CN101567774B - Method and device for achieving multi-subframe joint scheduling - Google Patents
Method and device for achieving multi-subframe joint scheduling Download PDFInfo
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Abstract
The invention discloses a method for achieving multi-subframe joint scheduling, which comprises the following steps that: a receiving end receives a plurality of bound subframes, combines and demodulates all the bound subframes received before feedback time delay, and sends a hybrid automatic retransmission request (HARQ) feedback according to the combination and the demodulation result; and a base station performs retransmission scheduling on a sending terminal according to the feedback result. The invention also discloses a device for achieving the multi-subframe joint scheduling. The proposal of the invention can reduce the redundant retransmission probability in a time division duplex (TDD) system and reduce the resource waste.
Description
Technical field
The present invention relates to wireless communication technology field, particularly a kind of implementation method of multi-subframe integrated scheduling and device.
Background technology
For the uplink of wireless communication system, because be subject to the transmitting power of subscriber equipment (UE), if UE is in than rugged environment, the difficult quality guarantee of its uplink then.Under the situation of using maximum power transmission, think further to improve transmission quality, then can adopt multi-subframe integrated scheduling scheme (TTI bundling) to improve up covering power.
The essential characteristic of existing multi-subframe integrated scheduling is following:
A plurality of continuous subframes (TTI) are bound a scheduling unit (bundle); Continuous subframes in a scheduling unit is sent the different redundancy versions of a transmission block; Promptly carry out HARQ automatically and retransmit at a plurality of continuous T TI, during do not need affirmative acknowledgement (ACK)/negative response (NACK) feedback.Each scheduling unit is an independent resource, and corresponding one is mixed automatic repeat requests (HARQ) process, only needs a dispatch and a feedback signaling.Source block is carried by a TTI, and the target error block rate requirement is not very strict, and promptly the Block Error Rate of single subframe is higher relatively.
For the system of frequency division multiplexing (FDD), a kind of multi-subframe integrated scheduling scheme of the prior art is as shown in Figure 1.A HARQ retransmission time interval (RTT) comprises 8 sub-frame, and each subframe lengths is 1 millisecond, and wherein first three sub-frame is formed a scheduling unit, and this three sub-frame is with same data block re-transmitted three times.Consider the receiving terminal processing delay, receive feedback information positive response/negative response (ACK/NACK), and scheduling retransmits in view of the above to first subframe in the scheduling unit from receiving terminal in subframe 4.
The advantage of existing multi-subframe integrated scheduling scheme is not change the re-transmission timing relationship, and with the single sub-frame scheduling and when depositing, whole sub-district has only a kind of RTT relation in multiple scheduling unit size, and scheduling simply, and is and obvious to the lifting effect of system's covering performance.But there is following shortcoming in this scheme: if a plurality of redundancy versions that a plurality of subframes in the scheduling unit are carried merge the result who detects is correct data, but the demodulation result of first subframe and incorrect the time can cause unnecessary retransmission.
In addition, the LTE system supports FDD and two kinds of duplex modes of time division multiplexing (TDD).For the FDD system, up-downgoing is on frequency, to separate, and is continuous on the time domain.In order not change the re-transmission timing relationship, the HARQ feedback can only be to first subframe in the scheduling unit.The ascending-descending subframes configuration of TDD system has multiple situation.Under various time slot ratio, the time interval of the feedback moment and first subframe may change.In the existing multi-subframe integrated scheduling scheme, the HARQ feedback can cause some unnecessary retransmission always to first subframe in the scheduling unit, causes the wasting of resources.
Summary of the invention
In view of this, the objective of the invention is to, propose a kind of implementation method and device of multi-subframe integrated scheduling, reduce the redundant retransmission probability in the TDD system, reduce the wasting of resources.
The implementation method of the multi-subframe integrated scheduling that the embodiment of the invention proposes comprises:
Receiving terminal receives a plurality of subframes of binding, merges all binding subframes that receive before the demodulation feedback delay, and sends the automatic repeat requests HARQ feedback of mixing according to merging demodulation result;
The base station is carried out retransfer scheduling according to feedback result to transmitting terminal.
The embodiment of the invention proposes is used to realize that the device of multi-subframe integrated scheduling comprises:
Receiving element is used to receive a plurality of subframes of binding;
Demodulating unit is used to merge all binding subframes of receiving before the demodulation feedback delay;
Feedback unit is used for that all results that bind subframes send the HARQ feedback according to said demodulating unit merges that demodulation receives.
Can find out from above technical scheme; In multi-subframe integrated scheduling mechanism; What the HARQ feedback was directed against is the demodulation result of feeding back all binding subframes that constantly can reflect; Then very big maybe on avoided actual transmissions success but the situation of feeding back unsuccessful information, thereby reduce the redundant retransmission probability in the TDD system, reduce the wasting of resources.In addition, the present invention program adopts and the identical re-transmission timing relationship of single sub-frame scheduling, can not increase the complexity of scheduling.
