U.S. patent application number 15/247624 was filed with the patent office on 2016-12-15 for communication method and apparatus for carrier aggregation system.
The applicant listed for this patent is Huawei Technologies Co., Ltd.. Invention is credited to Lei GUAN, Bo LI, Yongxia LV.
Application Number | 20160365961 15/247624 |
Document ID | / |
Family ID | 46693579 |
Filed Date | 2016-12-15 |
United States Patent
Application |
20160365961 |
Kind Code |
A1 |
LI; Bo ; et al. |
December 15, 2016 |
COMMUNICATION METHOD AND APPARATUS FOR CARRIER AGGREGATION
SYSTEM
Abstract
Embodiments of the present invention provide a communication
method for a carrier aggregation system. The communication method
includes receiving physical downlink share channel PDSCH
information sent by a base station through a subframe n of a
secondary cell. If a subframe n of a primary cell is a downlink
subframe, an ACK/NACK of the sent PDSCH information is fed back on
a subframe m or a subframe p of the primary cell.
Inventors: |
LI; Bo; (Beijing, CN)
; GUAN; Lei; (Beijing, CN) ; LV; Yongxia;
(Beijing, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Huawei Technologies Co., Ltd. |
Shenzhen |
|
CN |
|
|
Family ID: |
46693579 |
Appl. No.: |
15/247624 |
Filed: |
August 25, 2016 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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14951101 |
Nov 24, 2015 |
9456443 |
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15247624 |
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13975212 |
Aug 23, 2013 |
9232506 |
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14951101 |
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PCT/CN2012/071592 |
Feb 24, 2012 |
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13975212 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 72/1289 20130101;
H04L 1/1854 20130101; H04W 72/0406 20130101; H04L 1/1887 20130101;
H04W 72/0446 20130101; H04W 72/042 20130101; H04L 5/14 20130101;
H04L 5/0055 20130101 |
International
Class: |
H04L 5/00 20060101
H04L005/00; H04W 72/04 20060101 H04W072/04 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 24, 2011 |
CN |
201110045513.0 |
Jan 21, 2012 |
CN |
201210019206.X |
Claims
1. A communication method for a carrier aggregation system, the
method comprising: receiving, by a user equipment (UE), downlink
information from a base station through a subframe n of a secondary
cell; and feeding back, by the UE, an ACK/NACK of the downlink
information on a subframe m of a primary cell; wherein n and m are
subframe indexes; wherein a subframe n of the primary cell
comprises a downlink subframe; wherein an index value of the
subframe m of the primary cell is equal to an index value of an
uplink subframe which is determined according to an ACK/NACK timing
relationship to which the subframe n of the primary cell
corresponds; and wherein the primary cell and the secondary cell
have different UL-DL configurations.
2. The communication method according to claim 1, wherein the
downlink information is physical downlink shared channel (PDSCH)
information.
3. The communication method according to claim 2, further
comprising: receiving, by the UE, physical downlink control channel
(PDCCH) information sent by the base station through the subframe n
of the primary cell, wherein the PDCCH information is used to
schedule the PDSCH information.
4. The communication method according to claim 1, wherein when the
primary cell is in UL-DL configuration 2, the ACK/NACK timing
relationship comprises an uplink subframe 2 being used to feed back
an uplink ACK/NACK of downlink subframes 4, 5, 6 and 8.
5. The communication method according to claim 1, wherein when the
primary cell is in UL-DL configuration 2, the ACK/NACK timing
relationship comprises an uplink subframe 7 being used to feed back
an uplink ACK/NACK of downlink subframes 0, 1, 3 and 9.
6. The communication method according to claim 5, wherein when the
primary cell is in UL-DL configuration 2, the ACK/NACK timing
relationship comprises an uplink subframe 2 being used to feed back
an uplink ACK/NACK of downlink subframes 4, 5, 6 and 8.
7. A user equipment, comprising: a receiver, configured to receive
downlink information sent by a base station through a subframe n of
a secondary cell; and a processor, configured to feed back an
ACK/NACK of the downlink information on a subframe m of a primary
cell; wherein n and m are subframe indexes; wherein a subframe n of
the primary cell comprises a downlink subframe; wherein an index
value of the subframe m of the primary cell is equal to an index
value of an uplink subframe which is determined according to an
ACK/NACK timing relationship to which the subframe n of the primary
cell corresponds; and wherein the primary cell and the secondary
cell have different UL-DL configurations.
8. The user equipment according to claim 7, wherein the downlink
information is physical downlink shared channel (PDSCH)
information.
9. The user equipment according to claim 8, wherein the receiver is
further configured to receive physical downlink control channel
(PDCCH) information sent by the base station through the subframe n
of the primary cell, wherein the PDCCH information is used to
schedule the PDSCH information.
10. The user equipment according to claim 7, wherein when the
primary cell is in UL-DL configuration 2, the ACK/NACK timing
relationship comprises an uplink subframe 2 being used to feed back
an uplink ACK/NACK of downlink subframes 4, 5, 6 and 8.
11. The user equipment according to claim 7, wherein when the
primary cell is in UL-DL configuration 2, the ACK/NACK timing
relationship comprises an uplink subframe 7 being used to feed back
an uplink ACK/NACK of downlink subframes 0, 1, 3 and 9.
12. The user equipment according to claim 11, wherein when the
primary cell is in UL-DL configuration 2, the ACK/NACK timing
relationship comprises an uplink subframe 2 being used to feed back
an uplink ACK/NACK of downlink subframes 4, 5, 6 and 8.
13. A user equipment, comprising: a receiver, configured to receive
downlink information sent by a base station through a subframe n of
a secondary cell; and a processor, configured to feed back an
ACK/NACK of the downlink information on a preset uplink subframe of
a primary cell; wherein a subframe n of the primary cell is an
uplink subframe; wherein a subframe p of the primary cell is a
downlink subframe; wherein n and p are subframe indexes; wherein
the index value of the subframe p of the primary cell is equal to
an index value of of an uplink subframe which is determined
according to an ACK/NACK timing relationship to which the subframe
n of the secondary cell corresponds; and wherein the primary cell
and the secondary cell have different UL-DL configurations.
14. The user equipment according to claim 13, wherein the downlink
information is physical downlink shared channel (PDSCH)
information.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 14/951,101, filed on Nov. 24, 2015. U.S.
patent application Ser. No. 14/951,101 is a continuation of U.S.
patent application Ser. No. 13/975,212, filed on Aug. 23, 2013, now
U.S. Pat. No. 9,232,506, which is a continuation of International
Application No. PCT/CN2012/071592, filed on Feb. 24, 2012. The
International Application claims priority to Chinese Patent
Application No. 201110045513.0, filed on Feb. 24, 2011, and Chinese
Patent Application No. 201210019206.X, filed on Jan. 21, 2012. The
afore-mentioned patent applications are hereby incorporated by
reference in their entireties.
[0002] This application is also related to U.S. patent application
Ser. No. 14/951,138, filed on Nov. 24, 2015, which is hereby
incorporated by reference in its entirety.
TECHNICAL FIELD
[0003] The present invention relates to the field of communication
technologies, and in particular, to a communication method and an
apparatus for a carrier aggregation system.
BACKGROUND
[0004] For a long term evolution LTE (Long Term Evolution) version
8 (Release 8, R8) system, a base station and a user equipment (UE)
communicate and transmit data on a carrier. The base station
schedules the UE by a physical downlink control channel PDCCH
(Physical Downlink Control Channel). The PDCCH may be downlink
scheduling grant (DL_grant) or uplink scheduling grant (UL_grant)
information, respectively carrying time frequency resource
distribution scheduling information and the like for indicating a
physical downlink share channel PDSCH (Physical Downlink Shared
Channel) or a physical uplink share channel PUSCH (Physical Uplink
Shared Channel). The UE, after receiving and decoding the PDCCH,
according to the carried scheduling information, receives downlink
data PDSCH or sends uplink data PUSCH, and thereafter, the UE feeds
back uplink ACK/NACK (AN) for the downlink data, where feeding back
ACK indicates determining receiving or receiving success and
feeding back NACK indicates that no determining receiving or
receiving failure. The base station, after receiving the uplink
data, feeds back downlink AN. PDCCH and its scheduled PDSCH or
PUSCH, and PDSCH and its corresponding uplink AN have a certain
timing relationship, that is, or sequential relationship.
[0005] To increase a peak rate and meet the requirement of the
future communication system for a data rate, an enhanced long term
evolution LTE-A (Long Term Evolution Advanced) system introduces
the carrier aggregation CA (Carrier Aggregation) technology, that
is, allocating member carriers (Component Carrier, CC) to one UE
for supporting a higher rate of data transmission. For example, an
LTE version 10 (Release 10, R10) system configures a plurality of
carriers for a UE, including a pair of uplink and downlink primary
carriers (Primary CC, PCC) and the remaining carriers are secondary
carriers (Secondary CC or SCC), where a PCC is also called a
primary cell (PCell) and an SCC is also called a secondary cell
(SCell), and an uplink AN of the UE can only be sent in an uplink
PCell. Additionally, in a carrier aggregation scenario, an LTE R10
system supports cross-carrier scheduling, that is, sending the
PDCCH of a plurality of carriers for scheduling a UE to a certain
or several carriers, such as a PCell.
[0006] In a TDD CA system where a plurality of carriers has
different UL-DL configurations, because the UL-DL configuration of
a PCell and that of an SCell are different, according to the SCell
timing relationship, communication between the base station and the
UE through the SCell may be not normally performed.
SUMMARY OF THE INVENTION
[0007] Embodiments of the present invention are mainly for
providing a communication method and an apparatus for a CA system
to effectively ensure normal communication between the base station
and the UE.
[0008] In one aspect, an embodiment of the present invention
provides a communication method for a CA system. If a subframe n of
a primary cell is a downlink subframe, an ACK/NACK of the sent
PDSCH information is fed back on a subframe m or a subframe p of
the primary cell. The m, determined according to the ACK/NACK
timing relationship to which the subframe n of the primary cell
corresponds, is a subframe index of a subframe that feeds back the
ACK/NACK of the PDSCH of the subframe n of the primary cell in the
primary cell and the p, determined according to the ACK/NACK timing
relationship to which the subframe n of the secondary cell
corresponds, is a subframe index of a subframe that feeds back the
ACK/NACK of the PDSCH of the subframe n of the secondary cell in
the secondary cell. In this case, n, m, and p are subframe
indexes.
[0009] In one aspect, an embodiment of the present invention
provides a communication method for a CA system. Physical downlink
share channel PDSCH information sent by a base station through a
subframe n of a secondary cell is received. When the subframe n is
an uplink subframe in a primary cell, if a subframe p is an uplink
subframe in a primary cell, an ACK/NACK of the sent PDSCH
information is fed back on the subframe p of the primary cell.
Alternatively, if the subframe p in a primary cell is a downlink
subframe, according to presetting or a notification of the base
station, an ACK/NACK of the sent PDSCH information is fed back on a
subframe in a primary cell and specificed by the presetting or on
the notification of the base station. The p, determined according
to the ACK/NACK timing relationship to which the subframe n of the
secondary cell corresponds, is a subframe index of a subframe that
feeds back the ACK/NACK of the PDSCH of the subframe n of the
secondary cell in a secondary cell, and n and p are subframe
indexes.
[0010] In one aspect, an embodiment of the present invention
provides a communication method for a CA system. Physical downlink
share channel (PDSCH) information sent by a base station through a
subframe n of a secondary cell is received. When the subframe n is
an uplink subframe in a primary cell, if a subframe p is an uplink
subframe in a primary cell, an ACK/NACK of the sent PDSCH
information is fed back on the subframe p of the primary cell.
Alternatively, if the subframe p in a primary cell is a downlink
subframe, according to a presetting or a notification of the base
station, an ACK/NACK of the sent PDSCH information is fed back on
an uplink subframe in a primary cell and specificed by the
presetting or the notification of the base station. The p,
determined according to the ACK/NACK timing relationship to which
the subframe n of the secondary cell corresponds, is a subframe
index of a subframe that feeds back the ACK/NACK of the PDSCH of
the subframe n of the secondary cell in a secondary cell, and n and
p are subframe indexes.
[0011] In one aspect, an embodiment of the present invention
provides a communication method for a CA system. Physical downlink
share channel (PDSCH) information is sent to a user equipment
through a subframe n of a secondary cell. When the subframe n is an
uplink subframe in a primary cell, if a subframe p is an uplink
subframe in a primary cell, an ACK/NACK of the PDSCH information
sent by the user equipment on the subframe p in a primary cell is
received. Alternatively, if the subframe p in a primary cell is a
downlink subframe, an ACK/NACK of the PDSCH information that is
sent, according to a presetting or a notification of the base
station, by a user equipment on an uplink subframe in a primary
cell is received. The ACK/NACK is specificed by the presetting or
the notification of the base station. The p, determined according
to the ACK/NACK timing relationship to which the subframe n of the
secondary cell corresponds, is a subframe index of a subframe that
feeds back the ACK/NACK of the PDSCH of the subframe n of the
secondary cell in a secondary cell, and n and p are subframe
indexes.
[0012] After adopting foregoing technical solutions, the
communication method provided by the embodiment of the present
invention for a CA system, in the CA system where each carrier has
a distinct UL-DL configuration, can effectively ensure that an
uplink AN to which an SCell corresponds is normally fed back and
further that normal communication between the base station and the
UE.
