CN103401666A - Method and device for data retransmission - Google Patents
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Abstract
The invention provides a method and a device for data retransmission in an embodiment. Data is transmitted to at least two stations through access point equipment by adopting the SDMA (space division multiple address) technology; feedback information transmitted by the at least two stations is received; and whether data of each of the stations is retransmitted or not is determined according to the feedback information of each of the stations. Whether the data of each of the stations is retransmitted or not is determined according to the feedback information of each of the stations independently without relying on other stations, so that unnecessary retransmission can be reduced, interferences of data transmission are decreased, and the network signalling load is reduced.
Description
Technical field
The embodiment of the present invention relates to the communication technology, relates in particular to a kind of data repeating method and device.
Background technology
Multi-user's multiple-input and multiple-output (Multiple-user Multiple-input Multiple-output, hereinafter to be referred as: MU-MIMO) or be called space division multiplexing access (Space Division Multiple Access, hereinafter to be referred as: SDMA) technology has the throughput that can improve system with it and the advantage of the availability of frequency spectrum is widely applied.
The core that the SDMA technology realizes is the application of smart antenna.Ideally, it requires the antenna of network equipment spot beam of each website distribution to this network equipment service.With access point (Access Point, hereinafter to be referred as: AP) for instance, AP can distinguish according to the locus of website the wireless signal of each website.In other words, the website that is in diverse location can use at one time same frequency and same pattern and can the phase mutual interference.
Yet, retransmission mechanism under existing SDMA technology for the communication quality data transmission fault information that website feeds back preferably in the website that receives its service as AP after, AP will be to whole website data retransmissions of its service, and this easily causes data transmission interference, and has increased the network signal load.
Summary of the invention
The embodiment of the present invention provides a kind of data repeating method and device and system, to reduce the interference of transfer of data.
Embodiment of the present invention first aspect provides a kind of data repeating method, comprising:
Adopt space division multiplexing access SDMA technology to send data at least two websites;
Receive the feedback information that described at least two websites send respectively;
According to the feedback information of described at least two websites, determine whether to retransmit the data of each website respectively.
In conjunction with first aspect, in the possible implementation of the first, described feedback information is that piece is confirmed BA information.
In conjunction with the possible implementation of the first, in the possible implementation of the second, in described BA information, comprise bit diagram;
Described respectively according to the feedback information of described at least two websites, determine whether that the data that retransmit each website comprise:
The bit diagram that comprises in the BA information that sends according to described at least two websites respectively, determine the Packet Error Ratio PER of the data of each website;
Determine to retransmit the data greater than website corresponding to the PER of predetermined threshold value.
In conjunction with first aspect, in the third possible implementation, described feedback information is for confirming ACK information.
In conjunction with the third possible implementation, in the 4th kind of possible implementation, described respectively according to the feedback information of described at least two websites, determine whether that the data that retransmit each website comprise:
If receive the ACK that website sends, determine not retransmit the data of the website that sends described ACK.
In conjunction with four kinds of possible implementations of the first to the of first aspect or first aspect, in the 5th kind of possible implementation, after determining to need the data of the website that retransmits, also comprise:
The data of obtaining the website that needs are retransmitted retransmit the new pre-coding matrix that adopts;
The described described new pre-coding matrix of the data of the website that retransmits that needs is carried out to precoding processing;
To adopt described new pre-coding matrix to carry out the data re-transmission of the website that the needs after precoding processing retransmit to receiving terminal.
In conjunction with the 5th kind of possible implementation, in the 6th kind of possible implementation, the described data of obtaining the website that needs are retransmitted retransmit the new pre-coding matrix that adopts, and comprising: the website that retransmits as required recalculates and obtains new pre-coding matrix; Perhaps,
In the pre-coding matrix that last data transfer is adopted, need the row that the website that retransmits is corresponding, constitute jointly new pre-coding matrix; Perhaps,
Multiplexing previous pre-coding matrix.
Embodiment of the present invention second aspect provides a kind of data re-transmission device, comprising:
Sending module, send data be used to adopting space division multiplexing access SDMA technology at least two websites;
Receiver module, the feedback information that sends respectively be used to receiving described at least two websites;
Determine the re-transmission policy module, for respectively, according to the feedback information of described at least two websites, determine whether to retransmit the data of each website.
In conjunction with second aspect, in the possible implementation of the first, described feedback information is that piece is confirmed BA information.
