CN101562507B - Data transmission method - Google Patents
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- CN101562507B CN101562507B CN 200810088686 CN200810088686A CN101562507B CN 101562507 B CN101562507 B CN 101562507B CN 200810088686 CN200810088686 CN 200810088686 CN 200810088686 A CN200810088686 A CN 200810088686A CN 101562507 B CN101562507 B CN 101562507B
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15521—Ground-based stations combining by calculations packets received from different stations before transmitting the combined packets as part of network coding
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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
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0097—Relays
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Abstract
The invention discloses a data transmission method, comprising the following steps: a relay node judges if data a from a node A and data b from a node B are accurately received; if so, the relay node sends accurate relay node receiving feedback to the node A and the node B, respectively carries out network coding for the data a and the data b, sends the coded data a and data receiving notificationto the node B and sends the coded data b and the data receiving notification to a node a; the node A knows that the relay node accurately receives the data a in such a way that the relay node receive s the accurate feedback, and the node B knows that the relay node accurately receives the data b in such a way that the accurately receives the accurate feedback; after the node A receives the data receiving notification, the node A decodes the coded data b, and the node A sends successful decoding feedback and new data a1 to the relay node under the condition of successful decoding and sends frustrated feedback and the new data a1 to the relay node under the condition of frustrated decoding.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of data transmission method.
Background technology
The design object of wireless multi-hop communication system is under the prerequisite that takes full advantage of limited wireless network resource, makes each receiving node can receive fast complete information.Network code is exactly a kind of technology wherein.From broadly, network code is the multileaving technology that forwards again after the node in the network is encoded the information that receives.The example of a network code and traditional transfer is to such as shown in Fig. 1 a and Fig. 1 b.Fig. 1 a is the example of traditional transfer, and node A sends to relaying R to data a, and then Node B sends to relaying R to data.R sends to data b node A and data a is sent to Node B successively.Through the transmission of 4 links, A and B can receive data b and a separately like this.And in Fig. 1 b, the application network coding techniques carries out network code (for example XOR) with data a and the data b received, coded data is gone out with same time and frequency resource (being the same link) multicast again.Node A can solve needed data b (network decoding) with the data a that oneself sends according to the information that receives.Equally, Node B can solve needed data a with the data b that oneself sends according to the information that receives.Like this, adopted (seeing shown in Fig. 1 b) behind the network coding technique, only needed to use 3 links just can realize all communicating requirements of traditional approach.
But, in the prior art, do not have the rear multihop relay system of a kind of method definition Adoption Network coding and should how to realize feedback.。For example, if relaying R does not correctly receive the data that node A or Node B send and should how to process? should can't how even R has correctly received the data that node A and Node B send, but node A or Node B also be carried out network decoding and to be processed again? therefore need a kind of technology to address these problems.
Summary of the invention
One or more problems in view of the above the invention provides a kind of data transmission method.
Data transmission method according to the embodiment of the invention comprises: whether relay node judges it correctly received from the data a of node A with from the data b of Node B; If judged result is yes, then via node sends the correct feedback of via node reception to node A and Node B respectively, correctly to have received respectively data a and data b to node A and Node B indication via node, or via node sends the correct feedback of via node reception correctly to have received respectively data b and data a to node A and Node B indication via node to node A and Node B respectively, and respectively data a and data b are carried out network code, data a behind the coding and data receiver notice are sent to Node B, the data b behind the coding and data receiver notice are sent to node a; Node A receives correct feedback acquiring relay node by via node and has correctly received data a, and Node B receives correct feedback acquiring relay node by via node and correctly received data b.After node A receives the data receiver notice, data b behind the coding is decoded, in the situation that successfully decoded is sent to via node with successfully decoded feedback and new data a1, in the situation that decode unsuccessfully, feedback and new data a1 are sent to via node with decoding unsuccessfully.After Node B receives the data receiver notice, data a behind the coding is decoded, in the situation that successfully decoded is sent to via node with successfully decoded feedback and new data b 1, in the situation that decode unsuccessfully, feedback and new data b 1 are sent to via node with decoding unsuccessfully.