[0013] In another aspect, an embodiment of the present invention
further provides a communication method for a CA system. Scheduling
information UL_grant for scheduling PUSCH of an uplink subframe n
of a secondary cell of a user equipment is generated. If a subframe
n of a primary cell is an uplink subframe, the scheduling
information UL_grant of the PUSCH is sent to the user equipment
through a subframe q or a subframe y of the primary cell. The q,
determined according to the UL_grant timing relationship to which
the subframe n of the primary cell corresponds, is a subframe index
of a subframe that sends the scheduling information UL_grant of the
PUSCH of the subframe n of the primary cell, and the y, determined
according to the UL_grant timing relationship to which the subframe
n of the secondary cell corresponds, is a subframe index of a
subframe that sends the scheduling information UL_grant of the
PUSCH of the subframe n of the secondary cell. Alternatively, when
the subframe n of the primary cell is a downlink subframe, if the
subframe y of the primary cell is a downlink subframe, the
scheduling information UL_grant of the PUSCH is sent to the user
equipment through the subframe y of the primary cell.
Alternatively, if the subframe y of the primary cell is an uplink
subframe, according to presetting or locally acquired information,
the scheduling information UL_grant of the PUSCH is sent to the
user equipment through a downlink subframe in a primary cell and
specified by the presetting or the locally acquired information.
The y, determined according to the UL_grant timing relationship to
which the subframe n of the secondary cell corresponds, is a
subframe index of a subframe that sends the scheduling information
UL_grant of the PUSCH of the subframe n of the secondary cell, and,
n, q, and y are subframe indexes.
[0014] In another aspect, an embodiment of the present invention
further provides a communication method for a CA system, including,
if a subframe n of a primary cell is an uplink subframe receiving
the scheduling information UL_grant of the PUSCH information of the
subframe n of the secondary cell, sent by a base station on a
subframe q or a subframe y of the primary cell, where the q,
determined according to the UL_grant timing relationship to which
the subframe n of the primary cell corresponds, is a subframe index
of a subframe that sends the scheduling information UL_grant of the
PUSCH of the subframe n of the primary cell, and the y, determined
according to the UL_grant timing relationship to which the subframe
n of the secondary cell corresponds, is a subframe index of a
subframe that sends the scheduling information UL_grant of the
PUSCH of the subframe n of the secondary cell, or, when the
subframe n of the primary cell is a downlink subframe, if the
subframe y of the primary cell is a downlink subframe, receiving
the scheduling information UL_grant of the PUSCH information of the
subframe n of the secondary cell, sent by the base station on the
subframe y of the primary cell; or, if the subframe y of the
primary cell is an uplink subframe, according to a presetting or a
notification of a base station, receiving the scheduling
information UL_grant of the PUSCH of the subframe n of the
secondary cell, sent by the base station on a downlink subframe in
a primary cell and specified by the presetting or the notification
of the base station; where, the y, determined according to the
UL_grant timing relationship to which the subframe n of the
secondary cell corresponds, is a subframe index of a subframe that
sends the scheduling information UL_grant of the PUSCH of the
subframe n of the secondary cell; where, n, q, and y are subframe
indexes, and according to the scheduling information UL_grant of
the PUSCH, sending the PUSCH on the subframe n of the secondary
cell.
[0015] After adopting foregoing technical solutions, the
communication method provided by the embodiment of the present
invention for a CA system, in the CA system where each carrier has
a distinct UL-DL configuration, can effectively ensure that the
PUSCH of an SCell is normally scheduled and effectively ensure
normal communication between the base station and the UE.
[0016] In yet another aspect, an embodiment of the present
invention provides a UE for a CA system, including a receiving
unit, configured to receive PDSCH information sent by a base
station through a subframe n of an SCell, and a feedback unit,
configured to, if the subframe n of a PCell is a downlink subframe,
feed back an AN of the sent PDSCH information on a subframe m or a
subframe p of the PCell, where the m, determined according to the
AN timing relationship to which the subframe n of the PCell
corresponds, is a subframe index of a subframe that feeds back the
AN of the PDSCH of the subframe n of the PCell in a PCell, and the
p, determined according to the AN timing relationship to which the
subframe n of the SCell corresponds, is a subframe index of a
subframe that feeds back the AN of the PDSCH of the subframe n of
the SCell in a SCell, or if the subframe n of the PCell is an
uplink subframe, if a subframe p of the PCell is an uplink
subframe, feed back an AN of the sent PDSCH information on the
subframe p of the PCell; or, if the subframe p of the PCell is a
downlink subframe, according to a presetting or a notification of a
base station, feed back an AN of the sent PDSCH information on an
uplink subframe in a PCell and specified by the presetting or the
notification of the base station, where, n, m, and p are subframe
indexes.
[0017] In yet another aspect, an embodiment of the present
invention provides a base station for a CA system, including a
sending unit, configured to send PDSCH information to a UE through
a subframe n of an SCell, and a receiving unit, configured to, if a
subframe n of a PCell is a downlink subframe, receive an AN of the
sent PDSCH information sent by a UE on a subframe m or a subframe p
of the PCell, where the m, determined according to the AN timing
relationship to which the subframe n of the PCell corresponds, is a
subframe index of a subframe that feeds back the AN of the PDSCH of
the subframe n of the PCell in a PCell, and the p, determined
according to the AN timing relationship to which the subframe n of
the SCell corresponds, is a subframe index of a subframe that feeds
back the AN of the PDSCH of the subframe n of the SCell in a SCell,
or if the subframe n of the PCell is an uplink subframe, if a
subframe p of the PCell is an uplink subframe, receive an AN of the
sent PDSCH information sent by a UE on the subframe p of the PCell;
or, if the subframe p of the PCell is a downlink subframe, receive,
according to a presetting or a notification of a base station, an
AN of the sent PDSCH information sent by the UE on an uplink
subframe in a PCell and specified by the presetting or the
notification of the base station, where, n, m, and p are subframe
indexes.
[0018] In yet another aspect, an embodiment of the present
invention provides a method for a CA system, including, receiving
physical downlink share channel (PDSCH) information sent by a base
station through a subframe n of a secondary cell, and on a subframe
k of a primary cell, feeding back an ACK/NACK of the sent PDSCH
information, where the k, determined according to the ACK/NACK
timing relationship of a first reference TDD UL-DL configuration,
is a subframe index of a subframe that feeds back the ACK/NACK of
the subframe n of the secondary cell in a primary cell.
[0019] In yet another aspect, an embodiment of the present
invention provides a method for a CA system, including sending
physical downlink share channel (PDSCH) information to a user
equipment through a subframe n of a secondary cell, and on a
subframe k of a primary cell, receiving an ACK/NACK of the sent
PDSCH information fed back by the user equipment, where the k,
determined by the user equipment according to the ACK/NACK timing
relationship of a first reference TDD UL-DL configuration, is a
subframe index of a subframe that feeds back the ACK/NACK of the
subframe n of the secondary cell in a primary cell.
[0020] In yet another aspect, an embodiment of the present
invention provides a user equipment for a CA system, including a
receiving unit, configured to receive physical downlink share
channel (PDSCH) information sent by a base station through a
subframe n of a secondary cell, a processing unit, configured to
determine, according to the ACK/NACK timing relationship of a first
reference TDD UL-DL configuration, a subframe index k of subframe
in a primary cell that feeds back the ACK/NACK to which the
subframe n of the secondary cell corresponds, and a sending unit,
configured to feed back the ACK/NACK of the PDSCH information
received by the receiving unit on the subframe k determined by the
processing unit in a primary cell.
[0021] In yet another aspect, an embodiment of the present
invention provides a base station for a CA system, including a
sending unit, configured to send physical downlink share channel
(PDSCH) information to a user equipment through a subframe n of a
secondary cell, and a receiving unit, configured to receive, on a
subframe k of a primary cell, an ACK/NACK of the PDSCH information
received by the receiving unit and fed back by the user equipment,
where the k, determined by the user equipment according to the
ACK/NACK timing relationship of a first reference TDD UL-DL
configuration, is a subframe index of a subframe that feeds back
the ACK/NACK of the subframe n of the secondary cell in a primary
cell.
[0022] After adopting foregoing technical solutions, the UE and the
base station provided by the embodiments of the present invention
for a CA system, in the CA system where each carrier has a distinct
UL-DL configuration, can effectively ensure that an uplink AN to
which an SCell corresponds is normally fed back and further
effectively ensure normal communication between a UE and a base
station.
[0023] In still another aspect, an embodiment of the present
invention provides a base station for a CA system, including a
generation unit, configured to generate scheduling information
UL_grant for scheduling PUSCH of an uplink subframe n of an SCell,
and a scheduling unit, configured to if the subframe n of a PCell
is an uplink subframe send the scheduling information UL_grant of
the PUSCH of a UE through a subframe q or a subframe y of the
PCell, where the q, according to the UL_grant timing relationship
to which the subframe n of the PCell corresponds, is a subframe
index of a subframe that sends the scheduling information UL_grant
of the PUSCH of the subframe n of the PCell, and the y, according
to the UL_grant timing relationship to which the subframe n of the
SCell corresponds, is a subframe index of a subframe that sends the
scheduling information UL_grant of the PUSCH of the subframe n of
the SCell, or if the subframe n of the PCell is a downlink
subframe, if the subframe y of the PCell is a downlink subframe,
send the scheduling information UL_grant of the PUSCH to the UE
through the subframe y of the PCell, and if the subframe y of the
PCell is an uplink subframe, according to presetting or locally
acquired information, send the scheduling information UL_grant of
the PUSCH to the UE through a downlink subframe in a PCell and
specified by the presetting or the locally acquired information,
where, n, q, and y are subframe indexes.
[0024] In still another aspect, an embodiment of the present
invention provides a UE for a CA system, including a receiving
unit, configured to, if the subframe n of a PCell is an uplink
subframe, receive the scheduling information UL_grant of the PUSCH
information of the subframe n of the SCell, sent on a subframe q or
a subframe y of the PCell by a base station, where the q, according
to the UL_grant timing relationship to which the subframe n of the
PCell corresponds, is a subframe index of a subframe that sends the
scheduling information UL_grant of the PUSCH of the subframe n of
the PCell, and the y, according to the UL_grant timing relationship
to which the subframe n of the SCell corresponds, is a subframe
index of a subframe that sends the scheduling information UL_grant
of the PUSCH of the subframe n of the SCell, or if the subframe n
of the PCell is a downlink subframe, if a subframe y of the PCell
is a downlink subframe, receive the scheduling information UL_grant
of the PUSCH information of the subframe n of the SCell, sent on
the subframe y of the PCell by a base station; and if the subframe
y of the PCell is an uplink subframe, according to a presetting or
a notification of the base station, receive, by the base station,
the scheduling information UL_grant of the PUSCH on a downlink
subframe in the SCell and specified by the presetting or the
notification of the base station where, n, q, and y are subframe
indexes, and a sending unit, configured to send, according to the
scheduling information UL_grant of the PUSCH, the PUSCH on the
subframe n of the SCell.
[0025] After adopting foregoing technical solutions, the base
station and the UE provided by the embodiment of the present
invention for a CA system, in the CA system where each carrier has
a distinct UL-DL configuration, can effectively ensure that the
PUSCH of an SCell is normally scheduled and effectively ensure
normal communication between the base station and the UE.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] To illustrate the technical solutions in the embodiments of
the present invention or in the prior art more clearly, the
following briefly introduces the accompanying drawings required for
describing the embodiments or the prior art. Apparently, the
accompanying drawings in the following description show merely some
embodiments of the present invention, and persons of ordinary skill
in the art may still derive other drawings from these accompanying
drawings without creative efforts.
[0027] FIG. 1 is a flowchart of a communication method of an
embodiment of the present invention;
[0028] FIG. 2 is another flowchart of a communication method of an
embodiment of the present invention;
[0029] FIG. 3 is a schematic diagram of an UL-DL configuration of a
CA system of an embodiment of the present invention;
[0030] FIG. 4 is another flowchart of a communication method of an
embodiment of the present invention;
[0031] FIG. 5 is another flowchart of a communication method of an
embodiment of the present invention;
[0032] FIG. 6 is a schematic diagram of an UL-DL configuration of a
CA system of an embodiment of the present invention;
[0033] FIG. 7 is a schematic diagram of an UL-DL configuration of a
CA system of an embodiment of the present invention;
[0034] FIG. 8 is a structural diagram of a UE of an embodiment of
the present invention.
[0035] FIG. 9 is another structural diagram of a UE of an
embodiment of the present invention.
[0036] FIG. 10 is a structural diagram of a base station of an
embodiment of the present invention;
[0037] FIG. 11 is another structural diagram of a base station of
an embodiment of the present invention;
[0038] FIG. 12 is a structural diagram of a base station of an
embodiment of the present invention;
[0039] FIG. 13 is a structural diagram of a UE of an embodiment of
the present invention.
[0040] FIG. 14 is another flowchart of a communication method of an
embodiment of the present invention;
[0041] FIG. 15 is a schematic diagram of an UL-DL configuration of
a CA system of an embodiment of the present invention;
[0042] FIG. 16 is a schematic diagram of an UL-DL configuration of
a CA system of an embodiment of the present invention;
[0043] FIG. 17 is a schematic diagram of an UL-DL configuration of
a CA system of an embodiment of the present invention;
[0044] FIG. 18 is another structural diagram of a UE of an
embodiment of the present invention.
[0045] FIG. 19 is another flowchart of a communication method of an
embodiment of the present invention;
[0046] FIG. 20 is another structural diagram of a base station of
an embodiment of the present invention;
[0047] FIG. 21 is another flowchart of a communication method of an
embodiment of the present invention;
[0048] FIG. 22 is a schematic diagram of an UL-DL configuration of
a CA system of an embodiment of the present invention;
[0049] FIG. 23 is a schematic diagram of an UL-DL configuration of
a CA system of an embodiment of the present invention;
[0050] FIG. 24 is a schematic diagram of an UL-DL configuration of
a CA system of an embodiment of the present invention; and
[0051] FIG. 25 is a schematic diagram of an UL-DL configuration of
a CA system of an embodiment of the present invention.
DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
[0052] The technical solutions in the embodiments of the present
invention are clearly and completely described in the following
with reference to the accompanying drawings in the embodiments of
the present invention.
[0053] It should be definite that, the described embodiments are
only a part of the embodiments of the present invention rather than
all the embodiments. All other embodiments obtained by persons of
ordinary skill in the art based on the embodiments of the present
invention without creative efforts shall fall within the protection
scope of the present invention.
[0054] It should be noted that, the embodiments of the present
invention are applied to a time division duplexing TDD (Time
Division Duplexing) system or a carrier aggregation system of the
TDD and the frequency division duplexing FDD (Frequency Division
Duplexing), and the like. Additionally, in the embodiments of the
present invention, a cell (Cell) may also be replaced with the
concept of a member carrier. In this way, a PCell is also called a
PCC and an SCell also called an SCC.
[0055] To make persons skilled in the art better understand the
technical solutions of the present invention, firstly the UL-DL
configuration and the timing relationship in an LTE TDD system are
briefly introduced.
[0056] A detailed UL-DL configuration of an LTE TDD system is
listed in Table 1. The LTE TDD system may support seven different
types of UL-DL subframe configurations from configuration 0 to
configuration 6. In different UL-DL configurations, one wireless
frame includes 10 subframe indexes or subframe numbers from 0 to 9.
Subframes of the same subframe index may have a same or different
subframe type. In Table 1, D indicates a downlink subframe, S
indicates a special subframe that may transmit downlink data, and U
indicates an uplink subframe.
TABLE-US-00001 TABLE 1 UL-DL CONFIGURATION OF AN LTE TDD SYSTEM
UL-DL configu- Subframe Index (Subframe Number) ration 0 1 2 3 4 5
6 7 8 9 0 D S U U U D S U U U 1 D S U U D D S U U D 2 D S U D D D S
U D D 3 D S U U U D D D D D 4 D S U U D D D D D D 5 D S U D D D D D
D D 6 D S U U U D S U U D
[0057] Specifically, a timing relationship between PDSCH and its
corresponding uplink AN is listed in Table 2. A subframe marked
with a number in Table 2 is an uplink subframe, where the number
indicates the uplink AN of PDSCH of which downlink subframe needs
to be fed back by the uplink subframe. For example in configuration
1, numbers 5 and 6 in a subframe 2 indicates that the uplink
subframe 2 is used to feed back the uplink AN of downlink subframes
5 and 6.
TABLE-US-00002 TABLE 2 TIMING RELATIONSHIP BETWEEN PDSCH AND ITS
CORRESPONDING UPLINK AN UL-DL Configu- Subframe Index (Subframe
Number) ration 0 1 2 3 4 5 6 7 8 9 0 6 0 1 5 1 5.6 9 0.1 4 2
4.5.6.8 0.1.3.9 3 1.5.6 7.8 0.9 4 0.1.4.5 6.7.8.9 5
0.1.3.4.5.6.7.8.9 6 5 6 9 0 1
[0058] Specifically, a timing relationship between UL_grant and
PUSCH scheduled by it is listed in Table 3. A subframe marked with
a number in Table 3 is an uplink subframe, where the number
indicates on which one downlink subframe the UL_grant for
scheduling PUSCH of the current uplink subframe is sent. For
example in configuration 1, PUSCH of an uplink subframe 2 is
scheduled by UL_grant sent to a downlink subframe 6, and in
configuration 0, PUSCH of an uplink subframe 2 may be scheduled by
the UL_grant sent to downlink subframes 5 and 6.
TABLE-US-00003 TABLE 3 Timing relationship between UL_grant and
PUSCH that scheduled by UL_grant. UL-DL Configu- Subframe Index
(Subframe Number) ration 0 1 2 3 4 5 6 7 8 9 0 5.6 6 0 0.1 1 5 1 6
9 1 4 2 8 3 3 8 9 0 4 8 9 5 8 6 5 6 9 0 1
[0059] In a CA system where a plurality of carriers has different
UL-DL configurations, when an uplink AN of a UE can only be set to
an uplink PCell, according to the uplink AN timing relationship of
an SCell, the AN to which the SCell corresponds may be not fed
back, affecting normal communication between a base station and the
UE. For example, in a TDD CA system that includes two carriers: a
PCell and an SCell, the PCell is an UL-DL configuration 2, and the
SCell is an UL-DL configuration 1. As listed in Table 2, according
to a timing relationship between PDSCH of the SCell and its
corresponding uplink AN, the ANs to which the two downlink
subframes 4 and 9 of the SCell correspond are respectively fed back
on subframes 3 and 8, that is, fed back on the subframes 3 and 8 of
the PCell. However, at this moment, the ANs to which the two
downlink subframes 4 and 9 of the SCell fails to be fed back on the
subframes 3 and 8 of the PCell according to the original time
sequence, because subframes 3 and 8 of the PCell are downlink
subframes.
[0060] In the similar way, in a TDD CA system where a plurality of
carriers has different UL-DL configurations, in a cross-carrier
scheduling scenario, PDCCH of each carrier is sent to the PCell,
according to a timing relationship from the UL_grant of the SCell
to PUSCH, PUSCH of the SCell may not be scheduled, affecting normal
communication between a base station and a UE. For example, in a
TDD CA system that includes two carriers: a PCell and an SCell, the
PCell is an UL-DL configuration 1, and the SCell is an UL-DL
configuration 2. In a cross-carrier scheduling scenario, PDCCH of
each carrier is sent to the PCell. As listed in Table 3, according
to a timing relationship between the UL_grant of the SCell and the
PUSCH scheduled by the SCell, the UL_grant for scheduling PUSCH of
the uplink subframe 2 is on the downlink subframe 8, that is,
scheduling is performed on the subframe 8 of a PCell, but at this
moment scheduling fails to be performed in a PCell, because the
subframe 8 of the PCell is an uplink subframe.
[0061] Based on the above, the embodiments of the present invention
provide a communication method and an apparatus for a CA system to
effectively ensure normal communication between the base station
and the UE.
[0062] As shown in FIG. 1, an embodiment of the present invention
provides a communication method for a CA system, based on a UE. In
the embodiment, the CA system is configured with a PCell and an
SCell, where the PCell and the SCell have different UL-DL
configurations, and the embodiment includes the following
steps.
[0063] Step 101: Receive the PDSCH information sent by a base
station through a subframe n of an SCell.
[0064] Here, n is a subframe index. Apparently, the subframe n of
the SCell is a downlink subframe.
[0065] In the step, a UE receives downlink PDSCH information sent
by the base station through the SCell. Thereafter, the UE feeds
back an AN for the sent PDSCH to inform the base station of whether
the sent PDSCH information is successfully received.
[0066] Optionally, if a subframe n of a PCell is a downlink
subframe, the embodiment includes the following steps.
[0067] Step 102: Feed back an AN of the sent PDSCH information on a
subframe m or a subframe p of the PCell, where the m, determined
according to the AN timing relationship to which the subframe n of
the PCell corresponds, is a subframe index of a subframe that feeds
back the AN of the PDSCH of the subframe n of the PCell in a PCell,
and the p, determined according to the AN timing relationship to
which the subframe n of the SCell corresponds, is a subframe index
of a subframe that feeds back the AN of the PDSCH of the subframe n
of the SCell in a SCell.
[0068] In the step, preferably, the UE feeds back an AN of the sent
PDSCH information on the subframe m of the PCell. Because the
subframe n of the PCell is a downlink subframe, according to the
timing relationship from the sent PDSCH of the subframe n of the
PCell to the AN, feed back an AN of PDSCH of the subframe n of the
PCell on the subframe m of the PCell, that is, the subframe m of
the PCell is an uplink subframe, and therefore, the UE may feed
back an AN of PDSCH of the subframe n of the SCell on the subframe
m of the PCell, that is, to effectively ensure normal communication
between the base station and the UE.
[0069] If, according to the AN timing relationship to which the
subframe n of the SCell corresponds, an AN of PDSCH of the subframe
n of the SCell is fed back on the subframe p of the SCell, and the
subframe p of the PCell is also an uplink subframe, the UE may
similarly feed back an AN of the PDSCH of the subframe n of the
SCell through the subframe p of the PCell. Therefore, optionally,
in the step, the UE may feed back an AN of the sent PDSCH
information on the subframe p of the PCell.
[0070] Additionally, in another embodiment of the present
invention, in the step, the UE may also select a subframe from the
subframe m and the subframe p of the PCell to feed back an AN of
the sent PDSCH information, and specifically, the UE, according to
latency of the AN of the sent PDSCH information, selects the
subframe that has the smallest latency between the subframe m and
the subframe p of the PCell to feed back an AN of the sent PDSCH
information.
[0071] It should be noted that, because the base station or the UE
needs a period of processing time, the latency of the sent PDSCH
information generally cannot be less than four subframes.
[0072] Optionally, if the subframe n of the PCell is a downlink
subframe, physical downlink control channel (PDCCH) information
sent by the base station through the subframe n of the primary cell
is received. The PDCCH information is used to schedule the PDSCH
information sent by the subframe n of the SCell.
[0073] Optionally, if the subframe n of the PCell is an uplink
subframe, the embodiment includes the following step.
[0074] Step 103: If the subframe p of the PCell is an uplink
subframe, feed back an AN of the sent PDSCH information on the
subframe p of the PCell.
[0075] If the subframe p of the PCell is a downlink subframe,
according to a presetting or a notification of the base station, an
AN of the sent PDSCH information is fed back on an uplink subframe
in a PCell or specified by the presetting or by the notification of
the base station.
[0076] For example, the UE may, according to a presetting or a
notification of the base station, feed back an AN of the sent PDSCH
information on the subframe that has the smallest latency of
feeding back the AN of the sent PDSCH information in a PCell.
[0077] According to the AN timing relationship to which the
subframe n of the SCell corresponds, an AN of PDSCH of the subframe
n of the SCell is fed back on the subframe p of the SCell, and when
the subframe p of the PCell is also an uplink subframe, the UE may
similarly feed back an AN of the PDSCH of the subframe n of the
SCell through the subframe p of the PCell. However, if the subframe
p of the PCell is a downlink subframe, according to a presetting or
a notification of the base station, an AN of the sent PDSCH
information is fed back on an uplink subframe preset in a PCell and
specified by the presetting and the notification of the base
station. Therefore, feeding back the AN of the PDSCH of the
subframe n of the SCell can be normally performed, further
effectively ensuring normal communication between the base station
and the UE.
[0078] Additionally, it should be noted that, in the embodiment of
the present invention, when the UE receives the sent PDSCH sent by
the base station through the downlink subframe of the PCell,
according to the original timing relationship of the PCell, the AN
of the sent PDSCH is fed back.
[0079] Furthermore, because in the embodiment of the present
invention, the uplink AN of the SCell is fed back on the uplink
subframe of the PCell, to prevent the uplink subframe of the PCell
from sending unbalanced number of ANs and ensure the test
performance of ANs, the base station may perform shift processing
of the subframe level for a specified carrier, and performing
shifting of the subframe level for the specified carrier makes the
number of fed back ANs on the uplink subframe of the PCell tends to
be balanced, effectively ensuring the test performance of ANs, and
the subframe configuration of the carrier after being shifted needs
to be known both by the base station and the UE; therefore, the
communication method of the embodiment of the present invention,
before step 101, further includes learning that the base station
performs shift processing of the subframe level for a wireless
frame of the PCell relative to a wireless frame of the SCell; or
learning that the base station performs shift processing of the
subframe level for the wireless frame of the SCell relative to the
wireless frame of the PCell.
[0080] Specifically, the UE may learn that the base station
performs shift processing of the subframe level for the PCell or
the SCell according to the notification of the base station or
presetting.
[0081] The communication method provided by the embodiment of the
present invention for a CA system, in the CA system where each
carrier has a distinct UL-DL configuration, can effectively ensure
that the AN to which the PDSCH of the SCell corresponds is normally
fed back, and therefore further ensure normal communication between
the base station and the UE.
[0082] Corresponding to the method in FIG. 1, an embodiment of the
present invention further provides a communication method for a CA
system, based on the base station serving the UE. As shown in FIG.
2, the method includes the following steps.
[0083] Step 201: Send PDSCH information to a UE through a subframe
n of an SCell.
[0084] Optionally, before the sent PDSCH information to a user
equipment through a subframe n of an SCell, further including:
sending physical downlink control channel (PDCCH) information
through the subframe n of the PCell, where the PDCCH information is
used to schedule the PDSCH information sent by the subframe n of
the SCell.
[0085] If the subframe n of a PCell is an uplink subframe, PDSCH on
the subframe n of the secondary cell is not scheduled. Optionally,
if the subframe n of the PCell is a downlink subframe, the
embodiment includes the following.
[0086] Step 202: Receive an AN of the sent PDSCH information sent
by a UE on a subframe m or a subframe p of the PCell, where the m,
determined according to the AN timing relationship to which the
subframe n of the PCell corresponds, is a subframe index of a
subframe that feeds back the AN of the PDSCH of the subframe n of
the PCell in a PCell, and the p, determined according to the AN
timing relationship to which the subframe n of the SCell
corresponds, is a subframe index of a subframe that feeds back the
AN of the PDSCH of the subframe n of the SCell in a SCell.
[0087] During the normal communication process, the timing
relationship of PDSCH to which the SCell corresponds are known both
by the base station and the UE, that is, the base station knows the
subframe of the UE that feeds back the AN of the sent PDSCH
information in a PCell. Therefore, in the step, the base station
adopts a receiving mode corresponding to the UE to receive the AN
of the sent PDSCH information by the UE in a PCell.
