullfMPDUri.
[0323] @atsc:fullfMPDUri can be a reference to an MPD fragment
which contains descriptions for contents components of the service
delivered over broadband.
[0324] An atsc:ComponentInfo field may have information about an
available component of a service. The atsc:ComponentInfo field may
have information about a type, a role, a name, etc. of each
component. The number of atsc:ComponentInfo fields may correspond
to the number (N) of respective components. The atsc:ComponentInfo
field may include @atsc:componentType, @atsc:componentRole,
@atsc:componentProtectedFlag, @atsc:componentId and/or
@atsc:componentName.
[0325] @atsc:componentType is an attribute that indicates the type
of this component. Value of 0 indicates an audio component. Value
of 1 indicates a video component. Value of 2 indicated a closed
caption component. Value of 3 indicates an application component.
Values 4 to 7 are reserved. A meaning of a value of this field may
be differently set depending on embodiments.
[0326] @atsc:componentRole is an attribute that indicates the role
or kind of this component.
[0327] For audio (when componentType attribute above is equal to
0): values of componentRole attribute are as follows: 0=Complete
main, 1=Music and Effects, 2=Dialog, 3=Commentary, 4=Visually
Impaired, 5=Hearing Impaired, 6=Voice-Over, 7-254=reserved,
255=unknown.
[0328] For Video (when componentType attribute above is equal to 1)
values of componentRole attribute are as follows: 0=Primary video,
1=Alternative camera view, 2=Other alternative video component,
3=Sign language inset, 4=Follow subject video, 5=3D video left
view, 6=3D video right view, 7=3D video depth information, 8=Part
of video array <x,y> of <n,m>, 9=Follow-Subject
metadata, 10-254=reserved, 255=unknown.
[0329] For Closed Caption component (when componentType attribute
above is equal to 2) values of componentRole attribute are as
follows: 0=Normal, 1=Easy reader, 2-254=reserved, 255=unknown.
[0330] When componentType attribute above is between 3 to 7,
inclusive, the componentRole can be equal to 255. A meaning of a
value of this field may be differently set depending on
embodiments.
[0331] @atsc:componentProtectedFlag is an attribute that indicates
if this component is protected (e.g. encrypted). When this flag is
set to a value of 1 this component is protected (e.g. encrypted).
When this flag is set to a value of 0 this component is not
protected (e.g. encrypted). When not present the value of
componentProtectedFlag attribute is inferred to be equal to 0. A
meaning of a value of this field may be differently set depending
on embodiments.
[0332] @atsc:componentId is an attribute that indicates the
identifier of this component. The value of this attribute can be
the same as the asset_id in the MP table corresponding to this
component
[0333] @atsc:componentName is an attribute that indicates the human
readable name of this component.
[0334] The proposed default values may vary depending on
embodiments. The "use" column illustrated in the figure relates to
each field. Here, M may denote an essential field, O may denote an
optional field, OD may denote an optional field having a default
value, and CM may denote a conditional essential field. 0 . . . 1
to 0 . . . N may indicate the number of available fields.
[0335] Hereinafter, a description will be given of MPD for MMT.
[0336] The Media Presentation Description is an SLS metadata
fragment corresponding to a linear service of a given duration
defined by the broadcaster (for example a single TV program, or the
set of contiguous linear TV programs over a period of time). The
contents of the MPD provide the resource identifiers for Segments
and the context for the identified resources within the Media
Presentation. The data structure and semantics of the MPD can be
according to the MPD defined by MPEG DASH.
[0337] In the present embodiment, an MPD delivered by an MMTP
session describes Representations delivered over broadband, e.g. in
the case of a hybrid service, or to support service continuity in
handoff from broadcast to broadband due to broadcast signal
degradation (e.g. driving under a mountain or through a
tunnel).
[0338] Hereinafter, a description will be given of an MMT signaling
message for MMT.
[0339] When MMTP sessions are used to carry a streaming service,
MMT signaling messages defined by MMT are delivered by MMTP packets
according to Signaling Message Mode defined by MMT. The value of
the packet_id field of MMTP packets carrying Service Layer
Signaling isset to `00` except for MMTP packets carrying MMT
signaling messages specific to an Asset, which can be set to the
same packet_id value as the MMTP packets carrying the Asset.
Identifiers referencing the appropriate Package for each service
are signaled by the USBD fragment as described above. MMT Package
Table (MPT) messages with matching MMT_package_id can be delivered
on the MMTP session signaled in the SLT. Each MMTP session carries
MMT signaling messages specific to its session or each asset
delivered by the MMTP session.
[0340] In other words, it is possible to access USBD of the MMTP
session by specifying an IP destination address/port number, etc.
of a packet having the SLS for a particular service in the SLT. As
described in the foregoing, a packet ID of an MMTP packet carrying
the SLS may be designated as a particular value such as 00, etc. It
is possible to access an MPT message having a matched packet ID
using the above-described package IP information of USBD. As
described below, the MPT message may be used to access each service
component/asset.
[0341] The following MMTP messages can be delivered by the MMTP
session signaled in the SLT.
[0342] MMT Package Table (MPT) message: This message carries an MP
(MMT Package) table which contains the list of all Assets and their
location information as defined by MMT. If an Asset is delivered by
a PLP different from the current PLP delivering the MP table, the
identifier of the PLP carrying the Asset can be provided in the MP
table using Physical Layer Pipe Identifier Descriptor. The physical
layer pipe identifier descriptor will be described below.
[0343] MMT ATSC3 (MA3) message mmt_atsc3_message( ): This message
carries system metadata specific for services including Service
Layer Signaling as described above. mmt_atsc3_message( ) will be
described below.
[0344] The following MMTP messages can be delivered by the MMTP
session signaled in the SLT, if required.
[0345] Media Presentation Information (MPI) message: This message
carries an MPI table which contains the whole document or a subset
of a document of presentation information. An MP table associated
with the MPI table also can be delivered by this message.
[0346] Clock Relation Information (CRI) message: This message
carries a CRI table which contains clock related information for
the mapping between the NTP timestamp and the MPEG-2 STC. According
to a given embodiment, the CRI message may not be delivered through
the MMTP session.
[0347] The following MMTP messages can be delivered by each MMTP
session carrying streaming content.
[0348] Hypothetical Receiver Buffer Model message: This message
carries information required by the receiver to manage its
buffer.
[0349] Hypothetical Receiver Buffer Model Removal message: This
message carries information required by the receiver to manage its
MMT de-capsulation buffer.
[0350] Hereinafter, a description will be given of
mmt_atsc3_message( ) corresponding to one of MMT signaling
messages. An MMT Signaling message mmt_atsc3_message( ) is defined
to deliver information specific to services according to the
present invention described above. The signaling message may
include message ID, version, and/or length fields corresponding to
basic fields of the MMT signaling message. A payload of the
signaling message may include service ID information, content type
information, content version information, content compression
information and/or URI information. The content type information
may indicate a type of data included in the payload of the
signaling message. The content version information may indicate a
version of data included in the payload, and the content
compression information may indicate a type of compression applied
to the data. The URI information may have URI information related
to content delivered by the message.
[0351] Hereinafter, a description will be given of the physical
layer pipe identifier descriptor.
[0352] The physical layer pipe identifier descriptor is a
descriptor that can be used as one of descriptors of the MP table
described above. The Physical Layer Pipe Identifier Descriptor
provides information about the PLP carrying an Asset. If an Asset
is delivered by a PLP different from the current PLP delivering the
MP table, the Physical Layer Pipe Identifier Descriptor can be used
as an asset descriptor in the associated MP table to identify the
PLP carrying the Asset. The physical layer pipe identifier
descriptor may further include BSID information in addition to PLP
ID information. The BSID may be an ID of a broadcast stream that
delivers an MMTP packet for an asset described by the
descriptor.
[0353] FIG. 8 illustrates a link layer protocol architecture
according to an embodiment of the present invention.
[0354] Hereinafter, a link layer will be described.
[0355] The link layer is the layer between the physical layer and
the network layer, and transports the data from the network layer
to the physical layer at the sending side and transports the data
from the physical layer to the network layer at the receiving side.
The purpose of the link layer includes abstracting all input packet
types into a single format for processing by the physical layer,
ensuring flexibility and future extensibility for as yet undefined
input types. In addition, processing within the link layer ensures
that the input data can be transmitted in an efficient manner, for
example by providing options to compress redundant information in
the headers of input packets. The operations of encapsulation,
compression and so on are referred to as the link layer protocol
and packets created using this protocol are called link layer
packets. The link layer may perform functions such as packet
encapsulation, overhead reduction and/or signaling transmission,
etc.
[0356] Hereinafter, packet encapsulation will be described. Link
Layer protocol allows encapsulation of any type of packet,
including ones such as IP packets and MPEG-2 TS. Using Link Layer
protocol, the physical layer need only process one single packet
format, independent of the network layer protocol type (here we
consider MPEG-2 TS packet as a kind of network layer packet.) Each
network layer packet or input packet is transformed into the
payload of a generic link layer packet. Additionally, concatenation
and segmentation can be performed in order to use the physical
layer resources efficiently when the input packet sizes are
particularly small or large.
[0357] As described in the foregoing, segmentation may be used in
packet encapsulation. When the network layer packet is too large to
process easily in the physical layer, the network layer packet is
divided into two or more segments. The link layer packet header
includes protocol fields to perform segmentation on the sending
side and reassembly on the receiving side. When the network layer
packet is segmented, each segment can be encapsulated to link layer
packet in the same order as original position in the network layer
packet. Also each link layer packet which includes a segment of
network layer packet can be transported to PHY layer
consequently.
[0358] As described in the foregoing, concatenation may be used in
packet encapsulation. When the network layer packet is small enough
for the payload of a link layer packet to include several network
layer packets, the link layer packet header includes protocol
fields to perform concatenation. The concatenation is combining of
multiple small sized network layer packets into one payload. When
the network layer packets are concatenated, each network layer
packet can be concatenated to payload of link layer packet in the
same order as original input order. Also each packet which
constructs a payload of link layer packet can be whole packet, not
a segment of packet.
[0359] Hereinafter, overhead reduction will be described. Use of
the link layer protocol can result in significant reduction in
overhead for transport of data on the physical layer. The link
layer protocol according to the present invention may provide IP
overhead reduction and/or MPEG-2 TS overhead reduction. In IP
overhead reduction, IP packets have a fixed header format, however
some of the information which is needed in a communication
environment may be redundant in a broadcast environment. Link Layer
protocol provides mechanisms to reduce the broadcast overhead by
compressing headers of IP packets. In MPEG-2 TS overhead reduction,
Link Layer protocol provides sync byte removal, null packet
deletion and/or common header removal (compression). First, sync
byte removal provides an overhead reduction of one byte per TS
packet, secondly a null packet deletion mechanism removes the 188
byte null TS packets in a manner that they can be re-inserted at
the receiver and finally a common header removal mechanism.
[0360] For signaling transmission, in the link layer protocol, a
particular format for the signaling packet may be provided for link
layer signaling, which will be described below.
[0361] In the illustrated link layer protocol architecture
according to an embodiment of the present invention, Link Layer
protocol takes as input network layer packets such as IPv4, MPEG-2
TS and so on as input packets. Future extension indicates other
packet types and protocol which is also possible to be input in
link layer. Link layer protocol also specifies the format and
signaling for any link layer signaling, including information about
mapping to specific channel to the physical layer. Figure also
shows how ALP incorporates mechanisms to improve the efficiency of
transmission, via various header compression and deletion
algorithms. In addition, the link layer protocol may basically
encapsulate input packets.
[0362] FIG. 9 illustrates a structure of a base header of a link
layer packet according to an embodiment of the present invention.
Hereinafter, the structure of the header will be described.
[0363] A link layer packet can include a header followed by the
data payload. The header of a link layer packet can include a base
header, and may include an additional header depending on the
control fields of the base header. The presence of an optional
header is indicated from flag fields of the additional header.
According to a given embodiment, a field indicating the presence of
an additional header and an optional header may be positioned in
the base header.
[0364] Hereinafter, the structure of the base header will be
described. The base header for link layer packet encapsulation has
a hierarchical structure. The base header can be two bytes in
length and is the minimum length of the link layer packet
header.
[0365] The illustrated base header according to the present
embodiment may include a Packet_Type field, a PC field and/or a
length field. According to a given embodiment, the base header may
further include an HM field or an S/C field.
[0366] Packet_Type field can be a 3-bit field that indicates the
original protocol or packet type of the input data before
encapsulation into a link layer packet. An IPv4 packet, a
compressed IP packet, a link layer signaling packet, and other
types of packets may have the base header structure and may be
encapsulated. However, according to a given embodiment, the MPEG-2
TS packet may have a different particular structure, and may be
encapsulated. When the value of Packet_Type is "000", "001" "100"
or "111", that is the original data type of an ALP packet is one of
an IPv4 packet, a compressed IP packet, link layer signaling or
extension packet. When the MPEG-2 TS packet is encapsulated, the
value of Packet_Type can be "010". Other values of the Packet_Type
field may be reserved for future use.
[0367] Payload_Configuration (PC) field can be a 1-bit field that
indicates the configuration of the payload. A value of 0 can
indicate that the link layer packet carries a single, whole input
packet and the following field is the Header_Mode field. A value of
1 can indicate that the link layer packet carries more than one
input packet (concatenation) or a part of a large input packet
(segmentation) and the following field is the
Segmentation_Concatenation field.
[0368] Header_Mode (HM) field can be a 1-bit field, when set to 0,
that can indicate there is no additional header, and that the
length of the payload of the link layer packet is less than 2048
bytes. This value may be varied depending on embodiments. A value
of 1 can indicate that an additional header for single packet
defined below is present following the Length field. In this case,
the length of the payload is larger than 2047 bytes and/or optional
features can be used (sub-stream identification, header extension,
etc.). This value may be varied depending on embodiments. This
field can be present only when Payload_Configuration field of the
link layer packet has a value of 0.
[0369] Segmentation_Concatenation (S/C) field can be a 1-bit field,
when set to 0, that can indicate that the payload carries a segment
of an input packet and an Additional header for segmentation
defined below is present following the Length field. A value of 1
can indicate that the payload carries more than one complete input
packet and an Additional header for concatenation defined below is
present following the Length field. This field can be present only
when the value of Payload_Configuration field of the ALP packet is
1.
[0370] Length field can be a 11-bit field that indicates the 11
least significant bits (LSBs) of the length in bytes of payload
carried by the link layer packet. When there is a Length_MSB field
in the following additional header, the Length field is
concatenated with the Length_MSB field, and is the LSB to provide
the actual total length of the payload. The number of bits of the
length field may be changed to another value rather than 11
bits.
[0371] Following types of packet configuration are thus possible: a
single packet without any additional header, a single packet with
an additional header, a segmented packet and a concatenated packet.
According to a given embodiment, more packet configurations may be
made through a combination of each additional header, an optional
header, an additional header for signaling information to be
described below, and an additional header for time extension.
[0372] FIG. 10 illustrates a structure of an additional header of a
link layer packet according to an embodiment of the present
invention.
[0373] Various types of additional headers may be present.
Hereinafter, a description will be given of an additional header
for a single packet.
[0374] This additional header for single packet can be present when
Header_Mode (HM)="1". The Header_Mode (HM) can be set to 1 when the
length of the payload of the link layer packet is larger than 2047
bytes or when the optional fields are used. The additional header
for single packet is shown in Figure (tsib10010).
[0375] Length_MSB field can be a 5-bit field that can indicate the
most significant bits (MSBs) of the total payload length in bytes
in the current link layer packet, and is concatenated with the
Length field containing the 11 least significant bits (LSBs) to
obtain the total payload length. The maximum length of the payload
that can be signaled is therefore 65535 bytes. The number of bits
of the length field may be changed to another value rather than 11
bits. In addition, the number of bits of the Length_MSB field may
be changed, and thus a maximum expressible payload length may be
changed. According to a given embodiment, each length field may
indicate a length of a whole link layer packet rather than a
payload.
[0376] SIF (Sub-stream Identifier Flag) field can be a 1-bit field
that can indicate whether the sub-stream ID (SID) is present after
the HEF field or not. When there is no SID in this link layer
packet, SIF field can be set to 0. When there is a SID after HEF
field in the link layer packet, SIF can be set to 1. The detail of
SID is described below.
[0377] HEF (Header Extension Flag) field can be a 1-bit field that
can indicate, when set to 1 additional header is present for future
extension. A value of 0 can indicate that this extension header is
not present.
[0378] Hereinafter, a description will be given of an additional
header when segmentation is used.
[0379] This additional header (tsib10020) can be present when
Segmentation_Concatenation (S/C)="0". Segment_Sequence_Number can
be a 5-bit unsigned integer that can indicate the order of the
corresponding segment carried by the link layer packet. For the
link layer packet which carries the first segment of an input
packet, the value of this field can be set to 0x0. This field can
be incremented by one with each additional segment belonging to the
segmented input packet.
[0380] Last_Segment_Indicator (LSI) can be a 1-bit field that can
indicate, when set to 1, that the segment in this payload is the
last one of input packet. A value of 0, can indicate that it is not
last segment.
[0381] SIF (Sub-stream Identifier Flag) can be a 1-bit field that
can indicate whether the SID is present after the HEF field or not.
When there is no SID in the link layer packet, SIF field can be set
to 0. When there is a SID after the HEF field in the link layer
packet, SIF can be set to 1.
[0382] HEF (Header Extension Flag) can be a This 1-bit field that
can indicate, when set to 1, that the optional header extension is
present after the additional header for future extensions of the
link layer header. A value of 0 can indicate that optional header
extension is not present.
[0383] According to a given embodiment, a packet ID field may be
additionally provided to indicate that each segment is generated
from the same input packet. This field may be unnecessary and thus
be omitted when segments are transmitted in order.
[0384] Hereinafter, a description will be given of an additional
header when concatenation is used.
[0385] This additional header (tsib10030) can be present when
Segmentation_Concatenation (S/C)="1".
[0386] Length_MSB can be a 4-bit field that can indicate MSB bits
of the payload length in bytes in this link layer packet. The
maximum length of the payload is 32767 bytes for concatenation. As
described in the foregoing, a specific numeric value may be
changed.
[0387] Count can be a field that can indicate the number of the
packets included in the link layer packet. The number of the
packets included in the link layer packet, 2 can be set to this
field. So, its maximum value of concatenated packets in a link
layer packet is 9. A scheme in which the count field indicates the
number may be varied depending on embodiments. That is, the numbers
from 1 to 8 may be indicated.
[0388] HEF (Header Extension Flag) can be a 1-bit field that can
indicate, when set to 1 the optional header extension is present
after the additional header for future extensions of the link layer
header. A value of 0, can indicate extension header is not
present.
[0389] Component_Length can be a is 12-bit length field that can
indicate the length in byte of each packet. Component_Length fields
are included in the same order as the packets present in the
payload except last component packet. The number of length field
can be indicated by (Count+1). According to a given embodiment,
length fields, the number of which is the same as a value of the
count field, may be present. When a link layer header consists of
an odd number of Component_Length, four stuffing bits can follow
after the last Component_Length field. These bits can be set to 0.
According to a given embodiment, a Component_length field
indicating a length of a last concatenated input packet may not be
present. In this case, the length of the last concatenated input
packet may correspond to a length obtained by subtracting a sum of
values indicated by respective Component_length fields from a whole
payload length.
[0390] Hereinafter, the optional header will be described.
[0391] As described in the foregoing, the optional header may be
added to a rear of the additional header. The optional header field
can contain SID and/or header extension. The SID is used to filter
out specific packet stream in the link layer level. One example of
SID is the role of service identifier in a link layer stream
carrying multiple services. The mapping information between a
service and the SID value corresponding to the service can be
provided in the SLT, if applicable. The header extension contains
extended field for future use. Receivers can ignore any header
extensions which they do not understand.
[0392] SID (Sub-stream Identifier) can be a 8-bit field that can
indicate the sub stream identifier for the link layer packet. If
there is optional header extension, SID present between additional
header and optional header extension.
[0393] Header_Extension( ) can include the fields defined
below.
[0394] Extension_Type can be a 8-bit field that can indicate the
type of the Header_Extension ( ).
[0395] Extension_Length can be a 8-bit field that can indicate the
length of the Header Extension( ) in bytes counting from the next
byte to the last byte of the Header_Extension( ).
[0396] Extension_Byte can be a byte representing the value of the
Header_Extension( ).
[0397] FIG. 11 illustrates a structure of an additional header of a
link layer packet according to another embodiment of the present
invention.
[0398] Hereinafter, a description will be given of an additional
header for signaling information.
[0399] How link layer signaling is incorporated into link layer
packets are as follows. Signaling packets are identified by when
the Packet_Type field of the base header is equal to 100.
[0400] Figure (tsib11010) shows the structure of the link layer
packets containing additional header for signaling information. In
addition to the link layer header, the link layer packet can
consist of two additional parts, additional header for signaling
information and the actual signaling data itself. The total length
of the link layer signaling packet is shown in the link layer
packet header.
[0401] The additional header for signaling information can include
following fields. According to a given embodiment, some fields may
be omitted.
[0402] Signaling_Type can be a 8-bit field that can indicate the
type of signaling.
[0403] Signaling_Type_Extension can be a 16-bit filed that can
indicate the attribute of the signaling. Detail of this field can
be defined in signaling specification.
[0404] Signaling_Version can be a 8-bit field that can indicate the
version of signaling.
[0405] Signaling_Format can be a 2-bit field that can indicate the
data format of the signaling data. Here, a signaling format may
refer to a data format such as a binary format, an XML format,
etc.
[0406] Signaling_Encoding can be a 2-bit field that can specify the
encoding/compression format. This field may indicate whether
compression is not performed and which type of compression is
performed.
[0407] Hereinafter, a description will be given of an additional
header for packet type extension.
[0408] In order to provide a mechanism to allow an almost unlimited
number of additional protocol and packet types to be carried by
link layer in the future, the additional header is defined. Packet
type extension can be used when Packet_type is 111 in the base
header as described above. Figure (tsib11020) shows the structure
of the link layer packets containing additional header for type
extension.
[0409] The additional header for type extension can include
following fields. According to a given embodiment, some fields may
be omitted.
[0410] extended_type can be a 16-bit field that can indicate the
protocol or packet type of the input encapsulated in the link layer
packet as payload. This field cannot be used for any protocol or
packet type already defined by Packet_Type field.
[0411] FIG. 12 illustrates a header structure of a link layer
packet for an MPEG-2 TS packet and an encapsulation process thereof
according to an embodiment of the present invention.
[0412] Hereinafter, a description will be given of a format of the
link layer packet when the MPEG-2 TS packet is input as an input
packet.
[0413] In this case, the Packet_Type field of the base header is
equal to 010. Multiple TS packets can be encapsulated within each
link layer packet. The number of TS packets is signaled via the
NUMTS field. In this case, as described in the foregoing, a
particular link layer packet header format may be used.
[0414] Link layer provides overhead reduction mechanisms for MPEG-2
TS to enhance the transmission efficiency. The sync byte (0x47) of
each TS packet can be deleted. The option to delete NULL packets
and similar TS headers is also provided.
[0415] In order to avoid unnecessary transmission overhead, TS null
packets (PID=0x1FFF) may be removed. Deleted null packets can be
recovered in receiver side using DNP field. The DNP field indicates
the count of deleted null packets. Null packet deletion mechanism
using DNP field is described below.
[0416] In order to achieve more transmission efficiency, similar
header of MPEG-2 TS packets can be removed. When two or more
successive TS packets have sequentially increased continuity
counter fields and other header fields are the same, the header is
sent once at the first packet and the other headers are deleted.
HDM field can indicate whether the header deletion is performed or
not. Detailed procedure of common TS header deletion is described
below.
[0417] When all three overhead reduction mechanisms are performed,
overhead reduction can be performed in sequence of sync removal,
null packet deletion, and common header deletion. According to a
given embodiment, a performance order of respective mechanisms may
be changed. In addition, some mechanisms may be omitted according
to a given embodiment.
[0418] The overall structure of the link layer packet header when
using MPEG-2 TS packet encapsulation is depicted in Figure
(tsib12010).
[0419] Hereinafter, a description will be given of each illustrated
field. Packet_Type can be a 3-bit field that can indicate the
protocol type of input packet as describe above. For MPEG-2 TS
packet encapsulation, this field can always be set to 010.
[0420] NUMTS (Number of TS packets) can be a 4-bit field that can
indicate the number of TS packets in the payload of this link layer
packet. A maximum of 16 TS packets can be supported in one link
layer packet. The value of NUMTS=0 can indicate that 16 TS packets
are carried by the payload of the link layer packet. For all other
values of NUMTS, the same number of TS packets are recognized, e.g.
NUMTS=0001 means one TS packet is carried.
[0421] AHF (Additional Header Flag) can be a field that can
indicate whether the additional header is present of not. A value
of 0 indicates that there is no additional header. A value of 1
indicates that an additional header of length 1-byte is present
following the base header. If null TS packets are deleted or TS
header compression is applied this field can be set to 1. The
additional header for TS packet encapsulation consists of the
following two fields and is present only when the value of AHF in
this link layer packet is set to 1.
[0422] HDM (Header Deletion Mode) can be a 1-bit field that
indicates whether TS header deletion can be applied to this link
layer packet. A value of 1 indicates that TS header deletion can be
applied. A value of "0" indicates that the TS header deletion
method is not applied to this link layer packet.
[0423] DNP (Deleted Null Packets) can be a 7-bit field that
indicates the number of deleted null TS packets prior to this link
layer packet. A maximum of 128 null TS packets can be deleted. When
HDM=0 the value of DNP=0 can indicate that 128 null packets are
deleted. When HDM=1 the value of DNP=0 can indicate that no null
packets are deleted. For all other values of DNP, the same number
of null packets are recognized, e.g. DNP=5 means 5 null packets are
deleted.
[0424] The number of bits of each field described above may be
changed. According to the changed number of bits, a minimum/maximum
value of a value indicated by the field may be changed. These
numbers may be changed by a designer.
[0425] Hereinafter, SYNC byte removal will be described.
[0426] When encapsulating TS packets into the payload of a link
layer packet, the SYNC byte (0x47) from the start of each TS packet
can be deleted. Hence the length of the MPEG2-TS packet
encapsulated in the payload of the link layer packet is always of
length 187 bytes (instead of 188 bytes originally).
[0427] Hereinafter, null packet deletion will be described.
[0428] Transport Stream rules require that bit rates at the output
of a transmitter's multiplexer and at the input of the receiver's
de-multiplexer are constant in time and the end-to-end delay is
also constant. For some Transport Stream input signals, null
packets may be present in order to accommodate variable bitrate
services in a constant bitrate stream. In this case, in order to
avoid unnecessary transmission overhead, TS null packets (that is
TS packets with PID=0x1FFF) may be removed. The process is
carried-out in a way that the removed null packets can be
re-inserted in the receiver in the exact place where they were
originally, thus guaranteeing constant bitrate and avoiding the
need for PCR time stamp updating.
[0429] Before generation of a link layer packet, a counter called
DNP (Deleted Null-Packets) can first be reset to zero and then
incremented for each deleted null packet preceding the first
non-null TS packet to be encapsulated into the payload of the
current link layer packet. Then a group of consecutive useful TS
packets is encapsulated into the payload of the current link layer
packet and the value of each field in its header can be determined.
After the generated link layer packet is injected to the physical
layer, the DNP is reset to zero. When DNP reaches its maximum
allowed value, if the next packet is also a null packet, this null
packet is kept as a useful packet and encapsulated into the payload
of the next link layer packet. Each link layer packet can contain
at least one useful TS packet in its payload.
[0430] Hereinafter, TS packet header deletion will be described. TS
packet header deletion may be referred to as TS packet header
compression.
[0431] When two or more successive TS packets have sequentially
increased continuity counter fields and other header fields are the
same, the header is sent once at the first packet and the other
headers are deleted. When the duplicated MPEG-2 TS packets are
included in two or more successive TS packets, header deletion
cannot be applied in transmitter side. HDM field can indicate
whether the header deletion is performed or not. When TS header
deletion is performed, HDM can be set to 1. In the receiver side,
using the first packet header, the deleted packet headers are
recovered, and the continuity counter is restored by increasing it
in order from that of the first header.
[0432] An example tsib12020 illustrated in the figure is an example
of a process in which an input stream of a TS packet is
encapsulated into a link layer packet. First, a TS stream including
TS packets having SYNC byte (0x47) may be input. First, sync bytes
may be deleted through a sync byte deletion process. In this
example, it is presumed that null packet deletion is not
performed.
[0433] Here, it is presumed that packet headers of eight TS packets
have the same field values except for CC, that is, a continuity
counter field value. In this case, TS packet deletion/compression
may be performed. Seven remaining TS packet headers are deleted
except for a first TS packet header corresponding to CC=1. The
processed TS packets may be encapsulated into a payload of the link
layer packet.
[0434] In a completed link layer packet, a Packet_Type field
corresponds to a case in which TS packets are input, and thus may
have a value of 010. A NUMTS field may indicate the number of
encapsulated TS packets. An AHF field may be set to 1 to indicate
the presence of an additional header since packet header deletion
is performed. An HDM field may be set to 1 since header deletion is
performed. DNP may be set to 0 since null packet deletion is not
performed.
[0435] FIG. 13 illustrates an example of adaptation modes in IP
header compression according to an embodiment of the present
invention (transmitting side).
[0436] Hereinafter, IP header compression will be described.
[0437] In the link layer, IP header compression/decompression
scheme can be provided. IP header compression can include two
parts: header compressor/decompressor and adaptation module. The
header compression scheme can be based on the Robust Header
Compression (RoHC). In addition, for broadcasting usage, adaptation
function is added.
[0438] In the transmitter side, RoHC Compressor reduces the size of
header for each packet. Then, Adaptation module extracts context
information and builds signaling information from each packet
stream. In the receiver side, adaptation module parses the
signaling information associated with the received packet stream
and attaches context information to the received packet stream.
RoHC decompressor reconstructs the original IP packet by recovering
the packet header.
[0439] The header compression scheme can be based on the RoHC as
described above. In particular, in the present system, an RoHC
framework can operate in a unidirctional mode (U mode) of the RoHC.
In addition, in the present system, it is possible to use an RoHC
UDP header compression profile which is identified by a profile
identifier of 0x0002.
[0440] Hereinafter, adaptation will be described.
[0441] In case of transmission through the unidirectional link, if
a receiver has no information of context, decompressor cannot
recover the received packet header until receiving full context.
This may cause channel change delay and turn on delay. For this
reason, context information and configuration parameters between
compressor and decompressor can be always sent with packet
flow.
[0442] The Adaptation function provides out-of-band transmission of
the configuration parameters and context information. Out-of-band
transmission can be done through the link layer signaling.
Therefore, the Adaptation function is used to reduce the channel
change delay and decompression error due to loss of context
information.
[0443] Hereinafter, extraction of context information will be
described.
[0444] Context information may be extracted using various schemes
according to adaptation mode. In the present invention, three
examples will be described below. The scope of the present
invention is not restricted to the examples of the adaptation mode
to be described below. Here, the adaptation mode may be referred to
as a context extraction mode.
[0445] Adaptation Mode 1 (not illustrated) may be a mode in which
no additional operation is applied to a basic RoHC packet stream.
In other words, the adaptation module may operate as a buffer in
this mode. Therefore, in this mode, context information may not be
included in link layer signaling.
[0446] In Adaptation Mode 2 (tsib13010), the adaptation module can
detect the IR packet from RoHC packet flow and extract the context
information (static chain). After extracting the context
information, each IR packet can be converted to an IR-DYN packet.
The converted IR-DYN packet can be included and transmitted inside
the RoHC packet flow in the same order as IR packet, replacing the
original packet.
[0447] In Adaptation Mode 3 (tsib13020), the adaptation module can
detect the IR and IR-DYN packet from RoHC packet flow and extract
the context information. The static chain and dynamic chain can be
extracted from IR packet and dynamic chain can be extracted from
IR-DYN packet. After extracting the context information, each IR
and IR-DYN packet can be converted to a compressed packet. The
compressed packet format can be the same with the next packet of IR
or IR-DYN packet. The converted compressed packet can be included
and transmitted inside the RoHC packet flow in the same order as IR
or IR-DYN packet, replacing the original packet.
[0448] Signaling (Context) information can be encapsulated based on
transmission structure. For example, context information can be
encapsulated to the link layer signaling. In this case, the packet
type value can be set to `100`.
[0449] In the above-described Adaptation Modes 2 and 3, a link
layer packet for context information may have a packet type field
value of 100. In addition, a link layer packet for compressed IP
packets may have a packet type field value of 001. The values
indicate that each of the signaling information and the compressed
IP packets are included in the link layer packet as described
above.
[0450] Hereinafter, a description will be given of a method of
transmitting the extracted context information.
[0451] The extracted context information can be transmitted
separately from RoHC packet flow, with signaling data through
specific physical data path. The transmission of context depends on
the configuration of the physical layer path. The context
information can be sent with other link layer signaling through the
signaling data pipe.
[0452] In other words, the link layer packet having the context
information may be transmitted through a signaling PLP together
with link layer packets having other link layer signaling
information (Packet_Type=100). Compressed IP packets from which
context information is extracted may be transmitted through a
general PLP (Packet_Type=001). Here, depending on embodiments, the
signaling PLP may refer to an L1 signaling path. In addition,
depending on embodiments, the signaling PLP may not be separated
from the general PLP, and may refer to a particular and general PLP
through which the signaling information is transmitted.
[0453] At a receiving side, prior to reception of a packet stream,
a receiver may need to acquire signaling information. When receiver
decodes initial PLP to acquire the signaling information, the
context signaling can be also received. After the signaling
acquisition is done, the PLP to receive packet stream can be
selected. In other words, the receiver may acquire the signaling
information including the context information by selecting the
initial PLP. Here, the initial PLP may be the above-described
signaling PLP. Thereafter, the receiver may select a PLP for
acquiring a packet stream. In this way, the context information may
be acquired prior to reception of the packet stream.
[0454] After the PLP for acquiring the packet stream is selected,
the adaptation module can detect IR-DYN packet form received packet
flow. Then, the adaptation module parses the static chain from the
context information in the signaling data. This is similar to
receiving the IR packet. For the same context identifier, IR-DYN
packet can be recovered to IR packet. Recovered RoHC packet flow
can be sent to RoHC decompressor. Thereafter, decompression may be
started.
[0455] FIG. 14 illustrates a link mapping table (LMT) and an RoHC-U
description table according to an embodiment of the present
invention.
[0456] Hereinafter, link layer signaling will be described.
[0457] Generally, link layer signaling is operates under IP level.
In the receiver side, link layer signaling can be obtained earlier
than IP level signaling such as Service List Table (SLT) and
Service Layer Signaling (SLS). Therefore, link layer signaling can
be obtained before session establishment.
[0458] For link layer signaling, there can be two kinds of
signaling according input path: internal link layer signaling and
external link layer signaling. The internal link layer signaling is
generated in link layer at transmitter side. And the link layer
takes the signaling from external module or protocol. This kind of
signaling information is considered as external link layer
signaling. If some signaling need to be obtained prior to IP level
signaling, external signaling is transmitted in format of link
layer packet.
[0459] The link layer signaling can be encapsulated into link layer
packet as described above. The link layer packets can carry any
format of link layer signaling, including binary and XML. The same
signaling information may not be transmitted in different formats
for the link layer signaling.
[0460] Internal link layer signaling may include signaling
information for link mapping. The Link Mapping Table (LMT) provides
a list of upper layer sessions carried in a PLP. The LMT also
provides addition information for processing the link layer packets
carrying the upper layer sessions in the link layer.
[0461] An example of the LMT (tsib14010) according to the present
invention is illustrated.
[0462] signaling_type can be an 8-bit unsigned integer field that
indicates the type of signaling carried by this table. The value of
signaling_type field for Link Mapping Table (LMT) can be set to
0x01.
[0463] PLP_ID can be an 8-bit field that indicates the PLP
corresponding to this table.
[0464] num_session can be an 8-bit unsigned integer field that
provides the number of upper layer sessions carried in the PLP
identified by the above PLP_ID field. When the value of
signaling_type field is 0x01, this field can indicate the number of
UDP/IP sessions in the PLP.
[0465] src_IP add can be a 32-bit unsigned integer field that
contains the source IP address of an upper layer session carried in
the PLP identified by the PLP_ID field.
[0466] dst_IP add can be a 32-bit unsigned integer field that
contains the destination IP address of an upper layer session
carried in the PLP identified by the PLP_ID field.
[0467] src_UDP_port can be a 16-bit unsigned integer field that
represents the source UDP port number of an upper layer session
carried in the PLP identified by the PLP_ID field.
[0468] dst_UDP_port can be a 16-bit unsigned integer field that
represents the destination UDP port number of an upper layer
session carried in the PLP identified by the PLP_ID field.
[0469] SID_flag can be a 1-bit Boolean field that indicates whether
the link layer packet carrying the upper layer session identified
by above 4 fields, Src_IP_add, Dst_IP_add, Src_UDP_Port and
Dst_UDP_Port, has an SID field in its optional header. When the
value of this field is set to 0, the link layer packet carrying the
upper layer session may not have an SID field in its optional
header. When the value of this field is set to 1, the link layer
packet carrying the upper layer session can have an SID field in
its optional header and the value the SID field can be same as the
following SID field in this table.
[0470] compressed_flag can be a 1-bit Boolean field that indicates
whether the header compression is applied the link layer packets
carrying the upper layer session identified by above 4 fields,
Src_IP_add, Dst_IP_add, Src_UDP_Port and Dst_UDP_Port. When the
value of this field is set to 0, the link layer packet carrying the
upper layer session may have a value of 0x00 of Packet_Type field
in its base header. When the value of this field is set to 1, the
link layer packet carrying the upper layer session may have a value
of 0x01 of Packet_Type field in its base header and the Context_ID
field can be present.
[0471] SID can be an 8-bit unsigned integer field that indicates
sub-stream identifier for the link layer packets carrying the upper
layer session identified by above 4 fields, Src_IP_add, Dst_IP_add,
Src_UDP_Port and Dst_UDP_Port. This field can be present when the
value of SID_flag is equal to 1.
[0472] context_id can be an 8-bit field that provides a reference
for the context id (CID) provided in the ROHC-U description table.
This field can be present when the value of compressed_flag is
equal to 1.
[0473] An example of the RoHC-U description table (tsib14020)
according to the present invention is illustrated. As described in
the foregoing, the RoHC-U adaptation module may generate
information related to header compression.
[0474] signaling_type can be an 8-bit field that indicates the type
of signaling carried by this table. The value of signaling_type
field for ROHC-U description table (RDT) can be set to "0x02".
[0475] PLP_ID can be an 8-bit field that indicates the PLP
corresponding to this table.
[0476] context_id can be an 8-bit field that indicates the context
id (CID) of the compressed IP stream. In this system, 8-bit CID can
be used for large CID.
[0477] context_profile can be an 8-bit field that indicates the
range of protocols used to compress the stream. This field can be
omitted.
[0478] adaptation_mode can be a 2-bit field that indicates the mode
of adaptation module in this PLP. Adaptation modes have been
described above.
[0479] context_config can be a 2-bit field that indicates the
combination of the context information. If there is no context
information in this table, this field may be set to "0x0". If the
static_chain( ) or dynamic_chain( ) byte is included in this table,
this field may be set to `0x01` or `0x02` respectively. If both of
the static_chain( ) and dynamic_chain( ) byte are included in this
table, this field may be set to `0x03`.
[0480] context_length can be an 8-bit field that indicates the
length of the static_chain byte sequence. This field can be
omitted.
[0481] static_chain_byte( ) can be a field that conveys the static
information used to initialize the RoHC-U decompressor. The size
and structure of this field depend on the context profile.
[0482] dynamic_chain_byte( ) can be a field that conveys the
dynamic information used to initialize the RoHC-U decompressor. The
size and structure of this field depend on the context profile.
[0483] The static_chain_byte can be defined as sub-header
information of IR packet. The dynamic_chain byte can be defined as
sub-header information of IR packet and IR-DYN packet.
[0484] FIG. 15 illustrates a structure of a link layer on a
transmitter side according to an embodiment of the present
invention.
[0485] The present embodiment presumes that an IP packet is
processed. From a functional point of view, the link layer on the
transmitter side may broadly include a link layer signaling part in
which signaling information is processed, an overhead reduction
part, and/or an encapsulation part. In addition, the link layer on
the transmitter side may include a scheduler for controlling and
scheduling an overall operation of the link layer and/or input and
output parts of the link layer.
[0486] First, signaling information of an upper layer and/or a
system parameter tsib15010 may be delivered to the link layer. In
addition, an IP stream including IP packets may be delivered to the
link layer from an IP layer tsib15110.
[0487] As described above, the scheduler tsib15020 may determine
and control operations of several modules included in the link
layer. The delivered signaling information and/or system parameter
tsib15010 may be falterer or used by the scheduler tsib15020.
Information, which corresponds to a part of the delivered signaling
information and/or system parameter tsib15010, necessary for a
receiver may be delivered to the link layer signaling part. In
addition, information, which corresponds to a part of the signaling
information, necessary for an operation of the link layer may be
delivered to an overhead reduction controller tsib15120 or an
encapsulation controller tsib15180.
[0488] The link layer signaling part may collect information to be
transmitted as a signal in a physical layer, and convert/configure
the information in a form suitable for transmission. The link layer
signaling part may include a signaling manager tsib15030, a
signaling formatter tsib15040, and/or a buffer for channels
tsib15050.
[0489] The signaling manager tsib15030 may receive signaling
information delivered from the scheduler tsib15020 and/or signaling
(and/or context) information delivered from the overhead reduction
part. The signaling manager tsib15030 may determine a path for
transmission of the signaling information for delivered data. The
signaling information may be delivered through the path determined
by the signaling manager tsib15030. As described in the foregoing,
signaling information to be transmitted through a divided channel
such as the FIC, the EAS, etc. may be delivered to the signaling
formatter tsib15040, and other signaling information may be
delivered to an encapsulation buffer tsib15070.
[0490] The signaling formatter tsib15040 may format related
signaling information in a form suitable for each divided channel
such that signaling information may be transmitted through a
separately divided channel. As described in the foregoing, the
physical layer may include separate physically/logically divided
channels. The divided channels may be used to transmit FIC
signaling information or EAS-related information. The FIC or
EAS-related information may be sorted by the signaling manager
tsib15030, and input to the signaling formatter tsib15040. The
signaling formatter tsib15040 may format the information based on
each separate channel. When the physical layer is designed to
transmit particular signaling information through a separately
divided channel other than the FIC and the EAS, a signaling
formatter for the particular signaling information may be
additionally provided. Through this scheme, the link layer may be
compatible with various physical layers.
[0491] The buffer for channels tsib15050 may deliver the signaling
information received from the signaling formatter tsib15040 to
separate dedicated channels tsib15060. The number and content of
the separate channels may vary depending on embodiments.
[0492] As described in the foregoing, the signaling manager
tsib15030 may deliver signaling information, which is not delivered
to a particular channel, to the encapsulation buffer tsib15070. The
encapsulation buffer tsib15070 may function as a buffer that
receives the signaling information which is not delivered to the
particular channel.
[0493] An encapsulation block for signaling information tsib15080
may encapsulate the signaling information which is not delivered to
the particular channel. A transmission buffer tsib15090 may
function as a buffer that delivers the encapsulated signaling
information to a DP for signaling information tsib15100. Here, the
DP for signaling information tsib15100 may refer to the
above-described PLS region.
[0494] The overhead reduction part may allow efficient transmission
by removing overhead of packets delivered to the link layer. It is
possible to configure overhead reduction parts corresponding to the
number of IP streams input to the link layer.
[0495] An overhead reduction buffer tsib15130 may receive an IP
packet delivered from an upper layer. The received IP packet may be
input to the overhead reduction part through the overhead reduction
buffer tsib15130.
[0496] An overhead reduction controller tsib15120 may determine
whether to perform overhead reduction on a packet stream input to
the overhead reduction buffer tsib15130. The overhead reduction
controller tsib15120 may determine whether to perform overhead
reduction for each packet stream. When overhead reduction is
performed on a packet stream, packets may be delivered to a robust
header compression (RoHC) compressor tsib15140 to perform overhead
reduction. When overhead reduction is not performed on a packet
stream, packets may be delivered to the encapsulation part to
perform encapsulation without overhead reduction. Whether to
perform overhead reduction of packets may be determined based on
the signaling information tsib15010 delivered to the link layer.
The signaling information may be delivered to the encapsulation
controller tsib15180 by the scheduler tsib15020.
[0497] The RoHC compressor tsib15140 may perform overhead reduction
on a packet stream. The RoHC compressor tsib15140 may perform an
operation of compressing a header of a packet. Various schemes may
be used for overhead reduction. Overhead reduction may be performed
using a scheme proposed by the present invention. The present
invention presumes an IP stream, and thus an expression "RoHC
compressor" is used. However, the name may be changed depending on
embodiments. The operation is not restricted to compression of the
IP stream, and overhead reduction of all types of packets may be
performed by the RoHC compressor tsib15140.
[0498] A packet stream configuration block tsib15150 may separate
information to be transmitted to a signaling region and information
to be transmitted to a packet stream from IP packets having
compressed headers. The information to be transmitted to the packet
stream may refer to information to be transmitted to a DP region.
The information to be transmitted to the signaling region may be
delivered to a signaling and/or context controller tsib15160. The
information to be transmitted to the packet stream may be
transmitted to the encapsulation part.
[0499] The signaling and/or context controller tsib15160 may
collect signaling and/or context information and deliver the
signaling and/or context information to the signaling manager in
order to transmit the signaling and/or context information to the
signaling region.
[0500] The encapsulation part may perform an operation of
encapsulating packets in a form suitable for a delivery to the
physical layer. It is possible to configure encapsulation parts
corresponding to the number of IP streams.
[0501] An encapsulation buffer tsib15170 may receive a packet
stream for encapsulation. Packets subjected to overhead reduction
may be received when overhead reduction is performed, and an input
IP packet may be received without change when overhead reduction is
not performed.
[0502] An encapsulation controller tsib15180 may determine whether
to encapsulate an input packet stream. When encapsulation is
performed, the packet stream may be delivered to a
segmentation/concatenation block tsib15190. When encapsulation is
not performed, the packet stream may be delivered to a transmission
buffer tsib15230. Whether to encapsulate packets may be determined
based on the signaling information tsib15010 delivered to the link
layer. The signaling information may be delivered to the
encapsulation controller tsib15180 by the scheduler tsib15020.
[0503] In the segmentation/concatenation block tsib15190, the
above-described segmentation or concatenation operation may be
performed on packets. In other words, when an input IP packet is
longer than a link layer packet corresponding to an output of the
link layer, one IP packet may be segmented into several segments to
configure a plurality of link layer packet payloads. On the other
hand, when an input IP packet is shorter than a link layer packet
corresponding to an output of the link layer, several IP packets
may be concatenated to configure one link layer packet payload.
[0504] A packet configuration table tsib15200 may have
configuration information of a segmented and/or concatenated link
layer packet. A transmitter and a receiver may have the same
information in the packet configuration table tsib15200. The
transmitter and the receiver may refer to the information of the
packet configuration table tsib15200. An index value of the
information of the packet configuration table tsib15200 may be
included in a header of the link layer packet.
[0505] A link layer header information block tsib15210 may collect
header information generated in an encapsulation process. In
addition, the link layer header information block tsib15210 may
collect header information included in the packet configuration
table tsib15200. The link layer header information block tsib15210
may configure header information according to a header structure of
the link layer packet.
[0506] A header attachment block tsib15220 may add a header to a
payload of a segmented and/or concatenated link layer packet. The
transmission buffer tsib15230 may function as a buffer to deliver
the link layer packet to a DP tsib15240 of the physical layer.
[0507] The respective blocks, modules, or parts may be configured
as one module/protocol or a plurality of modules/protocols in the
link layer.
[0508] FIG. 16 illustrates a structure of a link layer on a
receiver side according to an embodiment of the present
invention.
[0509] The present embodiment presumes that an IP packet is
processed. From a functional point of view, the link layer on the
receiver side may broadly include a link layer signaling part in
which signaling information is processed, an overhead processing
part, and/or a decapsulation part. In addition, the link layer on
the receiver side may include a scheduler for controlling and
scheduling overall operation of the link layer and/or input and
output parts of the link layer.
[0510] First, information received through a physical layer may be
delivered to the link layer. The link layer may process the
information, restore an original state before being processed at a
transmitter side, and then deliver the information to an upper
layer. In the present embodiment, the upper layer may be an IP
layer.
[0511] Information, which is separated in the physical layer and
delivered through a particular channel tsib16030, may be delivered
to a link layer signaling part. The link layer signaling part may
determine signaling information received from the physical layer,
and deliver the determined signaling information to each part of
the link layer.
[0512] A buffer for channels tsib16040 may function as a buffer
that receives signaling information transmitted through particular
channels. As described in the foregoing, when physically/logically
divided separate channels are present in the physical layer, it is
possible to receive signaling information transmitted through the
channels. When the information received from the separate channels
is segmented, the segmented information may be stored until
complete information is configured.
[0513] A signaling decoder/parser tsib16050 may verify a format of
the signaling information received through the particular channel,
and extract information to be used in the link layer. When the
signaling information received through the particular channel is
encoded, decoding may be performed. In addition, according to a
given embodiment, it is possible to verify integrity, etc. of the
signaling information.
[0514] A signaling manager tsib16060 may integrate signaling
information received through several paths. Signaling information
received through a DP for signaling tsib16070 to be described below
may be integrated in the signaling manager tsib16060. The signaling
manager tsib16060 may deliver signaling information necessary for
each part in the link layer. For example, the signaling manager
tsib16060 may deliver context information, etc. for recovery of a
packet to the overhead processing part. In addition, the signaling
manager tsib16060 may deliver signaling information for control to
a scheduler tsib16020.
[0515] General signaling information, which is not received through
a separate particular channel, may be received through the DP for
signaling tsib16070. Here, the DP for signaling may refer to PLS,
L1, etc. Here, the DP may be referred to as a PLP. A reception
buffer tsib16080 may function as a buffer that receives signaling
information delivered from the DP for signaling. In a decapsulation
block for signaling information tsib16090, the received signaling
information may be decapsulated. The decapsulated signaling
information may be delivered to the signaling manager tsib16060
through a decapsulation buffer tsib16100. As described in the
foregoing, the signaling manager tsib16060 may collate signaling
information, and deliver the collated signaling information to a
necessary part in the link layer.
[0516] The scheduler tsib16020 may determine and control operations
of several modules included in the link layer. The scheduler
tsib16020 may control each part of the link layer using receiver
information tsib16010 and/or information delivered from the
signaling manager tsib16060. In addition, the scheduler tsib16020
may determine an operation mode, etc. of each part. Here, the
receiver information tsib16010 may refer to information previously
stored in the receiver. The scheduler tsib16020 may use information
changed by a user such as channel switching, etc. to perform a
control operation.
[0517] The decapsulation part may filter a packet received from a
DP tsib16110 of the physical layer, and separate a packet according
to a type of the packet. It is possible to configure decapsulation
parts corresponding to the number of DPs that can be simultaneously
decoded in the physical layer.
[0518] The decapsulation buffer tsib16100 may function as a buffer
that receives a packet stream from the physical layer to perform
decapsulation. A decapsulation controller tsib16130 may determine
whether to decapsulate an input packet stream. When decapsulation
is performed, the packet stream may be delivered to a link layer
header parser tsib16140. When decapsulation is not performed, the
packet stream may be delivered to an output buffer tsib16220. The
signaling information received from the scheduler tsib16020 may be
used to determine whether to perform decapsulation.
[0519] The link layer header parser tsib16140 may identify a header
of the delivered link layer packet. It is possible to identify a
configuration of an IP packet included in a payload of the link
layer packet by identifying the header. For example, the IP packet
may be segmented or concatenated.
[0520] A packet configuration table tsib16150 may include payload
information of segmented and/or concatenated link layer packets.
The transmitter and the receiver may have the same information in
the packet configuration table tsib16150. The transmitter and the
receiver may refer to the information of the packet configuration
table tsib16150. It is possible to find a value necessary for
reassembly based on index information included in the link layer
packet.
[0521] A reassembly block tsib16160 may configure payloads of the
segmented and/or concatenated link layer packets as packets of an
original IP stream. Segments may be collected and reconfigured as
one IP packet, or concatenated packets may be separated and
reconfigured as a plurality of IP packet streams. Recombined IP
packets may be delivered to the overhead processing part.
[0522] The overhead processing part may perform an operation of
restoring a packet subjected to overhead reduction to an original
packet as a reverse operation of overhead reduction performed in
the transmitter. This operation may be referred to as overhead
processing. It is possible to configure overhead processing parts
corresponding to the number of DPs that can be simultaneously
decoded in the physical layer.
[0523] A packet recovery buffer tsib16170 may function as a buffer
that receives a decapsulated RoHC packet or IP packet to perform
overhead processing.
[0524] An overhead controller tsib16180 may determine whether to
recover and/or decompress the decapsulated packet. When recovery
and/or decompression are performed, the packet may be delivered to
a packet stream recovery block tsib16190. When recovery and/or
decompression are not performed, the packet may be delivered to the
output buffer tsib16220. Whether to perform recovery and/or
decompression may be determined based on the signaling information
delivered by the scheduler tsib16020.
