U.S. patent application number 14/602793 was filed with the patent office on 2015-05-21 for method for configuring phich carrier linkage.
The applicant listed for this patent is NEC Corporation. Invention is credited to Boon Loong NG.
Application Number | 20150139150 14/602793 |
Document ID | / |
Family ID | 43586131 |
Filed Date | 2015-05-21 |
United States Patent
Application |
20150139150 |
Kind Code |
A1 |
NG; Boon Loong |
May 21, 2015 |
METHOD FOR CONFIGURING PHICH CARRIER LINKAGE
Abstract
There is provided a method of configuring the downlink component
carrier between one or more linkage methods for PHICH reception on
User Equipment (UE), which is configured for carrier aggregation,
over a mobile communication network. This method includes (a)
providing an indicator, and (b) determining whether the PHICH
carrier linkage should be dynamic linkage or cell specific, based
on the value of the indicator.
Inventors: |
NG; Boon Loong; (Victoria,
AU) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NEC Corporation |
Tokyo |
|
JP |
|
|
Family ID: |
43586131 |
Appl. No.: |
14/602793 |
Filed: |
January 22, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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13387576 |
Jan 27, 2012 |
8971347 |
|
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14602793 |
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Current U.S.
Class: |
370/329 |
Current CPC
Class: |
H04W 74/006 20130101;
H04W 72/1289 20130101; H04W 72/14 20130101; H04W 72/0453 20130101;
H04L 5/0091 20130101; H04W 72/0406 20130101; H04W 72/042 20130101;
H04L 5/0075 20130101; H04L 5/0096 20130101; H04L 5/0092 20130101;
H04L 5/0094 20130101; H04L 5/0057 20130101; H04W 72/1294 20130101;
H04L 5/0071 20130101; H04L 5/0053 20130101; H04L 5/0055 20130101;
H04L 5/0098 20130101; H04W 72/1278 20130101; H04W 72/0413
20130101 |
Class at
Publication: |
370/329 |
International
Class: |
H04W 72/04 20060101
H04W072/04 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 14, 2009 |
AU |
2009903629 |
Claims
1. A method implemented in a wireless communication network of
configuring a downlink (DL) component carrier between one or more
linkage methods for PHICH (physical hybrid-ARQ (automatic repeat
request) indicator channel) reception on user equipment (UE), the
UE being configured for carrier aggregation, the method comprising:
(a) providing an indicator from a base station to the UE; (b)
determining, at the UE and based on a value of the indicator,
whether a PHICH carrier linkage is either dynamic or cell specific;
and upon a determination from said determining step that said PHICH
carrier linkage is dynamic, transmitting a PHICH on a DL component
carrier used for uplink (UL) grant transmission, and upon a
determination from said determining step that said PHICH carrier
linkage is cell specific, linking a DL component carrier used for
PHICH transmission to an UL component carrier used for PUSCH
transmission in a cell-specific manner.
2. The method of claim 1, wherein the indicator is a single bit in
a signal.
3. The method of claim 1, wherein the indicator is a single bit
located in an uplink (UL) grant.
4. The method of claim 1, wherein the indicator is a single bit
located in a DCI (downlink control information) format for an
uplink (UL) grant.
5. The method of claim 4, wherein if the indicator bit is
introduced in the DCI format for the UL grant, the single bit
exists in the DCI format only if a PDCCH (Physical Downlink Control
Channel) carrier indicator exists.
6. The method of claim 1, wherein the indicator is a single bit
located in higher layer signalling.
7. The method of claim 6, wherein the higher layer signalling
includes the radio resource control (RRC) signalling or medium
access control (MAC) signalling.
8. The method of claim 1, wherein, if at step (b) the PHICH carrier
linkage is determined as dynamic, the following further step is
performed: transmitting a PHICH on the DL component carrier used
for uplink (UL) grant transmission.
9. The method of claim 1, further comprising: setting, at the base
station, the PHICH carrier linkage as determined in (b).
10. A method implemented in user equipment (UE) used in a wireless
communication network, of configuring a downlink (DL) component
carrier between one or more linkage methods for PHICH (physical
hybrid-ARQ (automatic repeat request) indicator channel) reception,
the UE being configured for carrier aggregation, the method
comprising: (a) receiving an indicator from a base station; (b)
determining whether a PHICH carrier linkage is either dynamic or
cell specific, based on a value of the indicator, wherein, upon a
determination from said determining step that said PHICH carrier
linkage is dynamic, a same DL component carrier as that used for
transmission of the UL grant is used for PHICH transmission, and
wherein, upon a determination from said determining step that said
PHICH carrier linkage is cell specific, the DL component carrier
for PHICH transmission is linked to the UL component carrier used
for PUSCH transmission in a cell-specific manner.
