CN103312473A - Method and device for reducing HARQ (Hybrid Automatic Repeat Request) combination failures - Google Patents
Method and device for reducing HARQ (Hybrid Automatic Repeat Request) combination failures Download PDFInfo
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Abstract
The invention discloses a method for reducing HARQ (Hybrid Automatic Repeat Request) combination failures. The method comprises the following steps: a base station transmits data which is transmitted for the first time to a user terminal UE (User Equipment), wherein the redundancy version of the data is 0; when a received response is a DTX (Discontinuous Transmission) response, the base state retransmits the data. The invention further provides a corresponding device. The method and device for reducing the HARQ combination failures can be used for effectively avoiding the HARQ combination failures caused by leak detection of DCI (Display Control Interface) information which is transmitted for the first time without influencing the normal HARQ transmission.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of HARQ of minimizing and merge failed method and device.
Background technology
At LTE(Long Term Evolution, Long Term Evolution) in the system, the transmission of downlink data is by PDCCH channel (Physical Downlink Control Channel, Physical Downlink Control Channel) (the Downlink Control Information of the DCI on, Downlink Control Information) information notice UE (User Equipment, user terminal) needs the data format of demodulation, UE is according to the demodulating information that provides in the DCI information afterwards, at PDSCH(Physical Downlink Shared Channel, Physical Downlink Shared Channel) obtain corresponding data on the channel.If the DCI information on the PDCCH channel is lost in the UE side, UE can't solve the data on the PDSCH channel so.
In LTE FDD(Frequency Division Duplexing, full duplex) in, downlink data transmission adopts HARQ(Hybrid Automatic Repeat Request, mixed automatic retransfer request) transmission mechanism, the UE side is as follows to the step that HARQ processes:
At first, if the new data indicator of a transmission block has sent variation with respect to the last time transmission, perhaps this is first transmission block of receiving, thinks that so this is a new transmission, otherwise, just think to retransmit.If this is a new transmission, UE becomes the data replacement in the current soft buffer memory data receive so, if this is a re-transmission, and these data are not successfully decoding also, UE merges the data of the data received and soft buffer memory so, if the data of receiving are inconsistent with the size of data in the soft buffer memory, the data that so data replacement in the current soft buffer memory become to receive.Then attempt the data in the soft buffer memory of this transmission block of decoding, successfully decoded then indicates physical layer to produce ACK.
The HARQ transmission can be adopted IR(Incremental Redundancy, incremental redundancy) merging and CC (Chase Combining, convolution code) mode that merges, and in the IR merging, RV(Redundancy Version, redundancy versions) there are four kinds, be respectively 0,2,3,1, different information bits and redundant bit have carried in different RV version numbers, and when RV version number is 0 loss of data, UE will have very large probability can't correctly solve data.
So whether all to send RV be that 0 version is just best to UE, in fact, it is exactly that what retransmit is different RV edition datas that IR merges topmost advantage, generally speaking, comparing the CC merging all is that RV is 0 transmission, and the IR of the different RV of employing 0,2,3,1 merges its coding gain and is greater than the CC merging patterns.
As shown in Figure 1, in the LTE system, when UE is in far point, because the increasing of disturbing, the DCI information of PDCCH channel also might be able to not correctly detect, therefore the UE solution does not go out correct data, and the base station can retransmit according to the mechanism that HARQ retransmits, but because first DCI information, be that RV is that 0 DCI information is undetected, all retransmit one time even RV is the data of 2,3,1 version, UE also is difficult to correctly solve these data, has wasted on the contrary transfer resource.
Summary of the invention
Main purpose of the present invention is effectively avoided merging unsuccessfully because head passes the undetected HARQ that causes of DCI information for providing a kind of HARQ of minimizing to merge failed method and device, and does not affect normal HARQ transmission.
The present invention proposes a kind of HARQ of minimizing and merges failed method, comprises step:
The base station sends the first data that pass to user terminal UE; The redundancy versions of described data is 0;
When the response of receiving is the discontinuous transmitting DTX response, retransmit described data.
Preferably, when the described response when receiving of execution is the DTX response, behind the retransmission data, also comprise:
When sending times reaches a preset value, stop to retransmit and discharging the HARQ resource.
Preferably, when the described response when receiving of execution is the DTX response, behind the retransmission data, also comprise:
When the response of the decoding failure of receiving UE, the HARQ the number of transmissions adds 1 and to send successively redundancy versions be 2,3,1 data until HARQ merges successfully.
Preferably, when the described response when receiving of execution is the DTX response, behind the retransmission data, also comprise:
When the response of the successfully decoded of receiving UE, finish the HARQ transmission.