[0525] The packet stream recovery block tsib16190 may perform an
operation of integrating a packet stream separated from the
transmitter with context information of the packet stream. This
operation may be a process of restoring a packet stream such that
an RoHC decompressor tsib16210 can perform processing. In this
process, it is possible to receive signaling information and/or
context information from a signaling and/or context controller
tsib16200. The signaling and/or context controller tsib16200 may
determine signaling information delivered from the transmitter, and
deliver the signaling information to the packet stream recovery
block tsib16190 such that the signaling information may be mapped
to a stream corresponding to a context ID.
[0526] The RoHC decompressor tsib16210 may restore headers of
packets of the packet stream. The packets of the packet stream may
be restored to forms of original IP packets through restoration of
the headers. In other words, the RoHC decompressor tsib16210 may
perform overhead processing.
[0527] The output buffer tsib16220 may function as a buffer before
an output stream is delivered to an IP layer tsib16230.
[0528] The link layers of the transmitter and the receiver proposed
in the present invention may include the blocks or modules
described above. In this way, the link layer may independently
operate irrespective of an upper layer and a lower layer, overhead
reduction may be efficiently performed, and a supportable function
according to an upper/lower layer may be easily
defined/added/deleted.
[0529] FIG. 17 illustrates a configuration of signaling
transmission through a link layer according to an embodiment of the
present invention (transmitting/receiving sides).
[0530] In the present invention, a plurality of service providers
(broadcasters) may provide services within one frequency band. In
addition, a service provider may provide a plurality of services,
and one service may include one or more components. It can be
considered that the user receives content using a service as a
unit.
[0531] The present invention presumes that a transmission protocol
based on a plurality of sessions is used to support an IP hybrid
broadcast. Signaling information delivered through a signaling path
may be determined based on a transmission configuration of each
protocol. Various names may be applied to respective protocols
according to a given embodiment.
[0532] In the illustrated data configuration tsib17010 on the
transmitting side, service providers (broadcasters) may provide a
plurality of services (Service #1, #2, . . . ). In general, a
signal for a service may be transmitted through a general
transmission session (signaling C). However, the signal may be
transmitted through a particular session (dedicated session)
according to a given embodiment (signaling B).
[0533] Service data and service signaling information may be
encapsulated according to a transmission protocol. According to a
given embodiment, an IP/UDP layer may be used. According to a given
embodiment, a signal in the IP/UDP layer (signaling A) may be
additionally provided. This signaling may be omitted.
[0534] Data processed using the IP/UDP may be input to the link
layer. As described in the foregoing, overhead reduction and/or
encapsulation may be performed in the link layer. Here, link layer
signaling may be additionally provided. Link layer signaling may
include a system parameter, etc. Link layer signaling has been
described above.
[0535] The service data and the signaling information subjected to
the above process may be processed through PLPs in a physical
layer. Here, a PLP may be referred to as a DP. The example
illustrated in the figure presumes a case in which a base DP/PLP is
used. However, depending on embodiments, transmission may be
performed using only a general DP/PLP without the base DP/PLP.
[0536] In the example illustrated in the figure, a particular
channel (dedicated channel) such as an FIC, an EAC, etc. is used. A
signal delivered through the FIC may be referred to as a fast
information table (FIT), and a signal delivered through the EAC may
be referred to as an emergency alert table (EAT). The FIT may be
identical to the above-described SLT. The particular channels may
not be used depending on embodiments. When the particular channel
(dedicated channel) is not configured, the FIT and the EAT may be
transmitted using a general link layer signaling transmission
scheme, or transmitted using a PLP via the IP/UDP as other service
data.
[0537] According to a given embodiment, system parameters may
include a transmitter-related parameter, a service provider-related
parameter, etc. Link layer signaling may include IP header
compression-related context information and/or identification
information of data to which the context is applied. Signaling of
an upper layer may include an IP address, a UDP number,
service/component information, emergency alert-related information,
an IP/UDP address for service signaling, a session ID, etc.
Detailed examples thereof have been described above.
[0538] In the illustrated data configuration tsib17020 on the
receiving side, the receiver may decode only a PLP for a
corresponding service using signaling information without having to
decode all PLPs.
[0539] First, when the user selects or changes a service desired to
be received, the receiver may be tuned to a corresponding frequency
and may read receiver information related to a corresponding
channel stored in a DB, etc. The information stored in the DB, etc.
of the receiver may be configured by reading an SLT at the time of
initial channel scan.
[0540] After receiving the SLT and the information about the
corresponding channel, information previously stored in the DB is
updated, and information about a transmission path of the service
selected by the user and information about a path, through which
component information is acquired or a signal necessary to acquire
the information is transmitted, are acquired. When the information
is not determined to be changed using version information of the
SLT, decoding or parsing may be omitted.
[0541] The receiver may verify whether SLT information is included
in a PLP by parsing physical signaling of the PLP in a
corresponding broadcast stream (not illustrated), which may be
indicated through a particular field of physical signaling. It is
possible to access a position at which a service layer signal of a
particular service is transmitted by accessing the SLT information.
The service layer signal may be encapsulated into the IP/UDP and
delivered through a transmission session. It is possible to acquire
information about a component included in the service using this
service layer signaling. A specific SLT-SLS configuration is as
described above.
[0542] In other words, it is possible to acquire transmission path
information, for receiving upper layer signaling information
(service signaling information) necessary to receive the service,
corresponding to one of several packet streams and PLPs currently
transmitted on a channel using the SLT. The transmission path
information may include an IP address, a UDP port number, a session
ID, a PLP ID, etc. Here, depending on embodiments, a value
previously designated by the IANA or a system may be used as an
IP/UDP address. The information may be acquired using a scheme of
accessing a DB or a shared memory, etc.
[0543] When the link layer signal and service data are transmitted
through the same PLP, or only one PLP is operated, service data
delivered through the PLP may be temporarily stored in a device
such as a buffer, etc. while the link layer signal is decoded.
[0544] It is possible to acquire information about a path through
which the service is actually transmitted using service signaling
information of a service to be received. In addition, a received
packet stream may be subjected to decapsulation and header recovery
using information such as overhead reduction for a PLP to be
received, etc.
[0545] In the illustrated example (tsib17020), the FIC and the EAC
are used, and a concept of the base DP/PLP is presumed. As
described in the foregoing, concepts of the FIC, the EAC, and the
base DP/PLP may not be used.
[0546] While MISO or MIMO uses two antennas in the following for
convenience of description, the present invention is applicable to
systems using two or more antennas. The present invention proposes
a physical profile (or system) optimized to minimize receiver
complexity while attaining the performance required for a
particular use case. Physical (PHY) profiles (base, handheld and
advanced profiles) according to an embodiment of the present
invention are subsets of all configurations that a corresponding
receiver should implement. The PHY profiles share most of the
functional blocks but differ slightly in specific blocks and/or
parameters. For the system evolution, future profiles may also be
multiplexed with existing profiles in a single radio frequency (RF)
channel through a future extension frame (FEF). The base profile
and the handheld profile according to the embodiment of the present
invention refer to profiles to which MIMO is not applied, and the
advanced profile refers to a profile to which MIMO is applied. The
base profile may be used as a profile for both the terrestrial
broadcast service and the mobile broadcast service. That is, the
base profile may be used to define a concept of a profile which
includes the mobile profile. In addition, the advanced profile may
be divided into an advanced profile for a base profile with MIMO
and an advanced profile for a handheld profile with MIMO. Moreover,
the profiles may be changed according to intention of the
designer.
[0547] The following terms and definitions may be applied to the
present invention. The following terms and definitions may be
changed according to design.
[0548] Auxiliary stream: sequence of cells carrying data of as yet
undefined modulation and coding, which may be used for future
extensions or as required by broadcasters or network operators.
[0549] Base data pipe: data pipe that carries service signaling
data.
[0550] Baseband frame (or BBFRAME): set of Kbch bits which form the
input to one FEC encoding process (BCH and LDPC encoding).
[0551] Cell: modulation value that is carried by one carrier of
orthogonal frequency division multiplexing (OFDM) transmission.
[0552] Coded block: LDPC-encoded block of PLS1 data or one of the
LDPC-encoded blocks of PLS2 data.
[0553] Data pipe: logical channel in the physical layer that
carries service data or related metadata, which may carry one or a
plurality of service(s) or service component(s).
[0554] Data pipe unit (DPU): a basic unit for allocating data cells
to a DP in a frame.
[0555] Data symbol: OFDM symbol in a frame which is not a preamble
symbol (the data symbol encompasses the frame signaling symbol and
frame edge symbol).
[0556] DP_ID: this 8-bit field identifies uniquely a DP within the
system identified by the SYSTEM_ID.
[0557] Dummy cell: cell carrying a pseudo-random value used to fill
the remaining capacity not used for PLS signaling, DPs or auxiliary
streams.
[0558] Emergency alert channel (EAC): part of a frame that carries
EAS information data.
[0559] Frame: physical layer time slot that starts with a preamble
and ends with a frame edge symbol.
[0560] Frame repetition unit: a set of frames belonging to the same
or different physical layer profiles including an FEF, which is
repeated eight times in a superframe.
[0561] Fast information channel (FIC): a logical channel in a frame
that carries mapping information between a service and the
corresponding base DP.
[0562] FECBLOCK: set of LDPC-encoded bits of DP data.
[0563] FFT size: nominal FFT size used for a particular mode, equal
to the active symbol period Ts expressed in cycles of an elementary
period T.
[0564] Frame signaling symbol: OFDM symbol with higher pilot
density used at the start of a frame in certain combinations of FFT
size, guard interval and scattered pilot pattern, which carries a
part of the PLS data.
[0565] Frame edge symbol: OFDM symbol with higher pilot density
used at the end of a frame in certain combinations of FFT size,
guard interval and scattered pilot pattern.
[0566] Frame group: the set of all frames having the same PHY
profile type in a superframe.
[0567] Future extension frame: physical layer time slot within the
superframe that may be used for future extension, which starts with
a preamble.
[0568] Futurecast UTB system: proposed physical layer broadcast
system, the input of which is one or more MPEG2-TS, IP or general
stream(s) and the output of which is an RF signal.
[0569] Input stream: a stream of data for an ensemble of services
delivered to the end users by the system.
[0570] Normal data symbol: data symbol excluding the frame
signaling symbol and the frame edge symbol.
[0571] PHY profile: subset of all configurations that a
corresponding receiver should implement.
[0572] PLS: physical layer signaling data including PLS1 and
PLS2.
[0573] PLS1: a first set of PLS data carried in a frame signaling
symbol (FSS) having a fixed size, coding and modulation, which
carries basic information about a system as well as parameters
needed to decode PLS2.
[0574] NOTE: PLS1 data remains constant for the duration of a frame
group.
[0575] PLS2: a second set of PLS data transmitted in the FSS, which
carries more detailed PLS data about the system and the DPs.
[0576] PLS2 dynamic data: PLS2 data that dynamically changes
frame-by-frame.
[0577] PLS2 static data: PLS2 data that remains static for the
duration of a frame group.
[0578] Preamble signaling data: signaling data carried by the
preamble symbol and used to identify the basic mode of the
system.
[0579] Preamble symbol: fixed-length pilot symbol that carries
basic PLS data and is located at the beginning of a frame.
[0580] The preamble symbol is mainly used for fast initial band
scan to detect the system signal, timing thereof, frequency offset,
and FFT size.
[0581] Reserved for future use: not defined by the present document
but may be defined in future.
[0582] Superframe: set of eight frame repetition units.
[0583] Time interleaving block (TI block): set of cells within
which time interleaving is carried out, corresponding to one use of
a time interleaver memory.
[0584] TI group: unit over which dynamic capacity allocation for a
particular DP is carried out, made up of an integer, dynamically
varying number of XFECBLOCKs.
[0585] NOTE: The TI group may be mapped directly to one frame or
may be mapped to a plurality of frames. The TI group may contain
one or more TI blocks.
[0586] Type 1 DP: DP of a frame where all DPs are mapped to the
frame in time division multiplexing (TDM) scheme.
[0587] Type 2 DP: DP of a frame where all DPs are mapped to the
frame in frequency division multiplexing (FDM) scheme.
[0588] XFECBLOCK: set of N.sub.cells cells carrying all the bits of
one LDPC FECBLOCK.
[0589] FIG. 18 illustrates a configuration of a broadcast signal
transmission apparatus for future broadcast services according to
an embodiment of the present invention.
[0590] The broadcast signal transmission apparatus for future
broadcast services according to the present embodiment may include
an input formatting block 1000, a bit interleaved coding &
modulation (BICM) block 1010, a frame building block 1020, an OFDM
generation block 1030 and a signaling generation block 1040.
Description will be given of an operation of each block of the
broadcast signal transmission apparatus.
[0591] In input data according to an embodiment of the present
invention, IP stream/packets and MPEG2-TS may be main input
formats, and other stream types are handled as general streams. In
addition to these data inputs, management information is input to
control scheduling and allocation of the corresponding bandwidth
for each input stream. In addition, the present invention allows
simultaneous input of one or a plurality of TS streams, IP
stream(s) and/or a general stream(s).
[0592] The input formatting block 1000 may demultiplex each input
stream into one or a plurality of data pipes, to each of which
independent coding and modulation are applied. A DP is the basic
unit for robustness control, which affects QoS. One or a plurality
of services or service components may be carried by one DP. The DP
is a logical channel in a physical layer for delivering service
data or related metadata capable of carrying one or a plurality of
services or service components.
[0593] In addition, a DPU is a basic unit for allocating data cells
to a DP in one frame.
[0594] An input to the physical layer may include one or a
plurality of data streams. Each of the data streams is delivered by
one DP. The input formatting block 1000 may covert a data stream
input through one or more physical paths (or DPs) into a baseband
frame (BBF). In this case, the input formatting block 1000 may
perform null packet deletion or header compression on input data (a
TS or IP input stream) in order to enhance transmission efficiency.
A receiver may have a priori information for a particular part of a
header, and thus this known information may be deleted from a
transmitter. A null packet deletion block 3030 may be used only for
a TS input stream.
[0595] In the BICM block 1010, parity data is added for error
correction and encoded bit streams are mapped to complex-value
constellation symbols. The symbols are interleaved across a
specific interleaving depth that is used for the corresponding DP.
For the advanced profile, MIMO encoding is performed in the BICM
block 1010 and an additional data path is added at the output for
MIMO transmission.
[0596] The frame building block 1020 may map the data cells of the
input DPs into the OFDM symbols within a frame, and perform
frequency interleaving for frequency-domain diversity, especially
to combat frequency-selective fading channels. The frame building
block 1020 may include a delay compensation block, a cell mapper
and a frequency interleaver.
[0597] The delay compensation block may adjust timing between DPs
and corresponding PLS data to ensure that the DPs and the
corresponding PLS data are co-timed at a transmitter side. The PLS
data is delayed by the same amount as the data pipes by addressing
the delays of data pipes caused by the input formatting block and
BICM block. The delay of the BICM block is mainly due to the time
interleaver. In-band signaling data carries information of the next
TI group so that the information is carried one frame ahead of the
DPs to be signaled. The delay compensation block delays in-band
signaling data accordingly.
[0598] The cell mapper may map PLS, DPs, auxiliary streams, dummy
cells, etc. to active carriers of the OFDM symbols in the frame.
The basic function of the cell mapper 7010 is to map data cells
produced by the TIs for each of the DPs, PLS cells, and EAC/FIC
cells, if any, into arrays of active OFDM cells corresponding to
each of the OFDM symbols within a frame. A basic function of the
cell mapper is to map a data cell generated by time interleaving
for each DP and PLS cell to an array of active OFDM cells (if
present) corresponding to respective OFDM symbols in one frame.
Service signaling data (such as program specific information
(PSI)/SI) may be separately gathered and sent by a DP. The cell
mapper operates according to dynamic information produced by a
scheduler and the configuration of a frame structure. The frequency
interleaver may randomly interleave data cells received from the
cell mapper to provide frequency diversity. In addition, the
frequency interleaver may operate on an OFDM symbol pair including
two sequential OFDM symbols using a different interleaving-seed
order to obtain maximum interleaving gain in a single frame.
[0599] The OFDM generation block 1030 modulates OFDM carriers by
cells produced by the frame building block, inserts pilots, and
produces a time domain signal for transmission. In addition, this
block subsequently inserts guard intervals, and applies
peak-to-average power ratio (PAPR) reduction processing to produce
a final RF signal.
[0600] Specifically, after inserting a preamble at the beginning of
each frame, the OFDM generation block 1030 may apply conventional
OFDM modulation having a cyclic prefix as a guard interval. For
antenna space diversity, a distributed MISO scheme is applied
across transmitters. In addition, a PAPR scheme is performed in the
time domain. For flexible network planning, the present invention
provides a set of various FFT sizes, guard interval lengths and
corresponding pilot patterns.
[0601] In addition, the present invention may multiplex signals of
a plurality of broadcast transmission/reception systems in the time
domain such that data of two or more different broadcast
transmission/reception systems providing broadcast services may be
simultaneously transmitted in the same RF signal bandwidth. In this
case, the two or more different broadcast transmission/reception
systems refer to systems providing different broadcast services.
The different broadcast services may refer to a terrestrial
broadcast service, mobile broadcast service, etc.
[0602] The signaling generation block 1040 may create physical
layer signaling information used for an operation of each
functional block. This signaling information is also transmitted so
that services of interest are properly recovered at a receiver
side. Signaling information according to an embodiment of the
present invention may include PLS data. PLS provides the receiver
with a means to access physical layer DPs. The PLS data includes
PLS1 data and PLS2 data.
[0603] The PLS1 data is a first set of PLS data carried in an FSS
symbol in a frame having a fixed size, coding and modulation, which
carries basic information about the system in addition to the
parameters needed to decode the PLS2 data. The PLS1 data provides
basic transmission parameters including parameters required to
enable reception and decoding of the PLS2 data. In addition, the
PLS1 data remains constant for the duration of a frame group.
[0604] The PLS2 data is a second set of PLS data transmitted in an
FSS symbol, which carries more detailed PLS data about the system
and the DPs. The PLS2 contains parameters that provide sufficient
information for the receiver to decode a desired DP. The PLS2
signaling further includes two types of parameters, PLS2 static
data (PLS2-STAT data) and PLS2 dynamic data (PLS2-DYN data). The
PLS2 static data is PLS2 data that remains static for the duration
of a frame group and the PLS2 dynamic data is PLS2 data that
dynamically changes frame by frame. Details of the PLS data will be
described later.
[0605] The above-described blocks may be omitted or replaced by
blocks having similar or identical functions.
[0606] FIG. 19 illustrates a BICM block according to an embodiment
of the present invention.
[0607] The BICM block illustrated in FIG. 19 corresponds to an
embodiment of the BICM block 1010 described with reference to FIG.
18.
[0608] As described above, the broadcast signal transmission
apparatus for future broadcast services according to the embodiment
of the present invention may provide a terrestrial broadcast
service, mobile broadcast service, UHDTV service, etc.
[0609] Since QoS depends on characteristics of a service provided
by the broadcast signal transmission apparatus for future broadcast
services according to the embodiment of the present invention, data
corresponding to respective services needs to be processed using
different schemes. Accordingly, the BICM block according to the
embodiment of the present invention may independently process
respective DPs by independently applying SISO, MISO and MIMO
schemes to data pipes respectively corresponding to data paths.
Consequently, the broadcast signal transmission apparatus for
future broadcast services according to the embodiment of the
present invention may control QoS for each service or service
component transmitted through each DP.
[0610] (a) shows a BICM block applied to a profile (or system) to
which MIMO is not applied, and (b) shows a BICM block of a profile
(or system) to which MIMO is applied.
[0611] The BICM block to which MIMO is not applied and the BICM
block to which MIMO is applied may include a plurality of
processing blocks for processing each DP.
[0612] Description will be given of each processing block of the
BICM block to which MIMO is not applied and the BICM block to which
MIMO is applied.
[0613] A processing block 5000 of the BICM block to which MIMO is
not applied may include a data FEC encoder 5010, a bit interleaver
5020, a constellation mapper 5030, a signal space diversity (SSD)
encoding block 5040 and a time interleaver 5050.
[0614] The data FEC encoder 5010 performs FEC encoding on an input
BBF to generate FECBLOCK procedure using outer coding (BCH) and
inner coding (LDPC). The outer coding (BCH) is optional coding
method. A detailed operation of the data FEC encoder 5010 will be
described later.
[0615] The bit interleaver 5020 may interleave outputs of the data
FEC encoder 5010 to achieve optimized performance with a
combination of LDPC codes and a modulation scheme while providing
an efficiently implementable structure. A detailed operation of the
bit interleaver 5020 will be described later.
[0616] The constellation mapper 5030 may modulate each cell word
from the bit interleaver 5020 in the base and the handheld
profiles, or each cell word from the cell-word demultiplexer 5010-1
in the advanced profile using either QPSK, QAM-16, non-uniform QAM
(NUQ-64, NUQ-256, or NUQ-1024) or non-uniform constellation
(NUC-16, NUC-64, NUC-256, or NUC-1024) mapping to give a
power-normalized constellation point, e.sub.1. This constellation
mapping is applied only for DPs. It is observed that QAM-16 and
NUQs are square shaped, while NUCs have arbitrary shapes. When each
constellation is rotated by any multiple of 90 degrees, the rotated
constellation exactly overlaps with its original one. This
"rotation-sense" symmetric property makes the capacities and the
average powers of the real and imaginary components equal to each
other. Both NUQs and NUCs are defined specifically for each code
rate and the particular one used is signaled by the parameter DP
MOD filed in the PLS2 data.
[0617] The time interleaver 5050 may operates at a DP level.
Parameters of time interleaving (TI) may be set differently for
each DP. A detailed operation of the time interleaver 5050 will be
described later.
[0618] A processing block 5000-1 of the BICM block to which MIMO is
applied may include the data FEC encoder, the bit interleaver, the
constellation mapper, and the time interleaver.
[0619] However, the processing block 5000-1 is distinguished from
the processing block 5000 of the BICM block to which MIMO is not
applied in that the processing block 5000-1 further includes a
cell-word demultiplexer 5010-1 and a MIMO encoding block
5020-1.
[0620] In addition, operations of the data FEC encoder, the bit
interleaver, the constellation mapper, and the time interleaver in
the processing block 5000-1 correspond to those of the data FEC
encoder 5010, the bit interleaver 5020, the constellation mapper
5030, and the time interleaver 5050 described above, and thus
description thereof is omitted.
[0621] The cell-word demultiplexer 5010-1 is used for a DP of the
advanced profile to divide a single cell-word stream into dual
cell-word streams for MIMO processing.
[0622] The MIMO encoding block 5020-1 may process an output of the
cell-word demultiplexer 5010-1 using a MIMO encoding scheme. The
MIMO encoding scheme is optimized for broadcast signal
transmission. MIMO technology is a promising way to obtain a
capacity increase but depends on channel characteristics.
Especially for broadcasting, a strong LOS component of a channel or
a difference in received signal power between two antennas caused
by different signal propagation characteristics makes it difficult
to obtain capacity gain from MIMO. The proposed MIMO encoding
scheme overcomes this problem using rotation-based precoding and
phase randomization of one of MIMO output signals.
[0623] MIMO encoding is intended for a 2.times.2 MIMO system
requiring at least two antennas at both the transmitter and the
receiver. A MIMO encoding mode of the present invention may be
defined as full-rate spatial multiplexing (FR-SM). FR-SM encoding
may provide capacity increase with relatively small complexity
increase at the receiver side. In addition, the MIMO encoding
scheme of the present invention has no restriction on an antenna
polarity configuration.
[0624] MIMO processing is applied at the DP level. NUQ (e.sub.1,i
and e.sub.2,i) corresponding to a pair of constellation mapper
outputs is fed to an input of a MIMO encoder. Paired MIMO encoder
output (g1,i and g2,i) is transmitted by the same carrier k and
OFDM symbol l of respective TX antennas thereof.
[0625] The above-described blocks may be omitted or replaced by
blocks having similar or identical functions.
[0626] FIG. 20 illustrates a BICM block according to another
embodiment of the present invention.
[0627] The BICM block illustrated in FIG. 20 corresponds to another
embodiment of the BICM block 1010 described with reference to FIG.
18.
[0628] FIG. 20 illustrates a BICM block for protection of physical
layer signaling (PLS), an emergency alert channel (EAC) and a fast
information channel (FIC). The EAC is a part of a frame that
carries EAS information data, and the FIC is a logical channel in a
frame that carries mapping information between a service and a
corresponding base DP. Details of the EAC and FIC will be described
later.
[0629] Referring to FIG. 20, the BICM block for protection of the
PLS, the EAC and the FIC may include a PLS FEC encoder 6000, a bit
interleaver 6010 and a constellation mapper 6020.
[0630] In addition, the PLS FEC encoder 6000 may include a
scrambler, a BCH encoding/zero insertion block, an LDPC encoding
block and an LDPC parity punturing block. Description will be given
of each block of the BICM block.
[0631] The PLS FEC encoder 6000 may encode scrambled PLS 1/2 data,
EAC and FIC sections.
[0632] The scrambler may scramble PLS1 data and PLS2 data before
BCH encoding and shortened and punctured LDPC encoding.
[0633] The BCH encoding/zero insertion block may perform outer
encoding on the scrambled PLS 1/2 data using a shortened BCH code
for PLS protection, and insert zero bits after BCH encoding. For
PLS1 data only, output bits of zero insertion may be permutted
before LDPC encoding.
[0634] The LDPC encoding block may encode an output of the BCH
encoding/zero insertion block using an LDPC code. To generate a
complete coded block, C.sub.ldpc and parity bits P.sub.ldpc are
encoded systematically from each zero-inserted PLS information
block I.sub.ldpc and appended thereto.
C.sub.ldpc=[I.sub.ldpcP.sub.ldpc]=[i.sub.0,i.sub.1, . . .
,i.sub.K.sub.ldpc.sub.-1,p.sub.0,p.sub.1, . . .
,p.sub.N.sub.ldpc.sub.-K.sub.ldpc.sub.-1] [Equation 1]
[0635] The LDPC parity punturing block may perform puncturing on
the PLS1 data and the PLS2 data.
[0636] When shortening is applied to PLS1 data protection, some
LDPC parity bits are punctured after LDPC encoding. In addition,
for PLS2 data protection, LDPC parity bits of PLS2 are punctured
after LDPC encoding. These punctured bits are not transmitted.
[0637] The bit interleaver 6010 may interleave each of shortened
and punctured PLS1 data and PLS2 data.
[0638] The constellation mapper 6020 may map the bit-ineterlaeved
PLS1 data and PLS2 data to constellations.
[0639] The above-described blocks may be omitted or replaced by
blocks having similar or identical functions.
[0640] FIG. 21 illustrates a bit interleaving process of PLS
according to an embodiment of the present invention.
[0641] Each shortened and punctured PLS1 and PLS2 coded block is
interleaved bit-by-bit as described in FIG. 22. Each block of
additional parity bits is interleaved with the same block
interleaving structure but separately.
[0642] In the case of BPSK, there are two branches for bit
interleaving to duplicate FEC coded bits in the real and imaginary
parts. Each coded block is written to the upper branch first. The
bits are mapped to the lower branch by applying modulo N.sub.FEC
addition with cyclic shifting value floor(N.sub.FEC/2), where
N.sub.FEC is the length of each LDPC coded block after shortening
and puncturing.
[0643] In other modulation cases, such as QSPK, QAM-16 and NUQ-64,
FEC coded bits are written serially into the interleaver
column-wise, where the number of columns is the same as the
modulation order.
[0644] In the read operation, the bits for one constellation symbol
are read out sequentially row-wise and fed into the bit
demultiplexer block. These operations are continued until the end
of the column.
[0645] Each bit interleaved group is demultiplexed bit-by-bit in a
group before constellation mapping. Depending on modulation order,
there are two mapping rules. In the case of BPSK and QPSK, the
reliability of bits in a symbol is equal. Therefore, the bit group
read out from the bit interleaving block is mapped to a QAM symbol
without any operation.
[0646] In the cases of QAM-16 and NUQ-64 mapped to a QAM symbol,
the rule of operation is described in FIG. 23(a). As shown in FIG.
23(a), i is bit group index corresponding to column index in bit
interleaving.
[0647] FIG. 21 shows the bit demultiplexing rule for QAM-16. This
operation continues until all bit groups are read from the bit
interleaving block.
[0648] FIG. 22 illustrates a configuration of a broadcast signal
reception apparatus for future broadcast services according to an
embodiment of the present invention.
[0649] The broadcast signal reception apparatus for future
broadcast services according to the embodiment of the present
invention may correspond to the broadcast signal transmission
apparatus for future broadcast services described with reference to
FIG. 18.
[0650] The broadcast signal reception apparatus for future
broadcast services according to the embodiment of the present
invention may include a synchronization & demodulation module
9000, a frame parsing module 9010, a demapping & decoding
module 9020, an output processor 9030 and a signaling decoding
module 9040. A description will be given of operation of each
module of the broadcast signal reception apparatus.
[0651] The synchronization & demodulation module 9000 may
receive input signals through m Rx antennas, perform signal
detection and synchronization with respect to a system
corresponding to the broadcast signal reception apparatus, and
carry out demodulation corresponding to a reverse procedure of a
procedure performed by the broadcast signal transmission
apparatus.
[0652] The frame parsing module 9010 may parse input signal frames
and extract data through which a service selected by a user is
transmitted. If the broadcast signal transmission apparatus
performs interleaving, the frame parsing module 9010 may carry out
deinterleaving corresponding to a reverse procedure of
interleaving. In this case, positions of a signal and data that
need to be extracted may be obtained by decoding data output from
the signaling decoding module 9040 to restore scheduling
information generated by the broadcast signal transmission
apparatus.
[0653] The demapping & decoding module 9020 may convert input
signals into bit domain data and then deinterleave the same as
necessary. The demapping & decoding module 9020 may perform
demapping of mapping applied for transmission efficiency and
correct an error generated on a transmission channel through
decoding. In this case, the demapping & decoding module 9020
may obtain transmission parameters necessary for demapping and
decoding by decoding data output from the signaling decoding module
9040.
[0654] The output processor 9030 may perform reverse procedures of
various compression/signal processing procedures which are applied
by the broadcast signal transmission apparatus to improve
transmission efficiency. In this case, the output processor 9030
may acquire necessary control information from data output from the
signaling decoding module 9040. An output of the output processor
9030 corresponds to a signal input to the broadcast signal
transmission apparatus and may be MPEG-TSs, IP streams (v4 or v6)
and generic streams.
[0655] The signaling decoding module 9040 may obtain PLS
information from a signal demodulated by the synchronization &
demodulation module 9000. As described above, the frame parsing
module 9010, the demapping & decoding module 9020 and the
output processor 9030 may execute functions thereof using data
output from the signaling decoding module 9040.
[0656] A frame according to an embodiment of the present invention
is further divided into a number of OFDM symbols and a preamble. As
shown in (d), the frame includes a preamble, one or more frame
signaling symbols (FSSs), normal data symbols and a frame edge
symbol (FES).
[0657] The preamble is a special symbol that enables fast
futurecast UTB system signal detection and provides a set of basic
transmission parameters for efficient transmission and reception of
a signal. Details of the preamble will be described later.
[0658] A main purpose of the FSS is to carry PLS data. For fast
synchronization and channel estimation, and hence fast decoding of
PLS data, the FSS has a dense pilot pattern than a normal data
symbol. The FES has exactly the same pilots as the FSS, which
enables frequency-only interpolation within the FES and temporal
interpolation, without extrapolation, for symbols immediately
preceding the FES.
[0659] FIG. 23 illustrates a signaling hierarchy structure of a
frame according to an embodiment of the present invention.
[0660] FIG. 23 illustrates the signaling hierarchy structure, which
is split into three main parts corresponding to preamble signaling
data 11000, PLS1 data 11010 and PLS2 data 11020. A purpose of a
preamble, which is carried by a preamble symbol in every frame, is
to indicate a transmission type and basic transmission parameters
of the frame. PLS1 enables the receiver to access and decode the
PLS2 data, which contains the parameters to access a DP of
interest. PLS2 is carried in every frame and split into two main
parts corresponding to PLS2-STAT data and PLS2-DYN data. Static and
dynamic portions of PLS2 data are followed by padding, if
necessary.
[0661] Preamble signaling data according to an embodiment of the
present invention carries 21 bits of information that are needed to
enable the receiver to access PLS data and trace DPs within the
frame structure. Details of the preamble signaling data are as
follows.
[0662] FFT_SIZE: This 2-bit field indicates an FFT size of a
current frame within a frame group as described in the following
Table 1.
TABLE-US-00001 TABLE 1 Value FFT size 00 8K FFT 01 16K FFT 10 32K
FFT 11 Reserved
[0663] GI_FRACTION: This 3-bit field indicates a guard interval
fraction value in a current superframe as described in the
following Table 2.
TABLE-US-00002 TABLE 2 Value GI_FRACTION 000 1/5 001 1/10 010 1/20
011 1/40 100 1/80 101 1/160 110 to 111 Reserved
[0664] EAC_FLAG: This 1-bit field indicates whether the EAC is
provided in a current frame. If this field is set to `1`, an
emergency alert service (EAS) is provided in the current frame. If
this field set to `0`, the EAS is not carried in the current frame.
This field may be switched dynamically within a superframe.
[0665] PILOT_MODE: This 1-bit field indicates whether a pilot mode
is a mobile mode or a fixed mode for a current frame in a current
frame group. If this field is set to `0`, the mobile pilot mode is
used. If the field is set to `1`, the fixed pilot mode is used.
[0666] PAPR_FLAG: This 1-bit field indicates whether PAPR reduction
is used for a current frame in a current frame group. If this field
is set to a value of `1`, tone reservation is used for PAPR
reduction. If this field is set to a value of `0`, PAPR reduction
is not used.
[0667] RESERVED: This 7-bit field is reserved for future use.
[0668] FIG. 24 illustrates PLS1 data according to an embodiment of
the present invention.
[0669] PLS1 data provides basic transmission parameters including
parameters required to enable reception and decoding of PLS2. As
mentioned above, the PLS1 data remain unchanged for the entire
duration of one frame group. A detailed definition of the signaling
fields of the PLS1 data is as follows.
[0670] PREAMBLE_DATA: This 20-bit field is a copy of preamble
signaling data excluding EAC_FLAG.
[0671] NUM_FRAME_FRU: This 2-bit field indicates the number of the
frames per FRU.
[0672] PAYLOAD_TYPE: This 3-bit field indicates a format of payload
data carried in a frame group. PAYLOAD_TYPE is signaled as shown in
Table 3.
TABLE-US-00003 TABLE 3 Value Payload type 1XX TS is transmitted.
X1X IP stream is transmitted. XX1 GS is transmitted.
[0673] NUM_FSS: This 2-bit field indicates the number of FSSs in a
current frame.
[0674] SYSTEM_VERSION: This 8-bit field indicates a version of a
transmitted signal format. SYSTEM_VERSION is divided into two 4-bit
fields: a major version and a minor version.
[0675] Major version: The MSB corresponding to four bits of the
SYSTEM_VERSION field indicate major version information. A change
in the major version field indicates a non-backward-compatible
change. A default value is `0000`. For a version described in this
standard, a value is set to `0000`.
[0676] Minor version: The LSB corresponding to four bits of
SYSTEM_VERSION field indicate minor version information. A change
in the minor version field is backwards compatible.
[0677] CELL_ID: This is a 16-bit field which uniquely identifies a
geographic cell in an ATSC network. An ATSC cell coverage area may
include one or more frequencies depending on the number of
frequencies used per futurecast UTB system. If a value of CELL_ID
is not known or unspecified, this field is set to `0`.
[0678] NETWORK_ID: This is a 16-bit field which uniquely identifies
a current ATSC network.
[0679] SYSTEM_ID: This 16-bit field uniquely identifies the
futurecast UTB system within the ATSC network. The futurecast UTB
system is a terrestrial broadcast system whose input is one or more
input streams (TS, IP, GS) and whose output is an RF signal. The
futurecast UTB system carries one or more PHY profiles and FEF, if
any. The same futurecast UTB system may carry different input
streams and use different RFs in different geographical areas,
allowing local service insertion. The frame structure and
scheduling are controlled in one place and are identical for all
transmissions within the futurecast UTB system. One or more
futurecast UTB systems may have the same SYSTEM_ID meaning that
they all have the same physical layer structure and
configuration.
[0680] The following loop includes FRU_PHY_PROFILE,
FRU_FRAME_LENGTH, FRU_GI_FRACTION, and RESERVED which are used to
indicate an FRU configuration and a length of each frame type. A
loop size is fixed so that four PHY profiles (including an FEF) are
signaled within the FRU. If NUM_FRAME_FRU is less than 4, unused
fields are filled with zeros.
[0681] FRU_PHY_PROFILE: This 3-bit field indicates a PHY profile
type of an (i+1).sup.th (i is a loop index) frame of an associated
FRU. This field uses the same signaling format as shown in Table
8.
[0682] FRU_FRAME_LENGTH: This 2-bit field indicates a length of an
(i+1).sup.th frame of an associated FRU. Using FRU_FRAME_LENGTH
together with FRU_GI_FRACTION, an exact value of a frame duration
may be obtained.
[0683] FRU_GI_FRACTION: This 3-bit field indicates a guard interval
fraction value of an (i+1).sup.th frame of an associated FRU.
FRU_GI_FRACTION is signaled according to Table 7.
[0684] RESERVED: This 4-bit field is reserved for future use.
[0685] The following fields provide parameters for decoding the
PLS2 data.
[0686] PLS2_FEC_TYPE: This 2-bit field indicates an FEC type used
by PLS2 protection. The FEC type is signaled according to Table 4.
Details of LDPC codes will be described later.
TABLE-US-00004 TABLE 4 Content PLS2 FEC type 00 4K-1/4 and 7K-3/10
LDPC codes 01 to 11 Reserved
[0687] PLS2_MOD: This 3-bit field indicates a modulation type used
by PLS2. The modulation type is signaled according to Table 5.
TABLE-US-00005 TABLE 5 Value PLS2_MODE 000 BPSK 001 QPSK 010 QAM-16
011 NUQ-64 100 to 111 Reserved
[0688] PLS2_SIZE_CELL: This 15-bit field indicates
C.sub.total_partial_block, a size (specified as the number of QAM
cells) of the collection of full coded blocks for PLS2 that is
carried in a current frame group. This value is constant during the
entire duration of the current frame group.
[0689] PLS2_STAT_SIZE_BIT: This 14-bit field indicates a size, in
bits, of PLS2-STAT for a current frame group. This value is
constant during the entire duration of the current frame group.
[0690] PLS2_DYN_SIZE_BIT: This 14-bit field indicates a size, in
bits, of PLS2-DYN for a current frame group. This value is constant
during the entire duration of the current frame group.
[0691] PLS2_REP_FLAG: This 1-bit flag indicates whether a PLS2
repetition mode is used in a current frame group. When this field
is set to a value of `1`, the PLS2 repetition mode is activated.
When this field is set to a value of `0`, the PLS2 repetition mode
is deactivated.
[0692] PLS2_REP_SIZE_CELL: This 15-bit field indicates
C.sub.total_partial_block, a size (specified as the number of QAM
cells) of the collection of partial coded blocks for PLS2 carried
in every frame of a current frame group, when PLS2 repetition is
used. If repetition is not used, a value of this field is equal to
0. This value is constant during the entire duration of the current
frame group.
[0693] PLS2_NEXT_FEC_TYPE: This 2-bit field indicates an FEC type
used for PLS2 that is carried in every frame of a next frame group.
The FEC type is signaled according to Table 10.
[0694] PLS2_NEXT_MOD: This 3-bit field indicates a modulation type
used for PLS2 that is carried in every frame of a next frame group.
The modulation type is signaled according to Table 11.
[0695] PLS2_NEXT_REP_FLAG: This 1-bit flag indicates whether the
PLS2 repetition mode is used in a next frame group. When this field
is set to a value of `1`, the PLS2 repetition mode is activated.
When this field is set to a value of `0`, the PLS2 repetition mode
is deactivated.
[0696] PLS2_NEXT_REP_SIZE_CELL: This 15-bit field indicates
C.sub.total_full_block, a size (specified as the number of QAM
cells) of the collection of full coded blocks for PLS2 that is
carried in every frame of a next frame group, when PLS2 repetition
is used. If repetition is not used in the next frame group, a value
of this field is equal to 0. This value is constant during the
entire duration of a current frame group.
[0697] PLS2_NEXT_REP_STAT_SIZE_BIT: This 14-bit field indicates a
size, in bits, of PLS2-STAT for a next frame group. This value is
constant in a current frame group.
[0698] PLS2_NEXT_REP_DYN_SIZE_BIT: This 14-bit field indicates the
size, in bits, of the PLS2-DYN for a next frame group. This value
is constant in a current frame group.
[0699] PLS2_AP_MODE: This 2-bit field indicates whether additional
parity is provided for PLS2 in a current frame group. This value is
constant during the entire duration of the current frame group.
Table 6 below provides values of this field. When this field is set
to a value of `00`, additional parity is not used for the PLS2 in
the current frame group.
TABLE-US-00006 TABLE 6 Value PLS2-AP mode 00 AP is not provided 01
AP1 mode 10 to 11 Reserved
[0700] PLS2_AP_SIZE_CELL: This 15-bit field indicates a size
(specified as the number of QAM cells) of additional parity bits of
PLS2. This value is constant during the entire duration of a
current frame group.
[0701] PLS2_NEXT_AP_MODE: This 2-bit field indicates whether
additional parity is provided for PLS2 signaling in every frame of
a next frame group. This value is constant during the entire
duration of a current frame group. Table 12 defines values of this
field
[0702] PLS2_NEXT_AP_SIZE_CELL: This 15-bit field indicates a size
(specified as the number of QAM cells) of additional parity bits of
PLS2 in every frame of a next frame group. This value is constant
during the entire duration of a current frame group.
[0703] RESERVED: This 32-bit field is reserved for future use.
[0704] CRC_32: A 32-bit error detection code, which is applied to
all PLS1 signaling.
[0705] FIG. 25 illustrates PLS2 data according to an embodiment of
the present invention.
[0706] FIG. 25 illustrates PLS2-STAT data of the PLS2 data. The
PLS2-STAT data is the same within a frame group, while PLS2-DYN
data provides information that is specific for a current frame.
[0707] Details of fields of the PLS2-STAT data are described
below.
[0708] FIC_FLAG: This 1-bit field indicates whether the FIC is used
in a current frame group. If this field is set to `1`, the FIC is
provided in the current frame. If this field set to `0`, the FIC is
not carried in the current frame. This value is constant during the
entire duration of a current frame group.
[0709] AUX_FLAG: This 1-bit field indicates whether an auxiliary
stream is used in a current frame group. If this field is set to
`1`, the auxiliary stream is provided in a current frame. If this
field set to `0`, the auxiliary stream is not carried in the
current frame. This value is constant during the entire duration of
current frame group.
[0710] NUM_DP: This 6-bit field indicates the number of DPs carried
within a current frame. A value of this field ranges from 1 to 64,
and the number of DPs is NUM_DP+1.
[0711] DP_ID: This 6-bit field identifies uniquely a DP within a
PHY profile.
[0712] DP_TYPE: This 3-bit field indicates a type of a DP. This is
signaled according to the following Table 7.
TABLE-US-00007 TABLE 7 Value DP Type 000 DP Type 1 001 DP Type 2
010 to 111 Reserved
[0713] DP_GROUP_ID: This 8-bit field identifies a DP group with
which a current DP is associated. This may be used by the receiver
to access DPs of service components associated with a particular
service having the same DP_GROUP_ID.
[0714] BASE_DP_ID: This 6-bit field indicates a DP carrying service
signaling data (such as PSI/SI) used in a management layer. The DP
indicated by BASE_DP_ID may be either a normal DP carrying the
service signaling data along with service data or a dedicated DP
carrying only the service signaling data.
[0715] DP_FEC_TYPE: This 2-bit field indicates an FEC type used by
an associated DP. The FEC type is signaled according to the
following Table 8.
TABLE-US-00008 TABLE 8 Value FEC_TYPE 00 16K LDPC 01 64K LDPC 10 to
11 Reserved
[0716] DP_COD: This 4-bit field indicates a code rate used by an
associated DP. The code rate is signaled according to the following
Table 9.
TABLE-US-00009 TABLE 9 Value Code rate 0000 5/15 0001 6/15 0010
7/15 0011 8/15 0100 9/15 0101 10/15 0110 11/15 0111 12/15 1000
13/15 1001 to 1111 Reserved
[0717] DP_MOD: This 4-bit field indicates modulation used by an
associated DP. The modulation is signaled according to the
following Table 10.
TABLE-US-00010 TABLE 10 Value Modulation 0000 QPSK 0001 QAM-16 0010
NUQ-64 0011 NUQ-256 0100 NUQ-1024 0101 NUC-16 0110 NUC-64 0111
NUC-256 1000 NUC-1024 1001 to 1111 Reserved
[0718] DP_SSD_FLAG: This 1-bit field indicates whether an SSD mode
is used in an associated DP. If this field is set to a value of
`1`, SSD is used. If this field is set to a value of `0`, SSD is
not used.
[0719] The following field appears only if PHY_PROFILE is equal to
`010`, which indicates the advanced profile:
[0720] DP_MIMO: This 3-bit field indicates which type of MIMO
encoding process is applied to an associated DP. A type of MIMO
encoding process is signaled according to the following Table
11.
TABLE-US-00011 Value MIMO encoding 000 FR-SM 001 FRFD-SM 010 to 111
Reserved
[0721] DP_TI_TYPE: This 1-bit field indicates a type of time
interleaving. A value of `0` indicates that one TI group
corresponds to one frame and contains one or more TI blocks. A
value of `1` indicates that one TI group is carried in more than
one frame and contains only one TI block.
[0722] DP_TI_LENGTH: The use of this 2-bit field (allowed values
are only 1, 2, 4, and 8) is determined by values set within the
DP_TI_TYPE field as follows.
[0723] If DP_TI_TYPE is set to a value of `1`, this field indicates
P.sub.I, the number of frames to which each TI group is mapped, and
one TI block is present per TI group (N.sub.TI=1). Allowed values
of P.sub.I with the 2-bit field are defined in Table 12 below.
[0724] If DP_TI_TYPE is set to a value of `0`, this field indicates
the number of TI blocks N.sub.TI per TI group, and one TI group is
present per frame (P.sub.I=1). Allowed values of P.sub.I with the
2-bit field are defined in the following Table 12.
TABLE-US-00012 TABLE 12 2-bit field P.sub.1 N.sub.TI 00 1 1 01 2 2
10 4 3 11 8 4
[0725] DP_FRAME_INTERVAL: This 2-bit field indicates a frame
interval (I.sub.JUMP) within a frame group for an associated DP and
allowed values are 1, 2, 4, and 8 (the corresponding 2-bit field is
`00`, `01`, `10`, or `11`, respectively). For DPs that do not
appear every frame of the frame group, a value of this field is
equal to an interval between successive frames. For example, if a
DP appears on frames 1, 5, 9, 13, etc., this field is set to a
value of `4`. For DPs that appear in every frame, this field is set
to a value of `1`.
[0726] DP_TI_BYPASS: This 1-bit field determines availability of
the time interleaver 5050. If time interleaving is not used for a
DP, a value of this field is set to `1`. If time interleaving is
used, the value is set to `0`.
[0727] DP_FIRST_FRAME_IDX: This 5-bit field indicates an index of a
first frame of a superframe in which a current DP occurs. A value
of DP_FIRST_FRAME_IDX ranges from 0 to 31
[0728] DP_NUM_BLOCK_MAX: This 10-bit field indicates a maximum
value of DP_NUM_BLOCKS for this DP. A value of this field has the
same range as DP_NUM_BLOCKS.
[0729] DP_PAYLOAD_TYPE: This 2-bit field indicates a type of
payload data carried by a given DP. DP_PAYLOAD_TYPE is signaled
according to the following Table 13.
TABLE-US-00013 TABLE 13 Value Payload type 00 TS 01 IP 10 GS 11
Reserved
[0730] DP_INBAND_MODE: This 2-bit field indicates whether a current
DP carries in-band signaling information. An in-band signaling type
is signaled according to the following Table 14.
TABLE-US-00014 TABLE 14 Value In-band mode 00 In-band signaling is
not carried. 01 INBAND-PLS is carried 10 INBAND-ISSY is carried 11
INBAND-PLS and INBAND-ISSY are carried
[0731] DP_PROTOCOL_TYPE: This 2-bit field indicates a protocol type
of a payload carried by a given DP. The protocol type is signaled
according to Table 15 below when input payload types are
selected.
TABLE-US-00015 TABLE 15 If DP_ If DP_ If DP_ PAYLOAD_ PAYLOAD_
PAYLOAD_ Value TYPE is TS TYPE is IP TYPE is GS 00 MPEG2-TS IPv4
(Note) 01 Reserved IPv6 Reserved 10 Reserved Reserved Reserved 11
Reserved Reserved Reserved
[0732] DP_CRC_MODE: This 2-bit field indicates whether CRC encoding
is used in an input formatting block. A CRC mode is signaled
according to the following Table 16.
TABLE-US-00016 TABLE 16 Value CRC mode 00 Not used 01 CRC-8 10
CRC-16 11 CRC-32
[0733] DNP_MODE: This 2-bit field indicates a null-packet deletion
mode used by an associated DP when DP_PAYLOAD_TYPE is set to TS
(`00`). DNP_MODE is signaled according to Table 17 below. If
DP_PAYLOAD_TYPE is not TS (`00`), DNP_MODE is set to a value of
`00`.
TABLE-US-00017 TABLE 17 Null-packet Value deletion mode 00 Not used
01 DNP-NORMAL 10 DNP-OFFSET 11 Reserved
[0734] ISSY_MODE: This 2-bit field indicates an ISSY mode used by
an associated DP when DP_PAYLOAD_TYPE is set to TS (`00`).
ISSY_MODE is signaled according to Table 18 below. If
DP_PAYLOAD_TYPE is not TS (`00`), ISSY_MODE is set to the value of
`00`.
TABLE-US-00018 TABLE 18 Value ISSY mode 00 Not used 01 ISSY-UP 10
ISSY-BBF 11 Reserved
[0735] HC_MODE_TS: This 2-bit field indicates a TS header
compression mode used by an associated DP when DP_PAYLOAD_TYPE is
set to TS (`00`). HC_MODE_TS is signaled according to the following
Table 19.
TABLE-US-00019 TABLE 19 Value Header compression mode 00 HC_MODE_TS
1 01 HC_MODE_TS 2 10 HC_MODE_TS 3 11 HC_MODE_TS 4
[0736] HC_MODE_IP: This 2-bit field indicates an IP header
compression mode when DP_PAYLOAD_TYPE is set to IP (`01`).
HC_MODE_IP is signaled according to the following Table 20.
TABLE-US-00020 TABLE 20 Value Header compression mode 00 No
compression 01 HC_MODE_IP 1 10 to 11 Reserved
[0737] PID: This 13-bit field indicates the PID number for TS
header compression when DP_PAYLOAD_TYPE is set to TS (`00`) and
HC_MODE_TS is set to `01` or `10`.
[0738] RESERVED: This 8-bit field is reserved for future use.
[0739] The following fields appear only if FIC FLAG is equal to
`1`.
[0740] FIC_VERSION: This 8-bit field indicates the version number
of the FIC.
[0741] FIC_LENGTH_BYTE: This 13-bit field indicates the length, in
bytes, of the FIC.
[0742] RESERVED: This 8-bit field is reserved for future use.
[0743] The following fields appear only if AUX_FLAG is equal to
`1`.
[0744] NUM_AUX: This 4-bit field indicates the number of auxiliary
streams. Zero means no auxiliary stream is used.
[0745] AUX_CONFIG_RFU: This 8-bit field is reserved for future
use.
[0746] AUX_STREAM_TYPE: This 4-bit is reserved for future use for
indicating a type of a current auxiliary stream.
[0747] AUX_PRIVATE_CONFIG: This 28-bit field is reserved for future
use for signaling auxiliary streams.
[0748] FIG. 26 illustrates PLS2 data according to another
embodiment of the present invention.
[0749] FIG. 26 illustrates PLS2-DYN data of the PLS2 data. Values
of the PLS2-DYN data may change during the duration of one frame
group while sizes of fields remain constant.
[0750] Details of fields of the PLS2-DYN data are as below.
[0751] FRAME_INDEX: This 5-bit field indicates a frame index of a
current frame within a superframe. An index of a first frame of the
superframe is set to `0`.
[0752] PLS_CHANGE_COUNTER: This 4-bit field indicates the number of
superframes before a configuration changes. A next superframe with
changes in the configuration is indicated by a value signaled
within this field. If this field is set to a value of `0000`, it
means that no scheduled change is foreseen. For example, a value of
`1` indicates that there is a change in the next superframe.
[0753] FIC_CHANGE_COUNTER: This 4-bit field indicates the number of
superframes before a configuration (i.e., content of the FIC)
changes. A next superframe with changes in the configuration is
indicated by a value signaled within this field. If this field is
set to a value of `0000`, it means that no scheduled change is
foreseen. For example, a value of `0001` indicates that there is a
change in the next superframe.
[0754] RESERVED: This 16-bit field is reserved for future use.
[0755] The following fields appear in a loop over NUM_DP, which
describe parameters associated with a DP carried in a current
frame.
[0756] DP_ID: This 6-bit field uniquely indicates a DP within a PHY
profile.