11. The method of claim 10, wherein the indicator is a single bit
in a signal.
12. The method of claim 10, wherein the indicator is a single bit
located in an uplink (UL) grant.
13. The method of claim 10, wherein the indicator is a single bit
located in a DCI (downlink control information) format for an
uplink (UL) grant.
14. The method of claim 13, wherein if the single bit for the
indicator is introduced in the DCI format for the UL grant, the
single bit exists in the DCI format only if a PDCCH (Physical
Downlink Control Channel) carrier indicator exists.
15. The method of claim 10, wherein the indicator is a single bit
located in higher layer signalling.
16. The method of claim 15, wherein the higher layer signalling
includes the radio resource control (RRC) signalling or medium
access control (MAC) signalling.
17. The method of claim 10, wherein, if at (b) the PHICH carrier
linkage is determined as dynamic, the following further step is
performed: receiving a PHICH on the DL component carrier used for
unlink (UL) grant transmission.
18. The method of claim 10, further comprising: setting the PHICH
carrier linkage as determined in (b).
19. A method implemented in a base station used in a wireless
communication network, of configuring a downlink (DL) component
carrier between one or more linkage methods for PHICH (physical
hybrid-ARQ (automatic repeat request) indicator channel) reception
on user equipment (UE), the UE being configured for carrier
aggregation, the method comprising: providing an indicator to the
UE, wherein the UE determines whether a PHICH carrier linkage,
based on a value of the indicator, is either dynamic or cell
specific, wherein, when said PHICH carrier linkage is determined as
dynamic, a same DL component carrier as that used for transmission
of the UL grant is used for PHICH transmission, and wherein, when
said PHICH carrier linkage is determined as cell specific, the DL
component carrier for PHICH transmission is linked to the UL
component carrier used for PUSCH transmission in a cell-specific
manner.
Description
TECHNICAL FIELD
[0001] The present invention relates to wireless communications
systems, and more particularly to a method for configuring the
downlink component carrier between one or more Physical Hybrid-ARQ
Indicator Channel (PHICH) carrier linkage methods.
BACKGROUND ART
[0002] Long Term Evolution-Advanced (LTE-A) is an evolving mobile
communication standard which aims to take advantage of 3G mobile
communications devices. A feature of LTE-A is carrier aggregation
where two or more component carriers are aggregated in order to
support wider transmission bandwidths.
[0003] It is thought that carrier aggregation will be User
Equipment (UE) specific, i.e. each UE in the same cell in a mobile
communication network may have different configuration of carrier
aggregation.
[0004] If the carrier aggregation is symmetric (i.e. same number of
downlink component carriers and uplink component carriers), the
downlink (DL)/uplink (UL) component carriers are typically
associated in pairs in a cell-specific manner. However, in the case
of asymmetric carrier aggregation, more than one DL component
carriers may be associated in a cell-specific manner with a UL
component carrier if there are more DL component carriers than UL
component carriers and vice versa.
[0005] Once a UE is configured with carrier aggregation, the UE is
capable of simultaneously receiving or transmitting on all the
component carriers that are aggregated. Thus, the UE may be
scheduled over multiple component carriers simultaneously.
[0006] Typically, UE is only permitted to transmit on Physical
Uplink Shared Channel (PUSCH) on a particular UL component carrier
after it has received an UL grant. After the UE has transmitted
data on PUSCH on the UL component carrier, ACK/NACK is expected to
be transmitted from the associated eNodeB. A problem that arises is
which DL component carrier should be used for the PHICH
transmission when there are more than one DL component carriers
available.
[0007] The issue of PHICH carrier linkage is also related to the
issue of Physical Downlink Control Channel (PDCCH)-to-PUSCH linkage
currently being considered in 3GPP.
[0008] There have been attempts at two options to solve the problem
of PHICH carrier linkage, namely: (1) DL component carrier for
PHICH transmission being the same as that used for the transmission
of the UL grant; or (2) DL component carrier for PHICH transmission
being linked to the UL component carrier used for PUSCH
transmission in a cell-specific manner.
