U.S. patent application number 15/887376 was filed with the patent office on 2018-08-09 for apparatus and method for transmitting/receiving of data in wireless communication system.
The applicant listed for this patent is Samsung Electronics Co., Ltd.. Invention is credited to Sungnam HONG, Chanhong KIM, Taeyoung KIM, Jongbu LIM, Jiyun SEOL, Yeohun YUN.
Application Number | 20180227910 15/887376 |
Document ID | / |
Family ID | 63038221 |
Filed Date | 2018-08-09 |
United States Patent
Application |
20180227910 |
Kind Code |
A1 |
HONG; Sungnam ; et
al. |
August 9, 2018 |
APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING OF DATA IN WIRELESS
COMMUNICATION SYSTEM
Abstract
The present disclosure relates to a fifth generation (5G) or
pre-5G communication system supporting a higher data transmission
rate since fourth generation (4G) communication systems like long
term evolution (LTE). A method for transmitting heterogeneous
service data from a base station is provided. The method for
transmitting data includes at least one processor configured to
control to allocate a first resource by scheduling to provide the
first service data to the first terminal, identify whether the
second service data to be transmitted to the first terminal or the
second terminal is generated using at least some of the first
resource during the transmission of the first service data to the
first terminal using the first resource, transmit the second
service data by allocating the second service data to at least some
of the first resource if the second service data is generated, and
configure and transmit the second service data.
Inventors: |
HONG; Sungnam; (Suwon-si,
KR) ; YUN; Yeohun; (Hwaseong-si, KR) ; KIM;
Chanhong; (Suwon-si, KR) ; KIM; Taeyoung;
(Seoul, KR) ; SEOL; Jiyun; (Seongnam-si, KR)
; LIM; Jongbu; (Seoul, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Samsung Electronics Co., Ltd. |
Suwon-si |
|
KR |
|
|
Family ID: |
63038221 |
Appl. No.: |
15/887376 |
Filed: |
February 2, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L 5/0044 20130101;
H04L 5/00 20130101; H04W 72/0446 20130101; H04W 72/1236 20130101;
H04W 72/12 20130101; H04L 5/0007 20130101; H04L 5/0053
20130101 |
International
Class: |
H04W 72/04 20060101
H04W072/04; H04W 72/12 20060101 H04W072/12 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 3, 2017 |
KR |
10-2017-0015798 |
Mar 23, 2017 |
KR |
10-2017-0036765 |
Claims
1. A method for transmitting heterogeneous service data from a base
station, the method comprising: transmitting, using a transmitter
of the base station, a first service data by allocating a first
resource through scheduling the first service data to be
transmitted to a first terminal; identifying, using at least one
processor of the base station, whether a second service data to be
transmitted to the first terminal or a second terminal is generated
using at least some of the first resource during a transmission of
the first service data to the first terminal; transmitting, using
the transmitter of the base station, the second service data by
allocating the second service data to at least some of the first
resource if the second service data is generated; and configuring
and transmitting the second service data to notify and indicate the
transmission of the second service data at an indication
information transmission time of a time closest to a transmission
time of the second service data among next times including the
transmission time of the second service data.
2. The method of claim 1, wherein the first service data is an
enhanced mobile broadband (eMBB) service data, and the second
service data is an ultra-reliable and low latency communication
(URLLC) service data.
3. The method of claim 1, wherein when the second service data is
allocated to at least some of the first resource, the first service
data is punctured from the resource transmitting the second service
data, wherein the first resource is allocated one slot unit
including at least two mini slots, and the second service data is
transmitted using at least one of the mini slots, and wherein
indication information is transmitted in at least one of: units of
each mini slot, units of a plurality of mini slots, or a slot
unit.
4. A base station apparatus for transmitting heterogeneous service
data, the base station comprising: a first service data generator
configured to generate a first service data to be transmitted to a
first terminal based on scheduling information; a second service
data generator configured to generate a second service data to be
transmitted to the first terminal or a second terminal; a frame
configuration unit configured to form a first data generated from
the first service data generator and a second data generated from
the second service data generator as one frame; a radio transmitter
configured to transmit the data generated from the frame
configuration unit as a signal in a transmission band; and at least
one processor configured to: control to allocate a first resource
by scheduling to provide the first service data to the first
terminal, identify whether the second service data to be
transmitted to the first terminal or the second terminal is
generated using at least some of the first resource during the
transmission of the first service data to the first terminal using
the first resource, transmit the second service data by allocating
the second service data to at least some of the first resource if
the second service data is generated, and configure and transmit
the second service data to notify the transmission of the second
service data at an indication information transmission time of a
time closest to a transmission time of the second service data
among next times including the transmission time of the second
service data.
5. The base station apparatus of claim 4, wherein the first service
data is an enhanced mobile broadband (eMBB) service data, and the
second service data is an ultra-reliable and low latency
communication (URLLC) service data.
6. The base station apparatus of claim 4, wherein the first
resource is allocated one slot unit including at least two mini
slots, and wherein the at least one processor is further configured
to: control to puncture the first service data from the resource
transmitting the second service data when the second service data
is allocated to at least some of the first resource, and control to
transmit the second service data using at least one of the mini
slots.
7. The base station apparatus of claim 4, wherein indication
information is transmitted in at least one of: units of each mini
slot, units of a plurality of mini slots, or a slot unit.
8. A method for receiving, by a terminal, a service data, the
method comprising: receiving, using a receiver of the terminal, a
first service data through a scheduled first resource; detecting,
using at least one processor of the terminal, indication
information indicating whether to transmit a second service data in
the first resource; identifying, using the at least one processor
of the terminal, whether to transmit the second service data using
the indication information; detecting, using the at least one
processor of the terminal, the second service data when the second
service data is transmitted through the first resource; and
puncturing, using the at least one processor of the terminal, the
second service data and decoding only the received first service
data.
9. The method of claim 8, wherein the first service data is an
enhanced mobile broadband (eMBB) service data, and the second
service data is an ultra-reliable and low latency communication
(URLLC) service data.
10. The method of claim 8, wherein the indication information is
received in at least one of: units of each mini slot, units of a
plurality of mini slots, or a slot unit, and includes information
capable of estimating at least one location of a time resource or a
frequency resource of the second service data, and wherein the
first resource is received one slot unit including at least two
mini slots, and the second service data is received through at
least one of the mini slots.
11. A terminal apparatus for receiving data, the terminal apparatus
comprising: a wireless receiver configured to convert a radio
signal received through a set band into a baseband signal; and a
communication processor configured to: receive data through a first
resource allocated to the terminal, detect indication information
indicating whether to transmit a second service data in the first
resource, identify whether to transmit the second service data
using the indication information, detect the second service data
when the second service data is transmitted through the first
resource, and puncture the second service data and decode only the
received first service data.
12. The terminal apparatus of claim 11, wherein the first service
data is an enhanced mobile broadband (eMBB) service data, and the
second service data is an ultra-reliable and low latency
communication (URLLC) service data.
13. The terminal apparatus of claim 11, wherein the indication
information is received in at least one of: units of each mini
slot, units of a plurality of mini slots, or a slot unit, and
includes information capable of estimating at least one location of
a time resource or a frequency resource of the second service data,
and wherein the first resource is received one slot unit including
at least two mini slots, and the second service data is received
through at least one of the mini slots.
14. A method for transmitting heterogeneous service data from a
base station, the method comprising: transmitting, using a
transmitter of the base station, a first service data to be
transmitted to a first terminal by scheduling by allocating the
first service data to a first resource; transmitting, using the
transmitter of the base station, a second service data of the same
kind as the first service data to be transmitted to a second
terminal by allocating the second service data to a second resource
through scheduling; identifying, using at least one processor of
the base station, whether a third service data of a kind different
from a first service data to be transmitted to the first terminal
is generated using at least some of the first resource during a
transmission of the first service data to the first terminal;
transmitting, using the transmitter of the base station, the third
service data by allocating the third service data to at least some
of the first resource if the third service data is generated;
identifying, using the at least one processor of the base station,
whether a fourth service data of a kind different from the second
service data to be transmitted to the second terminal is generated
using at least some of the second resource during the transmission
of the second service data to the second terminal; transmitting,
using the transmitter of the base station, the fourth service data
by allocating the fourth service data to at least some of the
second resource if the fourth service data is generated;
transmitting, using the transmitter of the base station, first
indication information by configuring the first indication
information notifying a transmission of the third service at an
indication information transmission time closest to a transmission
time of the third service data among next times including the
transmission time of the third service data in the first resource
scheduled to transmit the first service data, and transmitting,
using the transmitter of the base station, second indication
information by configuring the second indication information
notifying a transmission of the fourth service at an indication
information transmission time closest to a transmission time of the
fourth service data among next times including the transmission
time of the fourth service data in the second resource scheduled to
transmit the second service data.
15. The method of claim 14, wherein the first service data and the
second service data are an enhanced mobile broadband (eMBB) service
data, and the third service data and the fourth service data are an
ultra-reliable and low latency communication (URLLC) service data,
and wherein indication information is transmitted in at least one
of: units of each mini slot, units of a plurality of mini slots, or
a slot unit.
16. The method of claim 15, wherein when there is no transmission
of the third service data or the fourth service data, the
indication information is not transmitted at a transmission time of
the indication information.
17. The method of claim 15, wherein the first indication
information determines at least one of: a channel encoding rate, a
modulation method, a length of a sequence for mapping the
indication information, or a resource amount allocated for the
transmission of the indication information depending on channel
environment between the first terminal and the base station, and
wherein the second indication information determines at least one
of: a channel encoding rate, a modulation method, a length of a
sequence for mapping the indication information, or a resource
amount allocated for the transmission of the indication information
depending on channel environment between the second terminal and
the base station.
18. The method of claim 17, wherein the channel encoding rate, the
modulation method, the length of the sequence for mapping the
indication information, and the resource amount allocated for the
transmission of the indication information for the first indication
information and the second indication information, respectively,
are determined in advance when the resource of the first service
data is allocated and the resource of the third service data is
allocated.
19. The method of claim 18, further comprising: transmitting the
channel encoding rate, the modulation method, the length of the
sequence for mapping the indication information, and the resource
amount allocated for the transmission of the indication information
for the first indication information and the second indication
information, respectively, to the first terminal and the second
terminal, respectively.
20. The method of claim 19, wherein the first indication
information and the second indication information group the channel
encoding rate and the modulation method to be applied to the first
service data and the third service data into a predefined group,
and are mapped to the channel encoding rate, the modulation method,
the length of the sequence for mapping the indication information,
and the resource amount allocated for the transmission of the
indication information for the first indication information and the
second indication information one to one.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)
[0001] This application is based on and claims priority under 35
U.S.C. .sctn. 119 to Korean Patent Application Nos.
10-2017-0015798, filed on Feb. 3, 2017 in the Korean Intellectual
Property Office, and under 35 U.S.C. .sctn.119 to Korean patent
application 10-2017-0036765 filed on Mar. 23, 2017 in the Korean
Intellectual Property Office, the disclosure of each of which is
incorporated by reference herein in its entirety.
TECHNICAL FIELD
[0002] The present disclosure relates to an apparatus and method
for transmitting/receiving data in a wireless communication system.
More particularly, the present disclosure relates to an apparatus
and a method for transmitting/receiving data for providing
heterogeneous service data in a wireless communication system.
BACKGROUND
[0003] To meet a demand for radio data traffic that is on an
increasing trend since commercialization of a fourth generation
(4G) communication system, efforts to develop an improved fifth
generation (5G) communication system or a pre-5G communication
system have been conducted. For this reason, the 5G communication
system or the pre-5G communication system is called a beyond 4G
network communication system or a post long term evolution (LTE)
system.
[0004] To achieve a high data transmission rate, the 5G
communication system is considered to be implemented in a very high
frequency (mmWave) band (e.g., like 60 GHz band). To relieve a path
loss of a radio wave and increase a transfer distance of the radio
wave in the mmWave band, in the 5G communication system,
beamforming, massive multiple input and multiple output (MIMO),
full dimensional MIMO (FD-MIMO), array antenna, analog
beam-forming, and large scale antenna technologies have been
discussed.
[0005] Further, to improve a network of the system, in the 5G
communication system, technologies such as an evolved small cell,
an advanced small cell, a cloud radio access network (cloud RAN),
an ultra-dense network, a device to device communication (D2D), a
wireless backhaul, a moving network, cooperative communication,
coordinated multi-points (CoMP), and reception interference
cancellation have been developed.
[0006] In addition to this, in the 5G system, hybrid
frequency-shift keying (FSK) and quadrature amplitude modulation
(QAM) modulation (FQAM) and sliding window superposition coding
(SWSC) that are an advanced coding modulation (ACM) scheme and a
filter bank multi carrier (FBMC), a non-orthogonal multiple access
(NOMA), and a sparse code multiple access (SCMA) that are an
advanced access technology, and so on have been developed.
[0007] The 5G system has considered a support for various services
compared to the existing 4G system based on various types of
technological developments. For example, the most representative
services are an enhanced mobile broadband (eMBB) communication
service, an ultra-reliable and low latency communication (URLLC)
service, a massive machine type communication (mMTC) service, an
evolved multimedia broadcast/multicast service (eMBMS), and the
like. Unlike the existing 4G system, the URLLC service is a service
that is newly considered in the 5G system and need to satisfy
ultra-high reliability (packet error rate of 10-5) and low latency
(0.5 msec) conditions, compared to other services. In order to
satisfy the strict requirements, the URLLC service needs to apply a
transmission time interval (TTI) shorter than the eMBB service, and
various operating methods utilizing the TTI have been
considered.
[0008] For example, it is possible to consider a scenario in which
the eMBB service is operated by being scheduled based on the eMBB
TTI in the downlink network environment and the URLLC service is
operated by being scheduled based on the TTI shorter than the eMBB
TTI. In this case, the base station may transmit the URLLC packet
while transmitting the eMBB service packet. As such, when the URLLC
packet needs to be transmitted during the transmission of the eMBB
service packet, some of the resources allocated to the eMBB service
need to be allocated to provide the URLLC service instead of the
eMBB service data due to the characteristics of the URLLC service.
As described above, when some of the resources allocated to the
eMBB service in advance are allocated to provide the URLLC service
instead of the eMBB service data, there may be a problem in that
the terminal receiving the eMBB service processes the URLLC service
data by recognizing the URLLC service data as the eMBB service
data. Therefore, the data reception performance of the terminal
receiving the eMBB service may seriously deteriorate.
[0009] The above information is presented as background information
only to assist with an understanding of the present disclosure. No
determination has been made, and no assertion is made, as to
whether any of the above might be applicable as prior art with
regard to the present disclosure.
SUMMARY
[0010] Aspects of the present disclosure are to address at least
the above-mentioned problems and/or disadvantages and to provide at
least the advantages described below. Accordingly, aspects of the
present disclosure are directed to the provision of an apparatus
and a method for efficiently allocating resources when
heterogeneous services having different characteristics are
provided in a wireless communication system.
[0011] Embodiments of the present disclosure are directed to the
provision of an apparatus and a method for increasing reception
efficiency of data when heterogeneous services having different
characteristics are provided in a wireless communication
system.
[0012] Embodiments of the present disclosure are directed to the
provision of an apparatus and a method for explicitly/implicitly
providing resource allocation information to each service when
heterogeneous services having different characteristics are
provided in a wireless communication system.
[0013] Embodiments of the present disclosure are directed to the
provision of the provision of an apparatus and a method for
efficient decoding by explicitly/implicitly using resource
allocation information to each service when heterogeneous services
having different characteristics are provided in a wireless
communication system.
[0014] Embodiments of the present disclosure are directed to the
provision of an apparatus and a method for recognizing resources
allocated to each service when heterogeneous services having
different characteristics are provided in a wireless communication
system.
[0015] In accordance with an aspect of the present disclosure, a
method for transmitting heterogeneous service data from a base
station which is a method for transmitting data is provided. The
method includes transmitting a first service data by allocating a
first resource through scheduling the first service data to be
transmitted to a first terminal, identifying whether a second
service data to be transmitted to the first terminal or a second
terminal is generated using at least some of the first resource
during a transmission of the first service data to the first
terminal, transmitting the second service data by allocating the
second service data to at least some of the first resource if the
second service data is generated, and configuring and transmitting
the second service data to notify and indicate the transmission of
the second service data at an indication information transmission
time of a time closest to a transmission time of the second service
data among next times including the transmission time of the second
service data.
[0016] In accordance with another aspect of the present disclosure,
a base station apparatus for transmitting heterogeneous service
data which is an apparatus for transmitting data is provided. The
base station includes a first service data generator configured to
generate a first service data to be transmitted to a first terminal
based on scheduling information, a second service data generator
configured to generate a second service data to be transmitted to
the first terminal or a second terminal, a frame configuration unit
configured to form a first data generated from the first service
data generator and a second data generated from the second service
data generator as one frame, a radio transmitter configured to
transmit the data generated from the frame configuration unit as a
signal in a transmission band, and a controller configured to
control to allocate a first resource by scheduling to provide the
first service data to the first terminal, identify whether the
second service data to be transmitted to the first terminal or the
second terminal is generated using at least some of the first
resource during the transmission of the first service data to the
first terminal using the first resource, transmit the second
service data by allocating the second service data to at least some
of the first resource if the second service data is generated, and
configure and transmit the second service data to notify the
transmission of the second service data at an indication
information transmission time of a time closest to a transmission
time of the second service data among next times including the
transmission time of the second service data.
