WO2016197558A1

WO2016197558A1 - Data transmission method and apparatus, and storage medium

Info

Publication number: WO2016197558A1
Application number: PCT/CN2015/096152
Authority: WO
Inventors: 王晓妮; 张芳
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-06-10
Filing date: 2015-12-01
Publication date: 2016-12-15
Also published as: CN106301680A

Abstract

Disclosed is a data transmission method. The method comprises: a relay node performing joint decoding processing on first information and second information to obtain first joint decoded information, and determining valid decoded information in the first joint decoded information; and performing network encoding on the valid decoded information to obtain network encoded information, and sending the network encoded information to a destination node, wherein the network encoded information serves as a basis for the destination node to perform joint decoding processing and judge whether it is necessary to retransmit information. Further disclosed are a data transmission apparatus, and a storage medium.

Description

Data transmission method, device and storage medium

Technical field

The present invention relates to the field of wireless network transmission technologies, and in particular, to a data transmission method, apparatus, and storage medium.

Background technique

Network Coding (NC) theory was originally proposed by Ahlswede et al. to increase network transmission capacity and improve throughput. It is a kind of information exchange technology that combines routing and coding. The idea is that each node in the network performs linear or non-linear processing on the information received on each channel and then forwards it to the destination node.

In the prior art, the relay node decodes the received information and performs network coding on the decoding result. However, the error propagation caused by the decoding error affects the decoding performance of the receiver, thereby increasing the number of retransmissions. Reduced spectrum utilization.

Therefore, providing a data transmission scheme, which can effectively avoid error propagation and improve spectrum utilization, has become an urgent problem to be solved.

Summary of the invention

In view of this, embodiments of the present invention are expected to provide a data transmission method, apparatus, and storage medium, which can effectively avoid error propagation, improve transmission reliability, and spectrum utilization.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

An embodiment of the present invention provides a data transmission method, where the method includes:

The relay node performs joint decoding processing on the first information and the second information to obtain first joint decoding information, and determines valid decoding information in the first joint decoding information;

Network coding the valid decoding information to obtain network coding information, and the network The coded information is sent to the destination node; the network coded information is used as a basis for the destination node to perform joint decoding processing and to determine whether information retransmission is required.

In the above solution, the determining the valid decoding information in the first joint decoding information includes:

The relay node performs a cyclic redundancy check CRC on the first joint decoding information, and determines that the information in the first joint decoding information that the CRC check succeeds is valid decoding information.

In the above solution, after the sending the network coding information to the destination node, the method further includes:

The relay node receives the non-acknowledgment NACK message fed back by the destination node, and determines that the information that needs to be retransmitted in the NACK message is correctly decoded and the number of retransmissions is not greater than a preset maximum number of retransmissions, and the retransmission is performed. Describe the information that needs to be retransmitted to the destination node;

Or, if it is determined that the information that needs to be retransmitted in the NACK message is decoded incorrectly and the number of retransmissions is not greater than a preset maximum number of retransmissions, the source node is notified to resend the information that needs to be retransmitted.

In the above solution, the information that needs to be retransmitted includes a data packet;

Correspondingly, the relay node resending the information that needs to be retransmitted to the destination node includes:

The relay node sends an incremental redundancy packet of the data packet to the destination node.

In the above solution, the information that needs to be retransmitted includes more than one data packet;

The relay node performs network coding on the information that needs to be retransmitted, and sends the encoded information to the destination node.

The embodiment of the invention further provides a data transmission method, the method comprising:

The destination node receives network coding information sent by the relay node, and decodes the network coding information to obtain pre-encoding information;

Performing joint decoding processing on the pre-encoding information and the third information to obtain second joint decoding information, and determining, according to the second joint decoding information, whether information retransmission is required;

The network coding information is that the relay node jointly decodes the first information and the second information to obtain the first joint decoding information, and after determining the effective decoding information in the first joint decoding information, Effectively decoding information to obtain information obtained by network coding.