Wherein, in the situation that node A decodes unsuccessfully, the Node B successfully decoded, also comprise: whether relay node judges has correctly received new data a1 and new data b 1; In the situation that judged result is yes, via node does not carry out network code to data b, send via node to node A and receive correct feedback correctly to have received new data a1 to node A indication via node, and to node A transmission data receiver notice and data b, feed back correctly received new data b 1 to Node B indication via node to the reception of Node B transmission via node is correct, and refuse notice to Node B transmission data.
Wherein, in the situation that node A and Node B successfully decoded all, also comprise: whether relay node judges has correctly received new data a1 and new data b 1; In the situation that judged result is yes, via node carries out network code to new data a1 and new data b 1 respectively, send via node to node A and receive correct feedback correctly to have received new data a1 to node A indication via node, and send data b 1 behind data receiver notice and the coding to node A, send via node to Node B and receive correct feedback correctly having received new data b 1 to Node B indication via node, and send data a1 behind data receiver notice and the coding to Node B.
Wherein, in the situation that node A and Node B are all decoded is failed, also comprise: whether relay node judges has correctly received new data a1 and new data b 1; In the situation that judged result is yes, via node carries out network code to new data a1 and new data b 1 respectively, send via node to node A and receive correct feedback correctly to have received new data a1 to node A indication via node, and send data b behind data receiver notice and the coding to node A, send via node to Node B and receive correct feedback correctly having received new data b 1 to Node B indication via node, and send data a behind data receiver notice and the coding to Node B.
Wherein, in the situation that the correct receive data a of via node, incorrect receive data b, also comprise: via node sends via node to node A and receives correct feedback and data refusal notice, and data a and data receiver notice is sent to Node B, send via node to Node B and receive error feedback with to the correct receive data b of Node B indication via node; And node A sends new data a1 to via node, Node B receives data a, and in the situation that receive successfully, sends and receives successfully feedback and data b to via node, in the situation that take defeat, send and receive unsuccessfully feedback and data b to via node.
Wherein, in the situation that via node is to data a and all incorrect receptions of data b, also comprise: via node sends via node to node A and receives error feedback and data refusal notice with to the correct receive data a of node A indication via node and need not receive data b, sends via node to Node B and receives error feedback and data refusal notice with to the correct receive data b of Node B indication via node and need not receive data a; Node A receives error feedback by via node to be known behind the correct receive data a of node and again sends data a to via node, and Node B sends data b to via node after receiving the correct receive data b of error feedback acquiring relay node by via node again.
In sum, the invention provides the method for feeding back behind the Adoption Network coding in a kind of wireless system.
Wherein, via node can be the base station (BS) in the wireless relay communication system, or relay station (RS), or mobile radio station (MS), and node A and B can be relay station or mobile radio station.
The present invention can be applied in the scene of hybrid automatic retransmission request (ARQ), mixed automatic retransfer request (HARQ).
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of a part of asking in this, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 a and Fig. 1 b are that application is according to the configuration schematic diagram of the wireless relay network of the data transmission method of the embodiment of the invention;
Fig. 2 is the schematic flow sheet of realizing in scene one according to the data transmission method of first embodiment of the invention;
Fig. 3 is the schematic flow sheet of realizing in scene two according to the data transmission method of first embodiment of the invention;
Fig. 4 is the schematic flow sheet of realizing in scene three according to the data transmission method of first embodiment of the invention;
Fig. 5 a and Fig. 5 b are that application is according to the configuration schematic diagram of the wireless relay network of the data transmission method of second embodiment of the invention;
Fig. 6 is at two MS data receivers schematic flow sheet in the successful situation according to the data transmission method of second embodiment of the invention;
Fig. 7 is according to the data transmission method of second embodiment of the invention in the situation that relaying fails correctly to receive the schematic flow sheet of MS data b 0; And
Fig. 8 is according to the data transmission method of second embodiment of the invention in the situation that MS a fails correctly to receive the schematic flow sheet of MS data b 0.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
Data transmission method according to first embodiment of the invention mainly may further comprise the steps (supposing that the transmission of certain node and feedback resources can be determined by this node):
1) via node receives the data of other two nodes transmissions and judges whether to receive successfully.Via node is preserved the data of successfully reception for retransmitting in the future.