[0017] In accordance with another aspect of the present disclosure,
a method for receiving, by a terminal, a service data which is a
method for receiving data is provided. The method includes
receiving a first service data through a scheduled first resource,
detecting indication information indicating whether to transmit a
second service data in the first resource, identifying whether to
transmit the second service data using the indication information,
detecting the second service data when the second service data is
transmitted through the first resource, and puncturing the second
service data and decoding only the received first service data.
[0018] In accordance with another aspect of the present disclosure,
a terminal apparatus for receiving data which is an apparatus for
receiving data is provided. The terminal apparatus includes a
wireless receiver configured to convert a radio signal received
through a set band into a baseband signal, and a communication
processor configured to receive data through a first resource
allocated to the terminal, detect indication information indicating
whether to transmit a second service data in the first resource,
identify whether to transmit the second service data using the
indication information, detect the second service data when the
second service data is transmitted through the first resource, and
puncture the second service data and decode only the received first
service data.
[0019] In accordance with another aspect of the present disclosure,
a method for transmitting heterogeneous service data from a base
station is provided. The method includes transmitting a first
service data to be transmitted to a first terminal by scheduling by
allocating the first service data to a first resource, transmitting
a second service data of the same kind as the first service data to
be transmitted to a second terminal by allocating the second
service data to a second resource through scheduling, identifying
whether a third service data of a kind different from a first
service data to be transmitted to the first terminal is generated
using at least some of the first resource during a transmission of
the first service data to the first terminal, transmitting the
third service data by allocating the third service data to at least
some of the first resource if the third service data is generated,
identifying whether a fourth service data of a kind different from
the second service data to be transmitted to the second terminal is
generated using at least some of the second resource during the
transmission of the second service data to the second terminal,
transmitting the fourth service data by allocating the fourth
service data to at least some of the second resource if the fourth
service data is generated, transmitting first indication
information by configuring the first indication information
notifying a transmission of the third service at an indication
information transmission time closest to a transmission time of the
third service data among next times including the transmission time
of the third service data in the first resource scheduled to
transmit the first service data, and transmitting second indication
information by configuring the second indication information
notifying a transmission of the fourth service at an indication
information transmission time closest to a transmission time of the
fourth service data among next times including the transmission
time of the fourth service data in the second resource scheduled to
transmit the second service data.
[0020] According to the embodiment of the present disclosure, it is
possible to efficiently allocate resources when the heterogeneous
services having different characteristics are provided in the
wireless communication system and recognize resources allocated to
each service based on the allocated resources. Also, according to
the embodiment of the present disclosure, it is possible to
increase the transmission/reception efficiency of data when the
heterogeneous services having different characteristics are
provided in the wireless communication system. In addition,
according to the embodiment of the present disclosure, it is
possible to explicitly/implicitly provide the resource allocation
information to each service when the heterogeneous services having
different characteristics are provided in the wireless
communication system and perform the efficient decoding using the
explicitly / implicitly provided resource allocation
information.
[0021] Other aspects, advantages, and salient features of the
disclosure will become apparent to those skilled in the art from
the following detailed description, which, taken in conjunction
with the annexed drawings, discloses various embodiments of the
present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The above and other aspects, features, and advantages of
certain embodiments of the present disclosure will be more apparent
from the following description taken in conjunction with the
accompanying drawings, in which:
[0023] FIG. 1A is a diagram for explaining a resource allocation
unit in an enhanced mobile broadband (eMBB) service in a fifth
generation (5G) wireless communication system according to an
embodiment of the present disclosure;
[0024] FIG. 1B is a diagram illustrating a case in which an
ultra-reliable and low latency communication (URLLC) service is
allocated to a resource allocation area of the eMBB service
according to an embodiment of the present disclosure;
[0025] FIG. 2 is a frame structure diagram including indication
information for indicating a second service data transmission when
the second service data is transmitted in some of a first service
data area according to an embodiment of the present disclosure;
[0026] FIGS. 3A, 3B, 3C, and 3D are diagrams for transmitting
indication information in a specific cell or a base station
according to another embodiment of the present disclosure;
[0027] FIGS. 4A, 4B, 4C, and 4D are diagrams for transmitting
indication information in a specific cell or a base station
according to another embodiment of the present disclosure;
[0028] FIG. 5A is a diagram for explaining a case in which a
frequency band for transmitting indication information is set as
the same frequency band for each base station or each cell
according to an embodiment of the present disclosure;
[0029] FIG. 5B is a diagram for explaining a case in which a
frequency band for transmitting indication information is set as
different frequency bands for each base station or each cell
according to an embodiment of the present disclosure;
[0030] FIGS. 6A, 6B, 6C, 6D are diagrams for transmitting
indication information based on a resource allocated to a receiving
terminal according to another embodiment of the present
disclosure;
[0031] FIGS. 7A, 7B, 7C, and 7D are diagrams for transmitting
indication information based on a resource allocated to a receiving
terminal according to another embodiment of the present
disclosure;
[0032] FIGS. 8A, 8B, and 8C are diagrams illustrating a method of
transmitting indication information in a case in which a sequence
length is 4 according to an embodiment of the present
disclosure;
[0033] FIG. 9 is a frame structure diagram including indication
information for indicating a second service data transmission when
the second service data is transmitted in some of a first service
data area according to another embodiment of the present
disclosure;
[0034] FIGS. 10A and 10B are diagrams for explaining a case of
applying a fixed phase-shifted quadrature amplitude modulation
(QAM) constellation according to an embodiment of the present
disclosure;
[0035] FIG. 11 is a block configuration diagram of a base station
apparatus according to an embodiment of the present disclosure;
[0036] FIG. 12 is a block configuration diagram of a receiving
terminal according to an embodiment of the present disclosure;
[0037] FIG. 13 is a control flowchart for transmitting a first
service data and a second service data in the base station
according to an embodiment of the present disclosure;
[0038] FIG. 14 is a control flowchart for receiving a first service
data and a second service data in the receiving terminal according
to an embodiment of the present disclosure; and
[0039] FIGS. 15A and 15B are simulation result graphs according to
an embodiment of the present disclosure.
[0040] Throughout the drawings, it should be noted that like
reference numbers are used to depict the same or similar elements,
features, and structures.
DETAILED DESCRIPTION
[0041] The following description with reference to the accompanying
drawings is provided to assist in a comprehensive understanding of
various embodiments of the present disclosure as defined by the
claims and their equivalents. It includes various specific details
to assist in that understanding but these are to be regarded as
merely exemplary. Accordingly, those of ordinary skill in the art
will recognize that various changes and modifications of the
various embodiments described herein can be made without departing
from the scope and spirit of the present disclosure. In addition,
descriptions of well-known functions and constructions may be
omitted for clarity and conciseness.
[0042] The terms and words used in the following description and
claims are not limited to the bibliographical meanings, but, are
merely used by the inventor to enable a clear and consistent
understanding of the present disclosure. Accordingly, it should be
apparent to those skilled in the art that the following description
of various embodiments of the present disclosure is provided for
illustration purpose only and not for the purpose of limiting the
present disclosure as defined by the appended claims and their
equivalents.
[0043] It is to be understood that the singular forms "a," "an,"
and "the" include plural referents unless the context clearly
dictates otherwise. Thus, for example, reference to "a component
surface" includes reference to one or more of such surfaces.
[0044] Prior to describing the present disclosure, a fifth
generation (5G or new radio) wireless communication system will be
briefly described. The 5G wireless communication system has a band
even wider than that of the existing third generation (3G) and
fourth generation (4G or long term evolution (LTE) or LTE-advanced
(LTE-A)) wireless communication systems. In addition, the existing
3G and fourth generation (4G or LTE or LTE-A) wireless
communication systems need to be considered to support backward
compatibility when defining standard protocols, but the 5G wireless
communication system defines standard protocols in consideration of
forward compatibility. According to the policy of the standard
protocols, the 5G wireless communication system defines a use case
for three services largely. The three services defined in the 5G
generation wireless communication system are as follows.
[0045] First, there is an enhanced mobile broadband (eMBB) service
based on the enhanced transmission rate. Second, there is, as an
enhanced machine type communication (eMTC) service based on a large
scale Internet of Things, a data communication service capable of
acquiring and transmitting necessary information anytime and
anywhere by wirelessly connecting without a direct operation or
intervention of a person. Finally, there is an ultra-reliable low
latency communication (URLLC) service based on ultra-low latency
and high reliability.
[0046] For convenience of explanation, in the following description
of the above-mentioned services, the data communication service
based on the enhanced transmission rate which is the first service
will be described using one of `data communication`, `data
communication service`, `eMBB`, `eMBB service` and `eMBB
communication service`. Here, even though the respective terms are
used interchangeably, they should be understood as the same
meaning
[0047] The communication service based on the large scale Internet
of Things which is the second service will be described using one
of the `Internet of Things`, `Internet of Things service`, `eMTC
communication`, `eMTC communication service`, and `eMTC service`.
Here, even if the respective terms are used interchangeably, they
should be understood as the same meaning
[0048] In addition, the Internet of things communication service
based on the ultra-low latency and high reliability which is the
third service will be described using one of `ultra-low latency
service`, `high reliability service`, `ultra-low latency
communication`, `high reliability communication`, `ultra-low
latency and high reliability Internet of things communication`,
`ultra-low latency and high reliability Internet of things
communication service`, `URLLC`, `URLLC communication`, `URLLC
service`, and `URLLC communication service`. Here, the respective
terms are used interchangeably, they should be understood as the
same meaning
[0049] Hereinafter, resources to which an eMBB service and a URLLC
service are provided will be described with reference to FIGS. 1A
and 1B.
[0050] FIG. 1A is a diagram for describing a resource allocation
unit in an eMBB service in a 5G wireless communication system
according to an embodiment of the present disclosure, and FIG. 1B
is a diagram for describing a case in which a URLLC service is
allocated to a resource allocation area of an eMBB service
according to an embodiment of the present disclosure.
[0051] Referring to FIG. 1A, a horizontal axis is a time resource
and a vertical axis is a frequency resource. In the wireless
communication system, the allocation of resources may be allocated
in a frequency resource unit and a time resource unit. In FIGS. 1A
and 1B, it is assumed that a predetermined frequency band or a
predetermined number of frequency resources are allocated in the
frequency resource unit. At this time, the time resources may be
allocated in the same form or different forms according to each
service in the 5G generation wireless communication system. The
case in which a time resource is allocated to an eMBB service will
be described with reference to FIG. 1A. A unit for allocating time
resources in the eMBB service, that is, a transmission time
interval (TTI), is units of a long TTI 100. The long TTI for
allocating the time resource to the eMBB service includes an
interval in which an eMBB control channel 110 for transmitting
control information is transmitted and a short TTI or mini slot 120
in which an eMBB service data is transmitted.
[0052] FIG. 1B is a diagram for describing resources to which an
eMBB service and a URLLC service are provided according to an
embodiment of the present disclosure.
[0053] Referring to FIG. 1B, an eMBB service resource and a URLLC
service resource will be compared with each other. Even in FIG. 1B,
it is assumed that a predetermined frequency band or a
predetermined number of frequency resources are allocated in the
frequency resource unit as described above. In this case, resources
are allocated to the eMBB service resources in units of the long
TTI 100 as described above. The long TTI 100 includes an interval
in which an eMBB control channel 110 for transmitting control
information is transmitted and an interval in which an eMBB service
data 140 is transmitted. In addition, the URLLC service may be
allocated resources in a time interval unit of a short TTI or mini
slot 120 instead of the unit of the long TTI 100. The mini slot 120
in which data is transmitted in the long TTI 100 may include a time
interval unit of at least two mini slot TTIs 120. FIG. 1B
illustrates a form including three short TTIs 141, 142, and 143.
However, a data transmission interval of the long TTI 100 may be
configured to include a larger number of short TTIs than three
short TTIs illustrated in FIG. 1B, or include a smaller number of
short TTIs than three short TTIs.
[0054] Hereinafter, it will be described that the respective
services are allocated with reference to the above-mentioned FIGS.
1A and 1B. As described above, when the wireless communication
system provides an eMBB service to a specific terminal, resources
may be allocated in units of an eMBB TTI, that is, the units of the
long TTI 100. Therefore, as described with reference to FIG. 1A,
one eMBB TTI may be divided into an eMBB control channel 110 and an
eMBB service data 140 for transmitting control information. The
base station inserts control information necessary for receiving
data in a terminal receiving the eMBB service data 140 in the eMBB
control channel 110 and transmits the inserted control information.
Accordingly, the eMBB receiving terminal may first receive the eMBB
control channel 110, and demodulate and decode the eMBB service
data 140 based on the information included in the eMBB control
channel 110.
[0055] On the other hand, the URLLC data is data requiring
ultra-low latency and high reliability. Therefore, when the URLLC
data is generated in a burst, it should be urgently transmitted.
Therefore, as illustrated in FIG. 1B, resources should be allocated
in units of a very short TTI, and data should be transmitted as
soon as they are generated. Since data should be transmitted in the
units of the very short TTI, frequency resources that can transmit
available frequency resources, for example, URLLC data may be
allocated to other all terminals in advance. In this case, when
considering priority between the eMBB service and the URLLC
service, the URLLC service has higher priority. Therefore, it is
necessary to transmit the URLLC data by allocating resources
necessary for the URLLC service by using some of the resources
already allocated to the eMBB service.
[0056] FIG. 1B illustrates a case in which some of the eMBB
resources allocated to a specific terminal are allocated to
transmit URLLC data. That is, the case in which some of the eMBB
resources of long TTI 100 allocated to the specific terminal are
used to transmit the URLLC data is the case in which the area of
eMBB service data 140 is filled with eMBB data to be already
transmitted to the corresponding terminal. Therefore, the base
station may puncture or remove data allocated to some of the
resources in the area of eMBB service data 140, and may insert a
URLLC data 131 into the punctured location and transmit the
inserted URLLC data 131. As described above, when the base station
punctures or removes the data allocated to some of the resources in
the area of eMBB service data 140 and inserts the URLLC data 131
into the punctured location and transmits the inserted URLLC data
131, the receiving terminal receiving the eMBB service may transmit
other data by including the other data in the received data,
instead of the data of the receiving terminal.
[0057] When the receiving terminal receiving the eMBB service
receives the URLLC data to be transmitted to other terminals within
the long TTI 100 allocated to the receiving terminal, the receiving
terminal performs demodulation and decoding the URLLC data instead
of its own data. The receiving terminal requests a retransmission
to the base station when failing to perform the demodulation and
decoding. In addition, when using a hybrid automatic repeat request
(HARQ) scheme for combining and demodulating received data, the
receiving terminal may perform the decoding by recognizing wrong
data as its own data and thus may request more retransmissions than
usual cases. As a result, since many retransmissions are required
in the system due to the burst type URLLC data, there may be the
problem in that a waste of the band may be caused and a waste of
unnecessary power may be caused in the terminal.
[0058] Therefore, the present disclosure described below describes
a technology for providing an apparatus and a method for
recognizing, by an eMBB receiving terminal, a URLCC service
provided by using some of the resources allocated to the eMBB
service as illustrated in FIG. 1B. That is, the present disclosure
will describe an apparatus and a method for indicating, by a
receiving terminal of a first service, a case in which there are
heterogeneous services and a second service data is transmitted
together using some of resources allocated to the first service.
The indication method may perform an explicit/implicit indication.
In addition, an apparatus and a method for increasing processing
efficiency of received data by allowing a receiving terminal to use
explicitly or implicitly indicated information will be
described.
[0059] In addition, in the present disclosure described below,
various forms of examples for utilizing indication information,
various forms for transmitting indication information, and the like
will be described. In addition, in the present disclosure described
below, methods for utilizing, by a receiver, these forms will be
described.
Method for Transmitting Indication Information
[0060] Hereinafter, when there are different types of heterogeneous
services and the second service data is allocated to at least some
of the resources to transmit the first service data and the second
service data together by using the first service resource, an
allocation location and a frame structure of the indication
information for indicating that the second service data is included
will be described.
[0061] FIG. 2 is a frame structure diagram including indication
information for indicating a second service data transmission when
the second service data is transmitted in some of a first service
data area according to an embodiment of the present disclosure.
[0062] Referring to FIG. 2, the first service may be the eMBB
service and the second service may be the URLLC service. Therefore,
in the embodiment of FIG. 2, the first service is assumed to be the
eMBB service, and the second service is assumed to be the URLLC
service. However, it is obvious that the present disclosure may be
similarly applied to a service having different names even if the
service has the characteristics of the first service and the
characteristics of the second service. The first service is a
general data service, and may be a service in which resources are
allocated in advance and data is transmitted using the allocated
resources. In addition, the second service may be a burst type data
service requiring ultra-low latency and high reliability.
