CN101383685A - Downlink hybrid automatic retransmission method, system and apparatus - Google Patents
Downlink hybrid automatic retransmission method, system and apparatus Download PDFInfo
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Abstract
The invention discloses a method of down mixing self-retransmission, which comprises: a relay station (RS) and a mobile station (MS) respectively receive down data subframes which are sent to the MS by a base station (BS), and respectively return respective response showing the right receiving or response showing the wrong receiving to the BS; if the RS right receives the down data subframes, the RS buffers the down data subframes; if the up response of the BS returned by the MS is the response showing the right receiving, the RS releases the down data subframes buffered by the RS. The invention also discloses a system of down mixing self-retransmission and a RS. After the RS and the MS right receive the down data subframes sent by the MS by using the invention, the RS can fast and accurately release the data subframes buffered by the RS, and the capacity and the performance of the RS are improved.
Description
Technical field
The present invention relates to the communication technology, be specifically related to a kind of method, system and device of down mixing self-retransmission.
Background technology
In traditional cellular network, base station (BS, Base Station) (MS, MobileStation) wireless connections between are direct wireless connections, just adopt the notion of " single-hop " with travelling carriage.Yet the planning stage that covers in the base station is difficult to avoid landform, ground object may cause shadow fading (shadow fading) effect of signal in the subregion usually, therefore need utilize relay system to improve the covering of signal.Relay station (RS, Relay Station) at first receives the signal that sends from base station/user side, then again signal is transferred to user side/base station.Suitable placement RS can improve the covering of signal, can realize the regeneration of signal simultaneously when the relaying forward signal, and working along both lines to make the received signal quality of user side significantly improve.
Simultaneously, become and multipath fading when having, therefore higher bit error rate is arranged owing to wireless mobile channel.In order to ensure service quality, generally can adopt error control method in data link layer.It is a kind of feedback retransmission mechanism of bottom that mixing wherein retransmits (HARQ, Hybrid Automatic Repeat Request) technology automatically, and HARQ can retransmit in physical layer.Transmitting terminal adds cyclic redundancy check (CRC) (CRC with the data block that needs send, Cyclic Redundancy Check) data, through after the Channel Transmission, receiving terminal is decoded to data block, and data block is carried out CRC calculate, can whether correctly be received by the judgment data piece according to result of calculation.Then, receiving terminal can feed back accepting state to transmitting terminal in the moment of appointment, and transmitting terminal determines whether data block is retransmitted according to the state information of receiving terminal feedback, if the receiving terminal feedback is to receive correct (ack), then transmitting terminal begins to send new data; If the receiving terminal feedback is to receive wrong (nack), then transmitting terminal retransmits data block.
In existing standard, at centralized scheduling, transparent RS has described a kind of DL RS assistedHARQ process.The purpose of this process is to utilize RS to assist re-transmission between terminal and the BS, to improve the reliability of system transmissions.Its main thought is BS when directly sending data to terminal, the data of notifying RS to monitor this session simultaneously, and RS monitors and these data of decoding, and feedback response gives BS, and BS decides according to response that to retransmit be by own initiation, still notifies RS to initiate.DL RS assistedHARQ has defined dual mode, a kind of is encoded ack/nack mode, under this mode, BS is after MS sends down data subframes, how determine self to BS feedback reception information by the reception information that RS returns according to MS, BS carries out the judgement and the processing of data re-transmission according to the reception information of RS feedback.This mode is responded according to MS by RS and handles, thereby has increased the complexity that RS realizes.Another kind of mode is a direct ack/nack mode, and RS is indifferent to the response of MS, but carries out the judgement and the processing of data re-transmission by BS according to RS and MS response separately, thereby has reduced the RS implementation complexity.
Fig. 1 is the method flow diagram of down mixing self-retransmission in the prior art.As shown in Figure 1, this method may further comprise the steps:
Step 100:BS is RS allocation of downlink resource and ascending resource, and indication RS monitors the down data subframes (data sub-burst) that BS sends to MS.