2) via node sends two classes feedback and multi-case data to other nodes.Described two classes are fed back to:
I) via node sends via node to sending node and whether correctly receives the data feedback that sending node sends, after sending node is received the receive data feedback of via node transmission, determine to send new data according to feedback, or retransmission data, or do not send any data;
Ii) via node sends other node datas receive success or not at via node feedback for corresponding receiving node, and corresponding receiving node feeds back the multi-case data that determines whether will receive subsequently according to this.If the every other node data of the correct reception of via node, multi-case data is the network code data, otherwise multi-case data just receives successful data.
It should be noted that for certain sending node, as long as the data that oneself sends are correctly fed back by via node, just should send new data.But might also not have to receive data in the past by other nodes this moment, can't receive new data, and new data can only be at the via node buffer memory.Therefore for the requirement of via node be certain buffer memory ability is arranged and receives the buffer memory number of times limited.When reaching thresholding, the buffer memory number of times all should send to block new data to the sending node negative feedback no matter oneself receive correctness.
3) other nodes receive that the via node receive data successfully feeds back, and receive multi-case data, otherwise do not receive multi-case data.
4) after other nodes receive multi-case data, should use to send data decode and send successfully decoded whether feedback to via node at once; If other nodes do not receive multi-case data, do not send out feedback any.
5) after sending node is received the receive data feedback of via node transmission, determine to send new data according to feedback, or retransmission data, or do not send any data;
Every jumping feedback according to the transmission in the method for the embodiment of the invention and feedback channel.I.e. complete transmission and feedback procedure can be by node flexibly according to the actual conditions arrangements.In case like this bust this, re-transmission can get started according to the negative feedback of receiving.
In the method according to the embodiment of the invention, require each node to determine in real time the multi-case data whether decoding of Adoption Network coding/decoding method receives according to control information.
The below is with the details of three kinds of different scene introductions according to the method for the embodiment of the invention.In actual applications, other scenes are the linear combination of these three kinds of scenes, can do overlap-add procedure according to the analysis of these three kinds of scenes.In following three kinds of scene analysis, unless stated otherwise, always tentation data is correctly decoded and always feeds back and is correctly received.
Scene one: all data decodes are success all.
As shown in Figure 2, the data a0 that the correct receiving node A of via node R and B send sends two classes feedback behind the b0.
The first kind is a0 to be received correct feedback send to node A, and the correct feedback of b0 reception is sent to Node B; Equations of The Second Kind is b0 to be received correct feedback send to node A, and a0 is received correct feedback sends to Node B, then utilizes data behind a0 and the b0 network code with same resource multicast transmission.
Merit attention, separately two feedbacks can utilize different time and frequency resource to send in the two classes feedbacks, also can utilize simultaneously different frequency to send.In addition, if whether physical characteristic (for example polarity) sign of the enough signals of energy receives correct, add whether feedack can identify reception correct, a signal can identify two feedbacks, and therefore two feedbacks can also utilize same frequency to send simultaneously.
Node A receives that b0 receives correct feedback, just can receive the network code data and utilize a0 to carry out network decoding; Node B receives that a0 receives correct feedback, just can receive the network code data and utilize b0 to carry out network decoding.
Node A is correctly decoded backward R transmission b0 and correctly receives feedback and send new data a1 (because receiving that relay reception a0 correctly feeds back); Node B is correctly decoded backward R transmission a0 and correctly receives feedback and send new data b 1 (because receiving that relay reception b0 correctly feeds back).
Scene two: via node fails correctly to receive the data that certain other node sends.
As shown in Figure 3, the data a0 that sends of the correct receiving node A of via node R but fail correctly to receive the data b 0 that B sends.R sends two classes feedback.
The first kind is b0 to be received error feedback send to Node B, and the correct feedback of a0 reception is sent to node A; Equations of The Second Kind is b0 to be received error feedback send to node A, and the correct feedback of a0 reception is sent to Node B, then sends the data a0 of correct reception with same resource multicast.