In the foregoing solution, the determining, according to the second joint decoding information, whether information retransmission is required includes:

Performing a CRC check on the second joint decoding information. When the CRC check fails, it is determined that information retransmission needs to be performed. When the CRC check succeeds, it is determined that information retransmission is not required.

Correspondingly, when determining that information retransmission is required, the method further includes: feeding back NACK information to the relay node;

When it is determined that the information retransmission is not required, the method further includes: feedback confirming the ACK information to the relay node and the source node.

The embodiment of the present invention further provides a data transmission device, where the device is located at a relay node, and the device includes: a first processing module and a network coding module;

The first processing module is configured to perform joint decoding processing on the first information and the second information to obtain first joint decoding information, and determine valid decoding information in the first joint decoding information;

The network coding module is configured to perform network coding on the valid decoding information to obtain network coding information, and send the network coding information to a destination node; the network coding information is used as a destination node for joint decoding processing and Determine whether you need to retransmit the information.

In the above solution, the first processing module is configured to perform CRC check on the first joint decoding information, and determine that the information that the CRC check succeeds in the first joint decoding information is valid decoding information.

In the above solution, the device further includes: an information retransmission module, configured to receive the NACK message fed back by the destination node, and determine that the information that needs to be retransmitted in the NACK message is correctly decoded and the number of retransmissions is not greater than Resetting the information that needs to be retransmitted to the destination node when the maximum number of retransmissions is preset;

And, when it is determined that the information that needs to be retransmitted in the NACK message is decoded incorrectly and the number of retransmissions is not greater than a preset maximum number of retransmissions, the notification source node resends the information that needs to be retransmitted.

Correspondingly, the information retransmission module is configured to send an incremental redundancy packet of the data packet to the destination node.

Correspondingly, the information retransmission module is configured to perform network coding on the information that needs to be retransmitted, and send the encoded information to the destination node.

The embodiment of the present invention further provides a data transmission device, where the device is located at a destination node, and the device includes: a decoding module and a second processing module;

The decoding module is configured to receive network coding information sent by the relay node, and decode the network coding information to obtain pre-encoding information;

The second processing module is configured to perform joint decoding processing on the pre-encoding information and the third information to obtain second joint decoding information, and determine, according to the second joint decoding information, whether information retransmission is required;

In the above solution, the second processing module is configured to perform CRC check on the second joint decoding information. When the CRC check fails, it is determined that information retransmission needs to be performed. When the CRC check succeeds, it is determined that the CRC check is not performed. Information retransmission;

Correspondingly, the second processing module is further configured to feed back NACK information to the relay node when determining that information retransmission is required; and feedback ACK information to the relay node and the message when it is determined that information retransmission is not required. Source node.

The embodiment of the present invention further provides a computer storage medium storing a computer program configured to execute the above data transmission method of the embodiment of the present invention.

The data transmission method, device and storage medium provided by the embodiment of the present invention, the relay node performs joint decoding processing on the first information and the second information to obtain first joint decoding information, and determines the first joint decoding information. The effective decoding information is obtained by performing network coding on the valid decoding information to obtain network coding information, and transmitting the network coding information to a destination node; the network coding information is used as a destination node to decode the information The basis of the joint decoding process is the information and the third information. In this way, the joint decoding processing is performed on the first information and the second information, thereby improving the decoding performance of the relay node; only performing network coding on the effective decoding information, thereby avoiding error propagation caused by network coding; The HARQ (Hybrid Automatic Retransmission-request) technology is combined with network coding to improve the reliability of transmission and improve spectrum efficiency.

DRAWINGS

1 is a schematic flowchart of a data transmission method according to an embodiment of the present invention;

2 is a schematic flowchart of a data transmission method according to Embodiment 2 of the present invention;

3 is a schematic flowchart of a data transmission method according to Embodiment 3 of the present invention;

4 is a schematic diagram of a data transmission system according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a structure of a data transmission apparatus according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic structural diagram of a structure of a data transmission apparatus according to Embodiment 2 of the present invention.

detailed description

In the embodiment of the present invention, the relay node performs joint decoding processing on the first information and the second information to obtain first joint decoding information, and determines valid decoding information in the first joint decoding information; Decoding the effective decoding information to obtain network coding information, and the network is encoded The coded information is sent to the destination node; the network coded information is used as a basis for the destination node to perform joint decoding processing and to determine whether information retransmission is required;

The first information is information obtained by demodulating the source information sent by the source node by the relay node; the second information is correct for the source information obtained by the relay node listening to other relay nodes. Demodulated information.