[0757] DP_START: This 15-bit (or 13-bit) field indicates a start
position of the first of the DPs using a DPU addressing scheme. The
DP_START field has differing length according to the PHY profile
and FFT size as shown in the following Table 21.
TABLE-US-00021 TABLE 21 PHY DP_START field size profile 64K 16K
Base 13 bits 15 bits Handheld -- 13 bits Advanced 13 bits 15
its
[0758] DP_NUM_BLOCK: This 10-bit field indicates the number of FEC
blocks in a current TI group for a current DP. A value of
DP_NUM_BLOCK ranges from 0 to 1023.
[0759] RESERVED: This 8-bit field is reserved for future use.
[0760] The following fields indicate FIC parameters associated with
the EAC.
[0761] EAC_FLAG: This 1-bit field indicates the presence of the EAC
in a current frame. This bit is the same value as EAC_FLAG in a
preamble.
[0762] EAS_WAKE_UP_VERSION_NUM: This 8-bit field indicates a
version number of a wake-up indication.
[0763] If the EAC_FLAG field is equal to `1`, the following 12 bits
are allocated to EAC LENGTH BYTE. If the EAC_FLAG field is equal to
`0`, the following 12 bits are allocated to EAC COUNTER.
[0764] EAC_LENGTH_BYTE: This 12-bit field indicates a length, in
bytes, of the EAC.
[0765] EAC_COUNTER: This 12-bit field indicates the number of
frames before a frame where the EAC arrives.
[0766] The following fields appear only if the AUX_FLAG field is
equal to `1`.
[0767] AUX_PRIVATE_DYN: This 48-bit field is reserved for future
use for signaling auxiliary streams. A meaning of this field
depends on a value of AUX_STREAM_TYPE in a configurable
PLS2-STAT.
[0768] CRC_32: A 32-bit error detection code, which is applied to
the entire PLS2.
[0769] FIG. 27 illustrates a logical structure of a frame according
to an embodiment of the present invention.
[0770] As above mentioned, the PLS, EAC, FIC, DPs, auxiliary
streams and dummy cells are mapped to the active carriers of OFDM
symbols in a frame. PLS1 and PLS2 are first mapped to one or more
FSSs. Thereafter, EAC cells, if any, are mapped to an immediately
following PLS field, followed next by FIC cells, if any. The DPs
are mapped next after the PLS or after the EAC or the FIC, if any.
Type 1 DPs are mapped first and Type 2 DPs are mapped next. Details
of types of the DPs will be described later. In some cases, DPs may
carry some special data for EAS or service signaling data. The
auxiliary streams or streams, if any, follow the DPs, which in turn
are followed by dummy cells. When the PLS, EAC, FIC, DPs, auxiliary
streams and dummy data cells are mapped all together in the above
mentioned order, i.e. the PLS, EAC, FIC, DPs, auxiliary streams and
dummy data cells, cell capacity in the frame is exactly filled.
[0771] FIG. 28 illustrates PLS mapping according to an embodiment
of the present invention.
[0772] PLS cells are mapped to active carriers of FSS(s). Depending
on the number of cells occupied by PLS, one or more symbols are
designated as FSS(s), and the number of FSS(s) N.sub.FSS is
signaled by NUM_FSS in PLS1. The FSS is a special symbol for
carrying PLS cells. Since robustness and latency are critical
issues in the PLS, the FSS(s) have higher pilot density, allowing
fast synchronization and frequency-only interpolation within the
FSS.
[0773] PLS cells are mapped to active carriers of the FSS(s) in a
top-down manner as shown in the figure. PLS1 cells are mapped first
from a first cell of a first FSS in increasing order of cell index.
PLS2 cells follow immediately after a last cell of PLS1 and mapping
continues downward until a last cell index of the first FSS. If the
total number of required PLS cells exceeds the number of active
carriers of one FSS, mapping proceeds to a next FSS and continues
in exactly the same manner as the first FSS.
[0774] After PLS mapping is completed, DPs are carried next. If an
EAC, an FIC or both are present in a current frame, the EAC and the
FIC are placed between the PLS and normal DPs.
[0775] Hereinafter, description will be given of encoding an FEC
structure according to an embodiment of the present invention. As
above mentioned, the data FEC encoder may perform FEC encoding on
an input BBF to generate an FECBLOCK procedure using outer coding
(BCH), and inner coding (LDPC). The illustrated FEC structure
corresponds to the FECBLOCK. In addition, the FECBLOCK and the FEC
structure have same value corresponding to a length of an LDPC
codeword.
[0776] As described above, BCH encoding is applied to each BBF
(K.sub.bch bits), and then LDPC encoding is applied to BCH-encoded
BBF (K.sub.ldpc bits=N.sub.bch bits).
[0777] A value of N.sub.ldpc is either 64,800 bits (long FECBLOCK)
or 16,200 bits (short FECBLOCK).
[0778] Table 22 and Table 23 below show FEC encoding parameters for
the long FECBLOCK and the short FECBLOCK, respectively.
TABLE-US-00022 TABLE 22 BCH error LDPC correction N.sub.bch- rate
N.sub.ldpc K.sub.ldpc K.sub.bch capability K.sub.bch 5/15 64800
21600 21408 12 192 6/15 25920 25728 7/15 30240 30048 8/15 34560
34368 9/15 38880 38688 10/15 43200 43008 11/15 47520 47328 12/15
51840 51648 13/15 56160 55968
TABLE-US-00023 TABLE 23 BCH error LDPC correction N.sub.bch- rate
N.sub.ldpc K.sub.ldpc K.sub.bch capability K.sub.bch 5/15 16200
5400 5232 12 168 6/15 6480 6312 7/15 7560 7392 8/15 8640 8472 9/15
9720 9552 10/15 10800 10632 11/15 11880 11712 12/15 12960 12792
13/15 14040 13872
[0779] Detailed operations of BCH encoding and LDPC encoding are as
below.
[0780] A 12-error correcting BCH code is used for outer encoding of
the BBF. A BCH generator polynomial for the short FECBLOCK and the
long FECBLOCK are obtained by multiplying all polynomials
together.
[0781] LDPC code is used to encode an output of outer BCH encoding.
To generate a completed B.sub.ldpc (FECBLOCK), P.sub.ldpc (parity
bits) is encoded systematically from each hoc (BCH--encoded BBF),
and appended to I.sub.ldpc. The completed B.sub.ldpc (FECBLOCK) is
expressed by the following Equation.
B.sub.ldpc=[I.sub.ldpcP.sub.ldpc]=[i.sub.0,i.sub.1, . . .
,i.sub.K.sub.ldpc.sub.-1,p.sub.0,p.sub.1, . . .
,p.sub.N.sub.ldpc.sub.-K.sub.ldpc.sub.-1] [Equation 2]
[0782] Parameters for the long FECBLOCK and the short FECBLOCK are
given in the above Tables 22 and 23, respectively.
[0783] A detailed procedure to calculate N.sub.ldpc-K.sub.ldpc
parity bits for the long FECBLOCK, is as follows.
[0784] 1) Initialize the parity bits
p.sub.0=p.sub.1=p.sub.2= . . .
=p.sub.N.sub.ldpc.sub.-K.sub.ldpc.sub.-1=0 [Equation 3]
[0785] 2) Accumulate a first information bit--i.sub.0, at a parity
bit address specified in a first row of addresses of a parity check
matrix. Details of the addresses of the parity check matrix will be
described later. For example, for the rate of 13/15,
p.sub.983=p.sub.983.sym.i.sub.0
p.sub.2815=p.sub.2815.sym.i.sub.0
p.sub.4837=p.sub.4837.sym.i.sub.0
p.sub.4989=p.sub.4989.sym.i.sub.0
p.sub.6138=p.sub.6138.sym.i.sub.0
p.sub.6458=p.sub.6458.sym.i.sub.0
p.sub.6921=p.sub.6921.sym.i.sub.0
p.sub.6974=p.sub.6974.sym.i.sub.0
p.sub.7572=p.sub.7272.sym.i.sub.0
p.sub.8260=p.sub.8260.sym.i.sub.0
p.sub.8496=p.sub.8496.sym.i.sub.0 [Equation 4]
[0786] 3) For the next 359 information bits, i.sub.s, s=1, 2, . . .
, 359, accumulate is at parity bit addresses using following
Equation.
{x+(s mod 360).times.Q.sub.ldpc}mod(N.sub.ldpc-K.sub.ldpc)
[Equation 5]
[0787] Here, x denotes an address of a parity bit accumulator
corresponding to a first bit i.sub.0, and Q.sub.ldpc is a code rate
dependent constant specified in the addresses of the parity check
matrix. Continuing with the example, Q.sub.ldpc=24 for the rate of
13/15, so for an information bit i.sub.1, the following operations
are performed.
p.sub.1007=p.sub.1007.sym.i.sub.1
p.sub.2839=p.sub.2839.sym.i.sub.1
p.sub.4861=p.sub.4861.sym.i.sub.1
p.sub.5013=p.sub.5013.sym.i.sub.1
p.sub.6162=p.sub.6162.sym.i.sub.1
p.sub.6482=p.sub.6482.sym.i.sub.1
p.sub.6945=p.sub.6945.sym.i.sub.1
p.sub.6998=p.sub.6998.sym.i.sub.1
p.sub.7596=p.sub.7596.sym.i.sub.1
p.sub.8284=p.sub.8284.sym.i.sub.1
p.sub.8520=p.sub.8520.sym.i.sub.1 [Equation 6]
[0788] 4) For a 361th information bit i.sub.360, an address of the
parity bit accumulator is given in a second row of the addresses of
the parity check matrix. In a similar manner, addresses of the
parity bit accumulator for the following 359 information bits
i.sub.s, s=361, 362, . . . , 719 are obtained using Equation 6,
where x denotes an address of the parity bit accumulator
corresponding to the information bit i.sub.360, i.e., an entry in
the second row of the addresses of the parity check matrix.
[0789] 5) In a similar manner, for every group of 360 new
information bits, a new row from the addresses of the parity check
matrix is used to find the address of the parity bit
accumulator.
[0790] After all of the information bits are exhausted, a final
parity bit is obtained as below.
[0791] 6) Sequentially perform the following operations starting
with i=1.
p.sub.i=p.sub.i.sym.p.sub.i-1, i=1,2, . . .
,N.sub.ldpc-K.sub.ldpc-1 [Equation 7]
[0792] Here, final content of p.sub.i (i=0, 1, . . . ,
N.sub.ldpc-K.sub.ldpc-1) is equal to a parity bit p.sub.i.
TABLE-US-00024 TABLE 24 Code rate Q.sub.ldpc 5/15 120 6/15 108 7/15
96 8/15 84 9/15 72 10/15 60 11/15 48 12/15 36 13/15 24
[0793] This LDPC encoding procedure for the short FECBLOCK is in
accordance with t LDPC encoding procedure for the long FECBLOCK,
except that Table 24 is replaced with Table 25, and the addresses
of the parity check matrix for the long FECBLOCK are replaced with
the addresses of the parity check matrix for the short
FECBLOCK.
TABLE-US-00025 TABLE 25 Code rate Q.sub.ldpc 5/15 30 6/15 27 7/15
24 8/15 21 9/15 18 10/15 15 11/15 12 12/15 9 13/15 6
[0794] FIG. 29 illustrates time interleaving according to an
embodiment of the present invention.
[0795] (a) to (c) show examples of a TI mode.
[0796] A time interleaver operates at the DP level. Parameters of
time interleaving (TI) may be set differently for each DP.
[0797] The following parameters, which appear in part of the
PLS2-STAT data, configure the TI.
[0798] DP_TI_TYPE (allowed values: 0 or 1): This parameter
represents the TI mode. The value of `0` indicates a mode with
multiple TI blocks (more than one TI block) per TI group. In this
case, one TI group is directly mapped to one frame (no inter-frame
interleaving). The value of `1` indicates a mode with only one TI
block per TI group. In this case, the TI block may be spread over
more than one frame (inter-frame interleaving).
[0799] DP_TI_LENGTH: If DP_TI_TYPE=`0`, this parameter is the
number of TI blocks N.sub.TI per TI group. For DP_TI_TYPE=`1`, this
parameter is the number of frames P.sub.I spread from one TI
group.
[0800] DP_NUM_BLOCK_MAX (allowed values: 0 to 1023): This parameter
represents the maximum number of XFECBLOCKs per TI group.
[0801] DP_FRAME_INTERVAL (allowed values: 1, 2, 4, and 8): This
parameter represents the number of the frames hump between two
successive frames carrying the same DP of a given PHY profile.
[0802] DP_TI_BYPASS (allowed values: 0 or 1): If time interleaving
is not used for a DP, this parameter is set to `1`. This parameter
is set to `0` if time interleaving is used.
[0803] Additionally, the parameter DP_NUM_BLOCK from the PLS2-DYN
data is used to represent the number of XFECBLOCKs carried by one
TI group of the DP.
[0804] When time interleaving is not used for a DP, the following
TI group, time interleaving operation, and TI mode are not
considered. However, the delay compensation block for the dynamic
configuration information from the scheduler may still be required.
In each DP, the XFECBLOCKs received from SSD/MIMO encoding are
grouped into TI groups. That is, each TI group is a set of an
integer number of XFECBLOCKs and contains a dynamically variable
number of XFECBLOCKs. The number of XFECBLOCKs in the TI group of
index n is denoted by N.sub.xBLOCK_Group(n) and is signaled as
DP_NUM_BLOCK in the PLS2-DYN data. Note that N.sub.xBLOCK_Group(n)
may vary from a minimum value of 0 to a maximum value of
N.sub.xBLOCK_Group_MAX (corresponding to DP_NUM_BLOCK_MAX), the
largest value of which is 1023.
[0805] Each TI group is either mapped directly to one frame or
spread over P.sub.I frames. Each TI group is also divided into more
than one TI block (N.sub.TI), where each TI block corresponds to
one usage of a time interleaver memory. The TI blocks within the TI
group may contain slightly different numbers of XFECBLOCKs. If the
TI group is divided into multiple TI blocks, the TI group is
directly mapped to only one frame. There are three options for time
interleaving (except an extra option of skipping time interleaving)
as shown in the following Table 26.
TABLE-US-00026 TABLE 26 Modes Descriptions Option 1 Each TI group
contains one TI block and is mapped directly to one frame as shown
in (a). This option is signaled in PLS2-STAT by DP_TI_TYPE = `0`
and DP_TI_LENGTH = `1` (N.sub.TI = 1). Option 2 Each TI group
contains one TI block and is mapped to more than one frame. (b)
shows an example, where one TI group is mapped to two frames, i.e.,
DP_TI_LENGTH = `2` (P.sub.I = 2) and DP_FRAME_INTERVAL (I.sub.JUMP
= 2). This provides greater time diversity for low data-rate
services. This option is signaled in PLS2-STAT by DP_TI_TYPE = `1`.
Option 3 Each TI group is divided into multiple TI blocks and is
mapped directly to one frame as shown in (c). Each TI block may use
a full TI memory so as to provide a maximum bit-rate for a DP. This
option is signaled in PLS2-STAT by DP_TI_TYPE = `0` and
DP_TI_LENGTH = N.sub.TI, while P.sub.I = 1.
[0806] Typically, the time interleaver may also function as a
buffer for DP data prior to a process of frame building. This is
achieved by means of two memory banks for each DP. A first TI block
is written to a first bank. A second TI block is written to a
second bank while the first bank is being read from and so on.
[0807] The TI is a twisted row-column block interleaver. For an
s.sup.th TI block of an n.sup.th TI group, the number of rows
N.sub.r of a TI memory is equal to the number of cells N.sub.cells,
i.e., N.sub.r=N.sub.cells while the number of columns N.sub.c is
equal to the number N.sub.xBLOCK_TI(n,s).
[0808] FIG. 30 illustrates a basic operation of a twisted
row-column block interleaver according to an embodiment of the
present invention.
[0809] FIG. 30(a) shows a write operation in the time interleaver
and FIG. 30(b) shows a read operation in the time interleaver. A
first XFECBLOCK is written column-wise into a first column of a TI
memory, and a second XFECBLOCK is written into a next column, and
so on as shown in (a). Then, in an interleaving array, cells are
read diagonal-wise. During diagonal-wise reading from a first row
(rightwards along a row beginning with a left-most column) to a
last row, N.sub.r cells are read out as shown in (b). In detail,
assuming z.sub.n,s,i (i=0, . . . , N.sub.rN.sub.c) as a TI memory
cell position to be read sequentially, a reading process in such an
interleaving array is performed by calculating a row index
R.sub.n,s,i, a column index C.sub.n,s,i, and an associated twisting
parameter T.sub.n,s,i as in the following Equation.
GENERATE ( R n , s , i , C n , s , i ) = { R n , s , i = mod ( i ,
N r ) , T n , s , i = mod ( S shift .times. R n , s , i , N c ) , C
n , s , i = mod ( T n , s . i + i N r , N c ) } [ Equation 8 ]
##EQU00001##
[0810] Here, S.sub.shift is a common shift value for a
diagonal-wise reading process regardless of N.sub.xBLOCK_TI (n, s),
and the shift value is determined by N.sub.xBLOCK_TI_MAX given in
PLS2-STAT as in the following Equation.
for { N xBLOCK_TI _MAX ' = N xBLOCK_TI _MAX + 1 , if N xBLOCK_TI
_MAX mod 2 = 0 N xBLOCK_TI _MAX ' = N xBLOCK_TI _MAX , if N
xBLOCK_TI _MAX mod 2 = 1 , S shift = N xBLOCK_TI _MAX ' - 1 2 [
Equation 9 ] ##EQU00002##
[0811] As a result, cell positions to be read are calculated by
coordinates z.sub.n,s,i=N.sub.rC.sub.n,s,i+R.sub.n,s,i.
[0812] FIG. 31 illustrates an operation of a twisted row-column
block interleaver according to another embodiment of the present
invention.
[0813] More specifically, FIG. 31 illustrates an interleaving array
in a TI memory for each TI group, including virtual XFECBLOCKs when
N.sub.xBLOCK_TI(0,0)=3, N.sub.xBLOCK_TI(1,0)=6, and
N.sub.xBLOCK_TI(2,0)=5.
[0814] A variable number N.sub.xBLOCK_TI(n,s)=N.sub.r may be less
than or equal to N'.sub.xBLOCK_TI_MAX. Thus, in order to achieve
single-memory deinterleaving at a receiver side regardless of
N.sub.xBLOCK_TI(n,s), the interleaving array for use in the twisted
row-column block interleaver is set to a size of
N.sub.r.times.N.sub.c=N.sub.cells.times.N'.sub.xBLOCK_TI_MAX by
inserting the virtual XFECBLOCKs into the TI memory and a reading
process is accomplished as in the following Equation.
TABLE-US-00027 [Equation 10] p = 0; for i = 0; i <
N.sub.cellsN.sub.xBLOCK_TI_ MAX.sup.'; i = i + 1 {GENERATE
(R.sub.n,s,i, C.sub.n,s,i); V.sub.i = N.sub.rC.sub.n,s,j +
R.sub.n,s,j if V.sub.i < N.sub.cellsN.sub.xBLOCK_TI(n,s) {
Z.sub.n,s,p = V.sub.i; p = p +1; } {
[0815] The number of TI groups is set to 3. An option of the time
interleaver is signaled in the PLS2-STAT data by DP_TI_TYPE=`0`,
DP_FRAME_INTERVAL=`1`, and DP_TI_LENGTH=`1`, i.e., NTI=1, IJUMP=1,
and PI=1. The number of XFECBLOCKs, each of which has
N.sub.cells=30 cells, per TI group is signaled in the PLS2-DYN data
by NxBLOCK_TI(0,0)=3, NxBLOCK_TI(1,0)=6, and NxBLOCK_TI(2,0)=5,
respectively. A maximum number of XFECBLOCKs is signaled in the
PLS2-STAT data by NxBLOCK_Group_MAX, which leads to .left
brkt-bot.N.sub.xBLOCK_Group_MAX/N.sub.TI.right
brkt-bot.=N.sub.xBLOCK_TI_MAX=6.
[0816] The purpose of the Frequency Interleaver, which operates on
data corresponding to a single OFDM symbol, is to provide frequency
diversity by randomly interleaving data cells received from the
frame builder. In order to get maximum interleaving gain in a
single frame, a different interleaving-sequence is used for every
OFDM symbol pair comprised of two sequential OFDM symbols.
[0817] Therefore, the frequency interleaver according to the
present embodiment may include an interleaving address generator
for generating an interleaving address for applying corresponding
data to a symbol pair.
[0818] FIG. 32 illustrates an interlaving address generator
including a main pseudo-random binary sequence (PRBS) generator and
a sub-PRBS generator according to each FFT mode according to an
embodiment of the present invention.
[0819] (a) shows the block diagrams of the interleaving-address
generator for 8K FFT mode, (b) shows the block diagrams of the
interleaving-address generator for 16K FFT mode and (c) shows the
block diagrams of the interleaving-address generator for 32K FFT
mode.
[0820] The interleaving process for the OFDM symbol pair is
described as follows, exploiting a single interleaving-sequence.
First, available data cells (the output cells from the Cell Mapper)
to be interleaved in one OFDM symbol O.sub.m,l is defined as
O.sub.m,l=[x.sub.m,l,0, . . . , x.sub.m,l,p, . . .
x.sub.m,l,N.sub.data.sub.-1] for l=0, . . . , N.sub.sym-1, where
x.sub.m,l,p is the p.sup.th cell of the l.sup.th OFDM symbol in the
m.sup.th frame and N.sub.data is the number of data cells:
N.sub.data=C.sub.FSS for the frame signaling symbol(s),
N.sub.data=C.sub.data for the normal data, and N.sub.data=C.sub.FES
for the frame edge symbol. In addition, the interleaved data cells
are defined as P.sub.m,l=[v.sub.m,l,0, . . . ,
v.sub.m,l,N.sub.data.sub.-1] for l=0, . . . , N.sub.sym-1.
[0821] For the OFDM symbol pair, the interleaved OFDM symbol pair
is given by
v.sub.m,l,H.sub.l.sub.(p)=x.sub.m,l,p,p=0, . . . ,N.sub.data-1, for
the first OFDM symbol of each pair
v.sub.m,l,p=x.sub.m,l,H.sub.l.sub.(p),p=0, . . . ,N.sub.data-1, for
the second OFDM symbol of each pair,
[0822] where H.sub.l(p) is the interleaving address generated by a
PRBS generator.
[0823] FIG. 33 illustrates a main PRBS used for all FFT modes
according to an embodiment of the present invention.
[0824] (a) illustrates the main PRBS, and (b) illustrates a
parameter Nmax for each FFT mode.
[0825] FIG. 34 illustrates a sub-PRBS used for FFT modes and an
interleaving address for frequency interleaving according to an
embodiment of the present invention.
[0826] (a) illustrates a sub-PRBS generator, and (b) illustrates an
interleaving address for frequency interleaving. A cyclic shift
value according to an embodiment of the present invention may be
referred to as a symbol offset.
[0827] FIG. 35 illustrates a write operation of a time interleaver
according to an embodiment of the present invention.
[0828] FIG. 35 illustrates a write operation for two TI groups.
[0829] A left block in the figure illustrates a TI memory address
array, and right blocks in the figure illustrate a write operation
when two virtual FEC blocks and one virtual FEC block are inserted
into heads of two contiguous TI groups, respectively.
[0830] Hereinafter, description will be given of a configuration of
a time interleaver and a time interleaving method using both a
convolutional interleaver (CI) and a block interleaver (BI) or
selectively using either the CI or the BI according to a physical
layer pipe (PLP) mode. A PLP according to an embodiment of the
present invention is a physical path corresponding to the same
concept as that of the above-described DP, and a name of the PLP
may be changed by a designer.
[0831] A PLP mode according to an embodiment of the present
invention may include a single PLP mode or a multi-PLP mode
according to the number of PLPs processed by a broadcast signal
transmitter or a broadcast signal transmission apparatus. The
single PLP mode corresponds to a case in which one PLP is processed
by the broadcast signal transmission apparatus. The single PLP mode
may be referred to as a single PLP.
[0832] The multi-PLP mode corresponds to a case in which one or
more PLPs are processed by the broadcast signal transmission
apparatus. The multi-PLP mode may be referred to as multiple
PLPs.
[0833] In the present invention, time interleaving in which
different time interleaving schemes are applied according to PLP
modes may be referred to as hybrid time interleaving. Hybrid time
interleaving according to an embodiment of the present invention is
applied for each PLP (or at each PLP level) in the multi-PLP
mode.
[0834] FIG. 36 illustrates an interleaving type applied according
to the number of PLPs in a table.
[0835] In a time interleaving according to an embodiment of the
present invention, an interleaving type may be determined based on
a value of PLP_NUM. PLP_NUM is a signaling field indicating a PLP
mode. When PLP_NUM has a value of 1, the PLP mode corresponds to a
single PLP. The single PLP according to the present embodiment may
be applied only to a CI.
[0836] When PLP_NUM has a value greater than 1, the PLP mode
corresponds to multiple PLPs. The multiple PLPs according to the
present embodiment may be applied to the CI and a BI. In this case,
the CI may perform inter-frame interleaving, and the BI may perform
intra-frame interleaving.
[0837] FIG. 37 is a block diagram including a first example of a
structure of a hybrid time interleaver described above.
[0838] The hybrid time interleaver according to the first example
may include a BI and a CI. The time interleaver of the present
invention may be positioned between a BICM chain block and a frame
builder.
[0839] The BICM chain block illustrated in FIGS. 37 and 38 may
include the blocks in the processing block 5000 of the BICM block
illustrated in FIG. 2 except for the time interleaver 5050. The
frame builder illustrated in FIGS. 37 and 38 may perform the same
function as that of the frame building block 1020 of FIG. 18.
[0840] As described in the foregoing, it is possible to determine
whether to apply the BI according to the first example of the
structure of the hybrid time interleaver depending on values of
PLP_NUM. That is, when PLP_NUM=1, the BI is not applied (BI is
turned OFF) and only the CI is applied. When PLP_NUM>1, both the
BI and the CI may be applied (BI is turned ON). A structure and an
operation of the CI applied when PLP_NUM>1 may be the same as or
similar to a structure and an operation of the CI applied when
PLP_NUM=1.
[0841] FIG. 38 is a block diagram including a second example of the
structure of the hybrid time interleaver described above.
[0842] An operation of each block included in the second example of
the structure of the hybrid time interleaver is the same as the
above description in FIG. 37. It is possible to determine whether
to apply a BI according to the second example of the structure of
the hybrid time interleaver depending on values of PLP_NUM. Each
block of the hybrid time interleaver according to the second
example may perform operations according to embodiments of the
present invention. In this instance, an applied structure and
operation of a CI may be different between a case of PLP_NUM=1 and
a case of PLP_NUM>1.
[0843] FIG. 39 is a block diagram including a first example of a
structure of a hybrid time deinterleaver.
[0844] The hybrid time deinterleaver according to the first example
may perform an operation corresponding to a reverse operation of
the hybrid time interleaver according to the first example
described above. Therefore, the hybrid time deinterleaver according
to the first example of FIG. 39 may include a convolutional
deinterleaver (CDI) and a block deinterleaver (BDI).
[0845] A structure and an operation of the CDI applied when
PLP_NUM>1 may be the same as or similar to a structure and an
operation of the CDI applied when PLP_NUM=1.
[0846] It is possible to determine whether to apply the BDI
according to the first example of the structure of the hybrid time
deinterleaver depending on values of PLP_NUM. That is, when
PLP_NUM=1, the BDI is not applied (BDI is turned OFF) and only the
CDI is applied.
[0847] The CDI of the hybrid time deinterleaver may perform
inter-frame deinterleaving, and the BDEI may perform intra-frame
deinterleaving. Details of inter-frame deinterleaving and
intra-frame deinterleaving are the same as the above
description.
[0848] A BICM decoding block illustrated in FIGS. 39 and 40 may
perform a reverse operation of the BICM chain block of FIGS. 37 and
38.
[0849] FIG. 40 is a block diagram including a second example of the
structure of the hybrid time deinterleaver.
[0850] The hybrid time deinterleaver according to the second
example may perform an operation corresponding to a reverse
operation of the hybrid time interleaver according to the second
example described above. An operation of each block included in the
second example of the structure of the hybrid time deinterleaver
may be the same as the above description in FIG. 39.
[0851] It is possible to determine whether to apply a BDI according
to the second example of the structure of the hybrid time
deinterleaver depending on values of PLP_NUM. Each block of the
hybrid time deinterleaver according to the second example may
perform operations according to embodiments of the present
invention. In this instance, an applied structure and operation of
a CDI may be different between a case of PLP_NUM=1 and a case of
PLP_NUM>1.
[0852] FIG. 41 is a block diagram illustrating a hybrid broadcast
reception apparatus according to an embodiment of the present
invention. A hybrid broadcast system can transmit broadcast signals
in connection with terrestrial broadcast networks and the Internet.
The hybrid broadcast reception apparatus can receive broadcast
signals through terrestrial broadcast networks (broadcast networks)
and the Internet (broadband). The hybrid broadcast reception
apparatus may include physical layer module(s), physical layer I/F
module(s), service/content acquisition controller, Internet access
control module(s), a signaling decoder, a service signaling
manager, a service guide manager, an application signaling manager,
an alert signal manager, an alert signaling parser, a targeting
signaling parser, a streaming media engine, a non-real time file
processor, a component synchronizer, a targeting processor, an
application processor, an A/V processor, a device manager, a data
sharing and communication unit, redistribution module(s), companion
device(s) and/or an external management module.
[0853] The physical layer module(s) may receive a broadcast related
signal through a terrestrial broadcast channel, process the
received signal, convert the processed signal into an appropriate
format and deliver the signal to the physical layer I/F
module(s).
[0854] The physical layer I/F module(s) may acquire an IP datagram
from information obtained from the physical layer module. In
addition, the physical layer I/F module may convert the acquired IP
datagram into a specific frame (e.g., RS frame, GSE, etc.).
[0855] The service/content acquisition controller may perform a
control operation for acquisition of services, content and
signaling data related thereto through broadcast channels and/or
broadband channels.
[0856] The Internet access control module(s) may control receiver
operations for acquiring service, content, etc. through broadband
channels.
[0857] The signaling decoder may decode signaling information
acquired through broadcast channels.
[0858] The service signaling manager may extract signaling
information related to service scan and/or content from the IP
datagram, parse the extracted signaling information and manage the
signaling information.
[0859] The service guide manager may extract announcement
information from the IP datagram, manage a service guide (SG)
database and provide a service guide.
[0860] The application signaling manager may extract signaling
information related to application acquisition from the IP
datagram, parse the signaling information and manage the signaling
information.
[0861] The alert signaling parser may extract signaling information
related to alerting from the IP datagram, parse the extracted
signaling information and manage the signaling information.
[0862] The targeting signaling parser may extract signaling
information related to service/content personalization or targeting
from the IP datagram, parse the extracted signaling information and
manage the signaling information. In addition, the targeting
signaling parser may deliver the parsed signaling information to
the targeting processor.
[0863] The streaming media engine may extract audio/video data for
A/V streaming from the IP datagram and decode the audio/video
data.
[0864] The non-real time file processor may extract NRT data and
file type data such as applications, decode and manage the
extracted data.
[0865] The component synchronizer may synchronize content and
services such as streaming audio/video data and NRT data.
[0866] The targeting processor may process operations related to
service/content personalization on the basis of the targeting
signaling data received from the targeting signaling parser.
[0867] The application processor may process application related
information and downloaded application state and display
parameters.
[0868] The A/V processor may perform audio/video rendering related
operations on the basis of decoded audio/video data and application
data.
[0869] The device manager may perform connection and data exchange
with external devices. In addition, the device manager may perform
operations of managing external devices connectable thereto, such
as addition/deletion/update of the external devices.
[0870] The data sharing and communication unit may process
information related to data transmission and exchange between a
hybrid broadcast receiver and external devices. Here, data that can
be transmitted and exchanged between the hybrid broadcast receiver
and external devices may be signaling data, A/V data and the
like.
[0871] The redistribution module(s) may acquire information related
to future broadcast services and content when the broadcast
receiver cannot directly receive terrestrial broadcast signals. In
addition, the redistribution module may support acquisition of
future broadcast services and content by future broadcast systems
when the broadcast receiver cannot directly receive terrestrial
broadcast signals.
[0872] The companion device(s) may share audio, video or signaling
data by being connected to the broadcast receiver according to the
present invention. The companion device may be an external device
connected to the broadcast receiver.
[0873] The external management module may refer to modules for
broadcast services/content provision. For example, the external
management module can be a future broadcast services/content
server. The external management module may be an external device
connected to the broadcast receiver.
[0874] FIG. 42 is a block diagram illustrating a hybrid broadcast
receiver according to an embodiment of the present invention.
[0875] The hybrid broadcast receiver may receive hybrid broadcast
services through interworking of terrestrial broadcasting and a
broadband network in DTV services of a future broadcast system. The
hybrid broadcast receiver may receive broadcast audio/video (A/V)
content transmitted through terrestrial broadcasting and receive
enhancement data related thereto or part of broadcast A/V content
through the broadband network in real time. In the specification,
the broadcast A/V content can be referred to as media content.
[0876] The hybrid broadcast receiver may include a physical layer
controller D55010, a tuner D55020, a physical frame parser D55030,
a link layer frame parser D55040, an IP/UDP datagram filter D55050,
an ATSC 3.0 digital TV (DTV) control engine D55060, an ALC/LCT+
client D55070, a timing controller D55080, a signaling parser
D55090, a dynamic adaptive streaming over HTTP (DASH) client
D55100, an HTTP access client D55110, an ISO base media file format
(BMFF) parser D55120 and/or a media decoder D55130.
[0877] The physical layer controller D55010 may control operations
of the tuner D55020 and the physical frame parser D55030 using
radio frequency (RF) information of a terrestrial broadcast channel
that the hybrid broadcast receiver intends to receive.
[0878] The tuner D55020 may receive a broadcast related signal
through a terrestrial broadcast channel, process the received
signal and convert the signal into an appropriate format. For
example, the tuner D55020 may convert a received terrestrial
broadcast signal into physical frames.
[0879] The physical frame parser D55030 may parse a received
physical frame and acquire a link layer frame through processing
related thereto.
[0880] The link layer parser D55040 may execute related operations
for acquisition of link layer signaling or an IP/UDP datagram from
the link layer frame. The link layer parser D55040 may output at
least one IP/UDP datagram.
[0881] The IP/UDP datagram filter D55050 may filter a specific
IP/UDP datagram from the received at least one IP/UDP datagram.
That is, the IP/UDP datagram filter D55050 may selectively filter
an IP/UDP datagram, which is selected by the ATSC 3.0 DTV control
engine, from the at least one IP/UDP datagram output from the link
layer parser D55040. The IP/UDP datagram filter D55050 may output
an application layer transport protocol packet such as
ALC/LCT+.
[0882] The ATSC 3.0 DTV control engine D55060 may serve as an
interface between modules included in the hybrid broadcast
receiver. In addition, the ATSC 3.0 DTV control engine D55060 may
deliver parameters necessary for each module to each module and
control operation of each module through the parameters. In the
present invention, the ATSC 3.0 DTV control engine D55060 may
deliver media presentation description (MPD) and/or an MPD URL to
the DASH client D55100. In addition, the ATSC 3.0 DTV control
engine D55060 may transfer a delivery mode and/or a transport
session identifier (TSI) to the ALC/LCT+ client D55070. Here, the
TSI may indicate an identifier of a session in which a transport
packet including a signaling message such as MPD or MPD URL related
signaling is transmitted, for example, ALC/LCT+ session
corresponding to an application layer transport protocol or FLUTE
session. In addition, the TSI may correspond to an asset ID of an
MMT.
[0883] The ALC/LCT+ client D55070 may generate one or more ISO base
media file format (ISO MMFF) objects by processing an application
layer transport protocol packet such as ALC/LCT+ and collecting and
processing a plurality of packets. The application layer transport
protocol packet may include an ALC/LCT packet, an ALC/LCT+ packet,
a ROUTE packet and/or an MMTP packet.
[0884] The timing controller D55080 may process a packet including
system time information and control a system clock according
thereto.
[0885] The signaling parser D55090 may acquire and parse DTV
broadcast service related signaling, and generate and manage a
channel map on the basis of the parsed signaling. In the present
invention, the signaling parser may parse MPD or MPD related
information extended from signaling information.
[0886] The DASH client D55100 may execute operations related to
real-time streaming or adaptive streaming. The DASH client D55100
may receive DASH content from an HTTP server through the HTTP
access client D55110. The DASH client D55100 may process a received
DASH segment and output an ISO BMFF object. In the present
invention, the DASH client D55100 may deliver a fully qualified
representation ID or a segment URL to the ATSC 3.0 DTV control
engine D55060. Here, the fully qualified representation ID may
refer to an ID corresponding to a combination of an MPD URL,
period@id and represenstation@id, for example. In addition, the
DASH client D55100 may receive the MPD or MPD URL from the ATSC 3.0
DTV control engine D55060. The DASH client D55100 may receive a
desired media stream or DASH segment from the HTTP server using the
received MPD or MPD URL. In the specification, the DASH client
D55100 may be referred to as a processor.
[0887] The HTTP access client D55110 may request that the HTTP
server provide specific information, receive a response to the
request from the HTTP server and process the response. Here, the
HTTP server may process the request received from the HTTP access
client and provide a response to the request.
[0888] The ISO BMFF parser D55120 may extract audio/video data from
the ISO BMFF object.
[0889] The media decoder D55130 may decode the received audio/video
data and perform processing for presentation of the decoded
audio/video data.
[0890] To provide hybrid broadcast services through interworking of
a terrestrial broadcast network and a broadband network according
to the hybrid broadcast receiver of the present invention, MPD
needs to be extended or modified. The aforementioned terrestrial
broadcast system may transmit extended or modified MPD and the
hybrid broadcast receiver may receive content through broadcasting
or a broadband network using the extended or modified MPD. That is,
the hybrid broadcast receiver may receive the extended or modified
MPD through terrestrial broadcasting and receive content through
terrestrial broadcasting or a broadband network on the basis of the
MPD. A description will be given of elements or attributes that
need to be additionally included in the extended or modified MPD,
compared to the conventional MPD. In the following, the extended or
modified MPD is referred to as MPD.
[0891] The MPD may be extended or modified to represent ATSC 3.0
service. The extended or modified MPD may additionally include
MPD@anchorPresentationTime, Common@presentable, Common.Targeting,
Common.TargetDevice and/or Common@associatedTo.
[0892] MPD@anchorPresentationTime may indicate a presentation time
anchor of segments included in the MPD, that is, base time. In the
following, MPD@anchorPresentationTime may be used as effective time
of the MPD. MPD@anchorPresentationTime may indicate the earliest
playback time from among segments included in the MPD.
[0893] The MPD may further include common attributes and elements.
The common attributes and elements may be applied to AdaptionSet
and Representation in the MPD.
[0894] Common@presentable may indicate that media described by the
MPD is a presentable component.
[0895] Common.Targeting may indicate targeting properties and/or
personalization properties of the media described by the MPD.
[0896] Common.TargetDevice may indicate a target device or target
devices of the media described by the MPD.
[0897] Common@associatedTo may indicate adaptationSet and/or
representation related to the media described by the MPD.
[0898] In addition, MPD@id, Period@id and AdaptationSet@id included
in the MPD may be necessary to specify media content described by
the MPD. That is, the DASH client may specify content to be
received on the basis of the MPD using MPD@id, Period@id and
AdaptationSet@id and signal the content to the ATSC 3.0 DTV control
engine. The ATSC 3.0 DTV control engine may receive the
corresponding content and deliver the content to the DASH
client.
[0899] FIG. 43 illustrates a protocol stack of a future hybrid
broadcast system according to an embodiment of the present
invention. As shown in the figure, a future broadcast transmission
system supporting IP based hybrid broadcasting may encapsulate
audio or video data of broadcast services in the ISO base media
file format (BMFF). Here, a DASH segment or a media processing unit
(MPU) of an MMT may be used for encapsulation. In addition, the
future broadcast system may equally transmit the encapsulated data
through a broadcast network and the Internet or differently
transmit the encapsulated data through the broadcast network and
the Internet according to attributes of the respective networks.
Furthermore, the future broadcast system may transmit the
encapsulated data using at least one of broadcast or broadband. In
the case of a broadcast network using broadcast, the broadcast
system may transmit data encapsulated in the ISO BMFF through an
application layer transport protocol packet which supports
real-time object delivery. For example, the broadcast system may
encapsulate data in a real-time object delivery over unidirectional
transport (ROUTE) or MMTP transport packet. The broadcast system
may process the encapsulated data into an IP/UDP datagram, load the
IP/UDP datagram in a broadcast signal and transmit the broadcast
signal. When broadband is used, the broadcast system may deliver
the encapsulated data to a receiving side through streaming such as
DASH.
[0900] In addition, the broadcast system may transmit broadcast
service signaling information as follows. In the case of a
broadcast network using broadcast, the broadcast system may
transmit signaling information through physical layers of the
future broadcast transmission system and the broadcast network
according to signaling attributes. Here, the broadcast system may
transmit the signaling information through a specific data pipe
(DP) of a transport frame included in a broadcast signal. Signaling
information transmitted through broadcast may have a form of being
encapsulated in a bitstream or IP/UDP datagram. When broadband is
used, the broadcast system may return and deliver signaling data to
a receiver in response to a request of the receiver.
[0901] In addition, the broadcast system may deliver broadcast
service ESG or NRT content through the following method. In the
case of a broadcast network using broadcast, the broadcast system
may encapsulate the ESG or NRT content in an application layer
transport protocol packet, for example, real-time object delivery
over unidirectional transport (ROUTE) or MMTP transport packet. The
broadcast system may generate an IP/UDP datagram with the
encapsulated ESG or NRT content, load the IP/UDP datagram in a
broadcast signal and transmit the broadcast signal. When broadband
is used, the broadcast system may return and deliver the ESG or NRT
content to a receiver in response to a request of the receiver.
[0902] FIG. 44 illustrates a structure of a transport frame
delivered to a physical layer of the future broadcast transmission
system according to an embodiment of the present invention. The
future broadcast system may transmit a transport frame using
broadcast. In the figure, P1 located at the front of the transport
frame may refer to a symbol including information for transport
signal detection. P1 may include tuning information and a receiver
may decode a part L1 following P1 on the basis of a parameter
included in the symbol P1. The broadcast system may include, in the
part L1, information about transport frame configuration and
characteristics of data pipes. That is, the receiver may obtain the
information about the transport frame configuration and
characteristics of data pipes by decoding the part L1. In addition,
the receiver may acquire information that needs to be shared
between DPs through a common DP. According to an embodiment, the
transport frame may not include the common DP.
[0903] Components such as audio, video and data in the transport
frame are included in an interleaved DP region composed of DP1 to
DPn and transmitted. Here, DPs through which components
constituting each service (channel) are transmitted may be signaled
through L1 or a common PLP.
[0904] In addition, the future broadcast system may transmit
information for rapidly acquiring information about services
included in a transport frame. That is, the future broadcast system
may enable a future broadcast receiver to rapidly acquire broadcast
service and content related information included in a transport
frame. When services/content generated by one or more broadcasting
stations are present in the corresponding frame, the future
broadcast system may enable the receiver to efficiently recognize
the services/content according to the broadcasting stations. That
is, the future broadcast system may include, in a transport stream,
service list information about services included in the transport
stream, and transmit the transport stream including the service
list information.
[0905] When an additional channel, for example, a fast information
channel (FIC) is present, the broadcast system may transmit
broadcast service related information through the additional
channel such that the receiver can rapidly scan broadcast services
and content in a corresponding frequency. As shown in the middle of
FIG. 44, the broadcast system may include, in the transport stream,
information for broadcast service scan and acquisition and transmit
the same. Here, the region including the information for broadcast
service scan and acquisition may be referred to as an FIC. The
receiver may acquire information about broadcast services generated
and transmitted by one or more broadcasting stations and easily and
rapidly scan broadcast services available therein using the
information.
[0906] In addition, a specific DP included in the transport stream
may serve as a base DP capable of rapidly and robustly delivering
signaling about broadcast services and content transmitted in the
corresponding transport frame. Data transmitted through each DP of
the transport frame of the physical layer is as shown in the lower
part of FIG. 44. That is, link layer signaling or an IP datagram
may be encapsulated in a generic packet in a specific format and
then transmitted through a DP. Here, the IP datagram may include
signaling data. Link (low) layer signaling can include signaling
related to fast service scan/acquisition, context information of IP
header compression and emergency alert
[0907] FIG. 45 illustrates a transport packet of an application
layer transport protocol according to an embodiment of the present
invention. An application layer transport session may be composed
of a combination of an IP address and a port number. When the
application layer transport protocol corresponds to ROUTE, a ROUTE
session may be composed of one or more layered coding transport
(LCT) sessions. For example, when a single media component (e.g.,
DASH representation) is delivered through a single LCT transport
session, one or more media components may be multiplexed and
delivered through a single application transport session.
Furthermore, one or more transport objects may be delivered through
a single LCT transport session, and each transport object may be a
DASH segment associated with DASH representation delivered through
the transport session.
[0908] For example, when the application layer transport protocol
is an LCT based protocol, a transport packet may be configured as
follows. The transport packet may include an LCT header, a ROUTE
header and payload data. A plurality of fields included in the
transport packet is as follows.
[0909] The LCT header may include the following fields. A version
field V may indicate version information of the corresponding
transport protocol packet. A field C may indicate a flag related to
the length of a congestion control information field which will be
described below. A field PSI may indicate protocol-specific
information, that is, information specific to the corresponding
protocol. A field S may indicate a flag associated with the length
of a transport session identifier (TSI) field. A field O may
indicate a flag associated with the length of a transport object
identifier (TOI) field. A field H may indicate whether a half-word
(16 bits) is added to the lengths of the TSI field and the TOI
field. A field A (close session flag) may indicate that a session
is closed or closure of the session is imminent. A field B (close
object flag) may indicate that an object being transmitted is
closed or closure of the object is imminent. A code point field may
indicate information related to encoding or decoding of a payload
of the relevant packet. For example, payload type may correspond to
the information. A congestion control information field may include
information related to congestion control. For example, the
information related to congestion control may be a current time
slot index (CTSI), a channel number or a packet sequence number in
the relevant channel. A transport session identifier field may
indicate a transport field identifier. A transport object
identifier field may indicate an identifier of an object
transmitted through the transport session.
[0910] A ROUTE (ALC) header may include additional information of
the preceding LCT header, such as a payload identifier related to a
forward error correction scheme.
[0911] Payload data may indicate a data part of the payload of the
packet.
[0912] FIG. 46 illustrates a method for transmitting signaling data
by the future broadcast system according to an embodiment of the
present invention. Signaling data of the future broadcast system
may be transmitted as shown in the figure. To enable the receiver
to support fast service/content scan and acquisition, the future
broadcast transmission system may transmit signaling data with
respect to a broadcast service delivered through a physical layer
frame, via a fast information channel (FIC). In the specification,
the FIC may refer to information about a service list. Unless an
additional FIC is present, the signaling data may be delivered
through a path through which link layer signaling is delivered.
That is, signaling information including information about services
and components (audio and video) thereof may be encapsulated in an
IP/UDP datagram and transmitted through one or more DPs in the
physical layer frame. According to an embodiment, signaling
information about services and service components may be
encapsulated in an application layer transport packet (e.g. a ROUTE
packet or an MMTP packet) and transmitted.
[0913] The upper part of FIG. 46 illustrates an example of
delivering the aforementioned signaling data through an FIC or one
or more DPs. That is, signaling data for supporting fast service
scan/acquisition may be delivered through the FIC and signaling
data including detailed information about services may be
encapsulated in an IP datagram and transmitted through a specific
DP. In the specification, the signaling data including detailed
information about services may be referred to as service layer
signaling.
[0914] The middle part of FIG. 46 illustrates an example of
delivering the aforementioned signaling data through an FIC and one
or more DPs. That is, signaling data for supporting fast service
scan/acquisition may be delivered through the FIC and signaling
data including detailed information about services may be
encapsulated in an IP datagram and transmitted through a specific
DP. In addition, part of signaling data including information about
a specific component included in a service may be delivered through
one or more transport sessions in the application layer transport
protocol. For example, part of the signaling data may be delivered
through one or more transport sessions in a ROUTE session.
[0915] The lower part of FIG. 46 illustrates an example of
delivering the aforementioned signaling data through an FIC and one
or more DPs. That is, signaling data for supporting fast service
scan/acquisition may be delivered through the FIC and signaling
data including detailed information about services may be delivered
through one or more sessions in a ROUTE session.
[0916] FIG. 47 illustrates signaling data transmitted, by the
future broadcast system according to an embodiment of the present
invention, for fast broadcast service scan of a receiver. The
specification proposes signaling information for allowing a future
broadcast reception apparatus to scan and acquire broadcast
services. In the future broadcast system, broadcast services and
content generated by one or more broadcasting stations may be
transmitted within a specific frequency. A receiver may use the
aforementioned signaling information to rapidly and easily scan
broadcasting stations and services/contents thereof, included in
the corresponding frequency. The signaling information may be
represented by the illustrated syntax and expressed in other
formats such as XML.
[0917] The signaling information for fast service scan and
acquisition may be delivered to a fast information channel (FIC)
corresponding to an additional channel in a physical layer
transport frame. Furthermore, the aforementioned signaling
information may be delivered through a common DP capable of
carrying information that can be shared between data pipes of the
physical layer. The signaling information may be delivered through
a path through which link layer signaling is transmitted. The
signaling information may be encapsulated in an IP datagram and
delivered through a specific DP. Furthermore, the signaling
information may be delivered via a service signaling channel
through which service signaling is transmitted or a transport
session of an application layer.
[0918] The signaling information (FIC information) for fast service
scan and acquisition may include at least one of the following
fields. In the specification, the FIC information may be referred
to as service acquisition information. An FIC_portocol version
field may indicate the version of the structure of the signaling
information. A TSID field may indicate an identifier of the overall
broadcast stream. An FIC_data version field may indicate the data
version of the FIC information. The value of the FIC_data version
field may increase when the contents of FIC are changed. A
num_partitions field may indicate the number of partitions of a
broadcast stream. To use the num_partitions field, it is assumed
that each broadcast stream can be segmented into one or more
partitions and transmitted. Each partition may include a plurality
of DPs of a single broadcaster. Each partition may indicate a part
of a broadcast stream used by a single broadcaster. A
partition_protocol_version field may indicate the version of the
aforementioned partition structure. A base_DP_ID field may indicate
the identifier of a base DP of a relevant partition. The base DP
may include a service signaling table. The service signaling table
may include a list of all services in the partition. That is, the
service signaling table may list transmitted services. In addition,
the service signaling table may define basic attributes of each
service. The base DP may be a robust DP in the partition and may
include another signaling table with respect to the partition. A
base_DP_version field may indicate version information representing
change of data transmitted through the base DP. For example, when
service signaling is delivered through the base DP, the
base_DP_version field may increase by 1 if the serving signaling is
changed. A num_services field may indicate the number of one or
more components belonging to the partition. A service_id field may
indicate a service identifier. A channel_number field may indicate
a channel number associated with the relevant service. A
service_category field may indicate the category of the service.
For example, the service_category field may indicate A/V, audio,
ESG, CoD, etc. A short_service_name_length field may indicate the
length of the name of the service. A short Service name field may
indicate the name of the service. A service_status field may
indicate the status of the service. The service_status field may
indicate an "active", "suspended", "hidden" or "shown" attribute. A
service distribution field may have an attribute similar to
"multi-ensemble" flag of the ATSC M/H document. For example, the
service_distribution field may indicate information about whether
the service is included in the partition, the service is
presentable only with the partition although the service is
partially included in the partition, another partition is necessary
for presentation, or other broadcast streams are necessary for
presentation. An sp_indicator field is a service protection flag
and may indicate whether one or more components necessary for
presentation are protected.
[0919] FIG. 48 illustrates signaling data transmitted, by the
future broadcast system according to an embodiment of the present
invention, for fast broadcast service scan of a receiver. The FIC
information (service acquisition information) for supporting fast
broadcast service scan and service/component acquisition may
include information about an application layer transport session
for delivering service and component data. As illustrated, the FIC
information may be represented in a binary format. However, the FIC
information may be represented in other formats such as XML
according to embodiment. The FIC information may include the
following fields. An FIC_portocol_version field may indicate the
version of the structure of the signaling information. A TSID field
may indicate an identifier of the overall broadcast stream. An
FIC_data_version field may indicate the data version of the FIC
information. The value of the FIC_data_version field may increase
when the contents of the FIC are changed. A num_partitions field
may indicate the number of partitions of a broadcast stream. To use
the num_partitions field, it is assumed that each broadcast stream
can be segmented into one or more partitions and transmitted. Each
partition may include a plurality of DPs of a single broadcaster.
Each partition may indicate a part of a broadcast stream used by a
single broadcaster. A partition_id field may indicate the
identifier of the relevant partition. A partition_protocol_version
field may indicate the version of the aforementioned partition
structure. A num_services field may indicate the number of one or
more components belonging to the partition. A service_id field may
indicate a service identifier. A service_data_version field may
indicate a change of service loop data in the FIC or a change of
serving signaling data related to the service. The value of the
service_data_version field may increase by 1 whenever included
service data is changed. The receiver may detect data change in a
service loop of the FIC or change of signaling related to the
service using the service_data_version field. A channel_number
field may indicate a channel number associated with the service. A
service_category field may indicate the category of the service.
