CN102124685A - A self-adapting HARQ method, apparatus and device - Google Patents

A self-adapting HARQ method, apparatus and device Download PDF

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Publication number
CN102124685A
CN102124685A CN2008801307683A CN200880130768A CN102124685A CN 102124685 A CN102124685 A CN 102124685A CN 2008801307683 A CN2008801307683 A CN 2008801307683A CN 200880130768 A CN200880130768 A CN 200880130768A CN 102124685 A CN102124685 A CN 102124685A
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packet
reception
feedback
received
message
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CN102124685B (en
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陈继明
王伟
金珊
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Nokia Shanghai Bell Co Ltd
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Alcatel Lucent Shanghai Bell Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0643—Properties of the code block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]

Abstract

A self-adapting HARQ method, apparatus and device are provided by the embodiments of this invention. A receiving end receives the data packet, and feeds the different message to the transmitting end self-adaptively according to the detecting condition of the date packet and the reception times. The transmitting end selects a retransmitting scheme self-adaptively according to the retransmitting times and the received feedback message, if it is the first time to retransmit, the data packet is retransmitted to the receiving end by using HARQ technology which is based on STBC, wherein, the retransmitting data packet and the first transmitted data packet form a STBC code word; if it is the second time to retransmit or more times retransmission, the data packet is retransmitted by using HARQ technology which is based on the closed loop MIMO system, wherein, a pre-encode matrix is selected according to the feedback pre-encode matrix index, the data packet that will be transmitting in this time is pre-encoded, then is retransmitted to the receiving end. Wherein, pre-encode matrix is calculated according to the result of unitedly optimizing the received data packet and the data packet that will be received at the next time, and the pre-encoded matrix index is fed back to the transmitting end. By applying the self-adapting HARQ scheme of this invention, the time diversity gain and the total space diversity gain can be obtained, the delay of the system can be reduced, the throughput of the MIMO system can be improved, and it can split the difference between the performance and the complexity.

Description

Method, device and the equipment of adaptive HARQ
Adaptive H ARO method, device and equipment technical field
The present invention relates to method, device and the equipment of the communication technology, more particularly to adaptive HARQ.Background technology
In a wireless communication system, MIMO (mimo antennas technologies）System is used for providing spatial reuse to improve point-to-point link capacity, but due to the deep fade of time varying channel, disturbed between substantial amounts of noise and cochannel, receiving terminal can not correctly recover the packet of transmission, thus mixed automatic retransfer HARQ technologies extensively using to merge decoding error packet and retransmit packet to strengthen the reliability of packet transmission.
Many HARQ transmission technologies for being applied to mimo system have been proposed at present.In traditional simple repetition transmission HARQ scheme, transmitting terminal passes through two or many antennas launch at least 2 packets.If the packet of transmitting is not correctly received, then Jie Shou Duan Lost fall the packet of the initial transmission received, and in retransmission phase, it is simple to repeat to send the packet.Table 1 illustrates that two transmitting antennas and two piece-root graftings are received in antenna system according to the data package retransmission method of traditional simple HARQ scheme, wherein Si and S2It is the packet being launched.Using this method, retransmit complete a repeated encoding process for the first time, can accordingly obtain partial diversity gain.Because full diversity gains can not be obtained by simply repeating transmission, the reliability of re-transmission cannot strengthen, and Time Delay of Systems can accordingly increase.
Table 1
To obtain whole diversity gains and retransmission scheme simply, bibliography 1:Elisabeth de Carvalho and Petar Popovski, " the MIMO Systems of 2 x of Strategies for ARQ in 2; " IEEE communications letters, vol. 12, no. 6, June 2008, pp. 441-443 propose the HARQ retransmission techniques based on STBC, wherein retransmit packet and keep identical data, and allow the change of data symbol, Data Conjugate change and antenna assignment Change.It is clear that this retransmits to form a STBC code word twice（Based on packet）.Table 2 gives the data packet retransmission scheme of the HARQ based on STBC in 2 X 2MIMO systems.Wherein in the first stage, packet Si launches and S from antenna 12Launch from antenna 2.If two packets mistake all occur in decoding, then in second stage, antenna assignment is exchanged i.e. ,-S2* retransmitted from antenna 1, Si* is retransmitted from antenna 2, then the packet that receiving terminal is received twice constitutes STBC groups, the recovery for completing packet is decoded using STBC.If at this moment still made a mistake during decoded packet data, retransmit still send raw data packets so that the packet retransmitted with first time forms a STBC code word together for the second time, the 3rd this re-transmission then sends the packet retransmitted for the first time, and so on.Because the STBC full diversity gains produced and antenna array gain can resist channel fading, the probability that packet is properly received can be improved every time by retransmitting.But, will reduction using the reliability that is properly received of the retransmission scheme if decoding error is caused by cochannel interference.
Table 2
Mistake is received caused by confrontation intra-cell interference and inter-cell interference, HARQ technologies based on closed-loop MIMO system are suggested to reduce interference, its general principle is, one pre-coding matrix is calculated according to the channel information of reception and the precoding matrix information is fed back, retransmit every time, transmitting terminal carries out precoding using the pre-coding matrix of feedback to retransmitting data, re-transmission is obtained diversity gain；Meanwhile, receiving terminal, the multichannel MIMO signal received according to given re-transmission merging type, such as Chase Merge Scenarioses and incremental redundancy Merge Scenarios with maximally utilising.Bibliography 2:Byung-Jae Kwak, Dong SeungKwon, et. AL, " HARQ in a Closed Loop MIMO System ", ETRI, IEEE C802.16m-08/440 are proposed in a kind of HARQ scheme of closed-loop MIMO system, the program, a Linear precoding matrix is first selected to carry out precoding to the packet of transmission when retransmitting every time, merge the data repeatedly retransmitted in receiving terminal improves decoding probability to obtain higher merging gain.Fig. 1 provides the implementation structural representation of closed-loop MIMO system HARQ scheme, and wherein S is packet vector, and WL is pre-coding matrix.The reception signal of the re-transmission is wherein H, is the mimo channel matrix of the/time transmission, L is maximum transmission times, n For noise.By-l re-transmissions of L, the data that receiving terminal is repeatedly received can be cascaded and are expressed as:
By the merging treatment of symbol level, merge the obtained probability increase disturbed to reduce intra-cell interference and interval, be then properly received packet accordingly of gain.But it is due to channel time-varying characteristics, retransmitting every time need to be according to channel estimation calculation pre-coding matrix W, and program computation complexity is too high so that being difficult to using in systems in practice.The content of the invention
To solve disadvantages mentioned above of the prior art, the present invention proposes new adaptive HARQ method, device and equipment.Receiving terminal received data packet, according to packet detection case and reception number of times, the different message of adaptive feedback are to transmitting terminal.Transmitting terminal is according to number of retransmissions and the feedback message received, adaptively selected retransmission scheme, if retransmitting for the first time, packet is retransmitted to receiving terminal, the re-transmission packet and the packet one STBC code word of formation sent for the first time with the HARQ technologies based on STBC；If second and the re-transmission of more high order, select to retransmit packet with the HARQ technologies based on closed-loop MIMO system, according to the pre-coding matrix index of feedback, select pre-coding matrix, to being retransmitted after the packet progress precoding of this transmission to receiving terminal.Wherein, pre-coding matrix is with being calculated and by the precoding matrix index feedback to transmitting terminal after the next packet combined optimization retransmitted reception by receiving terminal according to received packet.
