U.S. patent application number 15/757152 was filed with the patent office on 2018-09-27 for system message transmission method and device.
The applicant listed for this patent is ZTE Corporation. Invention is credited to Bo DAI, Liujun HU, Shuqiang XIA, Guanghui YU, Yifei YUAN.
Application Number | 20180279257 15/757152 |
Document ID | / |
Family ID | 58238127 |
Filed Date | 2018-09-27 |
United States Patent
Application |
20180279257 |
Kind Code |
A1 |
DAI; Bo ; et al. |
September 27, 2018 |
SYSTEM MESSAGE TRANSMISSION METHOD AND DEVICE
Abstract
Provided are a system message transmission method and device,
which relate to the field of wireless communications. According to
the system message transmission method, a system message is
transmitted at a preset resource location; and a physical downlink
channel is transmitted according to the system message. The system
message may include at least one of: frequency domain location
information of a system, configuration information of a physical
shared channel carrying a system message, configuration information
of terminal access, available resource information of the physical
downlink channel, and radio frame information.
Inventors: |
DAI; Bo; (Shenzhen, CN)
; XIA; Shuqiang; (Shenzhen, CN) ; YU;
Guanghui; (Shenzhen, CN) ; HU; Liujun;
(Shenzhen, CN) ; YUAN; Yifei; (Shenzhen,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ZTE Corporation |
Shenzhen, GD |
|
CN |
|
|
Family ID: |
58238127 |
Appl. No.: |
15/757152 |
Filed: |
August 30, 2016 |
PCT Filed: |
August 30, 2016 |
PCT NO: |
PCT/CN2016/097379 |
371 Date: |
March 2, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 72/005 20130101;
H04L 5/0053 20130101; H04L 5/0048 20130101; H04W 72/082 20130101;
H04W 48/10 20130101 |
International
Class: |
H04W 72/00 20060101
H04W072/00; H04W 48/10 20060101 H04W048/10; H04L 5/00 20060101
H04L005/00; H04W 72/08 20060101 H04W072/08 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 2, 2015 |
CN |
201510557207.3 |
Sep 8, 2015 |
CN |
201510567936.7 |
Claims
1. A system message transmission method, the method comprising:
transmitting a system message at a preset resource location via a
Physical Broadcast Channel (PBCH); and transmitting a physical
downlink channel according to the system message, wherein the
system message comprises at least one of: frequency domain location
information of a system, configuration information of a physical
shared channel carrying the system message, configuration
information of terminal access, available resource information of
the physical downlink channel.
2. (canceled)
3. (canceled)
4. (canceled)
5. The method as claimed in claim 1, wherein the preset resource
location comprises: the PBCH is located on last Y OFDM symbols of a
first slot of a subframe and first X OFDM symbols of a second slot
of the subframe, or, the PBCH is located on any R OFDM symbols in
first predefined OFDM symbols in a subframe, wherein R is equal to
4, 5, 6 or 8, and the first predefined OFDM symbols comprise at
least one of: a second OFDM symbol of each slot, a third OFDM
symbol of each slot, a fourth last OFDM symbol of each slot, and
last two OFDM symbols of each slot.
6. The method as claimed in claim 5, wherein X is equal to 4, 5, 6
or 7, and Y is equal to 0, 1, 2, 3, 4 or 5.
7. The method as claimed in claim 5, wherein the first predefined
OFDM symbols comprise one of the following: when R is equal to 4,
the first predefined OFDM symbols comprise last two OFDM symbols of
each slot; when R is equal to 5, the first predefined OFDM symbols
comprise last two OFDM symbols of each slot and a fourth last OFDM
symbol of a second slot, or, the first predefined OFDM symbols
comprise last two OFDM symbols of each slot and a third OFDM symbol
of a second slot; when R is equal to 6, the first predefined OFDM
symbols comprise last two OFDM symbols of each slot, and a fourth
last OFDM symbol and a second OFDM symbol of a second slot, or, the
first predefined OFDM symbols comprise last two OFDM symbols of
each slot and a fourth last OFDM symbol of each slot, or, the first
predefined OFDM symbols comprise last two OFDM symbols of each
slot, and a second OFDM symbol and a third OFDM symbol of a second
slot; and when R is equal to 8, the first predefined OFDM symbols
comprise a second OFDM symbol, a third OFDM symbol and last two
OFDM symbols of each slot.
8. The method as claimed in claim 1, wherein the PBCH and a
synchronization channel are located on adjacent subframes.
9. The method as claimed in claim 8, wherein he synchronization
channel is located on a subframe #9, and the PBCH is located on a
subframe #0t.
10. The method as claimed in claim 1, wherein the preset resource
location comprises: the PBCH is mapped to T radio frames, and is
located on the same one or more subframes of each radio frame.
11. The method as claimed in claim 10, wherein the one or more
subframes comprise a subframe #0 of a radio frame.
12. The method as claimed in claim 1, wherein the PBCH is
transmitted at an interval of Z1 radio frames, and is repeatedly
transmitted for Z2 times by every Z1*Z2 radio frames.
13. The method as claimed in claim 12, wherein Z1 is equal to 4, 6,
8, 12 or 24, and Z2 is equal to 4, 6, 8, 12 or 16.
14. The method as claimed in claim 1, wherein the PBCH is
demodulated by using a narrowband reference signal, the narrowband
reference signal is transmitted on one or more subframes for
transmitting the PBCH, and the narrowband reference signal is
transmitted on second predefined OFDM symbols, wherein the second
predefined OFDM symbols comprise last two OFDM symbols of each slot
in a subframe, or, each OFDM symbol for transmitting the PBCH.
15. (canceled)
16. (canceled)
17. The method as claimed in claim 1, wherein a physical shared
channel carrying the system message, a synchronization channel and
the PBCH are located on different subframes.
18. (canceled)
19. The method as claimed in claim 1, wherein the configuration
information of the physical shared channel carrying the system
message comprises at least one of: a number of bits for carrying
the system message in the physical shared channel; a number of
subframes occupied by the physical shared channel; and information
of one or more radio frames occupied by the physical shared
channel; or, the configuration information of terminal access
comprises at least one of: whether terminal access is allowed,
system state information, and configuration information of terminal
uplink access resources, wherein the system state information is
used for a terminal to determine whether and/or how to access the
system; or, the available resource information of the physical
downlink channel comprises: information of one or more available
subframes of the physical downlink channel.
20. A system message transmission device, comprising: a system
module, configured to transmit a system message at a preset
resource location via a Physical Broadcast Channel, PBCH; and a
channel module, configured to transmit a physical downlink channel
according to the system message, wherein the system message
comprises at least one of: frequency domain location information of
a system, configuration information of a physical shared channel
carrying the system message, configuration information of terminal
access, available resource information of the physical downlink
channel.
21.-37. (canceled)
38. A system message transmission method, the method comprising:
receiving a system message at a preset resource location via a
Physical Broadcast Channel (PBCH); and receiving a physical
downlink channel according to the system message, wherein the
system message comprises at least one of: frequency domain location
information of a system, configuration information of a physical
shared channel carrying the system message, configuration
information of terminal access, available resource information of
the physical downlink channel.
39. The method as claimed in claim 38, wherein the PBCH and a
synchronization channel are located on adjacent subframes.
40. The method as claimed in claim 39, wherein the synchronization
channel is located on a subframe #9, and the PBCH is located on a
subframe #0.
41. The method as claimed in claim 38, wherein the preset resource
location comprises: the PBCH is mapped to T radio frames, and is
located on the same subframe of each radio frame.
42. The method as claimed in claim 41, wherein the subframe
comprises a subframe #0 of a radio frame.
43. A system message transmission device, configured to: receive a
system message at a preset resource location via a Physical
Broadcast Channel, PBCH; and receive a physical downlink channel
according to the system message, wherein the system message
comprises at least one of: frequency domain location information of
a system, configuration information of a physical shared channel
carrying the system message, configuration information of terminal
access, available resource information of the physical downlink
channel.
Description
TECHNICAL FIELD
[0001] The disclosure relates to, but is not limited to, the field
of wireless communications, and more particularly to a system
message transmission method and device.
BACKGROUND
[0002] A Machine Type Communication (MTC) User Equipment (UE),
which is also referred to as a Machine to Machine (M2M) user
communication equipment, is a main application form of a current
Internet Of Things (IOT). In a 3rd Generation Partnership Project
(3GPP) technical report TR45.820V200, several technologies
applicable to a Cell-IOT (C-IOT) are proposed. Among all the
technologies, a Narrowband Long Term Evolution (NB-LTE) technology
is the most attention-grabbing technology. The system bandwidth of
an NB-LTE system is 200 kHz, identical to the channel bandwidth of
a Global System for Mobile Communication (GSM), which brings great
convenience for reusing a GSM spectrum by an NB-LTE system and
reducing mutual interference between a neighbor channel and a GSM
channel. In addition, the transmission bandwidth of the NB-LTE and
a downlink subcarrier interval are 180 kHz and 15 kHz respectively,
identical to the bandwidth and subcarrier interval of one Physical
Resource Block (PRB) of an LTE system respectively. This not only
facilitates reuse of relevant designs of the relevant LTE system in
the NB-LTE system, but also reduces mutual interference between the
two systems when a GSP spectrum reused by the NB-LTE system is
adjacent to a spectrum of the LTE system.