Preferably, when described response when receiving was the DTX response, retransmission data comprised:
The new data indicator of described retransmission data, Resource Block, transmission block size and the first data consistent that passes, otherwise wait for next time scheduling.
The present invention also proposes a kind of HARQ of minimizing and merges failed device, comprising:
First transmission module is used for sending the first data that pass to user terminal UE; The redundancy versions of described data is 0;
Retransmit module is used for retransmitting described data when the response of receiving is the discontinuous transmitting DTX response.
Preferably, described retransmit module also is used for:
When sending times reaches a preset value, stop to retransmit and discharging the HARQ resource.
Preferably, described retransmit module also is used for:
When the response of the decoding failure of receiving UE, the HARQ the number of transmissions adds 1 and to send successively redundancy versions be 2,3,1 data until HARQ merges successfully.
Preferably, described retransmit module also is used for:
When the response of the successfully decoded of receiving UE, finish the HARQ transmission.
Preferably, described retransmit module specifically is used for:
The new data indicator of described retransmission data, Resource Block, transmission block size and the first data consistent that passes, otherwise wait for next time scheduling.
A kind of HARQ that reduces that the present invention proposes merges failed method and device, special processing has been carried out in response to DTX in descending HARQ transmission course, by time feedback DTX response carries out in the situation that head passes data RV is 0 data re-transmission, reduce most possibly the undetected first possibility that passes the DCI message of data of UE, thereby be 0 data so that UE can receive the most full RV of system information, effectively reduce the UE side downlink data HARQ that causes in the undetected situation of DCI message of first biography data and merged unsuccessfully, improved the transmission performance of system.
Description of drawings
Fig. 1 is the schematic flow sheet that IR merges in the prior art HARQ transmission;
Fig. 2 is that the present invention reduces the schematic flow sheet that HARQ merges an application scenarios among failed method one embodiment;
Fig. 3 is that the present invention reduces the schematic flow sheet that HARQ merges Another Application scene among failed method one embodiment;
Fig. 4 is that the present invention reduces the schematic flow sheet that HARQ merges another application scenarios among failed method one embodiment;
Fig. 5 is that the present invention reduces the structural representation that HARQ merges failed device one embodiment.
The realization of the object of the invention, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The method and apparatus that the present invention adopts can be avoided the HARQ merging failure problem that causes because the DCI message of first biography data is undetected effectively.The RV that namely passes data for head is 0 data, always allow UE receive as far as possible, if DCI message is examined in the UE side leakage, then the base station reissue once or repeatedly RV be 0 data, to guarantee that UE can correctly receive the DCI information that head passes data, even also can be follow-up re-transmission merging, first biography data decode failure provides the basis.
Because base station itself can't judge whether UE has received DCI message, even by the detection to the DTX on PUCCH channel and PUSCH channel response, can only judge that also UE may not receive DCI message and causes and without any feedback or UE decoding downlink data success or failure and feedback information does not arrive the base station.Head in above-mentioned kind of situation passes data and reissues, and needs then to consider that UE receives the situation of DCI message, and is specific as follows:
The first situation, UE does not receive the first DCI message that passes data, and the mode when this moment, the base station need to pass data according to head is dispatched, and namely the new data indicator of retransmission data is with the first data consistent that passes, RV is 0, but Resource Block, modulation coding mode and transmission block size can be inconsistent with first biography.
The second situation, UE has received the DCI message of first biography data, but decode unsuccessfully, and the response NACK of the decoding failure of feedback does not arrive the base station, the re-transmission flow process of base station this moment under actual need only the merging according to normal IR send the data of 2,3,1 RV successively, if the base station is that 0 data resend once with RV, and new data indicator is constant, if then the transmission block size is identical, UE can put into new data the data of receiving before the soft buffer memory neutralization and merge, and also is equivalent to once retransmit.
The third situation, UE has received the DCI message of first biography data, and successfully decoded, but the response ACK of the successfully decoded of feedback does not arrive the base station, this moment, in fact the base station need not send any re-transmission, if the base station has sent new data, but new data indicator is constant, then UE directly abandons new data.
Comprehensive above three kinds of situations, base station side is in the first transmission of data and receive in the situation of DTX response of feedback, if pass data consistent with new data indicator with head, RV is 0, transmission block size, Resource Block, modulation coding mode all consistent mode are dispatched, can guarantee that then UE does not receive in the situation of the first DCI message that passes data, again get access to before consistent DCI information.In the situation of UE feedback NACK, then increased the chance that once retransmits merging.The situation of UE feeding back ACK is next only to be waste one bag data, namely no matter above which kind of situation does not have mistake and can effectively reissue the first data that pass.