In this step, BS is at descending mapping (DL-MAP, Downlink MAP) gives RS allocation of downlink resource in, and issue DL-MAP monitoring information unit (DL-MAP MONITOR IE) and notify RS to monitor the data burst of some connection of UE, in DL-MAP MONITOR IE, monitor the data of which connection with connection identifier (CID, Connection Identifier) indication RS.Simultaneously in the up mapping (UL-MAP, Uplink MAP) of this frame, distribute ascending resource responsive channels (UL ackchannel), the reception information of coming feeding back downlink HARQ data burst in order to RS, i.e. ack or nack information to RS.In addition, indication RS adopts direct ack/nack mode among the DL-MAP MONITOR IE, and at this moment RS can monitor downlink data but can not monitor corresponding up ack/nack.
Step 101:BS is MS allocation of downlink and downlink resource.
In this step, BS gives MS allocation of downlink resource in DL-MAP in the frame identical with step 100, distribute ascending resource UL ack channel to MS simultaneously in UL-MAP, the reception information of coming feeding back downlink HARQ data burst in order to MS, i.e. ack or nack information.
Step 102: in the down data subframes of same number of frames, BS directly sends data to MS.RS monitors the corresponding data burst that connects of the CID that indicates in DL-MAP MONITOR IE simultaneously.
RS and MS enter different handling processes according to each self-demarking code of the data of being received according to decoded result then.
casel：
After step 103:RS listened to the corresponding down data subframes that connects of indication CID, decoded data was judged to receive correctly or receive mistake.If the reception mistake is then returned nack and is given BS in the UL ack channel that BS has distributed.At this moment the down data subframes can buffer memory do not received of RS.
Step 104:MS decodes after receiving down data subframes, judges to receive correct or the reception mistake.If the reception mistake is then returned nack and is given BS in the UL ack channel that BS has distributed.
Step 105:BS determines that according to receiving the nack of RS and the nack of MS RS and MS decoded data all do not have successfully, and at this moment BS determines to carry out data re-transmission by self.
Case2：
After step 106:RS listened to the down data subframes of indication CID, decoded data was judged to receive correct or the reception mistake.If the reception mistake is then returned nack and is given BS in the UL ack channel that BS has distributed.At this moment the down data subframes can buffer memory do not received of RS.
Step 107:MS decodes after receiving down data subframes, judges to receive correct or the reception mistake.If receive correctly, then in the UL ack channel that BS has distributed, return ack and give BS, promptly this data burst transmits successfully.
Case3：
After step 108:RS listens to the corresponding down data subframes that connects of CID, decoded data, and judge that reception is correct or receive mistake.If receive correctly, the down data subframes that the RS buffer memory is received is so that be used for carrying out data re-transmission when needed.
Step 109: at this moment RS returns ack and gives BS in the UL ack channel that BS has distributed.
Step 110:MS decodes after receiving down data subframes, judges to receive correct or the reception mistake.If the reception mistake is then returned nack and is given BS in the UL ack channel that BS has distributed.
Step 111:BS is according to receiving the ack of RS and the nack of MS, and it is correct to determine that RS receives, and MS receives mistake, and at this moment BS determines to carry out data re-transmission by RS.
Case4：
After step 112:RS listened to the corresponding down data subframes that connects of CID, decoded data was judged to receive correctly or receive mistake.If receive correctly, the down data subframes that the RS buffer memory is received is so that be used for carrying out data re-transmission when needed.
Step 113:RS returns ack and gives BS in the UL ack channel that BS has distributed.
Step 114:MS decodes after receiving down data subframes, judges to receive correct or the reception mistake.If receive correctly, then in the UL ack channel that BS has distributed, return ack and give BS, promptly this frame transmits successfully.
As seen, in the method for existing down mixing self-retransmission, when RS receives correctly and is data cached, no matter MS receives correct or receives mistake, all there is not mechanism to notify RS, will cause all at case3 and case4 both of these case promptly that the data in buffer subframe can not discharge among the RS, cause that data in buffer can not discharge in time among the RS, thereby directly influence capacity and the performance of RS.
Summary of the invention
The embodiment of the invention provides a kind of method of down mixing self-retransmission, makes RS can quick and precisely discharge the data in the buffer memory, improves capacity and the performance of RS.