For example, the service_category field may indicate A/V, audio,
ESG, CoD, etc. A short_service_name_length field may indicate the
length of the name of the service. A short_service name field may
indicate the name of the corresponding service. A service_status
field may indicate the status of the service. The service_status
field may indicate an attribute "active", "suspended", "hidden" or
"shown" according to the value thereof. A service_distribution
field may have an attribute similar to the "multi-ensemble" flag of
the ATSC M/H document. For example, the service_distribution field
may indicate information about whether the service is included in
the partition, the service is presentable only with the partition
although the service is partially included in the partition,
another partition is necessary for presentation, or other broadcast
streams are necessary for presentation. An sp_indicator field is a
service protection flag and may indicate whether one or more
components necessary for presentation are protected. An
IP_version_flag field may indicate the following IP address format.
The IP_version_flag field may indicate that IPv4 is used when the
value thereof is 0 and indicate that IPv6 is used when the value
thereof is 1. A source_IP_address_flag field may indicate whether
the FIC information includes source_IP_addr. The
source_IP_address_flag field may indicate presence of
source_IP_addr when the value thereof is 1. A num_transport_session
field may indicate the number of transport sessions (e.g. ROUTE or
MMTP sessions) in which component data of the service is
transmitted in a broadcast stream. A source_IP_addr field may
indicate the source IP address of an IP datagram including the
component data of the service when the source_IP_address_flag is 1.
A dest_IP_addr field may indicate the destination IP address of the
IP datagram including the component data of the service. A
dest_UDP_port field may indicate the UDP port number of the IP
datagram including the component data of the service. An LSID_DP
field may indicate the identifier of a data pipe of a physical
layer, which delivers signaling including detailed information
about a transport session. In the case of ROUTE, for example, the
signaling including the detailed information about the transport
session may be an LCT session instance description including
information about an LCT transport session of a ROUTE session. A
service_signaling_flag field may indicate whether service signaling
is transmitted through a transport session. The
service_signaling_flag field may indicate that data transmitted
through the transport session (e.g. ROUTE or MMTP session) includes
the service signaling when the value thereof is 1. A transport
session descriptors field may include transport session level
descriptors. Each descriptor can be extended and include a
num_descriptors field. Each descriptor may include as many
descriptor loops as a number corresponding to a value indicated by
the num_descriptors field. The transport session descriptors field
may include transport session level descriptors. A service
descriptors field may include service level descriptors. A
partition descriptors field may include a partition level
descriptor, and one partition may indicate part of broadcast
streams used by a single broadcaster. An FIC session descriptors
field may include FIC level descriptors. According to an
embodiment, the fields included in the FIC may be included in a
table other than the FIC and transmitted along with a broadcast
signal.
[0920] FIG. 49 illustrates a method of transmitting FIC based
signaling according to an embodiment of the present invention. The
aforementioned example of delivering FIC based signaling is shown
in the figure. In the specification, FIC based signaling may be
referred to as service acquisition information or service
acquisition signaling. As shown in the figure, physical layer
signaling may include a field with respect to the service
acquisition information. The field with respect to the service
acquisition information may indicate whether the service
acquisition information FIC is parsed to the receiver. The receiver
may check whether service signaling data has been changed through
service_data_version information by parsing the service acquisition
information. When the service signaling data has been changed, the
broadcast signal receiver may confirm a data pipe identifier of the
physical layer which delivers signaling including detailed
information about the transport session, using an LSID_DP field.
The broadcast receiver may confirm detailed information about the
transport session by parsing a DP indicated by the DP identifier.
That is, the signaling method of the future broadcast system may
include a sequence of confirming detailed information about the
transport session by signaling whether the service acquisition
information is parsed through the physical layer signaling and
signaling the position of the detailed information about the
transmission session through the service acquisition information.
Here, the detailed information about the transport session may
include an MPD transport table, an application signaling table, a
transport session descriptor (LSID) and/or a component mapping
table (CMT).
[0921] FIG. 50 illustrates signaling data transmitted, by the
future broadcast system according to an embodiment, for fast
broadcast service scan of a receiver. The FIC information (service
acquisition information) for supporting fast broadcast service scan
and service/component acquisition may include information about an
application layer transport session for delivering service and
component data. As illustrated, the FIC information can be
represented in a binary format. However, the FIC information may be
represented in other formats such as XML according to embodiment.
The FIC information may include the following fields. An
FIC_portocol_version field may indicate the version of the
structure of the signaling information. A TSID field may indicate
an identifier of the overall broadcast stream. An FIC_data_version
field may indicate the data version of the FIC information. The
value of the FIC_data_version field may increase when the contents
of the FIC are changed. A num_partitions field may indicate the
number of partitions of a broadcast stream. To use the
num_partitions field, it is assumed that each broadcast stream can
be segmented into one or more partitions and transmitted. Each
partition may include a plurality of DPs of a single broadcaster.
Each partition may indicate a part of a broadcast stream used by a
single broadcaster. A partition_id field may indicate the
identifier of the relevant partition. A partition_protocol_version
field may indicate the version of the aforementioned partition
structure. A num_services field may indicate the number of one or
more components belonging to the partition. A service_id field may
indicate a service identifier. A service_data_version field may
indicate a change of service loop data in the FIC or a change of
serving signaling data related to the service. The value of the
service_data_version field may increase by 1 whenever included
service data is changed. The receiver may detect data change in a
service loop of the FIC or change of signaling related to the
corresponding service using the service_data_version field. A
channel_number field may indicate a channel number associated with
the service. A service_category field may indicate the category of
the service. For example, the service_category field may indicate
A/V, audio, ESG, CoD, etc. A short_service_name_length field may
indicate the length of the name of the service. A
short_Service_name field can indicate the name of the service. A
service_status field may indicate the status of the service. The
service_status field may indicate an "active", "suspended",
"hidden" or "shown" attribute according to the value thereof. A
service_distribution field may have an attribute similar to
"multi-ensemble" flag of the ATSC M/H document. For example, the
service_distribution field may indicate information about whether
the service is included in the partition, whether the service is
presentable only with the partition although the service is
partially included in the partition, whether another partition is
necessary for presentation, or whether other broadcast streams are
necessary for presentation. An sp_indicator field is a service
protection flag and may indicate whether one or more components
necessary for presentation are protected. An IP_version_flag field
may indicate the following IP address format. The IP_version_flag
field may indicate that IPv4 is used when the value thereof is 0
and indicate that IPv6 is used when the value thereof is 1. A
source_IP_address_flag field may indicate whether the FIC
information includes source_IP_addr. The source_IP_address_flag
field may indicate presence of source_IP_addr when the value
thereof is 1. A num_transport_session field may indicate the number
of transport sessions (e.g. ROUTE or MMTP sessions) in which
component data of the service is transmitted in a broadcast stream.
A source_IP_addr field may indicate the source IP address of an IP
datagram including the component data of the service when the
source_IP_address_flag is 1. A dest_IP_addr field may indicate the
destination IP address of the IP datagram including the component
data of the service. A dest_UDP_port field may indicate the UDP
port number of the IP datagram including the component data of the
service. An LSID_DP field may indicate the identifier of a data
pipe of a physical layer, which delivers signaling including
detailed information about a transport session. In the case of
ROUTE, for example, the signaling including the detailed
information about the transport session may be LCT session instance
description including information about an LCT transport session of
a ROUTE session. A service_signaling_flag field may indicate
whether service signaling is transmitted through the transport
session. The service_signaling_flag field may indicate presence of
a DP including service signaling when the value thereof is 1. A
signaling_data_version field may indicate a change of related
service signaling data. The value of the signaling_data_version
field may increase by 1 whenever the service signaling data is
changed. The receiver may detect a change of signaling related to
the service using the signaling_data_version field. A signaling_DP
field may indicate the identifier of a data pipe of the physical
layer, which delivers service signaling. A transport session
descriptors field may include transport session level descriptors.
Each descriptor may be extended and include a num_descriptors
field. Each descriptor may include as many descriptor loops as a
number corresponding to a value indicated by the num_descriptors
field. The transport session descriptors field may include
transport session level descriptors. A service descriptors field
may include service level descriptors. A partition descriptors
field may include a partition level descriptor, and one partition
may indicate part of broadcast streams used by a single
broadcaster. An FIC session descriptors field may include FIC level
descriptors. According to an embodiment, the fields included in the
FIC may be included in a table other than the FIC and transmitted
along with a broadcast signal.
[0922] FIG. 51 illustrates a method for transmitting FIC based
signaling according to another embodiment of the present invention.
The aforementioned example of delivering FIC based signaling is as
shown in the figure. In the specification, FIC based signaling may
be referred to as service acquisition information or service
acquisition signaling. As shown in the figure, physical layer
signaling may include a field with respect to the service
acquisition information. The field with respect to the service
acquisition information may indicate whether the service
acquisition information FIC is parsed to the receiver. The receiver
may check whether service signaling data has been changed through
service_data_version information by parsing the service acquisition
information. When the service signaling data has been changed, the
broadcast signal receiver may acquire LSID or an LSID table, which
includes detailed information about the transport session, using an
LSID_DP field through a DP identified from the LSID_DP field. In
addition, the receiver may recognize a change of signaling data
using information such as the service_signaling_flag,
signaling_data_version and signaling_DP and acquire the signaling
data through an identified DP.
[0923] That is, the signaling method of the future broadcast system
may include a sequence of confirming detailed information about the
transport session by signaling whether the service acquisition
information is parsed through the physical layer signaling and
signaling the position of the detailed information about the
transmission session through the service acquisition information.
Here, the detailed information about the transport session may
include an MPD transport table, an application signaling table, a
transport session descriptor (LSID) and/or a component mapping
table (CMT), and detailed information of transmission sessions can
be delivered according to different examples.
[0924] FIG. 52 illustrates a service signaling message format of
the future broadcast system according to an embodiment of the
present invention. In the specification, a service signaling
message may be referred to as signaling data or service layer
signaling including detailed information about services. The
service signaling message may include a signaling message header
and a signaling message. The signaling message may be represented
in a binary or XML format. The signaling message may be transmitted
in an IP datagram or a payload of an application layer transport
packet (e.g. ROUTE or MMTP packet). The signaling message header
may have the following syntax and can be represented in a format
such as XML. The signaling message header may include the following
fields. A signaling_id field may indicate a signaling message
identifier. For example, when the signaling message is represented
in the form of a section, the signaling_id field may indicate the
ID of a signaling table section. A signaling_length field may
indicate the length of the signaling message. A
signaling_id_extension field may indicate extension information
about the identifier of the signaling message. The
signaling_id_extension field may be used as signaling
identification information along with the signaling_id field. For
example, the signaling_id_extension field may include the protocol
version of the signaling message. A version_number field may
indicate version information of the signaling message. The
version_number field may be modified when the contents of the
signaling message are changed. A current_next_indicator field may
indicate whether the signaling message is currently available. The
current_next_indicator field may indicate that the signaling
message is currently available when the value thereof is 1. The
current_next_indicator field may indicate that the signaling
message is not currently available and a signaling message
including the same signaling_id, signaling_id extension or
fragment_number may be available in the future when the value
thereof is 0. A fragmentation_indicator field may indicate whether
the signaling message has been fragmented. The
fragmentation_indicator field indicates that the signaling message
has been fragmented when the value thereof is 1. In this case,
inclusion of part of signaling data may be indicated through
signaling_message_data( ). When the value of the
fragmentation_indicator field is 0, inclusion of the entire
signaling data may be indicated through signaling_message_data( ).
A payload_format indicator field may indicate whether the current
signaling message header includes a payload_format value. A
payload_format_indicator field value of 1 may indicate that the
signaling message header includes a payload_format value. An
expiration_indicator field may indicate whether the current
signaling message header includes an expiration value. An
expiration_indicator field value of 1 may indicate that the
signaling message header includes an expiration value. A
fragment_number field may indicate a fragment number of the current
signaling message when a single signaling message is divided into
multiple fragments and transmitted. A last_fragment_number field
may indicate the number of a fragment including the last data of a
single signaling message when the single signaling message is
divided into multiple fragments and transmitted. A payload_format
field may indicate the format of signaling message data included in
a payload. In an embodiment, the payload_format field may be
represented in a binary or XML format. An expiration field may
indicate effective time of the signaling message included in the
payload.
[0925] FIG. 53 shows service signaling tables used in the future
broadcast system according to an embodiment of the present
invention. Service signaling tables/messages according to the
present invention are as described below and may include the
following information and be signaled. Information included in
tables/messages may be individually transmitted through the
respective tables and is not limited to the illustrated embodiment.
According to an embodiment, signaling information belonging to
different tables may be merged into one table and transmitted. A
service mapping table may include service attributes and service
related information. For example, attribute information of services
may include information such as IDs, names and categories of the
services, and information related to services may include
information about paths through which the services can be acquired.
An MPD delivery table may include DASH MPD related to
services/content or information on paths through which DASH MPD can
be acquired. A component mapping table may include component
information in services and component related information. The
component information may include related DASH representation
information, and the component related information may include
information on paths through which components can be acquired. An
LSID table may include information about transport sessions for
delivering services/components and transport packet configurations.
An initialization segment delivery table may include initialization
segment information about DASH representation related to components
in services or information about paths through which the
initialization segment information can be acquired. An application
parameter table may include detailed information about applications
relate to broadcast services and information about paths through
which the detailed information can be obtained. When such signaling
messages/tables are transmitted through a broadcast network, the
signaling messages/tables may be transmitted through a fast
information channel (FIC), a service signaling channel (SSC), an
application layer transport session (e.g., ROUTE or MMTP session)
or the like. Furthermore, the signaling messages/tables may be
transmitted over the Internet (broadband).
[0926] FIG. 54 shows a service mapping table used in the future
broadcast system according to an embodiment of the present
invention. The following description may be transmitted by being
included in a service signaling message part following a signaling
message header.
[0927] The service mapping table may include information about
service mapping signaling and may be represented in XML or binary
format. The service mapping table corresponding to service
signaling information may include a service identifier, a service
type, a service name, a channel number, ROUTE session related
information, MPD related information and component signaling
position information. The service identifier may indicate
information identifying a service and may be represented as an id
attribute. The service type information may indicate the type of
the service and may be represented as a serviceType attribute. The
service name information may indicate the name of the service and
may be represented as a serviceName attribute. The channel number
information may indicate a channel number related to the service
and may be represented as a channelNumber attribute.
[0928] The ROUTE session related information may include sourceIP,
destinationIP and destinationPort attributes. The sourceIP
attribute may indicate a source address of IP datagrams carrying
associated data. The destinationIP attribute may indicate a
destination address of the IP datagrams carrying associated data.
The destinationPort attribute may indicate a destination port
number of the IP datagrams carrying associated data.
[0929] In addition, the ROUTE session related information may
include detailed information (LSID) about transport sessions. For
example, the ROUTE session related information may include LSID
location information and delivery mode information of LSID location
information. Furthermore, the detailed information LSID about
transport sessions may include bootstrap information. The bootstrap
information included in LSID may include LSID bootstrap information
according to delivery mode. Attributes included in the bootstrap
information will be described in detail below.
[0930] The MPD related information may include information about
MPD or MPD signaling location. The information about MPD may
include a version attribute and indicate the version of MPD. The
MPD signaling location information may indicate a location where
signaling related to MPD or MPD URL can be acquired. Delivery mode
information included in MPD signaling location may indicate a
delivery mode of the MPD location signaling. Bootstrap information
included in the MPD signaling location may include bootstrap
information of MPD or MPD URL according to the delivery mode.
[0931] The component signaling location related information may
include a delivery mode attribute. The delivery mode attribute may
indicate a delivery mode of the component signaling location
information. The bootstrap information included in the MPD
signaling location may include bootstrap information of component
location signaling according to the delivery mode.
[0932] The bootstrap information may include at least one of the
following attributes according to delivery mode.
[0933] A sourceIP attribute may indicate a source address of IP
datagrams carrying associated data. A destinationIP attribute may
indicate a destination address of the IP datagrams carrying
associated data. A destinationPort attribute may indicate a
destination port number of the IP datagrams carrying associated
data. A tsi attribute may include the identifier of a transport
session delivering transport packets carrying associated data. A
URL attribute may indicate a URL through which associated data can
be acquired. A packetid attribute may indicate the identifier of
transport packets carrying associated data.
[0934] FIG. 55 shows a service signaling table of the future
broadcast system according to an embodiment of the present
invention. The future broadcast system may provide broadcast
service signaling such that the receiver can receive broadcast
services and content. This allows the receiver to acquire related
signaling when signaling data is transmitted through the same
transport session identifier TSI. The service signaling table may
be represented in a binary format as illustrated and may be
represented in other formats such as XML according to embodiment.
In addition, the service signaling table may encapsulated in the
aforementioned signaling message format. The service signaling
table may include the following fields. An SST_portocol_version
field may indicate the version of the service signaling table. A
partition_id field may indicate the identifier of a relevant
partition. An SST_data_version field may indicate the data version
of the service signaling table. A num_services field may indicate
the number of one or more services included in the partition. A
service_id field may indicate the identifier of the relevant
service. A service_name field may indicate the name of the service.
An MPD_availability field may indicate whether MPD can be acquired
through broadcast, a cellular network and/or Wi-Fi/Ethernet. A
CMT_availability field may indicate whether a component mapping
table (CMT) can be used through broadcast, a cellular network
and/or Wi-Fi/Ethernet. An ASL_availability field may indicate
whether an application signaling table (AST) can be used through
broadcast, a cellular network and/or Wi-Fi/Ethernet. A DP_ID field
may indicate the identifier of a DP carrying the MPD, CMT and/or
ASL through broadcast. An LCT_IP_address field may indicate the IP
address of an LCT channel delivering the MPD, CMT and/or ASL. An
LCT_UDP_port field may indicate a UDP port of the LCT channel
delivering the MPD, CMT and/or ASL. An LCT_TSI field may indicate a
transport session identifier (TSI) of the LCT channel delivering
the MPD, CMT and/or ASL. An MPD_TOI field may indicate the
transport object identifier of the MPD when the MPD is delivered
through broadcast. A CMT TOI field may indicate the transport
object identifier of the CMT when the CMT is delivered through
broadcast. An AST_TOI field may indicate the transport object
identifier of the AST when the AST is delivered through broadcast.
An MPD_URL field may indicate a URL through which the MPD can be
acquired through broadband. A CMT_URL field may indicate a URL
through which the CMT can be acquired through broadband. An AST_URL
field may indicate a URL through which the AST can be acquired
through broadband.
[0935] FIG. 56 shows a component mapping table used in the future
broadcast system according to an embodiment of the present
invention. The following description may be transmitted by being
included in a service signaling message part following a signaling
message header. The component mapping table may include information
about component mapping signaling and may be represented in XML or
binary format. The component mapping table corresponding to service
signaling information may include the following fields. A
signaling_id field may include an identifier indicating that the
relevant table is the component mapping table. A protocol_version
field may indicate a protocol version of the component mapping
table, such as a component mapping table syntax. A
signaling_version field may indicate a change of signaling data of
the component mapping table. A service_id field may indicate the
identifier of a service associated with relevant components. A
Num_component field may indicate the number of components included
in the service. An Mpd_id field may indicate a DASH MPD identifier
associated a component. A period_id field may indicate a DASH
period identifier associated with the component. A
representation_id field may indicate a DASH representation
identifier associated with the component. A source_IP field may
indicate a source IP address of IP/UDP datagrams carrying relevant
component data. A Dest_IP field may indicate a destination IP
address of the IP/UDP datagrams carrying the component data. A port
field may indicate a port number of the IP/UDP datagrams carrying
the component data. A tsi field may indicate the identifier of an
application layer transport session carrying the component data. A
DP_id field may indicate the identifier of a physical layer data
pipe carrying the component data. The CMT may define components
associated with each service and signal, to the receiver, locations
or paths where the components can be received through the
aforementioned information.
[0936] FIG. 57 illustrates a component mapping table description
according to an embodiment of the present invention. The component
mapping description may signal information about transport paths of
components included in broadcast services in the future broadcast
system. The component mapping table description may be represented
in XML format or as a binary bitstream. The component mapping table
description may include the following elements and attributes. A
service_id attribute may indicate the identifier of a service
associated with a component. BroadcastComp may indicate one or more
components transmitted through the same broadcast stream.
BroadcastComp may include mpdID, perID, reptnID, baseURL and/or
datapipeID attributes. The mpdID attribute may indicate a DASH MPD
identifier associated with BroadcastComp. The perID attribute may
indicate an associated period identifier in a relevant MPD. The
reptnID attribute may indicate a DASH representation identifier
associated with a relevant component. The baseURL attribute may
indicate a base URL of a DASH segment associated with the
component. The datapipeID attribute may indicate the identifier of
a data pipe carrying relevant component data in a broadcast
stream.
[0937] BBComp may indicate one or more components transmitted
through a broadband network. BBComp may include mpdID, perID,
reptnID and/or baseURL attributes. The mpdID attribute may indicate
a DASH MPD identifier associated with BBComp. The perID attribute
may indicate an associated period identifier in the MPD. The
reptnID attribute may indicate a DASH representation identifier
associated with a relevant component. The baseURL attribute may
indicate a base URL of a DASH segment associated with the
component.
[0938] ForeignComp may indicate one or more components transmitted
through other broadcast streams. ForeignComp may include mpdID,
perID, reptnID, baseURL, transportStreamID, sourceIPAddr,
destIPAddr, destUDPPort and/or datapipeID attributes. The mpdID
attribute may indicate a DASH MPD identifier associated with
ForeignComp. The perID attribute may indicate an associated period
identifier in the MPD. The reptnID attribute may indicate a DASH
representation identifier associated with a relevant component. The
baseURL attribute may indicate a base URL of a DASH segment
associated with the component. The transportStreamID attribute may
indicate the identifier of a broadcast stream including relevant
component data. The sourceIPAddr attribute may indicate a source IP
address of IP datagrams carrying the component data. The destIPAddr
attribute may indicate a destination IP address of the IP datagrams
carrying the component data. The destUDPPort attribute may indicate
a destination UDP port number of the IP datagrams carrying the
component data. The datapipeID attribute may indicate the
identifier of a data pipe through which the component data is
transmitted in the broadcast stream. The aforementioned component
mapping description may be transmitted by being encapsulated in an
XML file or the above-described signaling message format. As shown
in the lower part of FIG. 57, a signaling message header can have
the aforementioned format and the component mapping description or
part thereof may be included in the service message part. The CMT
may define components associated with each service and signal, to
the receiver, locations or paths where the corresponding components
can be received through the aforementioned information.
[0939] FIG. 58 illustrates a syntax of the component mapping table
of the future broadcast system according to an embodiment of the
present invention. The future broadcast system may signal the
component mapping table such that the receiver can acquire
components of broadcast services. The component mapping table may
be represented in binary, XML or other formats and encapsulated in
the aforementioned signaling message format. The component mapping
table may include the following fields. A CMT_portocol_version
field may indicate the version of the structure of the component
mapping table (CMT). A service_id field may indicate the identifier
of a service related to a component position provided by the
corresponding CMT. A CMT_data_version field may indicate the data
version of the CMT. A num_broadcast_streams field may indicate the
number of broadcast streams including at least one component
related to a relevant service. A TSID field may indicate a
transport session identifier of a relevant broadcast stream. A
num_partitions field may indicate the number of partitions of a
broadcast stream including at least one component related to the
relevant service. The CMT may include a plurality of partitions. A
partition_id field may indicate the identifier of a partition. A
num_data_pipes field may indicate the number of data pipes in a
partition including at least one component related to the service.
A DP_ID field may indicate the identifier of each data pipe. A
num_ROUTE_sessions field may indicate the number of transport
sessions (e.g. ROUTE sessions) included in each data pipe. Each
data pipe may include at least one component associated with the
service. An IP_address field may indicate the IP address of each
transport session. A UDP_port field may indicate a UDP port of each
transport session. A num_LCT_channels field may indicate the number
of LCT channels in a transport session including a component
associated with the service. An LCT_TSI field may indicate a
transport session identifier (TSI). A Representation_ID field may
indicate the identifier of representation carried by a relevant LCT
channel. An Internet_availability field may be an identifier
indicating whether relevant representation can be received through
the Internet or broadband. A num_internet_only_reptns field may
indicate the number of representations which can be received only
through the Internet or broadband. A Representation_ID field may
indicate the identifier of representation which can be received
only through the Internet or broadband in a loop of
num_internet_only_reptns. The CMT may define components associated
with each service and signal, to the receiver, locations or paths
where the components can be received through the aforementioned
information.
[0940] FIG. 59 illustrates a method of delivering signaling related
each service through a broadband network in the future broadcast
system according to an embodiment of the present invention. The
future broadcast system may transmit signaling related to a service
to the receiver through a broadband network. The future broadcast
system may transmit signaling to the receiver through the broadband
network using a URL signaling table description. The URL signaling
table description may be represented in XML or binary format. The
URL signaling table description may include the following
attributes. A service_id attribute may indicate the identifier of a
service associated with signaling. An mpdURL attribute may indicate
the URL of broadband MPD. A cstURL attribute may indicate the URL
of a broadband CMT. The CMT may include information about a path
through which component data in a broadcast service is acquired. An
astURL attribute may indicate the URL of a broadband AST. The AST
may include information about an application related to a broadcast
service. The receiver may receive the description and receive
signaling on the basis of the URL of the signaling. The
aforementioned URL signaling table description may be encapsulated
in a single XML file or the aforementioned signaling message format
and transmitted. As shown in the lower part of the figure, a
signaling message header may take the aforementioned format and the
URL signaling table description or part thereof may follow the
signaling message header.
[0941] FIG. 60 illustrates a method of signaling MPD in the future
broadcast system according to an embodiment of the present
invention. As shown in the upper part of the figure, a signaling
message about MPD of a broadcast service available in a future
broadcast network may include a signaling message header and the
signaling message. The signaling message header may take the
aforementioned format and MPD delivery table information may
include the following information. Signaling_id information may
indicate that the signaling message is a signaling message
including MPD or information about a path through which the MPD can
be acquired. protocol_version information may indicate a protocol
version of an MPD delivery table, such as the syntax of the
signaling message. Signaling_version information may indicate a
change of signaling data of the MPD delivery table. Service_id
information may indicate the identifier of a service associated
with the signaling information. Mpd_id information may indicate the
identifier of DASH MPD associated with the signaling message.
MPD_version information may be version information indicating a
change of the MPD. Delivery_mode information may indicate whether
the signaling message includes the MPD or is delivered through a
different path. MPD_data( ) information may include MPD data when
the signaling message includes the MPD. MPD_path information may
include information about a path through which the MPD can be
acquired. For example, the path may indicate a URL.
[0942] The MPD delivery table description may include the following
information. A service_id attribute may indicate the identifier of
a service associated with signaling. An MPD_id attribute may
indicate the identifier of the MPD. MPD_version may be version
information indicating a change of the MPD. An MPD_URL attribute
may include information about a URL through which the MPD can be
acquired. An MPD element may include MPD information. The MPD
delivery table description may be encapsulated in a single XML file
or the aforementioned signaling message format and transmitted.
That is, the signaling message header may take the aforementioned
format and the MPD delivery table description or part thereof may
follow the signaling message header.
[0943] FIG. 61 illustrates a syntax of an MPD delivery table of the
future broadcast system according to an embodiment of the present
invention. Information of the MPD delivery table or part thereof
may follow a signaling message header. The information of the MPD
delivery table may include the following fields. A service_id field
may indicate the identifier of an associated broadcast service. An
MPD_id_length field may indicate the length of the following
MPD_id_bytes( ). An MPD_id_bytes field may indicate the identifier
of an MPD filed included in a signaling message. An MPD_version
field may indicate version information such as a change of data of
the MPD. An MPD URL availability field may indicate presence or
absence of URL information of the MPD in the signaling
table/message. An MPD_data_availabilty field may indicate whether
the signaling table/message includes the MPD. The
MPD_data_availabilty field may indicate that the signaling
table/message includes the MPD when the value thereof is 1. An
MPD_URL_length field may indicate the length of the following
MPD_URL_bytes( ). An MPD_URL_bytes field may indicate an MPD URL
included in the signaling message. An MPD_coding field may indicate
an encoding scheme of an MPD field included in the signaling
message. As shown in the lower part of the figure, an MPD file may
be encoded according to different encoding schemes according to
values of the MPD_coding field. For example, an MPD_coding field
value of "0x00" may indicate that the signaling table/message
includes a plain MPD field represented in XML. An MPD_coding field
value of "0x01" may indicate that the signaling table/message
includes an MPD field compressed by gzip. If an MPD field
compressed by gzip is segmented and respectively transmitted
through a plurality of messages/tables, the multiple MPD_bytes( )
may be concatenated and then ungzipped. An MPD_byte_length field
may indicate the length of the following MPD_bytes( ). An MPD_bytes
field may include data of an MPD file included in the signaling
message according to the encoding scheme indicated by the
MPD_coding field. The future broadcast system enables the receiver
to receive or acquire a service related MPD through the MPD
delivery table including the aforementioned fields.
[0944] FIG. 62 illustrates transport session instance description
of the future broadcast system according to an embodiment of the
present invention. When an application layer transmission method
corresponds to real-time object delivery over unidirectional
transport (ROUTE), a ROUTE session may be composed of one or more
layered coding transport (LCT) sessions. Detailed information about
one or more transport sessions may be signaled through transport
session instance description. In the case of ROUTE, the transport
session instance description may be referred to as LCT session
instance description (LSID). Particularly, the transport session
instance description may define what is delivered through each LCT
transport session constituting the ROUTE session. Each transport
session may be uniquely identified by a transport session
identifier (TSI). The TSI may be included in an LCT header. The
transport session instance description may describe all transport
sessions carried by the corresponding session. For example, LSID
may describe all LCT sessions carried by a ROUTE session. The
transport session instance description may be delivered through the
same ROUTE session as transport sessions or through a different
ROUTE session or unicast.
[0945] When delivered through the same ROUTE session, the transport
session instance description may be delivered through a transport
session having a TSI of 0. While an object referred to in the
transport session instance description may be delivered through the
transport session with TSI=0, the object may have a TOI value
different from that of the transport session instance description.
Otherwise, the object may be delivered through a separate transport
session with TSI.noteq.0. The transport session instance
description may be updated using at least one of the version
number, validity information and expiration information. The
transport session instance description may be represented in a
bitstream in addition to the illustrated format.
[0946] The transport session instance description may include
version, validFrom and expiration attributes and include a TSI
attribute and SourceFlow and RepairFlow information with respect to
each transport session. The version attribute may indicate the
version information of the transport session instance description,
and the version information may increase whenever contents thereof
are updated. Transport session instance description having a
highest version number is the currently valid version. The
validFrom attribute may indicate the data and time from which the
corresponding transport session instance description is valid. The
validFrom attribute may not be included in the transport session
instance description according to embodiment. In this case, it may
be possible to represent that the transport session instance
description is valid immediately after being received. The
expiration attribute may indicate the date and time when the
corresponding transport session instance description expires. The
expiration attribute may not be included in the transport session
instance description according to embodiment. In this case, it may
be possible to represent that the corresponding transport session
instance description is continuously valid. If transport session
instance description having an expiration attribute is received,
the transport session instance description may conform to the
corresponding expiration attribute. The TSI attribute may indicate
a transport session identifier. A SourceFlow element provides
information of a source flow transmitted with the corresponding
TSI. The SourceFlow element will be described in detail below. A
RepairFlow element may provide information of a repair flow
transmitted with the corresponding TSI.
[0947] FIG. 63 illustrates shows a SourceFlow element of the future
broadcast system according to an embodiment of the present
invention. The Sourceflow element may include an EFDT element, an
idRef attribute, a realtime attribute, a minBufferSize attribute,
an Application Identifier element and a PayloadFormat element. The
EFDT element may specify detailed information of file delivery
data. The EFDT element indicates an extended file delivery table
(FDT) instance and will be described in detail below. The idRef
attribute may indicate an EFDT identifier and may be represented as
a URI by the corresponding transport session. The realtime
attribute may indicate that corresponding LCT packets include
extension headers. The extended headers may include timestamps
indicating presentation time of an included delivery object. The
minBufferSize attribute may define the maximum amount of data that
needs to be stored in the receiver. The Application Identifier
element may provide additional information that may be mapped to
the application carried in the corresponding transport session. For
example, representation ID of DASH content or Application Set
parameters of a DASH representation may be provided as additional
information in order to select a transport session for rendering.
The PayloadFormat element may define payload formats of ROUTE
packets carrying objects of the source flow. The PayloadFormat
element may include a codePoint attribute, a deliveryObjectFormat
attribute, a fragmentation attribute, a deliveryOrder attribute, a
sourceFecPayloadID attribute and/or an FECParameters element. The
codePoint attribute may define a code point used in the
corresponding payload. This may indicate the value of the CP field
in the LCT header. The deliveryObjectFormat attribute may indicate
the payload format of the corresponding delivery object. The
fragmentation attribute may define the type of fragmentation. The
deliveryOrder attribute may indicate the order of delivery of
objects. The sourceFecPayloadID attribute may define the format of
a source FEC payload identifier. The FECParameters element may
define FEC parameters. This includes an FEC encoding id, an
instance id, etc.
[0948] FIG. 64 shows an EFDT of the future broadcast system
according to an embodiment of the present invention. The EFDT may
include detailed information of file delivery data. The EFDT may
include an idRef attribute, a version attribute, a maxExpiresDelta
attribute, a maxTransportSize attribute and a FileTemplate element.
The idRef attribute may indicate the identifier of the EFDT. The
version attribute may indicate the version of an EFDT instance
descriptor. This attribute may be increased by 1 when the EFDT is
updated. A received EFDT with the highest version number may be the
currently valid version. The maxExpiresDelta attribute may indicate
a maximum expiry time for an object after sending a first packet
associated to the object. The maxTransportSize attribute may
indicate a maximum transport size of an object described by the
corresponding EFDT. The FileTemplate element may specify the file
URL or file template in the body.
[0949] The aforementioned transport session instance descriptor
(LSID) element may be transmitted by a transport session instance
descriptor (LSID) table shown in the lower part of the figure. The
LSID table may be delivered through the aforementioned signaling
message which is divided into a signaling message header and a
signaling message data part. The signaling message data part may
include the transport session instance descriptor (LSID) or part
thereof. Signaling message data may include the LSID table and the
following fields. A Signaling_id field is identifier information
indicating that the corresponding table is a signaling table
including the LSID. A protocol_version field may indicate the
protocol version of signaling, such as a signaling syntax including
the LSID. A Signaling_version field may indicate a change of
signaling data including the LSID. In addition, the LSID table may
further include the contents of the aforementioned transport
session instance descriptor (LSID) element.
[0950] FIG. 65 illustrates a method for transmitting an
initialization segment delivery table (ISDT) used in the future
broadcast system according to an embodiment of the present
invention. The future broadcast system may deliver signaling
information about an initialization segment of DASH representation
associated with a component in a broadcast service by transmitting
an ISDT. The signaling information about the initialization segment
of DASH representation associated with the component in the
broadcast service may include a header and data. The signaling
message header may have the aforementioned format and the signaling
message data may include initialization segment delivery
information or part thereof. The initialization segment delivery
information may include the following information. Signaling_id
information may identify a signaling message including the
initialization segment or information on the path thereof
protocol_version information may indicate the protocol version of
the ISDT, such as the syntax of the corresponding signaling
message. Sequence_number information may indicate the instance
identifier of the ISDT. Signaling_version information may indicate
a change of signaling data of the ISDT. Service_id information may
identify a service associated with the corresponding component.
Mpd_id information may indicate a DASH MPD identifier associated
with the corresponding component. period_id information may
indicate a DASH Period identifier associated with the corresponding
component. representation_id information may indicate a DASH
representation identifier associated with the corresponding
component. Initialization_segment_version information may be
version information indicating a change of the corresponding MPD.
Delivery_mode information may indicate whether the ISDT includes
the initialization segment or is delivered through a different
path. Initialization_segment_data( ) information may include the
initialization segment data itself. Initialization segment path
information may include information about a path through which the
initialization segment may be acquired, such as the URL of the
initialization segment. The receiver may receive information about
the initialization segment of DASH representation associated with
the corresponding component through the ISDT.
[0951] FIG. 66 illustrates a delivery structure of a signaling
message of the future broadcast system according to an embodiment
of the present invention. The aforementioned signaling data may be
delivered as illustrated when transmitted based on application
layer transport, for example, ROUTE. That is, some signaling may be
transmitted through a fast information channel in order to support
fast service scan. Some signaling may be transmitted through a
specific transport session and delivered along with component
data.
[0952] Signaling information for supporting fast service scan and
acquisition may be received through a separate channel from a
transport session. Here, the separate channel may refer to a
separate data pipe (DP). Detailed information about a service may
be received through a separate designated transport session. Here,
the transport session may have a value of TSI=0. Information
delivered through the designated transport session may include an
MPD delivery table, an application signaling table, a transport
session instance description table and/or a component mapping
table. Some signaling information may be delivered through a
transport session along with component data. For example, the
initialization segment delivery table may be delivered along with
component data.
[0953] The lower part of the figure illustrates an example of
acquiring broadcast services in the future broadcast network. When
a service is selected, the receiver may tune to broadcast, acquire
information for fast service scan and acquisition and parse the
information. Upon determination of the location of service layer
signaling or transport session instance description (TSID or LSID)
from the information for fast service scan and acquisition, the
receiver may acquire and parse the corresponding description. In
addition, the receiver may check the transport session including
the signaling, acquire a signaling table from the transport
session, parse the signaling table and determine a desired
component. Through this process, the receiver may present the
desired component. That is, broadcast services may be provided to a
user by acquiring information about a transport session from
information for fast service scan and acquisition, confirming the
location of a desired component from the information about the
transport session and reproducing the component.
[0954] FIG. 67 shows signaling data transmitted, by the future
broadcast system according to an embodiment of the present
invention, for fast broadcast service scan. FIC information
(service acquisition information) for supporting fast broadcast
service scan and service/component acquisition may include
information about an application layer transport session delivering
services and component data. As illustrated, the FIC information
may be represented in a binary format. However, the FIC information
may be represented in other formats such as XML according to
embodiments. The FIC information may include the following fields.
An FIC_portocol_version field may indicate the version of the
structure of signaling information. A TSID field may indicate the
identifier of a broadcast stream. An FIC_data_version field may
indicate the data version of the corresponding FIC information. An
FIC_data_version field may be increased when the contents of the
FIC are changed. A num_partitions field may indicate the number of
partitions of a broadcast stream. It is assumed that each broadcast
stream may be divided into one or more partitions and transmitted
in order to use the num_partitions field. Each partition may
include a plurality of DPs by a single broadcaster. Each partition
may indicate a part of a broadcast steam, used by a single
broadcaster. A partition_id field may indicate the identifier of
the corresponding partition. A partition_protocol_version field may
indicate the version of the aforementioned partition structure. A
num_services field may indicate the number of one or more
components included in the corresponding partition. A service_id
field may indicate a service identifier. A service_data_version
field may indicate a change of service loop data in the FIC or a
change of service signaling data associated with the corresponding
service. A service_data_version field may be increased by 1
whenever included service data is changed. The receiver may detect
a service loop data change of the FIC or a change of signaling
associated with the corresponding service using the
service_data_version field. A channel_number field may indicate the
channel number associated with the corresponding service. A
service_category field may indicate the category of the
corresponding service. For example, the service_category field may
indicate A/V, audio, ESG, CoD, etc. A short_service_name_length
field may indicate the length of the name of the corresponding
service. A short_service_name field may indicate the name of the
corresponding service. A service status field may indicate the
status of the corresponding service and represent an active or
suspended attribute and a hidden or shown attribute according to
the value thereof. A service_distribution field may have an
attribute similar to "multi-ensemble" flag of ATSC M/H. For
example, the service_distribution field may indicate information
about whether the corresponding service is included in the
corresponding partition, the service is presentable only with the
corresponding partition although the service is partially included
in the partition, another partition is necessary for presentation,
or other broadcast streams are necessary for presentation. An
sp_indicator field is a service protection flag and may indicate
whether one or more components necessary for presentation are
protected. An IP_version_flag field may indicate the following IP
address format. The IP_version_flag field may indicate that IPv4 is
used when the value thereof is 0 and indicate that IPv6 is used
when the value thereof is 1. A source_IP_address_flag field may
indicate whether the FIC information includes source_IP_addr. The
source_IP_address_flag field may indicate presence of
source_IP_addr when the value thereof is 1. A num_transport_session
field may indicate the number of transport sessions (e.g. ROUTE or
MMTP sessions) in which component data of the corresponding service
is transmitted in a broadcast stream. A source_IP_addr field may
indicate the source IP address of an IP datagram including the
component data of the corresponding service when the
source_IP_address_flag is 1. A dest_IP_addr field may indicate the
destination IP address of the IP datagram including the component
data of the corresponding service. A dest_UDP_port field may
indicate the UDP port number of the IP datagram including the
component data of the corresponding service. An LSID_DP field may
indicate the identifier of a data pipe of a physical layer, which
delivers signaling including detailed information about a transport
session. In the case of ROUTE, for example, the signaling including
the detailed information about the transport session may be LCT
session instance description including information about an LCT
transport session of a ROUTE session. An LSID_tsi field may
indicate the identifier of a transport session through which
transport session instance description that is signaling including
detailed information about transport sessions is transmitted. Here,
the transport session instance description may be LSID in the case
of an LCT transmission session. In addition, signaling associated
with the corresponding service may be delivered through the
transport session in which the transport session instance
description is transmitted. A service_signaling_flag field may
indicate whether service signaling is transmitted through the
corresponding transport session. The service_signaling_flag field
may indicate presence of a DP including service signaling when the
value thereof is 1. A signaling_data_version field may indicate a
change of related service signaling data. The value of the
signaling_data_version field may increase by 1 whenever the service
signaling data is changed. The receiver may detect a change of
signaling related to the corresponding service using the
signaling_data_version field. A signaling_DP field may indicate the
identifier of a data pipe of the physical layer, which delivers
service signaling. A signaling_tsi field may indicate the
identifier of a transport session delivering service signaling. A
transport session descriptors field may include transport session
level descriptors. Each descriptor may be extended and include a
num_descriptors field. Each descriptor may include as many
descriptor loops as the number indicated by the num_descriptors
field. The transport session descriptors field may include
transport session level descriptors. A service descriptors field
may include service level descriptors. A partition descriptors
field may include a partition level descriptor, and one partition
may indicate part of broadcast streams used by a single
broadcaster. An FIC session descriptors field may include FIC level
descriptors. According to an embodiment, the fields included in the
FIC may be included in a table other than the FIC and transmitted
along with a broadcast signal.
[0955] FIG. 68 shows signaling data transmitted, by the future
broadcast system according to an embodiment of the present
invention, for fast broadcast service scan. FIC information
(service acquisition information) for supporting fast broadcast
service scan and service/component acquisition may include
information about an application layer transport session delivering
service and component data. As illustrated, the FIC information may
be represented in a binary format. However, the FIC information may
be represented in other formats such as XML according to
embodiments. The FIC information may include the following fields.
An FIC_portocol_version field may indicate the version of the
structure of signaling information. A num_partitions field may
indicate the number of partitions of a broadcast stream. It is
assumed that each broadcast stream may be divided into one or more
partitions and transmitted in order to use the num_partitions
field. Each partition may include a plurality of DPs by a single
broadcaster. Each partition may indicate a part of a broadcast
steam, used by a single broadcaster. A partition_id field may
indicate the identifier of the corresponding partition. A
partition_protocol_version field may indicate the version of the
aforementioned partition structure. A num_services field may
indicate the number of one or more services included in the
corresponding partition. Each service may include a plurality of
signaling tables. For example, each service may include DASH MPD
containing components and information about segments thereof, a CMT
containing identifiers of components included in broadband and
other broadcast streams, an application signaling table (AST) and a
URL signaling table (UST) including at least one of the URLs of the
MPD, CMT and AST. These signaling tables may be included in a
signaling channel of the corresponding service. A service_id field
may indicate a service identifier. A service_data_version field may
indicate a change of service loop data in the FIC or a change of
service signaling data associated with the corresponding service. A
service_data_version field may be increased by 1 whenever included
service data is changed. For example, a service_data_version field
may be increased by 1 when the FIC, MPD, CMT, AST or UST is
changed. The receiver may detect a service loop data change of the
FIC or a change of signaling associated with the corresponding
service using the service_data_version field. A
service_channel_number field may indicate the channel number
associated with the corresponding service. A service_category field
may indicate the category of the corresponding service. For
example, the service_category field may indicate A/V, audio, ESG,
CoD, etc. A short_service_name_length field may indicate the length
of the name of the corresponding service. A short_service_name
field may indicate the name of the corresponding service. A
service_status field may indicate the status of the corresponding
service and represent an active or suspended attribute and a hidden
or shown attribute according to the value thereof. A
service_distribution field may have an attribute similar to the
"multi-ensemble" flag of ATSC M/H. For example, the
service_distribution field may indicate information about whether
the corresponding service is included in the corresponding
partition, the service is presentable only with the corresponding
partition although the service is partially included in the
partition, another partition is necessary for presentation, or
other broadcast streams are necessary for presentation. An
sp_indicator field is a service protection flag and may indicate
whether one or more components necessary for presentation are
protected. An IP_version_flag field may indicate the following IP
address format. The IP_version_flag field may indicate that IPv4 is
used when the value thereof is 0 and indicate that IPv6 is used
when the value thereof is 1. A num_ROUTE_sessions field may
indicate the number of transport sessions delivering component data
of the corresponding service in a broadcast stream. For example,
transport session may be ROUTE sessions. The following information
may be set per ROUTE session. A source_IP_addr field may indicate
the source IP address of an IP datagram including the component
data of the corresponding service. A dest_IP_addr field may
indicate the destination IP address of the IP datagram including
the component data of the corresponding service. A dest_UDP_port
field may indicate the UDP port number of the IP datagram including
the component data of the corresponding service. An LSID_DP field
may indicate the identifier of a data pipe of a physical layer,
which delivers signaling including detailed information about a
transport session. In the case of ROUTE, for example, the signaling
including the detailed information about the transport session may
be LCT session instance description including information about an
LCT transport session of a ROUTE session. An LSID_tsi field may
indicate the identifier of a transport session through which
transport session instance description that is signaling including
detailed information about transport sessions is transmitted. Here,
the transport session instance description may be LSID in the case
of an LCT transmission session. In addition, signaling associated
with the corresponding service may be delivered through the
transport session in which the transport session instance
description is transmitted. A component_signaling_flag field may
indicate whether service signaling of the corresponding service is
transmitted through the corresponding transport session. When the
component_signaling_flag is 1, this may indicate that data
transmitted through the corresponding transport session includes
service signaling (e.g. MPD (DASH Media Presentation Description),
CMT or the like). Here, the CMT is a component mapping table and
may include identifiers of components delivered through broadband
and also include information about components included in other
broadcast streams. Each service may include service signaling
channels. The service signaling channels may include an MPD, a CMT,
an AST and/or a UST. A service signaling channel may be a signaling
channel from among a plurality of route sessions for services, and
presence or absence thereof may be indicated through the component
signaling flag. When signaling and service components are
transmitted through a plurality of transport sessions (ROUTE or
MMTP sessions), the aforementioned service signaling tables may be
preferably delivered by a single transport session.
[0956] A ROUTE session descriptors field may include transport
session level descriptors. Each descriptor may be extended and
include a num_descriptors field. Each descriptor may include as
many descriptor loops as the number indicated by the
num_descriptors field. A transport session descriptors field may
include transport session level descriptors. A service descriptors
field may include service level descriptors. A partition
descriptors field may include a partition level descriptor, and one
partition may indicate part of broadcast streams used by a single
broadcaster. An FIC session descriptors field may include FIC level
descriptors.
[0957] According to an embodiment, the fields included in the FIC
may be included in a table other than the FIC and transmitted along
with a broadcast signal.
[0958] FIG. 69 illustrates component mapping table description
according to an embodiment of the present invention. Component
mapping description may signal information about transport paths of
components included in broadcast services in the future broadcast
system. Component mapping table description may be represented in
XML format or a binary bitstream. Component mapping table
description may include the following elements and attributes. A
service_id attribute may indicate the identifier of a service
associated with a component. BroadcastComp may indicate one or more
components transmitted through the same broadcast stream.
BroadcastComp may include mpdID, perID, reptnID, baseURL and/or
datapipeID attributes. The mpdID attribute may indicate a DASH MPD
identifier associated with BroadcastComp. The perID attribute may
indicate an associated period identifier in corresponding MPD. The
reptnID attribute may indicate a DASH representation identifier
associated with the corresponding component. The baseURL attribute
may indicate a base URL of segments constituting DASH
representation associated with the corresponding component. The
datapipeID attribute may indicate the identifier of a data pipe
carrying corresponding component data in a broadcast stream.
[0959] BBComp may indicate one or more components transmitted
through a broadband network. BBComp may include mpdID, perID,
reptnID and/or baseURL attributes. The mpdID attribute may indicate
a DASH MPD identifier associated with BBComp. The perID attribute
may indicate an associated period identifier in corresponding MPD.
The reptnID attribute may indicate a DASH representation identifier
associated with the corresponding component. The baseURL attribute
may indicate a base URL of segments constituting DASH
representation associated with the corresponding component.
[0960] ForeignComp may indicate one or more components transmitted
through other broadcast streams. ForeignComp may include mpdID,
perID, reptnID, baseURL, transportStreamID, sourceIPAddr,
destIPAddr, destUDPPort and/or datapipeID attributes. The mpdID
attribute may indicate a DASH MPD identifier associated with
ForeignComp. The perID attribute may indicate an associated period
identifier in corresponding MPD. The reptnID attribute may indicate
a DASH representation identifier associated with the corresponding
component. The baseURL attribute may indicate a base URL of
segments constituting DASH representation associated with the
corresponding component. The transportStreamID attribute may
indicate the identifier of a broadcast stream including
corresponding component data. The sourceIPAddr attribute may
indicate a source IP address of IP datagrams carrying the
corresponding component data. The destIPAddr attribute may indicate
a destination IP address of the IP datagrams carrying the
corresponding component data. The destUDPPort attribute may
indicate a destination UDP port number of the IP datagrams carrying
the corresponding component data. The datapipeID attribute may
indicate the identifier of a data pipe through which the
corresponding component data is transmitted in the corresponding
broadcast stream. The sourceIPAddr, destIPAddr, destUDPPort and
datapipeID attributes may be optional according to embodiments and
selectively included in the CMT. The aforementioned component
mapping description may be transmitted by being encapsulated in an
XML file or the above-described signaling message format. As shown
in the lower part of the figure, a signaling message header may
have the aforementioned format and component mapping description or
part thereof may be included in the service message part. The CMT
may define components associated with each service and signal, to
the receiver, locations or paths where the corresponding components
may be received through the aforementioned information.
[0961] FIG. 70 illustrates component mapping table description
according to an embodiment of the present invention. Component
mapping description may signal information about transport paths of
components included in broadcast services in the future broadcast
system. Component mapping table description may be represented in
XML format or a binary bitstream. Component mapping table
description may include the following elements and attributes. A
service_id attribute may indicate the identifier of a service
associated with a component. BroadcastComp may indicate one or more
components transmitted through the same broadcast stream.
BroadcastComp may include mpdID, perID, reptnID, baseURL, tsi
and/or datapipeID attributes. The mpdID attribute may indicate a
DASH MPD identifier associated with BroadcastComp. The perID
attribute may indicate an associated period identifier in
corresponding MPD. The reptnID attribute may indicate a DASH
representation identifier associated with the corresponding
component. The baseURL attribute may indicate a base URL of
segments constituting DASH representation associated with the
corresponding component. The tsi attribute may indicate the
identifier of a transport session through which corresponding
component data is transmitted in a broadcast stream. The datapipeID
attribute may indicate the identifier of a data pipe carrying the
corresponding component data in the broadcast stream.
[0962] BBComp may indicate one or more components transmitted
through a broadband network. BBComp may include mpdID, perID,
reptnID and/or baseURL attributes. The mpdID attribute may indicate
a DASH MPD identifier associated with BBComp. The perID attribute
may indicate an associated period identifier in corresponding MPD.
The reptnID attribute may indicate a DASH representation identifier
associated with the corresponding component. The baseURL attribute
may indicate a base URL of segments constituting DASH
representation associated with the corresponding component.
[0963] ForeignComp may indicate one or more components transmitted
through other broadcast streams. ForeignComp may include mpdID,
perID, reptnID, baseURL, transportStreamID, sourceIPAddr,
destIPAddr, destUDPPort, tsi and/or datapipeID attributes. The
mpdID attribute may indicate a DASH MPD identifier associated with
ForeignComp. The perID attribute may indicate an associated period
identifier in corresponding MPD. The reptnID attribute may indicate
a DASH representation identifier associated with the corresponding
component. The baseURL attribute may indicate a base URL of
segments constituting DASH representation associated with the
corresponding component. The transportStreamID attribute may
indicate the identifier of a broadcast stream including
corresponding component data. The sourceIPAddr attribute may
indicate a source IP address of IP datagrams carrying the
corresponding component data. The destIPAddr attribute may indicate
a destination IP address of the IP datagrams carrying the
corresponding component data. The destUDPPort attribute may
indicate a destination UDP port number of the IP datagrams carrying
the corresponding component data. The tsi attribute may indicate
the identifier of a transport session through which the
corresponding component data is transmitted in the corresponding
broadcast stream. The datapipeID attribute may indicate the
identifier of a data pipe through which the corresponding component
data is transmitted in the corresponding broadcast stream. The
sourceIPAddr, destIPAddr, destUDPPort and datapipeID attributes may
be optional according to embodiments and selectively included in
the CMT. The aforementioned component mapping description may be
transmitted by being encapsulated in an XML file or the
above-described signaling message format. As shown in the lower
part of the figure, a signaling message header may have the
aforementioned format and component mapping description or part
thereof may be included in the service message part. The CMT may
define components associated with each service and signal, to the
receiver, locations or paths where the corresponding components may
be received through the aforementioned information.