[0003] In addition, a subcarrier interval of the relevant LTE
system is 15 kHz. The LTE system supports the following six system
bandwidths, i.e., 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz,
and these six bandwidths respectively have 72, 150, 300, 600, 900
and 1200 available subcarriers. Considering that the transmission
bandwidth and downlink subcarrier interval of the NB-LTE system are
the same as the bandwidth and subcarrier interval of one PRB of the
LTE system respectively, the NB-LTE system and the LTE system may
coexist in the same spectrum. For example, in the LTE system of
which the system bandwidth is 20 MHz, a bandwidth of 180 kHz may be
allocated for sending an NB-LTE system signal. However, because
partial resources of the LTE system have been pre-occupied, an
effective solution for ensuring that NB-LTE system and LTE system
signals are not transmitted over the same resource so as to reduce
mutual interference between the two systems is not provided yet at
present.
SUMMARY
[0004] The following is a brief introduction for subject matter
described herein in detail. The brief introduction is not intended
to restrict the scope of protection of claims.
[0005] Some embodiments of the disclosure provide a system message
transmission method and device, which may reduce the interference
between signals during spectrum sharing between different systems,
and reduce the occurrence of simultaneous transmission of different
signals over the same resource by different systems.
[0006] Some embodiments of the disclosure adopt the technical
solutions as follows.
[0007] A system message transmission method may include the steps
as follows.
[0008] A system message may be transmitted at a preset resource
location.
[0009] A physical downlink channel may be transmitted according to
the system message. The system message may include at least one of:
frequency domain location information of a system, configuration
information of a physical shared channel carrying a system message,
configuration information of terminal access, available resource
information of the physical downlink channel, and radio frame
information.
[0010] In an embodiment, the available resource information of the
physical downlink channel may include: information of a start
Orthogonal Frequency Division Multiplexing (OFDM) symbol of the
physical downlink channel in a subframe, and/or information of one
or more unavailable resource elements of the physical downlink
channel in a subframe, and/or information of one or more available
subframes of the physical downlink channel.
[0011] In an embodiment, the method may further include a step of
indicating the information of the one or more unavailable resource
elements via a Cell-specific Reference Signal (CRS) port location
and/or a Channel State Information Reference Signal (CSI-RS) port
location. The indication via the CRS port location and/or the
CSI-RS port location may be determined by a number of ports and/or
a virtual cell identity.
[0012] In an embodiment, the system message may be transmitted at
the preset resource location in a following manner.
[0013] The system message may be transmitted at a preset resource
location via a Physical Broadcast Channel (PBCH).
[0014] In an embodiment, the preset resource location may be
embodied as one of the followings. The PBCH may be located on last
Y OFDM symbols of a first slot of a subframe and first X OFDM
symbols of a second slot of the subframe. Alternatively, the PBCH
may be located on any R OFDM symbols in first predefined OFDM
symbols in a subframe, wherein R may be equal to 4, 5, 6 or 8, and
the first predefined OFDM symbols may include at least one of: a
second OFDM symbol of each slot, a third OFDM symbol of each slot,
a fourth last OFDM symbol of each slot, and last two OFDM symbols
of each slot.
[0015] In an embodiment, X may be equal to 4, 5, 6 or 7, and Y may
be equal to 0, 1, 2, 3, 4 or 5.
[0016] In an embodiment, the first predefined OFDM symbols may
include one of the following:
[0017] when R is equal to 4, the first predefined OFDM symbols may
include last two OFDM symbols of each slot;
[0018] when R is equal to 5, the first predefined OFDM symbols may
include last two OFDM symbols of each slot and a fourth last OFDM
symbol of a second slot, or, the first predefined OFDM symbols may
include last two OFDM symbols of each slot and a third OFDM symbol
of a second slot;
[0019] when R is equal to 6, the first predefined OFDM symbols may
include last two OFDM symbols of each slot, and a fourth last OFDM
symbol and a second OFDM symbol of a second slot, or, the first
predefined OFDM symbols may include last two OFDM symbols of each
slot and a fourth last OFDM symbol of each slot, or, the first
predefined OFDM symbols may include last two OFDM symbols of each
slot, and a second OFDM symbol and a third OFDM symbol of a second
slot; and
[0020] when R is equal to 8, the first predefined OFDM symbols may
include a second OFDM symbol, a third OFDM symbol and last two OFDM
symbols of each slot.
[0021] In an embodiment, the PBCH and a synchronization channel may
be located on adjacent subframes.
[0022] In an embodiment, the PBCH and the synchronization channel
may be located on adjacent subframes which may be embodied as one
of the following:
[0023] the synchronization channel may be located on a subframe #9,
and the PBCH may be located on a subframe #0;
[0024] the synchronization channel may be located on a subframe #0,
and the PBCH may be located on a subframe #9;
[0025] the synchronization channel may be located on a subframe #8,
and the PBCH may be located on a subframe #9;
[0026] the synchronization channel may be located on a subframe #6,
and the PBCH may be located on a subframe #5;
[0027] the synchronization channel may be located on a subframe #4,
and the PBCH may be located on a subframe #5;
[0028] the synchronization channel may be located on a subframe #5,
and the PBCH may be located on a subframe #4;
[0029] the synchronization channel may be located on a subframe #3,
and the PBCH may be located on a subframe #4; and
[0030] the synchronization channel may be located on a subframe #1,
and the PBCH may be located on a subframe #0.
[0031] In an embodiment, the preset resource location may be
embodied as follows. The PBCH may be mapped to T radio frames, and
may be located on the same one or more subframes of each radio
frame, wherein T may be equal to 3, 6, 9, 18 or 36.
[0032] In an embodiment, the one or more subframes may include one
or more of: a subframe #0 of a radio frame, a subframe #4 of a
radio frame, a subframe #5 of a radio frame, or a subframe #9 of a
radio frame.
[0033] In an embodiment, the PBCH may be transmitted at an interval
of Z1 radio frames, and may be repeatedly transmitted for Z2 times
by every Z1*Z2 radio frames.
[0034] In an embodiment, Z1 may be equal to 4, 6, 8, 12 or 24, and
Z2 may be equal to 4, 6, 8, 12 or 16.
[0035] In an embodiment, the PBCH may be demodulated by using a
narrowband reference signal. The narrowband reference signal may be
transmitted on one or more subframes for transmitting the PBCH, and
the narrowband reference signal may be transmitted on second
predefined OFDM symbols. Herein, the second predefined OFDM symbols
may include last two OFDM symbols of each slot in a subframe, or,
each OFDM symbol for transmitting the PBCH.
[0036] In an embodiment, the system message may be transmitted at
the preset resource location in one of the following manners.
[0037] The system message may be transmitted at the preset resource
location via a physical shared channel, or the system message may
be transmitted at the preset resource location via a physical
shared channel and a PBCH.
[0038] In an embodiment, the system message may be transmitted at
the preset resource location via the physical shared channel in a
manner as follows.
[0039] A start OFDM symbol of a physical shared channel carrying
the system message in a subframe may be a fixed value, and
corresponding available resource elements may be remaining
resources after a fixed virtual cell CRS port is removed.
[0040] In an embodiment, the physical shared channel carrying the
system message, a synchronization channel and the PBCH may be
located on different subframes.
[0041] In an embodiment, one or more subframes of the physical
shared channel carrying the system message may include one or more
of a subframe #0, a subframe #4, a subframe #5 and a subframe
#9.
[0042] In an embodiment, the configuration information of the
physical shared channel carrying the system message may include at
least one of:
[0043] a number of bits for carrying the system message in the
physical shared channel;
[0044] a number of subframes occupied by the physical shared
channel; and
[0045] information of one or more radio frames occupied by the
physical shared channel.
[0046] In an embodiment, the configuration information of terminal
access may include:
[0047] whether terminal access is allowed, and/or system state
information, and/or configuration information of terminal uplink
access resources, wherein the system state information may be used
for a terminal to determine whether and/or how to access the
system.
[0048] Some embodiments of the disclosure also provide a system
message transmission device. The device may include a system module
32 and a channel module 34.
[0049] The system module 32 may be configured to transmit a system
message at a preset resource location.
[0050] The channel module 34 may be configured to transmit a
physical downlink channel according to the system message. The
system message may include at least one of: frequency domain
location information of a system, configuration information of a
physical shared channel carrying a system message, configuration
information of terminal access, available resource information of
the physical downlink channel, and radio frame information.
[0051] In an embodiment, the available resource information of the
physical downlink channel may include: information of a start OFDM
symbol of the physical downlink channel in a subframe, and/or
information of one or more unavailable resource elements of the
physical downlink channel in a subframe, and/or information of one
or more available subframes of the physical downlink channel.
[0052] The device may further include an indication module 36. The
indication module 36 may be configured to indicate the information
of the one or more unavailable resource elements via a CRS port
location and/or a CSI-RS port location. The indication via the CRS
port location and/or the CSI-RS port location may be determined by
a number of ports and/or a virtual cell identity.
[0053] In an embodiment, the system module 32 may be configured to
transmit a system message at a preset resource location in a
following manner.
[0054] The system module 32 may be configured to transmit the
system message at the preset resource location via a PBCH.