The embodiment of the invention also provides a kind of system of down mixing self-retransmission, makes RS can quick and precisely discharge the data in the buffer memory, improves capacity and the performance of RS.
The embodiment of the invention also provides a kind of RS, makes RS can quick and precisely discharge the data in the buffer memory, improves capacity and the performance of RS.
For achieving the above object, the technical scheme of the embodiment of the invention is achieved in that
A kind of method of down mixing self-retransmission comprises:
Relay station RS and mobile station MS receive base station BS respectively to the down data subframes that MS sends, and BS is given in the response of returning respectively separately that expression receives correctly or the expression reception is wrong;
If correct described down data subframes, the described down data subframes of RS buffer memory of receiving of RS; If MS receives correct response to the up response that BS returns for expression, the down data subframes of RS release self buffer memory.
A kind of system of down mixing self-retransmission comprises base station BS and relay station RS,
Described BS is used for sending down data subframes to MS; Receive the up response that MS and RS return separately;
Described RS is used to receive described BS to the down data subframes that MS sends, and returns up response to BS; If correct described down data subframes, the described down data subframes of buffer memory of receiving; If the up response that MS returns to BS, discharges the down data subframes of self buffer memory for expression receives correct response.
A kind of relay station RS comprises receiver module, verification module, cache module and up response judge module,
Described receiver module is used to receive the down data subframes that base station BS sends to mobile station MS;
Described verification module is used to judge when described receiver module correctly receives described down data subframes, by the described down data subframes of cache module buffer memory;
Described up response judge module is used to judge when up response that MS returns to BS receives correct response for expression, is discharged the down data subframes of buffer memory by described cache module.
Compared with prior art, the technical scheme that the embodiment of the invention provided, RS has correctly received the down data subframes that BS sends to MS, when MS also successfully receives the down data subframes of BS transmission, RS can obtain MS down data subframes is received correct response, thereby can delete the down data subframes of self buffer memory, avoid the problem that cache resources can not in time discharge among the RS, improve RS and capacity and performance.
Description of drawings
Fig. 1 is the method flow diagram of down mixing self-retransmission in the prior art;
Fig. 2 is the method flow diagram of down mixing self-retransmission in the embodiment of the invention;
Fig. 3 is the method flow diagram of down mixing self-retransmission in the embodiment of the invention one;
Fig. 4 is the method flow diagram of down mixing self-retransmission in the embodiment of the invention two;
Fig. 5 is a system of down mixing self-retransmission structure chart in the embodiment of the invention.
Embodiment
The present invention is described in detail below in conjunction with drawings and the specific embodiments.
Fig. 2 is the method flow diagram of down mixing self-retransmission in the embodiment of the invention.As shown in Figure 2, this method may further comprise the steps: in the step 200, RS and MS receive the down data subframes that BS sends to MS respectively, and BS is given in correct response or the wrong response of returning respectively separately of expression reception of expression reception; In the step 201, when correctly receiving this down data subframes as if RS, this down data subframes of buffer memory; And execution in step 202: receive correct response if MS returns the up response of BS for expression, the down data subframes of RS release self buffer memory.
Below with two embodiment the method for down mixing self-retransmission of the present invention is further described.In embodiment described below, it is ack that expression receives correct response, and it is nack that expression receives wrong response.It will be understood by those skilled in the art that expression receives correct response and represents that the wrong response of reception can be other response except that ack and nack.
Embodiment one:
Present embodiment is realized monitoring the up response that MS returns to BS by RS in the method for down mixing self-retransmission.
Fig. 3 is the method flow diagram of down mixing self-retransmission in the embodiment of the invention one.As shown in Figure 3, this method may further comprise the steps:
Step 300:BS is that RS distributes the uplink and downlink resource, and indication RS monitors the data burst that BS sends to MS; The up response that the default monitoring of RS MS returns to BS.