[0088] Because the subframe m of the PCell is an uplink subframe,
and therefore, the UE can feed back an AN of PDSCH of the subframe
n of the SCell through the subframe m of the PCell, and the base
station can receive the sent PDSCH information through the subframe
m of the PCell. However, when the subframe p of the PCell is an
uplink subframe, the UE can similarly feed back an AN of PDSCH of
the subframe n of the SCell through the subframe p of the PCell,
and the base station can receive the sent PDSCH information of the
sent through the subframe p of the PCell. Therefore, feeding back
the AN of the PDSCH of the subframe n of the SCell can be normally
performed, further effectively ensuring normal communication
between the base station and the UE.
[0089] Additionally, in another embodiment of the present
invention, the UE is on the subframe that has the smallest latency
of feeding back an AN of the PDSCH information, when feeding back
the AN of the PDSCH information, the subframe is selected between
the subframe m and the subframe p. In the step, the base station
will receive the AN of the sent PDSCH information sent by the
subframe that has the smallest latency of feeding back the AN of
the sent PDSCH information and, the subframe is selected by the
user equipment between the subframe m and the subframe p of the
PCell.
[0090] Optionally, if the subframe n of the PCell is an uplink
subframe, the embodiment includes the following steps.
[0091] Step 203: If the subframe p of the PCell is an uplink
subframe, receive an AN of the sent PDSCH information sent by a
user equipment on the subframe p of the PCell; if the subframe p of
the PCell is a downlink subframe, receive an AN of the sent PDSCH
information that is sent, according to a presetting or a
notification of a base station, by the user equipment on an uplink
subframe in a PCell and specified by the presetting or the
notification of the base station.
[0092] Additionally, in this situation, the base station may
specify which subframe of the PCell to feed back the AN of the
PDSCH information for the UE. Therefore, the communication method
of the embodiment, further includes sending a notification of a
subframe for instructing a UE to perform AN of the PDSCH
information to the UE.
[0093] Furthermore, because in the embodiment of the present
invention, the uplink AN of the SCell is fed back on the uplink
subframe of the PCell, to prevent the uplink subframe of the PCell
from sending unbalanced number of ANs and ensure the test
performance of ANs, the base station may perform shift processing
of the subframe level for a specified carrier, and performing
shifting of the subframe level for the specified carrier makes the
number of fed back ANs on the uplink subframe of the PCell tends to
be balanced, effectively ensuring the test performance of ANs,
therefore, the communication method of the embodiment, before step
201, further includes performing shift processing of the subframe
level for the wireless frame of the PCell relative to the wireless
frame of the SCell; or performing shift processing of the subframe
level for the wireless frame of the SCell relative to the wireless
frame of the PCell.
[0094] The subframe configuration of the carrier after being
shifted needs to be known by both the base station and the UE, and
therefore, the communication method of the embodiment, after
performing the shift processing, still includes sending a
notification of the shift processing to a UE.
[0095] The communication method provided by the embodiment of the
present invention for a CA system, in the CA system where each
carrier has a distinct UL-DL configuration, can effectively ensure
that the AN to which the PDSCH of the SCell corresponds is normally
fed back, and therefore further ensure normal communication between
the base station and the UE.
[0096] The following further details the communication method for a
CA system through specific embodiments shown in FIG. 1 and FIG.
2.
[0097] As shown in FIG. 3, the CA system in the embodiment is
configured with a PCell and SCell, where the PCell is an UL-DL
configuration 3, and the SCell is an UL-DL configuration 2, and a
subframe marked with a number is an uplink subframe, where the
number indicates the uplink AN of the sent PDSCH of which downlink
subframe needs to be fed back by the current uplink subframe. The
embodiment takes the subframe index n=8 as an example. In view of
FIG. 3, the subframe 8 of the PCell is a downlink subframe. The
embodiment includes the following steps.
[0098] Step 301: Send, by a base station, PDSCH information to a UE
through a subframe 8 of an SCell.
[0099] Step 302: Receive, by the UE, the PDSCH information sent by
a base station through the subframe 8 of the SCell.
[0100] Step 303: Feed back, by the UE, an AN of the sent PDSCH
information on a subframe 3 of a PCell.
[0101] In the step, the UE, according to the timing relationship to
which the subframe 8 of the PCell corresponds, feeds back an AN of
the sent PDSCH information in a PCell. In the view of FIG. 3,
according to the timing relationship to which the subframe 8 of the
PCell corresponds, the subframe that feeds back the AN of PDSCH of
the subframe 8 of the PCell is the subframe 3 of the PCell;
therefore, in the step, the UE feeds back the AN of the sent PDSCH
of the subframe 8 of the SCell on the subframe 3 of the PCell.
[0102] Step 304: Receive, by the base station, AN of the sent PDSCH
information sent by the UE on the subframe 3 of the PCell.
[0103] In another embodiment of the present invention, in the step,
because according to the timing relationship of the SCell, the
subframe of feeding back an AN of PDSCH of the subframe 8 of the
SCell in a SCell is a subframe, and in a PCell, the subframe 2 is
also an uplink subframe; therefore, in step 303, the UE feeds back,
according to the timing relationship to which the subframe 8 of the
SCell corresponds, the AN of the sent PDSCH information on the
subframe 2 of the PCell. In this way, in step 304, a base station
receives the AN of the sent PDSCH information sent on the subframe
2 of the PCell by the UE.
[0104] In another embodiment of the present invention, the UE may
still compare the feedback latency of the foregoing subframes 2 and
3 for feeding back the AN of the sent PDSCH in a PCell in the
foregoing two modes, and the feedback latency of the subframe 2 is
relatively small; therefore, in step 303, the UE adopts the
corresponding second mode, that is, according to the timing
relationship of the SCell, the AN of the sent PDSCH information is
fed back on the subframe 2 of the PCell. In step 304, the base
station receives AN of the sent PDSCH information sent by the UE on
the subframe 2 of the PCell.
[0105] The following similarly takes a CA system with the UL-DL
configuration shown in FIG. 3 as an example to further detail the
communication method for the CA system shown in FIG. 1 and FIG. 2.
In the embodiment, a subframe index n=4 is taken as an example. In
the view of FIG. 3, the subframe 4 of the PCell of an uplink
subframe. The embodiment includes the following steps.
[0106] Step 401: Send, by a base station, PDSCH information to a UE
through a subframe 4 of an SCell.
[0107] Step 402: Receive, by the UE, the PDSCH information sent by
a base station through the subframe 4 of the SCell.
[0108] Step 403: Feed back, by the UE, an AN of the sent PDSCH
information on a subframe 2 of a PCell.
[0109] Step 404: Receive, by a base station, AN of the sent PDSCH
information sent by the UE on the subframe 2 of the PCell.
[0110] Because a subframe, on which the subframe 4 of the SCell
feeds back, according to the timing relationship of the SCell, an
AN of the sent PDSCH information, is the subframe 2, and in a
PCell, the subframe 2 is also an uplink subframe, in the
embodiment, the UE, according to the timing relationship to which
the subframe 4 of the SCell corresponds, feeds back the AN of the
sent PDSCH information on the subframe 2 of the PCell, and
correspondingly, the base station receives the AN of the sent PDSCH
information on the subframe 2 of the PCell.
[0111] The following similarly takes a CA system with the UL-DL
configuration shown in FIG. 3 as an example to further detail the
communication method for the CA system shown in FIG. 1 and FIG. 2.
In the embodiment, a subframe index n=3 is taken as an example. In
the view of FIG. 3, the subframe 3 of the PCell of an uplink
subframe. The embodiment includes the following steps.
[0112] Step 501: Send, by a base station, PDSCH information to a UE
through a subframe 3 of an SCell.
[0113] Step 502: Receive, by the UE, the PDSCH information sent by
a base station through the subframe 3 of the SCell.
[0114] Step 503: According to a presetting, feed back, by the UE,
an AN of the sent PDSCH information on the subframe in a PCell
whose latency is the smallest on the subframe 3 of the SCell.
[0115] Step 504: Receive, by a base station, AN of the sent PDSCH
information sent by the UE on the subframe 2 of the PCell.
[0116] Because a subframe, on which the subframe 3 of the SCell
feeds back, according to the timing relationship of the SCell, AN
of the PDSCH information is a subframe 7, and in a PCell, the
subframe 7 is a downlink subframe and cannot perform AN feedback.
Therefore, in the embodiment, the UE, according to a presetting,
selects the uplink subframe 2 whose latency is the smallest
relative to the subframe 3 of the SCell in a PCell to feed back an
AN of the sent PDSCH information. Correspondingly, the base station
receives AN of the sent PDSCH information on the subframe 2 of the
PCell.
[0117] It should be noted that, in the embodiment of the present
invention, after feeding back the AN to which the PDSCH of the
downlink subframe n of the SCell corresponds to the uplink subframe
of the PCell, the process number of the hybrid automatic
retransmission request HARQ (Hybrid Automatic Repeat Request) of
the SCell will be changed.
[0118] The process number change of the downlink HARQ of the SCell
is taken as an example (supposing that two TDD carriers be
aggregated).
[0119] If the PCell is an UL-DL configuration 2 and the SCell is an
UL-DL configuration 1, according to the timing relationship between
PDSCH of each carrier and the AN, the process number of the
downlink HARQ of the PCell is 10, and the process number of the
downlink HARQ of the SCell is 7; after adopting the technical
solutions provided by the embodiment of the present invention, the
process number of the downlink HARQ of the PCell is not changed,
and the process number of the downlink HARQ of the SCell increases
from 7 to 8.
[0120] If the PCell is an UL-DL configuration 1 and the SCell is
the UL-DL configuration 2, according to the timing relationship
between PDSCH of each carrier and the AN, the process number of the
downlink HARQ of the PCell is 7, and the process number of the
downlink HARQ of the SCell is 10; after adopting the technical
solutions provided by the embodiments of the present invention, the
process number of the downlink HARQ of the PCell is not changed,
and the process number of the downlink HARQ of the SCell decreases
from 10 to 9.
[0121] As shown in FIG. 4, an embodiment of the present invention
further provides a communication method for a CA system, based on a
base station. The CA system is configured with a PCell and an
SCell, where the PCell and the SCell have different UL-DL
configurations, and the embodiment includes the following
steps.
[0122] Step 601: Generate the scheduling information UL_grant for
scheduling physical uplink share channel PUSCH of an uplink
subframe n of an SCell.
[0123] Here, n is a subframe index.
[0124] Optionally, if the subframe n of the PCell is an uplink
subframe, the embodiment includes.
[0125] Step 602: Send the scheduling information UL_grant of the
PUSCH of a UE through a subframe q or a subframe y of the PCell,
where the q, according to the UL_grant timing relationship to which
the subframe n of the PCell corresponds, is a subframe index of a
subframe that sends the scheduling information UL_grant of the
PUSCH of the subframe n of the PCell, and the y, according to the
UL_grant timing relationship to which the subframe n of the SCell
corresponds, is a subframe index of a subframe that sends the
scheduling information UL_grant of the PUSCH of the subframe n of
the SCell.
[0126] In the step, the base station preferably chooses to use the
subframe q of the PCell to send the scheduling information of PUSCH
to the UE. Because the subframe n of the PCell is an uplink
subframe, according to the UL_grant timing relationship to which
the subframe n of the PCell corresponds, send the scheduling
information UL_grant of PUSCH of the subframe n of the PCell on the
subframe q of the PCell, that is, the subframe q of the PCell is a
downlink subframe, the base station may send the scheduling
information UL_grant to the UE through the subframe q of the PCell,
so as to effectively ensure normal communication between the base
station and the UE.
[0127] Optionally, according to the timing relationship of the
SCell, the subframe y sends UL_grant to which the subframe n of the
SCell corresponds, and in a PCell, the subframe y is also a
downlink subframe. The base station can similarly send the
scheduling information UL_grant to the UE through the subframe y of
the PCell; therefore, in the step, the base station can send the
scheduling information UL_grant of the PUSCH to the UE through the
subframe y of the PCell.
[0128] Additionally, in another embodiment of the present
invention, in the step, the base station can also, from the
subframe q and the subframe y of the PCell, select a subframe to
send the scheduling information UL_grant of the PUSCH to the UE.
For example, the base station, from the subframe q and the subframe
y of the PCell, selects a subframe that has the smallest latency
from receiving the scheduling information UL_grant of the PUSCH to
sending the PUSCH by the UE and sends the scheduling information
UL_grant of PUSCH to the UE.
[0129] Optionally, if the subframe n of the PCell is a downlink
subframe, the embodiment includes.
[0130] Step 603: If the subframe y of the PCell is a downlink
subframe, send the scheduling information UL_grant of the PUSCH to
the UE through the subframe y of the PCell, and if the subframe y
of the PCell is an uplink subframe, according to presetting or
locally acquired information, send the scheduling information
UL_grant of the PUSCH to the UE through a downlink subframe in a
PCell and specified by the presetting or the locally acquired
information.
[0131] The locally acquired information of the base station can be
information about service status of the current system and load
balancing condition acquired by the base station, and the like,
according to the locally acquired information, the base station
determines the subframe that sends the scheduling information
UL_grant of the PUSCH in a PCell.
[0132] In the scenario where the base station sends the scheduling
information UL_grant of the PUSCH according to the locally acquired
information, the base station needs to send a notification to the
UE so that the UE learns the subframe that sends the scheduling
information UL_grant of the PUSCH in a PCell.
[0133] The communication method provided by the embodiment of the
present invention for a CA system, in the CA system where each
carrier has a distinct UL-DL configuration, can effectively ensure
that PUSCH of the SCell is normally scheduled, and effectively
ensure normal communication between the base station and the
UE.
[0134] Corresponding to the method in FIG. 4, an embodiment of the
present invention further provides a communication method for a CA
system, based on the UE serving the base station, as shown in FIG.
5.
[0135] If the subframe n of the PCell is an uplink subframe,
optionally, the embodiment includes the following steps.
