CN101136889A - Feedback channel scheduling method and apparatus for multi-carrier wireless communication - Google Patents
Feedback channel scheduling method and apparatus for multi-carrier wireless communication Download PDFInfo
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Abstract
When user terminal uses shared indication channel to carry out feedback, the method unites sub code channels located at same time slot and belonged to same code channel into corresponding parent code channel. The said feedback information is transferred in the united code channel. The device includes following modules: recognition module in use for determining whether two sub code channels belong to same parent code channel, and the determined result is sent to the channel process module; based on determined result by the recognition module, the channel process module unites sub code channels belonged to same code channel into corresponding parent code channel. Under certain condition, the invention unites up-going feedback channel so as to reduce number of enabled code channels and lower emission peak average ratio of terminal, and reduce complexity of realization.
Description
Technical field
The present invention relates to wireless communication technology field, be specifically related to the feedback channel scheduling method and the device of multi-carrier wireless communication.
Background technology
In order to improve user's peak-data transmission rate and throughput of system, 3GPP standardization body has introduced high speed downlink packet access (HSDPA, High Speed Downlink Package Access) technology at the asymmetric demand of up-downgoing data service.HSDPA has adopted high order modulation, by Adaptive Modulation and Coding (AMC, Adaptive Modulation Code), mix technology such as automatic request retransmission (HARQ, Hybrid Automatic Repeat Request) and fast dispatch and reach the purpose that improves throughput of system.
With reference to Fig. 1, for example, in the TD-SCDMA system, in order to support HSDPA, need to introduce a new transmission channel: high speed downlink shared channel HS-DSCH (High Speed DownlinkShared Channel), be used to carry each user's high level data, its corresponding physical channel is high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH, High Speed-Physical Downlink SharedChannel).In order to realize fast dispatch, introduce shared control channel HS-SCCH (Shared ControlChannel for HS-DSCH) and shared indicating channel HS-SICH (Shared InformationChannel for HS-DSCH), be used for the mutual of base station and user terminal UE control information.Wherein, HS-SCCH is the physical channel that is used for bearing downlink control signaling, can be shared by a plurality of user time-sharings.Descending control signaling mainly comprises scheduling indication information (indicating which user to be scheduled), (user's time slot and code channel distributed in indication to resource indication information, the modulation system that adopts, size of transmission block etc.) and HARQ process relevant information (indicate the HARO process id that current transmission uses and whether be the data block of re-transmission).HS-SICH is used to carry upstream control signaling, HS-SICH usually and HS-SCCH occur in pairs, promptly for each bar HS-SCCH, all correspondingly have a HS-SICH associated.Upstream control signaling mainly comprises transmission block size and the modulation system that UE recommends, for the feedback (ACK/NACK) of the data block correctness that receives etc.
In single carrier HSDPA, user's downlink data can only send on a carrier wave.System is each HS-SCCH set of terminal configuration of using HSDPA, and each set comprises one or more HS-SCCH, and different terminals can dispose identical HS-SCCH set.Any one Transmission Time Interval (TTI, Transmission Time Interval), every HS-SCCH can only carry a user's control information (promptly can only be used to dispatch a user) at most, terminal is in service process, need every HS-SCCH in the real-time listening HS-SCCH set, in case detect carried one's own schedule information on certain bar HS-SCCH after, the HS-PDSCH resource location of its indication of arriving receives data, then with HS-SICH that HS-SCCH is associated on the feeding back uplink control information.In order to reduce the power consumption of terminal monitoring HS-SCCH, the existing standard regulation, the base station is when dispatching certain terminal continuously, must use same HS-SCCH to carry its control information, from the angle of terminal, if detect certain bar HS-SCCH it is dispatched, so next TTI at certain TTI, it only needs to monitor same HS-SCCH, and needn't monitor other HS-SCCH in the set.HS-SCCH, HS-PDSCH and HS-SICH are positioned at same carrier wave, and the timing relationship between them defines in relevant criterion.