In this step, BS gives RS allocation of downlink resource in DL-MAP, and issues DL-MAPMONITOR IE and notify RS to monitor the data burst of some connection of UE, indicates RS to monitor the data of which connection with CID in DL-MAPMONITOR IE.Simultaneously in the UL-MAP of this frame, distribute ascending resource UL ack channel, the reception information of coming feeding back downlink HARQ data burst in order to RS, i.e. ack or nack to RS.In addition, indication RS adopts direct ack/nack mode among the DL-MAP MONITOR IE, and at this moment RS can monitor down data subframes, simultaneously, and the up response ack/nack of default monitoring MS; When perhaps monitoring the up response of down data subframes and MS by BS indication RS, RS monitors the up response of this down data subframes and MS.
Step 301:BS is that MS distributes ascending resource and downlink resource.
In this step, BS gives MS allocation of downlink resource in the DL-MAP of the frame identical with step 300, distributes ascending resource UL ack channel to MS simultaneously in UL-MAP, the reception information of coming feeding back downlink HARQ data burst in order to MS, i.e. ack or nack information.
Step 302: in the down data subframes of same number of frames, BS directly sends data to MS.RS monitors the corresponding data burst that connects of the CID that indicates in DL-MAP MONITOR IE simultaneously.
RS and MS enter different handling processes according to each self-demarking code of the data of being received according to decoded result then.
casel：
After step 303:RS listened to the corresponding down data subframes that connects of CID, decoded data was judged to receive correctly or receive mistake.If the reception mistake is then returned nack and is given BS in the UL ack channel that BS has distributed.At this moment the RS down data subframes received of buffer memory not.
Step 304:MS decodes after receiving down data subframes, judges to receive correct or the reception mistake.If the reception mistake is then returned nack and is given BS in the UL ack channel that BS has distributed.
Step 305:BS determines that according to receiving the nack of RS and the nack of MS RS and MS decoded data all do not have successfully, and at this moment BS determines to carry out data re-transmission by self.
Case2：
After step 306:RS listened to the corresponding down data subframes that connects of CID, decoded data was judged to receive correctly or receive mistake.If the reception mistake is then returned nack and is given BS in the UL ack channel that BS has distributed.At this moment the RS down data subframes received of buffer memory not.
Step 307:MS decodes after receiving down data subframes, judges to receive correct or the reception mistake.If receive correctly, then in the UL ack channel that BS has distributed, return ack and give BS, promptly this frame transmits successfully.
Case3：
After step 308:RS listens to the corresponding down data subframes that connects of CID, decoded data, and judge that reception is correct or receive mistake.If receive correctly, the down data subframes that the RS buffer memory is received is so that be used for carrying out data re-transmission when needed.
Step 309: at this moment RS returns ack and gives BS in the UL ack channel that BS has distributed.
Step 310:MS decodes after receiving down data subframes, judges to receive correct or the reception mistake.If the reception mistake is then returned nack and is given BS in the UL ack channel that BS has distributed.
Step 311:BS is according to receiving the ack of RS and the nack of MS, and it is correct to determine that RS receives, and MS receives mistake, and at this moment BS carries out data re-transmission by RS.
Step 312:RS listens to MS and returns ack, then discharges the data in buffer subframe.
Case4：
After step 313:RS listened to the corresponding down data subframes that connects of CID, decoded data was judged to receive correctly or receive mistake.If receive correctly, the down data subframes that the RS buffer memory is received is so that be used for carrying out data re-transmission when needed.
Step 314:RS returns ack and gives BS in the UL ack channel that BS has distributed.
Step 315:MS decodes after receiving down data subframes, judges to receive correct or the reception mistake.If receive correctly, then in the UL ack channel that BS has distributed, return ack and give BS, promptly this frame transmits successfully.
Step 316:RS listens to after MS returns to the response ack of BS, discharges the down data subframes of self buffer memory.
Embodiment two:
Present embodiment is realized will being notified to RS from the ack response message of MS by BS in the method for down mixing self-retransmission.
Fig. 4 is the method flow diagram of down mixing self-retransmission in the embodiment of the invention two.As shown in Figure 3, this method may further comprise the steps:
Step 400:BS is that RS distributes the uplink and downlink resource, and indication RS monitors the data burst that BS sends to MS.
Step 401～step 410 is identical with the described content of step 301～step 310 among the embodiment one, does not repeat them here.