[0063] Referring to FIG. 2, the horizontal axis is a time resource
and the vertical axis is a frequency resource, as illustrated in
FIGS. 1A and 1B. The frequency resource on the vertical axis may be
the entire frequency band that may be used or allocated in the 5G
wireless communication system or may be a transmission/reception
bandwidth of a specific terminal.
[0064] Further, in FIG. 2, one slot (e.g., a long TTI 100) and a
mini slot 120 are illustrated, in which one slot may be a long TTI
which is a transmission time unit of one first service described in
FIGS. 1A and 1B and the mini slot 120 may be a short TTI.
[0065] FIG. 2 illustrates an example in which one slot (long TTI
100) consists of seven mini slots. One or more orthogonal
frequency-division multiplexing (OFDM) symbol may be included in
one mini slot 120. In the embodiment of the present disclosure, a
description will be made on the assumption that two OFDM symbols
are included in one mini slot 120. In addition, in FIG. 2, an eMBB
#1 resource 201 allocated to the first terminal and an eMBB #2
resource 202 allocated to the second terminal are illustrated. The
base station may transmit data using a frequency resource band in
which the eMBB #1 resource 201 allocated to the first terminal and
the eMBB #2 resource 202 allocated to the second terminal are each
allocated in the entire time interval within the slot (long TTI
100). At this time, as described with reference to FIG. 1B, there
may occur a case in which a transmission of a burst type second
service, that is, a URLLC data 131 is required in a specific time
domain. As illustrated in FIG. 2, the URLLC data 131 may be
transmitted using some of resources of the eMBB #1 resource 201
allocated to the first terminal and the eMBB #2 resource 202
allocated to the second terminal. As another example, when there is
a smaller amount of URLLC service data, the URLLC data 131 may be
transmitted using only some of the resources of the eMBB #1
resource 201 allocated to the first terminal, or may be transmitted
using only some of the resources of the eMBB #2 resource 202
allocated to the second terminal.
[0066] Also, in the embodiment of the present disclosure, a
plurality of mini slots included within one slot (long TTI 100) may
be configured as one group. FIG. 2 illustrates the example in which
each three mini slots in the remaining six mini slots other than a
first mini slot in which control information of the first service
is transmitted configures one group. Therefore, except for the
first mini slot including the control channel for the first service
data transmission, within the slot (long TTI 100), a second mini
slot to a fourth mini slot are defined as one mini slot group 210
and a fifth mini slot to a seventh mini slot are defined as another
mini slot group 220. As described above, within one slot (long TTI
100), the mini slots are divided in a group unit and it can be
notified whether to transmit the second service within each
group.
[0067] In the embodiment of FIG. 2 according to the present
disclosure, to notify whether there is the URLLC service data
within one slot, the indication information may be transmitted to a
preset time and a location of a frequency resource like reference
numerals 211, 212, 213, 214, 221, 222, 223, and 224 so that it may
be transmitted by group of each mini slot. At this time, reference
numerals 211, 212, 213, 214, 221, 222, 223, and 224 may be a preset
location.
[0068] In FIG. 2, when the indication information is transmitted,
the indication information may be configured to be transmitted by
fixing a location in advance so that all terminals within a cell
may receive the indication information in the same area in
consideration of complexity of decoding upon the decoding of the
eMBB service terminal. That is, it may be configured to be
transmitted at the same location without the location being changed
every slot. In this way, the base station transmitting data may
more conveniently configure data to be transmitted, and the
receiving terminal may always confirm whether there is the second
service, that is, the URLLC service data at the same location.
[0069] Also, a large amount of indication information is not
required because the indication information only should notify
whether there is the second service data, that is, the URLLC
service data. Therefore, the indication information may consist of
one bit and may be transmitted. Also, to reduce the decoding
complexity of the terminal, on/off information of the indication
information may be configured to be transmitted in advance as
higher signaling or higher layer information from the base station.
The on/off information of the indication information will be
described in more detail below. Also, since the location of the
indication information is set in advance, the base station may
perform rate matching in advance when the first service data, that
is, the eMBB service data is configured. In addition, a method for
transmitting, by a base station, only first service data without
transmitting the indication information at the location or resource
set to transmit the indication information when there is no second
service may be applied. As described above, when the indication
information is not transmitted, that is, the resource is not
allocated to the indication information, the base station may
perform the rate matching without considering the location of the
indication information. However, the receiving terminal may always
attempt to detect the detection of the indication information at
the location where the indication information of the second service
data is transmitted. When the base station or the cell notifies in
advance that the indication information of the second service data
is not transmitted through a specific upper message or signaling,
it may not attempt to detect the indication information while the
higher message or the signaling is valid.
[0070] If it is not informed in advance through the signaling or
the like, the receiving terminal should always attempt to detect
the indication information at the location of the indication
information transmission resource for notifying whether there is
the second service. At this time, if it is detected that there is
no indication information, there may be the case that the
indication information consists of only the first service data and
transmitted. In addition, the base station or the cell may allocate
the indication information to the resource of the indication
information only when the second service data is generated, and
notify the receiving terminal that the second service data is first
transmitted together with the indication information and then the
second service data is transmitted by using the indication
information resource at the earliest time.
[0071] Also, as illustrated in FIG. 2, one or more mini slot(s) may
be configured of one group to provide the indication information on
whether there is the second service data for each group, such that
the receiving terminal may improve eMBB decoding latency. In
addition, since the terminal receiving the first service data can
perform channel decoding on a coding block (CB) in a group unit
based on the indication information included in the group of the
mini slot, the decoding latency can be minimized. As the decoding
latency is reduced, the terminal may reduce a use of an additional
memory (buffer), such that the complexity and power consumption of
the terminal can be reduced.
[0072] Another embodiment according to the present disclosure based
on the above-mentioned method will be described.
[0073] FIGS. 3A to 3D are diagrams for transmitting indication
information in a specific cell or a base station according to
another embodiment of the present disclosure.
[0074] Referring to FIGS. 3A to 3D, a horizontal axis represents a
time resource and a vertical axis represents a frequency resource.
The frequency resource on the vertical axis may be the entire
frequency band that may be used or allocated in the 5G wireless
communication system or may be a transmission/reception bandwidth
of a specific terminal Generally, the entire band of the 5G
wireless communication system is a very wide band. Therefore, it is
unreasonable for the terminal to search for the entire band of the
5G wireless communication system in consideration of the power
consumption of the terminal and the like, and therefore the
following description will be made under the assumption that the
vertical axis represents a transmitting/receiving band that the
terminal searches for or can search for. Also, the same reference
numerals are used for the same parts of the reference numerals used
in the drawings described above.
[0075] Prior to describing FIG. 3A, FIGS. 3A and 3B illustrate a
case in which one slot (long TTI 100) consists of seven mini slots
as described above. It is assumed that mini slot 120 may include at
least one OFDM symbol, and one mini slot 120 may include two OFDM
symbols as described above. In addition, FIG. 3A also illustrates
an eMBB #1 resource 201 allocated to the first terminal and an eMBB
#2 resource 202 allocated to the second terminal. Here, each eMBB
service data may be first service data. The base station may
transmit data using a frequency resource band in which the eMBB #1
resource 201 allocated to the first terminal and the eMBB #2
resource 202 allocated to the second terminal are each allocated in
the entire time interval within the slot (long TTI 100).
[0076] In the example of FIG. 3A, a resource of a specific
frequency band in the entire frequency band or the
transmission/reception frequency band of the terminal is allocated
as a resource for transmitting indication information. FIG. 3A
illustrates the case in which indication information 301, 302, 303,
304, 305, 306, and 307 is transmitted in units of each mini slot in
a specific band. Each of the indication information 301 to 307 may
indicate whether to transmit the second service data in the
corresponding mini slot. For example, when the URLLC service data
transmission, which is the second service data, is transmitted in a
third mini slot, only the indication information 303 of the third
mini slot indicates that there is the URLLC service data
transmission, and the indication information 301, 302, 304, 305,
306, and 307 of the remaining mini slots may indicate that there is
no URLLC service data transmission.
[0077] In addition, as described above, the indication information
may be transmitted only when there is the second service data. For
example, when the URLLC service data transmission, which is the
second service data, is transmitted in a third mini slot, only the
indication information 303 of the third mini slot indicates that
there is the URLLC service data transmission, and the indication
information 301, 302, 304, 305, 306, and 307 of the remaining mini
slots may also transmit the eMBB service data without transmitting
the URLLC service data transmission indication information.
[0078] FIG. 3B illustrates a modified embodiment of FIG. 3A as
another embodiment of the present disclosure. Describing the
example of FIG. 3B by comparing with the FIG. 3A, it may be
confirmed that the indication information is not transmitted in the
first mini slot. A control channel may be transmitted in the first
mini slot within one slot (long TTI 100) as described in FIG. 2.
Therefore, it is assumed that the control channel is not
transmitted in the first mini slot of each slot. If the control
channel is not transmitted, the receiving terminal cannot
demodulate and decode the entire data of the corresponding slot.
Therefore, there may be the case in which the second service data
is configured not to be transmitted in the first mini slot of each
slot (long TTI 100). That is, FIG. 3B illustrates the example in
which the indication information 302, 303, 304, 305, 306, and 307
is transmitted in the same manner as in FIG. 3A from the second
mini slot to the seventh mini slot except for the first mini slot
of the slot to be.
[0079] Even in the case of FIG. 3B, each of the indication
information 302 to 307 may indicate whether to transmit the second
service data in the corresponding mini slot. For example, when the
URLLC service data transmission is transmitted in the second mini
slot, only the indication information 302 of the second mini slot
indicates that there is the URLLC service data transmission, and
the indication information 303, 304, 305, 306, and 307 of the
remaining mini slots may indicate that there is no URLLC service
data transmission.
[0080] In addition, as described above, the indication information
may be transmitted only when there is the second service data. For
example, when the URLLC service data transmission, which is the
second service data, is transmitted in the second mini slot, only
the indication information 302 of the second mini slot indicates
that there is the URLLC service data transmission, and the
indication information 304, 305, 306, and 307 of the remaining mini
slots may also transmit the eMBB service data without transmitting
the URLLC service data transmission indication information.
[0081] Next, referring to FIG. 3C which is another embodiment, mini
slots may be grouped in a predetermined number of units as
described with reference to FIG. 2. When one slot consists of seven
mini slots, as described above, the first slot may be a mini slot
through which the control channel is transmitted. Therefore, the
mini slots in which the second service data may be actually
transmitted may be the second mini slot to the seventh mini slot.
Therefore, FIG. 3C illustrates a case in which six mini slots from
the second mini slot to the seventh mini slot are divided into two
groups 310 and 320.
[0082] In addition, in the embodiment of FIG. 3C, the case in which
one of indication information 311 and 321 is transmitted for each
group is illustrated. That is, there is a case in which only one of
the indication information 311 and 321 indicates whether to
transmit the second service data in at least one of the mini slots
in the corresponding group of the mini slots. For example, when the
URLLC data, which is the second service data, is transmitted only
in the fifth mini slot, the indication information 311 of the first
group 310 is configured to indicate that the second service data is
not transmitted. Next, the indication information 321 of the second
group 320 including the fifth mini slot is configured to indicate
that the second service data is included in the corresponding group
and transmitted.
[0083] In addition, as described above, the indication information
may be transmitted only when there is the second service data. For
example, when the URLLC service data transmission, which is the
second service data, is transmitted in the fifth mini slot, the
indication information 311 of the first group 310 may be configured
to transmit the eMBB data without being transmitted because the
second service data is not transmitted. Next, the indication
information 321 of the second group 320 including the fifth mini
slot may be transmitted allocated to the corresponding resource
because the second service data is included in the corresponding
group and transmitted. At this time, the indication information 321
may be configured to indicate that the second service data is
transmitted.
[0084] Referring to FIG. 3D which is another embodiment of the
present disclosure, the indication information 331 may be
configured in units of one slot (long TTI 100) instead of the units
of the mini slots. For example, when the second service data is
transmitted in at least one of the first mini slot to the seventh
mini slot, the indication information 331 configured in the last
mini slot of the corresponding slot (long TTI 100) may be
transmitted by being configured to notify that the second service
data is transmitted. On the other hand, when there is no
transmission of the second service data in all of the first mini
slot to the seventh mini slot, the indication information 331
configured in the last mini slot of the corresponding slot (long
TTI 100) may be configured to notify that the second service data
is not transmitted.
[0085] In addition, when there is no transmission of the second
service data in all of the first mini slot to the seventh mini
slot, the indication information 331 configured in the last mini
slot of the corresponding slot (long TTI 100) may be configured to
transmit the eMBB data without being transmitted.
[0086] As illustrated in FIGS. 3A to 3D described above, there may
be a case in which it is notified whether to transmit the second
service data every mini slot, several mini slots are grouped within
one slot to notify whether to transmit the second service data
within the grouping, or it is notified whether the second service
data is transmitted in a slot unit, not a mini slot unit. That is,
in the embodiment of FIGS. 3A to 3D, the indication information may
be configured to be transmitted in the minimum number of times by
using only resources in a frequency band in a minimum unit for
transmitting the indication information in one set unit, for
example, units of a mini slot, a group of mini slots, or a slot.
The configurations as illustrated in FIGS. 3A to 3D have an
advantage that an unnecessary waste of a bandwidth in the wireless
communication system may be reduced.
[0087] However, the receiver may not accurately detect when the
indication information is transmitted once using only the resource
of the frequency band in the minimum unit as illustrated in FIGS.
3A to 3D. For example, the radio channel conditions of the
corresponding resource may suddenly become poor or may be subject
to deep fading, severe interference, and the like. As described
above, when the indication information is transmitted only once in
the units of the mini slot, the group of the mini slots, or the
slot in each base station or the cell, a reception error may occur.
The case in which the reception error occurs may be understood in
the same manner as in the case in which there is no corresponding
indication information as described in the related art.
[0088] Therefore, other embodiments of the present disclosure for
addressing the problem will be described with reference to FIGS. 4A
to 4D.
[0089] FIGS. 4A to 4D are diagrams for transmitting indication
information in a specific cell or a base station according to
another embodiment of the present disclosure.
[0090] Referring to FIGS. 4A to 4D, a horizontal axis represents a
time resource and a vertical axis represents a frequency resource.
The frequency resource on the vertical axis may be the entire
frequency band that may be used or allocated in the 5G wireless
communication system or may be a transmission/reception bandwidth
of a specific terminal Generally, the entire band of the 5G
wireless communication system is a very wide band. Therefore, it is
unreasonable for the terminal to search for the entire band of the
5G wireless communication system in consideration of the power
consumption of the terminal and the like, and therefore the
following description will be made under the assumption that the
vertical axis represents a transmitting/receiving band that the
terminal searches for or can search for. In addition, even in FIGS.
4A to 4D, the same reference numerals among the reference numerals
used in the drawings described above are used for the same
parts.
[0091] First of all, prior to describing FIG. 4A, FIGS. 4A to 4D
illustrate a case in which one slot (long TTI 100) consists of
seven mini slots as described above. It is assumed that mini slot
120 may include at least one OFDM symbol, and one mini slot 120 may
include two OFDM symbols as described above. In addition, FIG. 4A
also illustrates an eMBB #1 resource 201 allocated to the first
terminal and an eMBB #2 resource 202 allocated to the second
terminal. Here, each eMBB service data may be first service data.
The base station may transmit data using a frequency resource band
in which the eMBB #1 resource 201 allocated to the first terminal
and the eMBB #2 resource 202 allocated to the second terminal are
each allocated in the entire time interval within the slot (long
TTI 100).
[0092] FIG. 4A illustrates an example of a method for allocating a
resource transmitting indication information in a plurality of
fixed frequency bands in the entire frequency band or a
transmission/reception frequency band of a terminal. As illustrated
in FIG. 4A, one slot (long TTI 100) may include the first mini slot
to the seventh mini slot. The case in which in the first mini slot
among those mini slots, indication information 301, 401, 411 and
421 is transmitted in different four fixed frequency bands is
illustrated. Also, the case in which even in the second mini slot,
the indication information 302, 402, 412, and 422 are transmitted
in the same four frequency bands as the first mini slot is
illustrated, and the case in which even in the third mini slot to
the seventh mini slot, indication information 403, 413, 423, 304,
404, 414, 424, 305, 405, 415, 425, 306, 406, 416, 426, 307, 407,
417, and 427 is transmitted in the same four frequency bands is
illustrated.
[0093] In the case of using the above method, it is possible to
indicate whether to transmit the second service data in units of
each mini slot. For example, when the URLLC service data
transmission, which is the second service data, is transmitted in
the third mini slot, only the indication information 303, 403, 413,
and 423 of the third mini slot indicates that there is the URLLC
service data transmission, and the indication information of the
remaining mini slots may indicate that there is no URLLC service
data transmission.
[0094] In addition, for example, when the URLLC service data
transmission, which is the second service data, is transmitted in
the third mini slot, only the indication information 303, 403, 413,
and 423 of the third mini slot indicates that there is the URLLC
service data transmission, and the indication information of the
remaining mini slots may be configured to transmit the eMBB data
without transmitting the URLLC service data.