Further, the present invention also proposes a combined optimization algorithm, and the channel shape when channel condition information and current data packet when receiving terminal is transmitted by combining former packets are transmitted obtains bigger diversity gain, to resist the interference of in cell and minizone.Specifically, based on maximum S/N R criterions, the pre-coding matrix of calculation optimization.Packet and next time that will be received be retransmitted the packet joint progress symbol level merging of reception, and pre-coding matrix is calculated under output signal to noise ratio S NR criterions after symbol level merges maximizing.
The present invention merges to the symbol level of receiving terminal also further to be optimized, will before several times The packet of reception merges after eliminating the correct packet of decoding respectively with the packet progress symbol level of this reception, and symbol level carries out combined decoding after merging.Equally, the optimization that symbol level merges can also be applied in combined optimization algorithm, packet that will be received is eliminated after decoded correct packet and retransmitted next time respectively carries out symbol level merging by the packet joint of reception, and pre-coding matrix is calculated under output signal to noise ratio SNR criterion after symbol level merges maximizing.
In addition, selective retransmission can be also applied in the present invention, i.e. receiving terminal is according to decoding cases, by decoding error feedback of the information to transmitting terminal, transmitting terminal is according to decoding error information, the packet of decoding error is selected as re-transmission packet, and is sent together with new data packets, with reinforcement mouthful handling capacity.
Specifically, according to an embodiment of the invention there is provided a kind of adaptive HARQ method, this method includes：Transmitting terminal sends packet；Receiving terminal received data packet, judges to receive number of times, according to reception number of times determination data packet inspection method, and according to the packet testing result message different with number of times feedback is received to transmitting terminal；Transmitting terminal receives feedback message, determines retransmission scheme according to feedback message and number of retransmissions and retransmits content.
According to the alternative embodiment of the present invention, receiving terminal judges to receive number of times, includes according to number of times determination data packet inspection method is received：If it is 0 to receive number of times, directly received data packet is decoded；Otherwise by the packet and the preceding packet received several times of this reception, joint is decoded after symbol level merging.
It is just blunt according to an alternative embodiment of the invention, the packet and the preceding packet received several times that this is received are combined decode after symbol level merging and refer to the packet progress symbol level of this reception merge after the preceding packet received several times to be eliminated to the correct packet of decoding respectively, and joint is decoded after symbol level merges.
According to the alternative embodiment of the present invention, included according to the message that packet testing result is different with number of times feedback is received to transmitting terminal：
If decoded packet data is correct, one ACK (affirmative acknowledgement) message of feedback receives number of times and is set to 0 to transmitting terminal;If decoded packet data mistake, judge
If receiving number of times reaches a setting value, a NAK (negative response is fed back）Message receives number of times and is set to 0 to transmitting terminal; If receiving number of times is less than setting value, store the packet of reception, will receive number of times power mouthful 1 also,
If it is 1 to receive number of times, receiving terminal sends a NAK message to transmitting terminal；If receiving number of times is more than 1, calculates a pre-coding matrix and feed back the pre-coding matrix index and a NAK message to transmitting terminal.
According to the alternative embodiment of the present invention, further comprised according to packet testing result and reception number of times if decoded packet data mistake, receive number of times and be less than a setting value, receiving terminal also sends a data bag decoding error information to transmitting terminal.
According to the alternative embodiment of the present invention, transmitting terminal determines that retransmission scheme and re-transmission content include according to feedback message and number of retransmissions：
If receiving ACK message, new data packets are sent, number of retransmissions is set to 0;If receiving NAK message, number of retransmissions plus 1 and number of retransmissions is judged：If number of retransmissions is 1, the packet that the packet of first time transmission is transmitted as this, and packet is retransmitted to receiving terminal, the re-transmission packet and the packet one STBC code word of formation sent for the first time with the HARQ technologies based on STBC；
If number of retransmissions is not more than a default value, the packet that the packet of first time transmission is transmitted as this, and the pre-coding matrix index selection pre-coding matrix in feedback message, to being retransmitted after the packet progress precoding of this transmission to receiving terminal；If number of retransmissions is more than a default value, new data packets are sent, number of retransmissions is set to 0.
According to the alternative embodiment of the present invention, further, the packet that first time is transmitted is to be selected to need the packet retransmitted and the packet for being used as this to transmit according to packet error information as this packet transmitted.
According to the alternative embodiment of the present invention, the packet of this transmission further comprises new data packets.
Just blunt according to an alternative embodiment of the invention, transmitting terminal retransmits packet with the HARQ technologies based on STBC and refers to that transmitting terminal sends the common strategic point of initial data packets.
According to the alternative embodiment of the present invention, transmitting terminal retransmits packet with the HARQ technologies based on STBC and refers to that transmitting terminal sends the orthogonal sequence corresponding to initial data packets. According to the alternative embodiment of the present invention, described one pre-coding matrix of calculating is to be based on maximum S/N R criterions, calculates the pre-coding matrix of optimization.
According to the alternative embodiment of the present invention, the packet of reception is combined into progress symbol level merging by retransmitting received packet and next time, pre-coding matrix is calculated under output signal-to-noise ratio SNR criterion after symbol level merges maximizing.
According to the alternative embodiment of the present invention, received packet is referred to eliminate to combine the packet of reception with re-transmission next time after decoded correct packet according to bag point Do by received number to carry out symbol level merging with retransmitting next time the packet of reception combine into progress symbol level to merge.
According to the alternative embodiment of the present invention, the setting value refers to the maximum retransmission of default.
According to an embodiment of the invention there is provided a kind of repeating method of adaptive HARQ, this method includes：Transmitting terminal sends packet, and transmitting terminal receives feedback message, determines retransmission scheme according to feedback message and number of retransmissions and retransmits content.
According to the alternative embodiment of the present invention, transmitting terminal determines that retransmission scheme and re-transmission content include according to feedback message and number of retransmissions：
If receiving ACK message, new data packets are sent, number of retransmissions is set to 0;If receiving NAK message, number of retransmissions plus 1 and number of retransmissions is judged：If number of retransmissions is 1, the packet that the packet of first time transmission is transmitted as this, and packet is retransmitted to receiving terminal, the re-transmission packet and the packet one STBC code word of formation sent for the first time with the HARQ technologies based on STBC；
If number of retransmissions is not more than a default value, the packet that the packet of first time transmission is transmitted as this, and the pre-coding matrix index selection pre-coding matrix in feedback message, to being retransmitted after the packet progress precoding of this transmission to receiving terminal；If number of retransmissions is more than a default value, new data packets are sent, number of retransmissions is set to 0.
According to the alternative embodiment of the present invention, further, the packet of first time transmission is referred into the packet of the packet error information selection needs re-transmission in feedback message as this packet transmitted and the packet of this transmission is used as. According to the alternative embodiment of the present invention, the packet of this transmission further comprises new data packets.
According to the alternative embodiment of the present invention, transmitting terminal retransmits packet with the HARQ technologies based on STBC and refers to that transmitting terminal sends the common strategic point for the packet that needs are transmitted.
According to the alternative embodiment of the present invention, transmitting terminal retransmits packet with the HARQ technologies based on STBC and refers to that the orthogonal sequence corresponding to the packet that transmitting terminal transmission needs are transmitted is bad | J.
According to an embodiment of the invention there is provided a kind of reception feedback method of adaptive HARQ, this method includes：Receiving terminal receives the packet, judges to receive number of times, is detected according to number of times determination data bag is received；And according to the packet testing result message different with number of times feedback is received to transmitting terminal.