In conjunction with the possible implementation of the first, in the possible implementation of the second, in described BA information, comprise bit diagram;
The bit diagram that described definite re-transmission policy module specifically comprises for the BA information that sends according to described at least two websites respectively, determine the Packet Error Ratio PER of the data of each website; Determine to retransmit the data greater than website corresponding to the PER of predetermined threshold value.
In conjunction with second aspect, in the third possible implementation, described feedback information is for confirming ACK information.
In conjunction with the third possible implementation, in the 4th kind of possible implementation, if described definite re-transmission policy module determines not retransmit the data of the website that sends described ACK specifically for receiving the ACK of website transmission.
In conjunction with four kinds of possible implementations of the first to the of second aspect or second aspect, in the 5th kind of possible implementation, described device also comprises: obtain pre-coding matrix module and precoding processing module;
Wherein, the described pre-coding matrix module of obtaining, for after determining to retransmit the data of website, the data of obtaining the website that needs are retransmitted retransmit the new pre-coding matrix that adopts;
Described precoding processing module, for carrying out precoding processing to the described described new pre-coding matrix of the data of the website that retransmits that needs;
Described sending module will be also for adopting described new pre-coding matrix to carry out the data re-transmission of the website that the needs after precoding processing retransmit to receiving terminal.
In conjunction with the 5th kind of possible implementation, in the 6th kind of possible implementation, the described pre-coding matrix module of obtaining specifically recalculates and obtains new pre-coding matrix for the website that retransmits as required; Perhaps,
The described pre-coding matrix module of obtaining specifically needs for the pre-coding matrix that last data transfer is adopted the row that the website that retransmits is corresponding, constitutes jointly new pre-coding matrix; Perhaps,
The described pre-coding matrix module of obtaining is specifically for multiplexing previous pre-coding matrix.
The data repeating method that the embodiment of the present invention provides and device, adopt the SDMA technology to send data at least two websites by access point apparatus; Receive at least two feedback informations that website sends respectively; Respectively according to the website feedback information of described at least two websites, determine whether to retransmit the data of each website, because being determines independently according to the feedback information of each website whether the data of each website self retransmit, do not rely on other websites, therefore, can reduce unnecessary re-transmission, reduce data transmission interference, reduce the network signal load.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing
Fig. 1 is the schematic flow sheet of data repeating method embodiment mono-of the present invention;
Fig. 2 is the schematic flow sheet of data repeating method embodiment bis-of the present invention;
Fig. 3 is the structural representation of data re-transmission device embodiment mono-of the present invention;
Fig. 4 is the structural representation of data re-transmission device embodiment bis-of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment that obtains, belong to the scope of protection of the invention.
Fig. 1 is the schematic flow sheet of data repeating method embodiment mono-of the present invention, as shown in Figure 1, the executive agent of the present embodiment be access point (Access Point, hereinafter to be referred as AP) equipment, the step of the present embodiment comprises:
S101: adopt the SDMA technology to send data at least two websites.
In the SDMA system, an AP is in the website transmission data of same running time-frequency resource to two or more, to improve mouthful amount and the availability of frequency spectrum of gulping down of system.
S102: receive at least two feedback informations that website sends respectively.
Website can carry out verification to received data after receiving the data of AP transmission, and feedback sends to AP, AP to receive the feedback information of each website using check results as feedback information.
S103: respectively according to the feedback information of above-mentioned at least two websites, determine whether to retransmit the data of each website.
AP determines whether respectively to retransmit the data of each website according to the feedback information of each website.
as a kind of feasible implementation, for supporting polymerization media access control protocol data unit (Aggregate MAC Protocol Data Unit, hereinafter to be referred as: the website that AMPDU) sends, AP is AMPDU to the data that website sends, after website receives one's own AMPDU, each MPDU in AMPDU is carried out to CRC check, with the MPDU that determines to receive correct MPDU and receive mistake, and according to the correctness of MPDU, generate bit diagram (bitmap), wherein, whether bit diagram is correct in order to each MPDU of the AMPDU that indication receives, MPDU of each bit indication, with bit " 1 " expression, receive correct, bit " 0 " expression receives mistake, above-mentioned bit diagram is carried to piece and confirms (Block Acknowledgement, hereinafter to be referred as: BA), as feedback information, send to AP.