[0095] FIG. 4B illustrates a modified embodiment of FIG. 4A as
another embodiment of the present disclosure. Describing the
example of FIG. 4B by comparing with the FIG. 4A, it may be
confirmed that the indication information is not transmitted in the
first mini slot. A control channel may be transmitted in the first
mini slot within one slot (long TTI 100) as described in FIG. 2.
Therefore, it is assumed that the control channel is not
transmitted in the first mini slot of each slot. If the control
channel is not transmitted, the receiving terminal cannot
demodulate and decode the entire data of the corresponding slot.
Therefore, there may be the case in which the second service data
is configured not to be transmitted in the first mini slot of each
slot (long TTI 100). That is, FIG. 4B illustrates the example of
the case in which the indication information 302, 402, 412, 422,
303, 403, 413, 423, 304, 404, 414, 424, 305, 405, 415, 425, 306,
406, 416, 426, 307, 407, 417, and 427 is transmitted in the same
form as FIG. 4A in the second mini slot to the seventh mini slot
except for the first mini slot of the slots.
[0096] Even in the case of FIG. 3B, the indication information
transmitted in one mini slot may indicate whether to transmit the
second service data in the corresponding mini slot. For example,
when the URLLC service data transmission is transmitted in the
second mini slot, only the indication information 302, 402, 412,
and 422 of the second mini slot indicates that there is the URLLC
service data transmission, and the indication information of the
remaining mini slots may indicate that there is no URLLC service
data transmission.
[0097] In addition, for example, when the URLLC service data
transmission is transmitted in the second mini slot, only the
indication information 302, 402, 412, and 422 of the third mini
slot indicates that there is the URLLC service data transmission,
and the indication information of the remaining mini slots may be
configured to transmit the eMBB data without transmitting the URLLC
service data transmission indication information.
[0098] Next, referring to FIG. 4C which is another embodiment,
mini-slots may be grouped in a predetermined number of units as
described with reference to FIG. 2. When one slot consists of seven
mini slots, as described above, the first slot may be a mini slot
through which the control channel is transmitted. Therefore, the
mini slots in which the second service data may be actually
transmitted may be the second mini slot to the seventh mini slot.
Therefore, FIG. 3C illustrates a case in which six mini slots from
the second mini slot to the seventh mini slot are divided into two
groups 410 and 420.
[0099] In addition, in the embodiment of FIG. 4C, the case in which
the indication information 411, 412, 413, 414, 421, 422, 423, and
424 are transmitted in the preset frequency resource bands for each
group is illustrated. That is, the indication information included
in the group of each mini slot may be configured to notify whether
to transmit the second service data in at least one of the mini
slots in the corresponding slot. For example, when the URLLC data,
which is the second service data, is transmitted only in the fifth
mini slot among the mini slots illustrated in FIG. 4C, the
indication information 411, 412, 413, and 414 included in the first
group 410 may be configured to indicate that the second service
data is not transmitted. Next, the indication information 421, 422,
423, and 424 of the second group 420 including the fifth mini slot
is configured to indicate that the second service data is included
in the corresponding group and transmitted.
[0100] In addition, when the URLLC data, which is the second
service data, is transmitted only in the fifth mini slot among the
mini slots illustrated in FIG. 4C, the indication information 411,
412, 413, and 414 included in the first group 410 may be configured
to transmit the first service data without transmitting the second
service data transmission indication information. Next, the
indication information 421, 422, 423, and 424 of the second group
420 including the fifth mini slot is configured to indicate that
the second service data is included in the corresponding group and
transmitted.
[0101] Referring to FIG. 4D which is another embodiment of the
present disclosure, the indication information 431, 432, 433, and
434 may be configured in units of one slot (long TTI 100) instead
of the units of the mini slots. For example, when the second
service data is transmitted in at least one of the first mini slot
to the seventh mini slot, the indication information 431, 432, 433,
and 434 configured in the last mini slot of the corresponding slot
(long TTI 100) may be configured to notify that the second service
data is transmitted. On the other hand, when there is no
transmission of the second service data in all of the first mini
slot to the seventh mini slot, the indication information 431, 432,
433, and 434 configured in the last mini slot of the corresponding
slot (long TTI 100) may be configured to notify that the second
service data is not transmitted.
[0102] In addition, when there is no transmission of the second
service data in all of the first mini slot to the seventh mini
slot, the indication information 431, 432, 433, and 434 configured
in the last mini slot of the corresponding slot (long TTI 100) may
be configured to transmit the first service data without
transmitting the second service data transmission indication
information.
[0103] In the FIGS. 4A to 4D described above, a method of improving
reliability of indication information has been described. That is,
in order to overcome the situation in which the specific frequency
band in which the indication information is transmitted is in
de-fading, a method for transmission using a plurality of location
resources has been described.
[0104] Meanwhile, comparing FIGS. 3A to 3D with FIGS. 4A to 4D, in
the case of FIGS. 3A to 3D, the indication information may be
transmitted once in the units of the mini slot, the group unit of
the mini slots, or every slot unit. On the other hand, in the case
of FIGS. 4A to 4D, the indication information may be transmitted
plural times in the units of the mini slot, the group unit of the
mini slots, or every slot unit. Therefore, in the case of FIGS. 4A
to 4D, the acquisition probability of the indication information
can be increased in terms of the receiving terminal as compared
with the case of FIGS. 3A to 3D, thereby providing a more stable
service. On the other hand, the case of FIGS. 4A to 4D may waste
more bandwidth than the case of FIGS. 3A to 3D. Therefore, it is
preferable to set the number of times of the indication information
to be transmitted in the units of each mini slot, the group unit of
the mini slots, or the slot unit to be the appropriate number of
times in terms of the bandwidth and the stability. This may be set
by an experiment in the real environment, or may use a simulation
result obtained by assuming the real environment.
[0105] The present disclosure described above first proposes the
structure considering the complexity of the decoding of the first
service data, that is, the eMBB service data in the receiving
terminal when the indication information is transmitted. That is,
it is possible to reduce the complexity due to the decoding of the
first service data in the receiving terminal by setting the
specific location in advance and transmitting the indication
information only at the corresponding location. In addition, the
receiving terminal monitors only the preset location, thereby
recognizing whether to transmit the second service data, that is,
the URLLC service data. In addition, it is possible to greatly
reduce (several bits) the amount of indication information and
greatly reduce the complexity upon the decoding of the indication
information in the receiving terminal, by notifying whether there
is the second service data based on the indication information in
the group unit of the mini slots. In addition, in the base station
or the cell corresponding to a transmitter, since the resource area
used as the indication information is set in advance, the rate
matching of the information to be transmitted may be performed in
consideration of the set resource area.
[0106] In addition, after the rate matching of the information to
be transmitted is performed without the resource area used as the
indication information in the base station or the cell
corresponding to the transmitter, if the second service
transmission indication information is not transmitted, the first
service data may be transmitted, and if the second service
transmission indication information is transmitted, the first
service data is punctured or removed from the corresponding
resource area and then the indication information for notifying the
transmission of the second service data may be transmitted.
[0107] Meanwhile, according to the embodiment described above, the
decoding latency for the eMBB service data, which is the first
service data, can be minimized. Generally, a plurality of code
blocks may exist in the resource area allocated for the eMBB, and
the receiving terminal may perform channel decoding in a code block
unit while receiving the eMBB signal. By the way, if the URLLC
service data, which is the second service data, is transmitted by
puncturing or removing the first service data from the resource
area allocated to the first service, the indication information
indicating that the first service data is punctured is recognized
before the channel decoding to perform the channel decoding in the
state in which the first service data is punctured. If the
indication information exists only in the last part of the eMBB
allocation resources, the channel decoding may not be performed on
the previously received data and the reception of the corresponding
indication information should be waited. That is, the receiving
terminal should additionally include a buffer for storing the
received data, and the decoding process may also be delayed.
Therefore, this may be prevented by transmitting the indication
information for each mini slot or each group of the mini slots
among the methods according to the present disclosure described
above. In addition, if the structure according to the present
disclosure is applied, the receiving terminal may receive at least
one indication information included in the group of the mini slots
and perform the channel decoding using the code block in the group
of the mini slots, thereby preventing the complexity of the
receiving terminal and the latency of the data processing.
[0108] In addition, in the present disclosure described above, it
is possible to minimize the overhead of the indication information.
It is possible to minimize the overhead of the indication signal by
indicating only whether to transmit the second service data, that
is, the URLLC service data in the group unit of the mini slots
(i.e., whether to puncture or remove the first service data). As
described above, in order to notify only whether transmit the
second service within the group of the mini slots, the indication
information may consist of only one bit. The detailed configuration
of the indication information will be described in more detail
below.
[0109] On the other hand, the frequency band set for transmitting
the indication information in the methods of FIGS. 3A to 3D and
FIGS. 4A to 4D described above have been described only based on
the viewpoint of one base station. However, in the actual wireless
environment, a plurality of base stations are neighboring to each
other to form a network. Therefore, the actual wireless network may
be influenced by signals received from neighboring base stations at
an edge of the base station or a cell edge. Accordingly, a method
for transmitting the indication information more securely is
needed. Hereinafter, a method for transmitting indication
information considering neighboring base stations will be
described.
[0110] FIG. 5A is a diagram for explaining a case in which a
frequency band for transmitting indication information is set as
the same frequency band for each base station or each cell
according to an embodiment of the present disclosure, and FIG. 5B
is an diagram for explaining a case in which a frequency band for
transmitting indication information is set as different frequency
bands for each base station or each cell according to an embodiment
of the present disclosure.
[0111] Referring to FIG. 5A, an example of a case in which
indication information is transmitted in each slot within a first
cell 510, a second cell 520, and a third cell 530 is illustrated.
In addition, in the example of FIG. 5A, the case in which the
indication information is transmitted by the transmission method of
FIG. 4C is illustrated. However, as the transmission method of FIG.
5A, any of the method for transmitting indication information of
FIGS. 3A to 3D and the transmission method of FIGS. 4A to 4D may be
used. In addition, the first cell 510, the second cell 520, and the
third cell 530 illustrated in FIG. 5A may be neighboring cells to
each other.
[0112] In the first cell 510, three indication information 511,
512, and 513 is transmitted using preset three frequency resources
in a fourth mini slot, and three indication information 514, 515,
and 516 is transmitted using the same three frequency resources in
a seventh mini slot. In addition, in the second cell 520, three
indication information 521, 522, and 523 is transmitted using
preset three frequency resources in a fourth mini slot, and three
indication information 524, 525, and 526 is transmitted using the
same three frequency resources in a seventh mini slot. In the
finally illustrated cell 530, three indication information 531,
532, and 533 is transmitted using preset three frequency resources
in a fourth mini slot, and three indication information 534, 535,
and 536 is transmitted using the same three frequency resources in
a seventh mini slot. In this case, it can be understood based on
the example of FIG. 5A that the preset three frequency resources in
the first cell 510, the second cell 520, and the third cell 530 are
resources of the same frequency band.
[0113] That is, in FIG. 5A illustrates a method for sharing, by all
the cells 510, 520, and 530, the same frequency resource to which
the indication information is transmitted. As described above, when
the indication information is transmitted using the same frequency
resources in all the cells 510, 520 and 530, it is preferable to
use a sequence having an excellent correlation characteristic
between neighboring cells. This will be described in more detail in
the description of the drawings to be described below.
[0114] Referring to FIG. 5B, the example of the case in which
indication information is transmitted in each slot within the first
cell 510, the second cell 520, and the third cell 530 is
illustrated. In addition, in the example of FIG. 5B, the case in
which the indication information is transmitted by the transmission
method of FIG. 4C is illustrated. In addition, like the description
of FIG. 5A, as the transmission method of FIG. 5B, any of the
method for transmitting indication information of FIGS. 3A to 3D
and the transmission method of FIGS. 4A to 4D may be used. In
addition, the first cell 510, the second cell 520, and the third
cell 530 illustrated in FIG. 5B may be neighboring cells to each
other.
[0115] In the first cell 510, three indication information 511,
512, and 513 is transmitted using preset three frequency resources
in a fourth mini slot, and three indication information 514, 515,
and 516 is transmitted using the same three frequency resources as
the fourth mini slot in a seventh mini slot.
[0116] In the second cell 520, three indication information 521,
522, and 523 is transmitted using preset three frequency resources
in a fourth mini slot, and three indication information 524, 525,
and 526 is transmitted using the same three frequency resources as
the frequency resource transmitting the indication information in
the fourth mini slot even in a seventh mini slot.
[0117] In the finally illustrated third cell 530, three indication
information 531, 532, and 533 is transmitted using preset three
frequency resources in a fourth mini slot, and three indication
information 534, 535, and 536 is transmitted using the same three
frequency resources as the frequency resource transmitting the
indication information in the fourth mini slot even in a seventh
mini slot. In this case, it can be understood based on the example
of FIG. 5B that the preset three frequency resources in the first
cell 510, the second cell 520, and the third cell 530 are resources
of different frequency bands. That is, the indication information
521 and 524 transmitted through the first frequency resource in the
second cell 520 is a different resource from the first frequency
resource of the first cell 510 and is also a resource different
from the first frequency resource of the third cell 530. In
addition, the first frequency resource of the first cell 510 is a
resource different from a first frequency resource of the third
cell 530.
[0118] That is, the following two rules may apply to allocation of
frequency resources for transmitting the indication information
between neighboring cells according to the present disclosure
illustrated in FIG. 5B. First, in each cell 510, 520, and 530, the
indication information is transmitted using the frequency resource
of the same location. Second, the indication information is
transmitted using different frequency resources between the
respective neighboring cells, that is, the frequency resource that
does not overlap with any of neighboring cells. By applying these
two rules, it is possible to minimize the interference influence
between cells and the influence at the cell edge. In addition, the
specific frequency resource is fixedly allocated in the same cell,
thereby reducing the complexity of the receiving terminal On the
other hand, when different frequency resources are used between
neighboring cells as illustrated in FIG. 5B, they may configured to
be transmitted by boosting the power of the indication information
to be higher than that of a data symbol. This makes it possible to
secure higher reliability in reception of the indication
information in the receiving terminal.
[0119] On the other hand, a method for setting a frequency band to
transmit the indication information using different frequency
resources for each base station and each cell may be defined in
various forms. First, in the standard protocol, the location of the
frequency resource may be determined using the information of the
base station or the cell, for example, identification information.
Second, it is also possible to control the frequency resources for
each base station or cell to be different from each other at a node
of a higher layer controlling the base stations or the cells. The
second method may be defined in the standard protocol, or may be
left to the discretion of each operator. Third, the base stations
may set a frequency resource for transmitting their own indication
information in a mutual random form. When the first to third
methods are used, the base stations may notify all the terminals
included in the base station or the active terminals performing
communication using the higher layer signal or the broadcast signal
of the frequency resource location of the indication information in
advance.
[0120] In the above description, the contents for allocating the
indication information in terms of each base station or cell has
been described. However, it may be configured to transmit
indication information based on the resources allocated to the
receiving terminal That is, it may be configured to transmit the
indication information within the corresponding resource based on
the resource allocated to the receiving terminal receiving the eMBB
data which is the first service data. Hereinafter, the methods of
transmitting indication information from a resource allocated to a
receiving terminal will be described.
[0121] FIGS. 6A to 6D are diagrams for transmitting indication
information based on a resource allocated to a receiving terminal
according to another embodiment of the present disclosure.
[0122] Referring to FIGS. 6A to 6D, a horizontal axis represents a
time resource and a vertical axis represents a frequency resource.
As described above, it is unreasonable for the terminal to search
for the entire band of the 5G wireless communication system in
consideration of the power consumption of the terminal and the
like, and therefore the following description will be made under
the assumption that the vertical axis represents a
transmitting/receiving band that the terminal searches for or can
search for. Also, the same reference numerals are used for the same
parts of the reference numerals used in the drawings described
above.
[0123] First of all, prior to describing FIG. 6A, FIGS. 6A to 6D
illustrate a case in which one slot (long TTI 100) consists of
seven mini slots as described above. It is assumed that mini slot
120 may include at least one OFDM symbol, and one mini slot 120 may
include two OFDM symbols as described above.
[0124] FIG. 6A also illustrates an eMBB #1 resource 610 allocated
to the first terminal and an eMBB #2 resource 620 allocated to the
second terminal. Here, each eMBB service data may be first service
data. The base station may transmit data using a frequency resource
band in which the eMBB #1 resource 610 allocated to the first
terminal and the eMBB #2 resource 620 allocated to the second
terminal are each allocated in the entire time interval within the
slot (long TTI 100).
[0125] Referring to FIG. 6A, the base station transmits indication
information 611, 612, 613, 614, 615, 616, and 617 for notifying
whether to transmit the second service data in all mini slots using
the preset frequency resource in the eMBB #1 resource 610 allocated
to the first terminal.