[0136] Step 701: Receive the scheduling information UL_grant of the
PUSCH information of the subframe n of the SCell, sent on a
subframe q or a subframe y of the PCell by a base station, where
the q, according to the UL_grant timing relationship to which the
subframe n of the PCell corresponds, is a subframe index of a
subframe that sends the scheduling information UL_grant of the
PUSCH of the subframe n of the PCell, and the y, according to the
UL_grant timing relationship to which the subframe n of the SCell
corresponds, is a subframe index of a subframe that sends the
scheduling information UL_grant of the PUSCH of the subframe n of
the SCell.
[0137] During the normal communication process, the timing
relationship of the PUSCH to which the SCell corresponds should be
known by both the base station and the UE, that is, the UE knows
that subframe that sends the scheduling information UL_grant of the
PUSCH in a PCell; and therefore, in the step, the UE adopts a
receiving mode corresponding to the base station side to receive
the scheduling information UL_grant for scheduling the PUSCH of the
uplink subframe n of the SCell.
[0138] Because the subframe q of the PCell is a downlink subframe,
the base station can send the scheduling information UL_grant for
scheduling PUSCH of the uplink subframe n of the SCell through the
subframe q of the PCell. When the subframe y of the PCell is a
downlink subframe, the base station can similarly send the
scheduling information UL_grant for scheduling PUSCH of the uplink
subframe n of the SCell through the subframe y of the PCell, and
the UE can receive the scheduling information UL_grant through the
subframe y of the PCell to effectively ensure that the AN of PDSCH
of the subframe n of the SCell is normally fed back and ensure
normal communication between the base station and the UE.
[0139] Additionally, in yet another embodiment of the present
invention, if a base station, in a subframe q and a subframe y, in
a subframe q and a subframe y, in a subframe q and a subframe y of
the PCell, selects a subframe that has the smallest latency from
receiving the scheduling information UL_grant of the PUSCH to
sending the PUSCH by the UE, sends the scheduling information
UL_grant of the PUSCH to the UE. In the step, the UE receives the
scheduling information UL_grant of the PUSCH information of the
subframe n of the SCell, sent by the subframe that has the smallest
latency from receiving the scheduling information UL_grant of the
PUSCH to sending the PUSCH by the UE and is selected in the
subframe q and the subframe y of the PCell by the base station.
[0140] If the subframe n of the PCell is a downlink subframe,
optionally, the embodiment includes the following steps.
[0141] Step 702: If the subframe y of the PCell is a downlink
subframe, receive the scheduling information UL_grant of the PUSCH
information of the subframe n of the SCell, sent on the subframe y
of the PCell by a base station, and if the subframe y of the PCell
is an uplink subframe, according to a presetting or a notification
of the base station, receive the scheduling information UL_grant of
the PUSCH of the subframe n of the SCell, sent, by the base
station, on a downlink subframe in a PCell and specified by the
presetting and the notification of the base station.
[0142] Step 703: According to the scheduling information UL_grant
of the PUSCH, send the PUSCH on the subframe n of the SCell.
[0143] A communication method provided by the embodiment of the
present invention for a CA system, in the CA system where each
carrier has a distinct UL-DL configuration, can effectively ensure
that PUSCH of the SCell is normally scheduled, and effectively
ensure normal communication between the base station and the
UE.
[0144] The following further details the communication method for a
CA system through specific embodiments shown in FIG. 4 and FIG. 5.
As shown in FIG. 6, the CA system in the embodiment is configured
with a PCell and an SCell, where the PCell is an UL-DL
configuration 1, and the SCell is an UL-DL configuration 2, and a
subframe marked with a number is an uplink subframe, where the
number indicates on which downlink subframe the UL_grant for
scheduling the PUSCH of the current uplink subframe is sent. The
embodiment takes the subframe index n=2 as an example. In view of
FIG. 6, the subframe 2 of the PCell is an uplink subframe, and the
subframe 2 of the SCell is an uplink subframe. The embodiment
includes the following steps.
[0145] Step 801: Generate, by a base station, the scheduling
information UL_grant for scheduling physical uplink share channel
PUSCH of an uplink subframe 2 of an SCell.
[0146] Step 802: Send, by the base station, the scheduling
information UL_grant of PUSCH of the uplink subframe 2 of the SCell
to a UE through a subframe 6 of a PCell.
[0147] Step 803: Receive, by the UE, the scheduling information
UL_grant for scheduling the PUSCH of the uplink subframe 2 of the
SCell, sent by the base station through the subframe 6 of the
PCell.
[0148] Step 804: According to the scheduling information UL_grant
of the PUSCH, send, by the UE, the PUSCH on the subframe 2 of the
SCell.
[0149] In the embodiment, the subframe 2 of the PCell is an uplink
subframe. As shown in FIG. 6, according to the timing relationship
to which the subframe 2 of the PCell corresponds, the UL_grant to
which the subframe 2 of the PCell corresponds is sent on the
subframe 6 of the PCell. Therefore, in the embodiment, the base
station sends the scheduling information UL_grant of PUSCH of the
uplink subframe 2 of the SCell to the UE through the subframe 6 of
the PCell.
[0150] The following further details the communication method for a
CA system through specific embodiments shown in FIG. 4 and FIG. 5.
As shown in FIG. 7, the CA system in the embodiment is configured
with a PCell and an SCell, where the PCell is an UL-DL
configuration 5, and the SCell is an UL-DL configuration 2, and a
subframe marked with a number is an uplink subframe, where the
number indicates on which downlink subframe the UL_grant for
scheduling the PUSCH of the current uplink subframe is sent. The
embodiment takes the subframe index n=7 as an example. In view of
FIG. 7, the subframe 7 of the PCell is an uplink subframe, and the
subframe 7 of the SCell is an uplink subframe. The embodiment
includes the following steps.
[0151] Step 901: Generate, by a base station, the scheduling
information UL_grant for scheduling physical uplink share channel
PUSCH of an uplink subframe 7 of an SCell;
[0152] Step 902: Send, by the base station, the scheduling
information UL_grant of PUSCH of the uplink subframe 7 of the SCell
to a UE through a subframe 3 of a PCell.
[0153] Step 903: Receive, by the UE, the scheduling information
UL_grant for scheduling the PUSCH of the uplink subframe 7 of the
SCell, sent by the base station through the subframe 3 of the
PCell.
[0154] Step 904: According to the scheduling information UL_grant
of the PUSCH, sends, by the UE, the PUSCH on the subframe 7 of the
SCell.
[0155] In the embodiment, the subframe 7 of the PCell is an uplink
subframe. As shown in FIG. 7, according to the timing relationship
to which the subframe 7 of the SCell corresponds, the UL_grant to
which the subframe 7 of the SCell corresponds is sent on the
subframe 3 of the SCell. Therefore, the base station sends the
scheduling information
[0156] UL_grant of PUSCH of the uplink subframe 7 of the SCell to
the UE through the subframe 3 of the PCell.
[0157] It should be noted that, in the embodiment, after the
UL_grant of the PUSCH of the uplink subframe n of the SCell is sent
to the downlink subframe of the PCell, the process number of the
uplink HARQ of the SCell will change.
[0158] Corresponding to the communication method shown in FIG. 1,
an embodiment of the present invention further provides a UE for a
CA system, where the CA system is configured with an SCell and a
PCell, as shown in FIG. 8, includes a receiving unit, configured to
receive PDSCH information sent by a base station through a subframe
n of an SCell, and a feedback unit 11, configured to, if the
subframe n of a PCell is a downlink subframe, feed back an ACK/NACK
of the sent PDSCH information on a subframe m or a subframe p of
the primary cell PCell, where the m, determined according to the
ACK/NACK timing relationship to which the subframe n of the primary
cell PCell corresponds, is a subframe index of a subframe that
feeds back the ACK/NACK of the PDSCH of the subframe n of the
primary cell PCell in a primary cell PCell, and the p, determined
according to the ACK/NACK timing relationship to which the subframe
n of the SCell SCell corresponds, is a subframe index of a subframe
that feeds back the ACK/NACK of the PDSCH of the subframe n of the
SCell SCell in a SCell SCell, or if the subframe n of the PCell is
an uplink subframe, if the subframe p of the primary cell PCell is
an uplink subframe, feed back the ACK/NACK of the sent PDSCH
information on the subframe p of the primary cell PCell; if the
subframe p of the primary cell PCell is a downlink subframe,
according to a presetting or a notification of the base station,
feed back the ACK/NACK of the PDSCH information on the uplink
subframe in a primary cell PCell and specified by the presetting
and the notification of the base station, and for example, feed
back an AN of the sent PDSCH information on an uplink subframe that
has the smallest latency of feeding back the AN of the sent PDSCH
information in a PCell, where, n, m, and p are subframe
indexes.
[0159] The UE provided by the embodiment of the present invention
for a CA system, in the CA system where each carrier has a distinct
UL-DL configuration, can effectively ensure that the uplink AN to
which the SCell corresponds is normally fed back, and therefore
effectively ensure normal communication between the base station
and the UE.
[0160] Optionally, the feedback unit 11 may still be configured to,
when the subframe n of the PCell is a downlink subframe, select a
subframe that has the smallest latency of feeding back the AN of
the PDSCH information between the subframe m and the subframe p of
the PCell to feed back the AN of the sent PDSCH information.
[0161] Furthermore, because the uplink AN of the SCell is fed back
on the uplink subframe of the PCell, to prevent the uplink subframe
of the PCell from sending unbalanced number of ANs and ensure the
test performance of ANs, the base station may perform shift
processing of the subframe level for a specified carrier, and
performing shifting of the subframe level for the specified carrier
makes the number of fed back ANs on the uplink subframe of the
PCell tends to be balanced, effectively ensuring the test
performance of ANs, and the subframe configuration of the carrier
after being shifted needs to be known both by the base station and
the UE; therefore, the UE of the embodiment of the present
invention, as shown in 9, further includes a learning unit 12,
configured to learn shift processing of the subframe level for a
wireless frame of the PCell relative to a wireless frame of the
SCell; or learn shift processing of the subframe level for the
wireless frame of the SCell relative to the wireless frame of the
PCell.
[0162] Specifically, the learning unit 12 may learn that the base
station performs shift processing of the subframe level for the
PCell or the SCell through the notification of the base station or
presetting.
[0163] Optionally, the receiving unit 10 is further configured to
receive physical downlink control channel (PDCCH) information sent
by the base station through the subframe n of the PCell, where the
PDCCH information is used to schedule the PDSCH information sent by
the base station through the subframe n of the SCell.
[0164] Corresponding to the communication method shown in FIG. 2,
an embodiment of the present invention further provides a base
station for a CA system, where the CA system is configured with an
SCell and a PCell, as shown in FIG. 10, includes a sending unit 20,
configured to send PDSCH information to a UE through a subframe n
of an SCell, and a receiving unit 21, configured to, if the
subframe n of a PCell is a downlink subframe, feed back an ACK/NACK
of the sent PDSCH information on a subframe m or a subframe p of
the PCell, where the m, determined according to the ACK/NACK timing
relationship to which the subframe n of the PCell corresponds, is a
subframe index of a subframe that feeds back the ACK/NACK of the
PDSCH of the subframe n of the PCell in a PCell, and the p,
determined according to the ACK/NACK timing relationship to which
the subframe n of the SCell corresponds, is a subframe index of a
subframe that feeds back the ACK/NACK of the PDSCH of the subframe
n of the SCell in a SCell, or if the subframe n of the PCell is an
uplink subframe, if the subframe p of the PCell is an uplink
subframe, receive an ACK/NACK of the sent PDSCH information sent by
a UE on the subframe p of the PCell, and if the subframe p of the
PCell is a downlink subframe, receive an ACK/NACK of the sent PDSCH
information sent by the UE according to a presetting or a
notification of the base station on the uplink subframe in a PCell
and specified by the presetting and the notification of the base
station, where, n, m, and p are subframe indexes.
[0165] The UE provided by the embodiment of the present invention
for a CA system, in the CA system where each carrier has a distinct
UL-DL configuration, can effectively ensure that the uplink AN to
which the SCell corresponds is normally fed back, and therefore
effectively ensure normal communication between the base station
and the UE.
[0166] Optionally, a receiving unit 21 may still be configured to,
when the subframe n of the PCell is a downlink subframe, receive
the AN of the sent PDSCH information sent by the UE on the subframe
m or the subframe n of the PCell that has the smallest latency of
feeding back the AN of the sent PDSCH information.
[0167] Furthermore, because the uplink AN of the SCell is fed back
on the uplink subframe of the PCell, to prevent the uplink subframe
of the PCell from sending unbalanced number of ANs and ensure the
test performance of ANs, the base station may perform shift
processing of the subframe level for a specified carrier, and
performing shifting of the subframe level for the specified carrier
makes the number of fed back ANs on the uplink subframe of the
PCell tends to be balanced, and therefore, the base station
provided by the embodiment of the present invention, as shown in
FIG. 1, further includes a shift unit 22, configured to perform
shift processing of the subframe level for a wireless frame of the
PCell relative to a wireless frame of the SCell; or perform shift
processing of the subframe level for the wireless frame of the
SCell relative to the wireless frame of the PCell.
[0168] Furthermore, to make the subframe configuration of the
carrier after being shifted known by both the base station and the
UE, the sending unit 20 may also send a notification to the UE
about the shift processing.
[0169] Optionally, the sending unit 20 is further configured to
send physical downlink control channel (PDCCH) information through
the subframe n of the PCell, where the PDCCH information is used to
schedule the PDSCH information sent through the subframe n of the
SCell.
[0170] Optionally, the receiving unit 20, if the subframe n of the
PCell is an uplink subframe, does not schedule the PDSCH of the
subframe n of the SCell.