Embodiment 1

FIG. 1 is a schematic flowchart of a data transmission method according to an embodiment of the present invention; as shown in FIG. 1 , a data transmission method according to an embodiment of the present invention includes:

Step 101: The relay node performs joint decoding processing on the first information and the second information to obtain first joint decoding information, and determines valid decoding information in the first joint decoding information.

Here, the first information is information obtained by demodulating the source information sent by the source node by the relay node;

The second information is that the relay node listens to the information obtained by the other relay nodes and correctly demodulates the source information;

Before the step, the method further includes: the relay node receives the source information sent by the source node, demodulates the source information, and listens to other relay nodes except the relay node to obtain other The information that the relay node correctly demodulates the source information;

The source information sent by the source node is: the source information sent by the source node in a broadcast manner, so that the relay node and the destination node receive the source information;

The other relay node is an activated relay node among other relay nodes;

The information that the other relay node correctly demodulates the source information is: any demodulation result information of all demodulation results after the other relay node correctly demodulates the source information, that is, if If the monitored relay node demodulates the source information correctly, there are three, and then one of the three correctly demodulated result information is taken;

Here, if the relay node is R _i , i=1, 2, . . . , M, M is a positive integer greater than 1; the source information is S _k , k=1, 2, . . . , N, then The log likelihood ratio information LLR _i,k obtained by demodulating the source information S _k by the relay node R _i , that is, the first information is:

Wherein, S ₀ is a set of bits in the modulation symbol of 0, a set of bits in the S ₁ modulation symbol is 1, a s is a modulation symbol in any one of the modulation symbol sets, and b is a bit of the modulation symbol, and the value is 0. Or 1, r is the information received by the receiving end when s is transmitted, δ ² is the noise variance; Pr (b=0|r) is the probability that the transmission is 0 when the receiving is r, and Pr(b=1|r) is When r is received, the probability of sending is 1.

That is, if the relay node being monitored is R _j , j=1, 2, ..., M, M is a positive integer greater than 1, then the monitored relay node correctly demodulates the source information S _k The obtained log likelihood ratio information, that is, the second information is LLR _j,k .

In an embodiment, the joint decoding process of the first information and the second information by the relay node includes:

The relay node performs iterative decoding processing on the first information and the second information by using a Belief Propagation (BP) algorithm; thus, the decoding performance of the relay node is improved.

Determining the effective decoding information in the first joint decoding information includes:

The relay node performs a Cyclic Redundancy Check (CRC) on the first joint decoding information, and determines that the information about the CRC check success in the first joint decoding information is valid decoding information; The effective decoding information is the information that participates in the network coding; correspondingly, the information that the CRC check failure in the first joint decoding information is determined to be invalid decoding information; the invalid decoding information is not participating in the network coding. Information; record the information in the CRC check for successful verification.

Step 102: Perform network coding on the valid decoding information to obtain network coding information, and send the network coding information to a destination node.

Here, performing network coding on the valid decoding information to obtain network coding information includes:

Updating the network coding coefficient of the network coding according to the valid decoding information, and performing network coding on the valid decoding information according to the updated network coding coefficient to obtain network coding information;

The network coding coefficients for performing network coding according to the valid decoding information are:

If the valid decoding information is: S _n =1, . . . , G, G ≤ N, and the invalid coding information is S _l = NG, . . . , N, the network coding coefficient of the updated network coding is: g _{i , x} = g _i,1 ,...,g _i,G ,0 _i,1 ,. . . 0 _{i, NG} ;

Correspondingly, the network coding information C _i obtained by performing network coding on the valid decoding information is:

That is,

In an embodiment, the network coding may be network coding in orthogonal multiple access mode or network coding in non-orthogonal multiple access.