[0964] FIGS. 71 and 72 illustrate component mapping table
description according to an embodiment of the present invention.
Component mapping description may signal information about
transport paths of components included in broadcast services in the
future broadcast system. Component mapping table description may be
represented in XML format or as a binary bitstream. Component
mapping table description may include a delivery parameter element
and a payload format element along with the DASH associated
identifiers.
[0965] Component mapping table description may include the
following elements and attributes. A service_id attribute may
indicate the identifier of a service associated with a component. A
component element may indicate components in the corresponding
broadcast service. The component element may include an mpdID
attribute, a perID attribute, a reptnID attribute, a baseURL
attribute, the delivery parameter element and/or the payload format
element. The mpdID attribute may indicate a DASH MPD identifier
associated with a component. The perID attribute may indicate an
associated period identifier in corresponding MPD. The reptnID
attribute may indicate a DASH representation identifier associated
with the corresponding component. The baseURL attribute may
indicate a base URL of segments constituting DASH representation
associated with the corresponding component.
[0966] The delivery parameter element may include detailed
information about a path through which the corresponding component
is transmitted. The delivery parameter element may include
transportStreamID, sourceIPAddr, destIPAddr, destUDPPort, tsi,
datapipeID and/or URL attributes. The transportStreamID attribute
may indicate the identifier of a broadcast stream including
corresponding component data. The sourceIPAddr attribute may
indicate a source IP address of IP datagrams carrying the
corresponding component data. The destIPAddr attribute may indicate
a destination IP address of the IP datagrams carrying the
corresponding component data. The destUDPPort attribute may
indicate a destination UDP port number of the IP datagrams carrying
the corresponding component data. The tsi attribute may indicate
the identifier of a transport session through which the
corresponding component data is transmitted in the corresponding
broadcast stream. The datapipeID attribute may indicate the
identifier of a physical layer data pipe through which the
corresponding component data is transmitted in the corresponding
broadcast stream. The URL attribute may indicate URL information by
which the corresponding component data may be acquired through the
Internet. The sourceIPAddr, destIPAddr, destUDPPort, datapipeID
and/or URL attributes may be optional according to embodiments and
selectively included in the delivery parameter element.
[0967] The payload format element may include a codePoint
attribute, a deliveryObjectFormat attribute, a fragmentation
attribute, a deliveryOrder attribute, a sourceFecPayloadID
attribute and/or an FECParameters element. The codePoint attribute
may define a code point used in the corresponding payload. This may
indicate the value of the CP field of the LCT header. The
deliveryObjectFormat attribute may indicate the payload format of
the corresponding delivery object. The fragmentation attribute may
define the type of fragmentation. The deliveryOrder attribute may
indicate the order of delivery of objects. The sourceFecPayloadID
attribute may define the format of a source FEC payload identifier.
The FECParameters element may define FEC parameters and include an
FEC encoding id, an instance id, etc.
[0968] FIG. 73 illustrates component mapping table description
according to an embodiment of the present invention. Component
mapping description may signal information about transport paths of
components included in broadcast services in the future broadcast
system. Component mapping table description may be represented in
XML format or as a binary bitstream. Component mapping table may
include a service_id attribute, an mpd_id attribute, a per_id
attribute, a BroadcastComp element, a BBComp element and a
ForeignComp element. Component mapping table description may
include the following elements and attributes. The service_id
attribute may indicate the identifier of a service associated with
a component. The CMT description may include mpdID and perID
attributes at the same level as the service_id attribute. That is,
the mpdID and perID attributes commonly applied to the
BroadcastComp, BBComp and ForeignComp elements may be described at
the same level as the service_id attribute instead of being
redundantly described. The mpdID attribute may indicate a DASH MPD
identifier associated with the corresponding service. The perID
attribute may indicate an associated period identifier in
corresponding MPD.
[0969] BroadcastComp may indicate one or more components
transmitted through the same broadcast stream. BroadcastComp may
include reptnID, baseURL, tsi and/or datapipeID attributes. The
reptnID attribute may indicate a DASH representation identifier
associated with the corresponding component. The baseURL attribute
may indicate a base URL of segments constituting DASH
representation associated with the corresponding component. The tsi
attribute may indicate the identifier of a transport session
through which the corresponding component data is transmitted in
the corresponding broadcast stream. The datapipeID attribute may
indicate the identifier of a data pipe through which the
corresponding component data is transmitted in the corresponding
broadcast stream.
[0970] BBComp may indicate one or more components transmitted
through a broadband network. BBComp may include reptnID and/or
baseURL attributes. The reptnID attribute may indicate a DASH
representation identifier associated with the corresponding
component. The baseURL attribute may indicate a base URL of
segments constituting DASH representation associated with the
corresponding component.
[0971] ForeignComp may indicate one or more components transmitted
through other broadcast streams. ForeignComp may include reptnID,
baseURL, transportStreamID, sourceIPAddr, destIPAddr, destUDPPort,
tsi and/or datapipeID attributes. The reptnID attribute may
indicate a DASH representation identifier associated with the
corresponding component. The baseURL attribute may indicate a base
URL of segments constituting DASH representation associated with
the corresponding component. The transportStreamID attribute may
indicate the identifier of a broadcast stream including
corresponding component data. The sourceIPAddr attribute may
indicate a source IP address of IP datagrams carrying the
corresponding component data. The destIPAddr attribute may indicate
a destination IP address of the IP datagrams carrying the
corresponding component data. The destUDPPort attribute may
indicate a destination UDP port number of the IP datagrams carrying
the corresponding component data. The tsi attribute may indicate
the identifier of a transport session through which the
corresponding component data is transmitted in the corresponding
broadcast stream. The datapipeID attribute may indicate the
identifier of a data pipe through which the corresponding component
data is transmitted in the corresponding broadcast stream. The
sourceIPAddr, destIPAddr, destUDPPort and datapipeID attributes may
be optional according to embodiments and selectively included in
the CMT. The aforementioned component mapping description may be
transmitted by being encapsulated in an XML file or the
above-described signaling message format. The CMT may define
components associated with each service and inform the receiver of
locations or paths where the corresponding components may be
received through the aforementioned information.
[0972] FIG. 74 shows common attributes and elements of MPD
according to an embodiment of the present invention. The future
broadcast system may provide DASH based hybrid broadcast services.
In the future broadcast system, segments associated with
representation in DASH MPD are delivered through different
distribution paths. The common attributes and elements of the MPD
may be commonly present in adaptation set, representation and
sub-representation elements and include location information of
associated representation as illustrated. The future broadcast
system may enable a DASH client to recognize the associated
representation or locations of segments using the location
information of the associated representation, included in the
common attributes and elements of the MPD. The common attributes
and elements of the MPD may include the following attributes and
elements. @profiles attribute may indicate profiles of the
associated representation. @width attribute may indicate the
horizontal visual presentation size of a video media type to be
represented. @height attribute may indicate the vertical visual
presentation size of the video media type to be represented. @sar
attribute may indicate the sample aspect ratio of video media
component type. @frameRate attribute may indicate the output frame
rate of the video media type in the representation.
@audioSamplingRate attribute may indicate the sampling rate of an
audio media component type. @mimeType attribute may indicate the
MIME type of concatenation of the initialization segment.
@segmentProfiles attribute may indicate profiles of segments that
are essential to process the representation. @codecs attribute may
indicate the codec used in the representation. @maximumSAPPeriod
attribute may indicate the maximum stream access point (SAP)
interval of contained media streams. @startWithSAP attribute may
indicate the number of media segments that start with an SAP.
@maxPlayoutRate attribute may indicate the maximum playout rate.
@codingDependency attribute may indicate presence or absence of at
least one access unit that depends on one or more other access
units for decoding. @scanType attribute may indicate the scan type
of the source material of the video media component type. A
FramePacking element may specify frame-packing information of the
video media component type. An AudioChannelConfiguration element
may specify the audio channel configuration of the audio media
component type. A ContentProtection element may specify information
about content protection schemes used for the associated
representation. An EssentialProperty element may indicate
information about an element that is essentially considered in
processing. A SupplementalProperty element may specify supplemental
information used to optimize processing. An InbandEventStream
element may specify presence or absence of an inband event stream
in the associated representation. A Location element may specify
information on a location at which the associated representation
may be acquired. The Location element may include information about
a broadcast stream or physical channel data pipes carrying the
associated representation. The DASH client or the future broadcast
reception apparatus may obtain the associated representation using
the Location element. That is, the reception apparatus of the
future broadcast system may obtain information about the location
of the associated representation using location information
included in the common attributes and elements of the MPD without
using the aforementioned CMT and acquire the associated
representation on the basis of the obtained information. The
aforementioned representation may be described as a component
according to an embodiment.
[0973] In another embodiment, the future broadcast system may
allocate information about a transport path, such as the associated
representation, to a @servicelocation attribute of the base URL
element in the DASH MPD. The future broadcast system may enable the
DASH client to be aware of information about paths through which
segments associated with the corresponding representation are
delivered using @servicelocation attribute.
[0974] FIG. 75 illustrates transport session instance description
according to an embodiment of the present invention. When an
application layer transmission method corresponds to real-time
object delivery over unidirectional transport (ROUTE), a ROUTE
session may be composed of one or more layered coding transport
(LCT) sessions. Detailed information about one or more transport
sessions may be signaled through transport session instance
description. In the case of ROUTE, the transport session instance
description may be referred to as LCT session instance description
(LSID). Particularly, the transport session instance description
may define what is delivered through each LCT transport session
constituting the ROUTE session. Each transport session may be
uniquely identified by a transport session identifier (TSI). The
TSI may be included in an LCT header. The transport session
instance description may describe all transport sessions carried by
the corresponding session. For example, LSID may describe all LCT
sessions carried by ROUTE. The transport session instance
description may be delivered through the same ROUTE session as
transport sessions or through a different ROUTE session or
unicast.
[0975] When delivered through the same ROUTE session, the transport
session instance description may be delivered through a transport
session having a TSI of 0. While an object referred to in the
transport session instance description may be delivered through the
transport session with TSI=0, the object may have a TOI value
different from that of the transport session instance description.
Otherwise, the object may be delivered through a separate transport
session with TSI.noteq.0. The transport session instance
description may be updated using at least one of the version
number, validity information and expiration information. The
transport session instance description may be represented in a
bitstream in addition to the illustrated format.
[0976] The transport session instance description may include
version, validFrom and expiration attributes. For each transport
session, the transport session instance description may include a
TSI attribute, a SourceFlow element, a RepairFlow element and a
TransportSessionProperty element. The version attribute may
indicate the version information of the transport session instance
description, and the version information may increase whenever
contents thereof are updated. Transport session instance
description having a highest version number is the currently valid
version. The validFrom attribute may indicate the data and time
from which the corresponding transport session instance description
is valid. The validFrom attribute may not be included in the
transport session instance description according to embodiment. In
this case, the receiver may assume that the corresponding transport
session instance description is valid immediately. The expiration
attribute may indicate the date and time when the corresponding
transport session instance description expires. The expiration
attribute may not be included in the transport session instance
description. In this case, the receiver may assume that the
corresponding transport session instance description is valid for
all time. If transport session instance description having an
expiration attribute is received, the transport session instance
description may conform to the corresponding expiration attribute.
The TSI attribute may indicate a transport session identifier. The
SourceFlow element provides information of a source flow
transmitted with the corresponding TSI. The SourceFlow element will
be described in detail below. The RepairFlow element may provide
information of a repair flow transmitted with the corresponding
TSI. The TransportSessionProperty element may provide additional
property information about the corresponding transport session. The
transport session instance description may include additional
property information about a transport session in the
TransportSessionProperty element. For example, the additional
information may include service signaling information about the
transport session.
[0977] FIG. 76 illustrates shows a SourceFlow element of the future
broadcast system according to an embodiment of the present
invention. The Sourceflow element may include an EFDT element, an
idRef attribute, a realtime attribute, a minBufferSize attribute,
an Application Identifier element, a PayloadFormat element and/or a
SourceFlowProperty element. The EFDT element may specify detailed
information of file delivery data. The EFDT element indicates an
extended file delivery table (FDT) instance and will be described
in detail below. The idRef attribute may indicate an EFDT
identifier and may be represented as a URI by the corresponding
transport session. The realtime attribute may indicate that
corresponding LCT packets include extension headers. The extended
headers may include timestamps indicating presentation time of an
included delivery object. The minBufferSize attribute may define
the maximum amount of data that needs to be stored in the receiver.
The Application Identifier element may provide additional
information that may be mapped to the application carried in the
corresponding transport session. For example, representation ID of
DASH content or Application Set parameters of a DASH representation
may be provided as additional information in order to select a
transport session for rendering. The PayloadFormat element may
define payload formats of ROUTE packets carrying objects of the
source flow. The PayloadFormat element may include a codePoint
attribute, a deliveryObjectFormat attribute, a fragmentation
attribute, a deliveryOrder attribute, a sourceFecPayloadID
attribute and/or an FECParameters element. The codePoint attribute
may define a code point used in the corresponding payload. This may
indicate the value of the CP field in the LCT header. The
deliveryObjectFormat attribute may indicate the payload format of
the corresponding delivery object. The fragmentation attribute may
define the type of fragmentation. The deliveryOrder attribute may
indicate the order of delivery of objects. The sourceFecPayloadID
attribute may define the format of a source FEC payload identifier.
The FECParameters element may define FEC parameters. This includes
an FEC encoding id, an instance id, etc. The SourceFlowProperty
element may provide property information about the corresponding
source flow. For example, the property information may include
location information of a broadcast stream carrying the
corresponding source flow data. Here, the location information of
the broadcast stream may include information about a data pipe or
physical layer pipe (PLP) in the broadcast stream.
[0978] FIG. 77 shows signaling data transmitted, by the future
broadcast system according to another embodiment of the present
invention, for fast broadcast service scan. Illustrated service
acquisition information may further include information about link
layer signaling in addition to the aforementioned service
acquisition information. The information about link layer signaling
may include flag information indicating presence of link layer
signaling, version information of the link layer signaling data and
information about a data pipe or a PLP through which link layer
signaling is delivered. FIC information (service acquisition
information) for supporting fast broadcast service scan and
service/component acquisition may include information about an
application layer transport session delivering service and
component data. As illustrated, the service acquisition information
may be represented in a binary format. However, the FIC information
may be represented in other formats such as XML according to
embodiments.
[0979] The service acquisition information may include the
following fields. An FIC_portocol_version field may indicate the
version of the structure of signaling information. A TSID field may
indicate the identifier of a broadcast stream. An FIC_data_version
field may indicate the data version of the corresponding FIC
information. An FIC_data_version field may be increased when the
contents of the FIC are changed. A num_partitions field may
indicate the number of partitions of a broadcast stream. It is
assumed that each broadcast stream may be divided into one or more
partitions and transmitted in order to use the num_partitions
field. Each partition may include a plurality of DPs by a single
broadcaster. Each partition may indicate a part of a broadcast
steam, used by a single broadcaster. A partition_id field may
indicate the identifier of the corresponding partition. A
partition_protocol_version field may indicate the version of the
aforementioned partition structure. A num_services field may
indicate the number of one or more components included in the
corresponding partition. A service_id field may indicate a service
identifier. A service_data_version field may indicate a change of
service loop data in the FIC or a change of service signaling data
associated with the corresponding service. A service_data_version
field may be increased by 1 whenever included service data is
changed. The receiver may detect a service loop data change of the
FIC or a change of signaling associated with the corresponding
service using the service_data_version field. A channel number
field may indicate the channel number associated with the
corresponding service. A service_category field may indicate the
category of the corresponding service. For example, the
service_category field may indicate A/V, audio, ESG, CoD, etc. A
short_service_name_length field may indicate the length of the name
of the corresponding service. A short_service name field may
indicate the name of the corresponding service. A service_status
field may indicate the status of the corresponding service and
represent an active or suspended attribute and a hidden or shown
attribute according to the value thereof. A service_distribution
field may have an attribute similar to "multi-ensemble" flag of
ATSC M/H. For example, the service_distribution field may indicate
information about whether the corresponding service is included in
the corresponding partition, the service is presentable only with
the corresponding partition although the service is partially
included in the partition, another partition is necessary for
presentation, or other broadcast streams are necessary for
presentation. An sp_indicator field is a service protection flag
and may indicate whether one or more components necessary for
presentation are protected. An IP_version_flag field may indicate
the following IP address format. The IP_version_flag field may
indicate that IPv4 is used when the value thereof is 0 and may
indicate that IPv6 is used when the value thereof is 1. A
source_IP_address_flag field may indicate whether the FIC
information includes source_IP_addr. The source_IP_address_flag
field may indicate presence of source_IP_addr when the value
thereof is 1. A num_transport_session field may indicate the number
of transport sessions (e.g. ROUTE or MMTP sessions) in which
component data of the corresponding service is transmitted in a
broadcast stream. A source_IP_addr field may indicate the source IP
address of an IP datagram including the component data of the
corresponding service when the source_IP_address_flag is 1. A
dest_IP_addr field may indicate the destination IP address of the
IP datagram including the component data of the corresponding
service. A dest_UDP_port field may indicate the UDP port number of
the IP datagram including the component data of the corresponding
service. An LSID_DP field may indicate the identifier of a data
pipe of a physical layer, which delivers signaling including
detailed information about a transport session. In the case of
ROUTE, for example, the signaling including the detailed
information about the transport session may be LCT session instance
description including information about an LCT transport session of
a ROUTE session. An LSID_tsi field may indicate the identifier of a
transport session through which transport session instance
description, which is signaling including detailed information
about transport sessions, is transmitted. Here, the transport
session instance description may be LSID in the case of an LCT
transmission session. In addition, signaling associated with the
corresponding service may be delivered through the transport
session in which the transport session instance description is
transmitted. A service_signaling_flag field may indicate whether
service signaling is transmitted through the corresponding
transport session. The service_signaling_flag field may indicate
presence of a DP including service signaling when the value thereof
is 1. A signaling_data_version field may indicate a change of
related service signaling data. The value of the
signaling_data_version field may increase by 1 whenever the service
signaling data is changed. The receiver may detect a change of
signaling related to the corresponding service using the
signaling_data_version field. A signaling_DP field may indicate the
identifier of a data pipe of the physical layer, which delivers
service signaling. A signaling_tsi field may indicate the
identifier of a transport session delivering service signaling. A
link_layer_signaling_flag field may indicate whether the service
acquisition information carries link layer (or low layer)
signaling. A link_layer_signaling_data_version field may indicate a
change of associated link layer (or low layer) signaling data. This
field may be increased by 1 whenever the link layer signaling data
is changed. The receiver may detect variation in link layer (or low
layer) signaling using the link_layer_signaling_data_version field.
A link_layer_signaling_DP field may indicate the identifier of a
physical layer data pipe carrying link layer (or low layer)
signaling that may be used in the L2 layer. A transport session
descriptors field may include transport session level descriptors.
Each descriptor may be extended and include a num_descriptors
field. Each descriptor may include as many descriptor loops as the
number indicated by the num_descriptors field. The transport
session descriptors field may include transport session level
descriptors. A service descriptors field may include service level
descriptors. A partition descriptors field may include a partition
level descriptor, and one partition may indicate part of broadcast
streams used by a single broadcaster. An FIC session descriptors
field may include FIC level descriptors. According to an
embodiment, the fields included in the FIC may be included in a
table other than the FIC and transmitted along with a broadcast
signal.
[0980] FIG. 78 shows signaling data transmitted by the future
broadcast system according to another embodiment of the present
invention for fast broadcast service scan. FIC information (service
acquisition information) for supporting fast broadcast service scan
and service/component acquisition may include information about an
application layer transport session delivering service and
component data. The service acquisition information may further
include information about link layer signaling. As illustrated, the
service acquisition information may be represented in a binary
format. However, the FIC information may be represented in other
formats such as XML according to embodiments.
[0981] The service acquisition information may include the
following fields. An FIC_portocol_version field may indicate the
version of the structure of signaling information. A TSID field may
indicate the identifier of overall broadcast stream. A
num_partitions field may indicate the number of partitions of a
broadcast stream. It is assumed that each broadcast stream may be
divided into one or more partitions and transmitted in order to use
the num_partitions field. Each partition may include a plurality of
DPs corresponding to a single broadcaster. Each partition may
indicate a part of a broadcast steam, used by a single broadcaster.
A partition_id field may indicate the identifier of the
corresponding partition. A partition_protocol_version field may
indicate the version of the aforementioned partition structure. A
num_services field may indicate the number of one or more services
included in the corresponding partition. Each service may include a
plurality of signaling tables. For example, each service may
include DASH MPD including components and information about
segments thereof, a CMT including identifiers of components
included in broadband and other broadcast streams, an application
signaling table (AST) and a URL signaling table (UST) including at
least one of the URLs of the MPD, CMT and AST. These signaling
tables may be included in a signaling channel of the corresponding
service. A service_id field may indicate a service identifier. A
service_data_version field may indicate a change of service loop
data in the FIC or a change of service signaling data associated
with the corresponding service. A service_data_version field may be
increased by 1 whenever included service data is changed. For
example, service_data_version field may be increased by 1 when the
FIC, MPD, CMT, AST or UST is changed. The receiver may detect a
service loop data change of the FIC or a change of signaling
associated with the corresponding service using the
service_data_version field. A service_channel_number field may
indicate the channel number associated with the corresponding
service. A service_category field may indicate the category of the
corresponding service. For example, the service_category field may
indicate A/V, audio, ESG, CoD, etc. A service_short_name length
field may indicate the length of the name of the corresponding
service. A service_short_name field may indicate the name of the
corresponding service. A service_status field may indicate the
status of the corresponding service and represent an active or
suspended attribute and a hidden or shown attribute according to
the value thereof. A service_distribution field may have an
attribute similar to "multi-ensemble" flag of ATSC M/H. For
example, the service_distribution field may indicate information
about whether the corresponding service is included in the
corresponding partition, the service is presentable only with the
corresponding partition although the service is partially included
in the partition, another partition is necessary for presentation,
or other broadcast streams are necessary for presentation. An
sp_indicator field is a service protection flag and may indicate
whether one or more components necessary for presentation are
protected. An IP_version_flag field may indicate the following IP
address format. The IP_version_flag field may indicate that IPv4 is
used when the value thereof is 0 and indicate that IPv6 is used
when the value thereof is 1. A num_ROUTE_sessions field may
indicate the number of transport sessions delivering component data
of the corresponding service in a broadcast stream. For example,
transport session may be ROUTE sessions. The following information
may be set per ROUTE session. A source_IP_addr field may indicate
the source IP address of an IP datagram including the component
data of the corresponding service. A dest_IP_addr field may
indicate the destination IP address of the IP datagram including
the component data of the corresponding service. A dest_UDP_port
field may indicate the UDP port number of the IP datagram including
the component data of the corresponding service. An LSID_DP field
may indicate the identifier of a data pipe of a physical layer,
which delivers signaling including detailed information about a
transport session. In the case of ROUTE, for example, the signaling
including the detailed information about the transport session may
be LCT session instance description including information about an
LCT transport session of a ROUTE session. An LSID_tsi field may
indicate the identifier of a transport session through which
transport session instance description that is signaling including
detailed information about transport sessions is transmitted. Here,
the transport session instance description may be LSID in the case
of an LCT transmission session. In addition, signaling associated
with the corresponding service may be delivered through the
transport session in which the transport session instance
description is transmitted. A component_signaling_flag field may
indicate whether service signaling of the corresponding service is
transmitted through the corresponding transport session. When the
component_signaling_flag is 1, this may indicate that data
transmitted through the corresponding transport session includes
service signaling (e.g. MPD (DASH Media Presentation Description),
CMT or the like). Here, the CMT is a component mapping table and
may include identifiers of components delivered through broadband
and may also include information about components included in other
broadcast streams. Each service may include service signaling
channels. The service signaling channels may include an MPD, a CMT,
an AST and/or a UST. A service signaling channel may be a signaling
channel from among a plurality of route sessions for services, and
presence or absence thereof may be indicated through the component
signaling flag. When signaling and service components are
transmitted through a plurality of transport sessions (ROUTE or
MMTP sessions), the aforementioned service signaling tables may be
preferably delivered by a single transport session. A
link_layer_signaling_flag field may indicate whether the service
acquisition information carries link layer (or low layer)
signaling. A link_layer_signaling_data_version field may indicate a
change of associated link layer (or low layer) signaling data. This
field may be increased by 1 whenever the link_layer_signaling_data
is changed. The receiver may detect a variation in link layer (or
low layer) signaling using the link_layer_signaling_data_version
field. A link_layer_signaling_DP field may indicate the identifier
of a physical layer data pipe carrying link layer (or low layer)
signaling that may be used in the L2 layer.
[0982] A ROUTE session descriptors field may include transport
session level descriptors. Each descriptor may be extended and
include a num_descriptors field. Each descriptor may include as
many descriptor loops as a number corresponding to a value
indicated by the num_descriptors field. A transport session
descriptors field may include transport session level descriptors.
A service descriptors field may include service level descriptors.
A partition descriptors field may include a partition level
descriptor, and one partition may indicate part of broadcast
streams used by a single broadcaster. An FIC session descriptors
field may include FIC level descriptors.
[0983] According to an embodiment, the fields included in the
service acquisition information may be included in a table other
than the service acquisition information and transmitted along with
a broadcast signal.
[0984] FIG. 79 illustrates a method for acquiring service layer
signaling in the future broadcast system according to an embodiment
of the present invention. The upper part of the figure shows a
service layer signaling format used in the future broadcast system
according to the present invention. Service layer signaling may be
encapsulated in the illustrated format. For example, encapsulated
service layer signaling may include a Generic packet header (GPH),
an IP packet header (IPH), a UDP datagram header (UDPH), an
application transport protocol (e.g. ROUTE or MMTP) header (ATPH),
a signaling message header (SMH) and a signaling message. When the
future broadcast system uses the aforementioned service signaling,
the future broadcast system may deliver the service signaling as
shown in the lower part of the figure. A broadcast signal of the
future broadcast system may be transmitted through physical layer
frames. Broadcast signal frames may include physical layer
signaling. Physical layer signaling information may include a field
with respect to fast service acquisition information. This field
may include version information of the fast service acquisition
information. In other words, the field may indicate whether a
physical layer frame includes the fast service acquisition
information or whether the fast service acquisition information
needs to be parsed. The receiver may acquire the fast service
acquisition information using the field of physical layer
signaling. A broadcast signal of the future broadcast system may
include the fast service acquisition information in a physical
layer frame. The fast service acquisition information may include a
service identifier and information about a data pipe or a PLP
through which at least one of service layer signaling information
and a transport session instance descriptor is delivered. That is,
the receiver may identify the PLP through which at least one of the
service layer signaling information and transport session instance
descriptor is delivered using data pipe or PLP identifier
information included in the fast service acquisition information
and acquire the service layer signaling information or transport
session instance descriptor included therein. As illustrated, the
service layer signaling information or the transport session
instance descriptor may be delivered by a 0-th transport session in
the corresponding PLP. That is, the service layer signaling
information may be delivered by the transport session corresponding
to tsi=0 in the PLP indicated by the PLP identifier included in the
service acquisition information. In other words, the identifier of
the transport session through which service layer signaling is
delivered may be fixed to 0.
[0985] As illustrated, the service layer signaling may be
encapsulated as described above. That is, the service layer
signaling format may include a generic packet header (GPH), an IP
packet header (IPH), a UDP datagram header (UDPH), an application
transport protocol (e.g. ROUTE or MMTP) header (ATPH), a signaling
message header (SMUT) and a signaling message. Here, the signaling
message may include MPD delivery description, component mapping
description or URL signaling description according to type of a
message delivered by the service layer signaling.
[0986] In addition, the transport session instance descriptor may
have the aforementioned encapsulation format, as illustrated. That
is, the transport session instance descriptor may include a generic
packet header (GPH), an IP packet header (IPH), a UDP datagram
header (UDPH), an application transport protocol (e.g. ROUTE or
MMTP) header (ATPH), a signaling message header (SMH) and a
signaling message. Here, the signaling message may include the
transport session instance descriptor. In the present invention,
the transport session instance descriptor may be delivered in
service layer signaling.
[0987] FIG. 80 illustrates a method for acquiring service layer
signaling and link layer signaling in the future broadcast system
according to an embodiment of the present invention. When the
future broadcast system uses the aforementioned service layer
signaling, the future broadcast system may deliver the service
layer signaling as shown in the figure. A broadcast signal of the
future broadcast system may be transmitted through physical layer
frames. Broadcast signal frames may include physical layer
signaling. Physical layer signaling information may include a field
with respect to fast service acquisition information. This field
may include version information of the fast service acquisition
information. In other words, the field may indicate whether a
physical layer frame includes the fast service acquisition
information or whether the fast service acquisition information
needs to be parsed. The receiver may acquire the fast service
acquisition information using the field of physical layer
signaling. A broadcast signal of the future broadcast system may
include the fast service acquisition information in a physical
layer frame. The fast service acquisition information may include a
service identifier and information about a data pipe or a PLP
through which at least one of service layer signaling information
and a transport session instance descriptor is delivered. That is,
the receiver may identify the PLP through which at least one of the
service layer signaling information and transport session instance
descriptor is delivered using data pipe or PLP identifier
information included in the fast service acquisition information
and acquire the service layer signaling information or transport
session instance descriptor included therein. As illustrated, the
service layer signaling information or the transport session
instance descriptor may be delivered by a 0-th transport session in
the corresponding PLP. That is, the service layer signaling
information may be delivered by the transport session corresponding
to tsi=0 in the PLP indicated by the PLP identifier included in the
service acquisition information. In other words, the identifier of
the transport session through which service layer signaling is
delivered may be fixed to 0.
[0988] As illustrated, the service layer signaling may be
encapsulated as described above. That is, the service layer
signaling format may include a generic packet header (GPH), an IP
packet header (IPH), a UDP datagram header (UDPH), an application
transport protocol (e.g. ROUTE or MMTP) header (ATPH), a signaling
message header (SMUT) and a signaling message. Here, the signaling
message may include MPD delivery description, component mapping
description or URL signaling description according to type of a
message delivered by the service layer signaling.
[0989] In addition, the transport session instance descriptor may
have the aforementioned encapsulation format, as illustrated. That
is, the transport session instance descriptor may include a generic
packet header (GPH), an IP packet header (IPH), a UDP datagram
header (UDPH), an application transport protocol (e.g. ROUTE or
MMTP) header (ATPH), a signaling message header (SMH) and a
signaling message. Here, the signaling message may include the
transport session instance descriptor. In the present invention,
the transport session instance descriptor may be delivered in
service layer signaling.
[0990] In addition, the fast service acquisition information may
include information about a data pipe or a PLP through which link
layer signaling is delivered. That is, the receiver may identify
the PLP through which the link layer signaling is delivered using
data pipe or PLP identifier information included in the fast
service acquisition information and acquire the link layer
signaling included therein. As illustrated, a transport link layer
signaling format may include a Generic packet header (GPH) and a
signaling message. The signaling message may include information
about link layer signaling. The receiver may acquire link layer
signaling (or low layer signaling) through a data pipe and obtain
service/component signaling such as a component mapping table
through the application transport protocol.
[0991] FIG. 81 illustrates a method for acquiring service layer
signaling in the future broadcast system according to an embodiment
of the present invention. When the future broadcast system uses
3GPP eMBMS signaling for service/component signaling, the future
broadcast system may deliver the signaling as shown in the figure.
Here, service layer signaling may include User Service Bundle
Description (USBD), MPD, Session Description Protocol and may
further include transport session instance description. A broadcast
signal of the future broadcast system may be transmitted through
physical layer frames. Broadcast signal frames may include physical
layer signaling. Physical layer signaling information may include a
field with respect to fast service acquisition information. This
field may include version information of the fast service
acquisition information. In other words, the field may indicate
whether a physical layer frame includes the fast service
acquisition information or whether the fast service acquisition
information needs to be parsed. The receiver may acquire the fast
service acquisition information using the field of physical layer
signaling. A broadcast signal of the future broadcast system may
include the fast service acquisition information in a physical
layer frame. The fast service acquisition information may include a
service identifier and information about a data pipe or a PLP
through which at least one of service layer signaling information
and a transport session instance descriptor is delivered. That is,
the receiver may identify the PLP through which at least one of the
service layer signaling information and transport session instance
descriptor is delivered using data pipe or PLP identifier
information included in the fast service acquisition information
and acquire the service layer signaling information or transport
session instance descriptor included therein. As illustrated, the
service layer signaling information or the transport session
instance descriptor may be delivered by a 0-th transport session in
the corresponding PLP. That is, the service layer signaling
information may be delivered by the transport session corresponding
to tsi=0 in the PLP indicated by the PLP identifier included in the
service acquisition information. In other words, the identifier of
the transport session through which service layer signaling is
delivered may be fixed to 0.
[0992] As illustrated, the service layer signaling may be
encapsulated as described above. That is, the service layer
signaling format may include a generic packet header (GPH), an IP
packet header (IPH), a UDP datagram header (UDPH), an application
transport protocol (e.g. ROUTE or MMTP) header (ATPH), a signaling
message header (SMUT) and a signaling message. Here, the signaling
message may include user service bundle description (USBD), MPD and
Session Description Protocol according to type of a message
delivered by the service layer signaling.
[0993] In addition, the transport session instance descriptor may
have the aforementioned encapsulation format, as illustrated. That
is, the transport session instance descriptor may include a generic
packet header (GPH), an IP packet header (IPH), a UDP datagram
header (UDPH), an application transport protocol (e.g. ROUTE or
MMTP) header (ATPH), a signaling message header (SMH) and a
signaling message. Here, the signaling message may include the
transport session instance descriptor. In the present invention,
the transport session instance descriptor may be delivered in
service layer signaling.
[0994] FIG. 82 illustrates a method for acquiring service layer
signaling and link layer signaling in the future broadcast system
according to an embodiment of the present invention. When the
future broadcast system uses 3GPP eMBMS signaling, the future
broadcast system may deliver the signaling as shown in the figure.
A broadcast signal of the future broadcast system may be
transmitted through physical layer frames. Broadcast signal frames
may include physical layer signaling. Physical layer signaling
information may include a field with respect to fast service
acquisition information. This field may include version information
of the fast service acquisition information. In other words, the
field may indicate whether a physical layer frame includes the fast
service acquisition information or whether the fast service
acquisition information needs to be parsed. The receiver may
acquire the fast service acquisition information using the
corresponding field of physical layer signaling. A broadcast signal
of the future broadcast system may include the fast service
acquisition information in a physical layer frame. The fast service
acquisition information may include a service identifier and
information about a data pipe or a PLP through which at least one
of service layer signaling information and a transport session
instance descriptor is delivered. That is, the receiver may
identify the PLP through which at least one of the service layer
signaling information and transport session instance descriptor is
delivered using data pipe or PLP identifier information included in
the fast service acquisition information and acquire the service
layer signaling information or transport session instance
descriptor included therein. As illustrated, the service layer
signaling information or the transport session instance descriptor
may be delivered by a 0-th transport session in the corresponding
PLP. That is, the service layer signaling information may be
delivered by the transport session corresponding to tsi=0 in the
PLP indicated by the PLP identifier included in the service
acquisition information. In other words, the identifier of the
transport session through which service layer signaling is
delivered may be fixed to 0.
[0995] As illustrated, the service layer signaling may be
encapsulated as described above. That is, the service layer
signaling format may include a generic packet header (GPH), an IP
packet header (IPH), a UDP datagram header (UDPH), an application
transport protocol (e.g. ROUTE or MMTP) header (ATPH), a signaling
message header (SMUT) and a signaling message. Here, the signaling
message may include User Service Bundle Descirption (USBD), MPD and
Session Descirption Protocol according to type of a message
delivered by the service layer signaling.
[0996] In addition, the transport session instance descriptor may
have the aforementioned encapsulation format, as illustrated. That
is, the transport session instance descriptor may include a generic
packet header (GPH), an IP packet header (IPH), a UDP datagram
header (UDPH), an application transport protocol (e.g. ROUTE or
MMTP) header (ATPH), a signaling message header (SMH) and a
signaling message. Here, the signaling message may include the
transport session instance descriptor. In the present invention,
the transport session instance descriptor may be delivered in
service layer signaling.
[0997] In addition, the fast service acquisition information may
include information about a data pipe or a PLP through which link
layer signaling is delivered. That is, the receiver may identify
the PLP through which the link layer signaling is delivered using
data pipe or PLP identifier information included in the fast
service acquisition information and acquire the link layer
signaling included therein. As illustrated, a transport link layer
signaling format may include a generic packet header (GPH) and a
signaling message. The signaling message may include information
about link layer signaling. The receiver may acquire link layer
signaling (or low layer signaling) through a data pipe and obtain
service/component signaling such as a component mapping table
through the application transport protocol. That is, the future
broadcast system may include, in physical layer frames, signaling
information about a data pipe or a PLP including link layer
signaling.
[0998] FIG. 83 illustrates a method of delivering service layer
signaling in the future broadcast system according to an embodiment
of the present invention. The upper part of the figure shows a
service layer signaling format used in the future broadcast system
of the present invention. Service layer signaling may be
encapsulated in the illustrated format. For example, encapsulated
service layer signaling may be composed of a combination of a
generic packet header (GPH), an IP packet header (IPH), a UDP
datagram header (UDPH), an application transport protocol (e.g.
ROUTE or MMTP) header (ATPH) and a signaling message, as shown in
the left upper part of the figure. Alternatively, encapsulated
service layer signaling may be composed of a combination of a
generic packet header (GPH), an IP packet header (IPH), a UDP
datagram header (UDPH), an application transport protocol (e.g.
ROUTE or MMTP) header (ATPH), a signaling message header (SMH) and
a signaling message, as shown in the right upper part of the
figure. The ATPH may include a filtering index with respect to the
service layer signaling. Here, the filtering index may include a
signaling id, a version, etc. The signaling id may include
identifier information about service layer signaling and the
version may indicate the version of information included in the
service layer signaling.
[0999] When the future broadcast system uses the aforementioned
service signaling, the future broadcast system may deliver the
service signaling as shown in the lower part of the figure. A
broadcast signal of the future broadcast system may be transmitted
through physical layer frames. Broadcast signal frames may include
physical layer signaling. Physical layer signaling information may
include a field with respect to fast service acquisition
information. This field may include version information of the fast
service acquisition information. In other words, the field may
indicate whether a physical layer frame includes the fast service
acquisition information or whether the fast service acquisition
information needs to be parsed. The receiver may acquire the fast
service acquisition information using the corresponding field of
physical layer signaling. A broadcast signal of the future
broadcast system may include the fast service acquisition
information in a physical layer frame. The fast service acquisition
information may include a service identifier and information about
a data pipe or a PLP through which at least one of service layer
signaling information and a transport session instance descriptor
is delivered. That is, the receiver may identify the PLP through
which at least one of the service layer signaling information and
transport session instance descriptor is delivered using data pipe
or PLP identifier information included in the fast service
acquisition information and acquire the service layer signaling
information or transport session instance descriptor included
therein. As illustrated, the service layer signaling information or
the transport session instance descriptor may be delivered by a
0-th transport session in the corresponding PLP. That is, the
service layer signaling information may be delivered by the
transport session corresponding to tsi=0 in the PLP indicated by
the PLP identifier included in the service acquisition information.
In other words, the identifier of the transport session through
which service layer signaling is delivered may be fixed to 0.
[1000] As illustrated, the service layer signaling may be
encapsulated as described above. That is, the service layer
signaling format may include a generic packet header (GPH), an IP
packet header (IPH), a UDP datagram header (UDPH), an application
transport protocol (e.g. ROUTE or MMTP) header (ATPH), a signaling
message header (SMH) and a signaling message. Here, the signaling
message may include MPD delivery description, component mapping
description or URL signaling description according to type of a
message delivered by the service layer signaling. As described
above, the ATPH may include the filtering index with respect to the
service layer signaling. Here, the filtering index may include a
signaling id, a version, etc. The signaling id may include
identifier information about service layer signaling and the
version may indicate the version of information included in the
service layer signaling. For example, service layer signaling
including MPD delivery description may have a value of 0xF1 as the
signaling id thereof and a value of 0x01 as the version information
thereof. The version information may be changed when the contents
of the MPD delivery description corresponding to the signaling
message of the corresponding service layer signaling is changed.
Service layer signaling including component mapping description may
have a value of 0xF2 as the signaling id thereof and a value of
0x01 as the version information thereof. The version information
may be changed when the contents of the component mapping
description corresponding to the signaling message of the
corresponding service layer signaling is changed. Service layer
signaling including URL signaling description may have a value of
0xF3 as the signaling id thereof and a value of 0x01 as the version
information thereof. The version information may be changed when
the contents of the URL signaling description corresponding to the
signaling message of the corresponding service layer signaling are
changed. Accordingly, the receiver may filter desired service layer
signaling using signaling id and version information corresponding
to filtering information included in the application transport
protocol header of the service layer signaling. For example, when
the receiver intends to receive the MPD delivery description, the
receiver may receive the service layer signaling having a signaling
id of 0xF1. In addition, the receiver may check the version
information and, only when the MPD delivery description has been
updated from the previously received MPD delivery description,
parse the corresponding service layer signaling. Accordingly, the
receiver may reduce unnecessary parsing operation with respect to
service layer signaling and decrease processing overhead. As
described above, the future broadcast system may support the
receiver such that the receiver may filter desired information by
including, in the transport protocol header of service layer
signaling, signaling ID and version information.
[1001] FIG. 84 illustrates a method of transmitting service layer
signaling and link layer signaling in the future broadcast system
according to an embodiment of the present invention. Service layer
signaling used in the future broadcast system of the present
invention may be encapsulated. For example, encapsulated service
layer signaling may be composed of a combination of a generic
packet header (GPH), an IP packet header (IPH), a UDP datagram
header (UDPH), an application transport protocol (e.g. ROUTE or
MMTP) header (ATPH) and a signaling message. Otherwise,
encapsulated service layer signaling may be composed of a
combination of a generic packet header (GPH), an IP packet header
(IPH), a UDP datagram header (UDPH), an application transport
protocol (e.g. ROUTE or MMTP) header (ATPH), a signaling message
header (SMH) and a signaling message. The ATPH may include a
filtering index with respect to the service layer signaling. Here,
the filtering index may include a signaling id and a version. The
signaling id is identifier information about the service layer
signaling and the version indicates the version of information
included in the service layer signaling.
[1002] When the future broadcast system uses the aforementioned
service signaling, the future broadcast system may deliver the
service signaling as illustrated in the figure. A broadcast signal
of the future broadcast system may be transmitted through physical
layer frames. Broadcast signal frames may include physical layer
signaling. Physical layer signaling information may include a field
with respect to fast service acquisition information. This field
may include version information of the fast service acquisition
information. In other words, the field may indicate whether a
physical layer frame includes the fast service acquisition
information or whether the fast service acquisition information
needs to be parsed. The receiver may acquire the fast service
acquisition information using the field of physical layer
signaling. A broadcast signal of the future broadcast system may
include the fast service acquisition information in a physical
layer frame. The fast service acquisition information may include a
service identifier and information about a data pipe or a PLP
through which at least one of service layer signaling information
and a transport session instance descriptor is delivered. That is,
the receiver may identify the PLP through which at least one of the
service layer signaling information and transport session instance
descriptor is delivered using data pipe or PLP identifier
information included in the fast service acquisition information
and acquire the service layer signaling information or transport
session instance descriptor included therein. As illustrated, the
service layer signaling information or the transport session
instance descriptor may be delivered by a 0-th transport session in
the corresponding PLP. That is, the service layer signaling
information may be delivered by the transport session corresponding
to tsi=0 in the PLP indicated by the PLP identifier included in the
service acquisition information. In other words, the identifier of
the transport session through which service layer signaling is
delivered may be fixed to 0.
[1003] As illustrated, the service layer signaling may be
encapsulated as described above. That is, the service layer
signaling format may include a generic packet header (GPH), an IP
packet header (IPH), a UDP datagram header (UDPH), an application
transport protocol (e.g. ROUTE or MMTP) header (ATPH), a signaling
message header (SMH) and a signaling message. Here, the signaling
message may include MPD delivery description, component mapping
description or URL signaling description according to type of a
message delivered by the service layer signaling. As described
above, the ATPH may include the filtering index with respect to the
service layer signaling. Here, the filtering index may include a
signaling id, a version, etc. The signaling id may include
identifier information about service layer signaling and the
version may indicate the version of information included in the
service layer signaling. For example, service layer signaling
including MPD delivery description may have a value of 0xF1 as the
signaling id thereof and a value of 0x01 as the version information
thereof. The version information may be changed when the contents
of the MPD delivery description corresponding to the signaling
message of the corresponding service layer signaling are changed.
Service layer signaling including component mapping description may
have a value of 0xF2 as the signaling id thereof and a value of
0x01 as the version information thereof. The version information
may be changed when the contents of the component mapping
description corresponding to the signaling message of the
corresponding service layer signaling are changed. Service layer
signaling including URL signaling description may have a value of
0xF3 as the signaling id thereof and has a value of 0x01 as the
version information thereof. The version information may be changed
when the contents of the URL signaling description corresponding to
the signaling message of the corresponding service layer signaling
is changed. Accordingly, the receiver may filter desired service
layer signaling using signaling id and version information
corresponding to filtering information included in the application
transport protocol header of the service layer signaling. For
example, when the receiver intends to receive the MPD delivery
description, the receiver may receive the service layer signaling
having a signaling id of 0xF1. In addition, the receiver may check
the version information and, only when the MPD delivery description
has been updated from the previously received MPD delivery
description, parse the corresponding service layer signaling.
Accordingly, the receiver may reduce unnecessary parsing operation
with respect to service layer signaling and decrease processing
overhead. As described above, the future broadcast system may
support the receiver such that the receiver may filter desired
information by including, in the transport protocol header of
service layer signaling, signaling ID and version information.
[1004] In addition, the fast service acquisition information may
include information about a data pipe or a PLP through which link
layer signaling is delivered. That is, the receiver may identify
the PLP through which the link layer signaling is delivered using
data pipe or PLP identifier information included in the fast
service acquisition information and acquire the link layer
signaling included therein. As illustrated, a transport link layer
signaling format may include a generic packet header (GPH) and a
signaling message. The signaling message may include information
about link layer signaling. The receiver may acquire link layer
signaling (or low layer signaling) through a data pipe and obtain
service/component signaling such as a component mapping table
through the application transport protocol. That is, the future
broadcast system may include, in physical layer frames, signaling
information about a data pipe or a PLP including link layer
signaling.
[1005] FIG. 85 illustrates a method of delivering service layer
signaling in the future broadcast system according to an embodiment
of the present invention. Service layer signaling used in the
future broadcast system of the present invention may be
encapsulated. For example, encapsulated service layer signaling may
be composed of a combination of a generic packet header (GPH), an
IP packet header (IPH), a UDP datagram header (UDPH), an
application transport protocol (e.g. ROUTE or MMTP) header (ATPH)
and a signaling message. Otherwise, encapsulated service layer
signaling may be composed of a combination of a generic packet
header (GPH), an IP packet header (IPH), a UDP datagram header
(UDPH), an application transport protocol (e.g. ROUTE or MMTP)
header (ATPH), a signaling message header (SMH) and a signaling
message. The ATPH may include a filtering index with respect to the
service layer signaling. Here, the filtering index may include a
signaling id and a version. The signaling id is identifier
information about the service layer signaling and the version
indicates the version of information included in the service layer
signaling.
[1006] When the future broadcast system uses 3GPP eMBMS signaling,
the signaling may be delivered as illustrated. When the future
broadcast system uses the aforementioned service signaling, the
service signaling may be delivered as shown in the lower part of
the figure. A broadcast signal of the future broadcast system may
be transmitted through physical layer frames. Broadcast signal
frames may include physical layer signaling. Physical layer
signaling information may include a field with respect to fast
service acquisition information. This field may include version
information of the fast service acquisition information. In other
words, the field may indicate whether a physical layer frame
includes the fast service acquisition information or whether the
fast service acquisition information needs to be parsed. The
receiver may acquire the fast service acquisition information using
the field of physical layer signaling. A broadcast signal of the
future broadcast system may include the fast service acquisition
information in a physical layer frame. The fast service acquisition
information may include a service identifier and information about
a data pipe or a PLP through which at least one of service layer
signaling information and a transport session instance descriptor
is delivered. That is, the receiver may identify the PLP through
which at least one of the service layer signaling information and
transport session instance descriptor is delivered using data pipe
or PLP identifier information included in the fast service
acquisition information and acquire the service layer signaling
information or transport session instance descriptor included
therein. As illustrated, the service layer signaling information or
the transport session instance descriptor may be delivered by a
0-th transport session in the corresponding PLP. That is, the
service layer signaling information may be delivered by the
transport session corresponding to tsi=0 in the PLP indicated by
the PLP identifier included in the service acquisition information.
In other words, the identifier of the transport session through
which service layer signaling is delivered may be fixed to 0.
[1007] As illustrated, the service layer signaling may be
encapsulated as described above. That is, the service layer
signaling format may include a generic packet header (GPH), an IP
packet header (IPH), a UDP datagram header (UDPH), an application
transport protocol (e.g. ROUTE or MMTP) header (ATPH), a signaling
message header (SMH) and a signaling message. Here, the signaling
message may include User Service Bundle Description (USBD), MPD and
Session Description Protocol according to type of a message
delivered by the service layer signaling. As described above, the
ATPH may include the filtering index with respect to the service
layer signaling. Here, the filtering index may include a signaling
id, a version, etc. The signaling id may include identifier
information about service layer signaling and the version may
indicate the version of information included in the service layer
signaling. For example, service layer signaling including the User
Service Bundle Description may have a value of 0xF4 as the
signaling id thereof and a value of 0x01 as the version information
thereof. The version information may be changed when the contents
of the User Service Bundle Description corresponding to the
signaling message of the corresponding service layer signaling are
changed. Service layer signaling including the Session Description
Protocol may have a value of 0xF5 as the signaling id thereof and a
value of 0x01 as the version information thereof. The version
information may be changed when the contents of the Session
Description Protocol corresponding to the signaling message of the
corresponding service layer signaling are changed. Service layer
signaling including the MPD may have a value of 0xF6 as the
signaling id thereof and a value of 0x02 as the version information
thereof. The version information may be changed when the contents
of the MPD corresponding to the signaling message of the
corresponding service layer signaling are changed. Accordingly, the
receiver may filter desired service layer signaling using signaling
id and version information corresponding to filtering information
included in the application transport protocol header of the
service layer signaling. For example, when the receiver intends to
receive the User Service Bundle Description, the receiver may
receive the service layer signaling having a signaling id of 0xF4.
In addition, the receiver may check the version information and,
only when the User Service Bundle Description has been updated from
the previously received User Service Bundle Description, parse the
corresponding service layer signaling. Accordingly, the receiver
may reduce unnecessary parsing operation with respect to service
layer signaling and decrease processing overhead. As described
above, the future broadcast system may support the receiver such
that the receiver may filter desired information by including, in
the transport protocol header of service layer signaling, signaling
ID and version information.
[1008] FIG. 86 illustrates a method of transmitting service layer
signaling and link layer signaling in the future broadcast system
according to an embodiment of the present invention. Service layer
signaling used in the future broadcast system of the present
invention may be encapsulated. For example, encapsulated service
layer signaling may be composed of a combination of a generic
packet header (GPH), an IP packet header (IPH), a UDP datagram
header (UDPH), an application transport protocol (e.g. ROUTE or
MMTP) header (ATPH) and a signaling message. Otherwise,
encapsulated service layer signaling may be composed of a
combination of a generic packet header (GPH), an IP packet header
(IPH), a UDP datagram header (UDPH), an application transport
protocol (e.g. ROUTE or MMTP) header (ATPH), a signaling message
header (SMH) and a signaling message. The ATPH may include a
filtering index with respect to the service layer signaling. Here,
the filtering index may include a signaling id and a version. The
signaling id is identifier information about the service layer
signaling and the version indicates the version of information
included in the service layer signaling.
[1009] When the future broadcast system uses 3GPP eMBMS signaling,
the signaling may be delivered as illustrated in the figure. A
broadcast signal of the future broadcast system may be transmitted
through physical layer frames. Broadcast signal frames may include
physical layer signaling. Physical layer signaling information may
include a field with respect to fast service acquisition
information. This field may include version information of the fast
service acquisition information. In other words, the field may
indicate whether a physical layer frame includes the fast service
acquisition information or whether the fast service acquisition
information needs to be parsed. The receiver may acquire the fast
service acquisition information using the corresponding field of
physical layer signaling. A broadcast signal of the future
broadcast system may include the fast service acquisition
information in a physical layer frame. The fast service acquisition
information may include a service identifier and information about
a data pipe or a PLP through which at least one of service layer
signaling information and a transport session instance descriptor
is delivered. That is, the receiver may identify the PLP through
which at least one of the service layer signaling information and
transport session instance descriptor is delivered using data pipe
or PLP identifier information included in the fast service
acquisition information and acquire the service layer signaling
information or transport session instance descriptor included
therein. As illustrated, the service layer signaling information or
the transport session instance descriptor may be delivered by a
0-th transport session in the corresponding PLP. That is, the
service layer signaling information may be delivered by the
transport session corresponding to tsi=0 in the PLP indicated by
the PLP identifier included in the service acquisition information.