[0171] Corresponding to the communication method shown in FIG. 4,
an embodiment of the present invention further provides a base
station for a CA system, where the CA system is configured with an
SCell and a PCell, as shown in FIG. 12, includes a generation unit
30, configured to generate scheduling information UL_grant for
scheduling PUSCH of an uplink subframe n of an SCell, and a
scheduling unit 31, configured to, if the subframe n of the PCell
is an uplink subframe, send the scheduling information UL_grant of
the PUSCH to a UE through a subframe q or a subframe y of the
PCell, where the q, according to the UL_grant timing relationship
to which the subframe n of the PCell corresponds, is a subframe
index of a subframe that sends the scheduling information UL_grant
of the PUSCH of the subframe n of the PCell, and the y, according
to the UL_grant timing relationship to which the subframe n of the
SCell corresponds, is a subframe index of a subframe that sends the
scheduling information UL_grant of the PUSCH of the subframe n of
the SCell, or if the subframe n of a PCell is a downlink subframe,
if the subframe y of the PCell is a downlink subframe, send the
scheduling information UL_grant of the PUSCH to the UE through the
subframe q of the PCell, and if the subframe y of the PCell is an
uplink subframe, according to presetting or locally acquired
information, send the scheduling information UL_grant of the PUSCH
to the UE through a downlink subframe in a PCell and specified by
the presetting and the locally acquired information, where, n, q,
and y are subframe indexes.
[0172] The base station provided by the embodiment for a CA system,
in the CA system where each carrier has a distinct UL-DL
configuration, can effectively ensure that PUSCH of the SCell is
normally scheduled, and effectively ensure normal communication
between the base station and the UE.
[0173] Optionally, when the subframe n of the PCell is an uplink
subframe, the scheduling unit 31 can still be configured to,
between the subframe q and the subframe y of the PCell, select a
subframe that has the smallest latency from receiving the
scheduling information UL_grant of the PUSCH to sending the PUSCH
by the UE and send the scheduling information UL_grant of PUSCH to
the UE.
[0174] Corresponding to the communication method shown in FIG. 5,
an embodiment of the present invention further provides a UE for a
CA system, where the CA system is configured with an SCell and a
PCell, as shown in FIG. 13, includes a receiving unit 40,
configured to if the subframe n of the PCell is an uplink subframe
receive the scheduling information UL_grant of the PUSCH
information of the subframe n of the SCell, sent on a subframe q or
a subframe y of the PCell by a base station, where the q, according
to the UL_grant timing relationship to which the subframe n of the
PCell corresponds, is a subframe index of a subframe that sends the
scheduling information UL_grant of the PUSCH of the subframe n of
the PCell, and the y, according to the UL_grant timing relationship
to which the subframe n of the SCell corresponds, is a subframe
index of a subframe that sends the scheduling information UL_grant
of the PUSCH of the subframe n of the SCell, or if the subframe n
of the PCell is a downlink subframe, if the subframe y of the PCell
is a downlink subframe, receive the scheduling information UL_grant
of the PUSCH information of the subframe n of the SCell, sent on
the subframe y of the PCell by a base station, and if the subframe
y of the PCell is an uplink subframe, according to a presetting or
a notification of the base station, receive the scheduling
information UL_grant of the PUSCH of the subframe n of the SCell,
sent, by the base station, on a downlink subframe in a PCell and
specified by the presetting and the notification of the base
station, where, n, q, and y are subframe indexes; and a sending
unit 41, configured to send, according to the scheduling
information UL_grant of the PUSCH, the PUSCH on the subframe n of
the SCell.
[0175] The UE provided by the embodiment for a CA system, in the CA
system where each carrier has a distinct UL-DL configuration, can
effectively ensure that PUSCH of the SCell is normally scheduled,
and effectively ensure normal communication between the base
station and the UE.
[0176] Optionally, the receiving unit 40 may still be configured to
receive the scheduling information UL_grant of the PUSCH
information of the subframe n of the SCell, sent by the subframe
that has the smallest latency from receiving the scheduling
information UL_grant of the PUSCH to sending the PUSCH by the UE
and is selected in the subframe q and the subframe y of the PCell
by the base station.
[0177] An embodiment of the present invention provides a
communication method for a CA system, based on a UE. As shown in
FIG. 14, the embodiment includes the following steps.
[0178] Step 1401: Receive physical downlink share channel PDSCH
information sent by a base station through a subframe n of a
secondary cell.
[0179] Step 1402: On a subframe k of a primary cell, feed back an
ACK/NACK of the sent PDSCH information, where the k, determined
according to the ACK/NACK timing relationship of a first reference
TDDUL-DL configuration, is a subframe index of a subframe that
feeds back the ACK/NACK of the subframe n of the secondary cell in
a primary cell.
[0180] Optionally, the first reference TDD UL-DL configuration is
the TDD UL-DL configuration of the primary cell; or, the first
reference TDD UL-DL configuration is a TDD UL-DL configuration
5.
[0181] For example, as shown in FIG. 15, it is assumed that the
primary cell is a TDD UL-DL configuration 1, the secondary cell is
a TDD UL-DL configuration 2, both cells are aggregated to one UE
for data transmission, and it is assumed that the PDSCH to which
the PDCCH of the secondary cell corresponds is sent to the primary
cell, that is, in a cross-carrier scheduling scenario, and it is
assumed that the uplink ACK/NACK must be fed back in a primary
cell. In this way, when the subframe n of the secondary cell is a
downlink 0, 1, 4, 5, 6, or 9, the subframe n of the corresponding
primary cell is also a downlink subframe, where the subframe n of
the primary cell may be used to schedule PDSCH of the subframe n of
the secondary cell by crossing the carrier, and the feedback timing
of the ACK/NACK to which the PDSCH corresponds may be set according
to the timing relationship of the primary cell, that is, the first
reference TDD UL-DL configuration is the TDD UL-DL configuration of
the primary cell. Specifically, the ACK/NACK to which the PDSCH of
the subframes 5 and 6 of the secondary cell corresponds is on the
subframe 2 of the primary cell, and the ACK/NACK feedback to which
the PDSCH of the subframe 8 of the secondary cell is on the
subframe 3 of the primary cell, and the like. It further includes
that the first reference TDD UL-DL configuration is the TDD UL-DL
configuration 5, that is, configuration of nine downlink subframes
and one uplink subframes. For the primary cell whose subframe ns
are downlink subframes 3 and 8, while subframe ns of the
corresponding primary cell is uplink subframes, the base station
does not schedule the PDSCH of the UE on the subframes; therefore,
the UE may assume that the base station does not schedule the PDSCH
of subframes 3 and 8.
[0182] Optionally, if a primary cell and a secondary cell have
different TDD UL-DL configurations and the following conditions
exist: for a first subframe, the subframe of the primary cell is an
uplink subframe while that of the secondary cell is a downlink
subframe; for a second subframe, the subframe of the primary cell
is a downlink subframe while that of the secondary cell is an
uplink subframe (vice versa), the uplink ACK/NACK of the secondary
cell fails to be fed back according to the timing of the primary
cell or the secondary cell, and the ACK/NACK may be fed back by the
secondary cell according to the uplink ACK/NACK timing of the TDD
UL-DL configuration 5. For example, the primary cell is
configuration 2 and the secondary cell is configuration 3, or the
primary cell is configuration 2 and the secondary cell is
configuration 4, still or the primary cell is configuration 1 and
the secondary cell is configuration 3.
[0183] In the technical method, the resources of ACK/NACK are
easily allocated, because if the secondary cell feeds back the
ACK/NACK in a primary cell according to its own timing
relationship, there may be ACK/NACK resource conflict, for example,
if the ACK/NACK to which the subframe 9 of the secondary cell
corresponds is fed back to the subframe 7 of the primary cell
according to its own timing relationship, the base station is
required to resolve the conflict because the subframe 7 of the
primary cell does not reserve implicit ACK/NACK resources for the
subframe 9; conversely, if the ACK/NACK to which subframe 9 of the
secondary cell corresponds is fed back on the subframe 3 of the
primary cell according to the timing relationship of the primary
cell, the base station will not be scheduled to resolve the
ACK/NACK resource conflict because the subframe 3 of the primary
cell reserves implicit ACK/NACK resources for the subframe 9.
Furthermore, the ACK/NACK feedback latency is shortened, such as
the latency of feeding back ACK/NACK to which the subframe 9
corresponds to the subframe 3 is 4, while the latency of feeding
back the ACK/NACK to the subframe 7 is 8. 3) For subframes 3 and 8
of the secondary cell, the policy of not scheduling by the base
station is adopted, which can be easily implemented, and the
secondary cell may feed back the uplink ACK/NACK according to a
complete suite of timing relationship of the primary cell.
[0184] Optionally, the first reference TDD UL-DL configuration uses
a public uplink subframe set or a public uplink subframe subset of
the same time in a primary cell and the secondary cell as uplink
subframes, and other subframes are the TDD UL-DL configuration of
the downlink subframe.
[0185] For example, as shown in FIG. 16, it is assumed that the
primary cell is a TDD UL-DL configuration 1, and the secondary cell
is a TDD UL-DL configuration 3, where the two cells are aggregated
to one UE for data transmission, and it is assumed that the uplink
ACK/NACK must be fed back in a primary cell. Because the subframe 4
is a downlink subframe for the primary cell and an uplink subframe
for the secondary cell; conversely, the subframes 7 and 8 are
uplink subframes for the primary cell and downlink subframes for
the secondary cell; therefore, the uplink ACK/NACK of the primary
cell may be set according to its own timing, but the uplink
ACK/NACK timing of the secondary cell can be set completely
according neither to the timing of the secondary cell nor to the
timing of the primary cell. In this situation, the ACK/NACK timing
of the secondary cell may be set according to the first reference
timing, and the first reference timing may use public uplink
subframes of the same time in a primary and the secondary cell as a
uplink subframe, and other subframes are the timing relationship of
the uplink ACK/NACK of TDD UL-DL configuration of the downlink
subframes, for example, the reference configuration 1 in FIG. b is
configuration 4, that is, the public uplink subframes of the same
time in a primary cell and the secondary cell are uplink subframes
2 and 3, and other subframes are downlink subframes; or the first
reference timing may use the subset of a public uplink subframe set
of the same time in a primary cell and the secondary cell as a
uplink subframe, and other eight subframes are the timing
relationship of the uplink ACK/NACK of the TDD UL-DL configuration
of the downlink subframe, for example, the reference configuration
2 in FIG. b is configuration 5, that is, the public uplink subframe
set of the same time in a primary cell and the secondary cell
includes uplink subframes 2 and 3, one subframe of which may be an
uplink subframe 2, and other nine subframes are all downlink
subframes. The solution may make the secondary cell feed back the
uplink ACK/NACK according to a complete suite of reference
configuration.
[0186] Optionally, if the downlink subframe of the secondary cell
corresponds to at least two types of the first reference TDD UL-DL
configurations, further including: determining the first reference
TDD UL-DL configuration to which the subframe n of the secondary
cell corresponds from the at least two types of the first reference
TDD UL-DL configurations; the k, determined according to the
ACK/NACK timing relationship of the first reference TDD UL-DL
configuration to which the subframe n of the secondary cell
corresponds, is a subframe index of a subframe that feeds back the
ACK/NACK to which the subframe n of the secondary cell corresponds
in a primary cell.
[0187] For example, as shown in FIG. 17, the primary cell is the
TDD UL-DL configuration 1, and the secondary cell is the TDD UL-DL
configuration 2, where the two cells are aggregated to one UE for
data transmission, and the uplink ACK/NACK must be fed back in a
primary cell. In this way, downlink subframes 4 and 9 of the
secondary cell may form a first group, and the remaining downlink
subframes form a second group. The uplink ACK/NACK of the first
group subframe may be fed back according to the first type of
ACK/NACK timing relationship of the first reference TDD UL-DL
configuration, for example, the first type of the first reference
TDD UL-DL configuration is the configuration of the primary cell or
other configurations; the uplink ACK/NACK of the second group
subframe may be fed back according to the second type of ACK/NACK
timing relationship of the first reference TDD UL-DL configuration,
for example, the second type of the first reference TDD UL-DL
configuration is the configuration of the secondary cell or other
configurations. The solution shortens the latency of ACK/NACK
feedback to which certain downlink subframes of the secondary
cell.
[0188] Optionally, if the subframe n of the primary cell is a
downlink subframe, further including: receiving PDCCH sent by the
base station on the subframe n of the primary cell, where the PDCCH
is used to schedule the PDSCH of the subframe n of the secondary
cell.
[0189] An embodiment of the present invention provides a user
equipment for performing the foregoing method. As shown in FIG. 18,
the user equipment includes a receiving unit 1801, configured to
receive physical downlink share channel PDSCH information sent by a
base station through a subframe n of a secondary cell, a processing
unit 1802, configured for a subframe k, determined according to the
ACK/NACK timing relationship of a first reference TDD UL-DL
configuration, is a subframe index of a subframe that feeds back
the ACK/NACK to which the subframe n of the secondary cell
corresponds in a primary cell, and a sending unit 1803, configured
to feed back the ACK/NACK of the PDSCH information received by the
receiving unit 1801 on the subframe k determined by the processing
unit 1801 in a primary cell.
[0190] Optionally, the first reference TDD UL-DL configuration is
the TDD UL-DL configuration of the primary cell; or, the first
reference TDD UL-DL configuration is a TDD UL-DL configuration
5.
[0191] Optionally, the first reference TDD UL-DL configuration uses
a public uplink subframe set or a public uplink subframe subset of
the same time in a primary cell and the secondary cell as uplink
subframes, and other subframes are the TDD UL-DL configuration of
the downlink subframe.