In order further to improve peak rate, adopt multi-carrier HSDPA, promptly on a plurality of carrier waves, send data simultaneously to same terminal, this also requires terminal to possess the ability of downlink data receiving on a plurality of carrier waves simultaneously.In multi-carrier HSDPA, need be a plurality of HS-SCCH set of terminal configuration, the resource that the HS-SCCH in each HS-SCCH set is responsible for dispatching a carrier wave.Correspondingly, up also will have a plurality of HS-SICH set related with it.The use of any HS-SCCH set is identical with the situation of single carrier HSDPA with monitor method.According to the difference of terminal capability, be used to dispatch different carrier resource HS-SCCH set and can be configured in same carrier wave or different carrier, standard code HS-SCCH and HS-SICH associated therewith are on same carrier wave.Like this, if all HS-SCCH set all are configured in same carrier wave, its corresponding HS-SICH is also at same carrier wave, and terminal only need send on a carrier wave at up direction, does not need to support pilosity, has reduced its implementation complexity.
For peak-to-average force ratio and the implementation complexity that reduces the terminal transmitted power, existing standard stipulates that the code channel number that activates simultaneously in any one ascending time slot of same terminal can not surpass predetermined thresholding N.The value of N is 2 at present, means that the same ascending time slot of same user allows to activate two code channels at most.Therefore, stipulate according to existing standard, consider the typical case that uplink and downlink timeslot ratio was configured to 2: 4, for a terminal of supporting 6 carrier waves, its uplink feedback channel HS-SICH concentrates on a carrier wave, and be distributed in two ascending time slots, so average each ascending time slot will allow to intensify the data feedback that 3 code channels could be supported 6 carrier waves simultaneously at least, and this obviously can't satisfy the requirement that same ascending time slot only allows 2 activated code channels.For this reason, having proposed two kinds of basic schemes according to prior art is used to address the above problem:
Scheme 1:
Revise existing standard, the expansion ascending time slot allows the code channel number that activates simultaneously, for example to 6 carrier terminals, this restriction is expanded to 4, is configured to provide the uplink feedback information of 6 carrier waves at 2: 4 o'clock to support time slot ratio.Correspondingly, need the more up activated code channel of terminal support, this radio-frequency (RF) index to terminal is had higher requirement, and has strengthened implementation complexity, has improved the manufacturing cost of terminal.
Scheme 2:
At multi-carrier terminal, change the structure of uplink feedback channel HS-SICH, use the code channel of low spreading factors more to carry the uplink feedback information of a plurality of carrier waves.In the existing system, HS-SICH uses a spreading factor (SF, Spreading Factor) is 16 code channels, only carry the feedback information of a carrier wave, by revising the feedback information that the code channel that will use a SF=8 carries two carrier waves, the code channel of a SF=4 carries the feedback information of three carrier waves, and the code channel of a SF=2 carries the feedback information of 6 carrier waves.Though this scheme need not expanded code channel, but use a uplink code channel to carry the feedback information of a plurality of carrier waves simply, destroyed the incidence relation between HS-SCCH and the HS-SICH, realize complicated, can cause the waste of ascending resource in addition, for example, when this scheme is carried the uplink feedback information of 5 carrier waves, must use a SF is 2 code channel, and the actual feedback information that can carry 8 carrier waves of this code channel, this has been equivalent to cause the wasting of resources of the code channel of 3 SF=16, and this influence for the limited TDD system of code channel is bigger.
Summary of the invention
Given this, the technical problem to be solved in the present invention provides a kind of feedback channel scheduling method and device of multi-carrier wireless communication.
Feedback channel scheduling method according to a kind of multi-carrier wireless communication provided by the invention comprises:
When user terminal use to be shared indicating channel and fed back, the subcode road that will be positioned at same time slot and belong to same code channel was merged into female code channel of its correspondence, and on the code channel after the merging transmitting feedback information.