SUMMARY OF INVENTION
Technical Problem
[0009] A problem with option 1 is that it is not always beneficial
to force the PHICH transmission to be on the DL component carrier
where the UL grant was transmitted (particularly in a heterogeneous
network which is common in mobile communications networks).
Further, there is a potential further problem in that the total
PHICH resources in each component carrier are semi-statically
configured (via the Physical Broadcast Channel) and hence the PHICH
capacity cannot be adjusted dynamically. If PDCCH and the
corresponding PHICH can be scheduled on any DL component carrier
dynamically, a significant amount of PHICH resources may need to be
provisioned for each component carrier in order to prevent PHICH
blocking (where PHICH cannot be scheduled due to the lack of
resources). However, the utilization of the PHICH resources could
be low since only a relatively small number of PHICH resources
compared to the total PHICH resources available will be used at any
one time.
[0010] Another problem with option 1 is when there are two UL
grants for two different UEs transmitted on the same DL component
carrier, granting PUSCH transmissions on two separate UL component
carriers. PHICH resource collision may occur if the lowest of UL
Physical Resource Block (PRB) indices and the Demodulation
Reference Signal (DM RS) cyclic shifts for each UL component
carrier coincide. While this collision may be avoided via
assignment of different DM RS cyclic shift in the UL grants, it
also means that for each UL component carrier, one fewer UE can be
spatially multiplexed in the UL for UL Multi-User Multiple-Input
Multiple-Output (MU-MIMO) operation.
[0011] Furthermore, option 2 is not effective when PHICH needs to
be protected from a DL component carrier with high interference
(e.g. particularly in a heterogeneous network which is common in
mobile communications networks).
[0012] In light of the above, it would be desirable to provide, for
a UE that is carrier aggregation enabled, a downlink (DL) component
carrier used for Physical Hybrid-ARQ Indicator Channel (PHICH)
transmission to be configurable at the User Equipment (UE).
[0013] It will be appreciated that a reference herein to any matter
which is given as prior art is not to be taken as an admission that
that matter was, in Australia or elsewhere, known or that the
information it contains was part of the common general knowledge as
at the priority date of the claims forming part of this
specification.
Solution to Problem
[0014] With this in mind, one aspect of the present invention
provides a method of configuring the downlink component carrier
between one or more linkage methods for PHICH reception on User
Equipment (UE) over a mobile communication network, the UE
configured for carrier aggregation, including the steps of:
[0015] (a) providing an indicator;
[0016] (b) determining whether the PHICH carrier linkage should be
dynamic linkage or cell specific, based on the value of the
indicator.
[0017] Preferably, the indicator is a single bit in a signal.
Preferably, the indicator is a single bit located in the uplink
(UL) grant.
[0018] Preferably, the indicator is a single bit located in DCI
formats for the UL grant.
[0019] Preferably, the indicator bit is introduced in DCI formats
for UL grant and the indicator bit only exists in DCI formats if a
PDCCH carrier indicator also exists.
[0020] Preferably, the indicator is a single bit located in the
higher layer signalling.
[0021] Preferably, the higher layer signalling includes the Radio
Resource Control (RRC) signalling, or Medium Access Control (MAC)
signalling.
[0022] Preferably, if at step (b), the PHICH carrier linkage should
be dynamic, the method further includes the step of transmitting on
the downlink (DL) component carrier used for the UL grant
transmission.
[0023] Preferably, the method further includes the step of an
eNodeB associated with the mobile communication network setting the
PHICH carrier linkage as determined in step (b).
Advantageous Effects of Invention
[0024] Advantageously the invention enables, in the event that
carrier aggregation is configured with a particular UE, the
downlink component carrier to be used for PHICH transmission and is
configurable at the user equipment (UE) between two linkage
methods, namely a method that is based on the DL component carrier
used for the UL grant and a method that is based on cell-specific
UL/DL component carrier linkage.
[0025] In a further advantage, the present invention only incurs
minimal cost in terms of signalling to the UE (e.g., only one bit
in the DCI formats if it is explicitly signalled).
[0026] Advantageously, if the PHICH carrier indicator bit is
introduced in DCI formats for UL grant, it only needs to exist in
DCI formats with PDCCH carrier indicator and this arrangement
ensures that the total number of blind decoding attempts required
to be performed by the UE is not affected by the introduction of
the PHICH carrier indicator bit.