In an embodiment, the network coding information is used as a basis for the destination node to perform joint decoding processing and to determine whether information retransmission is required;

Correspondingly, after the relay node sends the network coding information to the destination node, the method further includes:

The destination node receives network coding information sent by the relay node, and encodes the network information. Performing decoding to obtain pre-encoding information; performing joint decoding processing on the pre-encoding information and the third information to obtain second joint decoding information, and determining whether information retransmission is required according to the second joint decoding information;

The third information is information obtained by demodulating the source information sent by the source node by the destination node;

Determining, according to the second joint decoding information, whether information retransmission is required includes:

The destination node performs CRC check on the second joint decoding information. When the CRC check fails, it is determined that information retransmission needs to be performed and the non-acknowledged NACK information is fed back to the relay node, and the NACK information is also fed back to the source. Node; when the CRC check is correct, it is determined that no information retransmission is required and feedback ACK information is fed back to the relay node and the source node, so that the source node sends a new data packet in the next frame;

Correspondingly, the method further includes: the relay node receives the NACK message fed back by the destination node, and determines that the information that needs to be retransmitted in the NACK message is correctly decoded and the number of retransmissions is not greater than a preset maximum weight. Retransmitting the information that needs to be retransmitted to the destination node when the number of times is transmitted; the preset maximum number of retransmissions may be set according to actual needs;

Or, if it is determined that the information that needs to be retransmitted in the NACK message is incorrectly decoded and the number of retransmissions is not greater than a preset maximum number of retransmissions, the source node is notified to resend the information that needs to be retransmitted;

Here, the information that needs to be retransmitted in the NACK message is: information that the CRC check fails in the second joint decoding information, that is, the source information of the destination node decoding error;

Determining that the information included in the NACK message that needs to be retransmitted is correctly decoded includes:

The relay node determines, according to the CRC check record, that the information that needs to be retransmitted is the information that the CRC check is correct, that is, the relay node decodes the information that needs to be retransmitted correctly;

When the information that needs to be retransmitted includes a data packet, the relay node resends the need The information to be retransmitted to the destination node includes: the relay node sends an incremental redundancy packet of the data packet to the destination node until all data transmission is completed;

When the information that needs to be retransmitted includes more than one data packet, the relay node resending the information that needs to be retransmitted to the destination node includes:

The relay node performs network coding on the information that needs to be retransmitted, and sends the encoded information to the destination node until all data transmission is completed;

The relay node resends the information that needs to be retransmitted to the destination node and feeds back the ACK message to the source node to inform the source node that the decoding is correct, so that the source node sends a new data packet in the next frame;

The information that the notification source node resends the information that needs to be retransmitted includes:

The relay node feeds back a NACK message to the source node; the information included in the NACK message needs to be retransmitted;

When the relay node determines that the information that needs to be retransmitted in the NACK message is correctly decoded and the number of retransmissions is greater than the preset maximum number of retransmissions, the data packet corresponding to the information that needs to be retransmitted is discarded, and the notification is notified. The source node sends a new data packet in the next frame;

When the relay node determines that it decodes the information that needs to be retransmitted in the NACK message and the number of retransmissions is greater than the preset maximum number of retransmissions, the notification source node discards the data corresponding to the information that needs to be retransmitted. Packet, sending a new packet in the next frame.

In an embodiment, when the source node receives the ACK message fed back by the destination node, the new data packet is sent in the next frame regardless of what information the relay node feeds back.

Embodiment 2

2 is a schematic flowchart of a data transmission method according to an embodiment of the present invention; as shown in FIG. 2, a data transmission method according to an embodiment of the present invention includes:

Step 201: The destination node receives network coding information sent by the relay node, and decodes the network coding information to obtain pre-encoding information.