Female code channel that the described subcode road that will belong to same code channel is merged into its correspondence specifically comprises:
When two spreading factors that are positioned at same time slot are 2
N+1Shared indicating channel be that spreading factor is 2
nThe subcode road of code channel, it is 2 that these two shared indicating channels are merged into this spreading factor
nFemale code channel, the integer of n 〉=0 wherein.
Ground preferably, judge that according to following step two subcode roads belong to same female code channel:
Each subcode is divided into two parts from the centre, if the first half of two subcodes is identical, then these two subcodes belong to same female sign indicating number.
Preferably, when the activated code channel number of sharing indicating channel place time slot during, then stop code channel judgement and merging process, and adopt original shared indicating channel transmitting feedback information less than predetermined threshold value.
When ground preferably, base station selected shared control channel, preferentially make the shared indicating channel that is associated with the shared control channel of selecting belong to the subcode road of same spreading code.
Ground preferably, when dispatching a plurality of user simultaneously, the base station is preferably the user terminal selecting shared control channel that distributes a plurality of carrier waves, and the carrier number that user terminal distributed is many more, and its priority is high more.
Ground preferably when many shared indicating channels merge to a code channel transmission, sorts to information according to the code channel numbering of former shared indicating channel, so that the information of different sharing indicating channel is distinguished in the base station.
The criterion whether base station two shared indicating channels of judgement can merge into same code channel is identical with terminal.
Ground preferably before carrying out the code channel merging, judges that whether ascending time slot activated code channel number is less than the threshold value that allows, if described activated code channel number is less than the threshold value that allows, then use original shared indicating channel to feed back, otherwise, carry out the code channel union operation.
A kind of feedback channel scheduling device of multi-carrier wireless communication also is provided according to the present invention, comprises:
Identification module is used to judge whether two subcode roads belong to same female code channel;
Channel processing module, according to the judged result of identification module, the subcode road that will belong to same code channel is merged into female code channel of its correspondence.
Described identification module judges that according to following steps two subcode roads belong to same female code channel:
Each subcode is divided into two parts from the centre, if the first half of two subcodes is identical, then these two subcodes belong to same female sign indicating number.
Preferably, the described channel processing module subcode road that will belong to same code channel as follows is merged into female code channel of its correspondence:
When two spreading factors that are positioned at same time slot are 2
N+1Shared indicating channel be that spreading factor is 2
nThe subcode road of code channel, it is 2 that these two shared indicating channels are merged into this spreading factor
nFemale code channel, the integer of n 〉=O wherein.
Ground preferably, this device also comprises:
Whether judge module is used to judge ascending time slot activated code channel number less than the threshold value that allows, if described activated code channel number then uses original shared indicating channel to feed back less than the threshold value that allows, otherwise, carry out the code channel union operation.
In sum, the present invention is by merging under certain condition uplink feedback channel HS-SICH, transmitting feedback information on the code channel after the merging, reduced the activated code channel number of ascending time slot, and inherited the incidence relation between the HS-SCCH and HS-SICH in the existing standard, thereby reduce the emission peak-to-average force ratio of terminal, reduce its implementation complexity.
Description of drawings
Fig. 1 is the sub-district part configuration diagram of WCDMA or TD-SCDMA system;
Fig. 2 is a spread spectrum code tree schematic diagram;
Fig. 3 is a feedback channel scheduling method flow chart according to a particular embodiment of the invention;
Fig. 4 is the formation schematic diagram of feedback channel scheduling device according to a particular embodiment of the invention.
Embodiment
Core concept of the present invention is, when terminal need be fed back the information of a plurality of carrier waves simultaneously, if two spreading factor SF=2
N+1The HS-SICH code channel belong to same spreading factor SF=2
nThe subcode road, then the information on these two HS-SICH code channels is merged to a SF=2
nCode channel on send the integer of n 〉=0 wherein.Thereby make full use of uplink channel resources, and the incidence relation between shared control channel HS-SCCH and the shared indicating channel HS-SICH, still can determine according to existing implementation, two shared indicating channel HS-SICH that belong to same spreading code subcode both can carry two users' feedback information respectively, also can carry same user's feedback information by the mode that merges.