According to above-mentioned analysis, with reference to Fig. 2, propose the present invention and reduce failed method one embodiment of HARQ merging, comprise step:
S10, base station send the first data that pass to UE; The RV of described data is 0;
S11, when the response of receiving is DTX when response, retransmit described data.
Hereinafter be transmitted as example with the once simple HARQ under the different scenes, specify the implementation process of the method for the present embodiment:
In transmission course, the base station has sent the DCI information of first biography data, and RV is 0.
(1) received that such as the base station feedback of UE is DTX response, then the base station retransmits according to the information that passes data consistent with head, and namely RV, new data indicator, transmission block size keep with the first data consistent that passes, and the number of transmissions of base station maintenance does not change, as shown in Figure 2.
(2) as the base station received UE be fed back to DTX response after, can be that 0 data are sent out once again with RV according to describing the base station in above (1), but the UE feedback still is the DTX response after might this data re-transmitting, and it is 0 data that the base station can continue to retransmit RV according to aforesaid operations.But this re-transmission need to be carried out in certain limit, and the data of feedback DTX response are carried out RV is 0 re-transmission if do not add under some extreme cases temperately repeatedly, then may waste too many transfer resource.Therefore if the number of times of continuous feedback DTX response has surpassed a default sending times N(N and has chosen according to the situation of system's reality, such as N=4), think that then HARQ merges unsuccessfully, release HARQ resource, as shown in Figure 3.
(3) no matter in any case, UE has fed back the failed response NACK of decoding, then the base station is according to the normal re-transmission flow processing of IR merging, be that the HARQ the number of transmissions adds 1, no matter whether UE has returned the DTX response afterwards, all DTX response is treated as NACK, and to send successively RV be 2,3,1 data until default sending times N or receive the response ACK of successfully decoded, as shown in Figure 4.
(4) no matter in any case, if the response ACK of the successfully decoded of UE feedback is received in the base station, then represent this Packet Generation success, as shown in Figure 4.
It should be noted that, first pass the feedback DTX response of data and when retransmitting or firstly receive continuously repeatedly the DTX response after passing data and when retransmitting receiving, new data indicator, transmission block size need and the first data that pass are consistent, and it is consistent in the necessary same step (1) of the resource of base station assigns distribution, therefore system needs the preferential identical resource that guarantees to distribute, if system can't distribute identical resource, then need wait until next time scheduling.
By above step, can effectively avoid UE undetected DCI information when head passes data, if undetected DCI message then by the remedying of base station, can make UE regain the first data that pass.If DCI information is not missed, then being equivalent to the base station, data have been carried out RV is the repeating transmission that 0 head passes data, but fed back after the NACK as UE, illustrated that then UE has received the DCI information of first biography, then can to send RV be that the HARQ that 2,3,1 data are used for UE merges in the base station.
Compared with prior art, the present embodiment has carried out special processing to DTX response in descending HARQ transmission course, by time feedback DTX response carries out in the situation that head passes data RV is 0 data re-transmission, reduce most possibly the undetected first possibility that passes the DCI message of data of UE, thereby be 0 data so that UE can receive the most full RV of system information, effectively reduce the UE side downlink data HARQ that causes in the undetected situation of DCI message of first biography data and merged unsuccessfully, improved the transmission performance of system.
With reference to Fig. 5, propose the present invention and reduce failed device one embodiment of HARQ merging, comprising:
The device of the present embodiment can be the base station in the HARQ transmission system, or a device that is connected with the base station.Hereinafter be transmitted as example with the once simple HARQ under the different scenes, specify the operation principle of the device of the present embodiment:
In transmission course, first transmission module 10 has sent the DCI information of first biography data to UE, and RV is 0.
(1) received that such as the base station feedback of UE is DTX response, then retransmit module 20 retransmits according to the information that passes data consistent with head, and namely RV, new data indicator, transmission block size keep with the first data consistent that passes, and the number of transmissions of base station maintenance does not change.
(2) as the base station received UE be fed back to DTX response after, can be that 0 data are sent out once again with RV according to describing retransmit module 20 in above (1), but the UE feedback still is the DTX response after might this data re-transmitting, and it is 0 data that retransmit module 20 can continue to retransmit RV according to aforesaid operations.But this re-transmission need to be carried out in certain limit, and the data of feedback DTX response are carried out RV is 0 re-transmission if do not add under some extreme cases temperately repeatedly, then may waste too many transfer resource.Therefore if the number of times of continuous feedback DTX response has surpassed a default sending times N(N and has chosen according to the situation of system's reality, such as N=4), think that then HARQ merges unsuccessfully, release HARQ resource.