Correspondingly, after AP receives the BA information that comprises bit diagram, according to the Packet Error Ratio of the bit diagram calculated data in BA (Packet error rate, hereinafter to be referred as: PER), wherein,
If PER is greater than predetermined threshold value, determine to retransmit greater than threshold value the data of the corresponding website of PER, the span of threshold value is between 0 to 1, typical value is 0.5.
As the feasible implementation of another kind, for the website of not supporting that AMPDU sends, AP is MPDU to the data that website sends, after website receives one's own MPDU, carry out CRC check, if pass through CRC check, will confirm (Acknowledgement, hereinafter to be referred as: ACK) information sends to AP as feedback information, after AP receives ACK, determines not retransmit the data of the website that sends above-mentioned ACK.If data are not passed through CRC check, will deny (Negative ACKnowledgment, hereinafter to be referred as: NACK) information sends to AP as feedback information, be understandable that, if data are not passed through CRC check, also can not send any information to AP, if AP is after sending data in the scheduled time, do not receive the ACK information that website sends, be equivalent to inform that the data of this website of AP do not pass through CRC check, namely do not send any information identical with the effect that sends NACK, all be equivalent to inform that the data that this website of AP receives do not pass through CRC check.
Correspondingly, if AP receives NACK or do not receive any information, determine to retransmit the data that send NACK or do not send the website of any information.
As another feasible implementation, AP sends feedback request information to website, website is after the feedback request information that receives the AP transmission, send feedback information, for example, receive piece confirm request (Block Acknowledgement Request, hereinafter to be referred as: BAR) after information, then send BA information or ACK information to AP.
Correspondingly, if AP receives BA information, further calculate PER, as PER during higher than threshold value, the data of this website are retransmitted, if AP does not receive BA information, the data of this website retransmitted, perhaps, if AP, without any information, retransmits the data of the website that do not receive.
The present invention does not limit the send mode of feedback information and the concrete form of feedback information.
The present embodiment, adopt the SDMA technology to send data at least two websites by access point apparatus; Receive at least two feedback informations that website sends respectively; Respectively according to the feedback information of at least two websites, determine whether to retransmit the data of each website, because being determines independently according to the feedback information of each website whether the data of each website self retransmit, do not rely on other websites, therefore, can reduce unnecessary re-transmission, reduce data transmission interference, reduce the network signal load.
Fig. 2 is the schematic flow sheet of data repeating method embodiment bis-of the present invention, and as shown in Figure 2, the method for the present embodiment comprises:
S201:AP adopts the SDMA technology to send data at least two websites.
This step is similar with S101, does not repeat them here.
S202: website receives the data that AP sends, and according to the data that receive, carries out verification, and, according to check results, generates feedback information.
Particularly, website carries out verification to the data that receive, and for example, carries out CRC check, obtains the CRC check result.
if the website of website for supporting that AMPDU sends, this step is specially website each MPDU in the AMPDU that receives is carried out to CRC check, with the MPDU that determines to receive correct MPDU and receive mistake, and according to the correctness of MPDU, generate bit diagram (bitmap), wherein, whether bit diagram is correct in order to each MPDU of the AMPDU that indication receives, MPDU of each bit indication, with bit " 1 " expression, receive correct, bit " 0 " expression receives mistake, above-mentioned bit diagram is carried to piece and confirms (Block Acknowledgement, hereinafter to be referred as: BA), as feedback information.if the website of website for not supporting that AMPDU sends, after this step is specially website and receives one's own MPDU, carry out CRC check, if pass through CRC check, will confirm (Acknowledgement, hereinafter to be referred as: ACK) information is as feedback information, if data are not passed through CRC check, will deny (Negative ACKnowledgment, hereinafter to be referred as: NACK) information is as feedback information, be understandable that, if data are not passed through CRC check, also can not send any information to AP, if AP is after sending data in the scheduled time, do not receive the ACK information that website sends, be equivalent to inform that the data of this website of AP do not pass through CRC check, namely do not send any information identical with the effect that sends NACK, all be equivalent to inform that the data that this website of AP receives do not pass through CRC check, namely do not send any information and can be used as a kind of feedback information yet.
S203: website sends to AP by feedback information.
With S202 correspondingly, if the user of website for supporting that AMPDU sends, the BA information that will comprise bit diagram sends to AP as feedback information.