[0126] At this time, the indication information 611 to 617
transmitted from the eMBB #1 resource 610 allocated to the first
terminal is information transmitted only to the first terminal, and
may be information valid only for the first terminal. In addition,
the base station transmits indication information 621, 622, 623,
624, 625, 626, and 627 for notifying whether to transmit the second
service data in all mini slots using the preset frequency resource
in the eMBB #2 resource 610 allocated to the second terminal. At
this time, the indication information 621 to 627 in the eMBB #2
resource 620 allocated to the second terminal is information
transmitted only to the second terminal, and may be information
valid only for the second terminal.
[0127] For example, when the second service data is transmitted to
the third mini slot of the eMBB #1 resource 610 allocated to the
first terminal, the indication information 613 located in the third
mini slot of the eMBB #1 resource 610 allocated to the first
terminal may indicate that the second service data is transmitted,
and the indication information 611, 612, and 614 to 617 located in
the remaining mini slots may indicate that the second service data
is not transmitted. In this case, since the second terminal does
not refer to the area allocated to the first terminal, the
transmission of the second service data in the third mini slot of
the eMBB #2 resource 620 allocated to the second terminal follows
the indication of the indication information 623 located in the
third mini slot.
[0128] In addition, the indication information 611 to 617
transmitted from the eMBB #1 resource 610 allocated to the first
terminal is the information transmitted only to the first terminal,
and the indication information 621 to 627 transmitted from the eMBB
#2 resource 620 allocated to the second terminal is information
transmitted only to the second terminal. The channel conditions
between the base station and the first terminal may be different
from the channel conditions between the base station and the second
terminal may be different, such that the received signal-to-noise
ratios of the first terminal and the second terminal may be
different from each other. Accordingly, the indication information
611 to 617 transmitted from the eMBB #1 resource 610 allocated to
the first terminal and the indication information 621 to 627
transmitted from the eMBB #2 resource 620 allocated to the second
terminal may be applied with different modulation methods and
different channel encoding techniques or channel encoding rates. In
addition, the indication information 611 to 617 transmitted from
the eMBB #1 resource 610 allocated to the first terminal and the
indication information 621 to 627 transmitted from the eMBB #2
resource 620 allocated to the second terminal may be mapped by a
sequence having different length and may be transmitted by making a
resource amount used for the indication information transmission
different.
[0129] For example, if the first terminal applies a quadrature
phase-shift keying (QPSK) modulation scheme to transmit the eMBB
data and applies a channel encoding rate of 1/3, it is assumed that
the signal-to-noise ratio at which the first terminal operates is
approximately -1 dB. In this case, the base station may set the
channel encoding rate to be applied to the indication information
to be 1/4 to allow the first terminal to stably detect the
indication information. Meanwhile, if the second terminal applies a
QPSK modulation scheme to transmit the eMBB data and applies a
channel encoding rate of 1/2, it is assumed that the
signal-to-noise ratio at which the second terminal operates is
approximately 2 dB. In this way, when the channel conditions of the
second terminal are better than those of the first terminal, the
base station can increase the channel encoding rate applied to the
indication information to be transmitted to the second terminal to
1/2. In addition, if the third terminal applies a 16 quadrature
amplitude modulation (QAM) modulation scheme to transmit the eMBB
data and applies a channel encoding rate of 1/2, it is assumed that
the signal-to-noise ratio at which the third terminal operates is
approximately 9 dB. In this case, since the channel conditions of
the third terminal are better than those of the first terminal and
the second terminal, the base station may not apply channel
encoding to the indication information to be transmitted to the
third terminal.
[0130] As in the above embodiment, the channel encoding rate of the
indication information transmitted from the base station to each
mobile station may be set differently according to the modulation
scheme and the channel encoding rate that each terminal applies for
the eMBB data transmission. This may effectively increase the
resource utilization efficiency by effectively allocating the
resource amount used for the indication information transmission in
consideration of the channel conditions of each terminal.
[0131] The above embodiment describes the method for differently
setting a channel encoding rate applied to indication information
transmitted from a base station to each terminal according to a
modulation scheme and a channel encoding rate that each terminal
applies for the eMBB data transmission. However, the channel
encoding rate applied to the indication information is only one
example. As another method, at least one of the modulation method
applied to the indication information, the length of the sequence
for mapping the indication information, and the resource amount
allocated for the transmission of the indication information, or a
combination thereof may be used.
[0132] In addition, in the above embodiment, the modulation scheme
and the channel encoding rate applied for the eMBB data
transmission are described as (QPSK, 1/3 coding rate), (QPSK, 1/2
coding rate), (16 QAM, 1/2 coding rate), which is only an example.
Therefore, it is obvious that other modulation schemes and channel
encoding rates can be simply extended ad applied.
[0133] In addition, the above embodiment describes that when the
base station applies (QPSK, 1/3 coding rate) to the terminal for
the eMBB data transmission, a 1/4 channel encoding rate is applied
for the indication information transmission, and when the base
station applies (QPSK, 1/2 coding rate), a 1/2 channel encoding
rate is applied for the indication information transmission, and
when the base station applies (16 QAM, 1/2 coding rate), the
channel encoding rate is not applied for the indication information
transmission. Here, it is obvious that the channel encoding rates
1/4, 1/2, and 1 (channel encoding is not applied) for the
indication information transmission are only an example, and
therefore other channel encoding rates may be used.
[0134] In addition, the channel encoding rate to be applied to the
indication information, the modulation method, the length of the
sequence for mapping the indication information, and the resource
amount allocated for the transmission of the indication information
may be determined in advance depending on the modulation method and
channel encoding rate applied when the base station transmits the
eMBB data to each terminal. In addition, the modulation method and
the channel encoding rate applied when the base station transmits
eMBB data to each terminal may be defined by being mapped to the
channel encoding rate to be applied to the indication information,
the modulation method the length of the sequence for mapping the
indication information, and the resource amount allocated for the
transmission of the indication information one to one. As another
method, the modulation method and the channel encoding rate applied
when the base station transmits eMBB data to each terminal may be
grouped, and may be defined by being mapping to the channel
encoding rate that the base station applies to the indication
information, the modulation method, the length of the sequence for
mapping the indication information, and the resource amount
allocated for the transmission of the indication information one to
one, with respect to each group. As another method, a plurality of
mapping rules may be defined, and the base station may indicate a
mapping rule version to the terminal according to at least one of
fading channel conditions, interference conditions, and intra-cell
traffic conditions.
[0135] As described above, when the indication information is
transmitted through a specific frequency band in the resources
allocated to each terminal, it is possible to indicate whether to
transmit the second service data for each resource allocated to
each terminal. When it is indicated whether to transmit the second
service for each resource allocated to the terminal, it is
sufficient to process data only in the band allocated to the
receiving terminal in terms of the receiving terminal, such that
the complexity of the terminal can be reduced.
[0136] Next, FIG. 6B illustrates a modified embodiment of FIG. 6A
as another embodiment of the present disclosure. Describing the
example of FIG. 6B by comparing with the FIG. 6A, it may be
confirmed that the indication information is not transmitted in the
first mini slot. The control channel may be transmitted in the
first mini slot within one slot (long TTI 100) as described in FIG.
2. Therefore, it is assumed that the control channel is not
transmitted in the first mini slot of each slot. If the control
channel is not transmitted, the receiving terminal cannot
demodulate and decode the entire data of the corresponding slot.
Therefore, there may be the case in which the second service data
is configured not to be transmitted in the first mini slot of each
slot (long TTI 100). That is, the example of FIG. 6B corresponds to
the case in which the indication information is transmitted in the
same form as FIG. 6A from the second mini slot to the seventh mini
slot other than the first mini slot in the resources allocated to
each terminal.
[0137] That is, in FIG. 6B, indication information 612, 613, 614,
615, 616, and 617 for notifying whether to transmit the second
service data in all the remaining mini slots other than the first
mini slot using a preset frequency resource in the eMBB #1 resource
610 allocated to transmit the first service data to the first
terminal is transmitted. In addition, indication information 622,
623, 624, 625, 626, and 627 for notifying whether to transmit the
second service data in all the remaining mini slots other than the
first mini slot using a preset frequency resource in the eMBB #2
resource 620 allocated to transmit the first service data to the
second terminal is transmitted.
[0138] Even in FIG. 6B, the indication information 612 to 617
transmitted from the eMBB #1 resource 610 allocated to the first
terminal is information transmitted only to the first terminal, and
may be information valid only for the first terminal. The
indication information 622 to 627 in the eMBB #2 resource 620
allocated to the second terminal is information transmitted only to
the second terminal, and may be information valid only for the
second terminal.
[0139] In addition, the indication information 612 to 617
transmitted from the eMBB #1 resource 610 allocated to the first
terminal is the information transmitted only to the first terminal,
and the indication information 622 to 627 transmitted from the eMBB
#2 resource 620 allocated to the second terminal may be the
information transmitted only to the second terminal The channel
conditions between the base station and the first terminal may be
different from the channel conditions between the base station and
the second terminal may be different from each other, such that the
received signal-to-noise ratios of the first terminal and the
second terminal may be different from each other. Accordingly, the
indication information 612 to 617 transmitted from the eMBB #1
resource 610 allocated to the first terminal and the indication
information 622 to 627 transmitted from the eMBB #2 resource 620
allocated to the second terminal may be applied with different
modulation methods and different channel encoding techniques or
channel encoding rates, mapped by the sequence having different
lengths, and transmitted by differently allocating the resource
amount used for the indication information transmission. This has
already been described with reference to FIG. 6A described above,
and therefore the additional description will be omitted.
[0140] Next, referring to FIG. 6C which is another embodiment,
mini-slots may be grouped in a predetermined number of units as
described with reference to FIG. 2. When one slot consists of seven
mini slots, as described above, the first slot may be a mini slot
through which the control channel is transmitted. Therefore, the
mini slots in which the second service data may be actually
transmitted may be the second mini slot to the seventh mini slot.
Therefore, FIG. 6C illustrates a case in which six mini slots from
the second mini slot to the seventh mini slot are divided into two
groups 630 and 640.
[0141] In addition, in the embodiment of FIG. 6C, one indication
information 631 and 641 may be transmitted to each of the first
group 630 and the second group 640 of the eMBB #1 resources 610
allocated to the first terminal, and one indication information 632
and 642 may be transmitted to each of a first group 630 and a
second group 640 of the eMBB #2 resource 620 allocated to the
second terminal.
[0142] Each indication information may indicate whether to transmit
the second service data in at least one of the mini slots included
in the corresponding group of the resource allocated to the
corresponding terminal. For example, when the URLLC data, which is
the second service data, is transmitted only in the fifth mini slot
of the eMBB #2 resource 620 allocated to the second terminal, only
the indication information 642 of the above-mentioned indication
information indicates that the second service data is transmitted
and all the remaining indication information indicates that the
second service data is not transmitted. Therefore, even in the
embodiment of FIG. 6C, the indication information 631 and 641
transmitted from the eMBB #1 resource 610 allocated to the first
terminal is the information transmitted only to the first terminal
and may be information valid only for the first terminal, and the
indication information 632 and 642 transmitted from the eMBB #2
resource 620 allocated to the second terminal is information
transmitted only to the second terminal and may be information
valid only for the second terminal.
[0143] In addition, the indication information 631 and 641
transmitted from the eMBB #1 resource 610 allocated to the first
terminal is the information transmitted only to the first terminal,
and the indication information 632 and 642 transmitted from the
eMBB #2 resource 620 allocated to the second terminal is
information transmitted only to the second terminal. The channel
conditions between the base station and the first terminal and the
channel conditions between the base station and the second terminal
may be different from each other, such that the received
signal-to-noise ratios of the first terminal and the second
terminal may be different from each other. Accordingly, the
indication information 631 and 641 transmitted from the eMBB #1
resource 610 allocated to the first terminal and the indication
information 632 and 642 transmitted from the eMBB #2 resource 620
allocated to the second terminal may be applied with different
modulation methods and different channel encoding techniques or
channel encoding rates, mapped by the sequence having different
lengths, and transmitted by differently allocating the resource
amount used for the indication information transmission. This has
already been described with reference to the embodiment of FIG. 6A
described above, and therefore the additional description will be
omitted.
[0144] Referring to FIG. 6D which is another embodiment of the
present disclosure, the indication information 617 and 627 may be
configured in units of one slot (long TTI 100) instead of the units
of the mini slots for each resource allocated to each terminal For
example, when the second service data is transmitted in at least
one of the first mini slot to the seventh mini slot of the eMBB #1
resource 610 allocated to the first terminal, the indication
information 617 configured in the last mini slot of the
corresponding slot (long TTI 100) may be transmitted by being
configured to notify that the second service data is transmitted.
On the other hand, when there is no transmission of the second
service data in all of the first mini slot to the seventh mini slot
in the eMBB #2 resource 620 allocated to the second terminal, the
indication information 627 configured in the last mini slot of the
corresponding slot (long TTI 100) may be configured to notify that
the second service data is not transmitted.
[0145] In addition, on the other hand, when there is no
transmission of the second service data in all of the first mini
slot to the seventh mini slot in the eMBB #2 resource 620 allocated
to the second terminal, the indication information notifying the
second service data in the indication information 627 configured in
the last mini slot of the corresponding slot (long TTI 100) may not
be transmitted and configured to transmit the first service
data.
[0146] In addition, the indication information 617 transmitted from
the eMBB #1 resource 610 allocated to the first terminal is the
information transmitted only to the first terminal, and the
indication information 627 transmitted from the eMBB #2 resource
620 allocated to the second terminal is information transmitted
only to the second terminal. The channel conditions between the
base station and the first terminal and the channel conditions
between the base station and the second terminal may be different
from each other, such that the received signal-to-noise ratios of
the first terminal and the second terminal may be different from
each other. Accordingly, the indication information 617 transmitted
from the eMBB #1 resource 610 allocated to the first terminal and
the indication information 627 transmitted from the eMBB #2
resource 620 allocated to the second terminal may be applied with
different modulation methods and different channel encoding
techniques or channel encoding rates, mapped by the sequence having
different lengths, and transmitted by differently allocating the
resource amount used for the indication information transmission.
This has already been described with reference to the embodiment of
FIG. 6A described above, and therefore the additional description
will be omitted.
[0147] As illustrated in FIGS. 6A to 6D described above, there may
be a case in which it is notified whether transmit the second
service data every mini slot for each band allocated to each
terminal, several mini slots are grouped within one slot to notify
whether to transmit the second service data within the grouping, or
it is notified whether the second service data is transmitted in a
slot unit, not a mini slot unit. That is, in the embodiment of
FIGS. 6A to 6D, the indication information may be configured to be
transmitted in the minimum number of times by using only resources
in a frequency band in a minimum unit for transmitting the
indication information in one set unit, for example, units of a
mini slot, a group of mini slots, or a slot in the resources
allocated to each terminal. The configurations as illustrated in
FIGS. 6A to 6D have an advantage that an unnecessary waste of a
bandwidth in the wireless communication system may be reduced.
[0148] However, the receiver may not accurately detect when the
indication information is transmitted once using only the resource
of the frequency band in the minimum unit as illustrated in FIGS.
6A to 6D. For example, the radio channel conditions of the
corresponding resource may suddenly become poor or may be subject
to deep fading, severe interference, and the like. As described
above, when the indication information is transmitted only once in
the units of the mini slot, the group of the mini slots, or the
slot in the resources allocated to each terminal, a reception error
may occur. The case in which the reception error occurs may be
understood in the same manner as in the case in which there is no
corresponding indication information as described in the related
art.
[0149] Therefore, other embodiments of the present disclosure for
addressing the problem will be described with reference to FIGS. 7A
to 7D.
[0150] FIGS. 7A to 7D are diagrams for transmitting indication
information based on a resource allocated to a receiving terminal
according to another embodiment of the present disclosure.
[0151] Referring to FIGS. 7A to 7D, a horizontal axis represents a
time resource and a vertical axis represents a frequency resource.
The frequency resource on the vertical axis may be the entire
frequency band that may be used or allocated in the 5G wireless
communication system or may be a transmission/reception bandwidth
of a specific terminal. In the following description, it is assumed
that the vertical axis is a transmission/reception band which the
terminal searches for or may search for.
[0152] First of all, prior to describing FIG. 7A, FIGS. 7A to 7D
illustrate a case in which one slot (long TTI 100) consists of
seven mini slots as described above. It is assumed that mini slot
120 may include at least one OFDM symbol, and one mini slot 120 may
include two OFDM symbols as described above. In addition, FIG. 7A
also illustrates the eMBB #1 resource 610 allocated to the first
terminal and the eMBB #2 resource 620 allocated to the second
terminal. Here, each eMBB service data may be first service data.
The base station may transmit data using a frequency resource band
in which the eMBB #1 resource 610 allocated to the first terminal
and the eMBB #2 resource 620 allocated to the second terminal are
each allocated in the entire time interval within the slot (long
TTI 100).