(3) no matter in any case, UE has fed back the failed response NACK of decoding, then retransmit module 20 is according to the normal re-transmission flow processing of IR merging, be that the HARQ the number of transmissions adds 1, no matter whether UE has returned the DTX response afterwards, all DTX response is treated as NACK, and to send successively RV be 2,3,1 data until default sending times N or receive the response ACK of successfully decoded.
(4) no matter in any case, if the response ACK of the successfully decoded of UE feedback is received in the base station, then represent this Packet Generation success.
It should be noted that, first pass the feedback DTX response of data and when retransmitting or firstly receive continuously repeatedly the DTX response after passing data and when retransmitting receiving, new data indicator, transmission block size need and the first data that pass are consistent, and it is consistent in the necessary same step (1) of the resource of base station assigns distribution, therefore system needs the preferential identical resource that guarantees to distribute, if system can't distribute identical resource, then need wait until next time scheduling.
The device of the present embodiment can be avoided UE undetected DCI information when head passes data effectively by above operation, if undetected DCI message then by the remedying of this device, can make UE regain the first data that pass.If DCI information is not missed, then being equivalent to this device, data have been carried out RV is the repeating transmission that 0 head passes data, but when UE has fed back after the NACK, illustrate that then UE has received the DCI information of first biography, then can to send RV be that the HARQ that 2,3,1 data are used for UE merges to this device.
Compared with prior art, the present embodiment has carried out special processing to DTX response in descending HARQ transmission course, by time feedback DTX response carries out in the situation that head passes data RV is 0 data re-transmission, reduce most possibly the undetected first possibility that passes the DCI message of data of UE, thereby be 0 data so that UE can receive the most full RV of system information, effectively reduce the UE side downlink data HARQ that causes in the undetected situation of DCI message of first biography data and merged unsuccessfully, improved the transmission performance of system.
The above only is the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. one kind is reduced the failed method of HARQ merging, it is characterized in that, comprises step:
The base station sends the first data that pass to user terminal UE; The redundancy versions of described data is 0;
When the response of receiving is the discontinuous transmitting DTX response, retransmit described data.
2. the method for claim 1 is characterized in that, when the described response when receiving of execution is the DTX response, behind the retransmission data, also comprises: when sending times reaches a preset value, stop to retransmit and discharging the HARQ resource.
3. method as claimed in claim 1 or 2 is characterized in that, when the described response when receiving of execution is the DTX response, behind the retransmission data, also comprises:
When the response of the decoding failure of receiving UE, the HARQ the number of transmissions adds 1 and to send successively redundancy versions be 2,3,1 data until HARQ merges successfully.
4. method as claimed in claim 1 or 2 is characterized in that, when the described response when receiving of execution is the DTX response, behind the retransmission data, also comprises:
When the response of the successfully decoded of receiving UE, finish the HARQ transmission.
5. method as claimed in claim 1 or 2 is characterized in that, when described response when receiving was the DTX response, retransmission data comprised:
The new data indicator of described retransmission data, Resource Block, transmission block size and the first data consistent that passes, otherwise wait for next time scheduling.
6. one kind is reduced the failed device of HARQ merging, it is characterized in that, comprising:
First transmission module is used for sending the first data that pass to user terminal UE; The redundancy versions of described data is 0;
Retransmit module is used for retransmitting described data when the response of receiving is the discontinuous transmitting DTX response.
7. device as claimed in claim 6 is characterized in that, described retransmit module also is used for:
When sending times reaches a preset value, stop to retransmit and discharging the HARQ resource.
8. such as claim 6 or 7 described devices, it is characterized in that, described retransmit module also is used for:
When the response of the decoding failure of receiving UE, the HARQ the number of transmissions adds 1 and to send successively redundancy versions be 2,3,1 data until HARQ merges successfully.
9. such as claim 6 or 7 described devices, it is characterized in that, described retransmit module also is used for:
When the response of the successfully decoded of receiving UE, finish the HARQ transmission.
10. such as claim 6 or 7 described devices, it is characterized in that, described retransmit module specifically is used for:
The new data indicator of described retransmission data, Resource Block, transmission block size and the first data consistent that passes, otherwise wait for next time scheduling.
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| CN113067681B (en) * | 2020-01-02 | 2023-08-18 | 中国移动通信有限公司研究院 | Hybrid automatic repeat request processing method, communication equipment and medium |
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