According to the alternative embodiment of the present invention, receiving terminal judges to receive number of times, includes according to the detection of number of times determination data bag is received：If it is 0 to receive number of times, directly received data packet is decoded；Otherwise by the packet and the preceding packet received several times of this reception, joint is decoded after symbol level merging.
Occupy the alternative embodiment of the present invention, the packet and the preceding packet received several times that this is received are combined decode after symbol level merging and refer to the packet progress symbol Grade of this reception merge after the preceding packet received several times to be eliminated to the correct packet of decoding respectively, and joint is decoded after symbol level merges.
According to the alternative embodiment of the present invention, included according to the message that packet testing result is different with number of times feedback is received to transmitting terminal：
If decoded packet data is correct, one ACK message of feedback receives number of times and is set to 0 to transmitting terminal;
If decoded packet data mistake, judge
If receiving number of times reaches a setting value, one NAK message of feedback receives number of times and is set to 0 to transmitting terminal;
If receiving number of times is less than setting value, store the packet of reception, will receive number of times power mouthful 1 also,
If it is 1 to receive number of times, receiving terminal sends a NAK message to transmitting terminal； If receiving number of times is more than 1, calculates a pre-coding matrix and feed back the pre-coding matrix index and a N AK message to transmitting terminal.
According to the alternative embodiment of the present invention, further comprised according to the message that packet testing result is different with number of times feedback is received to transmitting terminal if decoded packet data mistake, receive number of times and be less than a setting value, receiving terminal also sends a data bag decoding error information to transmitting terminal.
According to the alternative embodiment of the present invention, it is to be based on maximum S/N R criterions to calculate a pre-coding matrix, calculates the pre-coding matrix of optimization.
According to the alternative embodiment of the present invention, the packet of reception is combined into progress symbol level merging by retransmitting received packet and next time, pre-coding matrix is calculated under output signal-to-noise ratio SNR criterion after symbol level merges maximizing.
According to the present invention an alternative embodiment, will received packet with next time retransmit by the packet of reception combine progress symbol level merge refer to by received packet eliminate respectively after decoded correct packet with next time re-transmission by the packet of reception combine carry out symbol level merging.
According to the alternative embodiment of the present invention, the setting value refers to the maximum retransmission of default.
According to an embodiment of the invention there is provided a kind of retransmission arrangement of adaptive HARQ, the device includes：Transmitting element, for sending packet；Receiving unit, for receiving feedback message；Judging unit, for judging feedback message and number of retransmissions；Processing unit, for determining retransmission scheme according to feedback message and number of retransmissions and retransmitting content.
According to the alternative embodiment of the present invention, determine that retransmission scheme and re-transmission content include according to feedback message and number of retransmissions：
If receiving ACK message, new data packets are sent, number of retransmissions is set to 0;If receiving NAK message, number of retransmissions plus 1 and number of retransmissions is judged：If number of retransmissions is 1, the packet that the packet of first time transmission is transmitted as this, and packet is retransmitted to receiving terminal, the re-transmission packet and the packet one STBC code word of formation sent for the first time with the HARQ technologies based on STBC；
If number of retransmissions is not more than a default value, by the packet of first time transmission As the packet of this transmission, and the pre-coding matrix index selection pre-coding matrix in feedback message, to being retransmitted after the packet progress precoding of this transmission to receiving terminal；
If number of retransmissions is more than a default value, new data packets are sent, number of retransmissions is set to 0.
According to the alternative embodiment of the present invention, if receiving NAK message, the packet of first time transmission is referred into the packet error information selection needs packet retransmitted and the packet for being used as this to transmit in feedback message as this packet transmitted.
According to the alternative embodiment of the present invention, the packet of this transmission further comprises new data packets.
According to the alternative embodiment of the present invention, the common strategic point that packet refers to send the packet of needs transmission is retransmitted with the HARQ technologies based on STBC.
According to the alternative embodiment of the present invention, packet is retransmitted with the HARQ technologies based on STBC and refers to send the orthogonal sequence corresponding to the packet that needs are transmitted.
According to an embodiment of the invention there is provided a kind of reception feedback device of adaptive HARQ, the device includes：Receiving unit, for receiving the packet；Judging unit, for judging to receive number of times and packet decoding cases；Data packet detecting unit member, for according to reception number of times determination data bag detection；Feedback unit, for according to the packet testing result message different with number of times feedback is received.
According to the alternative embodiment of the present invention, include according to the detection of number of times determination data bag is received：If it is 0 to receive number of times, directly received data packet is decoded；Otherwise by the packet and the preceding packet received several times of this reception, joint is decoded after symbol level merging.
According to the alternative embodiment of the present invention, the packet and the preceding packet received several times that this is received are combined decode after symbol level merging and refer to the packet progress symbol level of this reception merge after the preceding packet received several times to be eliminated to the correct packet of decoding respectively, and joint is decoded after symbol level merges.
According to the alternative embodiment of the present invention, included according to the message that packet testing result is different with number of times feedback is received：
If decoded packet data is correct, an ACK message is fed back, number of times is received and is set to 0; If decoded packet data mistake, judge
If receiving number of times reaches a setting value, a NAK message is fed back, number of times is received and is set to 0;
If receiving number of times is less than setting value, store the packet of reception, will receive number of times add 1 also,
If it is 1 to receive number of times, receiving terminal sends a NAK message；
If receiving number of times is more than 1, calculates a pre-coding matrix and feed back the pre-coding matrix index and a NAK message.
According to the alternative embodiment of the present invention, further comprise according to the different message of number of times feedback are received if decoded packet data mistake, receive number of times and be less than a setting value, also send a data bag decoding error information.
According to the alternative embodiment of the present invention, it is to be based on maximum S/N R criterions to calculate a pre-coding matrix, calculates the pre-coding matrix of optimization.
According to the alternative embodiment of the present invention, the packet of reception is combined into progress symbol level merging by retransmitting received packet and next time, pre-coding matrix is calculated under output signal-to-noise ratio SNR criterion after symbol level merges maximizing.
According to the present invention an alternative embodiment, will received packet with next time retransmit by the packet of reception combine progress symbol level merge refer to by received packet eliminate respectively after decoded correct packet with next time re-transmission by the packet of reception combine carry out symbol level merging.
According to the alternative embodiment of the present invention, the setting value refers to the maximum retransmission of default.
According to an embodiment of the invention there is provided a kind of network side equipment of use adaptive HARQ, include the retransmission arrangement of above-mentioned adaptive HARQ.
According to an embodiment of the invention there is provided a kind of terminal device of use adaptive HARQ, include the retransmission arrangement of above-mentioned adaptive HARQ.
According to an embodiment of the invention there is provided a kind of network side equipment of use adaptive HARQ, include the reception feedback device of upper fan's adaptive HARQ.
According to an embodiment of the invention, there is provided a kind of end of use adaptive HARQ End equipment, includes the reception feedback device of above-mentioned adaptive HARQ.
The method provided by using the present invention, device and equipment, according to the adaptively selected HARQ technologies of number of retransmissions, and combined optimization pre-coding matrix weights, re-transmission is set to obtain time diversity gain and total space diversity gain, system delay can be reduced, the handling capacity of mimo system is improved, and has one preferably to compromise between performance and complexity.Brief description of the drawings will become clearer and it can be readily appreciated that wherein by the explanation below in conjunction with accompanying drawing, and with to more comprehensively understanding of the invention, other objects of the present invention and effect：
Fig. 1 represents the schematic block diagram of the HARQ scheme of closed-loop MIMO system.