In other words, the identifier of the transport session through
which service layer signaling is delivered may be fixed to 0.
[1010] As illustrated, the service layer signaling may be
encapsulated as described above. That is, the service layer
signaling format may include a generic packet header (GPH), an IP
packet header (IPH), a UDP datagram header (UDPH), an application
transport protocol (e.g. ROUTE or MMTP) header (ATPH), a signaling
message header (SMH) and a signaling message. Here, the signaling
message may include User Service Bundle Description (USBD), MPD and
Session Description Protocol according to type of a message
delivered by the service layer signaling. As described above, the
ATPH may include the filtering index with respect to the service
layer signaling. Here, the filtering index may include a signaling
id, a version, etc. The signaling id may include identifier
information about service layer signaling and the version may
indicate the version of information included in the service layer
signaling. For example, service layer signaling including the User
Service Bundle Description may have a value of 0xF4 as the
signaling id thereof and a value of 0x01 as the version information
thereof. The version information may be changed when the contents
of the User Service Bundle Description corresponding to the
signaling message of the corresponding service layer signaling are
changed. Service layer signaling including the Session Description
Protocol may have a value of 0xF5 as the signaling id thereof and a
value of 0x01 as the version information thereof. The version
information may be changed when the contents of the Session
Description Protocol corresponding to the signaling message of the
corresponding service layer signaling are changed. Service layer
signaling including the MPD may have a value of 0xF6 as the
signaling id thereof and a value of 0x02 as the version information
thereof. The version information may be changed when the contents
of the MPD corresponding to the signaling message of the
corresponding service layer signaling are changed. Accordingly, the
receiver may filter desired service layer signaling using signaling
id and version information corresponding to filtering information
included in the application transport protocol header of the
service layer signaling. For example, when the receiver intends to
receive the User Service Bundle Description, the receiver may
receive the service layer signaling having a signaling id of 0xF4.
In addition, the receiver may check the version information and,
only when the User Service Bundle Description has been updated from
the previously received User Service Bundle Description, parse the
corresponding service layer signaling. Accordingly, the receiver
may reduce unnecessary parsing operation with respect to service
layer signaling and decrease processing overhead. As described
above, the future broadcast system may support the receiver such
that the receiver may filter desired information by including, in
the transport protocol header of service layer signaling, signaling
ID and version information.
[1011] In addition, the fast service acquisition information may
include information about a data pipe or a PLP through which link
layer signaling is delivered. That is, the receiver may identify
the PLP through which the link layer signaling is delivered using
data pipe or PLP identifier information included in the fast
service acquisition information and acquire the link layer
signaling included therein. As illustrated, a transport link layer
signaling format may include a generic packet header (GPH) and a
signaling message. The signaling message may include information
about link layer signaling. The receiver may acquire link layer
signaling (or low layer signaling) through a data pipe and obtain
service/component signaling such as a component mapping table
through the application transport protocol. That is, the future
broadcast system may include, in physical layer frames, signaling
information about a data pipe or a PLP including link layer
signaling.
[1012] FIG. 87 illustrates a method of transmitting service layer
signaling of the future broadcast system according to an embodiment
of the present invention. Service layer signaling may include the
aforementioned signaling or 3GPP eMBMS signaling. When a fast
information channel is not present in a broadcast signal of the
future broadcast system, signaling data for supporting fast service
scan and acquisition may be transmitted through a common data pipe,
a data pipe or a PLP in a physical frame as illustrated. In this
case, the signaling data associated with fast service scan and
acquisition may be encapsulated in the form of link (or low) layer
signaling and transmitted along with other link (or low) layer
signaling. That is, the PLP in the frame may carry the signaling
data including service acquisition information. Furthermore, the
signaling data may be transmitted through the same data pipe or PLP
as that used to transmit service/component signaling or component
data or a separate data pipe or PLP. As the service/component
signaling, the aforementioned signaling or 3GPP eMBMS signaling may
be transmitted. The corresponding signaling may include a generic
packet header (GPH), an IP packet header (IPH), a UDP datagram
header (UDPH), an application transport protocol (e.g. ROUTE or
MMTP) header (ATPH), a signaling message header (SMH) and a
signaling message, as described above. Here, the SMH may not be
included in the signaling format according to an embodiment. The
ATPH may include a filtering index with respect to service layer
signaling. Here, the filtering index may include a signaling id and
a version. The signaling id is identifier information about the
service layer signaling and the version indicates the version of
information included in the service layer signaling.
[1013] The lower part of the figure shows a method of acquiring
service layer signaling using service acquisition information
included in link layer signaling. A PLP of a broadcast signal frame
may include link layer signaling. The link layer signaling may
include the aforementioned fast service scan and acquisition
information. The fast service scan and acquisition information may
include a service identifier and PLP identifier information
including service layer signaling with respect to the corresponding
service. The PLP indicated by the corresponding PLP identifier may
include service layer signaling. The service layer signaling may
include a generic packet header (GPH), an IP packet header (IPH), a
UDP datagram header (UDPH), an application transport protocol (e.g.
ROUTE or MMTP) header (ATPH), a signaling message header (SMH) and
a signaling message. The signaling message of the service layer
signaling may include transport session instance description, MPD
delivery description, component mapping description or URL
signaling description. The future broadcast signal receiver may
acquire a desired service by parsing the service layer
signaling.
[1014] FIG. 88 illustrates a method of delivering service layer
signaling of the future broadcast system according to an embodiment
of the present invention. Service layer signaling may include the
aforementioned signaling or 3GPP eMBMS signaling. A PLP of a
broadcast signal frame may include link layer signaling. The link
layer signaling may include the aforementioned fast service scan
and acquisition information. The fast service scan and acquisition
information may include a service identifier and PLP identifier
information including service layer signaling with respect to the
corresponding service. The PLP indicated by the corresponding PLP
identifier may include service layer signaling. The service layer
may include a generic packet header (GPH), an IP packet header
(IPH), a UDP datagram header (UDPH), an application transport
protocol (e.g. ROUTE or MMTP) header (ATPH) and a signaling
message. The signaling message of the service layer signaling may
include transport session instance description, MPD delivery
description, component mapping description or URL signaling
description. The future broadcast signal receiver may acquire a
desired service by parsing the service layer signaling. Here, the
ATPH may include a filtering index with respect to service layer
signaling. Here, the filtering index may include a signaling id and
a version. The signaling id is identifier information about the
service layer signaling and the version indicates the version of
information included in the service layer signaling. The method for
filtering the service layer signaling using the filtering index has
been described above.
[1015] FIG. 89 illustrates a syntax of a header of a signaling
message according to another embodiment of the present
invention.
[1016] The signaling message according to another embodiment of the
present invention may be represented in XML. Here, signaling
information included in the signaling message in XML may correspond
to the signaling information as described above or below.
[1017] The header of the signaling message according to another
embodiment of the present invention may include signaling_id,
signaling_length, signaling_id_extension, version_number,
current_next_indicator, indicator_flags, fragmentation_indicator,
payload_format_indicator, expiration_indicator,
validfrom_indicator, fragment_number, last_fragment_number,
payload_format, validfrom and/or expiration information.
[1018] For description of signaling information having names
identical or similar to those of the signaling information included
in the aforementioned signaling message header, from among the
signaling information included in the signaling message header
according to the present embodiment, refer to the above
description.
[1019] The validfrom indicator information indicates whether the
signaling message header part includes a value of validfrom
information. For example, a validfrom indicator information value
of "1" may indicate that the signaling message header part includes
the validfrom information.
[1020] The validfrom information may indicate the time from which
the signaling message included in a payload is available. The
receiver may recognize the time from which the signaling message
included in the payload is available using the validfrom
information and use the data included in the payload as signaling
information from the corresponding time.
[1021] Here, the payload refers to a region in a broadcast signal
including data of broadcast services or broadcast content data
(broadcast service data). That is, signaling information is
generally transmitted through a region, which is physically or
logically separated from broadcast service data, in a broadcast
signal. According to the present invention, however, the signaling
information may be transmitted through a payload region in a
broadcast signal when the payload has a spare region or signaling
information, which exceeds a region allocated for signaling
information transmission, needs to be transmitted.
[1022] FIG. 90 illustrates a protocol stack for processing a DASH
initialization segment according to an embodiment of the present
invention.
[1023] The DASH initialization segment may be transmitted in the
same format as the aforementioned initialization segment delivery
table or in XML.
[1024] The DASH initialization segment includes metadata (signaling
information) necessary to represent media streams (broadcast
signals) encapsulated into a plurality of segments. Here, a segment
is a data unit associated with HTTP-URL. A segment includes data
for broadcast services or broadcast content. Representation is a
data unit including one or more media streams in a transport
format. The representation may include one or more segments.
[1025] The DASH initialization segment may be processed according
to the illustrated protocol stack in the transmitter or the
receiver. The DASH initialization segment may be transmitted
through one or more paths on the protocol stack.
[1026] In the protocol stack, signaling information or broadcast
service data may be processed according to protocols of multiple
layers. In the figure, "signaling channel and data pipes" may
correspond to the first layer, "FIC and link layer frames" may
correspond to the second layer, Internet protocol (IP) may
correspond to the third layer, a user datagram protocol (UDP) may
correspond to the fourth layer and ROUTE may correspond to the
fifth layer. A link layer frame may include a link layer packet
described in the specification.
[1027] In the protocol stack processing the DASH initialization
segment, when signaling data such as the initialization segment is
directly loaded in IP/IUDP and transmitted through the illustrated
path (1), the initialization segment may be transmitted as
information in the format of the aforementioned initialization
segment delivery table or the initialization segment itself may be
transmitted in the form of an IP datagram through processing of the
protocol stack. The aforementioned information for service
signaling and/or component signaling may also be transmitted
through the path (1).
[1028] According to an embodiment of the present invention, the
DASH initialization segment may be transmitted along with media
data through a specific session for transmitting signaling data,
such as a path (2), or through a session for transmitting component
data, such as a path (3). For example, the application transport
protocol may use real-time object delivery over unidirectional
transport (ROUTE). A ROUTE session may include a session for
transmitting signaling information and/or a session for
transmitting broadcast media data. The broadcast system fixes the
TSI of a session for transmitting signaling information to a
specific value such that the receiver may recognize that data
transmitted through the session corresponding to the TSI is
signaling information.
[1029] When the signaling information (data) such as the
initialization segment is transmitted through the illustrated path
(2) and/or path (3), information indicating locations of data in
the aforementioned signaling message format and the initialization
segment in a transport stream or a transport object and/or
information for identifying the data in the signaling message
format or the initialization segment from among data transmitted
along therewith may be provided in the form of fields in a
transport protocol packet or separate signaling information.
[1030] FIG. 91 shows part of layered coding transport (LCT) session
instance description (LSID) according to an embodiment of the
present invention.
[1031] The LCT session instance descriptor according to an
embodiment of the present invention may provide information
indicating locations of data in the aforementioned signaling
message format and the initialization segment in a broadcast signal
and/or information for identifying the data in the signaling
message format or the initialization segment from among data
transmitted along therewith.
[1032] The LCT session instance descriptor may include a
PayloadFormat element. The PayloadFormat element may include
@codePoint, @deliveryObjectFormat, @fragmentation, @deliveryOrder
and/or @sourceFecPayloadID information.
[1033] Each element may be used to provide information as
illustrated in the figure.
[1034] According to an embodiment of the present invention, a
broadcast receiver or a broadcast transmitter may use
@deliveryObjectFormat information (or field) of the PayloadFormat
element in the SourceFlow element of the LSID in order to identify
a ROUTE packet including the initialization segment.
[1035] In one embodiment, @deliveryObjectFormat information may
indicate that the corresponding ROUTE packet includes a signaling
message format when the value thereof is "0". When the
@deliveryObjectFormat information has a value of "0", the
@deliveryObjectFormat information may indicate that a ROUTE packet
having the same code point (CP) in an LCT packet header as the
value of @codePoint information allocated to the PayloadFormat
element carries data in the aforementioned signaling message
format. The initialization segment may be transmitted in the
signaling message format. Transmission of other signaling data such
as service signaling data and component signaling data in the
signaling message format through ROUTE packets using the same
method as the one above may be recognized through the
@deliveryObjectFormat information.
[1036] When the @deliveryObjectFormat information has a value of
"4", the @deliveryObjectFormat field may indicate that the
corresponding ROUTE packet includes metadata (signaling
information) containing the initialization segment. When the
@deliveryObjectFormat field has a value of "4", the
@deliveryObjectFormat information may indicate transmission of a
metadata format including the initialization segment through a
ROUTE packet or direct transmission of the initialization segment
through the ROUTE packet.
[1037] According to an embodiment of the present invention, the
broadcast system (broadcast receiver and/or broadcast transmitter)
may signal direct transmission of other signaling data such as
service signaling (service level signaling information) and/or
component signaling (component level signaling information) through
ROUTE packets by allocating a new value (e.g. a value equal to or
greater than "5") to the @deliveryObjectFormat information.
[1038] According to another embodiment of the present invention,
the broadcast system may identify a ROUTE packet carrying signaling
data such as the initialization segment through other fields or new
additional fields in the LSID in addition to the method of using
the @deliveryObjectFormat information described in the present
embodiment.
[1039] FIG. 92 shows signaling object description (SOD) providing
information for filtering a service signaling message according to
an embodiment of the present invention.
[1040] The signaling object description according to an embodiment
of the present invention may include @protocolVersion,
@dataVersion, @validFrom, @expiration, Signaling Object element,
@toi, @type, @version, @instance Id, @validFrom, @expiration and/or
@payloadFormat.
[1041] The @protocolVersion information indicates the version of
the signaling object description.
[1042] The @dataVersion information indicates the version of
instances of the signaling object description. The @dataVersion
information may be changed when the contents of the signaling
object description are varied.
[1043] The @validfrom information indicates the time from when the
instances of the signaling object description start are available.
The receiver may recognize the time from which the signaling object
description is available using the @validfrom information and use
information included in the signaling object description from the
corresponding time.
[1044] The @expiration information indicates the time at which
availability of the instance of the signaling object description
expires. The receiver may recognize the time at which availability
of the signaling object description expires and manage information
of the signaling object description using the @validfrom
information.
[1045] The Signaling Object element indicates an object including
signaling information. The signaling object description may include
signaling information about one or more signaling objects.
[1046] The @toi information indicates a transmission object
identifier (TOI) allocated to a signaling object. The @toi
information may be used to identify a packet associated with the
signaling object. The receiver may identify the following
information including the type and/or version of a signaling
message transmitted through each object by mapping the @toi
information to a TOI of an LCT packet.
[1047] The @type information identifies the type of a signaling
message included in an object. For example, the @type information
may indicate transmission of LSID (LCT Session Instance
Description) as a signaling message in the corresponding object
when the value thereof is 0, transmission of CMD (Component Mapping
Description) as a signaling message in the corresponding object
when the value thereof is 1, transmission of ASD (Application
Signaling Description) as a signaling message in the corresponding
object when the value thereof is 2, transmission of MPD (Media
Presentation Description) as a signaling message in the
corresponding object when the value thereof is 3, transmission of
USD (URL Signaling Description) as a signaling message in the
corresponding object when the value thereof is 4, and transmission
of the IS (Initialization Segment) as a signaling message in the
corresponding object when the value there of is 5.
[1048] The @version information indicates the version of a
signaling message. The receiver may recognize change of the
signaling message through variation of the value of this field.
[1049] The @instance Id information identifies an instance of a
signaling message. This information may be used for the receiver to
identify instances of signaling messages, which may be present in
one service, such as initialization segments.
[1050] The @validFrom information indicates the time from which a
signaling message included in an object is available. The receiver
may recognize the time from which the signaling message included in
the corresponding object is available using this information and
use the signaling message included in the object from the
corresponding time.
[1051] The @expiration information indicates the time for which the
signaling message included in the object is valid. The receiver may
recognize the time at which availability of the signaling message
included in the object expires and manage the signaling message
using this information.
[1052] The @payloadFormat information indicates the format of
signaling message data included in the corresponding object. For
example, a signaling message may be provided in a binary format or
XML and the @payloadFormat information indicates this format.
[1053] When signaling messages are transmitted with an LCT based
protocol such as ROUTE, each signaling message may be set as an
object and processed. Since an object may be identified by the
unique TOI thereof in the aforementioned protocol, signaling
messages may be filtered by mapping signaling message related
information such as version and type to each TOI. The
aforementioned SOD (Signaling Object Description) provides
filtering information of signaling objects corresponding to a
single transport session. The signaling object description may be
transmitted through internal or external means of a signaling
transport session. When the signaling object description is
transmitted through the internal means, the receiver may identify
the signaling object description with a unique TOI value (e.g. 0 or
0xFFFF) and interpret the signaling object description prior to
other signaling messages transmitted along therewith. When the
signaling object description is transmitted through the external
means, the signaling object description is transmitted through a
fast information channel (FIC), a service list table (SLT), a
separate IP datagram or a different ROUTE session prior to other
objects delivered in the corresponding session such that the
receiver may previously acquire information of the corresponding
signaling message.
[1054] FIG. 93 illustrates an object including a signaling message
according to an embodiment of the present invention.
[1055] When signaling messages are transmitted using an LCT based
protocol such as ROUTE, each signaling message may be set as an
object and processed. An object may be identified by the unique TOI
thereof in the aforementioned protocol. The receiver may filter
signaling messages by mapping signaling message related information
such as version and type to each TOI. Objects containing different
content may be assigned different TOIs. In this case, the broadcast
system may process signaling messages through a method compatible
with a conventional object processing method since all objects may
be uniquely identified.
[1056] The figure illustrates an embodiment in which part of a TOI
field is used for description of fixed-length signaling message
related information. In the present embodiment, a 32-bit TOI field
is used, and the type and version of signaling data transmitted
through the corresponding object may be identified through a 16-bit
type field and a 16-bit version field. In the same manner,
additional information of the aforementioned sequence number
information, validfrom information, expiration information and/or
payload format information may be delivered by allocating part of
the TOI field to fixed-length fields.
[1057] The object according to an embodiment of the present
invention may include V, C, PSI, S, O, H, A, B, HDR LEN, Codepoint,
Congestion Control Information, Transport Session Identifier (TSI),
Transport Object Identifier (TOI), Header Extensions, FEC payload
ID and/or Encoding Symbols elements. Here, an element may be
referred to as information or a field.
[1058] The PSI element may include an X element and/or a Y
element.
[1059] The TOI element may include a Type element and/or a Version
element.
[1060] The V element indicates the version number of a packet. The
V element may indicate the version of ALC/LCT. The V element may
indicate that packets conforming to ALC/LCT+ are transmitted
through the corresponding object.
[1061] The C element corresponds to a congestion control flag. The
C element indicates the length of a congestion control information
(CCI) element. For example, the C element may indicate a CCI length
of 32 bits when the value thereof is 0, a CCI length of 64 bits
when the value thereof is 1, a CCI length of 96 bits when the value
thereof is 2, and a CCI length of 128 bits when the value thereof
is 3.
[1062] The PSI element may correspond to protocol-specific
indication (PSI). The PSI element may be used as an indicator of a
specific purpose for an upper protocol of ALC/LCT+. The PSI element
may indicate whether the current packet corresponds to a source
packet or an FEC repair packet.
[1063] The X element may correspond to information indicating a
source packet. When different FEC payload ID formats are
respectively used for source data and repair data, the X element
indicates the FEC payload ID format for the source data when the
value thereof is "1" and indicates the FEC payload ID format for
the repair data when the value thereof is "0". When the X element
is set to "0" in the transmitter, the receiver may ignore this
element or packet and may not process the same.
[1064] The S element may correspond to a transport session
identifier flag. The S element indicates the length of the
transport session identifier element.
[1065] The O element may correspond to a transport object
identifier flag. The O element indicates the length of the
transport object identifier element. An object refers to one field
and the aforementioned TOI is identification information of each
object. A file corresponding to a TOI of 0 may include signaling
information associated therewith.
[1066] The H element may correspond to a half-word flag. The H
element indicates whether to add a half-word (16 bits) to the TSI
and TOI fields.
[1067] The A element may correspond to a close session flag. The A
element indicates that a session is closed or closure of the
session is imminent.
[1068] The B element may correspond to a close object flag. The B
element indicates that an object is closed or closure of the object
is imminent.
[1069] The HDR_LEN element indicates the length of a header of a
packet.
[1070] The Codepoint element indicates the type of a payload
transmitted by the packet. An additional payload header may be
inserted into a prefix of payload data according to payload
type.
[1071] The congestion control information (CCI) element may include
congestion control information such as layer numbers, logical
channel numbers and sequence numbers. The CCI element may include
necessary congestion control related information.
[1072] The transport session identifier (TSI) element is a unique
identifier of a session. The TSI element indicates one of all
sessions from a specific sender. The TSI element identifies a
transport session. The value of the TSI element may be used for one
track.
[1073] The transport object identifier (TOI) element is a unique
identifier of an object. The TOI element indicates an object to
which the corresponding packet belongs in a session. The value of
the TOI element may be used for one piece of ISO BMFF object data.
The TOI element may include the ID of an ISO BMFF file and the ID
of a chunk. The TOI element may have a combination of the ISO BMFF
file ID and the chunk ID as a value thereof.
[1074] The Type element identifies the type of data transmitted
through the corresponding object. For example, the Type element may
indicate that the data transmitted through the corresponding object
is a signaling message.
[1075] The Version element identifies the version of the data
transmitted through the corresponding object. For example, the
Version element may include information indicating whether the
structure and/or contents of the data identified through the Type
object have been changed.
[1076] The Header Extensions element may include additional header
information.
[1077] The FEC payload ID element is an FEC payload identifier. The
FEC payload ID element includes identification information of a
transmission block or an encoding symbol. The FEC Payload ID
indicates an identifier when the file has been FEC-encoded. For
example, when the FLUTE protocol file has been FEC encoded, the FEC
Payload ID may be allocated by a broadcaster or a broadcast server
to identify the same.
[1078] The Encoding Symbols element may include data of the
transmission block or encoding symbol.
[1079] FIG. 94 illustrates TOI configuration description (TCD)
according to an embodiment of the present invention.
[1080] As described above, part of the TOI field may be used for
description of variable-length signaling message related
information. For description of signaling message related
information in the variable-length TOI field, TOI field
configuration information may be separately transmitted. In an
embodiment, the TOI configuration description as shown in the table
may be transmitted and/or received to provide TOI field
configuration information. In the present embodiment, the TCD
provides TOI field configuration information of transport packets
corresponding to one transport session. The TCD may be transmitted
through internal means and/or external means of a signaling
transport session. When the TCD is transmitted through the internal
means, the TCD may be identified with a unique TOI value, e.g. 0 or
0xFFFF and interpreted prior to other signaling messages
transmitted along therewith. When the TCD is transmitted through
the external means, the TCD is transmitted through an FIC, separate
IP datagram or a different ROUTE session prior to objects delivered
in the corresponding session such that the receiver may previously
recognize TOI field configuration information included in each
packet. @typeBits and following fields respectively indicate the
lengths of fields in TOI and represent that field information
corresponding to the respective lengths is described in the order
of bits from the TOI start bit.
[1081] The TCD according to an embodiment of the present invention
may include @protocolVersion, @dataVersion, @validFrom,
@expiration, @typeBits, @versionBits, @instanceIdBits,
@validFromBits, @expirationBits and/or @payloadFormatBits
information.
[1082] The @protocolVersion identifies the version of the TCD. The
@protocolVersion information indicates a variation in the protocol
or structure of the TCD if the variation is present.
[1083] The @dataVersion information identifies the version of an
instance of the TCD. The @dataVersion indicates variation in the
contents of the TCD if the contents of the TCD are changed.
[1084] The @validFrom information indicates the time from which
instances of the TCD are available. The receiver may recognize the
time from which the TCD is available using the @validFrom
information and use information of the TCD from the corresponding
time.
[1085] The @expiration information indicates the time at which
availability of the instances of the TCD expires. The receiver may
recognize the time at which availability of the TCD expires and
terminate use of information of the TCD using the @expiration
information. The receiver may manage TCD information using the
@expiration information.
[1086] The @typeBits information indicates the length of the type
field in the TOI field. The @typeBits information may represent the
length of the type field in bits.
[1087] The @versionBits information indicates the length of the
version field in the TOI field. The @versionBits information may
represent the length of the version field in bits.
[1088] The @instanceIdBits information indicates the length of the
instanceID field in the TOI field in bits.
[1089] The @validFromBits information indicates the length of the
validFrom field in the TOI field in bits.
[1090] The @expirationBits information indicates the length of the
expiration field in the TOI field in bits.
[1091] The @payloadFormatBits information indicates the length of
the payloadFormat field in the TOI field in bits.
[1092] FIG. 95 illustrates a payload format element of a transport
packet according to an embodiment of the present invention.
[1093] According to an embodiment of the present invention, a
signaling message may be transmitted through a payload of a
transport packet. To this end, the transport packet may include the
payload format element shown in the figure. The transport packet
corresponds to a packet carrying objects including broadcast data.
The name of the transport packet according to the present invention
may depend on the protocol by which the packet is processed. For
example, when the packet is processed through ROUTE, the packet may
be called a ROUTE packet.
[1094] The payload format element may be included in LSID as
described above.
[1095] The payload format element of the transport packet according
to the present invention may include @codePoint,
@deliveryObjectFormat, @fragmentation, @deliveryOrder,
@sourceFecPayloadID and/or TCID (TOI Configuration Instance
Description) information.
[1096] The @codePoint information defines what code point is used
for the corresponding payload. This information may play the same
role as the aforementioned CP element or may have the same value as
the CP element.
[1097] The @deliveryObjectFormat information specifies the payload
format of an object for data delivery. For example, this
information may indicate that the object carries a signaling
message, a file, an entity, a package or metadata including an
initialization segment.
[1098] The @fragmentation information specifies the type of
fragmentation.
[1099] The @deliveryOrder information specifies the order of
delivery of objects. For example, this information may be used to
specify the order of objects transmitted through the current
payload.
[1100] The @sourceFecPayloadID information defines the format of
the Source FEC Payload ID.
[1101] When part of the TCID is used for description of
variable-length signaling message related information, the TCID may
include TOI field configuration information.
[1102] FIG. 96 illustrates TOI configuration instance description
(TCID) according to an embodiment of the present invention.
[1103] Part of the TOI field is used for description of
variable-length signaling message related information and a TOI
field configuration may be dynamically changed in one transport
session.
[1104] For description of signaling message related information in
the variable-length TOI field, TPO field configuration information
may be separately transmitted. Such TOI field configuration
information may be transmitted in the illustrated format.
[1105] In the present embodiment, the TCID provides TOI field
configuration information of transport packets corresponding to a
group of packets mapped to one code point value. The TCID may be
included in PayloadFormat in SourceFlow of the LSID. Internal
fields of the TCID may correspond to those of the aforementioned
TCD and indicate a TOI configuration of packets having the same CP
value as @codePoint included along with the TCID in PayloadFormat.
A method of configuring the TOI may correspond to the
aforementioned TCD configuration method.
[1106] The TCID according to an embodiment of the present invention
may include @typeBits, @versionBits, @instanceIdBits,
@validFromBits, @expirationBits and/or @payloadFormatBits
information. For description of such information, refer to
description of the aforementioned information having the same
names.
[1107] FIG. 97 illustrates a syntax of a fast information channel
(FIC) payload according to an embodiment of the present
invention.
[1108] While signaling data including information for service scan
or acquisition is referred to as FIC in the present invention, the
name of the signaling data is not limited thereto. A description
will be given of signaling data providing information for acquiring
broadcast services more effectively at a lower layer of the service
layer (or level). For example, such signaling data may be called a
service list table or a service list element.
[1109] While the signaling data structure is shown in the form of a
binary table for convenience of description in the present
invention, identical or similar information belonging to the table
may be implemented in XML.
[1110] FIC according to an embodiment of the present invention may
include FIC_protocol_version information, transport_stream_id
information, num_partitions information, partition_id information,
partition_protocol_version information, num_services information,
service_id information, service_data_version information,
service_channel_number information, service_category information,
short_service_name_length information, short_service_name
information, service_status information, service_distribution
information, sp_indicator information, IP_version_flag information,
SSC_source_IP_address_flag information, SSC_source_IP_address
information, SSC_destination_IP_address information,
SSC_destination_UDP_port information, SSC_TSI information,
SSC_DP_ID information, num_partition level_descriptors information,
a partition_level_descriptor( ) element, num_FIC_level_descriptors
information and/or an FIC_level_descriptor( ) element.
[1111] The FIC_protocol_version information specifies the version
of the structure of the FIC.
[1112] The transport_stream_id information specifies a broadcast
stream. This information may correspond to information specifying a
whole broadcast stream.
[1113] The num_partitions information indicates the number of
partitions in a broadcast stream. A single broadcast stream may be
divided into one or more partitions and each partition may include
one or more data pipes used by a single broadcaster (or broadcast
source).
[1114] The partition_id information specifies a partition.
[1115] The partition_protocol_version information specifies the
version of the structure of a partition.
[1116] The num_services information indicates the number of
broadcast services one or more components of which are transmitted
through the partition.
[1117] The service_id information specifies a service (or broadcast
service).
[1118] The service_data_version information specifies a variation
in a service entry for a service signaled by the FIC when the
variation is present. In addition, the service_data_version
information specifies a variation in a signaling table for
services, included in a service signaling channel (or service level
signaling) when the variation is present. The value of the
service_data_version information may be increased whenever the
variation is present to indicate the variation.
[1119] The service_channel_number information indicates the channel
number for a service.
[1120] The service_category information indicates the category of a
service. For example, the service_category information may indicate
that a broadcast service is an A/V service, an audio service, an
ESG (Electronic Service Guide), an App based service and/or CoD
(Content on Demand).
[1121] The short_service_name_length information indicates the
length of the short_service_name information. The
short_service_name_length may have a value of "0" when the
short_service name information is not present.
[1122] The short_service_name information indicates the short name
of a service. Each character indicated by the short_service_name
information may be encoded per UTF-8. When there is an odd number
of bytes in the short name, the second byte of the last of the byte
pair per pair count indicated by the short_service_name_length
field may contain 0x00.
[1123] The service_status information indicates the status of a
service. The service_status information may indicate that the
broadcast service is active, inactive, suspended, hidden and/or
shown.
[1124] The service_distribution information specifies whether
representation of broadcast services or broadcast content is
possible only with the current partition, the current partition is
necessary for the representation although the representation is
impossible only with the current partition, other partitions are
necessary for the representation, or other broadcast streams are
necessary for the representation.
[1125] The sp_indicator information indicates application of
service protection. The sp_indicator information specifies whether
one or more components of a broadcast service, which are necessary
for significant representation, are protected.
[1126] The IP_version_flag information specifies whether the IP
address indicated by the SSC_source_IP_address information and/or
the SSC_destination_IP_address is an IPv4 address or an IPv6
address.
[1127] The SSC_source_IP_address_flag information specifies
presence of the SSC_source_IP_address information for services.
[1128] The SSC_source_IP_address information is present when the
value of the SSC_source_IP_address_flag information is set to "1"
and not present when the value of the SSC_source_IP_address_flag
information is set to "0". The SSC_source_IP_address information
indicates the source IP address of an IP datagram (or data unit)
carrying signaling information for a service. The
SSC_source_IP_address information may be 128 bits when an IPv6
address is used.
[1129] The SSC_destination_IP_address information indicates the
destination IP address of the IP datagram (or data unit) carrying
the signaling information for the service. The
SSC_destination_IP_address information may be 128 bits when an IPv6
address s is used.
[1130] The SSC_destination_UDP_port information indicates the
destination UDP port number for UDP/IP streams carrying the
signaling information for the service.
[1131] The SSC_TSI information indicates a transport session
identifier (TSI) of an LCT channel through which signaling
information (or signaling table) for a service is transmitted.
[1132] The SSC_DP_ID information specifies a data pipe including
signaling information (or a signaling table) for a service. The
data pipe through which the signaling information is transmitted
may correspond to the most robust data pipe in the current
partition or broadcast stream.
[1133] The num_partition_level_descriptors information indicates
the number of partition level descriptors defined for
partitions.
[1134] The partition_level_descriptor( ) element includes one or
more partition level descriptors. A partition level descriptor may
include information necessary for the receiver to access, acquire
or use partitions.
[1135] The num_FIC_level_descriptors information indicates the
number of FIC level descriptors defined for the FIC.
[1136] The FIC_level_descriptor( ) element includes one or more FIC
level descriptors. An FIC level descriptor may include additional
signaling information for the FIC.
[1137] FIG. 98 illustrates a syntax of a payload of the FIC
according to another embodiment of the present invention.
[1138] The payload of the FIC according to another embodiment of
the present invention may additionally include SSC_delivery_type,
SSC_URL_length and/or SSC_URL_data information in addition to the
FIC payload in the aforementioned embodiment.
[1139] The SSC_delivery_type information specifies a path through
which signaling information (e.g. service signaling channel or
service level signaling) associated with a service is delivered.
The SSC_delivery_type information may specify whether service level
signaling data is transmitted through a broadband network
(Internet). For example, the SSC_delivery_type information may
indicate that service level signaling is transmitted through a
broadcast network when the value thereof is 0x01. The
SSC_delivery_type information may indicate that service level
signaling is transmitted through the Internet when the value
thereof is 0x02.
[1140] The SSC_URL_length information indicates the length of the
SSC_URL_data information.
[1141] The SSC_URL_data information indicates the URL of a service
or location providing signaling information associated with a
service.
[1142] For description of information which is not described in the
present embodiment, refer to the aforementioned corresponding
description.
[1143] FIG. 99 illustrates a syntax of service level signaling
according to another embodiment of the present invention.
[1144] Information necessary for the receiver to receive a
broadcast service and/or broadcast content that a viewer desires
may be referred to as service level signaling. The service level
signaling includes information describing attributes of broadcast
services and components included in broadcast services.
[1145] Service level signaling data according to another embodiment
of the present invention may include a signaling message header
and/or a service signaling message.
[1146] The service level signaling data according to another
embodiment of the present invention may include @service_id
information, @service_category information, @service_name
information, @channel_number information, @service_status
information, @service_distribution information, @SP_indicator
information, a ROUTE Session element, @sourceIPAddr information,
@destIPAddr information, @destUDPPort information, @LSID_DP
information, a Targeting element, a Content Advisory element, a
Right Issuer Service element, a Current Program element, an
Original Service Identification element, a Content Labeling
element, a Genre element, a Caption element and/or a Protection
element.
[1147] The @service_id information specifies a broadcast
service.
[1148] The @service_category information specifies the category of
the broadcast service. For example, the @service_category
information may specify whether the broadcast service is an audio
service, a real-time broadcast service, a non-real time broadcast
service, a linear broadcast service, an app-based broadcast service
or a service guide.
[1149] The @service_name information indicates the name of the
broadcast service.
[1150] The @channel_number information indicates the channel number
corresponding to the channel through which the broadcast service is
transmitted. This channel number may correspond to a
logical/physical channel number. This channel number may be used as
information specifying a logical path or a transport unit through
which service level signaling data is transmitted as necessary.
[1151] The @service_status information indicates the status of the
broadcast service. The @service_status information may include
information specifying whether the broadcast service is active or
inactive. The @service_status information may include information
specifying whether the broadcast service is hidden.
[1152] The @service_distribution information indicates how data or
components for the broadcast service are distributed and
transmitted.
[1153] The @SP_indicator information specifies whether service
protection has been applied to the broadcast service or at least
one component included in the broadcast service. The @SP_indicator
information may correspond to information specifying whether
service protection has been applied to data units or components for
meaningful representation of the broadcast service.
[1154] The ROUTE Session element includes information about a ROUTE
session through which the broadcast service or components included
in the broadcast service are transmitted.
[1155] The @sourceIPAddr information indicates the source IP
address of IP datagrams (or data units) carrying a ROUTE
packet.
[1156] The @destIPAddr information indicates the destination IP
address of the IP datagrams (or data units) carrying the ROUTE
packet.
[1157] The @destUDPPort information indicates the destination port
number of the IP datagrams (or data units) carrying the ROUTE
packet.
[1158] The @LSID_DP information specifies a data pipe through which
information (e.g. LSID) that describes transport parameters
associated with the ROUTE session and/or lower sessions of the
ROUTE session is delivered.
[1159] The Targeting element includes information for providing
personalized broadcast services (targeted broadcast). This element
may be included in service level signaling as a separate signaling
structure. In this case, this element may include link information
about the service level signaling.
[1160] The Content Advisory element includes information about
rating of the broadcast service. This element may be included in
service level signaling as a separate signaling structure. In this
case, this element may include link information about the service
level signaling. The Right Issuer Service element includes
information related to the right to appropriately consume the
broadcast service. This element may be included in service level
signaling as a separate signaling structure. In this case, this
element may include link information about the service level
signaling.
[1161] The Current Program element includes information about the
current broadcast program. This element may be included in service
level signaling as a separate signaling structure. In this case,
this element may include link information about the service level
signaling.
[1162] The Original Service Identification element includes
information for specifying the original service associated with the
current broadcast service. This element may be included in service
level signaling as a separate signaling structure. In this case,
this element may include link information about the service level
signaling.
[1163] The Content Labeling element includes information about
content labeling. This element may be included in service level
signaling as a separate signaling structure. In this case, this
element may include link information about the service level
signaling. The Genre element includes information for classifying
the genre of the broadcast service. This element may be included in
service level signaling as a separate signaling structure. In this
case, this element may include link information about the service
level signaling.
[1164] The Caption element includes information about the closed
caption/subtitle of the broadcast service. This element may be
included in service level signaling as a separate signaling
structure. In this case, this element may include link information
about the service level signaling.
[1165] The Protection element includes information about protection
for the broadcast service. When the aforementioned @SP_indicator
information specifies that protection has been applied to the
broadcast service or broadcast components, the Protection element
may provide detailed information about the protection. This element
may be included in service level signaling as a separate signaling
structure. In this case, this element may include link information
about the service level signaling.
[1166] FIG. 100 illustrates component mapping description according
to another embodiment of the present invention.
[1167] The component mapping description according to another
embodiment of the present invention may further include
@partitionID information in addition to the information or elements
included in the component mapping description according to the
aforementioned embodiment.
[1168] The @partitionID information specifies a partition
indicating a broadcast station in a broadcast stream. The
@partitionID information may be used as information that specifies
the transmission source of broadcast components.
[1169] Description of other information or elements included in the
component mapping description is replaced with the aforementioned
description of information or elements in the same names.
[1170] FIG. 101 illustrates a syntax of URL signaling description
according to another embodiment of the present invention.
[1171] As described above, signaling information that describes a
broadcast service may be transmitted through a broadband network as
well as a broadcast network. When the signaling information that
describes a broadcast service is transmitted through the broadband
network, the receiver may acquire the signaling information through
the URL signaling description.
[1172] The URL signaling description according to another
embodiment of the present invention may include @service_id,
@smtURL, @mpdURL, @cmtURL, @astURL, @gatURL and/or @eatURL
information.
[1173] The @service_id information specifies a service.
[1174] The @smtURL information indicates the URL of a server or
location providing a service map table (SMT) when the SMT is
transmitted through the broadband network.
[1175] The @mpdURL information indicates the URL of a server or
location providing an MPD when the MPD is transmitted through the
broadband network.
[1176] The @cmtURL information indicates the URL of a server or
location providing a component mapping table (CMT) when the CMT is
transmitted through the broadband network.
[1177] The @astURL information indicates the URL of a server or
location providing an application signaling table (AST) when the
AST is transmitted through the broadband network.
[1178] The @gatURL information indicates the URL of a server or
location providing a guide access table (GAT) when the GAT is
transmitted through the broadband network. The GAT corresponds to a
signaling message including information for bootstrapping of an
electronic service guide (ESG). That is, the GAT may correspond to
a signaling message including information necessary for the
receiver to access the ESG.
[1179] The @eatURL information indicates the URL of a server or
location providing an emergency alert table (EAT) when the EAT is
transmitted through the broadband network. The EAT corresponds to a
signaling message including emergency alert related information and
an emergency alert message.
[1180] FIG. 102 illustrates a SourceFlow element according to
another embodiment of the present invention.
[1181] Broadcast service data may be transmitted per object through
a ROUTE session. Objects may be individually recovered. A source
protocol may be defined to transmit objects within one session, and
the SourceFlow element including information related to source
(object) delivery may be defined in the source protocol.
[1182] The SourceFlow element according to another embodiment of
the present invention may further include @location information in
addition to the information/attributes/elements included in the
aforementioned SourceFlow element.
[1183] The @location information indicates a location or a data
unit carrying source flow data. The @location information specifies
a data pipe in a broadcast stream. The receiver may recognize that
the source flow data is transmitted through the data pipe.
[1184] Description of other information/attributes/elements
included in the SourceFlow element is replaced by description of
the aforementioned SourceFlow element.
[1185] FIG. 103 illustrates a process of acquiring signaling
information through a broadcast network according to another
embodiment of the present invention.
[1186] The receiver may access a location carrying data of a
service signaling channel associated with a desired broadcast
service using information that specifies services included in an
FIC.
[1187] The receiver acquires information about the source IP
address, destination IP address and/or UDP port number of IP
datagrams carrying the data of the service signaling channel, in
the FIC.
[1188] The receiver acquires information that specifies a data pipe
including the data of the service signaling channel, in the FIC.
The receiver may access the data pipe carrying the data of the
service signaling channel through the acquired information.
[1189] The receiver may access an LCT session through which the
data of the service signaling channel is transmitted using
information that specifies the LCT session, which is included in
the FIC. The LCT session through which the data of the service
signaling channel is transmitted may be fixed to an LCT session
having a specific TSI. In this case, the receiver may access the
LCT session having the specific TSI in order to acquire the data of
the service signaling channel without additional information. The
receiver may access the corresponding location to acquire the data
of the service signaling channel.
[1190] The receiver may access an LCT session through which the
aforementioned LSID is transmitted. In this case, the TSI of the
LCT session may be fixed, and the receiver may access the LCT
session having the TSI to acquire the LSID. The receiver may
acquire components included in the broadcast service using
information of the LSID.
[1191] FIG. 104 illustrates a process of acquiring signaling
information through a broadcast network and a broadband network
according to another embodiment of the present invention.
[1192] The receiver may access a location carrying data of a
service signaling channel associated with a desired broadcast
service using information that specifies services included in an
FIC.
[1193] The receiver acquires information about the source IP
address, destination IP address and/or UDP port number of IP
datagrams carrying the data of the service signaling channel, in
the FIC.
[1194] The receiver acquires information that specifies a data pipe
including the data of the service signaling channel, in the FIC.
The receiver may access the data pipe carrying the data of the
service signaling channel through the acquired information.
[1195] The receiver accesses the data of the service signaling
channel to acquire the aforementioned URL signaling table or URL
signaling description. The receiver may access a server or location
providing service level signaling using information included in the
URL signaling table to acquire the service level signaling through
the broadband network.
[1196] FIG. 105 illustrates a process of acquiring signaling
information through a broadband network according to another
embodiment of the present invention.
[1197] When information specifying the transport type of a service
signaling channel, included in an FIC, indicates that data of the
service signaling channel is transmitted through the broadband
network, the receiver acquires URL information about a service or
location providing the data of the service signaling channel in the
FIC. In this case, the URL information may indicate the URL of a
single server or location providing the whole data of the service
signaling channel or URLs of servers or locations respectively
providing signaling structures (SMT, MPD, CMT, etc.) that may be
included in the service signaling channel.
[1198] The receiver accesses the server or location indicated by
the URL information to acquire the data of the service signaling
channel through the broadband network.
[1199] FIG. 106 illustrates a process of acquiring an electronic
service guide (ESG) through a broadcast network according to
another embodiment of the present invention.
[1200] The receiver may recognize that a broadcast service
corresponds to an ESG from information specifying the category of
the service, which is included in an FIC, and acquire information
specifying a data pipe through which data of a service signaling
channel with respect to the corresponding service is
transmitted.
[1201] The receiver may access the specified data pipe to acquire
data of the ESG, transmitted through the data pipe.
[1202] While the ESG is regarded as a broadcast service, the ESG
may be efficiently acquired through the aforementioned process
since the complicated signaling structure to access general
broadcast services need not be interpreted.
[1203] FIG. 107 illustrates a process of acquiring video segments
and audio segments of a broadcast service through a broadcast
network according to another embodiment of the present
invention.
[1204] The receiver acquires data of a service signaling channel
and obtains a signaling structure (e.g. CMT) including information
that describes components of the broadcast service, which is
included in the data of the service signaling channel.
[1205] The receiver acquires information specifying a data pipe
through which a video component of the broadcast service is
transmitted in the signaling structure and accesses the data pipe
using the acquired information. The receiver acquires a signaling
structure (e.g. LSID) that describes an LCT session in a ROUTE
session through which the data pipe is transmitted.
[1206] The receiver accesses the LCT session through which the
video component of the broadcast service is transmitted to acquire
the video component from the signaling structure that describes the
LCT session.
[1207] The receiver acquires information specifying a data pipe
through which an audio component of the broadcast service is
transmitted and accesses the data pipe using the acquired
information. The receiver acquires a signaling structure (e.g.
LSID) that describes an LCT session in a ROUTE session through
which the data pipe is transmitted.
[1208] The receiver accesses the LCT session through which the
audio component of the broadcast service is transmitted to acquire
the audio component from the signaling structure that describes the
LCT session.
[1209] According to the present invention, it is possible to
efficiently acquire components included in the broadcast service
through the aforementioned signaling structure even when the
components are transmitted through respective transport paths. In
addition, the transmitter may freely transmit components of
broadcast services through a region having a margin and thus may
efficiently transmit a larger amount of broadcast data.
[1210] FIG. 108 illustrates a process of acquiring video segments
of a broadcast service through a broadcast network and acquiring
audio segments of the broadcast service through a broadband network
according to another embodiment of the present invention.
[1211] The receiver acquires data of a service signaling channel
and obtains a signaling structure (e.g. CMT) including information
that describes components of the broadcast service, which is
included in the data of the service signaling channel.
[1212] The receiver acquires information specifying a data pipe
through which a video component of the broadcast service is
transmitted in the signaling structure and accesses the data pipe
using the acquired information. The receiver acquires a signaling
structure (e.g. LSID) that describes an LCT session in a ROUTE
session through which the data pipe is transmitted.
[1213] The receiver accesses the LCT session through which the
video component of the broadcast service is transmitted to acquire
the video component from the signaling structure that describes the
LCT session.
[1214] The receiver recognizes that an audio component is
transmitted through the broadband network from the signaling
structure including the information that describes the components
of the broadcast service and acquires the address of a server or
location carrying the audio component. Alternatively, the receiver
acquires the address providing segments of the audio component
using MPD and obtains the segments of the audio component from the
address.
[1215] According to the present invention, even when components
belonging to one broadcast service are respectively transmitted
through heterogeneous networks, it is possible to efficiently
access the components of the broadcast service through the
aforementioned signaling structure.
[1216] FIG. 109 illustrates a configuration of a
clock_reference_bootstrap_descriptor according to an embodiment of
the present invention.
[1217] An embodiment of the present invention may provide a method
for transmitting and/or signaling a clock reference. The clock
reference according to an embodiment of the present invention may
provide a reference time at which the receiver synchronizes and
consumes content and services transmitted from the future broadcast
system.
[1218] The clock reference according to an embodiment of the
present invention may include consecutive and periodic clock
reference values. The clock reference may be transmitted in the
form of a signaling message and/or an independent stream. Here, the
signaling message may correspond to signaling information and
include a Fast Information Channel (FIC) and a Service Map Table
(SMT). The FIC may correspond to a Service List Table (SLT) and the
SMT may correspond to a User Service Description (USD).
[1219] The clock_reference_bootstrap_descriptor according to an
embodiment of the present invention may provide information used
for the receiver to access the clock reference when the clock
reference is transmitted in the form of an independent stream. A
clock_reference_value_descriptor according to an embodiment of the
present invention, which will be described later, may provide clock
reference values when the clock reference is directly transmitted
through a signaling message.
[1220] According to an embodiment of the present invention, the
clock reference may be transmitted in a physical layer. The clock
reference may be transmitted in a preamble and/or a base PLP part
of a physical frame. The clock reference is information necessary
for synchronization of the transmitter and the receiver and may be
included in the relatively robust physical layer in order to reduce
errors.
[1221] The clock_reference_bootstrap_descriptor and/or the
clock_reference_value_descriptor according to an embodiment of the
present invention may be represented in various formats such as the
binary format and XML. The clock_reference_bootstrap_descriptor
and/or the clock_reference_value_descriptor according to an
embodiment of the present invention may be present in various
locations in a signaling message. Here, the signaling message may
include a low level signaling message and a service level signaling
message. The low level signaling message may include an SLT and an
RRT (Rating Region Table) and the service level signaling message
may include USBD/USD (User Service Bundle Description/User Service
Description), S-TSID (Service-based Transport Session Instance
Description) and MPD (Media Presentation Description). Here, the
SLT may correspond to the FIC and/or PAT and the USBD/USD may
correspond to the SMT.
[1222] The clock_reference_bootstrap_descriptor according to an
embodiment of the present invention may include descriptor_tag,
descriptor_length, IP_version_flag, source_IP_address_flag,
TSI_flag, DP_ID flag, source_IP_address, TSI_flag, DP_ID_flag,
source_IP_address, destination_IP_address, destination_UDP_port,
TSI and/or DP_ID fields.
[1223] The descriptor_tag field specifies that the corresponding
descriptor is the clock_reference_bootstrap_descriptor by being
assigned a unique value.
[1224] The descriptor_length field indicates the length of the
corresponding descriptor in bytes.
[1225] The IP_version_flag field indicates the format of the
following IP address field. This field may indicate that IPv4
address format is used when the value there of is 0 and IPv6
address format is used when the value thereof is 1.
[1226] The source_IP_address_flag field indicates whether the
corresponding descriptor includes the IP_address field. The
source_IP_address_flag field indicates that the descriptor includes
the source_IP_address field when the value thereof is 1.
[1227] The TSI_flag field indicates whether the corresponding
descriptor includes the TSI field. The TSI_flag field indicates
that the descriptor includes the TSI field when the value thereof
is 1.
[1228] The DP_ID_flag field indicates whether the corresponding
descriptor includes the DP_ID field. The DP_ID_flag field indicates
that the descriptor includes the DP_ID field when the value thereof
is 1.
[1229] The source_IP_address field indicates the source IP address
of IP datagrams including a clock reference stream. Here, the clock
reference stream refers to a stream carrying the clock reference
when the clock reference is transmitted as an independent
stream.
[1230] The destination_IP_address field indicates the destination
IP address of the IP datagrams including the clock reference
stream.
[1231] The destination_UDP_port field indicates the destination UDP
port number of the IP datagrams including the clock reference
stream.
[1232] The TSI field indicates the session identifier of an LCT
session including the clock reference stream.
[1233] The DP_ID field indicates the identifier of a data pipe
through which the clock reference stream is transmitted. Here, the
data pipe may correspond to a physical layer pipe.
[1234] FIG. 110 illustrates a configuration of a
clock_reference_value_descriptor according to an embodiment of the
present invention.
[1235] The clock_reference_value_descriptor according to an
embodiment of the present invention may provide clock reference
values when the clock reference is directly transmitted through a
signaling message.
[1236] The clock_reference_value_descriptor according to an
embodiment of the present invention may include descriptor_tag,
descriptor_length, clock_reference_value_version and/or
clock_reference_value fields.
[1237] The descriptor_tag field specifies that the corresponding
descriptor is the clock_reference_value_descriptor by being
assigned a unique value.
[1238] The descriptor_length field indicates the length of the
corresponding descriptor in bytes.
[1239] The clock_reference_value_version field indicates the format
of the following clock_reference_value field. According to an
embodiment of the present invention, a 32-bit NTP timestamp may be
used when the clock_reference_value_version field is 0 and a 64-bit
NTP timestamp may be used when this field is 1, and an 80-bit PTP
timestamp may be used when this field is 2.
[1240] The clock_reference_value field indicates the value of the
clock reference represented in the timestamp format determined by
the aforementioned clock_reference_value_version field. According
to an embodiment of the present invention, the
clock_reference_value field may indicate the current time of the
transmitter and the time when the clock_reference_value_descriptor
is generated. According to an embodiment of the present invention,
the clock_reference_value field may be used for system clock
synchronization between the transmitter and the receiver.
[1241] FIG. 111 illustrates a configuration of a Fast Information
Channel (FIC) according to an embodiment of the present
invention.
[1242] According to an embodiment of the present invention, the
aforementioned clock_reference_bootstrap_descriptor and/or
clock_reference_value_descriptor may be transmitted at a dedicated
channel level, a partition level and/or a service level.
[1243] According to an embodiment of the present invention, when
the sequence of a single clock reference is transmitted through a
single dedicated channel, all content and services transmitted
through the dedicated channel may be synchronized through the clock
reference.