Merit attention, separately two feedbacks can utilize different time and frequency resource to send in the two classes feedbacks, also can utilize simultaneously different frequency to send.In addition, if whether physical characteristic (for example polarity) sign of the enough signals of energy receives correct, add whether feedack can identify reception correct, a signal can identify two feedbacks, and therefore two feedbacks can also utilize same frequency to send simultaneously.
Node A receives that b0 receives error feedback, can not receive multi-case data; Node B receives that a0 receives correct feedback, just can receive multi-case data, this moment Node B not the Adoption Network decoding receive multi-case data.
Node A does not receive multi-case data, does not send out feedback any, but correctly receives the a0 feedback because receive relaying, can send new data a1; Node B is correctly decoded backward R transmission a0 and correctly receives feedback and resend data b 0 (because receiving relay reception b0 error feedback).
If the data a1 that the correct receiving node A of via node R and B send, b0, R will send two classes feedback.The first kind is a1 to be received correct feedback send to node A, and the correct feedback of b0 reception is sent to Node B; Equations of The Second Kind is b0 to be received correct feedback send to node A, and a1 is received correct feedback sends to Node B, then utilizes data behind a1 and the b0 network code with same resource multicast transmission.
Scene three: certain other node fails correctly to receive the network code data that via node sends.
As shown in Figure 4, the data a0 that the correct receiving node A of via node R and B send sends two classes feedback behind the b0.
The first kind is a0 to be received correct feedback send to node A, and the correct feedback of b0 reception is sent to Node B; Equations of The Second Kind is b0 to be received correct feedback send to node A, and a0 is received correct feedback sends to Node B, then utilizes data behind a0 and the b0 network code with same resource multicast transmission.
Merit attention, separately two feedbacks can utilize different time and frequency resource to send in the two classes feedbacks, also can utilize simultaneously different frequency to send.In addition, if whether physical characteristic (for example polarity) sign of the enough signals of energy receives correct, add whether feedack can identify reception correct, a signal can identify two feedbacks, and therefore two feedbacks can also utilize same frequency to send simultaneously.
Node A does not have correctly to receive the network code data that via node is sent, and therefore sending data b 0 does not have the correct feedback that receives, and in addition, correctly receives the a0 feedback because receive via node R, and node A can send new data a1; Node B is correctly decoded backward via node R transmission a0 and correctly receives feedback and send new data b 1 (because having received that via node R receives b0 and correctly feeds back).
If the data a1 that the correct receiving node A of via node R and B send, b1, R are with buffer memory a1, b1 also sends two classes feedback.The first kind is a1 to be received correct feedback send to node A, and the correct feedback of b1 reception is sent to Node B; Equations of The Second Kind is b0 to be received correct feedback send to node A, and a1 is received error feedback sends to Node B.Then send the correct data b 0 that receives with same resource multicast.
Node B receives that a1 receives error feedback, can not receive multi-case data; Node A receives that b0 receives correct feedback, just can receive multi-case data.
It should be noted that the data that this moment, relaying sent are b0 rather than new data a1 and the b1 that receive that retransmit, new data can only be waited at the via node buffer memory and again sending after b0 sends successfully.If receive again a2 and b2 in the b0 process of transmitting, because a1 and the zero clearing of b1 of transmitting terminal can't be decoded by Adoption Network, therefore can only send a1 and b1 separately successively, efficient is very low like this.Therefore for the requirement of via node be certain buffer memory ability is arranged and receives the buffer memory number of times limited.When reaching thresholding, the buffer memory number of times all should send to block new data to the sending node negative feedback no matter oneself receive correctness.
In order to enlarge system ovelay range and to increase power system capacity, one or more relay station (Relay Station, be called for short RS, be via node) be arranged on base station (the Multi-hop Relay Base Station that supports multi-hop relay, be called for short MR-BS) and terminal (MobileStations, abbreviation MS) between.
In according to a second embodiment of the present invention, MS a and MS b have same upstream RS.Therefore, if between MS a and the MS b data interaction is arranged, can be by then not passing through MR-BS among the RS.In centralized control formula network, MR-BS can dispatch the resource of data interaction between the MS, and in the distributed control type network, upstream RS can dispatch the resource of data interaction between the MS.