[0055] In an embodiment, the preset resource location may be
embodied as one of the followings. The PBCH may be located on last
Y OFDM symbols of a first slot of a subframe and first X OFDM
symbols of a second slot of the subframe. Alternatively, the PBCH
may be located on any R OFDM symbols in first predefined OFDM
symbols in a subframe, wherein R is equal to 4, 5, 6 or 8, and the
first predefined OFDM symbols may include at least one of: a second
OFDM symbol of each slot, a third OFDM symbol of each slot, a
fourth last OFDM symbol of each slot, and last two OFDM symbols of
each slot.
[0056] In an embodiment, X may be equal to 4, 5, 6 or 7, and Y may
be equal to 0, 1, 2, 3, 4 or 5.
[0057] In an embodiment, the first predefined OFDM symbols may
include one of the following:
[0058] when R is equal to 4, the first predefined OFDM symbols may
include last two OFDM symbols of each slot;
[0059] when R is equal to 5, the first predefined OFDM symbols may
include last two OFDM symbols of each slot and a fourth last OFDM
symbol of a second slot, or, the first predefined OFDM symbols may
include last two OFDM symbols of each slot and a third OFDM symbol
of a second slot;
[0060] when R is equal to 6, the first predefined OFDM symbols may
include last two OFDM symbols of each slot, and a fourth last OFDM
symbol and a second OFDM symbol of a second slot, or, the first
predefined OFDM symbols may include last two OFDM symbols of each
slot and a fourth last OFDM symbol of each slot, or, the first
predefined OFDM symbols may include last two OFDM symbols of each
slot, and a second OFDM symbol and a third OFDM symbol of a second
slot; and
[0061] when R is equal to 8, the first predefined OFDM symbols may
include a second OFDM symbol, a third OFDM symbol and last two OFDM
symbols of each slot.
[0062] In an embodiment, the PBCH and a synchronization channel may
be located on adjacent subframes.
[0063] In an embodiment, the PBCH and the synchronization channel
may be located on adjacent subframes which may be embodied as one
of the following:
[0064] the synchronization channel may be located on a subframe #9,
and the PBCH may be located on a subframe #0;
[0065] the synchronization channel may be located on a subframe #0,
and the PBCH may be located on a subframe #9;
[0066] the synchronization channel may be located on a subframe #8,
and the PBCH may be located on a subframe #9;
[0067] the synchronization channel may be located on a subframe #6,
and the PBCH may be located on a subframe #5;
[0068] the synchronization channel may be located on a subframe #4,
and the PBCH may be located on a subframe #5;
[0069] the synchronization channel may be located on a subframe #5,
and the PBCH may be located on a subframe #4;
[0070] the synchronization channel may be located on a subframe #3,
and the PBCH may be located on a subframe #4; and
[0071] the synchronization channel may be located on a subframe #1,
and the PBCH may be located on a subframe #0.
[0072] In an embodiment, the preset resource location may be
embodied as follows. The PBCH may be mapped to T radio frames, and
may be located on the same one or more subframes of each radio
frame, wherein T may be equal to 3, 6, 9, 18 or 36.
[0073] In an embodiment, the one or more subframes may include one
or more of: a subframe #0 of a radio frame, a subframe #4 of a
radio frame, a subframe #5 of a radio frame, or a subframe #9 of a
radio frame.
[0074] In an embodiment, the PBCH of the system module 32 may be
transmitted at an interval of Z1 radio frames, and may be
repeatedly transmitted for Z2 times by every Z1*Z2 radio
frames.
[0075] In an embodiment, Z1 may be equal to 4, 6, 8, 12 or 24, and
Z2 may be equal to 4, 6, 8, 12 or 16.
[0076] In an embodiment, the PBCH may be demodulated by using a
narrowband reference signal. The narrowband reference signal may be
transmitted on one or more subframes for transmitting the PBCH, and
the narrowband reference signal may be transmitted on second
predefined OFDM symbols. Herein, the second predefined OFDM symbols
may include last two OFDM symbols of each slot in a subframe, or,
each OFDM symbol for transmitting the PBCH.
[0077] In an embodiment, the system module 32 may be configured to
transmit a system message at a preset resource location in one of
the following manners.
[0078] The system module 32 may be configured to transmit the
system message at the preset resource location via a physical
shared channel, or the system module 32 may be configured to
transmit the system message at the preset resource location via a
physical shared channel and a PBCH.
[0079] In an embodiment, the system module 32 may be configured to
transmit the system message at the preset resource location via the
physical shared channel in a following manner.
[0080] A start OFDM symbol of a physical shared channel carrying
the system message in a subframe may be a fixed value, and
corresponding available resource elements may be remaining
resources after a fixed virtual cell CRS port is removed.
[0081] In an embodiment, the physical shared channel carrying the
system message, a synchronization channel and the PBCH may be
located on different subframes.
[0082] In an embodiment, one or more subframes of the physical
shared channel carrying the system message may include one or more
of a subframe #0, a subframe #4, a subframe #5 and a subframe
#9.
[0083] In an embodiment, the configuration information of the
physical shared channel carrying the system message may include at
least one of:
[0084] a number of bits for carrying the system message in the
physical shared channel;
[0085] a number of subframes occupied by the physical shared
channel; and
[0086] information of one or more radio frames occupied by the
physical shared channel.
[0087] In an embodiment, the configuration information of terminal
access may include:
[0088] whether terminal access is allowed, and/or system state
information, and/or configuration information of terminal uplink
access resources, wherein the system state information may be used
for a terminal to determine whether and/or how to access the
system.
[0089] Some embodiments of the disclosure have the beneficial
effects as follows.
[0090] According to the system message transmission method and
device provided in some embodiments of the disclosure, a system
message may be transmitted at a preset resource location, and then
a physical downlink channel may be transmitted according to the
system message. By the combined use of predetermined transmission
and signaling indication, the interference between signals during
spectrum sharing between different systems may be reduced, and the
occurrence of simultaneous transmission of different signals over
the same resource by different systems may be reduced, thereby
ensuring consistency between a system and a terminal, and improving
the data transmission performance.
[0091] After the drawings and the detailed descriptions are read
and understood, other aspects may be understood.
BRIEF DESCRIPTION OF THE DRAWINGS
[0092] FIG. 1 is a structure diagram of an LTE system frame;
[0093] FIG. 2 is a flowchart of a system message transmission
method according to an embodiment of the disclosure;
[0094] FIG. 3 is a structure diagram of a system message
transmission device according to an embodiment of the disclosure;
and
[0095] FIGS. 4 to 7 are schematic diagrams of locations of
narrowband reference signals according to an embodiment of the
disclosure.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0096] The embodiments of the disclosure will be described below in
conjunction with the drawings. It should be noted that the
embodiments in the present application and the features in the
embodiments may be randomly combined with each other under the
condition of no conflicts.
[0097] A radio frame in an LTE system may follow frame structures
in a Frequency Division Duplex (FDD) mode and a Time Division
Duplex (TDD) mode. The frame structure in the FDD mode is as shown
in FIG. 1. A radio frame of 10 ms may include twenty slots of 0.5
ms, numbered as 0 to 19, and slots 2i and 2i+1 may form a subframe
i of 1 ms. For a normal Cyclic Prefix (CP), each slot may contain 7
symbols of 66.7 us, wherein the CP length of the first symbol is
5.21 us, and the CP lengths of the other six symbols are 4.69 us.
For an extended CP, each slot may contain 6 symbols, and the CP
length of all the symbols are 16.67 us.
[0098] The number of CRS ports in the LTE system may be 1, 2 or 4,
the number of CSI-RS ports may be 1, 2, 4 or 8. Different numbers
of ports may correspond to different numbers of resource elements
and different locations.
[0099] A downlink control channel in the LTE system may be located
on first n OFDM symbols of a subframe, n being 1, 2, 3 or 4.
[0100] The NB-LTE system may adopt single-port transmission. In
addition, because the bandwidth of the NB-LTE system is only 200 k,
time domain resources occupied by a PBCH and a synchronization
signal of the NB-LTE system are increased relative to the LTE
system. Therefore, a method for mapping a PBCH and a
synchronization signal of an LTE system is no longer applicable,
and therefore a new method is desired. Moreover, during spectrum
sharing between the NB-LTE system and the LTE system, if the NB-LTE
system does not avoid using resources used by a downlink control
channel and a downlink reference signal of the LTE system and still
works as if no spectrum is shared and resources are independently
used, the interference between signals of different systems will be
caused, and different systems simultaneously may transmit different
signals over the same resource, thereby affecting UE data
reception. Therefore, the NB-LTE system sends a system message to
an NB-LTE UE to inform of available resources, in order that the
NB-LTE system can perform data transmission according to whether a
spectrum is shared. Meanwhile, consistency between the NB-LTE
system and the NB-LTE UE is also ensured.
[0101] As shown in FIG. 2, an embodiment of the disclosure provides
a system message transmission method, including the steps as
follows.
[0102] In step S202, a system message may be transmitted at a
preset resource location.
[0103] In step S204, a physical downlink channel may be transmitted
according to the system message. The system message may include at
least one of: frequency domain location information of a system,
configuration information of a physical shared channel carrying a
system message, configuration information of terminal access,
available resource information of the physical downlink channel,
and radio frame information.
[0104] The physical downlink channel may include a physical
downlink shared channel and/or a physical downlink control
channel.
[0105] The method in the embodiments of the disclosure may be
applied to the following systems: NB-LTE, or other OFDM systems, or
other narrowband systems. The transmission may include: sending
and/or receiving.