Step 411:BS is according to receiving the ack of RS and the nack of MS, and it is correct to determine that RS receives, and MS receives mistake, and BS determines to carry out data re-transmission by RS.
Step 412～step 414 is identical with step 313～step 315, is not described in detail in this.
Step 415～step 416:BS is notified to RS after receiving the ack that MS returns, and after RS receives, discharges the down data subframes of self buffer memory.
Fig. 5 is a system of down mixing self-retransmission structure chart in the embodiment of the invention.As shown in Figure 5, this system comprises BS and RS.
Wherein, BS is used for sending down data subframes to MS; Receive the up response that MS returns, judge when this up response is nack, determine to be undertaken the data re-transmission of this down data subframes by RS;
RS is used to monitor the down data subframes that BS sends to MS, when this down data subframes of correct reception, and this down data subframes of buffer memory; When the up response of returning to BS as MS is ack, discharge the down data subframes of self buffer memory.
Specifically, RS comprises receiver module, verification module, cache module and up response judge module.
Receiver module is used to receive the down data subframes that base station BS sends to mobile station MS; The verification module is used to judge when receiver module correctly receives down data subframes, by cache module buffer memory down data subframes; Up response judge module is used to judge when up response that MS returns to BS receives correct response for expression, is discharged the down data subframes of buffer memory by cache module.
RS in the embodiment of the invention may further include the monitoring module, is used to monitor the up response that MS returns to BS; Correspondingly, up response judge module judges that according to the up response that described monitoring module listens to described up response receives correct response for expression.
The receiver module of RS can receive BS and receive the notice that expression that MS returns to BS sends to RS when receiving correct response in the embodiment of the invention; Correspondingly, up response judge module judges that according to the notice that BS sends up response receives correct response for expression.
By the above as can be seen, the technical scheme that the embodiment of the invention provided, after the down data subframes of correct reception of RS and buffer memory BS transmission, if MS has also correctly received this down data subframes, then RS can obtain MS down data subframes is received correct response, or the down data subframes that sends at MS reception BS is not successful, and after RS correctly received this down data subframes, RS carries out data re-transmission, also can obtain MS and receive the correct response of down data subframes that retransmits, thereby can delete the down data subframes of self buffer memory,, greatly improve capacity and the performance of RS so that discharge data in buffer among the RS rapidly and accurately.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.The order of embodiment manner of execution do not represented in " step " speech that the invention described above embodiment describes yet.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1, a kind of method of down mixing self-retransmission is characterized in that, this method comprises:
Relay station RS and mobile station MS receive base station BS respectively to the down data subframes that MS sends, and BS is given in the response of returning respectively separately that expression receives correctly or the expression reception is wrong;
If correct described down data subframes, the described down data subframes of RS buffer memory of receiving of RS; If MS receives correct response to the up response that BS returns for expression, the down data subframes of RS release self buffer memory.
2, the method for claim 1 is characterized in that, this method further comprises:
If the up response that MS returns receives wrong response for expression, BS determines to carry out the re-transmission of described down data subframes by RS.
3, method as claimed in claim 2 is characterized in that, the re-transmission that described RS carries out described down data subframes comprises:
RS sends described down data subframes to MS;
If MS receives correct response to the up response that BS returns for expression, the down data subframes of RS release self buffer memory.
As each described method in the claim 1 to 3, it is characterized in that 4, before the down data subframes of RS release self buffer memory, this method further comprises: the expression that BS returns MS receives correct response and is notified to RS;
If RS determines up response that MS returns to BS for expression receives correct response according to the notice of BS, discharge the down data subframes of self buffer memory.
As each described method in the claim 1 to 3, it is characterized in that 5, before the down data subframes of described RS release self buffer memory, this method further comprises: RS monitors the up response that MS returns to BS;
If RS listens to described up response for expression receives correct response, discharge the down data subframes of self buffer memory.
6, method as claimed in claim 5 is characterized in that, described BS indication RS monitors the up response that MS returns to BS.
7, the method for claim 1 is characterized in that, it is ack that described expression receives correct response; It is nack that described expression receives wrong response.