For making principle of the present invention, characteristic and advantage clearer, be that example is described in detail specific embodiments of the present invention with the HSDPA system below.
At first, the structure to spreading code describes.Be illustrated in figure 2 as spread spectrum code tree schematic diagram.In the figure, subscript Q represents the spreading factor of this spreading code, and subscript k represents the sequence number of spreading code, for example, and c
(k=1) Q=4The expression spreading factor is 4, is numbered 1 spreading code.Each spreading factor is 2
nSpreading code can by repeat and upset to construct two spreading factors be 2
N+1Spreading code.Spreading code 1,1 (c for example
(k=1) Q=2) by repeating to construct first spreading code 1,1,1,1 (c
(k=1) Q=4), can construct another spreading code 1,1 ,-1 ,-1 (c by repeating to add upset
(k=2) Q=4).The new spreading code that is constructed by same spreading code is called the subcode of former spreading code, and former spreading code is called female sign indicating number.
With reference to Fig. 3, feedback channel using method according to a particular embodiment of the invention specifically comprises:
Step S01, network side determine that for terminal the shared control channel HS-SCCH of its monitoring gathers and the shared indicating channel HS-SICH related with each shared control channel HS-SCCH when setting up HSDPA service connection, and by high-level signaling notice terminal.
Step S02, the base station is the shared indicating channel HS-SCCH that scheduled terminals selects this scheduling to use.Can share indicating channel HS-SICH when making terminal carry out up feedback merges, to reduce the activation number of uplink code channel, the associated shared indicating channel HS-SICH of shared control channel HS-SCCH that should make as far as possible and select during base station selected shared control channel HS-SCCH belongs to the subcode road of the spreading code of same spreading factor, for example, the resource of 2 carrier waves that the base station has been terminal distribution, need select two from three HS-SCCH and carry its control information, the HS-SICH code channel numbering that is associated with these three HS-SCCH channels is respectively: c
(k=1) Q=16, c
(k=2) Q=16And c
(k=5) Q=16, wherein, c
(k=1) Q=16, c
(k=2) Q=16Be the subcode that belongs to same female sign indicating number, at this moment, the base station should preferentially be selected and c
(k=1) Q=16, c
(k=2) Q=16Two HS-SCCH that are associated.
When having dispatched a plurality of user terminal simultaneously, the base station should be preferably the user terminal selecting HS-SCCH that distributes a plurality of carrier waves, and the carrier number that user terminal distributed is many more, and its priority is high more.The base station sends control information to terminal at selected HS-SCCH, and sends data on Traffic Channel.
Step S03, terminal monitoring HS-SCCH, if find to have carried one's own schedule information on the HS-SCCH, then the resource location in its indication receives data.
Step S04, the definite HS-SICH that is associated with the HS-SCCH of this scheduling of terminal, and adjudicate two HS-SICH and whether can merge into same code channel, specific as follows:
Same code channel (i.e. Suo Shu female code channel) just can be merged in the two subcode roads that belong to same female code channel, concrete judgement: each subcode is divided into two parts from the centre, if the first half of two subcodes is identical, then these two subcodes belong to same female sign indicating number.For example 1,1,1,1 and 1,1 ,-1 ,-1 first half all is 1,1, therefore belongs to the subcode of same code channel.Correspondingly, same female code channel just can be merged in this two subcodes road.
For example, certain two spreading factor of finding to be positioned at same ascending time slot as UE be 16 HS-SICH to belong to same spreading factor be 8 code channel, just these two HS-SICH are merged into this spreading factor and are 8 code channel (female code channel).
Further, to through the HS-SICH after once merging, if finding two spreading factors is that to belong to same spreading factor be 4 code channel for 8 code channel, then can further be that 8 code channel merges with these two spreading factors, the rest may be inferred, be positioned at the subcode that same time slot and the identical code channel of spreading factor do not belong to same spreading code up to any two, then the code channel merging process finishes.