[0106] Herein, the available resource information of the physical
downlink channel may include: information of a start OFDM symbol of
the physical downlink channel in a subframe, and/or information of
one or more unavailable resource elements of the physical downlink
channel in a subframe, and/or information of one or more available
subframes of the physical downlink channel.
[0107] The information of one or more available subframes of the
physical downlink channel may be indicated in one of the following
alternative manners. The available subframes may be periodically
indicated by using a bitmap. Alternatively, unavailable subframes
may be periodically indicated by using a bitmap. For example, J
bits may be used to indicate the availability of each subframe in J
subframes. As such, each bit correspondingly indicates the
availability of one subframe in J subframes, for example, 1
represents Available, and 0 represents Unavailable; or, 0
represents Available, and 1 represents Unavailable. Herein, J may
be equal to 40, 80, 120, 160 or 240.
[0108] The method may further include a step of indicating the
information of the one or more unavailable resource elements via a
CRS port location and/or a CSI-RS port location. The indication via
the CRS port location and/or the CSI-RS port location may be
determined by a number of ports and/or a virtual cell identity.
[0109] The system message may be transmitted at the preset resource
location in the following manner.
[0110] The system message may be transmitted at the preset resource
location via a PBCH.
[0111] The PBCH may be located on last Y OFDM symbols of a first
slot of a subframe and first X OFDM symbols of a second slot of the
subframe.
[0112] Herein, X may be equal to 4, 5, 6 or 7, and Y may be equal
to 0, 1, 2, 3, 4 or 5.
[0113] Alternatively, the PBCH may be located on any R OFDM symbols
in first predefined OFDM symbols in a subframe, wherein R may be
equal to 4, 5, 6 or 8. The first predefined OFDM symbols may
include at least one of: a second OFDM symbol of each slot, a third
OFDM symbol of each slot, a fourth last OFDM symbol of each slot,
and last two OFDM symbols of each slot.
[0114] In an embodiment, when R is equal to 4, the first predefined
OFDM symbols may include last two OFDM symbols of each slot.
[0115] In an embodiment, when R is equal to 5, the first predefined
OFDM symbols may include last two OFDM symbols of each slot and a
fourth last OFDM symbol of a second slot, or, the first predefined
OFDM symbols may include last two OFDM symbols of each slot and a
third OFDM symbol of a second slot.
[0116] In an embodiment, when R is equal to 6, the first predefined
OFDM symbols may include last two OFDM symbols of each slot, and a
fourth last OFDM symbol and a second OFDM symbol of a second slot,
or, the first predefined OFDM symbols may include last two OFDM
symbols of each slot and a fourth last OFDM symbol of each slot,
or, the first predefined OFDM symbols may include last two OFDM
symbols of each slot, and a second OFDM symbol and a third OFDM
symbol of a second slot.
[0117] In an embodiment, when R is equal to 8, the first predefined
OFDM symbols may include a second OFDM symbol, a third OFDM symbol
and last two OFDM symbols of each slot.
[0118] A narrowband reference signal may be transmitted on second
predefined OFDM symbols. The second predefined OFDM symbols may
include: last two OFDM symbols of each slot in a subframe, or, each
OFDM symbol for transmitting the PBCH.
[0119] The narrowband reference signal may be used to demodulate
the PBCH, and the narrowband reference signal may be transmitted on
one or more subframes for transmitting the PBCH.
[0120] The number of antenna ports of the narrowband reference
signal may be equal to 1 or 2. A frequency domain interval of
reference signals of the same port may be 6 subcarriers, and a
frequency domain location offset of reference signals of the same
port on adjacent OFDM symbols may be 3 subcarriers.
[0121] Initial locations of the antenna ports of the narrowband
reference signal may be determined according to a cell
identity.
[0122] When a normal CP is adopted, as shown in FIG. 4 and FIG. 6,
1 is an OFDM symbol index.
[0123] When an extended CP is adopted, as shown in FIG. 5 and FIG.
7, 1 is an OFDM symbol index.
[0124] Herein, R0 indicates a first port, and R1 indicates a second
port.
[0125] In an embodiment, the first predefined symbols are OFDM
symbols on which no CRS of the LTE system is sent. The transmission
of a PBCH on the first predefined symbols may reduce influence of a
CRS on the PBCH, and may particularly reduce mutual influence
between a new system (narrowband system) and an LTE system on the
same spectrum when cell identities corresponding to the two systems
are different.
[0126] In addition, the adoption of the specific first predefined
symbols mentioned above mainly considers influence of the
narrowband reference signal on demodulation performance.
Specifically, an OFDM symbol carrying the PBCH is ensured to the
greatest extent to be located on an OFDM symbol on which the
narrowband reference signal is located. Preferably, the first
predefined OFDM symbols are selected to be in an intermediate
region on an OFDM symbol on which the narrowband reference signal
is located, so that good transmission performance can be
obtained.
[0127] The PBCH and a synchronization channel may be located on
adjacent subframes. Specifically, the locations of the PBCH and the
synchronization channel may be embodied as one of the
followings.
[0128] The synchronization channel may be located on a subframe #9,
and the PBCH may be located on a subframe #0.
[0129] The synchronization channel may be located on a subframe #0,
and the PBCH may be located on a subframe #9.
[0130] The synchronization channel may be located on a subframe #8,
and the PBCH may be located on a subframe #9.
[0131] The synchronization channel may be located on a subframe #6,
and the PBCH may be located on a subframe #5.
[0132] The synchronization channel may be located on a subframe #4,
and the PBCH may be located on a subframe #5.
[0133] The synchronization channel may be located on a subframe #5,
and the PBCH may be located on a subframe #4.
[0134] The synchronization channel may be located on a subframe #3,
and the PBCH may be located on a subframe #4.
[0135] The synchronization channel may be located on a subframe #1,
and the PBCH may be located on a subframe #0.
[0136] The PBCH may be mapped to T radio frames, and may be located
on the same one or more subframes of each radio frame. T may be
equal to 3, 6, 9, 18 or 36. The mapping mentioned herein refers to
single transmission of the PBCH, and resource definition of a
repeated transmission scenario of the PBCH is not involved.
[0137] The one or more subframes may include one or more of a
subframe #0 of a radio frame, a subframe #4 of a radio frame, a
subframe #5 of a radio frame, or a subframe #9 of a radio
frame.
[0138] The PBCH may be transmitted at an interval of Z1 radio
frames, and may be repeatedly transmitted for Z2 times by every
Z1*Z2 radio frames. In the embodiment, Z1 may be equal to 4, 6, 8,
12 or 24, and Z2 may be equal to 4, 6, 8, 12 or 16.
[0139] The system message may be transmitted at the preset resource
location in one of the manners as follows.
[0140] The system message may be transmitted at the preset resource
location via a physical shared channel. Alternatively, the system
message may be transmitted at the preset resource location via a
physical shared channel and a PBCH. In the embodiment, a start OFDM
symbol of a physical shared channel carrying the system message in
a subframe may be a fixed value, and corresponding available
resource elements may be remaining resources after a fixed virtual
cell CRS port is removed.
[0141] The location of the virtual cell CRS port may be the same as
a resource location corresponding to a CRS port (single port, two
ports, and four ports) in a relevant LTE system. The resource
elements corresponding to a four-port CRS in the relevant LTE
system may be selected to serve as resource elements corresponding
to the virtual cell CRS port.
[0142] The physical shared channel carrying the system message, the
synchronization channel and the PBCH may be located on different
subframes. One or more subframes of the physical shared channel
carrying the system message may include one or more of a subframe
#0, a subframe #4, a subframe #5 and a subframe #9.
[0143] For example, the synchronization channel and the PBCH may be
located on the subframe #4 and the subframe #5 (the two subframes
may be exchanged) of a radio frame respectively, and the physical
shared channel carrying the system message may be located on the
subframe #9 and/or the subframe #0. Alternatively, the
synchronization channel and the PBCH may be located on the subframe
#9 and the subframe #0 (the two subframes may be exchanged) of a
radio frame respectively, and the physical shared channel carrying
the system message may be located on the subframe #4 and/or the
subframe #5.
[0144] The physical shared channel carrying the system message may
be located on W successive radio frames, W being equal to 3, 6, 9
or 12.
[0145] As shown in FIG. 3, a system message transmission device may
include a system module 32 and a channel module 34.
[0146] The system module 32 may be configured to transmit a system
message at a preset resource location.
[0147] The channel module 34 may be configured to transmit a
physical downlink channel according to the system message. The
system message may include at least one of: frequency domain
location information of a system, configuration information of a
physical shared channel carrying a system message, configuration
information of terminal access, available resource information of
the physical downlink channel, and radio frame information.
[0148] The available resource information of the physical downlink
channel may include: information of a start OFDM symbol of the
physical downlink channel in a subframe, and/or information of one
or more unavailable resource elements of the physical downlink
channel in a subframe, and/or information of one or more available
subframes of the physical downlink channel.
[0149] The device may further include an indication module 36.
[0150] The indication module 36 may be configured to indicate the
information of the one or more unavailable resource elements via a
CRS port location and/or a CSI-RS port location.
[0151] In an embodiment, the indication via the CRS port location
and/or the CSI-RS port location may be determined by a number of
ports and/or a virtual cell identity.
[0152] Herein, the virtual cell identity is mainly used to indicate
a cell identity of an LTE system during coexistence of a new system
(narrowband system) and the LTE system, so that the reference
signal location can be determined.