Fig. 2 represents that according to the HARQ scheme schematic flow sheet of an embodiment of the invention, maximum retransmission be 2.
Fig. 3 represents the HARQ scheme schematic flow sheet according to an embodiment of the invention, band packet error information.
Fig. 4 represents the indicative flowchart of the HARQ repeating methods using an embodiment of the invention.
Fig. 5 represents to receive the indicative flowchart of feedback method according to the HARQ of an embodiment of the invention.
Fig. 6 represents the structural schematic block diagram of the retransmission arrangement according to an embodiment of the invention.
Fig. 7 represents the structural schematic block diagram of the reception feedback device according to an embodiment of the invention.
Fig. 8 represents the handling capacity simulation result schematic diagram based on 2 2MIMO systems according to the present invention.
Fig. 9 represents the average transmission number of times simulation result schematic diagram based on 2 X 2MIMO systems according to the present invention.
In all above-mentioned accompanying drawings, identical label is represented with identical, similar or corresponding feature or function. Embodiment
Embodiments of the present invention are specifically described below in conjunction with accompanying drawing.
Embodiments of the present invention are realized based on mimo system, in terms of description, by taking the antenna systems of 2 x 2 as an example, but the invention is not limited in this.It will be understood by those of skill in the art that MIMO systems there are many optional antenna configurations, and the present invention can be applied to.Above-mentioned setting is merely illustrative ') raw explanation.
In MIMO systems, if occurring decoding error in receiving terminal, typically caused by three reasons：（1) substantial amounts of noise（2) deep fade of time varying channel（3) serious cochannel interference.When the reliability of packet transmission is improved when application HARQ technologies, the selection of retransmission scheme need to be adaptively selected according to different error reasons.When the transmitting terminal in mimo system receives NAK message, transmitting terminal is to know the packet sent by noise and channel deep fade, or noise and cochannel interference, or more three reasons together heavy damage and produce decoding error.
For reduction implementation complexity, in the present invention, one HARQ scheme based on STBC of selection is retransmitted for the first time, Space Time Coding is carried out to resist channel deep fade, the i.e. data to initial transmission.
If there is mistake after initial transmission and the space-time decoding retransmitted for the first time, illustrate that MI MO channels do ^ " by serious cochannel, now retransmit the HARQ scheme of one closed-loop MIMO system of selection.
It is ensuing to retransmit the HARQ scheme for still selecting closed-loop MIMO system, until receiving terminal decodes maximum retransmission that is correct or reaching default.
That is, the present invention is on the basis of the reason for decoding error occurs for receiving terminal in analyzing MIMO systems, propose according to the adaptively selected retransmission scheme of number of retransmissions, HARQ retransmission technique of the selection based on STBC is retransmitted for the first time, wherein retransmit packet and keep identical data, and allow the change of data symbol, Data Conjugate change and the change of antenna assignment.This retransmits to form a STBC code word twice（Based on packet）.Because the STBC full diversity gains produced and antenna array gain can resist channel fading, the probability that packet is properly received can be improved every time by retransmitting.Second and the ensuing HARQ scheme retransmitted using closed-loop MIMO system, retransmit every time, receiving terminal according to receiving signal estimation channel status, And a pre-coding matrix is calculated according to channel condition information, and by the precoding matrix index feedback to transmitting terminal, transmitting terminal selects a pre-coding matrix according to the pre-coding matrix index received, to being retransmitted again to receiving terminal after the data progress precoding of this re-transmission, re-transmission is set to obtain diversity gain；Meanwhile, receiving terminal improves decoding probability according to given re-transmission merging type, such as Chase Merge Scenarioses and incremental redundancy Merge Scenarios, the data that merging is repeatedly retransmitted to obtain higher merging gain.
Further, the present invention also proposes a combined optimization algorithm, and the channel shape when channel condition information and current data packet when receiving terminal is transmitted by combining former packets are transmitted obtains bigger diversity gain, to resist the interference of in cell and minizone.Specifically, based on maximum S/N R criterions, the pre-coding matrix of calculation optimization.Packet and next time that will be received be retransmitted the packet joint progress symbol level merging of reception, and pre-coding matrix is calculated under output signal to noise ratio SNR criterions after symbol level merges maximizing.
Symbol level of the invention to receiving terminal, which merges, also further to be optimized, and the packet that preceding will be received several times merges after eliminating the correct packet of decoding respectively with the packet progress symbol level of this reception, and symbol level carries out combined decoding after merging.Equally, the optimization that symbol level merges can also be applied in combined optimization algorithm, packet that will be received is eliminated after decoded correct packet and retransmitted next time respectively carries out symbol level merging by the packet joint of reception, and pre-coding matrix is calculated under output signal to noise ratio SNR criterion after symbol level merges maximizing.
In addition, selective retransmission can be also applied in the present invention, i.e. receiving terminal is according to decoding cases, by decoding error feedback of the information to transmitting terminal, transmitting terminal is according to decoding error information, the packet of decoding error is selected as re-transmission packet, and is sent together with new data packets, with reinforcement mouthful handling capacity.
With reference to Fig. 2, the course of work of adaptive HARQ is illustrated.In the present embodiment, maximum retransmission is set as 2.In addition to reducing the expense of precoding matrix feedback, the present embodiment, which is used, is based on code book（Codebook form feeding back precoding matrix), i.e. receiving-transmitting sides pre-define the code character of finite length, receiving terminal is according to the pre-coding matrix calculated, then find in the codebook and represent the index value of the pre-coding matrix and feed back to transmitting terminal, transmitting terminal is according to the pre-coding matrix received, corresponding pre-coding matrix is found in the codebook, is entered Row precoding is disturbed to eliminate cochannel.During system initialization, receiving terminal, transmitting terminal will receive number of times respectively, and number of retransmissions is initialized as 0, and it is that maximum retransmission is 2 to set a setting value, and configures code book.
At step S201, transmitting terminal sends initial data packets（Sl5 S2) 。
At step S211, receiving terminal received data packet receives signal and is represented by：
Wherein ^'' /=1,2, it is the channel coefficients between reception antenna i and transmitting antenna j.
Receiving terminal judges to receive number of times for 0, and the data to reception are directly decoded, it is assumed that decoding error, will receive number of times and adds 1, stores the data received, and feed back a NAK message.
At step S202, transmitting terminal receives NAK message, and number of retransmissions adds 1, and judges it is to retransmit for the first time, then selects to be retransmitted with the HARQ technologies based on STBC, and retransmitting packet is（-S2*, Si*).
At step S212, the signal that receiving terminal is received is expressed as follows：
Judge to receive number of times for 1, then merge formula（3) 、 （4), obtain
In formula（5) on the basis of, the docking collection of letters number carries out a joint-detection：Symbol level merges, and decodes.Assuming that decoding error, then judges to receive number of times for 1, less than maximum retransmission 2, then receive number of times and add 1, store the data received, and calculate pre-coding matrix：Assuming that the reception signal retransmitted after i.e. second re-transmission can be expressed as follows next time：
Wherein, 1 the number of transmissions is represented, now 1=3, W represents pre-coding matrix,W" " =It is precoding weight coefficient when using the HARQ scheme of closed-loop MIMO for the first time.