Fig. 5 a is the example of traditional transfer, and MS a sends to RS to MS data a, and then MS b sends to RS to the MS data b.Then RS sends to MS data a MS b and the MS data b is sent to MS a successively.Can obtain separately data through the transmission MS b of 4 links and MS a like this.And in Fig. 5 b, the application network coding techniques carries out network code (for example XOR) with the MS data b received and MS data a and coded data is sent with same time and frequency resource (being the same link) again.MS a can solve needed MS data b with the MS data a that oneself sends according to the information that receives.Same, MS b can solve needed MS data a with the MS data b that oneself sends according to the information that receives.Like this, adopted (seeing Fig. 5 b) behind the network coding technique, only needed to use 3 links just can realize all communicating requirements of traditional approach.
Describe the embodiment of the invention in detail hereinafter with reference to accompanying drawing, wherein, provide following examples and understand of the present invention to provide comprehensively and thoroughly, rather than the present invention is carried out any restriction.
In the method according to second embodiment of the invention, the RS relaying is from the data of two MS and network code data and the dependent feedback of feedback and transmission oneself.Method according to second embodiment of the invention specifically may further comprise the steps:
1) RS receives the data of MS a and MS b transmission and judges whether to receive successfully.RS preserves the data of successfully reception for retransmitting in the future.
2) RS sends two classes feedback and multi-case data to MS a and MS b.Described two classes are fed back to:
I) RS sends RS to sending node and whether correctly receives the data feedback that sending node sends, and sending node determines to send new data according to feedback after receiving the receive data feedback of via node transmission, or retransmission data, or does not send any data;
Ii) RS sends other node datas receive success or not at RS feedback for corresponding receiving node, and corresponding receiving node feeds back the multi-case data that determines whether will receive subsequently according to this.If the every other node data of the correct reception of RS, multi-case data is the network code data, otherwise multi-case data just receives successful data.
It should be noted that for certain sending node, as long as the data that oneself sends are correctly fed back by RS, just should send new data.But might also not have to receive data in the past by other nodes this moment, can't receive new data, and new data can only be at the via node buffer memory.Therefore for the requirement of via node be certain buffer memory ability is arranged and receives the buffer memory number of times limited.When reaching thresholding, the buffer memory number of times all should send to block new data to the sending node negative feedback no matter oneself receive correctness.
3) MS a or MS b receive that the RS receive data successfully feeds back, and receive multi-case data, otherwise do not receive multi-case data.
4) after MS a or MS b receive multi-case data, should use to send data decode and send successfully decoded whether feedback to RS; If MS a or MS b do not receive multi-case data, do not send out feedback any.
5) after MS a or MS b receive the receive data feedback of RS transmission, determine to send new data according to feedback, or retransmission data, or do not send any data.
Every jumping feedback according to the transmission in the method for second embodiment of the invention and feedback channel.I.e. complete transmission and feedback procedure can be flexibly according to the actual conditions arrangements.In case like this bust this, re-transmission can get started according to the negative feedback of receiving.
Wherein, require each node to determine in real time the multi-case data whether decoding of Adoption Network coding/decoding method receives according to control information.For example, can identify this packet with a bit in front in multicast packets and whether adopt network code.
The below introduces the details of this method with three kinds of different scenes.In actual applications, other scenes are the linear combination of these three kinds of scenes, can do overlap-add procedure according to the analysis of these three kinds of scenes.In following three kinds of scene analysis, unless stated otherwise, always tentation data is correctly decoded and always feeds back and is correctly received.After MS data a and the MS data b 0 and 1 expression data sequence number rather than bit.
Scene one: all data decodes are success all.
As shown in Figure 6, RS sends two classes feedback after correctly receiving the data that MS a and MS b send.
First kind feedback is MS data a0 to be received correct feedback send to MS a, and the correct feedback of MS data b 0 reception is sent to MS b; Equations of The Second Kind feedback is that MS data b 0 receives correct feedback and sends to MS a, and MS data a0 is received correct feedback sends to MS b, then utilizes data behind MS data a0 and MS data b 0 network code with same resource multicast transmission.