[0153] Referring to FIG. 7A, in the example of FIG. 7A, a plurality
of fixed frequency bands are allocated, as the resource for
transmitting the indication information, to each of resources 610
and 620 allocated to each terminal in the entire frequency band or
the transmission/reception frequency band of the terminal As
illustrated in FIG. 7A, one slot (long TTI 100) may include the
first mini slot to the seventh mini slot. Among those, in the first
mini slot of the eMBB #1 resource 610 allocated for the first
service data transmission to the first terminal, the case in which
the indication information 611a and 611b are transmitted in two
different fixed frequency bands is illustrated. Also, even in the
second mini slot of the eMBB #1 resource 610 allocated for the
first service data transmission to the first terminal, the case in
which indication information 612a and 612b are transmitted in the
same two frequency bands as the first mini slot is illustrated, and
even in the third mini slot to the seventh mini slot of the eMBB #1
resource 610 allocated for the first service data transmission to
the first terminal, the case in which indication information 613a,
613b, 614a, 614b, 615a, 615b, 616a, 616b, 617a, and 617b are
transmitted in the same two frequency bands is illustrated. This
illustrates that even in the case of the eMBB #2 resource 620
allocated to transmit the first service data to the second
terminal, indication information 621a, 621b, 622a, 622b, 623a,
623b, 624a, 624b, 625a, 625b, 626a, 626b, 627a, and 627b may be
transmitted in the same form.
[0154] As a result, in each of the mini slots of the eMBB #1
resource 610 allocated for the first service data transmission to
the first terminal and the eMBB #2 resource 620 allocated for the
first service data transmission to the second terminal, two
indication information may be configured to be transmitted.
[0155] As in FIGS. 7A and 7B, the indication information 611a to
617b transmitted from the eMBB #1 resource 610 allocated to the
first terminal is information transmitted only to the first
terminal, and may be information valid only for the first terminal.
In addition, the indication information 621a to 627b in the eMBB #2
resource 620 allocated to the second terminal is the information
transmitted only to the second terminal, and may be the information
valid only for the second terminal
[0156] For example, when the second service data is transmitted to
the third mini slot of the eMBB #1 resource 610 allocated to the
first terminal, the indication information 613a and 613b located in
the third mini slot of the eMBB # 1 resource 613 allocated to the
first terminal may indicate that the second service data is
transmitted, and the indication information 611a to 612b and 614a
to 617b located in the remaining mini slots may indicate that the
second service data is not transmitted. In addition, for example,
when the second service data is transmitted to the third mini slot
of the eMBB #1 resource 610 allocated to the first terminal, the
indication information 613a and 613b located in the third mini slot
of the eMBB # 1 resource 613 allocated to the first terminal may
indicate that the second service data is transmitted, and the
indication information 611a to 612b and 614a to 617b located in the
remaining mini slots may be configured to transmit the first
service data without transmitting the indication information. In
this case, since the second terminal does not refer to the area
allocated to the first terminal, the transmission of the second
service data in the third mini slot of the eMBB #2 resource 620
allocated to the second terminal follows the indication of the
indication information 623a and 623b located in the third mini
slot.
[0157] In addition, the indication information 611a to 617b
transmitted from the eMBB #1 resource 610 allocated to the first
terminal is the information transmitted only to the first terminal,
and the indication information 621a to 627b transmitted from the
eMBB #2 resource 620 allocated to the second terminal is
information transmitted only to the second terminal The channel
conditions between the base station and the first terminal and the
channel conditions between the base station and the second terminal
may be different from each other, such that the received
signal-to-noise ratios of the first terminal and the second
terminal may be different from each other. Accordingly, the
indication information 611a to 617b transmitted from the eMBB #1
resource 610 allocated to the first terminal and the indication
information 621a to 627b transmitted from the eMBB #2 resource 620
allocated to the second terminal may be applied with different
modulation methods and different channel encoding techniques or
channel encoding rates, mapped by the sequence having different
lengths, and transmitted by differently allocating the resource
amount used for the indication information transmission. This has
already been described with reference to the embodiment of FIG. 6A
described above, and therefore the additional description will be
omitted.
[0158] As described above, when the indication information is
transmitted through a specific frequency band in the resources
allocated to each terminal, it is possible to indicate whether to
transmit the second service data for each resource allocated to
each terminal. When it is indicated whether to transmit the second
service for each resource allocated to the terminal, it is
sufficient to process data only in the band allocated to the
receiving terminal in terms of the receiving terminal, such that
the complexity of the terminal can be reduced.
[0159] FIG. 7B illustrates a modified embodiment of FIG. 7A as
another embodiment of the present disclosure. Describing the
example of FIG. 7B by comparing with the FIG. 7A, it may be
confirmed that the indication information is not transmitted in the
first mini slot. The control channel may be transmitted in the
first mini slot within one slot (long TTI 100) as described in FIG.
2. Therefore, it is assumed that the control channel is not
transmitted in the first mini slot of each slot. If the control
channel is not transmitted, the receiving terminal cannot
demodulate and decode the entire data of the corresponding slot.
Therefore, there may be the case in which the second service data
is configured not to be transmitted in the first mini slot of each
slot (long TTI 100). That is, in the example of FIG. 7B, in the
second mini slot to the seventh mini slot except for the first mini
slot of the eMBB #1 resources 610 allocated to the first terminal
in the slot (long TTI 100), the indication information 611a to 617b
may be transmitted as the same form as FIG. 7A, and in the example
of FIG. 7B, in the second mini slot to the seventh mini slot except
for the first mini slot of the eMBB #2 resource 620 allocated to
the second terminal in the slot (long TTI 100), the indication
information 621a to 627b may be transmitted in the same form as
FIG. 7A.
[0160] In addition, the indication information 612a to 617b
transmitted from the eMBB #1 resource 610 allocated to the first
terminal is the information transmitted only to the first terminal,
and the indication information 622a to 627b transmitted from the
eMBB #2 resource 620 allocated to the second terminal is
information transmitted only to the second terminal The channel
conditions between the base station and the first terminal and the
channel conditions between the base station and the second terminal
may be different from each other, such that the received
signal-to-noise ratios of the first terminal and the second
terminal may be different from each other. Accordingly, the
indication information 612a to 617b transmitted from the eMBB #1
resource 610 allocated to the first terminal and the indication
information 622a to 627b transmitted from the eMBB #2 resource 620
allocated to the second terminal may be applied with different
modulation methods and different channel encoding techniques or
channel encoding rates, mapped by the sequence having different
lengths, and transmitted by differently allocating the resource
amount used for the indication information transmission. This has
already been described with reference to the embodiment of FIG. 6A
described above, and therefore a redundant description will be
omitted.
[0161] Next, referring to FIG. 7C which is another embodiment,
mini-slots may be grouped in a predetermined number of units as
described with reference to FIG. 2. When one slot consists of seven
mini slots, as described above, the first slot may be a mini slot
through which the control channel is transmitted. Therefore, the
mini slots in which the second service data may be actually
transmitted may be the second mini slot to the seventh mini slot.
Therefore, FIG. 7C illustrates a case in which six mini slots from
the second mini slot to the seventh mini slot are divided into two
groups 630 and 640.
[0162] In addition, in the embodiment of FIG. 7C, indication
information 711a and 711b and 712a and 712b using different
frequency resources may be transmitted to each of the first group
710 and the second group 720 of the eMBB # 1 resources 610
allocated to the first terminal, and indication information 721a,
721b, 722a, and 722b using different frequency resources may be
transmitted to each of the first group 710 and the second group 720
of the eMBB #2 resource 620 allocated to the second terminal
[0163] Each indication information may indicate whether to transmit
the second service data in at least one of the mini slots included
in the corresponding group of the resource allocated to the
corresponding terminal. For example, when the URLLC data, which is
the second service data, is transmitted only in the fifth mini slot
of the eMBB #2 resource 620 allocated to the second terminal, only
the indication information 722a and 722b of the above-mentioned
indication information indicates that the second service data is
transmitted and all the remaining indication information indicates
that the second service data is not transmitted. In addition, for
example, when the URLLC data, which is the second service data, is
transmitted only in the fifth mini slot of the eMBB #2 resource 620
allocated to the second terminal, only the indication information
722a and 722b of the above-mentioned indication information
indicates that the second service data is transmitted and all the
remaining indication information may be configured to transmit only
the first service data without transmitting the indication
information notifying whether to transmit the second service data.
Therefore, even in the embodiment of FIG. 7C, the indication
information 711a to 712b transmitted from the eMBB #1 resource 610
allocated to the first terminal is information transmitted only to
the first terminal, and may be information valid only for the first
terminal. In addition, the indication information 721a to 722b
transmitted from the eMBB #2 resource 620 allocated to the second
terminal is the information transmitted only to the second
terminal, and may be the information valid only for the second
terminal.
[0164] In addition, the indication information 711a, 711b, 712a,
and 712b transmitted from the eMBB #1 resource 610 allocated to the
first terminal is the information transmitted only to the first
terminal, and the indication information 721a, 721b, 722a, and 722b
transmitted from the eMBB #2 resource 620 allocated to the second
terminal is information transmitted only to the second terminal.
The channel conditions between the base station and the first
terminal and the channel conditions between the base station and
the second terminal may be different from each other, such that the
received signal-to-noise ratios of the first terminal and the
second terminal may be different from each other. Accordingly, the
indication information 711a, 711b, 712a, and 712b transmitted from
the eMBB #1 resource 610 allocated to the first terminal and the
indication information 721a, 721b, 722a, and 722b transmitted from
the eMBB #2 resource 620 allocated to the second terminal may be
applied with different modulation methods and different channel
encoding techniques or channel encoding rates, mapped by the
sequence having different lengths, and transmitted by differently
allocating the resource amount used for the indication information
transmission. This has already been described with reference to the
embodiment of FIG. 6A described above, and therefore the additional
description will be omitted.
[0165] Referring to FIG. 7D which is another embodiment of the
present disclosure, the indication information 731a, 731b, 741a,
and 741b may be configured in units of one slot (long TTI 100)
instead of the units of the mini slots for each resource allocated
to each terminal. For example, when the second service data is
transmitted in at least one of the first mini slot to the seventh
mini slot of the eMBB #1 resource 610 allocated to the first
terminal, the indication information 731a and 731b configured in
the last mini slot of the corresponding slot (long TTI 100) may be
transmitted by being configured to notify that the second service
data is transmitted. On the other hand, when there is no
transmission of the second service data in all of the first mini
slot to the seventh mini slot in the eMBB #2 resource 620 allocated
to the second terminal, the indication information 741a and 741b
configured in the last mini slot of the corresponding slot (long
TTI 100) may be configured to notify that the second service data
is not transmitted. In addition, on the other hand, when there is
no transmission of the second service data in all of the first mini
slot to the seventh mini slot in the eMBB #2 resource 620 allocated
to the second terminal, the indication information 741a and 741b
configured in the last mini slot of the corresponding slot (long
TTI 100) may be configured to transmit only the first service data
without transmitting the control information indicating the second
service data.
[0166] In addition, the indication information 731a to 731b
transmitted from the eMBB #1 resource 610 allocated to the first
terminal is the information transmitted only to the first terminal,
and the indication information 741a to 741b transmitted from the
eMBB #2 resource 620 allocated to the second terminal is
information transmitted only to the second terminal The channel
conditions between the base station and the first terminal and the
channel conditions between the base station and the second terminal
may be different from each other, such that the received
signal-to-noise ratios of the first terminal and the second
terminal may be different from each other. Accordingly, the
indication information 731a to 731b transmitted from the eMBB #1
resource 610 allocated to the first terminal and the indication
information 741a to 741b transmitted from the eMBB #2 resource 620
allocated to the second terminal may be applied with different
modulation methods and different channel encoding techniques or
channel encoding rates, mapped by the sequence having different
lengths, and transmitted by differently allocating the resource
amount used for the indication information transmission. This has
already been described with reference to the embodiment of FIG. 6A
described above, and therefore the additional description will be
omitted.
[0167] As illustrated in FIGS. 7A to 7D described above, there may
be a case in which it is notified whether transmit the second
service data every mini slot for each band allocated to each
terminal, several mini slots are grouped within one slot to notify
whether to transmit the second service data within the grouping, or
it is notified whether the second service data is transmitted in a
slot unit, not a mini slot unit. That is, FIGS. 7A to 7D illustrate
a method for reducing an error that may occur by transmitting only
the minimum indication information in the embodiments of FIGS. 6A
to 6D. That is, FIGS. 7A to 7D illustrate a method for using and
transmitting resources at a plurality of location to improve the
reliability of the indication information and to overcome the
situation that the specific frequency band in which the indication
information is transmitted is in the deep fading.
[0168] Meanwhile, comparing FIGS. 6A to 6D with FIGS. 7A to 7D, in
the case of FIGS. 6A to 6D, the indication information may be
transmitted once in the units of the mini slot, the group unit of
the mini slots, or every slot unit. On the other hand, in the case
of FIGS. 7A to 7D, the indication information may be transmitted
plural times in the units of the mini slot, the group unit of the
mini slots, or every slot unit. Therefore, in the case of FIGS. 7A
to 7D, the acquisition probability of the indication information
can be increased in terms of the receiving terminal as compared
with the case of FIGS. 6A to 6D, thereby providing a more stable
service. On the other hand, the case of FIGS. 7A to 7D may waste
more bandwidth than the case of FIGS. 6A to 6D. Therefore, it is
preferable to set the number of times of the indication information
to be transmitted in the units of each mini slot, the group unit of
the mini slots, or the slot unit to be the appropriate number of
times in terms of the bandwidth and the stability. This may be set
by an experiment in the real environment, or may use a simulation
result obtained by assuming the real environment.
[0169] On the other hand, when the first cell and the second cell
are neighboring to each other, the same frequency resources may be
allocated to different terminals. In this case, the interference
may occur as in FIGS. 5A and 5B described above. In order to
prevent such a case, according to the present disclosure, when
resources are differently allocated to the terminals for each cell
as much as possible or the same resource is allocated to the
terminals, the indication information may be configured to be
transmitted from different locations for each cell. This may apply
the contents described with reference to FIGS. 5A and 5B as they
are, and therefore the additional description will not be omitted
herein.
[0170] As described above, when the transmission region of the
indication information is different depending on resources
allocated to each base station, each cell, or each terminal
resource allocated to the terminal, robustness to the inter-cell
interference signal can be obtained.
[0171] Also, in the case in which the transmission region is
different or the same for each cell when the indication information
is transmitted, the indication information may be transmitted by
boosting the transmit power of the indication information to
increase the reliability of the indication information. In the case
in which the transmission region is different or identical for each
cell when the indication information is transmitted, as another
method for increasing the reliability of the indication
information, the indication information may be transmitted by a
spreading and/or channel encoding method. The spreading and channel
encoding methods may use various techniques. For example, in the
case of the spreading, various techniques such as a sequence based
spreading technique may be used. In the case of the channel
encoding, a simple repetition method, a substantial channel
encoding method or the like may be considered.
[0172] On the other hand, in the above-mentioned types, only the
form in which the indication information is included is assumed.
However, the indication information may not necessarily be
included.
[0173] In one embodiment, the receiving terminal may receive and
decode the first service data on the assumption that the second
service data can be transmitted in the entire band at any time in
advance. However, in this case, since the uncertainty is increased
in the receiving terminal, not only the complexity of the receiving
terminal but also the performance of the decoding may
deteriorate.
[0174] Therefore, the method of providing the indication
information may be considered in various forms. For example, if
there is no receiving terminal requiring the second service data in
the current base station or the cell, on/off of the indication
information may be controlled by the higher signaling information
or the broadcasting information.
[0175] First, the meaning of indicating that the indication
information is turned on may be a method of continuously allocating
a specific resource to information indicating whether a second
service data, that is, a URLLC data transmission is generated, as
described above. Therefore, the data should be configured in a form
except for the resource of the indication information for notifying
whether to transmit the second service data, and the
transmission/reception should be performed. In addition, a method
for transmitting indication information only when the second
service data is generated in the above situation may be considered.
In this case, a method for setting a length of a sequence for
transmitting indication information to make correlation
characteristics excellent and transmitting indicating information
only when a URLLC service data, which is a second service data, is
generated may be considered.
[0176] On the other hand, the fact that the indication information
is turned off may mean that there is no receiving terminal
requiring the second service data in the current base station or
the cell. In this case, there is no indication information. That
is, it may be the case that only general eMBB service data is
transmitted.
[0177] On the other hand, it may have trouble coping with the case
of determining whether there is a terminal for receiving a second
service data in the current base station or the cell. For example,
if there is the receiving terminal requiring the second service
data in neighboring base stations or cells, the receiving terminal
requiring the second service data at any time may perform
communication by being handed over from neighboring cells. In this
case, it is possible to consider both neighboring base stations or
cells.
Contents Including Indication Information
[0178] In the above description, when the second service is
transmitted to the resource allocated to the first service in a
burst in the wireless communication system, various frame
structures for notifying indication information for indicating
whether to transmit the second service from the base station or the
cell to the terminal which is a receiver was described.
Hereinafter, a method of configuring actual indication information
will be described.
[0179] According to the above-mentioned methods, it is possible to
indicate whether the second service data is transmitted in the
corresponding mini slot by including an accurate time index, i.e.,
indication information in all mini slots, and it is possible to
indicate a coarse time index. As the method for indicating whether
to transmit the second service data using the coarse indication
information, a method of configuring a group of mini slots or a
method of performing an indication in units of a slot was
described.