BRIEF DESCRIPTION OF DRAWINGS
[0027] [FIG. 1A]
[0028] FIG. 1A is a schematic diagram of a UL grant in an existing
LTE-A system.
[0029] [FIG. 1B]
[0030] FIG. 1B is a schematic diagram of a UL grant of the present
invention.
[0031] [FIG. 2]
[0032] FIG. 2 is schematic diagram of carrier aggregation having
PHICH dynamic linkage and cell-specific linkage according to the
invention.
[0033] [FIG. 3]
[0034] FIG. 3 is a flow diagram of the method of the present
invention.
DESCRIPTION OF EMBODIMENTS
[0035] The following description refers in more detail to the
various features and steps of the present invention. To facilitate
an understanding of the invention, reference is made in the
description to the accompanying drawings where the invention is
illustrated in a preferred embodiment. It is to be understood
however that the invention is not limited to the preferred
embodiment illustrated in the drawings.
[0036] Referring now to FIG. 1A, there is shown a schematic diagram
of a UL grant in an existing LTE-A system. In this case, a
sub-frame 100 includes a DCI payload 105 but does not include a
PDCCH carrier indicator field. Also shown is an alternative
sub-frame 110 which includes a DCI payload 105, but this time
includes a PDCCH carrier indicator field 115.
[0037] FIG. 1B is a schematic diagram of a UL grant of the present
invention. Also shown is a sub-frame 100 which includes a DCI
payload 105. A sub-frame 110 which includes a DCI payload 105 and a
PDCCH carrier indicator field 115 is also shown. Further included
is a PHICH carrier indicator bit 120. The PHICH carrier indicator
bit 120 only exists if the PDCCH carrier indicator field 115 also
exists in the UL grant. In particular, the present invention
introduces a single bit, namely the PHICH carrier indicator bit 120
in the UL grant or alternatively in the higher layer signalling
(e.g., radio resource control signalling) to indicate if the PHICH
carrier linkage should be based on the DL component carrier used
for the UL grant (for ease of reference referred to as dynamic
linkage) or the Cell-specific UL/DL component carrier linkage (for
ease of reference referred to as cell-specific linkage).
Advantageously, if the PHICH carrier indicator bit 120 is
introduced in DCI formats for UL grant, it only needs to exist in
DCI formats with PDCCH carrier indicator field 115 as shown in the
sub-frame 110 of FIG. 1B. Advantageously, this arrangement ensures
that the total number of blind decoding attempts required to be
performed by the UE is not affected by the introduction of the
PHICH carrier indicator bit 120.
[0038] The operation using the PHICH carrier indicator bit 120 is
as follows: for example, the cell-specific linkage can be based on
the cell-specific UL/DL component carrier pairing (according to the
default transmit receive separation or the UL-Carrier Freq
parameter in System Information Block 2 (SIB2) or be based on
high-layer signalling, such as RRC, broadcasted to all UEs in the
cell.
[0039] Preferably an eNodeB (not shown) sets the PHICH carrier
linkage to be dynamic or cell-specific according to its need. If
the PDCCH carrier indicator field 115 is configured by the eNodeB
and if the eNodeB sends an UL grant with the PDCCH carrier
indicator field 115 and the PHICH carrier indicator bit 120
indicating cell-specific linkage, the UE, upon detection of the UL
grant and the PHICH carrier indicator bit 120, shall assume the DL
component carrier for the PHICH is determined by cell-specific
linkage with the UL component carrier used for the corresponding
PUSCH transmission.
[0040] Similarly, if the eNodeB uses the PHICH carrier indicator
bit 120 to indicate the dynamic linkage to the UE, then the UE
assumes that the PHICH is to be transmitted on the DL component
carrier that was used for transmission of the UL grant.