If the user is the user for not supporting that AMPDU sends, if check results is for passing through CRC check, ACK information is sent to AP as feedback information, if check results sends to NACK AP or do not send any information to AP for not by CRC check as feedback information.
S204:AP receives the feedback information that at least two websites send;
S205:AP determines whether respectively to retransmit the data of each website according to the feedback information of each website.
If feedback information is the BA information that comprises bit diagram, after AP receives the BA information that comprises bit diagram, according to the Packet Error Ratio of the bit diagram calculated data in BA (Packet error rate, hereinafter to be referred as: PER), wherein,
Determine PER is retransmitted greater than the data of the website of threshold value, the span of threshold value is between 0 to 1, and typical value is 0.5.
If feedback information is ACK, nack message, if AP receives NACK or do not receive any information, determine to retransmit the data that send NACK or do not send the website of any information.
Alternatively, before carrying out this step, also comprise and judge whether to surpass maximum retransmission, if surpass maximum retransmission, no longer data are retransmitted, and starting to transmit new data, this is because some user has requirement to time delay, if surpass the maximum transmitted time delay, even retransmit also nonsensical, therefore, by judging whether to surpass maximum retransmission, can reduce further unnecessary re-transmission.
S206: the data of obtaining the website that needs are retransmitted retransmit the new pre-coding matrix that adopts.Alternatively, can determine to retransmit pre-coding matrix according to previous pre-coding matrix.
As a kind of feasible implementation, in the pre-coding matrix that last data transfer is adopted, need the row that the website that retransmits is corresponding, constitute jointly the pre-coding matrix of re-transmission, for example, frontly can represent with following formula (1) while once transmitting data:
Wherein, the F matrix is pre-coding matrix, and the contigency corresponding by each website is combined into, and the H matrix is channel matrix, the Y matrix is the data that receive, the initial data of X matrix for sending, Nss1, Nss2, Nss3 represents respectively website 1, website 2, the space fluxion of website 3; Y1, Y2, Y3 represent respectively website 1, website 2, the reception signal of each antenna of website 3, Ntx represents the number of transmit antennas of SDMA transmitter; Nrx1, Nrx2, Nrx3 represent website 1, website 2, the reception antenna number of website 3, Rx=Nrx1+Nrx2+Nrx3, Tx=Ntx.
If according to the step in S205, determine to retransmit the data of website 1 and website 3, website 2 does not need to retransmit, in the pre-coding matrix that adopts according to last data transfer, need the row that the website that retransmits is corresponding, constitute jointly the pre-coding matrix of re-transmission, namely, directly from original pre-coding matrix, extract the new pre-coding matrix of corresponding column weight structure, can represent with following formula (2):
Wherein, in formula (2) with formula (1) in identical label represent identical implication, repeat no more herein.
As the feasible implementation of another kind, direct multiplexing previous pre-coding matrix, by X1 to be retransmitted, X3 or new X1, the X3 data Replica, to the position at the original place of X2, sends after the employing precoding processing, can represent with following formula (3).
Wherein, in formula (3) with formula (1) in identical label represent identical implication, repeat no more herein.
This step, by according to previous pre-coding matrix specified data, retransmitting the pre-coding matrix of the re-transmission of required employing, makes amount of calculation reduce to a great extent, has improved precoding efficiency.
Certainly, in the situation that do not consider amount of calculation, this step also can, under the condition of not utilizing last pre-coding matrix, recalculate pre-coding matrix; Specific as follows:
Suppose to have the data of K website to need to retransmit, wherein, the V matrix of each website is respectively V
1, V
2... V
k, V
K.1≤k≤K, for k user, structural matrix
H represents transposition, carries out the SVD decomposition and obtains:
Further right
Carry out the SVD decomposition:
S207: the described described new pre-coding matrix of the data of the website that retransmits that needs is carried out to precoding processing.
S208: will adopt described new pre-coding matrix to carry out the data re-transmission of the website that the needs after precoding processing retransmit to receiving terminal.In the present embodiment, by access point apparatus, adopt the SDMA technology to send data at least two websites; Receive at least two feedback informations that website sends respectively; Respectively according to the feedback information of at least two websites, determine whether to retransmit the data of each website, because being determines independently according to the feedback information of each website whether the data of each website self retransmit, do not rely on other websites, therefore, can reduce unnecessary re-transmission, reduce data transmission interference, reduce the network signal load, and, after determining re-transmission, can determine to retransmit pre-coding matrix according to previous pre-coding matrix, to a certain extent less amount of calculation, improved precoding efficiency.