[0180] In the case of FIG. 3C or FIG. 6C in which only one
indication information is transmitted for each mini slot group, one
indication information may consist of 1 bit. Therefore, if there
are two groups of mini slots, a total of two bits are required. At
this time, 1-bit information may be defined as follows. When the
indication information is 0, there is no transmission of the second
service data, that is, the URLLC service data, in the corresponding
group of the mini slots. On the other hand, when the indication
information is 1, there may be the transmission of the second
service data, that is, the URLLC service data, in the corresponding
group of the mini slots.
[0181] On the other hand, in other cases in which reliability is
further increased, if one indication information consists of one
bit, the entire information is required as many as the sum of the
numbers included in each mini slot within the entire one slot.
Therefore, a method that can perform indication in an accurate or
coarse time index according to each embodiment of FIGS. 3A to 7D
was described.
[0182] Also, since the method of FIG. 3D, the method of FIG. 4D,
the method of FIG. 6D, and the methods of FIG. 7D among each
embodiment described above all indicate only whether to transmit
the second service data, that is, the URLLC service data, it can be
seen that the blind detection method is used from the viewpoint of
the time index.
[0183] However, the method for notifying it is not described in the
frequency resource. Therefore, the blind detection method should be
used for the frequency resources. The blind detection method for
the frequency resource will be described in more detail in the
blind detection of the second service to be described below.
[0184] In the above-described methods, in the case in which the
size of the indication information is set to be larger, it may be
configured to indicate a clear time index and a frequency index. In
this case, one indication information may be set to have a size of
3 to 14 bits to notify in which OFDM symbol the second service data
is transmitted or in which mini slot the second service data is
transmitted. That is, the index of the frequency resource as well
as the time index can be indicated more explicitly or implicitly to
some extent. To explicitly notify the frequency resource, a lot of
information is needed. In addition, there may also be a method for
implicitly notifying it to some extent. One embodiment of the
method for implicitly allocating a frequency resource will be
described below. When explicitly notifying the location of the
frequency resource, in the case of notifying in which mini slot and
which frequency resource the second service data is transmitted in
units of a physical resource block (PRB), approximately 10 bits may
be consumed. As described above, whether the second service data is
transmitted and the transmission location can be clearly indicated
in the time resource and the frequency resource. However, as
described above, when the size of the indication information
increases, the bandwidth of the system may be wasted.
[0185] To reduce the waste of resources, in the case of accurately
indicating the time index and coarsely indicating the frequency
resource, 3 to 14 bits may be required depending on the OFDM symbol
index or mini slot index unit. In case of accurately indicating the
time index and coarsely indicating the index of the frequency
resource, when the PRB group index is used, it is possible to
reduce the number of indication information instead of notifying
the accurate frequency resource location information by a few
bits.
[0186] As another method, there may be a method for notifying an
accurate time index and performing the blind detection on the
frequency. Such a method may be the methods shown in FIG. 3A or 3B
or FIG. 4A or 4B or FIG. 6A or 6B or FIG. 7A or 7B described above.
In this case, the number of bits may be determined depending on the
number of mini slot indexes.
[0187] In addition, as briefly described above, it is also possible
not to notify both the time index and the frequency index. In this
case, all the terminals should use the blind detection method to
notify whether the second service data is included in the first
service data. However, as described above, if the blind detection
method is used, the complexity of the terminal may be greatly
increased, which may not be a preferably form.
Method for Transmitting Indication Information
[0188] So far, how to indicate the accurate time index, how to
indicate the accurate frequency index or the like is described
above. Also, it has been described that the indication information
for notifying whether to transmit the second service data may
consist of 1 bit. That is, when the indication information is 0,
there is no transmission of the second service data, that is, the
URLLC service data in the corresponding group of the mini slots,
and when the indication information is 1, there may be the
transmission of the second service data, that is, the URLLC service
in the corresponding group of the mini slots. Of course, when the
value of the indication information is 1, there is no transmission
of the second service data, that is, the URLLC service data in the
corresponding group of the mini slots, and when the value of the
indication information is 0, there may be the transmission of the
second service data, that is, the URLLC service in the
corresponding group of the mini slots.
[0189] Next, the method for transmitting 1-bit indication
information will be described. The indication information may be
transmitted so that the receiving terminal may apply a non-coherent
demodulation method. For example, an orthogonal sequence may be
used, or a constant amplitude zero auto-correlation (CAZAC)
sequence or a Zadoff chu sequence may be used. As another example,
a pseudo random sequence, a complex random pattern, or the like may
be used.
[0190] In one example of the above orthogonal sequence, when the
indication information is `0`, it may be transmitted by being set
as a sequence of `1 1 1 1`, and when the indication information is
`1`, it may be transmitted by being set as a sequence of `1 1 1
-1`. As described above, when a sequence having a length of 4 is
used, the transmission form may be transmitted in the same manner
as the method of FIGS. 8A to 8C.
[0191] FIGS. 8A to 8C are diagrams illustrating a method of
transmitting indication information in a case in which a sequence
length is 4 according to an embodiment of the present
disclosure.
[0192] Referring to FIG. 8A, a resource to which `1` or `-1`, which
is a value of each sequence, is mapped may be a resource element
(RE). That is, as illustrated in FIG. 8A, when the indication
information is `0`, the sequence values of `1, 1, 1, 1` are mapped
to four consecutive REs 801, 802, 803, and 804 in a vertical
direction (same time axis), and when the indication information is
`1`, consecutive sequence values of `-1, -1, 1, 1` may be mapped to
the four consecutive REs 801, 802, 803 and 804 in the vertical
direction (same time axis).
[0193] FIG. 8B illustrates a case in which four REs are formed in a
rectangular shape. In the example of FIG. 8B, when the indication
information is `0`, the sequence value of `1` is consecutively
(same frequency axis) mapped to the two consecutive REs 811 and 812
on the time axis, and then the sequence value of `1` may be
consecutively (same frequency axis) mapped to the consecutive REs
813 and 814 on the frequency axis. In addition, in the example of
FIG. 8B, when the indication information is `1`, the sequence value
of `-1` is consecutively mapped to the two consecutive REs 811 and
812 on the time axis, and then the sequence value of `1` may be
consecutively (same frequency axis) mapped to the consecutive REs
813 and 814 on the time axis.
[0194] As another sequence mapping method, the method of FIG. 8C is
also possible. That is, as illustrated in FIG. 8C, when the
indication information is `0`, the sequence values of `1, 1, 1, 1`
are mapped to four consecutive REs 821, 822, 823, and 824 in a
horizontal direction (same frequency axis), and when the indication
information is `1`, consecutive sequence values of `-1, -1, 1, 1`
may be mapped to the four consecutive REs 821, 822, 823 and 824 in
the horizontal direction (same frequency axis).
[0195] In the above description, the transmission method in which
the receiving method can use the non-coherent demodulation method
was described. However, the case in which the receiving method can
use the coherent demodulation method is possible. The case in which
the receiving terminal can use the coherent demodulation method
will be described.
[0196] To allow the receiving terminal to use the coherent
demodulation method, the transmitter, that is, the base station may
use a repetition method, a short length block code or the like. As
one of the methods, a method for transmitting the same sequence as
the indication information may be used. That is, the repetition
method may be used. As another method, different sequences may be
generated and transmitted as the indication information. That is,
it may be a method of using a short length code block.
[0197] In addition, it is possible to notify whether the second
service data is included from a current (or previous) frequency
index to a next (or current) frequency index as well as whether to
transmit the second service data by applying the sequence to the
second service transmission information. This will be described
with reference to FIG. 9.
[0198] FIG. 9 illustrates the same configuration as that of FIG. 2
described above according to an embodiment of the present
disclosure, but has a difference in that only the second service
data 920 may be transmitted by using only resources that are not
allocated to the third mini slot among the resources 201 of the
eMBB #1 allocated to the first terminal and other terminals.
Therefore, FIG. 9 illustrates the case in which the second service
data is not transmitted in the eMBB #2 resource 202 allocated to
the second terminal, unlike FIG. 2 described above. In addition, to
describe the embodiment of the present disclosure, it is to be
noted that reference numerals different from those of FIG. 2 are
used for only a plurality of indication information 901, 902, 903,
904, 911, 912, 913, and 914 transmitted within the group of the
mini slots.
[0199] Referring to FIG. 9, a method for notifying whether a second
service data is included from a current frequency index to a next
frequency index as well as notifying whether to transmit a second
service data using an orthogonal sequence will be described.
[0200] As the method for using the orthogonal sequence according to
the embodiment of the present disclosure, there is a method for
indicating whether to indicate a range of a coarse frequency index
as well as indicating whether to transmit a second service data in
the corresponding group of the mini slots. For example, when the
second service data is transmitted within the group of the specific
mini slots, the indication information is transmitted by being set
to be 1 to indicate that the second service data is transmitted. In
this case, the meaning of `1` indicates only whether to transmit
the second service data simply within the group of the specific
mini slots. However, when four sequences are used as described
above, it is possible to notify whether there is the transmission
of the second service data within the range from the current
frequency index in which the sequence is transmitted to the
frequency index in which the next sequence is transmitted as well
as whether to transmit the second service data within the group of
specific mini slots.
[0201] When the second service data, that is, the URLLC service
data, exists in the range from the current frequency index to the
next frequency index, the sequence value is set to be `1, 1, -1,
-1`. However, when the second service data, that is, the URLLC
service data does not exists in the range from the current
frequency index to the next frequency index, the sequence value is
set to be `1, -1, 1, -1`. On the other hand, when the second
service data, that is, the URLLC service data does not exist I the
corresponding group of the mini slots, the sequence value of `1, 1,
1, 1` is used as described above.
[0202] Therefore, referring to FIG. 9, the first indication
information 901 located in the first group of the mini slots has a
sequence value of `1, 1, -1, -1`, and it may be indicated that the
second service data, that is, the URLLC service data exists up to
the range in which the next indication information exists. In
addition, the second indication information 902 located in the
first group of the mini slots also has a sequence value of `1, 1,
-1, -1`, and it may be indicated that the second service data, that
is, the URLLC service data exists up to the range in which the next
indication information exists. In addition, the third indication
information 903 located in the first group of the mini slots also
has a sequence value of `1, -1, 1, -1`, and it may be indicated
that the second service data, that is, the URLLC service data does
not exist up to the range in which the next indication information
exists. Similarly, the fourth indication information 904 located in
the first group of the mini slots also has a sequence value of `1,
1, -1, -1`, and it may be indicated that the second service data,
that is, the URLLC service data does not exist up to the range in
which the next indication information exists.
[0203] If this is applied to the second group of the mini slots,
there is no second service data even in any mini slots in the
second group. Therefore, the indication information 911, 912, 913,
and 914 located in the second group all should have a value of `0`.
Therefore, the indication information 911, 912, 913, and 914
located in the second group all may be set to have sequence values
of 1, 1, 1, 1' which is a sequence corresponding to the indication
information `0`.
[0204] In this way, when the second service data is transmitted
through any one of the mini slots in the group of the mini slots,
the coarse time index and the frequency index may be notified.
[0205] Although the above-mentioned embodiment has been described
with reference to FIG. 4C, it is obvious that the indication
information transmission structure described in FIGS. 3A to 7D may
be applied. In addition, in the structure for transmitting the
indication information in the resource allocated to each terminal,
for example, in FIGS. 6A to 7D, since the channel conditions
between the base station and each terminal may be different from
each other, the received signal-to-noise ratios of each terminal
may be different. Therefore, the indication information transmitted
to each terminal may be applied with different modulation methods
and different channel encoding methods or channel encoding rates,
may be mapped by the sequence having different lengths, and may be
transmitted by differently allocating the resource amount used for
the indication information transmission. The case in which each
terminal has the different channel environment as described above
has already been described in the embodiment of FIG. 6A described
above, and therefore the additional description will be
omitted.
Blind Detection Method of Transmission Location of Second
Service
[0206] The frame structure for notifying the transmission of the
second service data when the second service data is transmitted
using at least some of the resources allocated to the first service
data transmission of the specific terminal in the wireless
communication system, the method for transmitting indication
information, the contents of the indication information or the like
will be described. Hereinafter, a method for detecting, by a
receiving terminal, a first service data and a second service data
actually allocated to a specific terminal will be described.
[0207] Hereinafter, a method for identifying, by a receiving
terminal, an eMBB service data which is a first service data and a
URLLC service data which is a second service data will be
described.
[0208] First, referring to FIG. 9, the first terminal may use the
indication information as described above to confirm whether the
second service data is included in the resource area allocated to
the first terminal in the first resource, eMBB #1 resource 201,
allocated to receive the first service data. In addition, in the
case of using the special sequence, the coarse frequency index as
well as the location of the slot may be recognized. However, it is
not possible to exactly recognize how far the second service is
transmitted by the indication information alone. Therefore, if the
receiving terminal does not process and transmit the data to be
able to recognize the second service data, the first terminal
receiving the first service data as well as the terminal receiving
the second service may not be able to process the received
data.
[0209] Accordingly, as one method, the present disclosure proposes
a method for transmitting data by performing specific scrambling on
a second service data, that is, a URLLC service. For example, in
the case of using a scrambling sequence for changing only the phase
of the second service data, the blind detection is possible since
the phases between the second service data and the first service
data are different from each other. As another method, a scrambling
sequence in which the amplitude and the phase are changed together
may be used. In this case, since the amplitudes and the phases
between the second service data and the first service data are
different from each other, the blind detection may be performed
easier.
[0210] There is a method of applying a constant phase shifted QAM
constellation as another method for processing data to allow a
receiving terminal to recognize a second service data. This will be
described with reference to FIGS. 10A and 10B.
[0211] FIGS. 10A and 10B are diagrams for explaining a case of
applying a fixed phase-shifted QAM constellation according to an
embodiment of the present disclosure.
[0212] Referring to FIG. 10A, illustrates a QAM constellation used
to transmit the first service data. That is, it is a constellation
corresponding to a modulation method of data used in a wireless
communication system when a resource is generally allocated and
data is transmitted through the allocated resource. Therefore, the
constellation of FIG. 10A may be used when transmitting the eMBB
service data.
[0213] The present disclosure proposes the form in which the
constellation is changed and used as illustrated in FIG. 10B to
identify the second service data from the first service data. That
is, for the URLLC service data which is the second service data,
the first service data and the second service data may be
identified by using the constellation in which the phase is changed
by 45.degree. in the original constellation diagram.
[0214] Also, the case in which the phase change in the
constellation is 45.degree. may be only one embodiment, and
therefore the phase may be variously changed such as 30.degree.,
60.degree., and 90.degree..
[0215] When the constellations for each service are changed as
illustrated in FIGS. 10A and 10B, this may be predefined or
notified to all terminals in the cell through the URLLC DCI or
RRC.
[0216] It is possible to determine whether the second service data
is transmitted to the area of the resource allocated to the first
service data using an operation such as the following Equation 1 as
a method for identifying, by a receiving terminal, a first service
data from a second service data using the above-mentioned
method.
L k = i = 1 N s log ( 1 M eMBB i = 1 M eMBB 1 .pi..sigma. 2 exp ( -
Y [ l ] - H [ l ] s i eMBB 2 .sigma. 2 ) 1 M URLLC , k i = 1 M
URLLC , k 1 .pi..sigma. 2 exp ( - Y [ l ] - H [ l ] s k , i URLLC 2
.sigma. 2 ) ) Equation 1 ##EQU00001##
In the above Equation 1, [0217] N.sub.s: Number of sample for blind
detection [0218] Y[l]: Receiver signal for lth RE, [0219]
s.sub.l.sup.eMBB: candidate modulation symbol eMBB, [0220] H[l]:
Fading channel coefficient for lth RE, [0221] s.sub.k,i.sup.URLLC:
candidate modulation symbol for URLLC, [0222] M.sub.URLLC,k:
Candidate kth modulation order of URLLC, and [0223] .sigma..sup.2:
Noise variance
[0224] Therefore, if L.sub.k is greater than 0 for all k, it is the
first service data, that is, the eMBB service data, or otherwise,
is not the first service data, that is, the eMBB service data. If
it is not the first service data, it is the URLLC service data
which is the second service data.
[0225] In addition, the phase value or the scrambling sequence may
also be predefined and specified in the standard, or may be
determined in each base station or cell and indicated to the
eMBB/URLLC terminals through the URLLC DCI or RRC. In another form,
the phase or the scrambling sequence may be configured to change at
a constant period, or may also be set to have the same value at all
times.
Configuration and Operation of Base Station Apparatus and Terminal
Apparatus
[0226] FIG. 11 is a block configuration diagram of a base station
apparatus according to an embodiment of the present disclosure.
[0227] FIG. 11 is a functional block diagram in terms of the
transmission of the base station that transmits the first service
data and the second service data according to the present
disclosure. Therefore, the base station may further have other
configurations other than the block configuration of FIG. 11 but
they are parts that may obscure the gist of the present disclosure,
and therefore only an illustrative configuration is
exemplified.