Step S05, terminal is used through the HS-SICH after the step S04 processing to the base station feedback uplink information.If exist many HS-SICH to merge to the situation of a code channel transmission, need putting in order of the different HS-SICH of agreement, so that the information of different HS-SICH can be distinguished in the base station.
The present invention suggestion is that the value of subscript k sorts according to the numbering of HS-SICH code channel before merging.For example press k rank order from small to large.
Step S06, the base station is according to the employed criterion of terminal, be among the step s04, the decision rule that terminal is used, judge whether terminal has carried out the HS-SICH merging, for having carried out the HS-SICH that code channel merges, be from receiving feedback information on the code channel after merging, and put in order according to the information of prior agreement and to parse every information that HS-SICH is entrained.
In addition, another embodiment of the present invention is as follows:
The step S11 to S13 of this programme is identical with step S01 to S03 in the aforementioned schemes 1.
Whether step S14, UE judge earlier its ascending time slot activated code channel number less than the threshold value that allows, if less than the threshold value that allows, then do not carry out the operation of code channel concurrent sentencing, directly use original HS-SICH to feed back.
Be not less than the threshold value of permission when described ascending time slot activated code channel number, then carrying out relevant code track concurrent sentencing and code channel merges, promptly whether can merge into same code channel according to two HS-SICH of preceding method judgement, and in the time can merging, carry out corresponding union operation, all be no more than the restriction of permission, then arrest of judgement and merging process up to the activated code channel number of all HS-SICH place ascending time slots.
Processing procedure for the feedback channel transmitted information that has carried out the code channel merging is identical with preceding method, does not repeat them here.
In addition, also provide feedback channel scheduling device in a kind of multi-carrier wireless communications system according to the present invention, with reference to Fig. 4, this device comprises:
Identification module is used to judge whether two subcode roads belong to same female code channel, and the result is sent to channel processing module;
Channel processing module, according to the result of judge module, the subcode road that will belong to same code channel is merged into female code channel of its correspondence.
Described identification module judges that according to following steps two subcode roads belong to same female code channel:
Each subcode is divided into two parts from the centre, if the first half of two subcodes is identical, then these two subcodes belong to same female sign indicating number.
The subcode road that described channel processing module will belong to same code channel as follows is merged into female code channel of its correspondence:
When two spreading factors that are positioned at same time slot are 2
N+1Shared indicating channel be that spreading factor is 2
nThe subcode road of code channel, it is 2 that these two shared indicating channels are merged into this spreading factor
nFemale code channel, the integer of n 〉=0 wherein.
This device also comprises:
Whether judge module is used to judge ascending time slot activated code channel number less than the threshold value that allows, if described activated code channel number then uses original shared indicating channel to feed back less than the threshold value that allows, otherwise, carry out the code channel union operation.
The above is the preferred embodiments of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (13)
1. the feedback channel scheduling method of a multi-carrier wireless communication is characterized in that, comprising:
When user terminal use to be shared indicating channel and fed back, the subcode road that will be positioned at same time slot and belong to same code channel was merged into female code channel of its correspondence, and on the code channel after the merging transmitting feedback information.
2. feedback channel scheduling method as claimed in claim 1 is characterized in that, female code channel that the described subcode road that will belong to same code channel is merged into its correspondence specifically comprises:
When two spreading factors that are positioned at same time slot are 2
N+1Shared indicating channel be that spreading factor is 2
nThe subcode road of code channel, it is 2 that these two shared indicating channels are merged into this spreading factor
nFemale code channel, the integer of n 〉=0 wherein.
3. feedback channel scheduling method as claimed in claim 1 is characterized in that, judges that according to following step two subcode roads belong to same female code channel:
Each subcode is divided into two parts from the centre, if the first half of two subcodes is identical, then these two subcodes belong to same female sign indicating number.
4. feedback channel scheduling method as claimed in claim 1 or 2 is characterized in that, further comprises:
When the activated code channel number of sharing indicating channel place time slot during, then stop code channel judgement and merging process, and adopt original shared indicating channel transmitting feedback information less than predetermined threshold value.