[0153] The virtual cell identity may include an LTE cell identity
or a predefined offset value, the predefined offset value being
equal to 0, 1, 2, 3, 4 or 5.
[0154] The information of one or more available subframes of the
physical downlink channel may be indicated in one of the following
alternative manners. The available subframes may be periodically
indicated by using a bitmap. Alternatively, unavailable subframes
may be periodically indicated by using a bitmap. For example, J
bits may be used to indicate the availability of each subframe in J
subframes. As such, each bit correspondingly indicates the
availability of one subframe in J subframes, for example, 1
represents Available, and 0 represents Unavailable; or, 0
represents Available, and 1 represents Unavailable. Herein, J may
be equal to 40, 80, 120, 160 or 240.
[0155] The system module 32 may be configured to transmit a system
message at a preset resource location in the following manner.
[0156] The system module 32 may be configured to transmit the
system message at the preset resource location via a PBCH.
[0157] The preset resource location may be embodied as follows. The
PBCH may be located on last Y OFDM symbols of a first slot of a
subframe and first X OFDM symbols of a second slot of the
subframe.
[0158] In the embodiment, X may be equal to 4, 5, 6 or 7, and Y may
be equal to 0, 1, 2, 3, 4 or 5.
[0159] Alternatively, the PBCH may be located on any R OFDM symbols
in first predefined OFDM symbols in a subframe, wherein R may be
equal to 4, 5, 6 or 8. The first predefined OFDM symbols may
include at least one of: a second OFDM symbol of each slot, a
fourth last OFDM symbol of each slot, last two OFDM symbols of each
slot, and a third OFDM symbol of each slot.
[0160] In an embodiment, when R is equal to 4, the first predefined
OFDM symbols may include last two OFDM symbols of each slot.
[0161] In an embodiment, when R is equal to 5, the first predefined
OFDM symbols may include last two OFDM symbols of each slot and a
fourth last OFDM symbol of a second slot, or, the first predefined
OFDM symbols may include last two OFDM symbols of each slot and a
third OFDM symbol of a second slot.
[0162] In an embodiment, when R is equal to 6, the first predefined
OFDM symbols may include last two OFDM symbols of each slot, and a
fourth last OFDM symbol and a second OFDM symbol of a second slot,
or, the first predefined OFDM symbols may include last two OFDM
symbols of each slot and a fourth last OFDM symbol of each slot,
or, the first predefined OFDM symbols may include last two OFDM
symbols of each slot, and a second OFDM symbol and a third OFDM
symbol of a second slot.
[0163] In an embodiment, when R is equal to 8, the first predefined
OFDM symbols may include a second OFDM symbol, a third OFDM symbol
and last two OFDM symbols of each slot.
[0164] A narrowband reference signal may be transmitted on second
predefined OFDM symbols. The second predefined OFDM symbols may
include: last two OFDM symbols of each slot in a subframe, or, each
OFDM symbol for transmitting the PBCH.
[0165] The narrowband reference signal may be used to demodulate
the PBCH, and the narrowband reference signal may be transmitted on
one or more subframes for transmitting the PBCH.
[0166] The number of antenna ports of the narrowband reference
signal may be equal to 1 or 2. A frequency domain interval of
reference signals of the same port may be 6 subcarriers, and a
frequency domain location offset of reference signals of the same
port on adjacent OFDM symbols may be 3 subcarriers.
[0167] Initial locations of the antenna ports of the narrowband
reference signal may be determined according to a cell
identity.
[0168] The PBCH and a synchronization channel may be located on
adjacent subframes.
[0169] The PBCH and a synchronization channel may be located on
adjacent subframes. Specifically, the locations of the PBCH and the
synchronization channel may be embodied as one of the
followings.
[0170] The synchronization channel may be located on a subframe #9,
and the PBCH may be located on a subframe #0.
[0171] The synchronization channel may be located on a subframe #0,
and the PBCH may be located on a subframe #9.
[0172] The synchronization channel may be located on a subframe #8,
and the PBCH may be located on a subframe #9.
[0173] The synchronization channel may be located on a subframe #6,
and the PBCH may be located on a subframe #5.
[0174] The synchronization channel may be located on a subframe #4,
and the PBCH may be located on a subframe #5.
[0175] The synchronization channel may be located on a subframe #5,
and the PBCH may be located on a subframe #4.
[0176] The synchronization channel may be located on a subframe #3,
and the PBCH may be located on a subframe #4.
[0177] The synchronization channel may be located on a subframe #1,
and the PBCH may be located on a subframe #0.
[0178] The PBCH may be mapped to T radio frames, and may be located
on the same one or more subframes of each radio frame.
[0179] The one or more subframes may include one or more of a
subframe #0 of a radio frame, a subframe #4 of a radio frame, a
subframe #5 of a radio frame, or a subframe #9 of a radio
frame.
[0180] The PBCH of the system module 32 may be transmitted at an
interval of Z1 radio frames, and may be repeatedly transmitted for
Z2 times by every Z1*Z2 radio frames.
[0181] In the embodiment, Z1 may be equal to 4, 6, 8, 12 or 24, and
Z2 may be equal to 4, 6, 8, 12 or 16.
[0182] The system module 32 may be configured to transmit a system
message at a preset resource location in one of the following
manners.
[0183] The system module 32 may be configured to transmit the
system message at the preset resource location via a physical
shared channel. Alternatively, the system module 32 may be
configured to transmit the system message at the preset resource
location via a physical shared channel and a PBCH.
[0184] The system message may be transmitted at the preset resource
location via the physical shared channel in a following manner.
[0185] A start OFDM symbol of a physical shared channel carrying
the system message in a subframe may be a fixed value, and
corresponding available resource elements may be remaining
resources after a fixed virtual cell CRS port is removed.
[0186] The physical shared channel carrying the system message, the
synchronization channel and the PBCH may be located on different
subframes.
[0187] One or more subframes of the physical shared channel
carrying the system message may include one or more of a subframe
#0, a subframe #4, a subframe #5 and a subframe #9.
First Embodiment
[0188] The information of the start OFDM symbol may include two or
four states.
[0189] In the embodiment, a 1 bit signaling may be included to
represent available resource information of the physical downlink
channel.
[0190] Two resource mapping modes may be predefined and indicated
by 1 bit signaling. The available resource information of the
physical downlink channel can be indicated by the signaling.
[0191] For example, the first mapping mode may include: a physical
downlink channel is mapped starting from a first OFDM symbol of a
subframe, and/or corresponding available resource elements may be
remaining resources after a fixed single-port virtual cell CRS is
removed; and the second mapping mode may include: a physical
downlink channel is mapped starting from a fourth OFDM symbol of a
subframe, and/or corresponding available resource elements may be
remaining resources after a fixed four-port virtual cell CRS is
removed.
[0192] Alternatively,
[0193] the first mapping mode may include: a physical downlink
channel is mapped starting from a first OFDM symbol of a subframe,
and/or corresponding available resource elements may be remaining
resources after a fixed single-port virtual cell CRS is removed;
and the second mapping mode may include: a physical downlink
channel is mapped starting from a fifth OFDM symbol of a subframe,
and/or corresponding available resource elements may be remaining
resources after a fixed four-port virtual cell CRS is removed.
[0194] An alternative manner is: defining signaling respectively
for the information of the start OFDM symbol of the physical
downlink channel in a subframe and the information of one or more
available resource elements of the physical downlink channel in a
subframe.
[0195] The information of the start OFDM symbol of the physical
downlink channel in a subframe may occupy 1 bit, indicating a first
OFDM symbol, or a k.sup.th OFDM symbol, where k is equal to 3, 4 or
5 optionally. Alternatively, the information of the start OFDM
symbol of the physical downlink channel in a subframe may occupy 2
bits, indicating first, second, third or fourth OFDM symbol.
[0196] The information of one or more available resource elements
of the physical downlink channel in a subframe may be indicated via
a CRS port location and/or a CSI-RS port location. The CRS port
location may be 1, 2 or 4, or, the CRS port location may be 1 or
4.
[0197] The CSI-RS port location may be Null, or may be one or more
selected CSI-RS resource configuration indexes in a relevant LTE
system. The CSI-RS port location being Null represents that no
CSI-RS is sent.
Second Embodiment
[0198] Because a CRS is only located on first two OFDM symbols on a
subframe of an LTE system Multimedia Broadcast multicast service
Signal Frequency Network (MBSFN) and a PBCH is demodulated by the
CRS and/or a synchronization channel, the PBCH may be located on
non-MBSFN subframes (0, 4, 5, 9).
[0199] Locating of a synchronization signal on an MBSFN subframe
may avoid influence of a CRS of an LTE system on the
synchronization signal. However, this may limit multicast service
transmission. Therefore, a PBCH mapping solution is provided for
two scenarios, i.e., a scenario in which the synchronization signal
is located on MBSFN subframes (1, 2, 3, 6, 7, 8) and a scenario in
which the synchronization signal is not located on MBSFN subframes
(0, 4, 5, 9). The mapping solution may include transmitting the
system message at the preset resource location via a PBCH.
[0200] The preset resource location may be embodied as follows. The
PBCH may be located on last Y OFDM symbols of a first slot of a
subframe and first X OFDM symbols of a second slot of the
subframe.
[0201] In the embodiment, X may be equal to 4, 5, 6 or 7, and Y may
be equal to 0, 1, 2, 3, 4 or 5.