Merge formula（5) and（6) it can obtain：
Its simplified expression is
R=Hs+n (8) fi is the aggregate channel being transmitted several times, and S is that the noise after merging is transmitted several times,SIt is the multichannel data bag of transmission, r represents to be transmitted several times the reception signal after 1.SNR after symbol level detection merges can be according to formula（7) calculate, be expressed as W function, i.e.,
Wherein,g' ' be least mean-square error MMSE weights row vector, be expressed as
=[gi, g2]r(10) transposition of expression vector, []-1Represent finding the inverse matrix,（) " conjugate transposition of vector is represented, I represents unit matrix.And£' be S i-th of column vector.Based on maximum S/N R criterions, the pre-coding matrix of optimization is calculated, i.e.,
= arg max x(h; ,h2 , hj3) , h( 2 3)； W{1) )
Wherein, argmax represents to seek the value of the W (l) when making γ maximum w (i) (11), and γ represents that receiving terminal merges the SNR of output,
hl = [/ZU ' ^2 ] ' h2 = I l , ] , hi3) = [/ΐ,
Receiving terminal finds corresponding pre-coding matrix index in code table and the pre-coding matrix index and a Ν Α Κ message is fed back into transmitting terminal together according to the pre-coding matrix calculated.
At step S203, transmitting terminal receives the pre-coding matrix index of Ν Α Κ message and feedback, number of retransmissions adds 1, judgement is second of re-transmission, corresponding pre-coding matrix is then selected according to the pre-coding matrix index of feedback message in the codebook, receiving terminal is sent to retransmitting after packet carries out pre-coding matrix.
At step S213, the signal that receiving terminal is received is represented such as formula（7) shown in.In formula（7) on the basis of, the docking collection of letters number carries out a symbol level merging, and decodes.Assuming that decoding is correct, number of times will be received and set to 0, and feeding back ACK message is to transmitting terminal. At step S204, transmitting terminal receives ACK message, number of retransmissions is set to 0, and send new data packets.
Without loss of generality, Fig. 3 provides the course of work for L adaptive HARQ, L according to the maximum retransmission of an embodiment of the invention>2.Also, in the embodiment that Fig. 3 is represented, optimization is merged to the symbol level of receiving terminal and is also described in detail based on decoding error information progress selective retransmission.Equally, in order to reduce the expense of precoding matrix feedback, the present embodiment, which is used, is based on code book（Codebook form feeding back precoding matrix).During system initialization, receiving terminal, transmitting terminal will receive number of times respectively, and number of retransmissions is initialized as 0, and it is that maximum retransmission is L to set a setting value, and configures code book.
At step S301, transmitting terminal sends initial data packets（St , S2 ) 。
At step S31 1, receiving terminal received data packet receives signal such as formula（3) represent.
Receiving terminal judges to receive number of times for 0, and the data to reception directly detect decoding, it is assumed that 8 decoding errors, S2Decoding is correct, will receive number of times and adds 1, stores the data received, and feed back a NAK message and packet error message.
At step S302, transmitting terminal receives NAK message, and number of retransmissions adds 1, and judges it is to retransmit for the first time, will only be retransmitted according to the selection of the packet error information of reception, and will（-S3*, as the packet of transmission.As shown in table 3.
Table 3 At step S312, the signal that receiving terminal is received is expressed as follows
n
Judge to receive number of times for 1, then first time is received and the data of this reception carry out symbol level merging, according to first time packet error information, the signal that first time is received, which is eliminated, decodes correct packet S2, i.e., by formula（In 3) /z2,A22Set to 0.That is formula（3) it is revised as：
〔η、
V h"2、1 Merge formula（12), (13), obtain formula（ 14 ) (14) The docking collection of letters number carries out a joint-detection, and symbol level merges, and decodes.Assuming that Si decoding errors, then judge to receive number of times for 1, less than maximum retransmission L, then receive number of times and add 1, store the data received, and calculate pre-coding matrix.The calculating of pre-coding matrix as described in step S212, unlike, by formula（7) it is varied to formula（ 15) ：
Will for the first time, the packet of second of reception carries out symbol level merging after eliminating the correct packet of decoding respectively.According to formula（15) ask maximize SNR under pre-coding matrix be
W(,) =argmax^(hI,h2,hj3),h^3);W(1))
w('>(16) wherein, argmax represents to seek the value of the W (l) when making γ maximum, and γ represents that receiving terminal merges the SNR of output, now
H, is o.Connect The pre-coding matrix index, NAK message and packet decoding error information are simultaneously fed back to transmitting terminal by code matrix index together.
At Bu Sudden S303, transmitting terminal receives the pre-coding matrix index of NAK message and feedback, and number of retransmissions adds 1, and judgement is that second of re-transmission is less than maximum retransmission L, will only be retransmitted according to the selection of the packet error information of reception, and will（S!, S4) it is used as the packet of transmission, wherein S4For new data packets.Corresponding pre-coding matrix is then selected according to the pre-coding matrix index of feedback message in the codebook, receiving terminal is sent to retransmitting after packet carries out pre-coding matrix.
At step S313, receiving terminal receives number of times and is（L- 1), processing procedure similar step S312 descriptions.Now formula（11) it is revised as：
W(i-2)=argmax (hnh2,hi3\h( 2 3 .^hji\h^\w(^--^W{i-3); (i^)
w(") (17) Wherein, argmax represents to seek W when making γ maximum(L-2)Value, and γ represents that receiving terminal merges the SNR of output, and L represents maximum transmission times,h' =LA, ' A2] , h ) =[))], i=l, 2.0 is also corresponded in each corresponding weights of the correct data of decoding that retransmit.
At Bu Sudden S304, the similar Bu Sudden S303 descriptions of transmitting terminal processing procedure.
At step S3 14, receiving terminal received data packet is simultaneously decoded, similar step S312 respective process, it is assumed that decoding error after optimization symbol level merging treatment, is judged to receive number of times for L, is reached maximum retransmission.Number of times will be then received to set to 0 and feed back a NAK message.
At step S305, transmitting terminal receives a NAK message, judges number of retransmissions for L, has reached the maximum retransmission of setting, and transmitting terminal sends new data packets.
Fig. 4 gives the indicative flowchart of the HARQ repeating methods according to an embodiment of the invention.
At step S401, transmitting terminal sets maximum retransmission.And set to 0 number of retransmissions initialization, code book is set.
At step S402, transmitting terminal transmission packet.At step S403, feedback information is received.
At step S404, judge whether that being connected to ACK message or number of retransmissions reaches the maximum retransmission of setting, as long as meeting both either conditions, into step S405, number of retransmissions is set to 0, at step S406, new data packets are transmitted at selection new data packets and return to step S402；If receiving NAK message and number of retransmissions being less than the maximum retransmission of setting, into step S407, selection retransmits packet.According to one embodiment of present invention, it can be initial transmission packet to retransmit packet；According to another embodiment of the invention, a data bag decoding error information is included in feedback message, according to decoded packet data error message, the packet of decoding error is selected as retransmitting packet and and the packet that is retransmitted together as this of new data packets.
At step S408, number of retransmissions plus 1.Whether at step S409, it is 1 to judge number of retransmissions, if it is, into step S410, the re-transmission packet of selection in the HARQ modes based on STBC retransmit and new data packets are transmitted at return to step S402；If it is determined that number of retransmissions is not 1, then enter step S41 1, the pre-coding matrix index in feedback message selects corresponding pre-coding matrix, then at step S412, the packet of selection is retransmitted in the HARQ modes based on closed-loop MIMO, the re-transmission data that will be selected Bag carries out precoding, is then back to transmission new data packets at step S402.
Fig. 5 gives the indicative flowchart that feedback method is received according to the HARQ of an embodiment of the invention.
At step S501, receiving terminal sets maximum retransmission.And set to 0 reception number of times initialization, code book is set.