Description of drawings
Fig. 1 is the realization sketch map of a kind of multi-subframe integrated scheduling scheme of the prior art;
Fig. 2 is the frame structure sketch map of LTE TDD system;
Fig. 3 realizes the flow chart of multi-subframe integrated scheduling for the embodiment of the invention;
Fig. 4 is the realization sketch map of the multi-subframe integrated scheduling scheme of the embodiment of the invention;
Fig. 5 is the multi-subframe integrated scheduling implement device sketch map of another embodiment of the present invention.
Embodiment
The present invention is directed to the time slot configuration of TDD and the characteristics of feedback and re-transmission timing relationship, in multi-subframe integrated scheduling, continue to use the re-transmission timing relationship of single sub-frame scheduling, all demodulation result of scheduling unit that the HARQ feedback then can reflect according to the feedback moment.The present invention program can greatly reduce the actual transmissions success but the situation of feeding back unsuccessful information with respect to the existing way of feeding back according to the demodulation result of first subframe.
For reaching preferable implementation result, embodiment of the invention scheme need satisfy following principle:
1, do not change the re-transmission timing relationship, promptly do not change HARQ RTT value;
2, guarantee basic feedback delay, what for example reflect among Fig. 1 is 3ms from receiving the minimal time delay that the data to data processing finishes and transmission HARQ feeds back.
Before introducing the present invention program in detail, the frame structure of LTE TDD system is carried out brief account.
A kind of typical frame structure of LTE TDD system is as shown in Figure 2.Each radio frames is made up of two fields (half-frame), and each field length is 5ms.Each field be divided into the conventional time slot that 8 length are 0.5ms (Time Slot, TS) with 1 special area that length is 1ms, per two conventional time slots are composed of a sub-frame, wherein the i sub-frame is made up of with 2i+1 time slot 2i.This special area is made up of descending pilot frequency time slot (DwPTS), protection time slot (GP) and uplink pilot time slot (UpPTS), and the length of DwPTS and UpPTS is configurable, and the total length of DwPTS, GP and UpPTS equals 1ms.Subframe 1 comprises DwPTS, GP and UpPTS with subframe 6.Wherein, subframe 0 is reserved as downlink transfer forever with subframe 5 and DwPTS.LTE TDD system supports the switching cycle of 5ms and 10ms.
Standard confirms that the time slot ratio configuration of supporting is as shown in table 1 at present.
Table 1
Wherein, alphabetical D representes descending time slot, and letter U is represented ascending time slot, and alphabetical S representes special time slot.Allocation plan 0,1,2 is the time slot transfer point cycle of 5ms, and allocation plan 3-6 is the time slot transfer point cycle of 10ms.
The concrete realization flow of the multi-subframe integrated scheduling of the embodiment of the invention is as shown in Figure 3, comprises the steps:
Step 301: receiving terminal receives a plurality of subframes of binding;
Step 302: merge all binding subframes that demodulation receives before feedback delay; Usually, feedback delay is exactly the minimum treat time delay apart from the feedback channel time location, and by present working hypothesis, this minimum treat time delay is 3ms.
Step 303: receiving terminal sends the HARQ feedback according to merging demodulation result, if merge demodulation result for successfully receiving data block, then sends ACK; If merge demodulation result for taking defeat, then send NACK;
Step 304: the base station retransmits according to feedback result scheduling transmitting terminal, if feedback result is that NACK then dispatches the data block that re-transmission was last time sent, thinks that then data send successfully if feedback result is ACK, does not dispatch re-transmission.
Fig. 4 realizes the sketch map of multi-subframe integrated scheduling for embodiment of the invention scheme.Time slot ratio among Fig. 4 is configured to descending sub frame (DL): special subframe (ST): sub-frame of uplink (UL)=6: 1: 3, process have 3.In the content that feedback channel sends, the alphabetical P among P1, P2, the P3 representes to feed back, 1,2,3 each process of correspondence of numeral, and in the present embodiment, the content of feedback channel is to be sent by the subscriber equipment as receiving terminal.In the content that scheduling channel sends, the alphabetical G among G1, G2, the G3 representes resource allocation, and numeral also is corresponding each process, and in the present embodiment, the content of scheduling channel is sent by the base station.In initial transmission phase, three continuous sub-frame of uplink constitute jointly scheduling unit, send with a upstream data.In feedback and retransfer scheduling stage, all subframes that receiving terminal is received before with processing delay merge demodulation, according to merging demodulation result transmission feedback information ACK/NACK; In the re-transmission stage, the base station is carried out retransfer scheduling according to feedback information to transmitting terminal.