Here, the network coding information is that the relay node jointly decodes the first information and the second information to obtain the first joint decoding information, and after determining the effective decoding information in the first joint decoding information, Effectively decoding information to obtain information obtained by network coding;

Correspondingly, before the step, the method further includes: the relay node performs joint decoding processing on the first information and the second information to obtain first joint decoding information, and determines that the first joint decoding information is valid. Decoding information, performing network coding on the valid decoding information to obtain network coding information, and transmitting the network coding information to a destination node;

The first information is information obtained by the relay node demodulating the source information sent by the source node;

The other relay node is an activated relay node among other relay nodes;

The joint decoding process of the first information and the second information by the relay node includes:

The relay node performs an iterative decoding process on the first information and the second information by using a BP algorithm; thus, the decoding performance of the relay node is improved;

The relay node performs a CRC check on the first joint decoding information, and determines that the information that the CRC check succeeds in the first joint decoding information is valid decoding information; the valid decoding information is the participating network coding. Correspondingly, determining that the CRC check failure information in the first joint decoding information is invalid decoding information; the invalid decoding information is information not participating in network coding; and recording CRC check verification Successful information;

Performing network coding on the valid decoding information to obtain network coding information includes:

That is,

Step 202: Perform joint decoding processing on the pre-encoding information and the third information to obtain second joint decoding information, and determine, according to the second joint decoding information, whether information retransmission needs to be performed.

Here, the third information is information obtained by demodulating the source information sent by the source node by the destination node;

The destination node performs CRC check on the second joint decoding information, and when the CRC check fails, Determining that information retransmission is required and feedback non-acknowledgment NACK information is fed back to the relay node, and the NACK information is also fed back to the source node; when the CRC check is correct, it is determined that information retransmission is not required and feedback acknowledgement ACK information is sent to Following the node and the source node, so that the source node sends a new data packet in the next frame;

When the information that needs to be retransmitted includes a data packet, the relay node resending the information that needs to be retransmitted to the destination node, and the relay node sends the incremental redundancy packet of the data packet to the destination node. Until all data is sent;

The relay node resends the information that needs to be retransmitted to the destination node and simultaneously feeds back the ACK. The information is sent to the source node to inform the source node that the decoding is correct, so that the source node sends a new data packet in the next frame;

Embodiment 3

3 is a schematic flowchart of a data transmission method according to an embodiment of the present invention; FIG. 4 is a schematic diagram of a data transmission system according to an embodiment of the present invention, where S is a source node, R is a relay node, and D is a destination node; As shown in FIG. 4, the data transmission method of the embodiment of the present invention includes:

Step 301: The source node sends the source information, so that the relay node and the destination node receive the source information.

Here, the source node, the relay node, and the destination node may each be one or more;

This step includes: the source node sends the source information in a broadcast form.

Step 302: The current relay node demodulates the received source information and listens to other activated relay nodes.

Here, if the relay node is R _i , i=1, 2, . . . , M, M is a positive integer greater than 1; and the source information is S _k , k=1, 2, . . . , N, then The log likelihood ratio information LLR _i,k obtained by demodulating the source information S _k by the relay node R _i is:

Step 303: The current relay node performs joint decoding processing on the first information and the second information to obtain first joint decoding information, and determines valid decoding information in the first joint decoding information.

In an embodiment, the joint decoding process performed by the current relay node on the first information and the second information includes:

The current relay node performs an iterative decoding process on the first information and the second information by using a BP algorithm; thus, the decoding performance of the relay node is improved.

The current relay node performs a CRC check on the first joint decoding information, and determines that the information that the CRC check succeeds in the first joint decoding information is valid decoding information; the valid decoding information is a participating network. Corresponding information, determining that the information of the CRC check failure in the first joint decoding information is invalid decoding information; the invalid decoding information is information not participating in network coding; recording a CRC check Successful information.

Step 304: Perform network coding on the valid decoding information to obtain network coding information, and send the network coding information to the destination node.

That is,

The network coding may be network coding in orthogonal multiple access mode or network coding under non-orthogonal multiple access.

Step 305: The destination node receives the network coding information sent by the relay node, and decodes the network coding information to obtain pre-encoding information.