At step S502, received data packet.
At step S503, judge to receive whether number of times is 0, if it is, showing that this reception is to receive for the first time, the data received are directly detected and decoded；If it is not, then showing that this reception is to receive to retransmit packet, then the packet received is subjected to joint-detection.According to one embodiment of present invention, joint-detection is that the data and the preceding data received several times for receiving this are decoded after symbol level merging, disturbs and interval disturbs to obtain in merging gain, reduction cell thousand.According to another embodiment of the invention, using the symbol level merging treatment of optimization, the packet that preceding will be received several times eliminates the packet decoded after correct packet with this reception and merged in symbol level respectively.How to eliminate and be described in detail, repeat no more here.
Enter step S506 after decoding, judge whether decoding is correct, if decoding is correct, into step S508, number of times will be received and set to 0 and send ACK message, step S502 received data packets are then back to.If decoding error, into step S509, determine whether to receive number of times, if receiving number of times is equal to setting value, that is, maximum retransmission is reached, then into step S510, send NAK message and set to 0 number of times is received, be then back to step S502 received data packets.
If receiving number of times is equal to 1, into step S51 1, number of times will be received and add 1, the data of this reception are stored, into step S512, NAK message and packet error message is sent.Perform return to step S502 received data packets after step S512.
If receiving number of times is more than 1 maximum retransmission for being less than setting, then enter step S513, number of times will be received and add 1, store the data of this reception, into step S514, to the data aggregate optimization that re-transmission will be received received data and next time, under maximum S/N R criterion, the pre-coding matrix retransmitted next time is calculated；According to another implementation of the present invention Example, using the symbol level merging treatment of optimization during combined optimization calculating pre-coding matrix, the packet that will be had been received by, which eliminates to retransmit with next time after the correct packet of decoding respectively, merges the packet of reception in symbol level.How combined optimization, which calculates the process such as pre-coding matrix and the symbol level merging treatment using optimization, is above being described in detail, and repeats no more here.Step Sudden S515 are subsequently entered, NAK message, pre-coding matrix index and packet error message are sent, afterwards return to step S502 received data packets.
According to another embodiment of the invention, in step S512 and step S515 processing, packet error message can not also be sent.
Fig. 6 provides the structural schematic block diagram of the retransmission arrangement according to an embodiment of the invention.
In embodiments of the present invention, retransmission arrangement 600 is used to sending/retransmitting packet, including receiving unit 601, judging unit 602, processing unit 603 and transmitting element 604.
Specifically, receiving unit 601 can be configured as obtaining feedback message, feedback message can be { ACK message }, { NAK message }, { NAK message, decoded packet data error message }, { NAK message, pre-coding matrix index }, or { NAK message, pre-coding matrix index, decoded packet data error message }.ACK message or NAK message are input to judging unit 602.Decoded packet data error message and pre-coding matrix index are input to processing unit 603, and the former is used to select to retransmit packet, and the latter is used in the HARQ modes of closed-loop MIMO carry out precoding to retransmitting packet.
Judging unit judges that feedback message is ACK message, or NAK message, and judges number of retransmissions, and judged result is input to processing unit 603.
Processing unit 603 is configured as according to the adaptively selected retransmission scheme of judged result, if ACK message, and the selection new data packets of processing unit 603 are simultaneously input to transmitting element 604 and sent；If NAK message, then further according to the judged result of number of retransmissions, if number of retransmissions has reached the maximum retransmission of setting, the selection new data packets of processing unit 603 are simultaneously input to transmitting element 604 and sent；If NAK message and number of retransmissions are 1 to be less than maximum retransmission, the adaptively selected HARQ modes based on STBC of processing unit 603, which handle re-transmission packet and are input to transmitting element 604, carries out data packet retransmission；If NAK message and number of retransmissions, which are more than 1, is less than maximum retransmission, processing unit 603 The adaptively selected HARQ modes based on closed-loop MIMO, which handle re-transmission packet and are input to transmitting element 604, carries out data packet retransmission.HARQ modes based on STBC handle to retransmit packet and the HARQ modes based on closed-loop MIMO and handle and retransmit the detailed process of packet and be above described in detail, and repeat no more here.
Transmitting element 604 is configured as sending packet or retransmits packet.
Fig. 7 provides the structural schematic block diagram of the reception feedback device according to an embodiment of the invention.
In embodiments of the present invention, receiving feedback device 700 is used for received data packet and carries out message feedback, including receiving unit 701, judging unit 702, detection unit 703 and feedback unit 704 according to packet detection.
Specifically, receiving unit 701 is configured as received data packet.The packet of reception is input to detection unit 703.
Judging unit 702 is configured as judging to receive number of times and judges packet testing result.First determine whether to receive number of times, the judged result for receiving number of times is input to detection unit 703.
If detection unit 703 is configured as according to number of times progress packet detection is received, if it is 0 to receive number of times, detection unit 703 performs packet and directly detected, if receiving number of times more than 0, performs packet joint-detection.According to one embodiment of present invention, joint-detection is that the data and the preceding data received several times for receiving this are decoded after symbol level merging, to obtain merging gain, reduction intra-cell interference and interval interference.According to another embodiment of the invention, using the symbol level merging treatment of optimization, the packet that preceding will be received several times eliminates the packet decoded after correct packet with this reception and merged in symbol level respectively.How to eliminate to decode correct packet and carry out the detailed process of symbol level merging and combined decoding and be above described in detail, no longer praise state here.
The result of packet detection is input to judging unit again, and packet testing result is judged and received that number of times judges to be input to feedback unit 704 by judging unit.
Feedback unit 704 is configured as generating feedback message according to according to receiving number of times and packet testing result and sending feedback message.Specifically, feedback message can be { ACK message }, { NAK message }, { NAK message, decoded packet data error message }, { NAK message, pre-coding matrix index }, or { NAK message, pre-coding matrix index, decoded packet data mistake letter Breath }.If it is determined that the decoding of the input data bag of unit 702 is correct, then feedback unit 704 produces ACK message and sends the message, and judging unit 702 is set to 0 number of times is received;If input data bag decoding error message, handled according further to number of times judged result is received, if receiving number of times reaches setting value, i.e. maximum retransmission, the generation NAK message of feedback unit 704 simultaneously feeds back the NAK message；Judging unit 702 is set to 0 number of times is received, if it is determined that receiving number of times is equal to 1, judging unit 702 adds 1 by number of times is received, the data of this reception of the storage of detection unit 703, the generation NAK message of feedback unit 704 and packet error message simultaneously feed back NAK message and packet error message.If receiving number of times is more than 1 maximum retransmission for being less than setting, then judging unit 702 adds 1 by number of times is received, the data of this reception of the storage of detection unit 703, feedback unit 704 calculates a pre-coding matrix and simultaneously generates the feedback message and feedback for including the pre-coding matrix index, NAK message and packet error message.The calculating process of pre-coding matrix is above being described in detail, and is repeated no more here.
According to another embodiment of the invention, packet error message can not also be generated in feedback unit 704.