[1244] According to an embodiment of the present invention, the
clock_reference_bootstrap_descriptor and/or the
clock_reference_value_descriptor may be located in the FIC level
descriptor of the aforementioned FIC. That is, the
clock_reference_bootstrap_descriptor and/or the
clock_reference_value_descriptor may be transmitted at the
dedicated channel level. According to an embodiment of the present
invention, when the clock_reference_bootstrap_descriptor is located
in the FIC_level_descriptor of the FIC, the clock reference is
transmitted in the form of a stream and the receiver may access the
stream through which the clock reference is transmitted using
bootstrap information included in the
clock_reference_bootstrap_descriptor. According to an embodiment of
the present invention, when the clock_reference_value_descriptor is
located in the FIC_level_descriptor of the FIC, the clock reference
values may be directly transmitted through the FIC. According to
another embodiment of the present invention, the clock reference
values instead of the clock_reference_value_descriptor may be
located in the FIC_level_descriptor of the FIC.
[1245] According to another embodiment of the present invention, a
single dedicated channel may be divided into multiple partitions
and each partition may be allocated per broadcaster. According to
an embodiment of the present invention, when the sequence of a
single clock reference is transmitted through a single partition,
all content and services in the partition may be synchronized
through the clock reference.
[1246] According to an embodiment of the present invention, the
clock_reference_bootstrap_descriptor and/or the
clock_reference_value_descriptor may be located in the
aforementioned partition_level_descriptor of the FIC. That is, the
clock_reference_bootstrap_descriptor and/or the
clock_reference_value_descriptor may be transmitted at the
partition level. According to an embodiment of the present
invention, when the clock_reference_bootstrap_descriptor is located
in the partition_level_descriptor of the FIC, the clock reference
is transmitted in the form of a stream and the receiver may access
the stream through which the clock reference is transmitted using
bootstrap information included in the
clock_reference_bootstrap_descriptor. According to an embodiment of
the present invention, when the clock_reference_value_descriptor is
located in the partition_level_descriptor of the FIC, the clock
reference values may be directly transmitted through the FIC.
According to another embodiment of the present invention, the clock
reference values instead of the clock_reference_value_descriptor
may be located in the partition_level_descriptor of the FIC.
[1247] The FIC according to an embodiment of the present invention
may include FIC_protocol_version, transport_stream_id,
num_partitions, partition_id, num_partition_level_descriptors,
partition_level_descriptor, num_FIC_level_descriptors and/or
FIC_level_descriptor fields.
[1248] The FIC_protocol_version field indicates the version of the
FIC.
[1249] The transport_stream_id field specifies a broadcast
stream.
[1250] The num_partitions field indicates the number of partitions
included in the broadcast stream. Here, a partition may refer to a
broadcasting station.
[1251] The partition_id field specifies a partition.
[1252] The num_partition_level_descriptors field indicates the
number of descriptors included in the partition level.
[1253] The partition_level_descriptor indicates descriptors
included in the partition level. According to an embodiment of the
present invention, the partition_level_descriptor may include the
clock_reference_bootstrap_descriptor and/or the
clock_reference_value_descriptor.
[1254] The num_FIC_level_descriptors field indicates the number of
descriptors included in the dedicated channel level. The dedicated
channel level may correspond to the FIC and/or broadcast stream
levels.
[1255] The FIC_level_descriptor field indicates descriptors
included in the dedicated channel level. According to an embodiment
of the present invention, the clock_reference_bootstrap_descriptor
and/or the clock_reference_value_descriptor may be included in this
descriptor.
[1256] FIG. 112 illustrates a configuration of an FIC according to
another embodiment of the present invention.
[1257] According to an embodiment of the present invention, when
the clock reference is transmitted in the form of a stream at the
partition level, the clock reference may be allocated to a single
service and information used to access the stream through which the
clock reference is transmitted may be signaled.
[1258] According to an embodiment of the present invention, the
clock reference stream may be transmitted through a single service
constituting a partition. According to an embodiment of the present
invention, whether the service carries the clock reference stream
may be signaled through a service_category field and a specific
value for the clock reference stream may be allocated to the
service_category field. When the corresponding service is
identified as a service through which the clock reference stream is
transmitted through the service_category field according to an
embodiment of the present invention, IP_version_flag,
SSC_source_IP_address_flag, SSC_source_IP_address,
SSC_destination_IP_address, SSC_destination_UDP_port, SSC_TSI
and/or SSC_DP_ID fields, which follow the service_category field,
may be used as bootstrap information for accessing the clock
reference stream.
[1259] The FIC according to an embodiment of the present invention
may include FIC_protocol_version, transport_stream_id,
num_partitions, partition_id, service_id, service_category,
IP_version_flag, SSC_source_IP_address_flag, SSC_source_IP_address,
SSC_destination_IP_address, SSC_destination_UDP_port, SSC_TSI
and/or SSC_DP_ID fields.
[1260] The FIC_protocol_version field indicates the version of the
FIC.
[1261] The transport_stream_id field specifies a broadcast
stream.
[1262] The num_partitions field indicates the number of partitions
included in the broadcast stream. Here, a partition may refer to a
broadcasting station.
[1263] The partition_id field specifies a partition.
[1264] The service_id field specifies that the corresponding
service includes the clock reference stream.
[1265] The service_category field indicates the type of the service
and may be used to specify that the service according to an
embodiment of the present invention is a service through which the
clock reference stream is transmitted.
[1266] The IP_version_flag field indicates the format of the
following IP address field. This field may indicate that IPv4
address format is used when the value thereof is 0 and indicate
that IPv6 address format is used when the value thereof is 1.
[1267] The SSC_source_IP_address_flag field indicates whether the
corresponding service includes the source_IP_address field. This
field indicates that the service includes the source_IP_address
field when the value thereof is 1.
[1268] The SSC_source_IP_address field indicates the source IP
address of IP datagrams including the clock reference stream. Here,
the clock reference stream may refer to a stream carrying the clock
reference when the clock reference is transmitted as an independent
stream.
[1269] The SSC_destination_IP_address field indicates the
destination IP address of the IP datagrams including the clock
reference stream.
[1270] The SSC_destination_UDP_port field indicates the destination
UDP port number of the IP datagrams including the clock reference
stream.
[1271] The SSC_TSI field indicates the session identifier of an LCT
session including the clock reference stream.
[1272] The SSC_DP_ID field indicates the identifier of a data pipe
through which the clock reference stream is transmitted. Here, the
data pipe may correspond to a physical layer pipe.
[1273] FIG. 113 illustrates a configuration of service description
according to an embodiment of the present invention.
[1274] According to an embodiment of the present invention, when a
sequence of a single clock reference is transmitted in a single
service, all content and streams in the service may be synchronized
through the clock reference.
[1275] According to an embodiment of the present invention,
bootstrap information of the clock reference corresponding to a
single service may be transmitted. Here, the bootstrap information
may refer to information for accessing the clock reference
stream.
[1276] According to an embodiment of the present invention, a
sequence of clock reference values may be configured as an
additional clock reference stream and transmitted through a payload
of the corresponding stream packet or included in a header of a
stream packet carrying a component and transmitted.
[1277] According to an embodiment of the present invention, when
the clock reference values are included in the header of the stream
packet carrying the component, the clock reference values may be
delivered using EXT_TIME extension of an LCT packet header.
[1278] According to an embodiment of the present invention, when
the clock reference is transmitted through an internal stream
constituting a single service, the stream carrying the clock
reference may be identified through @ClockRef_TSI field. The
@ClockRef_TSI field indicates TSI information of an LCT session
through which the clock reference is transmitted from among LCT
sessions constituting a ROUTE session. According to an embodiment
of the present invention, the IP address and UDP port information
of the clock reference stream may be identified through other
fields present before the @ClockRef_TSI field in the ROUTE session.
According to an embodiment of the present invention, information
about a DP through which the clock reference stream is transmitted
may be signaled through the aforementioned LSID and CMT. Here, the
LSID may correspond to S-TSID (Service-based Transport Session
Instance Description) and the CMT may correspond to MPD (Media
Presentation Description).
[1279] According to another embodiment of the present invention,
information for accessing the clock reference stream may be
signaled by including a Clock Reference Bootstrap field in the
Service Description. The Clock Reference Bootstrap field according
to an embodiment of the present invention may include information
of the stream carrying the clock reference, such as the IP address,
UDP port, TSI and DP, like the aforementioned
clock_reference_bootstrap_descriptor.
[1280] While the illustrated Service Description includes both the
@ClockRef_TSI field and Clock Reference Bootstrap field, the
Service Description may include only one of the two fields
according to an embodiment of the present invention and may signal
the information (bootstrap information) for accessing the clock
reference stream using one of the two fields.
[1281] The Service Description according to an embodiment of the
present invention may correspond to USBD/USD and include
@service_id, @service_category, @service_name, @channel_number,
@service_status, @service_distribution, @SP_indicator, ROUTE
Session, @sourceIPAddr, @destIPAddr, @destUDPPort, @LSID_DP,
@ClockRef_TSI, Targeting, Content Advisory, Right Issuer Service,
Current Program, Original Service Identification, Content Labeling,
Genre, Caption, Protection and/or Clock Reference Bootstrap
fields.
[1282] The @service_id field specifies a service.
[1283] The @service_category field indicates the type of the
service.
[1284] The @service_name field indicates the name of the
service.
[1285] The @channel_number field indicates the channel number
corresponding to the service.
[1286] The @service_status field indicates the status of the
service. This field may indicate whether the corresponding service
is active or inactive.
[1287] The @service_distribution field indicates whether the whole
service is included in the corresponding partition, whether
presentation of the service is possible only with the partition
although the service is partially included in the partition,
whether another partition is necessary for the presentation or
whether another broadcast stream is necessary for the
presentation.
[1288] The @SP_indicator field indicates whether one or more
components of the service have been protected. That is, this field
may indicate whether the corresponding service has been
protected.
[1289] The ROUTE session field indicates information about a ROUTE
session through which the service is transmitted.
[1290] The @sourceIPAddr field indicates the source IP address of
the ROUTE session.
[1291] The @destIPAddr field indicates the destination IP address
of the ROUTE session.
[1292] The @destUDPPort field indicates the destination UDP port
number of the ROUTE session.
[1293] The @LSID_DP field specifies a data pipe through which LSID
including information such as transport parameters of the ROUTE
session is delivered. According to an embodiment of the present
invention, this field may specify LSID including information about
one or more LCT sessions constituting the ROUTE session.
[1294] The @ClockRef_TSI field indicates TSI information of an LCT
session through which the clock reference is transmitted from among
LCT sessions constituting the ROUTE session.
[1295] The targeting field indicates a targeting parameter with
respect to the corresponding service. This field has been described
above in detail.
[1296] The Content Advisory field indicates content advisory
information about the corresponding service. According to an
embodiment of the present invention, this field may include content
advisory rating related information. This field has been described
above in detail.
[1297] The Rights Issuer Service field may include information
about rights issues with respect to the corresponding service. This
field has been described above in detail.
[1298] The Current Program field may include information about the
current program. This field has been described above in detail.
[1299] The Original Service Identification field may include
information specifying the original service. This field has been
described above in detail.
[1300] The Content Labeling field may include content labeling
related information. This field has been described above in
detail.
[1301] The genre field may include information about the genre of
the corresponding service.
[1302] The caption field may include caption related information of
the corresponding service.
[1303] The protection field may include protection related
information of the corresponding service.
[1304] The Clock Reference Bootstrap field may include information
of the clock reference stream, such as the IP address, UDP port,
TSI and DP, like the aforementioned
clock_reference_bootstrap_descriptor. That is, this field may
include information for accessing the clock reference stream.
[1305] FIG. 114 illustrates a configuration of Component Mapping
Description according to an embodiment of the present
invention.
[1306] According to an embodiment of the present invention, it is
possible to identify a clock reference stream from among streams
transmitted through the current broadcast stream or other broadcast
streams by adding @clockRefFlag field to the aforementioned
component mapping description. According to an embodiment of the
present invention, the @clockRefFlag field may indicate that the
corresponding component includes and carries the clock reference
when the value thereof is 1.
[1307] According to an embodiment of the present invention, the
number of components having a @clockRefFlag field value of 1, from
among components transmitted through one service, may be limited to
a maximum of 1.
[1308] According to an embodiment of the present invention, the TSI
and DP information of a stream carrying the clock reference may be
identified by lower fields of the aforementioned BroadcastComp
field, and the IP address and UDP port information of the stream
carrying the clock reference may be identified by lower fields of
the ROUTE session field of the aforementioned Service Description
and information provided by the LSID. According to an embodiment of
the present invention, when the stream carrying a clock reference
is transmitted through another broadcast stream, this may be
identified through lower fields of the ForignComp field.
[1309] Fields illustrated in the figure have been described in
detail.
[1310] FIG. 115 is a flowchart illustrating a method of
transmitting a broadcast signal according to an embodiment of the
present invention.
[1311] The method of transmitting a broadcast signal according to
an embodiment of the present invention may include a step SL128010
of encoding a broadcast service, first signaling information for
fast acquisition of the broadcast service, second signaling
information for discovering the broadcast service and third
signaling information for a session in which the broadcast service
and components included in the broadcast service are transmitted, a
step SL128020 of generating a broadcast signal including the
encoded broadcast service, first signaling information, second
signaling information and third signaling information and/or a step
SL128030 of transmitting the broadcast signal. Here, the broadcast
service may be an ATSC 3.0 service. The first signaling information
may refer to the aforementioned FIC and/or the SLT. The second
signaling information may refer to the aforementioned SMT, service
description and/or USD/USBD. The third signaling information may
refer to the aforementioned SMT, service description, LSID and/or
S-TSID.
[1312] According to another embodiment of the present invention, at
least one of the first signaling information, second signaling
information and third signaling information may include time
information for synchronization between a transmission side and a
reception side. Here, the time information may correspond to the
clock reference, clock reference values and/or the
clock_reference_value_descriptor, which have been described in
detail above with reference to FIGS. 110 and 111.
[1313] According to another embodiment of the present invention, at
least one of the first signaling information, second signaling
information and third signaling information may include access
information for accessing a stream carrying the time information
for synchronization of the transmission side and the reception
side. The access information may refer to the fields included in
the clock_reference_bootstrap_descriptor and/or the
clock_reference_bootstrap_descriptor, which have been described in
detail above with reference to FIGS. 109, 111 and 113.
[1314] According to another embodiment of the present invention,
the time information may include information indicating a reference
time value and/or the type of the reference time value, which are
used for synchronization of the transmission side and the reception
side. Here, the reference time value may correspond to the
clock_reference_value field and the type of the reference time
value may correspond to the clock_reference_value_version field.
The clock_reference_value field and the
clock_reference_value_version field have been described in detail
above with reference to FIG. 110.
[1315] According to another embodiment of the present invention,
the access information may include destination IP address
information of an IP datagram including the stream carrying the
time information, the UDP port number of the IP datagram including
the stream carrying the time information, information for
identifying a session including the stream carrying the time
information and/or information for identifying a data pipe through
which the stream carrying the time information is transmitted. The
information has been described in detail above with reference to
FIG. 109.
[1316] According to another embodiment of the present invention,
the first signaling information may include information about one
or more services transmitted through a single broadcast stream, and
the time information may be included in the service level of the
first signaling information to be used for synchronization of all
components in a single service. This has been described in detail
above with reference to FIGS. 112, 113 and 114.
[1317] According to another embodiment of the present invention,
the broadcast service may correspond to a broadcast service
providing the time information for synchronization between the
transmission side and the reception side, and the first signaling
information may include information for accessing the broadcast
service. This has been described in detail above with reference to
FIG. 112.
[1318] FIG. 116 is a flowchart illustrating a method of receiving a
broadcast signal according to an embodiment of the present
invention.
[1319] The method of receiving a broadcast signal according to an
embodiment of the present invention may include a step SL129010 of
receiving a broadcast signal including a broadcast service, first
signaling information for fast acquisition of the broadcast
service, second signaling information for discovering the broadcast
service and third signaling information for a session in which the
broadcast service and components included in the broadcast service
are transmitted, a step SL129020 of extracting the broadcast
service, the first signaling information, the second signaling
information and the third signaling information from the received
broadcast signal and/or a step SL129030 of decoding the extracted
broadcast service, first signaling information, second signaling
information and third signaling information. Here, the broadcast
service may be an ATSC 3.0 service. The first signaling information
may refer to the aforementioned FIC and/or the SLT. The second
signaling information may refer to the aforementioned SMT, service
description and/or USD/USBD. The third signaling information may
refer to the aforementioned SMT, service description, LSID and/or
S-TSID.
[1320] According to another embodiment of the present invention, at
least one of the first signaling information, second signaling
information and third signaling information may include time
information for synchronization between the transmission side and
the reception side. Here, the time information may correspond to
the clock reference, clock reference values and/or the
clock_reference_value_descriptor, which have been described in
detail above with reference to FIGS. 110 and 111.
[1321] According to another embodiment of the present invention, at
least one of the first signaling information, second signaling
information and third signaling information may include access
information for accessing a stream carrying the time information
for synchronization between the transmission side and the reception
side. The access information may indicate the fields included in
the clock_reference_bootstrap_descriptor and/or the
clock_reference_bootstrap_descriptor, which have been described in
detail above with reference to FIGS. 109, 111 and 113.
[1322] According to another embodiment of the present invention,
the time information may include information indicating a reference
time value and/or the type of the reference time value, which are
used for synchronization between the transmission side and the
reception side.
[1323] Here, the reference time value may correspond to the
clock_reference_value field and the type of the reference time
value may correspond to the clock_reference_value_version field.
The clock_reference_value field and the
clock_reference_value_version field have been described in detail
above with reference to FIG. 110.
[1324] According to another embodiment of the present invention,
the access information may include destination IP address
information of an IP datagram including the stream carrying the
time information, the UDP port number of the IP datagram including
the stream carrying the time information, information for
identifying a session including the stream carrying the time
information and/or information for identifying a data pipe through
which the stream carrying the time information is transmitted. The
information has been described in detail above with reference to
FIG. 109.
[1325] According to another embodiment of the present invention,
the first signaling information may include information about one
or more services transmitted through a single broadcast stream, and
the time information may be included in the service level of the
first signaling information to be used for synchronization between
all components in a single service. This has been described in
detail above with reference to FIGS. 112, 113 and 114.
[1326] FIG. 117 is a block diagram illustrating a configuration of
an apparatus for transmitting a broadcast signal according to an
embodiment of the present invention.
[1327] The apparatus L130010 for transmitting a broadcast signal
according to an embodiment of the present invention may include an
encoder L130020 for encoding a broadcast service, first signaling
information for fast acquisition of the broadcast service, second
signaling information for discovering the broadcast service and
third signaling information for a session in which the broadcast
service and components included in the broadcast service are
transmitted, a generation unit L130030 for generating a broadcast
signal including the encoded broadcast service, first signaling
information, second signaling information and third signaling
information and/or a transmission unit L130040 for transmitting the
broadcast signal. Here, the broadcast service may be an ATSC 3.0
service. The first signaling information may refer to the
aforementioned FIC and/or the SLT. The second signaling information
may refer to the aforementioned SMT, service description and/or
USD/USBD. The third signaling information may refer to the
aforementioned SMT, service description, LSID and/or S-TSID.
[1328] FIG. 118 is a block diagram illustrating a configuration of
an apparatus for receiving a broadcast signal according to an
embodiment of the present invention.
[1329] The apparatus L131010 for receiving a broadcast signal
according to an embodiment of the present invention may include a
reception unit L131020 for receiving a broadcast signal including a
broadcast service, first signaling information for fast acquisition
of the broadcast service, second signaling information for
discovering the broadcast service and third signaling information
for a session in which the broadcast service and components
included in the broadcast service are transmitted, an extraction
unit L131030 for extracting the broadcast service, the first
signaling information, the second signaling information and the
third signaling information from the received broadcast signal
and/or a decoder L131040 for decoding the extracted broadcast
service, first signaling information, second signaling information
and third signaling information. Here, the broadcast service may be
an ATSC 3.0 service. The first signaling information may refer to
the aforementioned FIC and/or the SLT. The second signaling
information may refer to the aforementioned SMT, service
description and/or USD/USBD. The third signaling information may
refer to the aforementioned SMT, service description, LSID and/or
S-TSID.
[1330] FIG. 119 illustrates service description information when
the session description information is delivered in service
description information according to an embodiment of the present
invention.
[1331] The present invention proposes a method of transmitting the
session description information through a path outside of a
transport session. The session description information may include
information such as transport characteristics, protocol and packet
structure of the corresponding transport session. According to an
embodiment, the session description information may correspond to
the aforementioned LSID. In addition, the session description
information may correspond to a plurality of LS elements in the
aforementioned S-TSID. In this case, the service description
information may correspond to the S-TSID.
[1332] The session description information may be delivered to the
receiver through the corresponding transport session or a path
outside of the transport session. The session description
information may be included in other signaling messages and
transmitted or transmitted through a path such as a service
signaling channel present inside/outside of the corresponding
transport session. When the session description information is
transmitted through the service signaling channel, the session
description information may be transmitted along with other
signaling messages.
[1333] A description will be given of a case in which the session
description information is transmitted included in other signaling
messages.
[1334] The session description information may be included in the
aforementioned signaling messages. The signaling messages may
include USBD, S-TSID, MPD, SMT and CMT. In the illustrated
embodiment, the session description information is included in the
service description information. Here, the service description
information may correspond to the aforementioned SMT and
S-TSID.
[1335] In this case, the session description information may be
included in the LSID element of the service description
information. The LSIS element may be a lower element of the ROUTE
session element of the service description information. The session
description information may include information of a ROUTE session
(transport session) indicated by the ROUTE session element. The
ROUTE session may be indicated by information of the ROUTE session
element, such as @sourceIPAddr, @destIPAddr and @destUDPPort. When
the session description information is directly included in the
service description information and transmitted in this manner, the
session description information may not be delivered in the
transport session described by the session description information
in order to prevent redundancy.
[1336] The elements of the service description information have
been described above.
[1337] @service_id indicates the identifier of the service
described by the service description information. @service_category
indicates the category of the service. @service_name indicates the
name of the service. @channel_number indicates a channel number
associated with the service. @service_status indicates status
information of the service. @service_distribution indicates
distribution related information about the service. @SP_indicator
indicates whether the service is protected. Here, if at least one
of service components of the service is protected, @SP_indicator
may indicate that the service is protected.
[1338] The ROUTE session element may include information about the
ROUTE session through which the service or service components are
delivered. A plurality of ROUTE session elements may be present in
the service description information. @sourceIPAddr, @destIPAddr and
@destUDPPort respectively indicate the source IP address,
destination IP address and destination UDP port number of an IP
datagram carrying corresponding ROUTE packets. That is, this
information may indicate the ROUTE session.
[1339] @LSID_DP specifies a DP (or PLP) through which the session
description information of the corresponding ROUTE session is
delivered. Here, the corresponding ROUTE session may refer to the
ROUTE session indicated by the source IP address, destination IP
address and destination UDP port number.
[1340] @LSIDInstanceID is the identifier of a session description
table delivering the session description information and specifies
a session description table having the session description
information of the corresponding ROUTE session. This field may be
used when the session description information is included in the
session description table and delivered. The session description
table may be transmitted along with other signaling messages
through a service signaling channel.
[1341] @LSIDurl may include URL information for identifying the
location of the session description information of the
corresponding ROUTE session when the session description
information is transmitted through a broadband network. This field
may be used when the session description information is transmitted
through the broadband network.
[1342] Targeting field indicates the targeting parameter of the
service. That is, this field may specify whether the corresponding
service is a service for the receiver or a companion device. A
Content Advisory field may include content advisory information
about the service, that is, information about rating of the
service. Right Issuer Service may include information about rights
issues associated with the service. Current Program may include
information about the current program. Original Service
Identification may include identification information about the
original service. Content Labeling may include content labeling
information of the service. Genre may include information on the
genre of the service. Caption may include information about
captioning of the service. Protection may include information about
protection of the service.
[1343] While the case in which the transport session is a ROUTE
session has been described, the present invention is not limited
thereto. That is, the embodiments may be equally applied to other
transport sessions such as MMTP sessions.
[1344] FIG. 120 illustrates message formats for session description
information delivery when the session description information is
delivered through a service signaling channel according to an
embodiment of the present invention.
[1345] As described above, the session description information may
be delivered through a path such as a service signaling channel. In
this case, the session description information may be delivered
along with other signaling messages. The service signaling channel
may be delivered through a separate transport session or through a
sub-session of the corresponding transport session such as a ROUTE
session according to an embodiment.
[1346] When a single service is divided into a plurality of
transport sessions and delivered therethrough, description
information about the plurality of transport sessions may be
necessary. In this case, session description information about each
transport session may be transmitted through a service signaling
channel. Here, session description may need to be mapped to each
transport session. For mapping, the aforementioned @LSIDInstanceID
information may be used. Session description information about
ROUTE sessions indicated by service description information may be
acquired using the @LSIDInstanceID information. This may be
performed by identifying a session description table mapped to the
corresponding information. The aforementioned mapping may not be
necessary when session description information is included in the
service description information and transmitted.
[1347] According to an embodiment, a service signaling channel may
refer to an LCT session in a ROUTE session through which SLS is
transmitted. The LCT session may be specified such that the LCT
session has TSI=0, as described above.
[1348] An embodiment t2010 illustrated in the figure may be a
message format having an extended structure for session description
information transmission on the basis of the aforementioned
signaling message format. For session description information
transmission, a signaling_id extension field may be divided into
LSIDT_protocol_version and LSIDT_instance_ID and defined.
[1349] The LSIDT_protocol_version field indicates the version or
protocol version of the corresponding session description table.
The LSIDT_instance_ID field indicates the identifier of session
description information transmitted through the corresponding table
and may have a value corresponding to @LSIDInstanceID included in
the aforementioned service description information. Accordingly,
the ROUTE session may be mapped to the session description
information. LCT_session_instance_description( ) may include the
session description information in binary or XML format. That is,
data of the session description information may be included in
LCT_session_instance_description( ). Other information of the
session description table may correspond to those described in the
aforementioned signaling message format.
[1350] Another embodiment t2020 illustrated in the figure describes
another session description table for session description
information delivery. In the present embodiment, the session
description table may have an MPEG-2 TS private section based field
configuration. LSIDT_protocol_version, LSIDT_instance_ID and
LCT_session_instance_description( ) may correspond to those in the
aforementioned embodiment. Other information of the session
description table may correspond to those described in the
aforementioned signaling message format.
[1351] FIG. 121 illustrates a method of transmitting session
description information through a path outside of a session
according to an embodiment of the present invention.
[1352] In the present embodiment, a single service may be
transmitted through two ROUTE sessions. Session description
information of the first ROUTE session may be transmitted through
the corresponding ROUTE session (first ROUTE session) and session
description information of the second ROUTE session may be
transmitted through a service signaling channel corresponding to a
path outside of the second ROUTE session. Here, the service
signaling channel may be located inside of the first ROUTE
session.
[1353] A description will be given of a procedure of acquiring each
signaling message and/or service component data in the present
embodiment.
[1354] The receiver may acquire bootstrap information of the
service signaling channel from an FIC. The receiver may access the
service signaling channel using the bootstrap information. The
receiver may access the service signaling channel using IP address
and UDP port information of the FIC. According to an embodiment,
TSI information and/or PLP ID information may be needed. This
operation may correspond to the aforementioned operation of
accessing the SLS using the SLT. In this case, the SLT corresponds
to the FIC, the LCT session carrying the SLS corresponds to the
service signaling channel and the SLS corresponds to information
included in the service signaling channel. While the FIC is
delivered through a separate channel of a physical signal frame in
the present embodiment, the SLT may be encapsulated through IP/UDP
and delivered through a PLP.
[1355] Information of the SMT may be acquired from the service
signaling channel accessed using the bootstrap information. The
session description information about each ROUTE session may be
acquired from the SMT. The session description information about
the first ROUTE session may be acquired using the @LSID_DP
information. The session description information about the first
ROUTE session may be acquired by accessing the PLP indicated by
@LSID_DP. The session description information about the second
ROUTE session may be acquired using the @LSIDT_instance_ID
information. The session description information about the second
ROUTE session may be acquired by identifying the session
description table indicated by @LSIDT_instance_ID.
[1356] This process may correspond to the process of accessing the
LCT session of the ROUTE session carrying the SLS to acquire
information of the SLS in the aforementioned embodiment. The
session description information, that is, information about
sub-sessions (LCT sessions) of the ROUTE sessions, through which
service components are delivered, may be acquired from the
information of the SLS. Information about LS elements in the S-TSID
of the SLS may correspond to the session description information.
In this case, a separate session description table may not be
needed. In addition, since the session description information is
included in the SLS and delivered, the session description
information is transmitted through the same PLP as the SLS.
Accordingly, PLP ID information about the PLP through which the
session description information is delivered may not be needed.
[1357] Subsequently, the PLP IDs of the service component may be
acquired from the CMT. TSI information of the first and second
ROUTE sessions may be acquired using the obtained session
description information. The TSI information may be TSI information
of the LCT session carrying the service components. The service
components may be acquired using the TSI information. In addition,
representation IDs of the service components may be acquired from
the MPD.
[1358] This process may correspond to the process of accessing LCT
sessions to acquire service components using the information (TSI,
etc.) in the SLS in the aforementioned embodiment. In this case,
the S-TSID may include PLP ID information, and thus an additional
CMT may not be needed. A plurality of LCT sessions in the plurality
of ROUTE sessions may be respectively accessed using the session
description information in the S-TSID. For the acquired service
components, representation IDs may be obtained from the MPD.
[1359] FIG. 122 illustrates a method of transmitting session
description information through a path outside of a transport
session according to another embodiment of the present
invention.
[1360] In the present embodiment, a single service may be
transmitted through two ROUTE sessions. Both session description
information of the first ROUTE session and session description
information of the second ROUTE session may be transmitted through
a service signaling channel delivered through the first ROUTE
session.
[1361] In the present embodiment, a procedure of acquiring each
signaling message and/or service component data corresponds to that
of the aforementioned embodiment. In the present invention,
however, both the session description information of the first
ROUTE session and the session description information of second
ROUTE session are delivered through session description tables.
Accordingly, two session description tables indicated by
@LSIDT_instance_ID may be obtained first and then service
components delivered through the two ROUTE sessions may be accessed
using the session description information in the tables.
[1362] The present embodiment corresponds to the aforementioned
embodiment using the SLT-SLS. When a channel/path through which the
SLS is delivered is accessed using the SLT, a path through which
service components of the corresponding service are delivered may
be accessed using information included in the SLS. In this case,
the service component delivery path may be present over the
plurality of ROUTE sessions, and the service components may be
delivered through a plurality of LCT sessions in the plurality of
ROUTE sessions.
[1363] FIG. 123 illustrates a method of transmitting session
description information through a path outside of a transport
session according to another embodiment of the present
invention.
[1364] In the present embodiment, a single service may be
transmitted through two ROUTE sessions. Both session description
information of the first ROUTE session and session description
information of the second ROUTE session may be transmitted through
a service signaling channel delivered through the first ROUTE
session.
[1365] In the present embodiment, a procedure of acquiring each
signaling message and/or service component data corresponds to that
of the aforementioned embodiment. In the present invention,
however, the service signaling channel may be delivered through a
separate channel identified by a separate PLP (DP), IP and UDP
rather than being delivered through a single LCT session of a
specific ROUTE session. In this case, the session description
information about the ROUTE sessions is delivered through the
outside path, and thus the service signaling channel may have
session description tables for the respective sessions. Service
components delivered through the two ROUTE sessions may be accessed
using the session description information included in the session
description tables.
[1366] In this case, since the service signaling channel is not
delivered through a single sub-session (LCT session) of a specific
ROUTE session, bootstrap information of the FIC or SLT may not
include TSI information.
[1367] FIG. 124 illustrates ESG bootstrap information according to
an embodiment of the present invention.
[1368] An embodiment of the present invention may provide a method
of signaling ESG bootstrapping description available in the future
broadcast network. The ESG bootstrapping description includes the
following information and may be defined in binary or XML format
according to signaling transport location.
[1369] Electronic Service Guide (ESG) data may include a Service
Guide Delivery Unit (SGDU) and/or a Service Guide Delivery
Descriptor (SGDD). The SGDD may include information indicating a
delivery path through which the SGDU is transmitted. The SGDU may
include information associated with services and/or programs. For
example, the SGDU may include service information, program
information, channel numbers, broadcasting station information,
caption, rating and/or summary. The service information may include
the name and/or the identifier of a service. The program
information may include the name and/or the identifier of a
program, program start time information and/or program close time
information. The SGDU is configured per fragment. Fragment type may
include at least one of a service fragment, a content fragment and
a schedule fragment. Both the SGDD and the SGDU may be XML files.
The ESG may be represented as a Service Guide (SG) and/or an
Electronic Program Guide (EPG). The ESG data may be simply
represented as ESG.
[1370] The ESG bootstrapping description may include information
for bootstrapping of the ESG. The ESG bootstrapping description may
be represented by ESG bootstrap information and/or bootstrapping
information for the ESG. The broadcast reception apparatus may
receive, acquire and/or process the ESG on the basis of the ESG
bootstrapping description and/or the ESG bootstrap information.
[1371] The ESG bootstrapping description may include at least one
Service Guide (SG) Provider element.
[1372] An SG provider may refer to a provider providing information
related to the ESG. The SG provider element may include a name
attribute and/or at least one bootstrap element.
[1373] The name attribute may indicate the name of the SG
provider.
[1374] The bootstrap element may include at least one piece of
bootstrap information. The bootstrap element may include a
network_type attribute, a sourceIPAddr element, a destIPAddr
element, a destUDPPort element, a transportStreamID element, a
partitionID element, a datapipeID element, a tsi element and/or a
downloadURL element. For example, the bootstrap element may be ESG
bootstrap information.
[1375] The network_type element may indicate an ESG data
transmission type. Specifically, the network_type element may
indicate an SGDD transmission type. One network_type attribute may
be included in the bootstrap element. The bootstrap element may
selectively include bootstrap information defined below according
to the value of the network type attribute. For reference, "ESG
bootstrapping description transmission type" may be interpreted as
"ESG data transmission type". Specifically, "ESG bootstrapping
description transmission type" may be interpreted as "SGDD
transmission type".
[1376] The sourceIPAddr element may indicate the source ID
addresses of the ESG data and/or SG data. For example, the
sourceIPAddr element may include the IP source addresses of packets
carrying service layer signaling information for a service and/or
ESG. Specifically, the sourceIPAddr element may indicate the IP
source address corresponding to the SGDD.
[1377] The destIPAddr element may indicate the destination IP
address of the ESG data and/or SG data. For example, the destIPAddr
element may include the IP destination addresses of packets
carrying service layer signaling information for a service and/or
ESG. Specifically, the destIPAddr element may indicate the IP
destination address corresponding to the SGDD.
[1378] The destUDPPort element may indicate the destination port
number of the ESG data and/or SG data. For example, the destUDPPort
element may include the port number of packets carrying service
layer signaling information for a service and/or ESG. Specifically,
the destUDPPort element may indicate the destination port number
corresponding to the SGDD.
[1379] The sourceIPAddr element, the destIPAddr element and/or the
destUDPPort element refer to information described in the header of
the IP packet carrying the ESG data.
[1380] The transportStreamID element may indicate the transport
stream identifier corresponding to a foreign frequency when the ESG
data is transmitted through the foreign Frequency. This value may
be selectively included in the bootstrap element according to the
value of the network_type attribute. Specifically, the
transportStreamID element may indicate the transport stream
identifier corresponding to the transport stream carrying the
SGDD.
[1381] The partitionID element may indicate the partition
identifier corresponding to a foreign frequency when the ESG data
is transmitted through the foreign Frequency. For example, the
partition identifier identifies a broadcaster. This value may be
selectively included in the bootstrap element according to the
value of the network_type attribute. Specifically, the partitionID
element may indicate the partition identifier corresponding to the
SGDD.
[1382] The datapipeID element may indicate the identifier
identifying a PLP and/or a DP through which the ESG data is
transmitted. This value may be selectively included in the
bootstrap element according to the value of the network_type
attribute. For example, when the ESG data is transmitted through a
broadcast network, the datapipeID element may have a single value.
Specifically, the datapipeID element may indicate the identifier
identifying the PLP and/or DP through which the SGDD is
transmitted.
[1383] To signal information of the ESG data transmitted through
the foreign frequency, the bootstrap element may selectively
include the transportStreamID element, the partitionID element
and/or the datapipeID element.
[1384] The tsi element may indicate the identifier identifying the
transport session and/or an LCT session through which the ESG data
is transmitted. This value may be selectively included in the
bootstrap element according to the value of the network_type
attribute. For example, when the ESG data is transmitted through a
broadcast network, the tsi element may include at least one value.
Specifically, the tsi element may indicate the identifier
identifying the transport session and/or an LCT session through
which the SGDD is transmitted.
[1385] The downloadURL element may indicate the URL by which the
ESG data transmitted through a broadband network may be accessed.
This value may be selectively included in the bootstrap element
according to the value of the network_type attribute. For example,
when the ESG data is transmitted through a broadband network, the
downloadURL element may have a single value. Specifically, the
downloadURL element may indicate the URL corresponding to the
SGDD.
[1386] The bootstrap element may include at least one of the tsi
element and the downloadURL element according to whether the ESG
data is transmitted through the broadcast network or the broadband
network.
[1387] The broadcast transmission apparatus may transmit a
broadcast signal including service data and signaling information.
The signaling information may include ESG bootstrap information.
The broadcast reception apparatus may receive the broadcast signal
including the service data and the signaling information. The
broadcast reception apparatus may acquire and/or process ESG data
on the basis of ESG bootstrap information included in the signaling
information.
[1388] FIG. 125 illustrates ESG bootstrap information transmission
types according to an embodiment of the present invention.
[1389] The network type attribute may indicate an ESG data
transmission type. The value of the network_type attribute may be
variable. When the ESG data is transmitted in multiple types, a
plurality of bootstrap elements having network_type attribute
values respectively corresponding to the types may be
transmitted.
[1390] When the network_type attribute has a value of "0x01", the
ESG data is transmitted through ATSC3.0 broadcast at the same
frequency. In this case, the broadcast reception apparatus may
receive the ESG data at the same frequency.
[1391] When the network_type attribute has a value of "0x02", the
ESG data is transmitted through the ATSC3.0 broadcast at a
different frequency. In this case, the broadcast reception
apparatus may receive the ESG data at the different frequency.
[1392] When the network_type attribute has a value of "0x03", the
ESG data is transmitted through IP broadcast other than the ATSC3.0
broadcast. In this case, the broadcast reception apparatus may
receive the ESG data through the IP broadcast.
[1393] When the network_type attribute has a value of "0x04", the
ESG data is transmitted through a broadband network. In this case,
the broadcast reception apparatus may receive the ESG data through
the broadband network.
[1394] FIG. 126 illustrates signaling of the ESG bootstrap
information according to a first embodiment of the present
invention.
[1395] The first embodiment of the present invention may provide a
method of transmitting the ESG bootstrap information in the form of
an ESG bootstrapping descriptor of a fast information channel (FIC)
in the future broadcast network. In the first embodiment of the
present invention, the ESG is not defined as a broadcast service.
The FIC may refer to the Service List Table (SLT). The SLT is a
signaling information table used to build a basic service list and
to bootstrap discovery of service layer signaling information
(SLS).
[1396] Referring to the figure, a broadcast signal and/or an actual
stream may include at least one broadcast stream at a specific
frequency. For example, the actual stream may include a broadcast
stream having a frequency of "Frqncy-z".
[1397] Each broadcast stream may include at least one partition.
Each partition may correspond to each broadcaster. Otherwise, each
partition may be a broadcast stream transmitted from each
broadcaster.
[1398] Each partition may include at least one DL (or PLP) and/or
an FIC. For example, a first partition A may include a first DP, a
second DP, a third DP and/or the FIC. The DP ID of the first DP may
be "1". The DP ID of the second DP may be "2". The DP ID of the
third DP may be "3".
[1399] A single DP may include a single Real-Time Object Delivery
over Unidirectional Transport (ROUTE) session. A plurality of DPs
may include a single ROUTE session. A ROUTE session may include at
least one service and/or at least one component. The ROUTE session
may include IP/UDP datagrams.
[1400] For example, the first DL may include a first ROUTE session.
That is, the first ROUTE session is transmitted through the first
DP. The first ROUTE session may be specified by a first source IP
address, a first destination IP address and/or a first UDP Port
number. The first ROUTE session may include a first service (A/V
service).
[1401] The first ROUTE session may include at least one transport
session (or LCT session). For example, the first ROUTE session may
include a first transport session (tsi-v), a second transport
session (tsi-a), a third transport session (tsi-s) and/or a fourth
transport session (tsi-0).
[1402] The first transport session (tsi-v) may include a video
component. The video component may include at least one video
segment including video data. The second transport session (tsi-a)
may include an audio component. The audio component may include at
least one audio segment including audio data. The third transport
session (tsi-s) may include a service signaling channel component.
The service signaling channel component may include a Service Map
Table (SMT), a Component Mapping Table (CMT), a Guide Access Table
(GAT) and/or a DASH Media Presentation Description (MPD). The
fourth transport session (tsi-0) may include an LCT session
instance description (LSID). The LSID may be referred to as a
Service-based Transport Session Instance Description (S-TSID). The
S-TSID may include whole session description information for at
least one transport session through which at least one content
component of a service is transmitted.
[1403] The second DP and the third DP may include a second ROUTE
session. That is, the second ROUTE session is transmitted through
the second DP and/or the third DP. The second ROUTE session may be
specified by a second source IP address, a second destination IP
address and/or a second UDP Port number.
[1404] The second ROUTE session may include at least one transport
session (or LCT session). For example, the second ROUTE session may
include a fifth transport session (tsi-0), a sixth transport
session (tsi-101) and/or a seventh transport session (tsi-102). A
transport session (or LCT session) may include at least one
transport object.
[1405] The fifth transport session (tsi-0) may include an LSID.
[1406] The sixth transport session (tsi-101) may include a first
transport object (toi-0) and/or a second transport object (toi-1).
The first transport object (toi-0) may include a File Delivery
Table (FDT) providing files transmitted in a file delivery session
and/or attributes associated with file delivery. Otherwise, the
first transport object (toi-0) may include an EFDT which specifies
details of file delivery data. The second transport object (toi-1)
may include Service Guide Delivery Descriptor (SGDD) which
describes information about a delivery path through which a Service
Guide Delivery Unit (SGDU) is delivered.
[1407] The seventh transport session (toi-102) may include a third
transport object (toi-0), a fourth transport object (toi-1) and/or
a fifth transport object (toi-2). The third transport object
(toi-0) may include an FDT and/or an EFDT. The fourth transport
object (toi-1) may include an SGDU. The fifth transport object
(toi-2) may include an SGDU. The SGDU is configured per fragment,
and fragment type may include at least one of a service fragment, a
content fragment and a schedule fragment. The SGDU may include ESG
data. Both the SGDD and the SGDU may be XML files.
[1408] The broadcast transmission apparatus may transmit a
broadcast signal including service data and signaling information.
For example, the signaling information may include an FIC and/or an
LSID.
[1409] The broadcast transmission apparatus may transmit a
broadcast signal including the FIC.
[1410] The FIC may include at least one PartitionID element that
specifies a partition, a ServiceID element that specifies a
service, a Service Category element that indicates the category of
the service, an SSC IP/Port element that specifies an IP
address/port through which an SSC is transmitted, an SSC DP_ID
element that specifies a DP through which the SSC is transmitted, a
TSI element that specifies a transport session through which the
SSC is transmitted and/or a partition level descriptor.
[1411] The SSC bootstrap information (SSC IP/Port element, SSC
DP_ID element and/or TSI element) may include information related
to the service signaling channel (SSC) through which the SMT and/or
the CMT are transmitted. Since the ESG is not defined as a single
service in the first embodiment of the present invention, the FIC
may not include the SSC bootstrap information in a service
loop.
[1412] The FIC according to the first embodiment of the present
invention may include the ESG bootstrap information in the form of
a partition level descriptor.
[1413] The ESG bootstrap information may include the same
information as the aforementioned ESG bootstrap information and/or
ESG bootstrapping description. For example, the ESG bootstrap
information may include the num_of_Provider element and/or at least
one provider element.
[1414] The num_of_Provider element indicates the number of
providers.
[1415] The provider element may include information about a
provider. For example, the provider element may include the ESG
bootstrap information. In addition, the provider element may
include ESG data and/or information about a provider providing ESG
related information. The provider element may indicate the
aforementioned SG provider element. Each provider element may
include a bootstrap_network_type attribute, a ts_ID attribute, a
partitionID attribute, a Route_session element, a tsi attribute, a
DP attribute and/or a URL attribute.
[1416] The bootstrap_network_type attribute indicates ESG data
transmission type. The bootstrap_network_type attribute may
indicate the aforementioned network_type attribute.
[1417] The ts_ID attribute indicates the transport stream ID of a
foreign frequency when the ESG data is transmitted through the
foreign frequency. The ts_ID attribute may indicate the
aforementioned transportStreamID element.
[1418] The partitionID attribute indicates the partition ID of a
foreign frequency when the ESG data is transmitted through the
foreign frequency. The partitionID attribute may indicate the
aforementioned partitionID element.
[1419] The ROUTE_session element may include information specifying
a ROUTE session. The Route_session element may include ROUTE
session bootstrap information. The ROUTE session bootstrap
information may include transport path of the ROUTE session. For
example, the Route_session element may include an IP(src/dest)
attribute and/or a port attribute. The IP(src/dest) attribute may
include the aforementioned sourceIPAddr element and destIPAddr
element. The port attribute may indicate the aforementioned
destUDPPort element. A combination of the sourceIPAddr element,
destIPAddr element and port element may specify a specific ROUTE
session.
[1420] The tsi attribute may indicate the identifier identifying a
transport session and/or an LCT session through which the ESG data
is transmitted. For example, the tsi attribute may indicate the
identifier identifying a transport session and/or an LCT session
through which the SGDD is transmitted. Referring to the figure, the
tsi attribute may have a value of "tsi-101", for example.
[1421] The DP attribute may specify a PLP and/or a DP through which
the ESG data is transmitted. The DP attribute may indicate the
aforementioned datapipeID element. For example, the DP attribute
may indicate a PLP and/or a DP through which the SGDD is
transmitted. Referring to the figure, the DP attribute may have a
value of "2", for example.
[1422] The URL attribute may specify a URL by which the ESG data
may be accessed. The URL attribute may indicate the aforementioned
downloadURL element.
[1423] The FIC according to an embodiment of the present invention
may be transmitted in an IP/UDP packet.
[1424] The broadcast transmission apparatus may transmit a
broadcast signal including LSID.
[1425] For example, the LSID included in the fifth transport
session (tsi-0) may include a sixth transport session element
TSI-101 containing information about the sixth transport session
and/or a seventh transport session element TSI-102 containing
information about the seventh transport session.
[1426] Each of the sixth transport session element TSI-101 and the
seventh transport session element TSI-102 may include a DP
attribute that specifies a DP through which the corresponding
transport session is transmitted, a SourceFlow element that
provides information about a source flow included in the transport
session and/or a RepairFlow element that provide information about
a repair flow included in the transport session. The SourceFlow
element may include a realtime attribute that indicates whether the
SourceFlow element carries streaming media data. For example, when
the realtime attribute is "true", the realtime attribute indicates
real-time transmission of the SourceFlow element. When the realtime
attribute is "false", the realtime attribute indicates non-real
time transmission of the SourceFlow element.
[1427] While the broadcast reception apparatus may acquire the
seventh transport session element TSI-102 through the SGDD, the
broadcast reception apparatus may not acquire information about the
DP corresponding to the SGDU transmitted through the corresponding
transport session. Accordingly, the broadcast transmission
apparatus according to the first embodiment may transmit LSID
including DP information.
[1428] The broadcast reception apparatus may receive a broadcast
signal including service data and signaling information. The
signaling information may include an FIC and/or LSID.
[1429] The broadcast reception apparatus may acquire the FIC. The
FIC may be transmitted through an IP/UDP packet.
[1430] The broadcast reception apparatus may acquire ESG bootstrap
information and/or LSID on the basis of the FIC. The broadcast
reception apparatus may acquire the ESG bootstrap information on
the basis of the partition level descriptor of the FIC. The ESG
bootstrap information may be included in the FIC in the form of the
partition level descriptor. Since ESG is not defined as a single
service in the first embodiment of the present invention, the FIC
may not include SSC bootstrap information in the service loop. The
LSID may include transport data pipeline information (or PLP ID)
per transport session. The broadcast reception apparatus may
acquire the LSID on the basis of ROUTE session bootstrap
information included in the ESG bootstrap information. In this
case, the LSID may be transmitted through a predetermined transport
session, and the broadcast reception apparatus may acquire the LSID
on the basis of the ROUTE session bootstrap information and/or
information on the predetermined transport session. Alternatively,
the broadcast reception apparatus may acquire the LSID on the basis
of additional LSID transport path information included in the
FIC.
[1431] The broadcast reception apparatus may acquire ESG data
and/or an ESG service on the basis of the ESG bootstrap information
and/or the LSID.
[1432] To acquire ESG Announcement Channel information and transmit
(or deliver) ESG data, the broadcast transmission apparatus
according to the first embodiment of the present invention may add
transport data pipeline information (or PLP ID) per transport
session in the LSID. Consequently, the broadcast transmission
apparatus may transmit an SGDU. The broadcast reception apparatus
may receive the LSID including the data pipeline information (or
PLP ID) per transport session and acquire the SGDU on the basis of
the LSID.
[1433] In addition, the broadcast transmission apparatus according
to the first embodiment of the present invention may add ATSC 3.0
Profile to the syntax of the SGDD to add data pipeline information.
In this case, the broadcast reception apparatus may receive SGDD
and acquire the SGDU on the basis of the data pipeline information
of the SGDD.
[1434] FIG. 127 illustrates signaling of ESG bootstrap information
according to a second embodiment of the present invention.
[1435] The second embodiment of the present invention provides a
method for transmitting the ESG bootstrap information in the form
of an ESG bootstrapping descriptor of an FIC in the future
broadcast network. In the second embodiment of the present
invention, the ESG may be defined as a single broadcast service. In
addition, the Service Category element may indicate that the
corresponding service is ESG service in the service loop of the
FIC. The broadcast reception apparatus may receive ESG bootstrap
information in the form of an ESG bootstrapping descriptor in the
FIC. In addition, the broadcast reception apparatus may acquire ESG
through the ESG bootstrap information.
[1436] Referring to the figure, an actual stream according to the
second embodiment of the present invention may include a broadcast
stream having a frequency of "Frqncy-z". The broadcast stream
according to an embodiment of the present invention may include a
first partition A. The first partition A may include a first DP, a
second DP, a third DP and/or the FIC. The first DP may include a
first ROUTE session. The first ROUTE session may include a first
service (A/V service). The first ROUTE session may include a first
transport session (tsi-v), a second transport session (tsi-a), a
third transport session (tsi-s) and/or a fourth transport session
(tsi-0). The second DP and the third DP may include a second ROUTE
session. The second ROUTE session may include a second service. For
example, the second service may include an ESG service. The second
ROUTE session may include a fifth transport session (tsi-0), a
sixth transport session (tsi-101) and/or a seventh transport
session (tsi-102). The FIC according to the second embodiment of
the present invention may be included in an IP/UDP packet and
transmitted. The actual stream illustrated in the figure may
correspond to the aforementioned actual stream.
[1437] The broadcast transmission apparatus may transmit a
broadcast signal including service data and signaling information.
For example, the service data may include ESG data. The signaling
information may include an FIC and/or an LSID.
[1438] The broadcast transmission apparatus may transmit a
broadcast signal including the FIC.
[1439] The FIC may include at least one PartitionID element that
specifies a partition, a ServiceID element that specifies a
service, a Service Category element that indicates the category of
the service, an SSC IP/Port element that specifies an IP
address/port through which an SSC is transmitted, an SSC DP_ID
element that specifies a DP through which the SSC is transmitted, a
TSI element that specifies a transport session through which the
SSC is transmitted and/or a partition level descriptor. The SSC
IP/Port element may include a source IP Address, a destination IP
Address and/or a UDP Port number corresponding to the SSC.
[1440] A transport session through which an SGDD is transmitted may
differ from a transport session through which LSID is transmitted.
In this case, SSC bootstrap information (SSC IP/Port element, SSC
DP_ID element and/or TSI element) may be replaced by ESG
bootstrapping information. For example, the SSC IP/Port element,
SSC DP_ID element and/or TSI element may be ESG bootstrap
information that specifies ESG data transmitted through ATSC3.0
Broadcast at the same frequency. In this case, the SSC IP/Port
element, SSC DP_ID element and/or TSI element may not include
information related to the SSC. Information indicating that the SSC
IP/Port element, SSC DP_ID element and/or TSI element include the
ESG bootstrap information may be included in semantics of the FIC.
The ESG bootstrap information may be information that specifies a
path through which ESG data and/or SGDD are transmitted. The FIC
may additionally include bootstrap information and/or transport
path information about the SSC and/or LSID. In addition, the SSC
and/or LSID may be transmitted through a predetermined specific
transport session.