Fig. 5 shows the multi-subframe integrated scheduling implement device of another embodiment of the present invention, and this device is arranged in the base station, comprising:
Receiving element 501 is used to receive a plurality of subframes of binding;
The present invention program's key is that in multi-subframe integrated scheduling mechanism, employing is dispatched identical re-transmission timing relationship with single sub-frame, and what the HARQ feedback was directed against is the demodulation result of feeding back all binding subframes that constantly can reflect.Owing to reflect the joint demodulation result of a plurality of subframes during feedback; Then very big maybe on avoided being demodulated to merit but the situation of feeding back unsuccessful information, the present invention program can cover in the raising system, when not increasing the scheduling complexity; Reduce the redundant retransmission probability in the TDD system, reduce the wasting of resources.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. the implementation method of a multi-subframe integrated scheduling; It is characterized in that; This method is applied to LTE TDD system, adopts and the identical re-transmission timing relationship of single sub-frame scheduling, and guarantees basic feedback delay; Said feedback delay is that the data to data processing finishes and the time delay of transmission HARQ feedback from receiving, and comprising:
Transmitting terminal is bound a scheduling unit with a plurality of continuous subframes, and the continuous subframes in a scheduling unit is sent the different redundancy versions of a transmission block;
Receiving terminal receives a plurality of subframes of binding, merges all binding subframes that receive before the demodulation feedback delay, and sends the automatic repeat requests HARQ feedback of mixing according to merging demodulation result;
The base station is carried out retransfer scheduling according to feedback result to transmitting terminal.
2. the implementation method of multi-subframe integrated scheduling according to claim 1 is characterized in that, said feedback delay is the minimum treat time delay apart from the feedback channel time location.
3. the implementation method of multi-subframe integrated scheduling according to claim 1 is characterized in that, the said feedback according to merging demodulation result transmission HARQ comprises: if merge demodulation result for successfully receiving data block, then send positive response ACK; If merge demodulation result for taking defeat, then send negative response NACK.
4. the implementation method of multi-subframe integrated scheduling according to claim 3 is characterized in that, said base station is carried out retransfer scheduling according to feedback result to transmitting terminal and comprised:
The base station is carried out retransfer scheduling according to feedback result to transmitting terminal, if feedback result is that NACK then dispatches the data block that re-transmission was last time sent.
5. device that is used to realize multi-subframe integrated scheduling; It is characterized in that; This device is applied to LTE TDD system, adopts and the identical re-transmission timing relationship of single sub-frame scheduling, and guarantees basic feedback delay; Said feedback delay is that the data to data processing finishes and the time delay of transmission HARQ feedback from receiving, and comprising:
Receiving element is used to receive a plurality of subframes of binding; A plurality of subframes of said binding constitute a scheduling unit, the different redundancy versions of the transmission block of a plurality of subframe transmission in a scheduling unit;
Demodulating unit is used to merge all binding subframes of receiving before the demodulation feedback delay;
Feedback unit is used for that all results that bind subframes send the HARQ feedback according to said demodulating unit merges that demodulation receives.
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| CN102420683B (en) * | 2010-09-26 | 2015-10-21 | 中兴通讯股份有限公司 | The defining method of ascending HARQ course combination and device |
| CN103460740B (en) * | 2011-02-07 | 2017-10-10 | 交互数字专利控股公司 | The method and apparatus of operation supplement cell in licensed spectrum is exempted from |
| CN105790895B (en) * | 2012-03-09 | 2019-04-19 | 电信科学技术研究院 | A kind of implementation method and device of HARQ feedback |
| CN103368706A (en) * | 2012-03-26 | 2013-10-23 | 中兴通讯股份有限公司 | Transmission method, device and system for hybrid automatic repeat request |
| CN110266431B (en) * | 2012-05-11 | 2021-10-15 | 华为技术有限公司 | Data transmission method and device |
| CN103733584A (en) * | 2012-05-11 | 2014-04-16 | 华为技术有限公司 | Data transmission method and device |
| WO2014047788A1 (en) * | 2012-09-25 | 2014-04-03 | Nec(China) Co., Ltd. | Method and apparatus for enhancing coverage |
| CN103795505A (en) * | 2012-11-02 | 2014-05-14 | 电信科学技术研究院 | Data transmission method, system and device |
| CN103873214B (en) * | 2012-12-14 | 2017-12-19 | 电信科学技术研究院 | A kind of data transmission method and device |
| WO2015042957A1 (en) * | 2013-09-30 | 2015-04-02 | 华为技术有限公司 | Channel test method, terminal test instrument, and user equipment |
| CN105637782B (en) * | 2013-10-17 | 2019-02-15 | Lg电子株式会社 | Method for wireless communications and equipment |
| CN104579591B (en) * | 2013-10-18 | 2017-11-10 | 普天信息技术有限公司 | The feedback resource distribution method and system of the descending more subframe schedulings of TDD |
| US10772092B2 (en) | 2013-12-23 | 2020-09-08 | Qualcomm Incorporated | Mixed numerology OFDM design |
| CN104754752B (en) * | 2013-12-25 | 2019-01-25 | 中国电信股份有限公司 | More subframe scheduling methods and system |
| CN105323861B (en) * | 2014-07-15 | 2019-05-14 | 中国移动通信集团公司 | A kind of method for sending information, equipment and system |
| CN107733580B (en) * | 2016-08-12 | 2020-03-03 | 电信科学技术研究院 | Transmission method, device and system of feedback information |
| CN107682128B (en) * | 2017-08-31 | 2020-06-05 | 宇龙计算机通信科技(深圳)有限公司 | Data transmission method, device, equipment and storage medium |
| CN114503485B (en) * | 2019-09-29 | 2024-03-29 | 富士通株式会社 | Phase tracking reference signal transmission method and device |
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