Figure（8), scheme（9) the handling capacity simulation result and average the number of transmissions simulation result based on 2 X 2MIMO systems according to the present invention are provided respectively, and with being compared using throughput of system, the average transmission number of times of the HARQ based on STBC.Simulation parameter is as shown in table 4, table 4
Simulation parameters
Carrier frequency 2.5GHz
Bandwidth 10MHz
Modulating-coding 16QAM-1/2
Channel coding CTC
FFT length 1024
The GPP spatial Channel Model non-line-of-sight propagations of channel model 3
(3GPP SCM urban micro NLOS) preferable channel estimation of channel estimation
Translational speed 3km/h
M maximum retransmissions 3 According to figure（8), scheme（9), it can be seen that compared to the HARQ schemes based on STBC, using the adaptive HARQ of the present invention, throughput of system increase, average transmission number of times is reduced, and therefore system delay can reduce.In addition, compared to the HARQ system based on closed loop Μ Ι Μ Ο, because first time is retransmitted using the HARQ based on STBC, complexity relative reduction.Therefore, the present invention has a preferably compromise between performance and complexity.Therefore, the present invention is resulted in and preferably compromised between performance and complexity.
The present invention can be realized with hardware, software, firmware and combinations thereof.One skilled in the art would recognize that the present invention is embodied in computer program product that can also be set on the signal bearing medium used for any suitable data processing system.This signal bearing medium can be transmission medium or the recordable media for machine sensible information, including magnetizing mediums, optical medium or other suitable medias.The example of recordable media includes：Disk or floppy disk in hard disk drive, the CD for CD-ROM drive, tape, and other thinkable media of those skilled in the art institute.One skilled in the art would recognize that the step of any communication equipment with suitable programmed device is all possible to perform the inventive method as embodied in program product.
From foregoing description it should be understood that without departing from the spirit of the invention, each embodiment of the invention can be modified and changed.Description in this specification is only used for illustrative, and is not considered as restricted.The scope of the present invention should only be limited by the claims included below.

Claims (1)

  1. Claims
    1. a kind of adaptive HARQ method, this method includes：
    Transmitting terminal sends packet；
    Receiving terminal receives the packet；
    Receiving terminal judges to receive number of times, according to reception number of times determination data packet inspection method；According to the packet testing result message different with number of times feedback is received to transmitting terminal；
    Transmitting terminal receives feedback message, determines retransmission scheme according to feedback message and number of retransmissions and retransmits content.
    2. method according to claim 1, wherein,
    The receiving terminal judges to receive number of times, included according to number of times determination data packet inspection method is received：If it is 0 to receive number of times, directly received data packet is decoded；Otherwise by the packet and the preceding packet received several times of this reception, joint is decoded after symbol level merging.
    3. method according to claim 2, wherein described packet and the preceding packet received several times by this reception joint after symbol level merging carries out decoding and refers to respectively to eliminate the preceding packet received several times to decode carrying out symbol level with the packet of this reception after correct packet and merging, and joint is decoded after symbol level merges.
    4. according to the method for Claims 2 or 3, wherein,
    Included according to the message that packet testing result is different with number of times feedback is received to transmitting terminal：
    If decoded packet data is correct, one ACK message of feedback receives number of times and is set to 0 to transmitting terminal;
    If decoded packet data mistake, judge
    If receiving number of times reaches a setting value, one NAK message of feedback receives number of times and is set to 0 to transmitting terminal;
    If receiving number of times is less than setting value, store the packet of reception, will receive number of times power mouthful 1 also,
    If it is 1 to receive number of times, receiving terminal sends a NAK message to transmitting terminal； If receiving number of times is more than 1, calculates a pre-coding matrix and feed back the pre-coding matrix index and a NAK message to transmitting terminal.
    5. method according to claim 4, wherein,
    It is described to be further comprised according to packet testing result and reception number of times if decoded packet data mistake, receive number of times and be less than a setting value, receiving terminal also sends a data bag decoding error information to transmitting terminal.
    6. the method according to claim 1-5, wherein,
    The transmitting terminal determines that retransmission scheme and re-transmission content include according to feedback message and number of retransmissions：
    If receiving ACK message, new data packets are sent, number of retransmissions is set to 0;If receiving NAK message, number of retransmissions plus 1 and number of retransmissions is judged：If number of retransmissions is 1, the packet that the packet of first time transmission is transmitted as this, and packet is retransmitted to receiving terminal, the re-transmission packet and the packet one STBC code word of formation sent for the first time with the HARQ technologies based on STBC；
    If number of retransmissions is not more than a default value, the packet that the packet of first time transmission is transmitted as this, and the pre-coding matrix index selection pre-coding matrix in feedback message, to being retransmitted after the packet progress precoding of this transmission to receiving terminal；If number of retransmissions is more than a default value, new data packets are sent, number of retransmissions is set to 0.
    7. method according to claim 6, wherein, further, the packet that first time is transmitted is to be selected to need the packet retransmitted and the packet for being used as this to transmit according to packet error information as this packet transmitted.
    8. method according to claim 7, wherein, the packet of this transmission further comprises new data packets.
    9. the method according to claim 6-8, wherein, transmitting terminal retransmits packet with the HARQ technologies based on STBC and refers to that transmitting terminal sends the common strategic point of initial data packets.
    10. the method according to claim 6-8, wherein, transmitting terminal retransmits packet with the HARQ technologies based on STBC and refers to that transmitting terminal sends the orthogonal sequence corresponding to initial data packets.
    11. the method according to claim 4-10, wherein, one pre-coding matrix of the calculating is to be based on maximum S/N R criterions, calculates the pre-coding matrix of optimization.
    12. method according to claim 11, wherein, the packet of reception is combined by the sixth of the twelve Earthly Branches received packet with re-transmission next time and carries out symbol level merging, pre-coding matrix is calculated under output signal-to-noise ratio SNR criterion after symbol Grade merges maximizing.
    13. method according to claim 12, wherein, will received packet and next time retransmit by the packet of reception combine progress symbol level merge refer to by received packet eliminate respectively after decoded correct packet with next time retransmit by the packet of reception combine carry out symbol level merging.
    14. the method according to claim 4-13, wherein, the setting value refers to the maximum retransmission of default.
    15. a kind of repeating method of adaptive HARQ, this method includes：
    Transmitting terminal sends packet；
    Transmitting terminal receives feedback message, determines retransmission scheme according to feedback message and number of retransmissions and retransmits content.
    16. repeating method according to claim 15, wherein,
    The transmitting terminal determines that retransmission scheme and re-transmission content include according to feedback message and number of retransmissions：
    If receiving ACK message, new data packets are sent, number of retransmissions is set to 0;If receiving NAK message, number of retransmissions plus 1 and number of retransmissions is judged：If number of retransmissions is 1, the packet that the packet of first time transmission is transmitted as this, and packet is retransmitted to receiving terminal, the re-transmission packet and the packet one STBC code word of formation sent for the first time with the HARQ technologies based on STBC；
    If number of retransmissions is not more than a default value, the packet that the packet of first time transmission is transmitted as this, and the pre-coding matrix index selection pre-coding matrix in feedback message, to being retransmitted after the packet progress precoding of this transmission to receiving terminal；If number of retransmissions is more than a default value, new data packets are sent, number of retransmissions is set to 0;
    17. repeating method according to claim 16, wherein, further, by first The packet of secondary transmission refers to the packet of the packet error information selection needs re-transmission in feedback message as this packet transmitted and as the packet of this transmission.
    18. repeating method according to claim 17, wherein, the packet of this transmission further comprises new data packets.
    19. the repeating method according to claim 16-18, wherein, transmitting terminal retransmits packet with the HARQ technologies based on STBC and refers to that transmitting terminal sends the common strategic point for the packet that needs are transmitted.
    20. the repeating method according to claim 16-18, wherein, transmitting terminal retransmits packet with the HARQ technologies based on STBC and refers to that transmitting terminal sends the orthogonal sequence corresponding to the packet that needs are transmitted.