Fig. 3 is the structural representation of data re-transmission device embodiment mono-of the present invention, as shown in Figure 3, the device of the present embodiment comprises: sending module 31, receiver module 32 and definite re-transmission policy module 33, wherein, sending module 31 is be used to adopting space division multiplexing access SDMA technology to send data at least two websites; Receiver module 32 is for receiving at least two feedback informations that website sends respectively; Determine re-transmission policy module 33 for respectively according to the feedback information of at least two websites, determine whether to retransmit the data of each website.
The device of the present embodiment, can be used for carrying out the technical scheme of embodiment of the method shown in Figure 1, its realize principle and technique effect similar, repeat no more herein.
In the above-described embodiments, feedback information is that piece is confirmed BA information.
In the above-described embodiments, in BA information, comprise bit diagram;
Determine the bit diagram that re-transmission policy module 33 specifically comprises for the BA information that sends according at least two websites respectively, determine the Packet Error Ratio PER of the data of each website; Determine to retransmit the data greater than website corresponding to the PER of predetermined threshold value.
In the above-described embodiments, feedback information is for confirming ACK information.
In the above-described embodiments, if determine the specifically ACK for receiving that website sends of re-transmission policy module 33, determine not retransmit the data of the website that sends ACK.
Fig. 4 is the structural representation of data re-transmission device embodiment bis-of the present invention, as shown in Figure 3, the device of the present embodiment comprises: Fig. 4 is on basis embodiment illustrated in fig. 3, further, also comprise: obtain pre-coding matrix module 34 and precoding processing module 35, wherein, obtain pre-coding matrix module 34 for after determining to retransmit the data of website, the data of obtaining the website that needs are retransmitted retransmit the new pre-coding matrix that adopts; Precoding processing module 35 is carried out precoding processing for the new pre-coding matrix of the data of the website to the needs re-transmission; Sending module 31 will be also for adopting new pre-coding matrix to carry out the data re-transmission of the website that the needs after precoding processing retransmit to receiving terminal.
In the above-described embodiments, obtaining pre-coding matrix module 34 specifically recalculates and obtains new pre-coding matrix for the website that retransmits as required; Perhaps,
Obtaining pre-coding matrix module 34 specifically needs for the pre-coding matrix that last data transfer is adopted the row that the website that retransmits is corresponding, constitutes jointly new pre-coding matrix; Perhaps,
Obtain pre-coding matrix module 34 specifically for multiplexing previous pre-coding matrix.
The device of the present embodiment, can be used for carrying out the technical scheme of embodiment of the method shown in Figure 2, its realize principle and technique effect similar, repeat no more herein.
Those skilled in the art can be well understood to, for convenience and simplicity of description, only the division with above-mentioned each functional module is illustrated, in practical application, can above-mentioned functions be distributed and by different functional modules, completed as required, the internal structure that is about to device is divided into different functional modules, to complete all or part of function described above.The specific works process of the device of foregoing description, can, with reference to the corresponding process in preceding method embodiment, not repeat them here.
Finally it should be noted that: above each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to aforementioned each embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, or some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.
Claims (14)
1. a data repeating method, is characterized in that, comprising:
Adopt space division multiplexing access SDMA technology to send data at least two websites;
Receive the feedback information that described at least two websites send respectively;
According to the feedback information of described at least two website websites, determine whether to retransmit the data of each website respectively.
2. method according to claim 1, is characterized in that, described feedback information is that piece is confirmed BA information.
3. method according to claim 2, is characterized in that, in described BA information, comprises bit diagram;
Described respectively according to the feedback information of described at least two websites, determine whether that the data that retransmit each website comprise:
The bit diagram that comprises in the BA information that sends according to described at least two websites respectively, determine the Packet Error Ratio PER of the data of each website;
Determine to retransmit the data greater than website corresponding to the PER of predetermined threshold value.
4. method according to claim 1, is characterized in that, described feedback information is for confirming ACK information.
5. method according to claim 4, is characterized in that, and is described respectively according to the feedback information of described at least two websites, determines whether that the data that retransmit each website comprise:
If receive the ACK that website sends, determine not retransmit the data of the website that sends described ACK.