[0202] Alternatively, the PBCH may be located on any R OFDM symbols
in first predefined OFDM symbols in a subframe, wherein R may be
equal to 4, 5, 6 or 8, and the first predefined OFDM symbols may
include at least one of: a second OFDM symbol of each slot, a
fourth last OFDM symbol of each slot, last two OFDM symbols of each
slot, and a third OFDM symbol of each slot.
[0203] The above description indicates that a PBCH may be located
on an adjacent subframe different from the subframe of a
synchronization channel. However, it is not limited that a PBCH is
present on an adjacent subframe of a synchronization channel for
sure. The number of subframes occupied by the synchronization
channel may be greater than or equal to the number of subframes
occupied by the PBCH.
[0204] For example, primary synchronization signals may be located
on subframes #k of odd-indexed radio frames, and secondary
synchronization signals may be located on subframes #k of
even-indexed radio frames, wherein k may be equal to 1, 2, 3, 6, 7
or 8. Alternatively, primary synchronization signals may be located
on subframes #k of even-indexed radio frames, and secondary
synchronization signals may be located on subframes #k of
odd-indexed radio frames, wherein k may be equal to 1, 2, 3, 6, 7
or 8. The subframes may be numbered starting from 0.
[0205] Alternatively, the primary synchronization signals may be
located on subframes #k of odd-indexed radio frames, and the
secondary synchronization signals may be located on subframes #k of
even-indexed radio frames, wherein k may be equal to 0, 4, 5 or 9.
Alternatively, the primary synchronization signals may be located
on subframes #k of even-indexed radio frames, and the secondary
synchronization signals may be located on subframes #k of
odd-indexed radio frames, wherein k may be equal to 0, 4, 5 or 9.
The subframes may be numbered starting from 0.
[0206] The PBCH may be mapped to a subframe #k of each radio frame
by taking 6 successive radio frames as a period, wherein k may be
equal to 0, 4, 5 or 9. Alternatively, the PBCH may be mapped to
subframes #k of first three radio frames within each period by
taking 6 successive radio frames as a period, wherein k may be
equal to 0, 4, 5 or 9. Alternatively, the PBCH may be mapped to a
subframe #k of each radio frame by taking 8 successive radio frames
as a period, wherein k may be equal to 0, 4, 5 or 9.
Third Embodiment
[0207] In this embodiment, the transmission may include: sending
and/or receiving.
[0208] The sending process may include steps as follows. An NB-LTE
base station sends a system message to an NB-LTE terminal, and the
NB-LTE base station sends a physical downlink channel to the NB-LTE
terminal according to the system message.
[0209] The NB-LTE base station may send a system message to the
NB-LTE terminal at a preset resource location.
[0210] The NB-LTE base station may send a physical downlink channel
to the NB-LTE terminal according to the system message. The system
message may include at least one of: frequency domain location
information of a system, configuration information of a physical
shared channel carrying a system message, configuration information
of terminal access, available resource information of the physical
downlink channel, and radio frame information.
[0211] The NB-LTE frequency domain location information is mainly
used to generate a CRS sequence. The CRS sequence may be generated
based on an LTE system CRS sequence generation method. Therefore, a
frequency domain location corresponding to NB-LTE to generate the
CRS sequence may be determined.
[0212] The configuration information of a physical shared channel
carrying a system message may include at least one of: a number of
bits for carrying the system message in the physical shared
channel, a number of subframes occupied by the physical shared
channel, and information of one or more radio frames occupied by
the physical shared channel.
[0213] The configuration information of terminal access may
include: whether terminal access is allowed, and/or system state
information, and/or configuration information of terminal uplink
access resources.
[0214] The system state information may be used for a terminal to
determine whether and/or how to access the system.
[0215] The available resource information of the physical downlink
channel may include: information of a start OFDM symbol of the
physical downlink channel in a subframe, and/or information of one
or more unavailable resource elements of the physical downlink
channel in a subframe, and/or information of one or more available
subframes of the physical downlink channel.
[0216] The information of one or more available subframes of the
physical downlink channel may be indicated in one of the following
manners. The available subframes may be indicated periodically by
using a bitmap. Alternatively, unavailable subframes may be
indicated periodically by using a bitmap. For example, J bits may
be used to indicate the availability of each subframe in J
subframes. As such, each bit correspondingly indicates the
availability of one subframe in J subframes, for example, 1
represents Available, and 0 represents Unavailable; or, 0
represents Available, and 1 represents Unavailable. Herein, J may
be 40, 80, 120, 160 or 240.
[0217] The information of the one or more unavailable resource
elements may be indicated via a CRS port location and/or a CSI-RS
port location. The indication via the CRS port location and/or the
CSI-RS port location may be determined by a number of ports and/or
a virtual cell identity.
[0218] The system message may be transmitted at a preset resource
location in the following manner. The system message may be
transmitted at a preset resource location via a PBCH.
[0219] The preset resource location may be embodied as follows. The
PBCH may be located on last Y OFDM symbols of a first slot of a
subframe and first X OFDM symbols of a second slot of the
subframe.
[0220] In the embodiment, X may be equal to 4, 5, 6 or 7, and Y may
be equal to 0, 1, 2, 3, 4 or 5.
[0221] The PBCH may be located on any R OFDM symbols in first
predefined OFDM symbols in a subframe, wherein R may be equal to 4,
5, 6 or 8. The first predefined OFDM symbols may include at least
one of: a second OFDM symbol of each slot, a fourth last OFDM
symbol of each slot, last two OFDM symbols of each slot, and a
third OFDM symbol of each slot.
[0222] In an embodiment, when R is equal to 4, the first predefined
OFDM symbols may include last two OFDM symbols of each slot.
[0223] In an embodiment, when R is equal to 5, the first predefined
OFDM symbols may include last two OFDM symbols of each slot and a
fourth last OFDM symbol of a second slot, or, the first predefined
OFDM symbols may include last two OFDM symbols of each slot and a
third OFDM symbol of a second slot.
[0224] In an embodiment, when R is equal to 6, the first predefined
OFDM symbols may include last two OFDM symbols of each slot, and a
fourth last OFDM symbol and a second OFDM symbol of a second slot,
or, the first predefined OFDM symbols may include last two OFDM
symbols of each slot and a fourth last OFDM symbol of each slot,
or, the first predefined OFDM symbols may include last two OFDM
symbols of each slot, and a second OFDM symbol and a third OFDM
symbol of a second slot.
[0225] In an embodiment, when R is equal to 8, the first predefined
OFDM symbols may include a second OFDM symbol, a third OFDM symbol
and last two OFDM symbols of each slot.
[0226] The PBCH and a synchronization channel may be located on
adjacent subframes.
[0227] The PBCH and a synchronization channel may be located on
adjacent subframes which may be embodied as one of the
following:
[0228] the synchronization channel may be located on a subframe #9,
and the PBCH may be located on a subframe #0;
[0229] the synchronization channel may be located on a subframe #0,
and the PBCH may be located on a subframe #9;
[0230] the synchronization channel may be located on a subframe #8,
and the PBCH may be located on a subframe #9;
[0231] the synchronization channel may be located on a subframe #6,
and the PBCH may be located on a subframe #5;
[0232] the synchronization channel may be located on a subframe #4,
and the PBCH may be located on a subframe #5;
[0233] the synchronization channel may be located on a subframe #5,
and the PBCH may be located on a subframe #4;
[0234] the synchronization channel may be located on a subframe #3,
and the PBCH may be located on a subframe #4; and
[0235] the synchronization channel may be located on a subframe #1,
and the PBCH may be located on a subframe #0.
[0236] The preset resource location may be embodied as follows. The
PBCH may be mapped to T radio frames, and may be located on the
same one or more subframes of each radio frame.
[0237] The one or more subframes may include one or more of a
subframe #0 of a radio frame, a subframe #4 of a radio frame, a
subframe #5 of a radio frame, or a subframe #9 of a radio
frame.
[0238] The PBCH may be transmitted at an interval of Z1 radio
frames, and may be repeatedly transmitted for Z2 times by every
Z1*Z2 radio frames.
[0239] In the embodiment, Z1 may be equal to 4, 6, 8, 12 or 24, and
Z2 may be equal to 4, 6, 8, 12 or 16.
[0240] The system message may be transmitted at a preset resource
location in one of the following manners.
[0241] The system message may be transmitted at a preset resource
location via a physical shared channel. Alternatively, the system
message may be transmitted at a preset resource location via a
physical shared channel and a PBCH.
[0242] The system message may be transmitted at a preset resource
location via a physical shared channel in the following manner.
[0243] A start OFDM symbol of a physical shared channel carrying
the system message in a subframe may be a fixed value, and
corresponding available resource elements may be remaining
resources after a fixed virtual cell CRS port is removed.
[0244] The physical shared channel carrying the system message, the
synchronization channel and the PBCH may be located on different
subframes.
[0245] One or more subframes of the physical shared channel
carrying the system message may include one or more of a subframe
#0, a subframe #4, a subframe #5 and a subframe #9.
[0246] The receiving process may include the following steps. The
NB-LTE terminal receives a system message sent by the NB-LTE base
station, and the NB-LTE terminal receives a physical downlink
channel according to the system message.
[0247] Herein, the system message may include at least one of:
frequency domain location information of a system, configuration
information of a physical shared channel carrying a system message,
configuration information of terminal access, available resource
information of the physical downlink channel, and radio frame
information.