Step 306: Perform joint decoding processing on the pre-encoding information and the third information to obtain second joint decoding information, and determine, according to the second joint decoding information, whether information retransmission is required. If the retransmission is required, step 307 is performed; if retransmission is not required, step 313 is performed;

Performing joint decoding processing on the pre-encoding information and the third information to obtain second joint decoding information, including:

Performing an iterative decoding process on the pre-encoding information and the third information by using a BP algorithm to obtain second joint decoding information;

The destination node performs CRC check on the second joint decoding information. When the CRC check fails, it is determined that information retransmission needs to be performed. When the CRC check is correct, it is determined that information retransmission is not required.

Step 307: The destination node feeds back a NACK message to the current relay node and the source node.

Here, the NACK message includes information that needs to be retransmitted, that is, the destination node decodes the wrong source information.

Step 308: The current relay node determines whether it is correct to decode the information that needs to be retransmitted in the NACK message. If the decoding is correct, go to step 309; otherwise, go to step 314;

The step includes: the current relay node determines, according to the CRC check record, that the information that needs to be retransmitted is the information that the CRC check is correct, that is, the relay node decodes the information that needs to be retransmitted correctly.

Step 309: The current relay node determines whether the number of information retransmission times is greater than a preset maximum number of retransmissions. If not, step 310 is performed; otherwise, step 316 is performed;

Here, the preset maximum number of retransmissions can be set according to actual needs.

Step 310: The current relay node determines whether the data packet corresponding to the information that needs to be retransmitted is only one. If it is greater than one, step 311 is performed; if it is only one data packet, step 312 is performed.

Step 311: The current relay node performs network coding on the information that needs to be retransmitted, and then The network coding information obtained after the coding is sent to the destination node, and step 305 is performed.

Step 312: The current relay node sends an incremental redundancy packet of the data packet corresponding to the information that needs to be retransmitted to the destination node, and step 305 is performed.

Step 313: The destination node sends the ACK information to the relay node and the source node, so that the source node sends the new source information, that is, step 301 is performed.

Step 314: The current relay node determines whether the number of information retransmission times is greater than a preset maximum number of retransmissions. If not, step 315 is performed; otherwise, step 316 is performed;

Step 315: The source node is notified to resend the information that needs to be retransmitted.

The step includes: the current relay node sends a NACK message to the source node; and the NACK message includes information that needs to be retransmitted.

Step 316: The source node is notified to send new source information, and then step 301 is performed.

Embodiment 4

5 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention; the device is located at a relay node, as shown in FIG. 5, the data transmission device of the embodiment of the present invention comprises: a first processing module 51 and a network coding module 52; ,

The first processing module 51 is configured to perform joint decoding processing on the first information and the second information to obtain first joint decoding information, and determine valid decoding information in the first joint decoding information;

The network coding module 52 is configured to perform network coding on the valid decoding information to obtain network coding information, and send the network coding information to a destination node;

The network coding information is used as a basis for the destination node to perform joint decoding processing and to determine whether information retransmission is required;

The first information is information obtained by demodulating the source information sent by the source node by the relay node;

The second information is that the relay node listens to other relay nodes and obtains positive information about the source information. Confirm the demodulated information.

In an embodiment, the first processing module 51 is further configured to receive source information sent by the source node, demodulate the source information, and listen to other relays than the relay node. The node obtains information that the other relay node correctly demodulates the source information;

The other relay node is an activated relay node among other relay nodes;

Here, if the relay node is R _i , i=1, 2, . . . , M, M is a positive integer greater than 1; and the source information is S _k , k=1, 2, . . . , N, then The log likelihood ratio information LLR _i,k obtained by demodulating the source information S _k by the relay node R _i , that is, the first information is:

In an embodiment, the first processing module 51 is configured to use a BP algorithm to the first letter. The information and the second information are subjected to iterative decoding processing; thus, the decoding performance of the relay node is improved.

In an embodiment, the first processing module 51 is configured to perform CRC check on the first joint decoding information, and determine that the CRC check success information in the first joint decoding information is valid decoding. Information; the valid decoding information is information participating in the network coding; correspondingly, determining that the information of the CRC check failure in the first joint decoding information is invalid decoding information; the invalid decoding information is Information that participates in network coding; records information that the verification is successful in the CRC check.