Merit attention, separately two feedbacks can utilize different time and frequency resource to send in the two classes feedbacks, also can utilize simultaneously different frequency to send.In addition, if whether physical characteristic (for example polarity) sign of the enough signals of energy receives correct, add whether feedack can identify reception correct, a signal can identify two feedbacks, and therefore two feedbacks can also utilize same frequency to send simultaneously.
MS a receives that the MS data b 0 of RS receives correct feedback, just can receive the network code data and utilize MS data a0 to carry out network decoding; MS b receives that the MS data a0 of RS receives correct feedback, just can receive the network code data and utilize MS data b 0 to carry out network decoding.
MS a is correctly decoded backward RS and sends the MS data b 0 correct concurrent new MS data a1 of feedback (because having received that RS receives MS data a0 and correctly feeds back) that receives; MSb is correctly decoded backward RS transmission MS data a0 and correctly receives feedback and send new MS data b 1 (receiving correctly feedback of MS data b 0 because received RS).
Scene two: RS fails correctly to receive the MS data b.
As shown in Figure 7, but RSRS correctly receives the data M S data a0 of MS a transmission fails correctly to receive the data M S data b 0 that MS b sends.RS will send two classes feedback.
First kind feedback is MS data a0 to be received correct feedback send to MS a, and MS data b 0 reception error feedback is sent to MS b; The Equations of The Second Kind feedback is MS data b 0 to be received error feedback send to MS a, and the correct feedback of MS data a0 reception is sent to MS b, then sends the information MS data a0 of correct reception with same resource multicast.
Merit attention, separately two feedbacks can utilize different time and frequency resource to send in the two classes feedbacks, also can utilize simultaneously different frequency to send.In addition, if whether physical characteristic (for example polarity) sign of the enough signals of energy receives correct, add whether feedack can identify reception correct, a signal can identify two feedbacks, and therefore two feedbacks can also utilize same frequency to send simultaneously.
MS a receives that MS data b 0 receives error feedback, can not receive multi-case data; MSb receives that MS data a0 receives correct feedback, just can receive multi-case data, and this moment, MS b can the Adoption Network decoding not receive multi-case data.
MS a does not receive multi-case data, does not send out feedback any, but receives correct feedback because receive MS data a0, will send new MS data a1; MS b is correctly decoded backward RS transmission MS data a0 and correctly receives feedback and retransmit MS data b 0 (receiving error feedback because received MS data b 0).
If RS correctly receives data M S data a1 and the MS data b 0 of MS a and MS b transmission, RS will send two classes feedback.
First kind feedback is MS data a1 to be received correct feedback send to MS a, and the correct feedback of MS data b 0 reception is sent to MS b; Equations of The Second Kind feedback is MS data b 0 to be received correct feedback send to MS a, and MS data a1 is received correct feedback sends to MS b, then utilizes data behind MS data a1 and MS data b 0 network code with same resource multicast transmission.
Scene three: MS a fails correctly to receive the network code data that RS sends.
As shown in Figure 8, RS correctly receives the rear two classes feedback that sends of data (MS data a0, MS data b 0) of MS a and MS b transmission.
First kind feedback is MS data a0 to be received correct feedback send to MS a, and the correct feedback of MS data b 0 reception is sent to MS b; Equations of The Second Kind feedback is that MS data b 0 receives correct feedback and sends to MS a, and MS data a0 is received correct feedback sends to MS b, then utilizes data behind MS data a0 and MS data b 0 network code with same resource multicast transmission.
Merit attention, separately two feedbacks can utilize different time and frequency resource to send in the two classes feedbacks, also can utilize simultaneously different frequency to send.In addition, if whether physical characteristic (for example polarity) sign of the enough signals of energy receives correct, add whether feedack can identify reception correct, a signal can identify two feedbacks, and therefore two feedbacks can also utilize same frequency to send simultaneously.