[1441] The transport session through which the SGDD is transmitted
may be identical to the transport session through which the LSID is
transmitted. That is, the LSID may include the SGDD. In this case,
the SSC bootstrap information may correspond to the ESG bootstrap
information. That is, the SSC bootstrap information and/or the ESG
bootstrapping information may specify the SSC, LSID, ESG data
and/or SGDD. For example, the SSC IP/Port element may specify
IP/Ports through which the SSC, LSID, ESG data and/or SGDD are
transmitted. The SSC DP_ID element may specify a DP through which
the SSC, LSID, ESG data and/or SGDD are transmitted. The TSI
element may specify a transport session through which the SSC,
LSID, ESG data and/or SGDD are transmitted. The SSC IP/Port element
may include source IP Addresses, destination IP Addresses and/or
UDP Port numbers associated with transmission of the SSC, LSID, ESG
data and/or SGDD. In this case, the SSC and/or LSID may be
transmitted through a predetermined specific transport session.
[1442] The partition level descriptor of the FIC may further
include additional ESG bootstrap information. For example, the ESG
bootstrap information included in the partition level descriptor
may include a num_of_Provider element and/or at least one provider
element. For example, the provider element may include information
about a provider. In addition, the provider element may include
information about a provider providing information about ESG data
and/or ESG. The provider element may include a
bootstrap_network_type attribute, a ts_ID attribute, a partitionID
attribute, a Service ID attribute and/or a URL attribute. The
Service ID attribute specifies a service. The elements and
attributes included in the ESG bootstrap information correspond to
the aforementioned ones.
[1443] The ESG according to the second embodiment of the present
invention may be defined as a single service. The SSC bootstrap
information in the FIC service loop may be used as ESG bootstrap
information.
[1444] Accordingly, while an additional definition scheme is needed
when semantics of the SSC bootstrap information in the FIC service
loop are defined, FIC size increase may be reduced by the length of
the information. ESG bootstrap information, which is transmitted
through a network type that cannot be represented using the SSC
bootstrap information, is transmitted through the partition level
descriptor.
[1445] The Service Category element according to the second
embodiment of the present invention may indicate an ESG
service.
[1446] The broadcast transmission apparatus may transmit a
broadcast signal including LSID.
[1447] For example, the LSID included in the fifth transport
session (tsi-0) may include a sixth transport session element
TSI-101 containing information about the sixth transport session
and/or a seventh transport session element TSI-102 containing
information about the seventh transport session. The LSID according
to the second embodiment of the present invention may correspond to
the aforementioned LSID.
[1448] While the broadcast reception apparatus may acquire the
seventh transport session element TSI-102 through the SGDD, the
broadcast reception apparatus may not acquire information about the
DP corresponding to the SGDU transmitted through the corresponding
transport session. Accordingly, the broadcast transmission
apparatus according to the first embodiment may transmit LSID
including DP information.
[1449] The broadcast reception apparatus may receive a broadcast
signal including service data and signaling information. For
example, the service data may include ESG data. The signaling
information may include an FIC and/or LSID.
[1450] The broadcast reception apparatus may acquire the FIC. The
FIC may be transmitted through an IP/UDP packet.
[1451] The broadcast reception apparatus may acquire SSC bootstrap
information and/or ESG bootstrap information on the basis of the
FIC. The FIC may include the ESG bootstrap information.
[1452] When a transport session through which an SGDD is
transmitted differs from a transport session through which LSID is
transmitted, SSC bootstrap information (SSC IP/Port element, SSC
DP_ID element and/or TSI element) of the FIC may be replaced by ESG
bootstrapping information. The FIC may further include additional
information for bootstrapping and/or identifying the SSC and/or
LSID.
[1453] When the transport session through which the SGDD is
transmitted is identical to the transport session through which the
LSID is transmitted, the SSC bootstrap information may correspond
to the ESG bootstrap information. That is, the SSC bootstrap
information and/or the ESG bootstrapping information may specify
the SSC, LSID, ESG data and/or SGDD. The following description is
based on a case in which the transport session through which the
SGDD is transmitted is identical to the transport session through
which the LSID is transmitted
[1454] The partition level descriptor of the FIC may further
include additional ESG bootstrap information. The LSID may include
transport data pipeline information (or PLP ID) per transport
session.
[1455] The broadcast reception apparatus may acquire the LSID on
the basis of the FIC. For example, the broadcast reception
apparatus may acquire the LSID on the basis of the SSC bootstrap
information included in the FIC.
[1456] The broadcast reception apparatus may acquire the ESG
bootstrap information on the basis of the FIC. For example, the SSC
bootstrap information may correspond to the ESG bootstrap
information.
[1457] The broadcast reception apparatus may acquire ESG data
and/or ESG service on the basis of the ESG bootstrap information
and/or the LSID.
[1458] To acquire ESG Announcement Channel information and transmit
(or deliver) ESG data, the broadcast transmission apparatus
according to the second embodiment of the present invention may add
transport data pipeline information (or PLP ID) per transport
session in the LSID. Consequently, the broadcast transmission
apparatus may transmit an SGDU. The broadcast reception apparatus
may receive the LSID including the data pipeline information (or
PLP ID) per transport session and acquire the SGDU on the basis of
the LSID.
[1459] In addition, the broadcast transmission apparatus according
to the second embodiment of the present invention may add ATSC 3.0
Profile to the syntax of the SGDD to add data pipeline information.
In this case, the broadcast reception apparatus may receive SGDD
and acquire the SGDU on the basis of the data pipeline information
of the SGDD.
[1460] FIG. 128 illustrates signaling of ESG bootstrapping
description according to a third embodiment of the present
invention.
[1461] The third embodiment of the present invention provides a
method for transmitting the ESG bootstrap information using the
ROUTE session element of the SMT in the future broadcast system.
The ESG may be defined as a separate broadcast service. The Service
Category element may indicate ESG service in the service loop of
the FIC. The SMT and the CMT may be transmitted through the SSC.
However, definition of the SMT semantics needs to be modified.
[1462] Referring to the figure, an actual stream according to the
third embodiment of the present invention may include a broadcast
stream having a frequency of "Frqncy-z". The broadcast stream
according to an embodiment of the present invention may include a
first partition A. The first partition A may include a first DP, a
second DP, a third DP, a fourth DP and/or the FIC. The first DL may
include a first ROUTE session. The first ROUTE session may include
a first service (A/V service). The first ROUTE session may include
a first transport session (tsi-v), a second transport session
(tsi-a), a third transport session (tsi-s) and/or a fourth
transport session (tsi-0). The first ROUTE session illustrated in
the figure may correspond to the aforementioned ROUTE session.
[1463] The second DP, the third DP and the fourth DP may include a
second ROUTE session. The second ROUTE session may include a second
service. For example, the second service may include an ESG
service. The second ROUTE session may include a fifth transport
session (tsi-0), a sixth transport session (tsi-ssc), a seventh
transport session (tsi-101) and/or an eighth transport session
(tsi-102).
[1464] The fifth transport session (tsi-0) may include an LSID.
[1465] The sixth transport session (tsi-ssc) may include an SMT
and/or a component mapping table (CMT).
[1466] The seventh transport session (tsi-101) may include a first
transport object (toi-0) and/or a second transport object (toi-1).
The first transport object (toi-0) may include an FDT and/or an
EFDT. The second transport object (toi-1) may include an SGDD.
[1467] The eighth transport session (toi-102) may include a third
transport object (toi-0), a fourth transport object (toi-1) and/or
a fifth transport object (toi-2). The third transport object
(toi-0) may include an FDT and/or an EFDT. The fourth transport
object (toi-1) may include an SGDU. The fifth transport object may
include an SGDU. The SGDU may include ESG data.
[1468] The broadcast transmission apparatus may transmit a
broadcast signal including service data and signaling information.
For example, the service data may include ESG data and the
signaling information may include an FIC, SMT, CMT and/or LSID.
[1469] The broadcast transmission apparatus may transmit a
broadcast signal including the FIC.
[1470] The FIC may include at least one PartitionID element that
specifies a partition, a ServiceID element that specifies a
service, a Service Category element that indicates the category of
the service, an SSC IP/Port element that specifies an IP
address/port through which an SSC is transmitted, an SSC DP_ID
element that specifies a DP through which the SSC is transmitted, a
TSI element that specifies a transport session through which the
SSC is transmitted and/or a partition level descriptor.
[1471] The SSC IP/Port element, SSC DP_ID element and/or TSI
element may be SSC bootstrap information. The SSC bootstrap
information may include information about a transport path of the
SSC through which the SMT and/or the CMT are transmitted. For
example, the SSC IP/Port element, SSC DP_ID element and/or TSI
element may be SSC bootstrapping information transmitted through
ATSC3.0 Broadcast at the same frequency. The FIC according to the
third embodiment of the present invention may be transmitted in an
IP/UDP packet.
[1472] The service category element according to the third
embodiment of the present invention may indicate the ESG
service.
[1473] The broadcast transmission apparatus may transmit a
broadcast signal including the SMT, CMT and/or LSID.
[1474] The SMT may include a serviceID element, a category element,
a num_of LSID element, at least one LSID element, a num_of Provider
element and/or at least one provider element.
[1475] The serviceID element may specify a service. The category
element may specify the category of the service. For example, the
service_category may include the ESG service.
[1476] The num_of LSID element may indicate the number of LSIDs.
The LSID element may include information about LSIDs.
[1477] The LSID element may include ROUTE session bootstrap
information. For example, the LSID element may include a
bootstrap_network_type attribute, a is ID attribute, a partitionID
attribute, a Route_session element (or announcement session
element) and/or a URL element. The Route_session element may
include an IP(src/dest) element, a port element, a tsi element
and/or a DP element. The elements and/or attributes included in the
LSID element correspond to the aforementioned ones. Even when the
LSID element according to the present embodiment has elements and
attributes different from those of the LSID element according to
the above embodiment, the LSID element may include the same
information as the LSID element according to the above embodiment.
The Route_session element may include ROUTE session bootstrap
information. The ROUTE session bootstrap information may include
information about an LSID transmission path.
[1478] The num_of Provider element may indicate the number of
providers providing information about ESG. The provider element may
include information about a provider.
[1479] The provider element may include ESG bootstrap information.
In addition, the provider element may include information about a
provider providing information related to ESG data and/or ESG. For
example, the provider element may include a bootstrap_network_type
attribute, a ts_ID attribute, a partitionID attribute, a
Route_session element (or announcement_session element) and/or a
URL element. The Route_session element may include an IP(src/dest)
element, a port element, a tsi element and/or a DP element. The
elements and/or attributes included in the provider element
correspond to the aforementioned ones. Even when the provider
element according to the present embodiment has elements and
attributes different from those of the provider element according
to the above embodiment, the provider element may include the same
information as the provider element according to the above
embodiment. The Route_session element or announcement_session
element may include ESG bootstrap information. The ESG bootstrap
information may include information about ESG data transport path.
For example, the IP(src/dest) element and the port element may
indicate the second ROUTE session, the tsi element may indicate the
fifth transport session (tsi-101) and the DP element may indicate
the second DP (DP ID=2).
[1480] The LSID included in the fifth transport session may include
a sixth transport element (not shown) including information about
the sixth transport session, a seventh transport element TSI-101
including information about the seventh transport session and/or an
eighth transport element TSI-102 including information about the
eighth transport session. Each of the seventh transport session
element TSI-101 and the eighth transport session element TSI-102
may include a SourceFlow element and/or a RepairFlow element. The
SourceFlow element may include a realtime attribute. For example,
when the realtime attribute is "false", the realtime attribute
indicates non-real time transmission of the SourceFlow element.
[1481] The CMT may include information about an acquisition path
and/or a transport path of component data in the service. In
addition, the CMT may include information about components
transmitted through a broadband network. Furthermore, the CMT may
include information about components included in other broadcast
streams. The CMT may correspond to the aforementioned CMT. For
example, the CMT may include a serviceID attribute and/or a comp
element. The serviceID attribute may specify the corresponding
service. The serviceID attribute is an identifier of a service
associated with corresponding components. The comp element may
include information about components in the corresponding service.
For example, the comp element may include information about
components transmitted through the same broadcast stream,
information about components transmitted through a broadband
network and/or information about components transmitted through
other broadcast streams. The comp element may include at least one
of a contentLinkage attribute mapped to contentLinkage defined in
the FDT of FLUTE, a tsi attribute that specifies a transport
session through which the corresponding component in the broadcast
stream is transmitted, and a DP attribute that specifies a DP
through which the corresponding component in the broadcast stream
is transmitted. The broadcast reception apparatus may acquire
service components on the basis of the FIC.
[1482] The broadcast reception apparatus may receive a broadcast
signal including service data and signaling information. For
example, the service data may include ESG data and the signaling
information may include the FIC, SMT, CMT and/or LSID.
[1483] The broadcast reception apparatus may acquire the FIC. The
FIC may be transmitted through an IP/UDP packet.
[1484] The broadcast reception apparatus may acquire SSC bootstrap
information on the basis of the FIC. The SSC may include the SMT
and/or the CMT.
[1485] The broadcast reception apparatus may acquire the SMT on the
basis of the SSC bootstrap information included in the FIC. The SMT
may include an LSID element and/or a provider element. The LSID
element may include a ROUTE session element. The ROUTE session
element of the LSID element may include LSID transport path
information. The ROUTE session element of the provider element may
include ESG bootstrap information.
[1486] When the Service Category element indicates the ESG service,
the SMT may include the ESG bootstrap information. For example,
when the Service Category element indicates the ESG service, the
LSID transport path information described in the SMT may be
replaced by the ESG bootstrap information. The present invention is
not limited thereto and the SMT may include both the LSID transport
path information and the ESG bootstrap information.
[1487] The broadcast reception apparatus may acquire the LSID
and/or the ESG bootstrap information on the basis of the SMT. When
the Service Category indicates the ESG service, the LSID transport
path information described in the SMT may be replaced by the ESG
bootstrap information. Specifically, the IP(src/dest) element, port
element, tsi element and/or DP element included in the SMT may be
the ESG bootstrap information. The present invention is not limited
thereto and the ROUTE session element may include both the LSID and
the ESG bootstrap information, and the broadcast reception
apparatus may acquire both the LSID transport path information and
the ESG bootstrap information on the basis of the SMT.
[1488] The broadcast reception apparatus may acquire the CMT on the
basis of the SSC bootstrap information included in the FIC.
[1489] The broadcast reception apparatus may acquire component
matching information on the basis of the CMT. For example, the CMT
may include a ContentLinkage attribute, a tsi attribute and/or a DP
attribute.
[1490] The broadcast reception apparatus may acquire ESG data
and/or an ESG service on the basis of the SMT, CMT and/or LSID. For
example, the broadcast reception apparatus can acquire the ESG data
and/or the ESG service on the basis of the LSID, ESG bootstrap
information and/or the component matching information of the CMT.
For example, the broadcast reception apparatus may acquire a
transport session described in the LSID on the basis of the tsi
attribute of the CMT and acquire DP information mapped thereto.
That is, the broadcast reception apparatus may acquire an actual
component on the basis of the tsi attribute and/or the DP attribute
of the CMT. For example, the actual component may be a component
for the ESG service.
[1491] Specifically, the broadcast reception apparatus may acquire
an SGDD for the ESG data and/or the ESG service on the basis of the
LSID, ESG bootstrap information and/or the component matching
information of the CMT. Then, the broadcast reception apparatus may
acquire an SGDU for the ESG service on the basis of the SSDD.
[1492] Since the ESG data may be defined as a file, the broadcast
reception apparatus may map the ESG data to contentLinkage defined
in the FDT of the FLUTE on the basis of the contentLinkage
attribute included in the CMT. That is, the broadcast reception
apparatus may acquire the ESG data for the ESG service on the basis
of the contentLinkage attribute. In this case, the ESG service may
be provided as a file including the ESG data.
[1493] To acquire ESG Announcement Channel information and transmit
(or deliver) ESG data, the broadcast transmission apparatus
according to the third embodiment of the present invention may add
transport data pipeline information (or PLP ID) per transport
session in the LSID. That is, each transport session element of the
LSID may include a DP attribute. Consequently, the broadcast
transmission apparatus may transmit an SGDU. The broadcast
reception apparatus may receive the LSID including the data
pipeline information (or PLP ID) per transport session and acquire
the SGDU on the basis of the LSID.
[1494] In addition, the broadcast transmission apparatus according
to the third embodiment of the present invention may add ATSC 3.0
Profile to the syntax of the SGDD to add data pipeline information.
In this case, the broadcast reception apparatus may receive SGDD
and acquire the SGDU on the basis of the data pipeline information
of the SGDD.
[1495] FIG. 129 illustrates signaling of ESG bootstrap information
according to a fourth embodiment of the present invention.
[1496] The fourth embodiment of the present invention provides a
method for transmitting the ESG bootstrap information using a
service level descriptor of the SMT in the future broadcast system.
The ESG may be defined as a separate broadcast service. The Service
Category element may indicate ESG service in the service loop of
the FIC, and the SMT and the CMT may be transmitted through the
SSC. The SMT mapped to an ESG service may include an ESG bootstrap
descriptor and the ESG bootstrap descriptor may be defined as a
service level descriptor.
[1497] Referring to the figure, an actual stream according to the
fourth embodiment of the present invention may include a broadcast
stream having a frequency of "Frqncy-z". The broadcast stream
according to an embodiment of the present invention may include a
first partition A. The first partition A may include a first DP, a
second DP, a third DP, a fourth DP and/or the FIC. The first DP may
include a first ROUTE session. The first ROUTE session may include
a first service (A/V service). The first ROUTE session may include
a first transport session (tsi-v), a second transport session
(tsi-a), a third transport session (tsi-s) and/or a fourth
transport session (tsi-0). The first ROUTE session illustrated in
the figure may correspond to the aforementioned first ROUTE
session.
[1498] The second DP, the third DP and the fourth DP may include a
second ROUTE session. The second ROUTE session may include a second
service. For example, the second service may include an ESG
service. The second ROUTE session may include a fifth transport
session (tsi-0), a sixth transport session (tsi-ssc), a seventh
transport session (tsi-101) and/or an eighth transport session
(tsi-102). The second ROUTE session illustrated in the figure may
correspond to the aforementioned second ROUTE session.
[1499] The broadcast transmission apparatus may transmit a
broadcast signal including service data and signaling information.
For example, the service data may include ESG data and the
signaling information may include an FIC, SMT, CMT and/or LSID.
[1500] The broadcast transmission apparatus may transmit a
broadcast signal including the FIC.
[1501] The FIC may correspond to the aforementioned FIC. For
example, the FIC may include at least one PartitionID element that
specifies a partition, a ServiceID element that specifies a
service, a Service Category element that indicates the category of
the service, an SSC IP/Port element that specifies a IP/port
through which an SSC is transmitted, an SSC DP_ID element that
specifies a DP through which the SSC is transmitted, a TSI element
that specifies a transport session through which the SSC is
transmitted and/or a partition level descriptor.
[1502] The SSC IP/Port element, SSC DP_ID element and/or TSI
element may be SSC bootstrap information. The SSC bootstrap
information may include information about a transport path of the
SSC through which the SMT and/or the CMT are transmitted. For
example, the SSC IP/Port element, SSC DP_ID element and/or TSI
element may be SSC bootstrapping information transmitted through
ATSC3.0 Broadcast at the same frequency. The FIC according to the
fourth embodiment of the present invention may be included in an
IP/UDP packet and transmitted.
[1503] The service category element according to the fourth
embodiment of the present invention may indicate the ESG
service.
[1504] The broadcast transmission apparatus may transmit a
broadcast signal including the SMT, CMT and/or LSID.
[1505] The SMT may correspond to the aforementioned SMT. For
example, the SMT may include a serviceID attribute that specifies a
service, a category attribute that specifies the category of the
service, at least one ROUTE session element including information
about a ROUTE session and/or at least one service level descriptor.
The ROUTE session element may include ROUTE session bootstrap
information. The ROUTE session element may include LSID bootstrap
information (or LSID transport path information). The category
attribute may indicate an ESG service.
[1506] The service level descriptor may include ESG bootstrap
information. When the service category element according to the
fourth embodiment of the present invention indicates the ESG
service, the SMT may include the service level descriptor including
the ESG bootstrap information. The broadcast transmission apparatus
may transmit the ESG bootstrap information through the service
level descriptor.
[1507] The LSID may correspond to the aforementioned LSID. For
example, the LSID may include a seventh transport element TSI-101
including information about the seventh transport session and/or an
eighth transport element TSI-102 including information about the
eighth transport session. Each of the seventh transport session
element TSI-101 and the eighth transport session element TSI-102
may include a SourceFlow element that provides information about a
source flow included in the corresponding transport session and/or
a RepairFlow element that provides information about a repair flow
included in the transport session. The SourceFlow element may
include a realtime attribute that indicates whether the SourceFlow
element carries streaming media data. For example, when the
realtime attribute is "true", the realtime attribute indicates
real-time transmission of the SourceFlow element. When the realtime
attribute is "false", the realtime attribute indicates non-real
time transmission of the SourceFlow element.
[1508] The CMT may correspond to the aforementioned CMT. For
example, the CMT may include a serviceID attribute that specifies
the corresponding service and/or a component element containing
information about a component in the service. The component element
may include at least one of a contentLinkage attribute mapped to
contentLinkage defined in the FDT of FLUTE, a tsi attribute that
specifies a transport session through which the corresponding
component in the broadcast stream is transmitted, and a DP
attribute that specifies a DP through which the corresponding
component in the broadcast stream is transmitted.
[1509] The broadcast reception apparatus may receive a broadcast
signal including service data and signaling data. For example, the
service data may include ESG data and the signaling information may
include the FIC, SMT, CMT and/or LSID.
[1510] The broadcast reception apparatus may acquire the FIC. The
FIC may be transmitted through an IP/UDP packet. For example, the
service category element may indicate an ESG service. The FIC may
include SSC bootstrap information in the service loop. The SSC may
include the SMT and/or the CMT.
[1511] The broadcast reception apparatus may acquire the SMT on the
basis of the SSC bootstrap information included in the FIC. The SMT
may include at least one ROUTE session element and/or at least one
service level descriptor.
[1512] The broadcast reception apparatus may acquire the LSID on
the basis of the ROUTE session element included in the SMT. The
ROUTE session element may include ROUTE session bootstrap
information. The ROUTE session bootstrap information may include
LSID transport path information.
[1513] In addition, the broadcast reception apparatus may acquire
ESG bootstrap information from the service level descriptor
included in the SMT. When the service category element indicates
the ESG service, the SMT may include the service level descriptor
including the ESG bootstrap information.
[1514] The broadcast reception apparatus may acquire the CMT on the
basis of the SSC bootstrap information included in the FIC. The
broadcast reception apparatus may acquire component matching
information on the basis of the CMT. For example, the CMT may
include a ContentLinkage attribute, a tsi attribute and/or a DP
attribute.
[1515] The broadcast reception apparatus may acquire ESG data
and/or an ESG service on the basis of the SMT, CMT and/or LSID. For
example, the broadcast reception apparatus may acquire the ESG data
and/or the ESG service on the basis of the LSID, ESG bootstrap
information and/or the component matching information of the CMT.
For example, the broadcast reception apparatus may acquire a
transport session described in the LSID on the basis of the tsi
attribute of the CMT and acquire DP information mapped thereto.
That is, the broadcast reception apparatus may acquire an actual
component on the basis of the tsi attribute and/or the DP attribute
of the CMT. For example, the actual component may be a component
for the ESG service.
[1516] Specifically, the broadcast reception apparatus may acquire
an SGDD for the ESG data and/or the ESG service on the basis of the
LSID, ESG bootstrap information and/or the component matching
information of the CMT. Then, the broadcast reception apparatus may
acquire an SGDU for the ESG service on the basis of the SSDD.
[1517] Since the ESG data may be defined as a file, the broadcast
reception apparatus may map the ESG data to contentLinkage defined
in the FDT of FLUTE on the basis of the contentLinkage attribute
included in the CMT. That is, the broadcast reception apparatus may
acquire the ESG data for the ESG service on the basis of the
contentLinkage attribute. In this case, the ESG service may be
provided as a file including the ESG data.
[1518] To acquire ESG Announcement Channel information and transmit
(or deliver) ESG data, the broadcast transmission apparatus
according to the fourth embodiment of the present invention may add
transport data pipeline information (or PLP ID) per transport
session in the LSID. That is, each transport session element of the
LSID may include a DP attribute. Consequently, the broadcast
transmission apparatus may transmit an SGDU. The broadcast
reception apparatus may receive the LSID including the data
pipeline information (or PLP ID) per transport session and acquire
the SGDU on the basis of the LSID.
[1519] In addition, the broadcast transmission apparatus according
to the fourth embodiment of the present invention may add an ATSC
3.0 Profile to the syntax of the SGDD to add data pipeline
information. In this case, the broadcast reception apparatus may
receive SGDD and acquire the SGDU on the basis of the data pipeline
information of the SGDD.
[1520] FIG. 130 illustrates signaling of ESG bootstrap information
according to a fifth embodiment of the present invention.
[1521] The fifth embodiment of the present invention provides a
method for transmitting the ESG bootstrap information using a guide
access table (GAT) in the future broadcast network. An ESG may be
defined as a service, the service category may indicate the ESG
service in the FIC service loop and the SMT, GAT and/or CMT may be
transmitted through an SSC. The SMT mapped to the ESG service may
include information on a ROUTE session through which LSID is
transmitted. In the fifth embodiment of the present invention, the
SSC with respect to the ESG service may include the GAT and the GAT
may include ESG bootstrap information.
[1522] Referring to the figure, an actual stream according to the
fifth embodiment of the present invention may include a broadcast
stream having a frequency of "Frqncy-z". The broadcast stream
according to an embodiment of the present invention may include a
first partition A. The first partition A may include a first DP, a
second DP, a third DP, a fourth DP and/or the FIC. The first DP may
include a first ROUTE session. The first ROUTE session may include
a first service (A/V service). The first ROUTE session may include
a first transport session (tsi-v), a second transport session
(tsi-a), a third transport session (tsi-s) and/or a fourth
transport session (tsi-0). The first ROUTE session illustrated in
the figure may correspond to the aforementioned first ROUTE
session.
[1523] The second DP, the third DP and the fourth DP may include a
second ROUTE session. The second ROUTE session may include a second
service. For example, the second service may include an ESG
service. The second ROUTE session may include a fifth transport
session (tsi-0), a sixth transport session (tsi-ssc), a seventh
transport session (tsi-101) and/or an eighth transport session
(tsi-102). The second ROUTE session illustrated in the figure may
correspond to the aforementioned second ROUTE session.
[1524] The broadcast transmission apparatus may transmit a
broadcast signal including service data and signaling information.
For example, the service data may include ESG data and the
signaling information may include an FIC, SMT, GAT, CMT and/or
LSID.
[1525] The broadcast transmission apparatus may transmit a
broadcast signal including the FIC.
[1526] The FIC may correspond to the aforementioned FIC. For
example, the FIC may include at least one PartitionID element that
specifies a partition, a ServiceID element that specifies a
service, a Service Category element that indicates the category of
the service, an SSC IP/Port element that specifies an
IPaddress/port through which an SSC is transmitted, an SSC DP_ID
element that specifies a DP through which the SSC is transmitted, a
TSI element that specifies a transport session through which the
SSC is transmitted and/or a partition level descriptor.
[1527] The SSC IP/Port element, SSC DP_ID element and/or TSI
element may be SSC bootstrap information. The SSC bootstrap
information may include information about a transport path of the
SSC through which the SMT and/or the CMT are transmitted. For
example, the SSC IP/Port element, SSC DP_ID element and/or TSI
element may be SSC bootstrapping information transmitted through
ATSC3.0 Broadcast at the same frequency. The FIC according to the
fifth embodiment of the present invention may be included in an
IP/UDP packet and transmitted.
[1528] The service category element according to the fifth
embodiment of the present invention may indicate the ESG service.
In addition, when the service category element indicates the ESG
service, the GAT may be essentially transmitted.
[1529] The broadcast transmission apparatus may transmit a
broadcast signal including the SMT, CMT, GAT and/or LSID.
[1530] The SMT may correspond to the aforementioned SMT. For
example, the SMT may include a serviceID attribute that specifies a
service and at least one ROUTE session element including
information about a ROUTE session. The ROUTE session element may
include ROUTE session bootstrap information (or LSID bootstrap
information and LSID transport path information).
[1531] The GAT may include information about service guide (SG)
data sources associated with the corresponding service. For
example, the GAT may include a serviceID attribute that specifies
the corresponding service, a num_of_provider element that indicates
the number of service guide providers and/or at least one provider
element (service guide provider element) that includes information
about service guide providers.
[1532] The provider element may include ESG bootstrap information.
For example, the provider element may include ESG data and/or
information about a provider providing ESG related information. The
ESG bootstrap information may include a bootstrap_network_type
attribute, a ts_ID attribute, a partitionID attribute, a
Route_session element and/or a URL attribute.
[1533] The bootstrap_network_type attribute indicates ESG bootstrap
information transmission type. The bootstrap_network_type attribute
may indicate the aforementioned network_type attribute.
[1534] The ts_ID attribute indicates the transport stream ID of a
foreign frequency when the ESG bootstrap information is transmitted
through the foreign frequency. The ts_ID attribute may indicate the
aforementioned transportStreamID element.
[1535] The partitionID attribute indicates the partition ID of a
foreign frequency when the ESG bootstrap information is transmitted
through the foreign frequency. The partitionID attribute may
indicate the aforementioned partitionID element.
[1536] The Route_session element may include information specifying
a ROUTE session. For example, the Route_session element may include
at least one of an IP(src/dest) attribute, a port attribute, an
announcement_tsi element and an announcement_DP element. The IP
(src/dest) attribute may include the aforementioned sourceIPAddr
element and destIPAddr element. The port attribute may indicate the
aforementioned destUDPPort element. A combination of the
sourceIPAddr element, destIPAddr element and port element may
specify a specific ROUTE session. The announcement_tsi element may
indicate the identifier that identifies a transport session and/or
an LCT session through which the ESG service and/or ESG bootstrap
information are transmitted. The announcement_DP element may
indicate the identifier that identifies a PLP and/or a DP through
which the ESG service and/or ESG bootstrap information are
transmitted. The announcement DP element may indicate the
aforementioned datapipeID element.
[1537] The URL attribute may specify a URL by which signaling
information for the ESG bootstrap information and/or ESG may be
accessed. The URL attribute may indicate the aforementioned
downloadURL element.
[1538] The CMT may correspond to the aforementioned CMT. For
example, the CMT may include a serviceID attribute that specifies
the corresponding service and/or a component element containing
information about a component in the service. The component element
may include at least one of a contentLinkage attribute mapped to
contentLinkage defined in the FDT of FLUTE, a tsi attribute that
specifies a transport session through which the corresponding
component in the broadcast stream is transmitted, and a DP
attribute that specifies a DP through which the corresponding
component in the broadcast stream is transmitted.
[1539] The LSID may correspond to the aforementioned LSID. For
example, the LSID may include a seventh transport element TSI-101
including information about the seventh transport session and/or an
eighth transport element TSI-102 including information about the
eighth transport session. Each of the seventh transport session
element TSI-101 and the eighth transport session element TSI-102
may include a SourceFlow element that provides information about a
source flow included in the corresponding transport session and/or
a RepairFlow element that provides information about a repair flow
included in the transport session. The SourceFlow element may
include a realtime attribute that indicates whether the SourceFlow
element carries streaming media data. For example, when the
realtime attribute is "true", the realtime attribute indicates
real-time transmission of the SourceFlow element. When the realtime
attribute is "false", the realtime attribute indicates non-real
time transmission of the SourceFlow element.
[1540] The broadcast reception apparatus may receive a broadcast
signal including service data and signaling data. For example, the
service data may include ESG data and the signaling information may
include the FIC, SMT, GAT, CMT and/or LSID.
[1541] The broadcast reception apparatus may acquire the FIC. The
FIC may be transmitted through an IP/UDP packet. For example, the
service category element may indicate an ESG service. The FIC may
include SSC bootstrap information in the service loop. When the
service category element indicates the ESG service, the GAT may be
essentially transmitted.
[1542] The broadcast reception apparatus may acquire SSC bootstrap
information on the basis of the FIC. The SSC may include the SMT,
CMT and/or GAT.
[1543] The broadcast reception apparatus may acquire the SMT on the
basis of the SSC bootstrap information included in the FIC. The
broadcast reception apparatus may acquire ROUTE bootstrap
information (or LSID bootstrap information and LSID transport path
information) on the basis of the ROUTE session element included in
the SMT. In addition, the broadcast reception apparatus may acquire
the LSID on the basis of the SMT. Specifically, the broadcast
reception apparatus may acquire the LSID on the basis of the ROUTE
bootstrap information of the SMT.
[1544] The broadcast reception apparatus may acquire the GAT on the
basis of the SSC bootstrap information included in the FIC. In
addition, the broadcast reception apparatus may acquire the ESG
bootstrap information from the GAT.
[1545] The broadcast reception apparatus may acquire the CMT on the
basis of the SSC bootstrap information included in the FIC. The
broadcast reception apparatus may acquire component matching
information on the basis of the CMT. For example, the CMT may
include a ContentLinkage attribute, a tsi attribute and/or a DP
attribute.
[1546] The broadcast reception apparatus may acquire ESG data
and/or an ESG service on the basis of the SMT, GAT, CMT and/or
LSID. For example, the broadcast reception apparatus may acquire
the ESG data and/or the ESG service on the basis of the LSID, ESG
bootstrap information and/or the component matching information of
the CMT. For example, the broadcast reception apparatus may acquire
a transport session described in the LSID on the basis of the tsi
attribute of the CMT and acquire DP information mapped thereto.
That is, the broadcast reception apparatus may acquire an actual
component on the basis of the tsi attribute and/or the DP attribute
of the CMT. For example, the actual component may be a component
for the ESG service.
[1547] Specifically, the broadcast reception apparatus may acquire
an SGDD for the ESG data and/or the ESG service on the basis of the
LSID, ESG bootstrap information and/or the component matching
information of the CMT. Then, the broadcast reception apparatus may
acquire an SGDU for the ESG service on the basis of the SSDD.
[1548] Since the ESG data may be defined as a file, the broadcast
reception apparatus may map the ESG data to contentLinkage defined
in the FDT of FLUTE on the basis of the contentLinkage attribute
included in the CMT. That is, the broadcast reception apparatus may
acquire the ESG data for the ESG service on the basis of the
contentLinkage attribute. In this case, the ESG service may be
provided as a file including the ESG data.
[1549] To acquire ESG Announcement Channel information and transmit
(or deliver) ESG data, the broadcast transmission apparatus
according to the fifth embodiment of the present invention may add
transport data pipeline information (or PLP ID) per transport
session in the LSID. That is, each transport session element of the
LSID may include a DP attribute. Consequently, the broadcast
transmission apparatus may transmit an SGDU. The broadcast
reception apparatus may receive the LSID including the data
pipeline information (or PLP ID) per transport session and acquire
the SGDU on the basis of the LSID.
[1550] In addition, the broadcast transmission apparatus according
to the fifth embodiment of the present invention may add ATSC 3.0
Profile to the syntax of the SGDD to add data pipeline information.
In this case, the broadcast reception apparatus may receive SGDD
and acquire the SGDU on the basis of the data pipeline information
of the SGDD.
[1551] FIG. 131 illustrates the GAT according to the fifth
embodiment of the present invention.
[1552] A signaling information format available in the future
broadcast network according to the present invention is described.
Signaling information may include a signaling message header and a
signaling message. The signaling message may be represented in
binary or XML format. The signaling message may be included as a
payload such as an IP datagram or application layer transport
packet (e.g. ROUTE or MMT) and transmitted. For example, the
signaling message may include the GAT.
[1553] The signaling message header may include a signaling_id
element and a service_id element. The signaling_id element
indicates the identifier of a signaling message. For example, the
signaling_id element may indicate a GAT signaling message. The
service_id element indicates the identifier of a service. For
example, the service_id element may indicate an ESG service. The
SMT may include an identifier mapped to the service_id element.
[1554] The GAT may include at least one service level descriptor.
For example, the GAT may include ESG bootstrapping description.
[1555] The ESG bootstrapping description may include information
for bootstrapping of an ESG. The ESG bootstrapping information may
include ESG bootstrap information and/or bootstrapping information
for the ESG. The broadcast reception apparatus may receive, acquire
and/or process the ESG on the basis of the ESG bootstrapping
description and/or the ESG bootstrap information.
[1556] The ESG bootstrapping description may include at least one
service guide (SG) provider element.
[1557] An SG provider indicates a provider that provides
information related to an ESG. The SG provider element may include
a name attribute and/or at least one bootstrap element.
[1558] The name attribute indicates the name of the SG
provider.
[1559] The bootstrap element may include at least one piece of
bootstrapping information. The bootstrap element may include a
network_type attribute, a sourceIPAddr element, a destIPAddr
element, a destUDPPort element, a transportStreamID element, a
partitionID element, a datapipeID element, a tsi element and/or a
downloadURL element. For example, the bootstrap element may be ESG
bootstrap information.
[1560] The network_type element may indicate an ESG data
transmission type.
[1561] The sourceIPAddr element may indicate the source ID
addresses of ESG data and/or SG data. For example, the sourceIPAddr
element may include the IP source addresses of packets carrying
service layer signaling information for a service and/or ESG.
[1562] The destIPAddr element may indicate the destination IP
address of the ESG data and/or SG data. For example, the destIPAddr
element may include the destination IP addresses of packets
carrying service layer signaling information for a service and/or
ESG.
[1563] The destUDPPort element may indicate the destination port
number of the ESG data and/or SG data. For example, the destUDPPort
element may include the port number of packets carrying service
layer signaling information for a service and/or ESG.
[1564] The transportStreamID element may indicate the transport
stream identifier corresponding to a foreign frequency when the ESG
data is transmitted through the foreign frequency. This value may
be selectively included in the bootstrap element according to the
value of the network_type attribute.
[1565] The partitionID element may indicate the partition
identifier corresponding to a foreign frequency when the ESG data
is transmitted through the foreign frequency. For example, the
partition identifier identifies a broadcaster. This value may be
selectively included in the bootstrap element according to the
value of the network_type attribute.
[1566] The datapipeID element may indicate the identifier
identifying a PLP and/or a DP through which the ESG data is
transmitted. This value may be selectively included in the
bootstrap element according to the value of the network_type
attribute. For example, when the ESG data is transmitted through a
broadcast network, the datapipeID element may have a single
value.
[1567] The tsi element may indicate the identifier identifying the
transport session and/or an LCT session through which the ESG data
is transmitted. This value may be selectively included in the
bootstrap element according to the value of the network_type
attribute. For example, when the ESG data is transmitted through a
broadcast network, the tsi element may include at least one
value.
[1568] The downloadURL element may indicate the URL by which the
ESG data transmitted through a broadband network may be accessed.
This value may be selectively included in the bootstrap element
according to the value of the network_type attribute. For example,
when the ESG data is transmitted through a broadband network, the
downloadURL element may have a single value.
[1569] The broadcast transmission apparatus may transmit a
broadcast signal including service data and signaling information.
The service data may include an ESG service. The signaling
information may include the GAT and the GAT may include ESG
bootstrap information in the service level descriptor. The
broadcast reception apparatus may receive the broadcast signal
including the service data and the signaling information. The
broadcast reception apparatus may acquire and/or process an ESG
service on the basis of the ESG bootstrap information included in
the signaling information.
[1570] FIG. 132 illustrates effects of the first to fifth
embodiments of the present invention.
[1571] Effects of the first embodiment of the present invention
will now be described.
[1572] As to FIC purpose (fast channel scan), information
irrelevant to fast scan is repeatedly transmitted in the first
embodiment of the present invention. For example, the FIC can
include ESG bootstrap information in the partition level
descriptor. Accordingly, the ESG bootstrap information can be
repeatedly delivered in the first embodiment of the present
invention.
[1573] With reference to FIC size, since the ESG is not defined as
a service in the first embodiment of the present invention, the FIC
size is reduced by a size excluded from the service loop. For
example, the FIC size can be decreased by a size corresponding to
SSC bootstrap information excluded from the service loop. In
addition, the FIC size may be increased by the ESG bootstrap
information.
[1574] As to FIC semantics definition, since the ESG is not defined
as a service in the first embodiment of the present invention, FIC
semantics are clearly defined. For example, the service loop does
not include the ESG bootstrap information and the partition level
descriptor includes the ESG bootstrap information.
[1575] With regard to ESG bootstrap information acquisition time,
the FIC is continuously changed when the ESG bootstrap information
is varied in the first embodiment of the present invention.
Accordingly, the ESG bootstrap information included in the FIC can
be rapidly acquired in the first embodiment of the present
invention.
[1576] As to clear semantics definition, the ESG is not defined as
a service in the first embodiment of the present invention and thus
FIC semantics are clearly defined.
[1577] With regard to LSID extension, definition of mapping between
TSIs and DPs in the LSID is necessary for mapping of DP information
in the first embodiment of the present invention.
[1578] As to consistency, in the first embodiment of the present
invention, the FIC maintains consistency and the SSC may not be
present.
[1579] Effects of the second embodiment of the present invention
will now be described.
[1580] As to FIC purpose (fast channel scan), information
irrelevant to fast scan is repeatedly transmitted in the second
embodiment of the present invention. For example, the SSC bootstrap
information of the service loop of the FIC can be replaced by the
ESG bootstrap information. The SSC bootstrap information may
correspond to the ESG bootstrap information. Accordingly, the ESG
bootstrap information can be repeatedly delivered in the second
embodiment of the present invention.
[1581] With reference to FIC size, the FIC size is not increased
when the FIC includes the source IP address, destination IP
address, destination port number, TSI information and/or DP
information for ESG bootstrap information in the second embodiment
of the present invention. However, when the FIC includes broadcast
information and broadband information regarding a foreign frequency
for the ESG bootstrap information, the FIC size may be
increased.
[1582] As to FIC semantics definition, purpose of the SSC depends
on service category in the second embodiment of the present
invention. For example, when the service category indicates an ESG
service, the SSC bootstrap information can be replaced by the ESG
bootstrap information. Otherwise, the SSC bootstrap information can
correspond to the ESG bootstrap information. When the service
category does not indicate the ESG service, the SSC bootstrap
information can be used for the original purpose thereof.
[1583] With regard to ESG bootstrap information acquisition time,
the FIC is continuously changed when the ESG bootstrap information
is varied in the second embodiment of the present invention.
Accordingly, the ESG bootstrap information included in the FIC can
be rapidly acquired in the second embodiment of the present
invention.
[1584] As to clear semantics definition, definition of the SSC
bootstrap information according to the service category can be
changed in the second embodiment of the present invention. In
addition, signaling information may not include the SMT and/or the
CMT in the second embodiment of the present invention.
[1585] As to LSID extension, definition of mapping between TSIs and
DPs in the LSID is necessary for mapping of DP information in the
second embodiment of the present invention.
[1586] As to consistency, signaling information may not include the
SMT and/or the CMT even though a service belongs to service
category in the second embodiment of the present invention.
[1587] Effects of the third embodiment of the present invention
will now be described.
[1588] As to the FIC size, an FIC size for an ESG service may
correspond to an FIC size for an A/V service in the third
embodiment of the present invention.
[1589] As to FIC semantics definition, the FIC can include the SSC
bootstrap information that indicates information regarding SSC
delivery in the third embodiment of the present invention.
[1590] With reference to ESG bootstrap information acquisition
time, since the ESG bootstrap information is not included in the
FIC in the third embodiment, it takes a longer time to acquire the
ESG bootstrap information, compared to the first and second
embodiments.
[1591] As to a service signaling bandwidth, efficiency in terms of
signaling bandwidth may be deteriorated when the ESG bootstrap
information is included in the descriptor, considering that the SMT
needs to be frequently transmitted in the third embodiment of the
present invention.
[1592] As to clear semantics definition, definition of LSID
transmission information of the SMT needs to be discriminated from
definition of providers in the third embodiment of the present
invention.
[1593] With reference to LSID extension, while LSID extension is
not essential to the third embodiment of the present invention, the
CMT may need to be extended. The CMT can include DP configuration
information according to TSI and/or DP configuration information
according to ContentLinkage.
[1594] Effects of the fourth embodiment of the present invention
will now be described.
[1595] As to the FIC size, an FIC size for an ESG service may
correspond to an FIC size for an A/V service in the fourth
embodiment of the present invention.
[1596] As to FIC semantics definition, the FIC can include the SSC
bootstrap information that indicates information regarding SSC
delivery in the fourth embodiment of the present invention.
[1597] With reference to ESG bootstrap information acquisition
time, since the ESG bootstrap information is not included in the
FIC in the fourth embodiment, it takes a longer time to acquire the
ESG bootstrap information, compared to the first and second
embodiments. However, the ESG bootstrap information acquisition
time according to the fourth embodiment of the present invention
may correspond to the ESG bootstrap information acquisition time
according to the third embodiment of the present invention.
[1598] As to a service signaling bandwidth, efficiency in terms of
signaling bandwidth may be deteriorated when the ESG bootstrap
information is included in the descriptor, considering that the SMT
needs to be frequently transmitted in the fourth embodiment of the
present invention.
[1599] As to clear semantics definition, the FIC includes the SSC
bootstrap information and the SMT includes the ESG bootstrap
information in the fourth embodiment of the present invention, and
thus clear semantics can be defined.
[1600] With reference to LSID extension, while LSID extension is
not essential in the fourth embodiment of the present invention,
the CMT may need to be extended. The CMT can include DP
configuration information according to TSI and/or DP configuration
information according to ContentLinkage.
[1601] As to consistency, ESG bootstrap information delivery to the
service level descriptor of the SMT may not be consistent in the
fourth embodiment of the present invention.
[1602] Effects of the fifth embodiment of the present invention
will now be described.
[1603] As to the FIC size, an FIC size for an ESG service may
correspond to an FIC size for an A/V service in the fifth
embodiment of the present invention.
[1604] As to FIC semantics definition, the FIC can include the SSC
bootstrap information that indicates information regarding SSC
delivery in the fifth embodiment of the present invention.
[1605] With reference to ESG bootstrap information acquisition
time, the ESG bootstrap information acquisition time according to
the fifth embodiment of the present invention may be longer than
the ESG bootstrap information acquisition time according to the
fourth embodiment of the present invention.
[1606] As to a service signaling bandwidth, the bandwidth can be
saved if the GAT is not transmitted more frequently than the SMT in
the fifth embodiment of the present invention.
[1607] As to clear semantics definition, the FIC includes the SSC
bootstrap information, the SMT includes the ROUTE bootstrap
information (LSID transport path information) and the GAT includes
the ESG bootstrap information in the fifth embodiment of the
present invention, and thus clear semantics can be defined.
[1608] With reference to LSID extension, while LSID extension is
not essential to the fifth embodiment of the present invention, the
CMT may need to be extended. The CMT can include DP configuration
information according to TSI and/or DP configuration information
according to ContentLinkage.
[1609] FIG. 133 is a flowchart illustrating operation of a
broadcast reception apparatus according to an embodiment of the
present invention.
[1610] The broadcast reception apparatus according to an embodiment
of the present invention may include a broadcast interface, a
broadband interface and/or a controller. The broadcast interface,
the broadband interface and/or the controller according to an
embodiment of the present invention may include the above
description.
[1611] For example, the broadcast interface may receive a broadcast
signal through a broadcast network. The broadcast interface may
include a physical layer module and a physical layer IP frame
module. Otherwise, the broadcast interface may include at least one
of a tuner and a physical frame parser.
[1612] For example, the broadband interface may transmit and/or
receive data over the Internet. The broadband interface may include
an Internet access control module.
[1613] For example, the controller may include the aforementioned
signaling decoder, database, service signaling manager, alert
signaling manager, service guide manager, application signaling
manager, targeting signaling manager, streaming media engine,
non-real time file processor, component synchronizer, targeting
processor, application processor, alert processor, A/V processor,
redistribution module, service/content acquisition controller
and/or companion screen interface. The companion screen interface
may include a data sharing unit and/or a device manager. Components
included in the controller according to an embodiment of the
present invention may include the aforementioned corresponding
components.
[1614] In addition, the controller may include at least one of the
aforementioned physical layer controller, link layer frame parser
(or link layer frame processor), IP/UDP datagram filter,
application layer transport client, timing controller, system
clock, DTV control engine, user input receiver, signaling parser,
channel map database, HTTP access client, HTTP access cache, DASH
client, ISO BMFF parser, media decoder and file database.
Components included in the controller according to an embodiment of
the present invention may include the aforementioned corresponding
components.
[1615] The broadcast reception apparatus may receive a broadcast
signal including service data and signaling information using the
broadcast interface (CS1330100).
[1616] The signaling information may include first signaling
information for service acquisition. For example, the first
signaling information may include an SMT, a GAT, a CMT and/or an
LSID.
[1617] In addition, the signaling information may include second
signaling information providing bootstrap discovery. That is, the
signaling information may include the second signaling information
containing bootstrap information for services. For example, the
second signaling information may include an FIC.
[1618] The service data may include ESG data.
[1619] The signaling information may include ESG bootstrap
information for electronic service guide (ESG) data.
[1620] The broadcast reception apparatus may acquire the service
data on the basis of the signaling information using the controller
(CS1330200).
[1621] Subsequently, the broadcast reception apparatus may decode
the service data using the controller (CS1330300).
[1622] For example, the ESG bootstrap information may include type
information (or network_type attribute) that indicates a
transmission type of ESG data.
[1623] For example, the ESG bootstrap information may include at
least one of a source IP address element (or sourceIPAddr element)
that indicates the source IP address of the ESG data, a destination
IP address element (or destIPAddr element) that indicates the
destination IP address of the ESG data and a destination port
number element (or destUDPPort element) that indicates the
destination port number of the ESG data.
[1624] For example, the ESG bootstrap information may include a
transportStreamID element that specifies a frequency at which the
ESG data is transmitted, a partitionID element that specifies a
partition corresponding to the frequency, a PLP ID element (or
datapipeID element) that specifies a physical layer pipe (PLP)
through which the ESG data is transmitted, a TSI element (or tsi
element) that indicates a transport session through which the ESG
data is transmitted and/or a URL element (or downloadURL attribute)
that indicates the location of the ESG data transmitted through
broadband.
[1625] The second signaling information may include ESG bootstrap
information. In addition, the second signaling information may
include category information (or service category element) that
indicates service category. The category information may indicate
an ESG service.
[1626] The first signaling information may include a transport
session element containing information about a transport session,
and the transport session element may include a PLP ID element (or
DP attribute) that indicates a PLP for the transport session.
[1627] While the broadcast reception apparatus has been described,
a broadcast transmission apparatus capable of executing reverse
functions of those of the broadcast reception apparatus may be
provided according to an embodiment of the present invention. For
example, the broadcast transmission apparatus may include a
controller and/or a transmitter. The controller may generate the
aforementioned service data and/or the signaling information. The
transmitter may transmit a broadcast signal including the service
data and/or the signaling information.
[1628] Modules or units may be processors executing consecutive
processes stored in a memory (or a storage unit). The steps
described in the aforementioned embodiments can be performed by
hardware/processors. Modules/blocks/units described in the above
embodiments can operate as hardware/processors. The methods
proposed by the present invention can be executed as code. Such
code can be written on a processor-readable storage medium and thus
can be read by a processor provided by an apparatus.
[1629] While the embodiments have been described with reference to
respective drawings for convenience, embodiments may be combined to
implement a new embodiment. In addition, designing a
computer-readable recording medium which stores programs for
implementing the aforementioned embodiments is within the scope of
the present invention.
[1630] The apparatus and method according to the present invention
are not limited to the configurations and methods of the
above-described embodiments and all or some of the embodiments may
be selectively combined to obtain various modifications.
[1631] The methods proposed by the present invention may be
implemented as processor-readable code stored in a
processor-readable recording medium included in a network device.
The processor-readable recording medium includes all kinds of
recording media storing data readable by a processor. Examples of
the processor-readable recording medium include a ROM, a RAM, a
CD-ROM, a magnetic tape, a floppy disk, an optical data storage
device and the like, and implementation as carrier waves such as
transmission over the Internet. In addition, the processor-readable
recording medium may be distributed to computer systems connected
through a network, stored and executed as code readable in a
distributed manner.
[1632] Although the preferred embodiments of the present invention
have been disclosed for illustrative purposes, those skilled in the
art will appreciate that various modifications, additions and
substitutions are possible, without departing from the scope and
spirit of the invention as disclosed in the accompanying claims.
Such modifications should not be individually understood from the
technical spirit or prospect of the present invention.
[1633] Both apparatus and method inventions are mentioned in this
specification and descriptions of both the apparatus and method
inventions may be complementarily applied to each other.
[1634] Those skilled in the art will appreciate that the present
invention may be carried out in other specific ways than those set
forth herein without departing from the spirit and essential
characteristics of the present invention. Therefore, the scope of
the invention should be determined by the appended claims and their
legal equivalents, not by the above description, and all changes
coming within the meaning and equivalency range of the appended
claims are intended to be embraced therein.
[1635] In the specification, both the apparatus invention and the
method invention are mentioned and description of both the
apparatus invention and the method invention can be applied
complementarily.
[1636] Various embodiments have been described in the best mode for
carrying out the invention.
[1637] The present invention is applied to broadcast signal
providing fields.
[1638] Various equivalent modifications are possible within the
spirit and scope of the present invention, as those skilled in the
relevant art will recognize and appreciate. Accordingly, it is
intended that the present invention cover the modifications and
variations of this invention provided they come within the scope of
the appended claims and their equivalents.
* * * * *