[0192] Optionally, if the downlink subframe of the secondary cell
corresponds to at least two types of the first reference TDD UL-DL
configurations, the processing unit is further configured to
determine the first reference TDD UL-DL configuration to which the
subframe n of the secondary cell corresponds from the at least two
types of the first reference TDD UL-DL configurations; specifically
configured for the k, determined according to the ACK/NACK timing
relationship of the first reference TDD UL-DL configuration to
which the subframe n of the secondary cell corresponds, is a
subframe index of a subframe that feeds back the ACK/NACK to which
the subframe n of the secondary cell corresponds in a primary
cell.
[0193] Optionally, if the subframe n of the primary cell is a
downlink subframe, the receiving unit is further configured to
receive PDCCH sent by the base station on the subframe n of the
primary cell, where the PDCCH is used to schedule the PDSCH of the
subframe n of the secondary cell.
[0194] For the effects of the user equipment, reference may be made
to description of embodiments.
[0195] An embodiment of the present invention provides a
communication method for a CA system, based on a UE. As shown in
FIG. 19, the embodiment includes the following steps.
[0196] Step 1901: Send physical downlink share channel PDSCH
information to a user equipment through a subframe n of a secondary
cell.
[0197] Step 1902: On a subframe k of a primary cell, receive an
ACK/NACK of the sent PDSCH information fed back by the user
equipment, where the k, determined by the user equipment according
to the ACK/NACK timing relationship of a first reference TDD UL-DL
configuration, is a subframe index of a subframe that feeds back
the ACK/NACK of the subframe n of the secondary cell in a primary
cell.
[0198] Optionally, the first reference TDD UL-DL configuration is
the TDD UL-DL configuration of the primary cell, or, the first
reference TDD UL-DL configuration is a TDD UL-DL configuration
5.
[0199] Optionally, the first reference TDD UL-DL configuration uses
a public uplink subframe set or a public uplink subframe subset of
the same time in a primary cell and the secondary cell as uplink
subframes, and other subframes are the TDD UL-DL configuration of
the downlink subframe.
[0200] Optionally, if the downlink subframe of the secondary cell
corresponds to at least two types of the first reference TDD UL-DL
configurations, the k, determined according to the first reference
TDD UL-DL configuration that the subframe n of the secondary cell
corresponds to and is determined by the user equipment from the at
least two types of the first reference TDD UL-DL configurations, is
a subframe index of a subframe that feeds back the subframe n of
the secondary cell in a primary cell.
[0201] Optionally, where if the subframe n of the primary cell is a
downlink subframe, further including: receiving PDCCH sent by the
base station on the subframe n of the primary cell, where the PDCCH
is used to schedule the PDSCH of the subframe n of the secondary
cell.
[0202] Optionally, if the subframe n of the primary cell is an
uplink subframe, PDSCH of the subframe n of the secondary cell is
not scheduled.
[0203] For the effects of the solution, reference may be made to
FIG. 14.
[0204] An embodiment of the present invention provides a base
station for performing the foregoing method. As shown in FIG. 20,
the base station includes a sending unit 2001, configured to send
physical downlink share channel PDSCH information to a user
equipment through a subframe n of a secondary cell, and a receiving
unit 2002, configured to receive, on a subframe k of a primary
cell, an ACK/NACK of the PDSCH information received by the
receiving unit 2001 and fed back by the user equipment, where the
k, determined by the user equipment according to the ACK/NACK
timing relationship of a first reference TDD UL-DL configuration,
is a subframe index of a subframe that feeds back the ACK/NACK of
the subframe n of the secondary cell in a primary cell.
[0205] Optionally, the first reference TDD UL-DL configuration uses
a public uplink subframe set or a public uplink subframe subset of
the same time in a primary cell and the secondary cell as uplink
subframes, and other subframes are the TDD UL-DL configuration of
the downlink subframe.
[0206] Optionally, if the downlink subframe of the secondary cell
corresponds to at least two types of the first reference TDD UL-DL
configurations, the k, determined according to the first reference
TDD UL-DL configuration that the subframe n of the secondary cell
corresponds to and is determined by the user equipment from the at
least two types of the first reference TDD UL-DL configurations, is
a subframe index of a subframe that feeds back the subframe n of
the secondary cell in a primary cell.
[0207] Optionally, if the subframe n of the primary cell is a
downlink subframe, the sending unit is further configured to send
PDCCH to the user equipment on the subframe n of the primary cell,
where the PDCCH is used to schedule the PDSCH of the subframe n of
the secondary cell.
[0208] Optionally, if the subframe n of the primary cell is an
uplink subframe, the sending unit does not schedule PDSCH of the
subframe n of the secondary cell.
[0209] For the effects of the solution, reference may be made to
FIG. 14.
[0210] An embodiment of the present invention provides a
communication method for a CA system, based on a UE. As shown in
FIG. 21, the embodiment includes the following steps.
[0211] Step 2101: Generate scheduling information UL_grant for
scheduling PUSCH of an uplink subframe n of a secondary cell of a
user equipment.
[0212] Step 2102: Send the scheduling information UL_grant of PUSCH
to the user equipment through the subframe j of the primary cell,
where the j, determined according to the uplink scheduling timing
relationship of the first reference TDD UL-DL configuration, is a
subframe index of a subframe that sends the scheduling information
UL_grant of PUSCH of the subframe n of the secondary cell.
[0213] Optionally, the uplink scheduling timing relationship of the
first reference TDD UL-DL configuration includes: the timing
relationship of PUSCH to which UL_grant corresponds, or the timing
relationship of PHICH to which PUSCH corresponds, where PHICH is
the downlink ACK/NACK.
[0214] Optionally, of the first reference TDD UL-DL configuration
is the TDD UL-DL configuration of the primary cell, or the TDD
UL-DL configuration of the secondary cell, or a TDD UL-DL
configuration 0, or a TDD UL-DL configuration 6, or a TDD UL-DL
configuration 1.
[0215] Optionally, the j, determined according to a part of uplink
scheduling timing relationships on at least one HARQ process of TDD
UL-DL configuration, is a subframe index of a subframe that sends
the scheduling information UL_grant of PUSCH of the uplink subframe
n of the secondary cell. The first reference TDD UL-DL
configuration may be configuration 0 or 6.
[0216] Optionally, the j, determined according to a part of or all
uplink scheduling timing relationships on at least one uplink index
of the first reference TDD UL-DL configuration, is a subframe index
of a subframe that sends the scheduling information UL_grant of
PUSCH of the uplink subframe n of the secondary cell. The first
reference TDD UL-DL configuration may be configuration 0.
[0217] The method of the embodiment (steps 2101 and 2102)
(including the following UE side method and double-side apparatus)
may still be applied to a dynamic subframe scenario. Specifically,
a single cell (namely, a single-carrier) is taken as an example.
When the TDD UL-DL configuration is notified through the
broadcasting information, the TDD configuration is also named
backward-compatibility TDD configuration, and if the notified
current configuration is configuration 2, that is, DL:UL is 4:1
(down down up down down down down up down down), the to-be-evolved
TDD system will introduce the dynamic subframe technology, that is,
certain subframes in configuration 2 may be dynamically set to be
uplink or downlink, for example, subframes 3 and 4 in configuration
2, that is, down down up dynamic down down down up dynamic down
("dynamic" indicates a dynamic subframe), and the dynamic subframe
base station may schedule the UE to send uplink data PUSCH or
uplink ACK/NACK; otherwise, the UE tests PDCCH and other downlink
control channels for the downlink subframe according to the
default. Once a dynamic subframe is used to be uplink at a certain
moment, the UL_grant that is sent on the dynamic subframe based on
the original time sequence fails to be sent, and the original time
sequence may be indicated as a first time sequence, that is, the
time sequence determined by the TDD UL-DL configuration that is
determined based on the broadcasting information, for example, the
uplink scheduling time sequence of the configuration 2 is a dynamic
subframe and used to be uplink, the UL_grant to which subframes 2
and 7 based on the first time sequence corresponds fails to be
sent. At this moment, a second time sequence may be introduced,
which is similar to the timing relationship of the first reference
TDD UL-DL configuration in the embodiment, and the second time
sequence is used to determine uplink scheduling and PHICH feedback
time sequence.
[0218] For example, as shown in FIG. 22, it is assumed that the
primary cell is the TDD UL-DL configuration 0, the secondary cell
is a TDD UL-DL configuration 3, both cells are aggregated to one UE
for data transmission, and it is assumed that the UL_grant to which
the PDCCH of the secondary cell corresponds is sent in a primary
cell, that is, in a uplink cross-carrier scheduling scenario, and
it is assumed that the downlink ACK/NACK, also named physical HARQ
indication channel (Physical HARQ Indicator Channel, PHICH) must be
fed back in a primary cell.
[0219] At this moment, if the secondary cell sends the UL_grant
according to the uplink scheduling timing of the secondary cell,
the sending subframe of the UL_grant of the scheduling subframe 2
is the subframe 8, but the subframe 8 of the primary cell is an
uplink subframe and fails to send the UL_grant, and because the
subframe 4 of the primary cell is downlink, and the primary cell
does not have the uplink scheduling timing of the uplink subframe 4
of the secondary cell, the secondary cell fails to send the
UL_grant or corresponding PHICH according to the primary cell or a
complete suite of uplink scheduling timing of the secondary cell.
In this way, the secondary cell may send the UL_grant and the
corresponding PHICH according to the uplink scheduling timing of
the first reference TDD UL-DL configuration, and the first
reference TDD UL-DL configuration may be configuration 0 or 6.
[0220] As shown in FIG. 23, it is assumed that the primary cell is
the TDD UL-DL configuration 0, the secondary cell is the TDD UL-DL
configuration 1, both cells are aggregated to one UE for data
transmission, the PDSCH to which the PDCCH of the secondary cell
corresponds is sent to the primary cell, that is, in a
cross-carrier scheduling scenario, and it is assumed that the PHICH
must be fed back in a primary cell. At this moment, the secondary
cell sends the UL_grant and the corresponding PHICH according to
the uplink timing relationship of the primary cell. Specifically,
the uplink scheduling timing of the primary cell is in closing
cycle mode.
[0221] A HARQ process is taken as an example, where the uplink
timing of the HARQ process of the data packet PUSCH of the subframe
2 is {(5 or 6)->2, 6->3, 0->4, 0->7, 1->8, 5->9,
5->2}, where the first item within braces is the timing of the
UL_grant to an initial transmission packet PUSCH, and each of the
remaining items is the timing of PHICH to the retransmission packet
PUSCH of the initial transmission packet. If the secondary cell
sends the UL_grant and PHICH according to the timing of the primary
cell, the timing is {(5 or 6)->2, 6->3, 0->7, 1->8,
5->2}, or {5->2, 6->3, 0->7, 1->8, 5->2}, or
{6->2, 6->3, 0->7, 1->8, 5->2}, where the first item
is the timing of the UL_grant to an initial transmission packet
PUSCH, and each of the remaining items is the timing of PHICH to
the retransmission packet PUSCH of the initial transmission
packet.
[0222] Based on the above, the three timing is a part of the uplink
timing of the HARQ process of the subframe 2 in TDD configuration 0
of the primary cell, and because the subframes 4 and 9 of the
secondary cell are both downlink subframes and the secondary cell
does not need to do send the UL_grant and the corresponding PHICH
according to the uplink timing of the primary cell. Further
specifically, the latter two of the three timing only use one set
of the two sets of timing of the uplink index in the UL_grant,
namely, a part of {(5 or 6)->2}, that is 5->2 or 6->2,
because the number of the uplink subframe of the primary cell is
moret than the number of downlink subframes, and then the uplink
index field in the UL_grant is required to make the UL_grant to
schedule two uplink subframes, and the ratio of uplink and downlink
subframes of the secondary cell is 4:6, that is, the uplink index
is not required, and then it is enough to determine one set in two
sets of timing of the uplink index of the primary cell; or when
adopting two sets of timing of the uplink index, it only needs to
add the uplink index field to the UL_grant of the secondary cell,
where the field may be a newly added bit, a scrambling code, or
reuse the current bit, such as reusing the downlink assignment
indication (DAI, Downlink Assignment Index) of the UL_grant, and
for this example, reference may be made to the primary cell (UL-DL
configuration 0, a ratio of 6:4 of uplink and downlink
subframes)+secondary cell (UL-DL configuration 6, a ratio of 5:5 of
uplink and downlink subframes), because each uplink subframe of the
configuration 6 only needs to feed back one uplink ACK/NACK to
which a downlink subframe corresponds, and then DAI in the UL_grant
of the secondary cell may be reused as an uplink index.
[0223] Similarly, it is assumed that the backward-compatibility TDD
UL-DL configuration is configuration 2 and a dynamic subframe
exists, and the directions of 10 subframes of a wireless frame are
respectively down down up dynamic down down down up dynamic down,
for an evolved UE, the time sequence relationship may depend on the
second time sequence, for example, the second time sequence is used
to determine the uplink scheduling and PHICH feedback time
sequence, similar to the first reference TDD UL-DL configuration.
For example, the second time sequence may be the timing
relationship of the TDD UL-DL configuration 0. In this situation,
the UE may determine, according to a part of uplink scheduling
timing relationship of at least one HARQ process of the TDD UL-DL
configuration 0, the subframe that sends the scheduling information
UL_grant of PUSCH of the uplink subframe n.
[0224] Furthermore, the UE may determine, according to a part of or
all timing relationships in the uplink scheduling timing
relationships of at least one uplink index of the TDD UL-DL
configuration 0, the subframe that sends the scheduling information
UL_grant of PUSCH of the uplink subframe n. For detailed examples,
reference may be made to the foregoing examples about the primary
and secondary cells except that the timing of the primary cell is
understood as the timing of the backward-compatibility TDD UL-DL
configuration, such as the foregoing configuration 2, and the
timing of the secondary cell is understood as the timing determined
by the foregoing second time sequence, such as timing determined by
the foregoing configuration 0.