[0041] This is best shown in FIG. 2 which is a schematic diagram of
carrier aggregation having PHICH dynamic linkage and a
cell-specific linkage according to the invention. FIG. 2 includes
two DL carrier components 200 (DL CC #0 and DL CC #1) and two UL
carrier components 205 (DL CC #0 and DL CC #1). UL CC #0 and UL
CC#1 are linked to DL CC #0 and DL CC #1 respectively by a
cell-specific linkage 220. Alternatively, UL CC #1 and DL CC #0 are
linked via dynamic linkage 215. As an example, the UL grant for UL
CC #1 is transmitted in DL CC #0. If the PHICH carrier indicator
bit 120 is set to indicate dynamic linkage, then the corresponding
PHICH is transmitted on DL CC #0. Otherwise, if cell-specific
linkage is indicated via the PHICH carrier indicator bit 120, then
the corresponding PHICH is transmitted on DL CC #1. Advantageously
the invention enables, in the event that carrier aggregation is
configured with a particular UE, the DL component carrier to be
used for PHICH transmission and is configurable at the UE between
two linkage methods, namely a method that is based on the DL
component carrier used for the UL grant and a method that is based
on cell-specific UL/DL component carrier linkage.
[0042] In a further advantage the arrangement of the present
invention exploits the advantages provided by the two methods, in
particular, the invention enables cell specific UL/DL component
carrier linkage that allows decoupling of PDCCH scheduling and
PHICH scheduling. As a result, the PDCCH scheduling across
component carriers can be dynamic and the configuration of total
PHICH resources available for each component carrier can be
relatively static. A further advantage of the present invention
enables PHICH scheduling flexibility when needed, by allowing PHICH
to be transmitted on the DL component carrier that was used for
transmission of the UL grant which can also be flexible through the
use of the PHICH carrier indicator bit 120. This is advantageous
for deployment scenarios (e.g. in heterogeneous networks) where
some DL component carriers may be experiencing high interference
and the control channels (PDCCH and PHICH) of those
interference-dominated DL component carriers need to be protected
by transmitting them on another DL component carrier with lower
interference.
[0043] A further advantage of the present invention is to provide
flexible association of UL/DL component carriers for PHICH
transmission when UE-specific asymmetric carrier aggregation is
configured in such a way that cell-specific UL/DL component carrier
linkage cannot be applied.
[0044] In a further advantage, the present invention only incurs
minimal cost in terms of signalling to the UE (e.g., only one bit
in the DCI formats if it is explicitly signalled).
[0045] FIG. 3 shows the method 300 of the present invention. At
step 305 the UE determines whether or not the DCI format for UL
grant (e.g. DCI format 0) is to contain the PDCCH carrier indicator
field 115 and the PHICH carrier indicator bit 120. This step can be
performed via higher layer signalling, such as via RRC, directly to
the UE. If at step 305 it is determined that the PDCCH carrier
indicator field 115 exists in the DCI format for UL grant, then
control moves to step 310 where, in a sub-frame n, the UE detects
and decodes UL grant with the PDCCH carrier indicator field 115 and
the PHICH carrier indicator bit 120 on a DL component carrier.
Control then moves to step 315, in a sub frame n+4, where the UE
transmits PUSCH on the UL component carrier indicated by the PDCCH
carrier indicator field 115. Control then moves to step 320 where
the UE determines if the PHICH carrier indicator bit 120 (decoded
at step 310) indicates that dynamic linkage or cell-specific
linkage should be used. If at step 320 it is determined that the
PHICH carrier indicator bit 120 indicates that dynamic linkage
should be used, control moves to step 325, in a sub-frame n+8,
where the UE detects and decodes PHICH on the same DL component
carrier as was used for the UL grant detected at step 310. The UE
identifies its PHICH resource on the DL component carrier (PHICH
group index and sequence index in the same way as release 8 of LTE)
and detailed in Section 9.1.2 of TS36.213 v8.7.0, in which the
PHICH resource is determined from lowest index Physical Resource
Block (PRB) of the uplink resource allocation and the 3-bit uplink
demodulation reference symbol (DMRS) cyclic shift associated with
the PUSCH transmission, both indicated in the PDCCH with DCI format
0 granting the PUSCH transmission.