    21. a kind of reception feedback method of adaptive HARQ, this method includes：
    Receiving terminal receives the packet；
    Receiving terminal judges to receive number of times, detected according to number of times determination data bag is received；
    According to the packet testing result message different with number of times feedback is received to transmitting terminal.
    22. reception feedback method according to claim 21, wherein,
    The receiving terminal judges to receive number of times, included according to the detection of number of times determination data bag is received：If it is 0 to receive number of times, directly received data packet is decoded；Otherwise by the packet and the preceding packet received several times of this reception, joint is decoded after symbol level merging.
    23. reception feedback method according to claim 22, wherein described packet and the preceding packet received several times by this reception joint after symbol level merging carries out decoding and refers to respectively to eliminate the preceding packet received several times to decode carrying out symbol level with the packet of this reception after correct packet and merging, and joint is decoded after symbol level merges.
    24. the reception feedback method according to claim 22 or 23, wherein, included according to the message that packet testing result is different with number of times feedback is received to transmitting terminal：
    If decoded packet data is correct, one ACK message of feedback receives number of times and is set to 0 to transmitting terminal;
    If decoded packet data mistake, judge
    If receiving number of times reaches a setting value, a NAK message is fed back to transmitting terminal, Receive number of times and be set to 0;
    If receiving number of times is less than setting value, store the packet of reception, will receive number of times add 1 also,
    If it is 1 to receive number of times, receiving terminal sends a NAK message to transmitting terminal；If receiving number of times is more than 1, calculates a pre-coding matrix and feed back the pre-coding matrix index and a NAK message to transmitting terminal.
    25. reception feedback method according to claim 24, wherein,
    The message different with number of times feedback is received according to packet testing result further comprises to transmitting terminal if decoded packet data mistake, receives number of times and is less than a setting value, receiving terminal also sends a data bag decoding error information to transmitting terminal.
    26. the reception feedback method according to claim 24-25, wherein, one pre-coding matrix of the calculating is to be based on maximum S/N R criterions, calculates the pre-coding matrix of optimization.
    27. reception feedback method according to claim 26, wherein, the packet of reception is combined into progress symbol level merging by retransmitting received packet and next time, pre-coding matrix is calculated under output signal-to-noise ratio SNR criterion after symbol level merges maximizing.
    28. reception feedback method according to claim 27, wherein, will received packet and next time retransmit by the packet of reception combine progress symbol level merge refer to by received packet eliminate respectively after decoded correct packet with next time retransmit by the packet of reception combine carry out symbol level merging.
    29. the reception feedback method according to claim 24-28, wherein, the setting value refers to the maximum retransmission of default.
    30. a kind of retransmission arrangement of adaptive HARQ, the device includes：
    Transmitting element, for sending packet；
    Receiving unit, for receiving feedback message；
    Judging unit, for judging feedback message and number of retransmissions；
    Processing unit, for determining retransmission scheme according to feedback message and number of retransmissions and retransmitting content.
    31. retransmission arrangement according to claim 30, wherein,
    It is described to determine that retransmission scheme and re-transmission content include according to feedback message and number of retransmissions： If receiving ACK message, new data packets are sent, number of retransmissions is set to 0;
    If receiving NAK message, number of retransmissions plus 1 and number of retransmissions is judged：
    If number of retransmissions is 1, the packet that the packet of first time transmission is transmitted as this, and packet is retransmitted to receiving terminal, the re-transmission packet and the packet one STBC code word of formation sent for the first time with the HARQ technologies based on STBC；
    If number of retransmissions is not more than a default value, the packet that the packet of first time transmission is transmitted as this, and the pre-coding matrix index selection pre-coding matrix in feedback message, to being retransmitted after the packet progress precoding of this transmission to receiving terminal；
    If number of retransmissions is more than a default value, new data packets are sent, number of retransmissions is set to 0;
    32. retransmission arrangement according to claim 31, if wherein receiving NAK message, the packet of first time transmission is referred to be disappeared according to feedback as this packet transmit ' the packet of packet error information selection needs re-transmission in breath and the packet that is used as this to transmit.
    33. retransmission arrangement according to claim 32, wherein, the packet of this transmission further comprises new data packets.
    34. the retransmission arrangement according to claim 31-33, wherein, the common strategic point that packet refers to send the packet of needs transmission is retransmitted with the HARQ technologies based on STBC.
    35. the retransmission arrangement according to claim 31-33, wherein, packet is retransmitted with the HARQ technologies based on STBC and refers to send the orthogonal sequence corresponding to the packet that needs are transmitted.
    36. a kind of reception feedback device of adaptive HARQ, the device includes：
    Receiving unit, for receiving the packet；
    Judging unit, for judging to receive number of times and packet decoding cases；
    Data packet detecting unit member, for according to reception number of times determination data bag detection；
    Feedback unit, for according to packet testing result with receive that number of times feedback is different disappears
    37. according to the reception feedback device of claim 36, wherein,
    It is described to be included according to reception number of times determination data bag detection：If it is 0 to receive number of times, directly Connect and received data packet is decoded；Otherwise by the packet and the preceding packet received several times of this reception, joint is decoded after symbol level merging.
    38. the reception feedback device according to claim 37, wherein described packet and the preceding packet received several times by this reception joint after symbol level merging carries out decoding and refers to respectively to eliminate the preceding packet received several times to decode carrying out symbol level with the packet of this reception after correct packet and merging, and joint is decoded after symbol Grade merges.
    39, according to the reception feedback device of claim 37 or 38, wherein,
    Included according to the message that packet testing result is different with number of times feedback is received：
    If decoded packet data is correct, an ACK message is fed back, number of times is received and is set to 0;If decoded packet data mistake, judge
    If receiving number of times reaches a setting value, a NAK message is fed back, number of times is received and is set to 0;
    If receiving number of times is less than setting value, store the packet of reception, will receive number of times add 1 also,
    If it is 1 to receive number of times, receiving terminal sends a NAK message；
    If receiving number of times is more than 1, calculates a pre-coding matrix and feed back the pre-coding matrix index and a NAK message.
    40. the reception feedback device according to claim 39, wherein, the message different according to reception number of times feedback further comprise if decoded packet data mistake, receive number of times and are less than a setting value, also send a data bag decoding error information.
    41. the reception feedback device according to claim 39-40, wherein, one pre-coding matrix of the calculating is to be based on maximum S/N R criterions, calculates the pre-coding matrix of optimization.
    42. reception feedback device according to claim 41, wherein, the packet of reception is combined into progress symbol level merging by retransmitting received packet and next time, pre-coding matrix is calculated under output signal-to-noise ratio S NR criterion after symbol level merges maximizing.
    43. reception feedback device according to claim 42, wherein, will received packet and next time retransmit by the packet of reception combine progress symbol level merge refer to by received packet eliminate respectively after decoded correct packet with next time retransmit will connect The packet joint of receipts carries out symbol level merging.
    44. the reception feedback device according to claim 39-43, wherein, the setting value refers to the maximum retransmission of default.
    45. a kind of network side equipment of use adaptive HARQ, wherein, the network side equipment includes the retransmission arrangement as any one of claim 30-35.
    46. the terminal device of-kind of use adaptive HARQ, wherein, the terminal device includes the retransmission arrangement as any one of claim 30-35.
    47. a kind of network side equipment of use adaptive HARQ, wherein, the network side equipment includes the reception feedback device as any one of claim 36-44.
    48. the terminal device of-kind of use adaptive HARQ, wherein, the terminal device includes the reception feedback device as any one of claim 36-44.
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