[0225] For another example, as shown in FIG. 24, it is assumed that
the primary cell is the TDD UL-DL configuration 0, the secondary
cell is a TDD UL-DL configuration 2, both cells are aggregated to
one UE for data transmission, and it is assumed that the UL_grant
to which the PUSCH of the secondary cell corresponds is sent to the
primary cell, that is, in a cross-carrier scheduling scenario, and
it is assumed that the PHICH must be fed back in a primary cell. If
the secondary cell sends the UL_grant and corresponding PHICH
according to its own uplink scheduling timing, the sending is
performed on subframes 3 and 8. However, the subframes 3 and 8 of
the primary cell are both uplink subframes and fail to send the
UL_grant and PHICH. At this moment, if the uplink scheduling timing
of the primary cell is adopted, the round trip time of the uplink
HARQ is relatively long, because the uplink scheduling timing of
the TDD UL-DL configuration 0 adopts the cycling mode. Therefore,
the secondary cell may send the UL_grant and corresponding PHICH
according to reference configuration, and the reference
configuration may be the TDD UL-DL configuration 1, that is, the
UL_grant and PHICH of uplink subframes 2 and 7 of the secondary
cell may be respectively sent to subframes 6 and 1 of the primary
cell to ensure short round trip time of the uplink HARQ.
[0226] Optionally, if a primary cell and a secondary cell have
different TDD UL-DL configurations and the following conditions
exist: for a first subframe, the subframe of the primary cell is an
uplink subframe while that of the secondary cell is a downlink
subframe; for a second subframe, the subframe of the primary cell
is a downlink subframe while that of the secondary cell is an
uplink subframe (vice versa), the uplink scheduling of the
secondary cell fails to be scheduled according to the uplink
scheduling timing of the primary cell or the secondary cell, and
the secondary cell may be scheduled according to scheduling timing
of the TDD UL-DL configuration 1. For example, the primary cell is
configuration 2 and the secondary cell is configuration 3, or the
primary cell is configuration 2 and the secondary cell is
configuration 4, still or the primary cell is configuration 1 and
the secondary cell is configuration 3.
[0227] Optionally, if the round trip latency of the uplink HARQ of
the primary cell or the secondary cell is larger than 10 subframes,
the secondary cell may perform uplink scheduling according to the
uplink scheduling timing of the TDD UL-DL configuration 1.
Specifically, the round trip latency of uplink HARQ of TDD UL-DL
configurations 1 to 5, that is, the latency from a PUSCH initial
transmission packet of a subframe to first sending of the
retransmission packet to which the initial transmission packet
corresponds is 10 subframes. For TDD UL-DL configuration 0 or 6,
the round trip latency of the uplink HARQ is larger than 10
subframes. If the configuration 0 or 6 is used to be the first
reference TDD UL-DL configuration in the future, the sending time
of some PUSCH retransmission packets of the secondary cell are not
uplink subframes in a secondary cell, and the secondary cell may
perform uplink scheduling according to uplink scheduling timing of
the TDD UL-DL configuration 1, that is, to consider the TDD UL-DL
configuration 1 as the first reference TDD UL-DL configuration.
[0228] Optionally, if the uplink subframe of the secondary cell
corresponds to at least two types of the first reference TDD UL-DL
configurations, further including: determining the first reference
TDD UL-DL configuration to which the subframe n of the secondary
cell corresponds from the at least two types of the first reference
TDD UL-DL configurations; the j, determined according to the uplink
scheduling relationship of the first reference TDD UL-DL
configuration to which the subframe n of the secondary cell
corresponds, is a subframe index of a subframe that sends the
scheduling information UL_grant of PUSCH of the subframe n of the
secondary cell.
[0229] For example, as shown in FIG. 25, it is assumed that the
primary cell is the TDD UL-DL configuration 2, the secondary cell
is the TDD UL-DL configuration 1, both cells are aggregated to one
UE for data transmission, and it is assumed that the PDSCH to which
the PDCCH of the secondary cell corresponds is sent to the primary
cell, that is, in a cross-carrier scheduling scenario, and it is
assumed that the PHICH must be fed back in a primary cell. It is
assumed that the uplink subframes 3 and 8 of the secondary cell
form a first subframe group, and uplink subframes 2 and 7 form a
second subframe group, the uplink scheduling timing of the first
subframe group may be performed according to the uplink scheduling
timing of the secondary cell (a second reference TDD UL-DL
configuration), that is, to send the UL_grant and corresponding
PHICH respectively on subframes 9 and 4 of the primary cell; at
this moment, PHICH may be not sent because the primary cell does
not have PHICH resources of a backward-compatibility system; the
uplink scheduling timing of the second subframe group may be
performed according to the uplink scheduling timing of the primary
cell (a third reference TDD UL-DL configuration), that is, to send
the UL_grant and corresponding PHICH respectively on the subframes
8 and 3 of the primary cell to ensure short UL_grant scheduling
latency, and the corresponding subframe of the primary cell has
PHICH resources of a backward-compatibility system.
[0230] The method provided by the embodiment for a CA system, in
the CA system where each carrier has a distinct UL-DL
configuration, can effectively ensure that PUSCH of the SCell is
normally scheduled, and effectively ensure normal communication
between the base station and the UE.
[0231] An embodiment of the present invention provides a base
station for a CA system, for performing the foregoing method,
include the following units.
[0232] A processing unit, configured to generate scheduling
information UL_grant for scheduling PUSCH of an uplink subframe n
of a secondary cell of a user equipment, and configured for,
determined according to the timing relationship of the uplink
scheduling of a first reference TDD UL-DL configuration, a subframe
index j of a subframe that sends the scheduling information
UL_grant of PUSCH of the subframe n of the secondary cell;
[0233] A sending unit, configured to send, according to the
subframe j of the primary cell, the UL_grant generated by the
processing unit to a user equipment.
[0234] Optionally, the uplink scheduling timing relationship of the
first reference TDD UL-DL configuration includes: the timing
relationship of PUSCH to which UL_grant corresponds, or the timing
relationship of PHICH to which PUSCH corresponds, where PHICH is
the downlink ACK/NACK.
[0235] Optionally, the first reference TDD UL-DL configuration is
the TDD UL-DL configuration of the primary cell, or the TDD UL-DL
configuration of the secondary cell, or a TDD UL-DL configuration
0, or a TDD UL-DL configuration 6, or a TDD UL-DL configuration
1.
[0236] Optionally, if the first reference TDD UL-DL configuration
is the TDD UL-DL configuration 6, the processing unit is
specifically configured to determine, according to a part of uplink
scheduling timing relationships on at least one HARQ process of the
TDD UL-DL configuration 6, a subframe index j of a subframe that
sends the scheduling information UL_grant of PUSCH of the uplink
subframe n of the secondary cell.
[0237] Optionally, if the first reference TDD UL-DL configuration
is the TDD UL-DL configuration 0, the processing unit is
specifically configured to determine, according to a part of or all
uplink scheduling timing relationships of at least one uplink index
process of the TDD UL-DL configuration 0, a subframe index of a
subframe that sends the scheduling information UL_grant of PUSCH of
the uplink subframe n of the secondary cell.
[0238] Optionally, if the uplink subframe of the secondary cell
corresponds to at least two types of the first reference TDD UL-DL
configurations, the processing unit is further configured to
determine the first reference TDD UL-DL configuration to which the
subframe n of the secondary cell corresponds from the at least two
types of the first reference TDD UL-DL configurations, and
specifically configured to determine, according to the uplink
scheduling relationship of the first reference TDD UL-DL
configuration to which the subframe n of the secondary cell
corresponds, a subframe index j of a subframe that sends the
scheduling information UL_grant of PUSCH of the subframe n of the
secondary cell.
[0239] The base station provided by the embodiment for a CA system,
in the CA system where each carrier has a distinct UL-DL
configuration, can effectively ensure that PUSCH of the SCell is
normally scheduled, and effectively ensure normal communication
between the base station and the UE.
[0240] An embodiment of the present invention provides a
communication method for a CA system, based on a user equipment.
The embodiment includes the following steps receiving the
scheduling information UL_grant of the PUSCH information of the
subframe n of the secondary cell, sent by a base station on a
subframe j of a primary cell, where the j, determined according to
the timing relationship of the uplink scheduling of the first
reference TDD UL-DL configuration, is a subframe index of a
subframe that sends the scheduling information UL_grant of PUSCH of
the subframe n of the secondary cell, and according to the
scheduling information UL_grant of the PUSCH, sending the PUSCH on
the subframe n of the secondary cell.
[0241] Optionally, the uplink scheduling timing relationship of the
first reference TDD i UL-DL configuration includes: the timing
relationship of PUSCH to which UL_grant corresponds, or the timing
relationship of PHICH to which PUSCH corresponds, where PHICH is
the downlink ACK/NACK.
[0242] Optionally, the first reference TDD UL-DL configuration is
the TDD UL-DL configuration of the primary cell, or the TDD UL-DL
configuration of the secondary cell, or a TDD UL-DL configuration
0, or a TDD UL-DL configuration 6, or a TDD UL-DL configuration
1.
[0243] Optionally, if the first reference TDD UL-DL configuration
is the TDD UL-DL configuration 6, the j, determined according to a
part of upstream scheduling timing relationships of at least one
HARQ process of the TDD UL-DL configuration 6, is a subframe index
of a subframe that sends the scheduling information UL_grant of
PUSCH of the subframe n of the secondary cell.
[0244] Optionally, if the first reference TDD UL-DL configuration
is the TDD UL-DL configuration 0, the j, determined according to a
part of or all upstream scheduling timing relationships of at least
one uplink index of the TDD UL-DL configuration 6, is a subframe
index of a subframe that sends the scheduling information UL_grant
of PUSCH of the subframe n of the secondary cell.
[0245] Optionally, if the uplink subframe of the secondary cell
corresponds to at least two types of the first reference TDD UL-DL
configurations, further including: determining the first reference
TDD UL-DL configuration to which the subframe n of the secondary
cell corresponds from the at least two types of the first reference
TDD UL-DL configurations; the j, determined according to the uplink
scheduling relationship of the first reference TDD UL-DL
configuration to which the subframe n of the secondary cell
corresponds, is a subframe index of a subframe that sends the
scheduling information UL_grant of PUSCH of the subframe n of the
secondary cell.
[0246] The method provided by the embodiment for a CA system, in
the CA system where each carrier has a distinct UL-DL
configuration, can effectively ensure that PUSCH of the SCell is
normally scheduled, and effectively ensure normal communication
between the base station and the UE.
[0247] An embodiment of the present invention provides a user
equipment for a CA system, for performing the foregoing method,
including a receiving unit, configure to receive the scheduling
information UL_grant of the PUSCH information of the subframe n of
the secondary cell, sent by a base station on a subframe j of a
primary cell, where the j, determined by the base station according
to the timing relationship of the uplink scheduling of the first
reference TDD UL-DL configuration, is a subframe index of a
subframe that sends the scheduling information UL_grant of PUSCH of
the subframe n of the secondary cell, and a sending unit,
configured to send, according to the scheduling information
UL_grant of the PUSCH of the processing unit, the PUSCH on the
subframe n of the secondary cell.
[0248] Optionally, the uplink scheduling timing relationship of the
first reference TDD UL-DL configuration includes the timing
relationship of PUSCH to which UL_grant corresponds, or the timing
relationship of PHICH to which PUSCH corresponds, where PHICH is
the downlink ACK/NACK.
[0249] Optionally, the first reference TDD UL-DL configuration is
the TDD UL-DL configuration of the primary cell, or the TDD UL-DL
configuration of the secondary cell, or a TDD UL-DL configuration
0, or a TDD UL-DL configuration 6, or a TDD UL-DL configuration
1.
[0250] Optionally, if the first reference TDD UL-DL configuration
is the TDD UL-DL configuration 6, the j, determined according to a
part of uplink scheduling timing relationships of at least one HARQ
process of the TDD UL-DL configuration 6, is a subframe index of a
subframe that sends the scheduling information UL_grant of PUSCH of
the subframe n of the secondary cell.
[0251] Optionally, if the first reference TDD UL-DL configuration
is the TDD UL-DL configuration 0, the j, determined according to a
part of or all uplink scheduling timing relationships of at least
one uplink index of the TDD UL-DL configuration 6, is a subframe
index of a subframe that sends the scheduling information UL_grant
of PUSCH of the subframe n of the secondary cell.
[0252] Optionally, if the subframe of the secondary cell
corresponds to at least two types of the first reference TDD UL-DL
configuration, the j, determined by the base station according to
the at least two types of the first reference TDD UL-DL
configuration and determined by the uplink scheduling timing
relationship of the first reference TDD UL-DL configuration to
which the subframe n of the secondary cell corresponds, is a
subframe index of a subframe that sends the scheduling information
UL_grant of PUSCH of the subframe n of the secondary cell.
[0253] The user equipment provided by the embodiment for a CA
system, in the CA system where each carrier has a distinct UL-DL
configuration, can effectively ensure that PUSCH of the SCell is
normally scheduled, and effectively ensure normal communication
between the base station and the UE.
[0254] Persons of ordinary skill in the art should understand that
all or a part of the processes of the methods in the embodiments
may be implemented by a computer program instructing relevant
hardware. The program may be stored in a computer readable storage
medium. When the program is run, the steps of the methods in the
embodiments are performed. The storage medium may be any medium
capable of storing program codes, such as a ROM, a RAM, a magnetic
disk, an optical disk, and the like.
[0255] The foregoing descriptions are merely specific embodiments
of the present invention, but are not intended to limit the
protection scope of the present invention. Any variation or
replacement readily figured out by persons skilled in the art
within the technical scope disclosed in the present invention shall
fall within the protection scope of the present invention.
Therefore, the protection scope of the present invention shall be
subject to the protection scope of the claims.
* * * * *