[0228] Referring to FIG. 11, a plurality of antennas and radio
transmitter 1101, a frame configuration unit 1103, a second service
data generator 1110, a first service data generator 1120, a
controller 1130, and a network interface 1140 may be included.
[0229] The network interface 1140 may provide an interface for
communicating with neighboring base stations or cells or for
transmitting or receiving data or control information to or from an
upper node. For example, the network interface 1140 may receive
data to be transmitted to a specific terminal and provide the data
to the controller 1130 and the corresponding data processor. For
example, the network interface 1140 may provide the first service
data to the first service data generator 1120 when the data to be
transmitted to the specific terminal is the first service data, and
provide the second service data to the second service data
generator 1110 when the data to be transmitted to the specific
terminal is the second service data. In addition, when a specific
data is received, the network interface 1140 may notify the
controller 1130 of the specific data.
[0230] The controller 1130 may control to detect the type of the
received data, and in the case of the first service data, perform
scheduling for transmitting the first service data, and then
transmit the first service data through the resource area scheduled
by the first service data generator 1120. In addition, when the
type of the received data is the second service data, the
controller 1130 may control to perform the scheduling for
transmitting the second service data and transmit the corresponding
resource area from the second service data generator 1110.
[0231] In addition, the controller 1130 may generate the indication
information according to the present disclosure and provide the
generated indication information to the frame configuration unit
1103. The indication information may be configured as described
above, and therefore the additional description will be omitted
herein.
[0232] The first service data generator 1120 and the second service
data generator 1110 may all generate data in a manner set in each
of them. At this time, the data generation may mean an operation of
dividing data in a specific unit, modulating data according to a
modulation order, encoding, and the like. That is, it may include
an operation for mapping to the constellation described above.
[0233] Hereinafter, the frame configuration unit 1103 may perform
the mapping to the allocated resources using the data received from
the first service data generator 1120 and the second service data
generator 1110. In addition, the frame configuration unit 1103 may
configure a frame including the indication information received
from the controller 1130. Accordingly, the mapping may be performed
by any of the methods illustrated in FIGS. 2 to 7D described above.
The signal output from the frame configuration unit 1103 is input
to the radio transmitter 1101.
[0234] The radio transmitter 1101 may perform band up-conversion of
a received baseband signal into a radio frequency (RF) signal of a
band set in the radio communication system, amplify power, and
transmit first service data and/or second service data through a
plurality of antennas. In addition, a digital-to-analog converter
may be included between the radio transmitter 1101 and the frame
configuration unit 1103. It should be noted that these specific
configurations may obscure the gist of the present disclosure and
therefore are omitted.
[0235] In the 5G wireless communication system, a very large number
of array antennas may be basically used, and therefore a plurality
of antennas connected to the radio transmitter 1101 are illustrated
in FIG. 11.
[0236] FIG. 12 is a block configuration diagram of a receiving
terminal according to an embodiment of the present disclosure.
[0237] The configuration of FIG. 12 is a functional block diagram
for describing the configuration of the terminal receiving the
first service data. Therefore, it is noted that all of them are
omitted except for the functional configuration for receiving the
first service data.
[0238] Referring to FIG. 12, a wireless receiver 1201 connected to
a plurality of antennas, a communication processor 1210, and a
controller 1220 may be included. The wireless receiver 1201 may
low-noise amplify the received radio signal and perform band
down-conversion of the amplified radio signal to output the
baseband signal.
[0239] The baseband signal converted by the wireless receiver 1201
may be input to the communication processor 1210. It should be
noted that an analog-to-digital converter may be included between
the communication processor 1210 and the wireless receiver 1201,
but it may obscure the gist of the present disclosure and therefore
only an illustrative configuration is exemplified.
[0240] The communication processor 1210 may include an indication
information detector 1211, a service data detector 1212, and a
decoding and demodulation unit 1213. As described above, the
indication information detector 1211 is a configuration for
detecting whether the second service data is transmitted to the
resource allocated for the reception of the first service data, and
may allocate it to the specific resource as described above. The
indication information detector 1211 may detect the indication
information in the received slot, in the mini slot, or in the group
of the mini slots and detect whether the second service data is
included. As described above, it is possible to provide the service
data detector 1212 with whether to detect the second service
data.
[0241] The service data detector 1212 may output the received data
by removing the service data according to whether the second
service data exists in the received data using the received
indication information or output the received data as it is. For
example, if the second service data is included in the specific
mini slot, in the group of the mini slots, or in the slot, the
location of the second service data is detected using one of the
methods described above, the corresponding data is punctured and
then supplied to decoding and demodulation unit. In addition, if
the second service data does not exist in the received data using
the received indication information, the service data detector 1212
may puncture only the indication information from the received data
and provide the received data to the decoding and demodulation unit
1213.
[0242] The decoding and demodulation unit 1213 may demodulate and
decode the corresponding data using the data input from the service
data detector 1212. At this time, the decoding and demodulation
unit 1213 may have different codebooks depending on whether the
second service data exists or not, as described above. Therefore,
the decoding and demodulation unit 1213 may perform decoding and
demodulation using different codebooks according to the case where
the second service data is punctured from the received data and the
second service data is received without the second service
data.
[0243] The controller 1220 may be configured as an application
processor and may receive information processed by the
communication processor. For example, if the first service data is
image data, an operation for processing an image can be performed,
and if the first service data is voice or message data, processing
may be performed accordingly. That is, the controller 1220 may
perform a control according to the application of the electronic
device.
[0244] FIG. 13 is a control flowchart for transmitting a first
service data and a second service data in the base station
according to an embodiment of the present disclosure.
[0245] Referring to FIG. 13, the configuration of the base station
will be described using the configuration of FIG. 11 described
above. In addition, the base station may also be replaced by a cell
or by another control node. Hereinafter, the terminology of the
base station is used for convenience of description.
[0246] The controller 1130 of the base station may check whether
the second service is required to be in an on state at operation
1300. The checking in the operation 1300 may be performed at a
predetermined time period or may be performed when the power of the
base station is turned on. In addition, it is possible to set the
state in which the second service is unconditionally required to be
in an on state without performing the operation 1300. Here, the
checking on whether the second service is required to be in an on
state in a predetermined period unit may be performed by checking
whether the terminal receiving the second service data exists in
the communication area of the current base station or in the
communication area of base stations neighboring to the base
station, and may be set based on the indicated information from the
upper node.
[0247] If it is determined as a result of the check at operation
1300 that the second service is required to be in an on state, the
controller 1130 of the base station proceeds to operation 1302,
otherwise proceeds to operation 1304. Since the second service data
does not generally exist at operation 1304, the first service data
and other service data may be transmitted. However, if the on/off
state of the second service is notified periodically, the second
service off state may be broadcast through the control information
at operation 1304. That is, it indicates that there is no terminal
receiving the URLLC service data, which is the second service data,
among the terminals connected to the base station and may be the
form in which the indication information is inactivated in the
first service data to be transmitted. Other operations 1304
correspond to the operation of transmitting general first service
data only, a description thereof will be omitted herein.
[0248] If the controller 1130 of the base station proceeds to the
operation 1302, the information that the second service is turned
on may be broadcast. The on-state broadcast of the second service
may be transmitted to all the terminals in the base station using
the RRC signal or using other control information. The on-state of
the second service may mean that there is the terminal receiving
the URLLC service data, which is the second service data, among the
terminals connected to the base station and the form in which the
indication information is activated in the first service data to be
transmitted.
[0249] Thereafter, the controller 1130 of the base station proceeds
to operation 1306 to generate the first service data and map the
generated first service data to the resource. In this case, since
the terminal receiving the second service data exists in operation
1306, the controller 1130 of the base station may perform the
mapping considering the resource to which the indication
information is allocated when mapping the first service data. In
addition, the controller 1130 of the base station may perform the
mapping without considering the resource to which the indication
information is allocated when mapping the first service data. In
this case, the base station may be operated to transmit the first
service data using the corresponding resource in the situation in
which the indication information is not transmitted, and puncture
the data of the first service from the resource and transmit the
indication information in the situation in which the indication
information is transmitted.
[0250] Thereafter, the controller 1130 of the base station may
check whether the second service is generated in operation 1308. As
a result of the check in the operation 1308, when the second
service data has been generated, it proceeds to operation 1310 and
when the second service data is not generated, the process proceeds
to operation 1320.
[0251] First, when the second service data is not generated, the
controller 1130 of the base station may transmit the service data
using the mapped resource in the operation 1320. First, if the
second service data is not generated, the controller 1130 of the
base station may control to transmit only the first service data
using the mapped resource. The controller 1130 of the base station
may proceed to operation 1316 after transmitting the specific mini
slot in operation 1320. In operation 1320, the data transmission
unit may be the units of the mini slot, the group unit of the mini
units, or the slot unit. Hereinafter, for the sake of convenience
of description, the description will be made based on the units of
the mini slot.
[0252] On the other hand, if the process goes from operation 1308
to operation 1310, the controller 1130 of the base station may
check whether the transmission is required in the first service
resource. That is, it is checked whether the resource area for
transmitting the second service data should be transmitted through
the resource allocated to the first service data. When the second
service data may be transmitted through another unallocated
resource other than the resource required for transmission of the
first service data, the process may proceed to the operation 1320
after allocating the second service resource. It should be noted
that the contents of allocating the second service data resource
are omitted in FIG. 13. When the resources for the second service
data transmission and the resources for the first service data
transmission do not overlap with each other as described above,
they may be transmitted using the allocated resources.
[0253] On the other hand, as a result of the check in operation
1310, when the transmission is required in the first service
resource, the controller 1130 of the base station proceeds to the
operation 1312 to generate the indication information for notifying
that the second service data is transmitted and puncture the first
service data in the resource transmitting the first service data.
Thereafter, in operation 1314, the controller 1130 of the base
station may control to include the second service data in the
location at which the first service data is punctured and transmit
the data after performing the mapping to include the previously
configured indication information. At this time, the indication
information may be transmitted in the same mini slot as the second
service data, or may be transmitted in the next mini slot. The
location of the mini slot to which the indication information is
transmitted has already been described above, and therefore the
redundant description will be omitted.
[0254] Then, the controller 1130 of the base station proceeds to
operation 1316 to check whether a new slot needs to be transmitted.
Operation 1316 is the same as the operation of checking whether the
transmission of all mini slots included in one slot is completed as
described above. As a result of the check in the operation 1316,
when the transmission of all mini slots is completed, the
controller 1130 of the base station proceeds to the operation 1318,
or otherwise proceeds to the operation 1308.
[0255] If it proceeds from the operation 1316 to the operation
1318, the controller 1130 of the base station may check the on/off
review time of the second service. That is, it is checked whether
the broadcasting time arrives by periodically checking the on/off
of the second service second service. As a result of the check in
operation 1318, when the time to check the on/off of the second
service arrives, the controller 1130 of the base station proceeds
to the operation 1300. However, as a result of the check in the
operation 1318, when the time to check the on/off of the second
service does not arrive, the controller 1130 of the base station
proceeds to the operation 1306.
[0256] FIG. 14 is a control flowchart for receiving a first service
data and a second service data in the receiving terminal according
to an embodiment of the present disclosure.
[0257] Referring to FIG. 14, the configuration of the receiving
terminal will be described using the configuration of FIG. 12
described above. In addition, the receiving terminal may be a
terminal capable of receiving the second service data as well as
the first service data. In addition, the receiving terminal may
also receive other service data. However, since FIG. 14 is a
control flow diagram from the viewpoint of receiving the first
service data, the operation in the terminal receiving the first
service data will be described.
[0258] In operation 1400, the communication processor 1210 of the
terminal may check whether the second service is in an on state
based on information previously received by the base station. If
the second service is in an on state, as a result of the check in
the operation 1400, the communication processor 1210 may proceed to
operation 1402 when the second service is in an on state and
proceed to operation 1420 when the second service is in an off
state. As described above, when the second service is in the off
state, since the indication information may also not be received,
the operation 1420 may be the state in which only the first service
data is received.
[0259] If the communication processor 1210 proceeds to the
operation 1402, it activates the indication information detector
1211, the service data detector 1212, and the decoding and
demodulation unit 1213 described above. The communication processor
1210 may apply a rate matching rule considering the location of the
second service indication information and set a RE mapping rule.
For example, even when only the first service data is transmitted,
it may be transmitted including the indication information.
Therefore, it is possible to set the rate matching considering the
size and location of the indication information, a mapping rule by
which the indication information is mapped to the resource RE, or
the like.
[0260] Thereafter, the communication processor 1210 controls to
receive data through the wireless receiver 1201 in operation 1404,
and proceeds to operation 1406 to generate an LLR value for the
code block CB. In addition, the communication processor 1210 also
decodes the indication information from the received data. The
communication processor 1210 may proceed to operation 1408 to check
whether the second service data exists using the decoded result. It
is determined as a result of the check in the operation 1408 that
when the second service data exists, it proceeds to operation 1410
and when the second service data does not exist, it proceeds to
operation 1412.
[0261] First, if it proceeds to the operation 1412, the
communication processor 1210 may perform the decoding of the first
service data since the second service data is received. The decoded
first service data may be provided to the controller 1220 of the
terminal. In the flowchart of FIG. 14, the contents of the complex
automatic retransmission or the retransmission protocol are
omitted, and it is assumed that the decoding is always
successful.
[0262] On the other hand, as a result of the check in the operation
1408, when the second service data exists, the communication
processor 1210 proceeds to operation 1410 to detect the second
service data from the received data and puncture the second service
data, thereby performing the decoding. The method for detecting a
second service data may be variously configured according to the
method in which the indication information indicates the frequency
index and the time index as described above. That is, when both the
frequency index and the time index are accurately indicated, it can
be detected simply. On the other hand, if at least one of the
frequency index and the time index does not exist or is coarsely
indicated, the blind detection method may be used. The examples for
the blind detection method have already been described above, and
the redundant description will be omitted herein.
[0263] Finally, the communication processor 1210 may proceed to
operation 1414 to check whether the reception of the first service
data is terminated. As a result of the check in the operation 1414,
when the reception of the first service data is terminated, the
communication processor 1210 may terminate the routine. On the
other hand, if the reception of the first service data is not
terminated, the communication processor 1210 may proceed to
operation 1404.
[0264] FIGS. 15A and 15B are simulation result graphs according to
an embodiment of the present disclosure.
[0265] FIG. 15A illustrates a simulation graph of a signal to noise
ratio (SNR) versus a block error rate (BLER) when the present is
applied or not applied in the case in which the QPSK scheme is used
for the first service data and the second service data, that is,
the eMBB service data and the URLLC service data, respectively, and
FIG. 15B illustrates a simulation graph of a SNR versus a BLER when
the present is applied or not applied in the case in which the 16
QAM scheme and the QPSK scheme are used for the first service data
and the second service data, that is, the eMBB service data and the
URLLC service data, respectively.
[0266] Referring to FIG. 15A, reference numeral 1500 denotes a
simulation graph of the SNR versus the BLER when only first service
data is transmitted, and reference numeral 1501 denotes a
simulation graph when the second service data is transmitted by
being included in at least some of the resources allocated to the
first service data and the receiving terminal does not know that
the second service data is transmitted.
[0267] That is, in a normal case, the SNR versus the BLER should be
displayed as in the graph 1500. However, if some of the second
service data is inserted into the resource allocated to the first
service data in a burst manner and if such information is not
provided to the receiving terminal, the phenomenon that the
receiving terminal may not process it in the entire data received
occurs.
[0268] However, by applying the above-mentioned methods, the graph
of the SNR versus the BLER may be changed similarly to the case in
which only the first service data is transmitted as in reference
numerals 1502 or 1503. The simulation graph 1502 is a graph of SNR
versus BLER when the second service data is blind detected and
information on from which of the resources allocated to the first
service data the second service data is transmitted is not
provided. The graph 1503 of the SNR versus BLER having more
improved characteristics than that of reference numeral 1502 is a
graph when the information on from which of the resources allocated
to the first service data the second service data is transmitted is
not provided.
[0269] Compared to the case of originally transmitting only the
first service data, the reason why the graphs 1502 and 1503 are in
the deteriorated form is that some of the first service data to be
originally transmitted may not be transmitted. Therefore, the
deterioration may be inevitable as much as the second service data
is transmitted.
[0270] On the other hand, FIG. 15B can be understood in the same
form as in FIG. 15A. That is, the graphs of FIGS. 15A and 15B of
reference numeral 1510 merely show that the first service data is
changed from the QPSK to the 16 QAM. Therefore, the graph 1500 in
FIG. 15A corresponds to the graph 1510 in FIG. 15B, the graph 1501
in FIG. 15A corresponds to the graph 1511 in FIG. 15B, the graph
1502 in FIG. 15A corresponds to the graph of 1512 in FIG. 15B, and
the graph 1503 in FIG. 15A corresponds to the graph 1513 in FIG.
15B.
[0271] While the present disclosure has been shown and described
with reference to various embodiments thereof, it will be
understood by those skilled in the art that various changes in form
and details may be made therein without departing from the spirit
and scope of the present disclosure as defined by the appended
claims and their equivalents.
* * * * *