[0046] The PHICH resource is identified by the index pair
(n.sup.group.sub.PHICH, n.sup.seq.sub.PHICH) where
n.sup.group.sub.PHICHis the PHICH group number and
n.sup.seq.sub.PHICH is the orthogonal sequence index within the
group as defined by:
n.sup.group.sub.PHICH=(I.sup.lowest.sup.--.sup.index.sub.PRB.sub.--.sub.-
RA+n.sub.DMRS)mod N.sup.group.sub.PHICH+I.sub.PHICHN.sup.group
.sub.PHICH
n.sup.seq.sub.PHICH=(.left
brkt-bot.I.sup.lowest.sup.--.sup.index.sub.PRB.sub.--.sub.RA/N.sup.group.-
sub.PHICH.right brkt-bot.+n.sub.DMRS) mod 2 N.sup.PHICH.sub.SF
where [0047] n.sub.DMRS is mapped from the cyclic shift for DMRS
field in the most recent DCI format 0 for the transport block
associated with the corresponding PUSCH transmission. For a
semi-persistently configured PUSCH transmission on subframe n in
the absence of a corresponding PDCCH with a DCI Format 0 in
subframe n-k.sub.PUSCH or a PUSCH transmission associated with a
random access response grant, n.sub.DMRS is set to zero where
k.sub.PUSCH is as defined in section 8 in TS36.212. [0048]
N.sup.PHICH.sub.SF the spreading factor size used for PHICH
modulation as described in section 6.9.1 in TS36.211. [0049]
I.sup.lowest.sup.--.sup.index.sub.PRB.sub.--.sub.RA is the lowest
PRB index in the first slot of the corresponding PUSCH transmission
[0050] N.sup.group.sub.PHICH is the number of PHICH groups
configured by higher layers as described in section 6.9 of
TS36.211,
[0050] .cndot. I PHICH = { 1 for TDD UL / DL configuration 0 with
PUSCH transmission in subframe n = 4 or 9 0 otherwise
##EQU00001##
[0051] Alternatively, if at step 320 the UE determined the PHICH
carrier indicator bit 120 indicated cell-specific linkage, control
moves to step 330 where, in a sub-frame n+8, the UE decodes the
PHICH on the DL component carrier with cell-specific association
with UL component carrier used for PUSCH transmission as determined
at step 315. The UE identifies its PHICH resource on the DL
component carrier (PHICH group index and sequence index) in the
same way as LTE release 8 as described above.
[0052] If at step 305 the UE determines it is not required to
detect UL grant with the PDCCH carrier indicator field 115 (e.g.
sub-frame 100 as shown in FIG. 1A or 1B) control moves to step 335
where, in sub-frame n, for a DL component carrier the UE detects
and decodes UL grant without the PDCCH carrier indicator field
(115) and the PHICH carrier indicator bit (120) on a DL component
carrier. Control then moves to step 340 where, in a sub-frame n+4,
the UE transmits PUSCH on the UL component carrier which is linked
to the DL component carrier in a cell-specific manner
(cell-specific being the default method). Advantageously, without
the PDCCH carrier indicator, selecting cell-specific as the default
method provides the simplest method for the UE to determine which
UL component carrier is associated with a DL component carrier.
[0053] Control then moves to step 345 where, in a sub-frame n+8,
the UE detects and decodes the PHICH on the DL component carrier
which is linked to the UL component carrier used for PUSCH
transmission in step 340 (which is the same as the DL component
carrier where the UL grant was detected in step 335). The UE
identifies its PHICH resource on the DL component carrier (PHICH
group index and sequence index) in the same way as long term
evolution release 8 as described above.
[0054] Advantageously, a single PHICH carrier indicator bit 120
efficiently allows two different methods of PHICH carrier linkage
to be configured.
[0055] Although the exemplary embodiments of the invention have
been disclosed for illustrative purposes, those skilled in the art
will appreciate that various modifications, additions and
substitutions are possible without departing from the scope of the
present invention. Therefore, the present invention is not limited
to the above-described embodiments but is defined by the following
claims.
INCORPORATION BY REFERENCE
[0056] This application is based upon and claims the benefit of
priority from Australian provisional patent application No.
2009903829, filed on Aug. 14, 2009, the disclosure of which is
incorporated herein in its entirety by reference.
INDUSTRIAL APPLICABILITY
[0057] The present invention is applicable to wireless
communications systems, and more particularly to a method for
configuring the downlink component carrier between one or more
Physical Hybrid-ARQ Indicator Channel (PHICH) carrier linkage
methods.
REFERENCE SIGNS LIST
[0058] 100, 110 SUB-FRAME
[0059] 105 DCI PAYLOAD
[0060] 115 PDCCH CARRIER INDICATOR FIELD
[0061] 120 PHICH CARRIER INDICATOR BIT
[0062] 200 DL CARRIER COMPONENT
[0063] 205 UL CARRIER COMPONENT
[0064] 215 DYNAMIC LINKAGE
[0065] 220 CELL-SPECIFIC LINKAGE
* * * * *