8, a kind of system of down mixing self-retransmission is characterized in that, this system comprises base station BS and relay station RS,
Described BS is used for sending down data subframes to MS; Receive the up response that MS and RS return separately;
Described RS is used to receive described BS to the down data subframes that MS sends, and returns up response to BS; If correct described down data subframes, the described down data subframes of buffer memory of receiving; If the up response that MS returns to BS, discharges the down data subframes of self buffer memory for expression receives correct response.
9, system as claimed in claim 8, it is characterized in that, described BS determines to receive the up response that RS returns and receives correct response for expression, and the up response that MS returns receives wrong response for expression, determines to carry out the re-transmission of described down data subframes by RS.
10, system as claimed in claim 8 or 9 is characterized in that, the expression that described BS returns MS receives correct response and is notified to RS;
Described RS determines up response that MS returns to BS for expression receives correct response according to the notice of BS, discharges the down data subframes of self buffer memory.
11, system as claimed in claim 8 or 9 is characterized in that, described RS monitors the up response that MS returns to BS, receives correct response if listen to expression, discharges the down data subframes of self buffer memory.
12, a kind of relay station RS is characterized in that, this RS comprises receiver module, verification module, cache module and up response judge module,
Described receiver module is used to receive the down data subframes that base station BS sends to mobile station MS;
Described verification module is used to judge when described receiver module correctly receives described down data subframes, by the described down data subframes of cache module buffer memory;
Described up response judge module is used to judge when up response that MS returns to BS receives correct response for expression, is discharged the down data subframes of buffer memory by described cache module.
13, RS as claimed in claim 12 is characterized in that, described RS further comprises the monitoring module, is used to monitor the up response that MS returns to BS;
Described up response judge module judges that according to the up response that described monitoring module listens to described up response receives correct response for expression.
14, method as claimed in claim 12 is characterized in that, described receiver module receives BS and receiving the notice that expression that MS returns to BS sends to RS when receiving correct response;
Described up response judge module judges that according to the notice that described BS sends described up response receives correct response for expression.
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| CNA2007101540295A CN101383685A (en) | 2007-09-07 | 2007-09-07 | Downlink hybrid automatic retransmission method, system and apparatus |
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| CNA2007101540295A CN101383685A (en) | 2007-09-07 | 2007-09-07 | Downlink hybrid automatic retransmission method, system and apparatus |
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| WO2010127573A1 (en) * | 2009-05-04 | 2010-11-11 | 中兴通讯股份有限公司 | Method and device for downlink cooperation retransmission in a relay station |
| WO2011020233A1 (en) * | 2009-08-17 | 2011-02-24 | 上海贝尔股份有限公司 | Method and apparatus for downlink data transmission control in multi-hop relay communication system |
| WO2011038648A1 (en) * | 2009-09-29 | 2011-04-07 | 华为技术有限公司 | Uplink hybrid automatic repeat request method and device in transparent relay network |
| CN102273118A (en) * | 2011-04-18 | 2011-12-07 | 华为终端有限公司 | Data retransmission method, apparatus and system |
| CN102739375A (en) * | 2011-03-31 | 2012-10-17 | 北京新岸线无线技术有限公司 | Method and device for retransmission |
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| WO2010127573A1 (en) * | 2009-05-04 | 2010-11-11 | 中兴通讯股份有限公司 | Method and device for downlink cooperation retransmission in a relay station |
| US8654781B2 (en) | 2009-05-04 | 2014-02-18 | Zte Corporation | Method and device for downlink cooperation retransmission in a relay station |
| US9001726B2 (en) | 2009-05-22 | 2015-04-07 | Zte Corporation | Method for implementing relay station downlink cooperative retransmission and a relay station |
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| CN102474391B (en) * | 2009-08-17 | 2014-07-02 | 上海贝尔股份有限公司 | Method and apparatus for controlling data retransmission in wireless relay network |
| WO2011038648A1 (en) * | 2009-09-29 | 2011-04-07 | 华为技术有限公司 | Uplink hybrid automatic repeat request method and device in transparent relay network |
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| CN102273118A (en) * | 2011-04-18 | 2011-12-07 | 华为终端有限公司 | Data retransmission method, apparatus and system |
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