MS a receives that the MS data b 0 of RS receives correct feedback, just can receive the network code data and utilize MS data a0 to carry out network decoding; MS b receives that the MS data a0 of RS receives correct feedback, just can receive the network code data and utilize MS data b 0 to carry out network decoding.
MS a does not have correctly to receive the network code data that RS sends, and therefore sends MS data b 0 and receives wrong feedback, but receive correct feedback because receive MS data a0, and MSa will send new MS data a1 to RS; MS b is correctly decoded backward RS transmission MS data a0 and correctly receives feedback and send new MS data b 1 (receiving correct the feedback because received MS data b 0).
If RS correctly receives MS data a1 and the MS data b 1 of MS a and MS b transmission, RS is with buffer memory MS data a1 and MS data b 1 and send two classes feedback.The first kind is MS data a1 to be received correct feedback send to MS a, and the correct feedback of MS data b 1 reception is sent to MS b; Equations of The Second Kind is MS data b 0 to be received correct feedback send to node M S a, and MS data a1 reception error feedback is sent to node M S b.Then send the correct data M S data b 0 that receives with multicast.
MS b receives that MS data a1 receives error feedback, can not receive multi-case data; MSa receives that MS data b 0 receives correct feedback, just can receive multi-case data.
It should be noted that the data that this moment, relaying sent are MS data b 0 rather than new data that receive of retransmitting, new data can only be at the via node buffer memory.Therefore for the requirement of via node be certain buffer memory ability is arranged and receives the buffer memory number of times limited.When reaching thresholding, the buffer memory number of times all should send to block new data to the sending node negative feedback no matter oneself receive correctness.
As can be seen from the above description, the invention provides the data transmission method design of every jumping feedback under the complete network code.Other scenes all can be considered as the linear combination of above three kinds of scenes.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (6)
1. a data transmission method is characterized in that, comprising:
Whether relay node judges it correctly received from the data a of node A with from the data b of Node B;
If judged result is yes, then described via node correctly feeds back to indicate described via node correctly to receive respectively described data a and described data b to described node A and described Node B to described node A and the reception of described Node B transmission via node respectively, or described via node correctly feeds back to indicate described via node correctly to receive respectively described data b and described data a to described node A and described Node B to described node A and the reception of described Node B transmission via node respectively, respectively described data a and described data b are carried out network code, and the data a after will encoding and data receiver notice is sent to described Node B, and the data b behind the coding and described data receiver notice are sent to described node A;
Described node A receives correct feedback by described via node and knows that described via node has correctly received described data a, and described Node B receives correct feedback by described via node and knows that described via node has correctly received described data b,
After described node A receives described data receiver notice, data b behind the described coding is decoded, in the situation that successfully decoded, successfully decoded feedback and new data a1 are sent to described via node, in the situation that decode unsuccessfully, feedback and described new data a1 are sent to described via node with decoding unsuccessfully
After described Node B receives described data receiver notice, data a behind the described coding is decoded, in the situation that successfully decoded, described successfully decoded feedback and new data b 1 are sent to described via node, in the situation that decode unsuccessfully, described decoding unsuccessfully fed back with described new data b 1 be sent to described via node.
2. data transmission method according to claim 1 is characterized in that, in the situation that described node A decodes unsuccessfully, described Node B successfully decoded, also comprises:
Whether described relay node judges has correctly received described new data a1 and described new data b 1;
In the situation that judged result is yes, described via node
Send described via node reception to described node A and correctly feed back to indicate described via node correctly to receive described new data a1 to described node A, and send described data receiver notice and described data b to described node A,
Send described via node reception to described Node B and correctly feed back to indicate described via node correctly to receive described new data b 1 to described Node B, and notify to described Node B transmission data refusal.
3. data transmission method according to claim 1 is characterized in that, in the situation that described node A and described Node B successfully decoded all also comprises:
Whether described relay node judges has correctly received described new data a1 and described new data b 1;
In the situation that judged result is yes, described via node carries out network code to described new data a1 and described new data b 1 respectively,
Send described via node to described node A and receive correct feedback indicating described via node correctly to receive described new data a1 to described node A, and send data b 1 behind described data receiver notice and the coding to described node A,
Send described via node to described Node B and receive correct feedback indicating described via node correctly to receive described new data b 1 to described Node B, and send data a1 behind described data receiver notice and the coding to described Node B.