[0248] The available resource information of the physical downlink
channel may include: information of a start OFDM symbol of the
physical downlink channel in a subframe, and/or information of one
or more unavailable resource elements of the physical downlink
channel in a subframe, and/or information of one or more available
subframes of the physical downlink channel.
[0249] The information of one or more available subframes of the
physical downlink channel may be indicated in one of the following
alternative manners. The available subframes may be indicated
periodically by using a bitmap. Alternatively, the unavailable
subframes may be indicated periodically by using a bitmap. For
example, J bits may be used to indicate the availability of each
subframe in J subframes. As such, each bit correspondingly
indicates the availability of one subframe in J subframes, for
example, 1 represents Available, and 0 represents Unavailable; or,
0 represents Available, and 1 represents Unavailable. Herein, J may
be 40, 80, 120, 160 or 240.
[0250] The information of the one or more unavailable resource
elements may be indicated via a CRS port location and/or a CSI-RS
port location. The indication via the CRS port location and/or the
CSI-RS port location may be determined by a number of ports and/or
a virtual cell identity.
[0251] The system message may be transmitted at a preset resource
location in the following manner. The system message may be
transmitted at a preset resource location via a PBCH.
[0252] The preset resource location may be embodied as follows. The
PBCH may be located on last Y OFDM symbols of a first slot of a
subframe and first X OFDM symbols of a second slot of the
subframe.
[0253] In the embodiment, X may be equal to 4, 5, 6 or 7, and Y may
be equal to 0, 1, 2, 3, 4 or 5.
[0254] The PBCH may be located on any R OFDM symbols in first
predefined OFDM symbols in a subframe, wherein R may be equal to 4,
5, 6 or 8. The first predefined OFDM symbols may include at least
one of: a second OFDM symbol of each slot, a fourth last OFDM
symbol of each slot, last two OFDM symbols of each slot, and a
third OFDM symbol of each slot.
[0255] In an embodiment, when R is equal to 4, the first predefined
OFDM symbols may include last two OFDM symbols of each slot.
[0256] In an embodiment, when R is equal to 5, the first predefined
OFDM symbols may include last two OFDM symbols of each slot and a
fourth last OFDM symbol of a second slot, or, the first predefined
OFDM symbols may include last two OFDM symbols of each slot and a
third OFDM symbol of a second slot.
[0257] In an embodiment, when R is equal to 6, the first predefined
OFDM symbols may include last two OFDM symbols of each slot, and a
fourth last OFDM symbol and a second OFDM symbol of a second slot,
or, the first predefined OFDM symbols may include last two OFDM
symbols of each slot and a fourth last OFDM symbol of each slot,
or, the first predefined OFDM symbols may include last two OFDM
symbols of each slot, and a second OFDM symbol and a third OFDM
symbol of a second slot.
[0258] In an embodiment, when R is equal to 8, the first predefined
OFDM symbols may include a second OFDM symbol, a third OFDM symbol
and last two OFDM symbols of each slot.
[0259] The PBCH and a synchronization channel may be located on
adjacent subframes.
[0260] The PBCH and a synchronization channel may be located on
adjacent subframes which may be embodied as one of the
following:
[0261] the synchronization channel may be located on a subframe #9,
and the PBCH may be located on a subframe #0;
[0262] the synchronization channel may be located on a subframe #0,
and the PBCH may be located on a subframe #9;
[0263] the synchronization channel may be located on a subframe #8,
and the PBCH may be located on a subframe #9;
[0264] the synchronization channel may be located on a subframe #6,
and the PBCH may be located on a subframe #5;
[0265] the synchronization channel may be located on a subframe #4,
and the PBCH may be located on a subframe #5;
[0266] the synchronization channel may be located on a subframe #5,
and the PBCH may be located on a subframe #4;
[0267] the synchronization channel may be located on a subframe #3,
and the PBCH may be located on a subframe #4; and
[0268] the synchronization channel may be located on a subframe #1,
and the PBCH may be located on a subframe #0.
[0269] The preset resource location may be embodied as follows. The
PBCH may be mapped to T radio frames, and may be located on the
same one or more subframes of each radio frame.
[0270] The one or more subframes may include one or more of a
subframe #0 of a radio frame, a subframe #4 of a radio frame, a
subframe #5 of a radio frame, or a subframe #9 of a radio
frame.
[0271] The PBCH may be transmitted at an interval of Z1 radio
frames, and may be repeatedly transmitted for Z2 times by every
Z1*Z2 radio frames.
[0272] In the embodiment, Z1 may be equal to 4, 6, 8, 12 or 24, and
Z2 may be equal to 4, 6, 8, 12 or 16.
[0273] The system message may be transmitted at a preset resource
location in one of the following manners.
[0274] The system message may be transmitted at a preset resource
location via a physical shared channel. Alternatively, the system
message may be transmitted at a preset resource location via a
physical shared channel and a PBCH.
[0275] The system message may be transmitted at a preset resource
location via a physical shared channel in the following manner.
[0276] A start OFDM symbol of a physical shared channel carrying
the system message in a subframe may be a fixed value, and
corresponding available resource elements may be remaining
resources after a fixed virtual cell CRS port is removed.
[0277] The physical shared channel carrying the system message, the
synchronization channel and the PBCH may be located on different
subframes.
[0278] One or more subframes of the physical shared channel
carrying the system message may include one or more of a subframe
#0, a subframe #4, a subframe #5 and a subframe #9.
Fourth Embodiment
[0279] The system message may include available resource
information and radio frame information of the physical downlink
channel and may be carried by a PBCH.
[0280] Two resource mapping modes are predefined, and indicated by
1 bit signaling. The available resource information of the physical
downlink channel may be indicated by the signaling.
[0281] The available resource information of the physical downlink
channel may include information of a start OFDM symbol of the
physical shared channel in a subframe and information of one or
more available resource elements of the physical shared channel in
a subframe.
[0282] A first mapping mode may include: a physical downlink
channel is mapped starting from a first OFDM symbol of a subframe,
and corresponding available resource elements may be remaining
resources after a fixed single-port virtual cell CRS is
removed.
[0283] A second mapping mode may include: a physical downlink
channel is mapped starting from a fourth OFDM symbol of a subframe,
and corresponding available resource elements may be remaining
resources after a fixed four-port virtual cell CRS is removed.
[0284] The synchronization channel may be located on a subframe #9
of a radio frame, and the PBCH may be located on a subframe #0 of
the radio frame. Alternatively, the PBCH may be located on a
subframe #9 of a radio frame, and the synchronization channel may
be located on a subframe #0 of the radio frame. Alternatively, the
synchronization channel may be located on a subframe #4 of a radio
frame, and the PBCH may be located on a subframe #5 of the radio
frame. Alternatively, the synchronization channel may be located on
a subframe #5 of a radio frame, and the PBCH may be located on a
subframe #4 of the radio frame.
[0285] The PBCH may be located on last Y OFDM symbols of a first
slot of a subframe and first X OFDM symbols of a second slot of the
subframe, wherein X may be equal to 4, 5, 6 or 7, and Y may be
equal to 0, 1, 2, 3, 4 or 5.
[0286] The PBCH may be transmitted at an interval of Z1 radio
frames, and may be repeatedly transmitted for Z2 times by every
Z1*Z2 radio frames. Herein, Z1 may be equal to 6, 8, 12 or 24, and
Z2 may be equal to 4, 6, 8, 12 or 16.
[0287] For example, the symbol may include first four or five OFDM
symbols of a second slot of a subframe, or, the last OFDM symbol of
a first slot of a subframe and first four OFDM symbols of a second
slot of the subframe, or, last two OFDM symbols of a first slot of
a subframe and first four OFDM symbols of a second slot of the
subframe, or, last two OFDM symbols of a first slot of a subframe
and first six OFDM symbols of a second slot of the subframe, or,
last three OFDM symbols of a first slot of a subframe and first
five OFDM symbols of a second slot of the subframe, or, last five
OFDM symbols of a first slot of a subframe and first seven OFDM
symbols of a second slot of the subframe, or, last three OFDM
symbols of a first slot of a subframe and all OFDM symbols of a
second slot of the subframe.
[0288] The mapping method may reduce the number of subframes for
mapping a PBCH and reduce the transmission delay, and different CP
types may adopt a unified design solution to the greatest
extent.
[0289] The PBCH may be mapped to six successive radio frames, and
may be located on a fixed subframe #Y1 of each radio frame. Y1 may
be equal to one or more of 0, 4, 5 and 9. The PBCH may be
transmitted for four times within each period by taking 24 radio
frames as a period.
[0290] Alternatively, the PBCH may be mapped to first three
successive radio frames of every six radio frames, and may be
located on a fixed subframe #Y1 of each radio frame. Y1 may be
equal to one or more of 0, 4, 5 and 9. The PBCH may be transmitted
for four times within each period by taking 24 radio frames as a
period.
[0291] Alternatively, the PBCH may be mapped to eight successive
radio frames, and may be located on a fixed subframe #Y1 of each
radio frame. Y1 may be equal to one or more of 0, 4, 5 and 9. The
PBCH may be transmitted for eight times within each period by
taking 64 radio frames as a period.
[0292] Alternatively, the PBCH may be mapped to eight successive
radio frames, and may be located on a fixed subframe #Y1 of each
radio frame. Y1 may be equal to one or more of 0, 4, 5 and 9. The
PBCH may be transmitted for six times within each period by taking
48 radio frames as a period.