6. the described method of any one according to claim 1-5, is characterized in that, after determining to need the data of the website that retransmits, also comprises:
The data of obtaining the website that needs are retransmitted retransmit the new pre-coding matrix that adopts;
The described described new pre-coding matrix of the data of the website that retransmits that needs is carried out to precoding processing;
To adopt described new pre-coding matrix to carry out the data re-transmission of the website that the needs after precoding processing retransmit to receiving terminal.
7. method according to claim 6, is characterized in that, the described data of obtaining the website that needs are retransmitted retransmit the new pre-coding matrix that adopts, and comprising: the website that retransmits as required recalculates and obtains new pre-coding matrix; Perhaps,
In the pre-coding matrix that last data transfer is adopted, need the row that the website that retransmits is corresponding, constitute jointly new pre-coding matrix; Perhaps,
Multiplexing previous pre-coding matrix.
8. a data re-transmission device, is characterized in that, comprising:
Sending module, send data be used to adopting space division multiplexing access SDMA technology at least two websites;
Receiver module, the feedback information that sends respectively be used to receiving described at least two websites;
Determine the re-transmission policy module, for respectively, according to the feedback information of described at least two websites, determine whether to retransmit the data of each website.
9. device according to claim 8, is characterized in that, described feedback information is that piece is confirmed BA information.
10. device according to claim 9, is characterized in that, in described BA information, comprises bit diagram;
The bit diagram that described definite re-transmission policy module specifically comprises for the BA information that sends according to described at least two websites respectively, determine the Packet Error Ratio PER of the data of each website; Determine to retransmit the data greater than website corresponding to the PER of predetermined threshold value.
11. device according to claim 8, is characterized in that, described feedback information is for confirming ACK information.
12. device according to claim 11, is characterized in that, if described definite re-transmission policy module determines not retransmit the data of the website that sends described ACK specifically for receiving the ACK of website transmission.
13. according to claim 8-12, the described device of any one, is characterized in that, also comprises: obtain pre-coding matrix module and precoding processing module;
Wherein, the described pre-coding matrix module of obtaining, for after determining to retransmit the data of website, the data of obtaining the website that needs are retransmitted retransmit the new pre-coding matrix that adopts;
Described precoding processing module, for carrying out precoding processing to the described described new pre-coding matrix of the data of the website that retransmits that needs;
Described sending module will be also for adopting described new pre-coding matrix to carry out the data re-transmission of the website that the needs after precoding processing retransmit to receiving terminal.
14. device according to claim 13, is characterized in that, the described pre-coding matrix module of obtaining specifically recalculates and obtains new pre-coding matrix for the website that retransmits as required; Perhaps,
The described pre-coding matrix module of obtaining specifically needs for the pre-coding matrix that last data transfer is adopted the row that the website that retransmits is corresponding, constitutes jointly new pre-coding matrix; Perhaps,
The described pre-coding matrix module of obtaining is specifically for multiplexing previous pre-coding matrix.
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| CN106656431A (en) * | 2015-09-21 | 2017-05-10 | 华为技术有限公司 | Message transmission method and user equipment |
| WO2017177805A1 (en) * | 2016-04-13 | 2017-10-19 | 电信科学技术研究院 | Method for data retransmission through multi-flow space division multiplexing, transmitting end, receiving end and storage medium |
| CN107547176A (en) * | 2016-06-24 | 2018-01-05 | 北京信威通信技术股份有限公司 | A kind of method and device for retransmitting data |
| WO2020238314A1 (en) * | 2019-05-27 | 2020-12-03 | 华为技术有限公司 | Method and apparatus used for retransmission |
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| CN105450429B (en) * | 2015-12-30 | 2019-03-29 | 海能达通信股份有限公司 | Data transmission method, device, system and communication equipment |
| WO2017177805A1 (en) * | 2016-04-13 | 2017-10-19 | 电信科学技术研究院 | Method for data retransmission through multi-flow space division multiplexing, transmitting end, receiving end and storage medium |
| CN107302422A (en) * | 2016-04-13 | 2017-10-27 | 电信科学技术研究院 | The data repeating method and equipment of a kind of multithread space division multiplexing |
| CN107547176A (en) * | 2016-06-24 | 2018-01-05 | 北京信威通信技术股份有限公司 | A kind of method and device for retransmitting data |
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