5. feedback channel scheduling method as claimed in claim 1 is characterized in that, further comprises:
During base station selected shared control channel, preferentially make the shared indicating channel that is associated with the shared control channel of selecting belong to the subcode road of same spreading code.
6. feedback channel scheduling method as claimed in claim 1 is characterized in that, further comprises:
When dispatching a plurality of user simultaneously, the base station is preferably the user terminal selecting shared control channel that distributes a plurality of carrier waves, and the carrier number that user terminal distributed is many more, and its priority is high more.
7. feedback channel scheduling method as claimed in claim 1 is characterized in that, further comprises:
When many shared indicating channels merge to the transmission of code channel, according to the code channel numbering of former shared indicating channel information is sorted, so that the information of different sharing indicating channel is distinguished in the base station.
8. feedback channel scheduling method as claimed in claim 1 is characterized in that, the criterion whether base station two shared indicating channels of judgement can merge into same code channel is identical with terminal.
9. feedback channel scheduling method as claimed in claim 1, it is characterized in that, before carrying out the code channel merging, judge that whether ascending time slot activated code channel number is less than the threshold value that allows, if described activated code channel number is less than the threshold value that allows, then use original shared indicating channel to feed back, otherwise, carry out the code channel union operation.
10. the feedback channel scheduling device of a multi-carrier wireless communication is characterized in that, comprising:
Identification module is used to judge whether two subcode roads belong to same female code channel;
Channel processing module, according to the judged result of identification module, the subcode road that will belong to same code channel is merged into female code channel of its correspondence.
11. feedback channel scheduling device as claimed in claim 10 is characterized in that, described identification module judges that according to following steps two subcode roads belong to same female code channel:
Each subcode is divided into two parts from the centre, if the first half of two subcodes is identical, then these two subcodes belong to same female sign indicating number.
12. feedback channel scheduling device as claimed in claim 10 is characterized in that,
The subcode road that described channel processing module will belong to same code channel as follows is merged into female code channel of its correspondence:
When two spreading factors that are positioned at same time slot are 2
N+1Shared indicating channel be that spreading factor is 2
nThe subcode road of code channel, it is 2 that these two shared indicating channels are merged into this spreading factor
nFemale code channel, the integer of n 〉=0 wherein.
13. feedback channel scheduling device as claimed in claim 10 is characterized in that, also comprises:
Whether judge module is used to judge ascending time slot activated code channel number less than the threshold value that allows, if described activated code channel number then uses original shared indicating channel to feed back less than the threshold value that allows, otherwise, carry out the code channel union operation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111890A (en) * | 2011-02-22 | 2011-06-29 | 华为技术有限公司 | Priority regulation method and relative equipment |
| CN102752013A (en) * | 2012-06-21 | 2012-10-24 | 华为技术有限公司 | Activation code channel detection method and device |
| CN103378895A (en) * | 2012-04-30 | 2013-10-30 | 马维尔国际有限公司 | Transmit power control method and apparatus |
-
2006
- 2006-08-30 CN CNA2006101126977A patent/CN101136889A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111890A (en) * | 2011-02-22 | 2011-06-29 | 华为技术有限公司 | Priority regulation method and relative equipment |
| CN102111890B (en) * | 2011-02-22 | 2013-12-04 | 华为技术有限公司 | Priority regulation method and relative equipment |
| CN103378895A (en) * | 2012-04-30 | 2013-10-30 | 马维尔国际有限公司 | Transmit power control method and apparatus |
| CN103378895B (en) * | 2012-04-30 | 2017-12-19 | 马维尔国际有限公司 | Transmitted power control method and device |
| CN102752013A (en) * | 2012-06-21 | 2012-10-24 | 华为技术有限公司 | Activation code channel detection method and device |
| CN102752013B (en) * | 2012-06-21 | 2014-09-03 | 华为技术有限公司 | Activation code channel detection method and device |
| US9214982B2 (en) | 2012-06-21 | 2015-12-15 | Huawei Technologies Co., Ltd. | Activated code channel detection method and device |
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