[0293] Alternatively, the PBCH may be mapped to eight successive
radio frames, and may be located on a fixed subframe #Y1 of each
radio frame. Y1 may be equal to one or more of 0, 4, 5 and 9. The
PBCH may be transmitted for 12 times within each period by taking
96 radio frames as a period.
Fifth Embodiment
[0294] The system message may include frequency domain location
information of a system, configuration information of a physical
shared channel carrying a system message, configuration information
of terminal access, and radio frame information. The system message
may be carried by a PBCH.
[0295] The synchronization channel may be located on a subframe #8
of a radio frame, and the PBCH may be located on a subframe #9 of
the radio frame. Alternatively, the synchronization channel may be
located on a subframe #6 of a radio frame, and the PBCH may be
located on a subframe #5 of the radio frame. Alternatively, the
synchronization channel may be located on a subframe #3 of a radio
frame, and the PBCH may be located on a subframe #4 of the radio
frame. Alternatively, the synchronization channel may be located on
a subframe #1 of a radio frame, and the PBCH may be located on a
subframe #0 of the radio frame.
[0296] The PBCH may be located on last Y OFDM symbols of a first
slot of a subframe and first X OFDM symbols of a second slot of the
subframe, wherein X may be equal to 4, 5, 6 or 7, and Y may be
equal to 0, 1, 2, 3, 4 or 5.
[0297] The PBCH may be transmitted at an interval of Z1 radio
frames, and may be repeatedly transmitted for Z2 times by every
Z1*Z2 radio frames. Z1 may be equal to 6, 8, 12 or 24, and Z2 may
be equal to 4, 6, 8, 12 or 16.
[0298] For example, the symbol may include first four or five OFDM
symbols of a second slot of a subframe, or, the last OFDM symbol of
a first slot of a subframe and first four OFDM symbols of a second
slot of the subframe, or, last two OFDM symbols of a first slot of
a subframe and first four OFDM symbols of a second slot of the
subframe, or, last two OFDM symbols of a first slot of a subframe
and first six OFDM symbols of a second slot of the subframe, or,
last three OFDM symbols of a first slot of a subframe and first
five OFDM symbols of a second slot of the subframe, or, last five
OFDM symbols of a first slot of a subframe and first seven OFDM
symbols of a second slot of the subframe, or, last three OFDM
symbols of a first slot of a subframe and all OFDM symbols of a
second slot of the subframe.
[0299] The mapping method may reduce the number of subframes for
mapping a PBCH and reduce the transmission delay. Different CP
types may adopt a unified design solution to the greatest
extent.
[0300] The PBCH may be mapped to six successive radio frames, and
may be located on a fixed subframe #Y1 of each radio frame. Y1 may
be equal to one or more of 0, 4, 5 and 9. The PBCH may be
transmitted for four times within each period by taking 24 radio
frames as a period. Alternatively, the PBCH may be mapped to first
three successive radio frames of every six radio frames, and may be
located on a fixed subframe #Y1 of each radio frame. Y1 may be
equal to one or more of 0, 4, 5 and 9. The PBCH may be transmitted
for four times within each period by taking 24 radio frames as a
period.
Sixth Embodiment
[0301] The system message may include available resource
information of the physical downlink channel, radio frame
information, frequency domain location information of a system,
configuration information of a physical shared channel carrying a
system message, and configuration information of terminal
access.
[0302] The radio frame information, the NB-LTE frequency domain
location information and the configuration information of the
physical shared channel carrying the system message may be carried
by a PBCH.
[0303] The synchronization channel may be located on a subframe #8
of a radio frame, and the PBCH may be located on a subframe #9 of
the radio frame. Alternatively, the synchronization channel may be
located on a subframe #6 of a radio frame, and the PBCH may be
located on a subframe #5 of the radio frame. Alternatively, the
synchronization channel may be located on a subframe #3 of a radio
frame, and the PBCH may be located on a subframe #4 of the radio
frame. Alternatively, the synchronization channel may be located on
a subframe #1 of a radio frame, and the PBCH may be located on a
subframe #0 of the radio frame.
[0304] The PBCH may be located on last Y OFDM symbols of a first
slot of a subframe and first X OFDM symbols of a second slot of the
subframe, wherein X may be equal to 4, 5, 6 or 7, and Y may be
equal to 0, 1, 2, 3, 4 or 5.
[0305] The PBCH may be transmitted at an interval of Z1 radio
frames, and may be repeatedly transmitted for Z2 times by every
Z1*Z2 radio frames. Z1 may be equal to 6, 8, 12 or 24, and Z2 may
be equal to 4, 6, 8, 12 or 16.
[0306] For example, the symbol may include first four or five OFDM
symbols of a second slot of a subframe, or, the last OFDM symbol of
a first slot of a subframe and first four OFDM symbols of a second
slot of the subframe, or, last two OFDM symbols of a first slot of
a subframe and first four OFDM symbols of a second slot of the
subframe, or, last two OFDM symbols of a first slot of a subframe
and first six OFDM symbols of a second slot of the subframe, or,
last three OFDM symbols of a first slot of a subframe and first
five OFDM symbols of a second slot of the subframe, or, last five
OFDM symbols of a first slot of a subframe and first seven OFDM
symbols of a second slot of the subframe, or, last three OFDM
symbols of a first slot of a subframe and all OFDM symbols of a
second slot of the subframe.
[0307] The mapping method may reduce the number of subframes for
mapping a PBCH and reduce the transmission delay. Different CP
types may adopt a unified design solution to the greatest
extent.
[0308] The PBCH may be mapped to six successive radio frames, and
may be located on a fixed subframe #Y1 of each radio frame. Y1 may
be equal to one or more of 0, 4, 5 and 9. The PBCH may be
transmitted for four times within each period by taking 24 radio
frames as a period.
[0309] Alternatively, the PBCH may be mapped to first three
successive radio frames of every six radio frames, and may be
located on a fixed subframe #Y1 of each radio frame. Y1 may be
equal to one or more of 0, 4, 5 and 9. The PBCH may be transmitted
for four times within each period by taking 24 radio frames as a
period.
[0310] The available resource information of the physical downlink
channel and the configuration information of terminal access may be
carried by a PBCH. A start OFDM symbol of a physical shared channel
carrying the system message in a subframe may be a first OFDM
symbol, and corresponding available resource elements may be
remaining resources after removing a 4-port virtual cell CRS port.
The physical downlink shared channel may be transmitted in a
single-port manner.
[0311] Signaling is defined respectively for the information of the
start OFDM symbol of the physical downlink channel in a subframe
and information of one or more available resource elements of the
physical downlink channel in a subframe.
[0312] The information of the start OFDM symbol of the physical
downlink channel in a subframe may occupy 1 bit, indicating a first
OFDM symbol, or a k.sup.th OFDM symbol, where k may be equal to 3,
4 or 5. Alternatively, the information of the start OFDM symbol of
the physical downlink channel in a subframe may occupy 2 bits,
indicating the first, second, third or fourth OFDM symbol.
[0313] The information of one or more available resource elements
of the physical downlink channel in a subframe may be indicated via
a CRS port location and/or a CSI-RS port location.
[0314] Herein, the CRS port location may be 1, 2 or 4, or, the CRS
port location may be 1 or 4. The CSI-RS port location may include
Null, or may be one or more selected CSI-RS resource configuration
indexes in a relevant LTE system.
[0315] The physical shared channel carrying the system message, the
synchronization channel and the PBCH may be located on different
subframes.
[0316] The one or more subframes of the physical shared channel
carrying the system message may include one or more of a subframe
#0, a subframe #4, a subframe #5 and a subframe #9.
[0317] The physical downlink channel may include a physical
downlink shared channel and/or a physical downlink control
channel.
[0318] Another embodiment of the disclosure provides a computer
storage medium in which a computer-executable instruction is
stored. The computer-executable instruction is used to execute the
method in the above-mentioned embodiments.
[0319] Those of ordinary skill in the art may understand that all
or some of the steps in the above-mentioned method may be completed
by instructing relevant hardware (e.g., processor) through a
program. The program may be stored in a computer-readable storage
medium such as a read-only memory, a magnetic disk or an optical
disk. Alternatively, all or some of the steps in the
above-mentioned embodiments may be implemented by using one or more
integrated circuits. Accordingly, each module/unit in the
above-mentioned embodiments may be implemented in a form of
hardware, and for example, corresponding functions thereof are
implemented by means of an integrated circuit. Each module/unit may
also be implemented in a form of software function module, and for
example, corresponding functions thereof are implemented by
executing programs/instructions stored in a memory by the
processor. The disclosure is not limited to the combination of
hardware and software in any specific form.
[0320] Although the disclosure provides the implementation manners
as above, the content is only the implementation manners
illustrated for convenience of understanding the disclosure, and is
not intended to limit the disclosure. Any person skilled in the art
may make any modifications and changes about an implementation form
and details without departing from the scope disclosed in the
disclosure. However, the scope of protection limited by the
disclosure should be determined with reference to the scope defined
by the appended claims.
INDUSTRIAL APPLICABILITY
[0321] The above-mentioned technical solutions can reduce the
interference between signals during spectrum sharing between
different systems and reduce the occurrence of simultaneous
transmission of different signals over the same resource by
different systems, thereby ensuring consistency between a system
and a terminal, and improving the data transmission
performance.
* * * * *