4. data transmission method according to claim 1 is characterized in that, in the situation that described node A and described Node B are all decoded is failed, also comprises:
Whether described relay node judges has correctly received described new data a1 and described new data b 1;
In the situation that judged result is yes, described via node carries out network code to described data a and described data b respectively,
Send described via node to described node A and receive correct feedback indicating described via node correctly to receive described new data a1 to described node A, and send data b behind described data receiver notice and the described coding to described node A,
Send described via node to described Node B and receive correct feedback indicating described via node correctly to receive described new data b 1 to described Node B, and send data a behind described data receiver notice and the described coding to described Node B.
5. data transmission method according to claim 1 is characterized in that, in the situation that correct described data a, the described data b of correct reception of receiving of described via node also comprises:
Described via node sends described via node to described node A and receives correct feedback and data refusal notice, and described data a and described data receiver notice is sent to described Node B, send via node to described Node B and receive error feedback to indicate described via node correctly not receive described data b to described Node B; And
Described node A sends new data a1 to described via node,
Described Node B receives described data a, and in the situation that receive successfully, sends and receives successfully feedback and described data b to described via node, in the situation that take defeat, sends and receives to described via node and unsuccessfully feeds back and described data b.
6. data transmission method according to claim 1 is characterized in that, in the situation that described via node also comprises described data a and all incorrect receptions of described data b:
Described via node notifies to indicate described via node correctly not receive described data a to described node A and need not receive data to described node A transmission via node reception error feedback and data refusal, and described via node is refused notice to indicate described via node correctly not receive described data b to described Node B and to need not receive data to described Node B transmission via node reception error feedback and described data;
Described node A receives error feedback by described via node to be known after described via node does not correctly receive described data a and again sends described data a to described via node, and described Node B receives error feedback by described via node and knows after described via node does not correctly receive described data b and again send described data b to described via node.
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| CN 200810088686 CN101562507B (en) | 2008-04-14 | 2008-04-14 | Data transmission method |
| PCT/CN2009/071235 WO2009127144A1 (en) | 2008-04-14 | 2009-04-10 | Data transmission method |
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| CN 200810088686 CN101562507B (en) | 2008-04-14 | 2008-04-14 | Data transmission method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101997647B (en) * | 2010-11-02 | 2013-03-06 | 北京邮电大学 | Network coding transmission method |
| CN102684818A (en) * | 2011-03-11 | 2012-09-19 | 华为技术有限公司 | Data retransmission method, relay station, base station and communication system |
| CN102972061B (en) * | 2011-06-27 | 2016-03-30 | 华为技术有限公司 | The cooperation transmission method of coding Network Based and system, base station and via node |
| CN102958071A (en) * | 2011-08-31 | 2013-03-06 | 普天信息技术研究院有限公司 | Method and device for realizing communication between base stations |
| CN102394733B (en) * | 2011-11-03 | 2014-11-12 | 北京邮电大学 | Double-base station single-relay multi-user data packet retransmission method based on network coding |
| CN102497248B (en) * | 2011-11-30 | 2015-05-27 | 电子科技大学 | Data retransmission method based on network coding |
| WO2014100988A1 (en) * | 2012-12-26 | 2014-07-03 | 华为技术有限公司 | Fountain code relay method and device |
| CN104219030B (en) * | 2013-05-31 | 2019-06-14 | 中兴通讯股份有限公司 | A kind of method and device of transmission network coded data |
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| US6788670B1 (en) * | 2000-10-27 | 2004-09-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Method for forwarding in multi-hop networks |
| KR20070074256A (en) * | 2006-01-09 | 2007-07-12 | 삼성전자주식회사 | Method for transmitting data through relay in a cellular network and thereof supporting cellular mobile communication system |
| CN101009512A (en) * | 2006-01-24 | 2007-08-01 | 华为技术有限公司 | Wireless transfer communication OFDM access system and method |
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| CN101562507A (en) | 2009-10-21 |
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