The network coding module 52 is configured to update the network coding coefficient of the network coding according to the valid decoding information, and perform network coding on the valid decoding information according to the updated network coding coefficient to obtain network coding information;

The network coding module 52 updates network coding coefficients for performing network coding according to the valid coding information, including:

If the valid decoding information is: S _n =1, . . . , G, G ≤ N, and the invalid coding information is S _l =NG, . . . , N, the network coding module 52 updates the network coding network. The coding coefficients are: g _{i, x} = g _i,1 ,...,g _i,G ,0 _i,1 ,. . . 0 _{i, NG} ;

Correspondingly, the network coding information C _i obtained by the network coding module 52 performing network coding on the valid decoding information is:

That is,

In an embodiment, the device further includes: an information retransmission module 53 configured to receive the non-acknowledgment NACK message fed back by the destination node, and determine that the information that needs to be retransmitted in the NACK message is correctly decoded and When the number of retransmissions is not greater than the preset maximum number of retransmissions, the information that needs to be retransmitted is resent to the destination node;

And, if it is determined that the information that needs to be retransmitted in the NACK message is decoded incorrectly, and the number of retransmissions is not greater than a preset maximum number of retransmissions, the notification source node resends the information that needs to be retransmitted;

The information retransmission module 53 determines that the decoding of the information that needs to be retransmitted in the NACK message is correct.

The information retransmission module 53 determines, according to the CRC check record, that the information that needs to be retransmitted is the information that the CRC check is correct, that is, the relay node decodes the information that needs to be retransmitted correctly.

In an embodiment, the information that needs to be retransmitted includes a data packet;

Correspondingly, the information retransmission module 53 is configured to send an incremental redundancy packet of the data packet to the destination node.

In an embodiment, the information that needs to be retransmitted includes more than one data packet;

Correspondingly, the information retransmission module 53 is configured to perform network coding on the information that needs to be retransmitted, and send the encoded information to the destination node.

In an embodiment, the information retransmission module 53 determines that the information that needs to be retransmitted in the NACK message is correctly decoded and the number of retransmissions is not greater than a preset maximum number of retransmissions. The information retransmission module 53 is further configured to feed back an ACK message to the source node to inform the source node that the decoding is correct, so that the source node sends a new data packet in the next frame.

In an embodiment, the information retransmission module 53 is further configured to determine that the information that needs to be retransmitted in the NACK message is correctly decoded and the number of retransmissions is greater than a preset maximum number of retransmissions, and is discarded. And the data packet corresponding to the information that needs to be retransmitted, and notifying the source node to send a new data packet in the next frame;

And, when it is determined that the information that needs to be retransmitted in the NACK message is decoded incorrectly, and the number of retransmissions is greater than a preset maximum number of retransmissions, the source node is notified to discard the data packet corresponding to the information that needs to be retransmitted. , send a new packet in the next frame.

Embodiment 5

FIG. 6 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention; the device is located at a destination node, and the data transmission device of the embodiment of the present invention comprises: a decoding module 61 and a second processing module 62;

The decoding module 61 is configured to receive network coding information sent by the relay node, and decode the network coding information to obtain pre-encoding information;

The second processing module 62 is configured to perform joint decoding processing on the pre-encoding information and the third information to obtain second joint decoding information, and determine, according to the second joint decoding information, whether information retransmission is needed. ;

The network coding information is that the relay node jointly decodes the first information and the second information to obtain the first joint decoding information, and after determining the effective decoding information in the first joint decoding information, Effectively decoding information to obtain information obtained by network coding;

Correspondingly, the second processing module 62 is further configured to receive source information sent by the source node.

In an embodiment, the second processing module 62 is configured to perform an iterative decoding process on the pre-encoding information and the third information by using a BP algorithm to obtain second joint decoding information.

In an embodiment, the second processing module 62 is configured to perform CRC check on the second joint decoding information. When the CRC check fails, it is determined that information retransmission needs to be performed. When the CRC check succeeds, the CRC is determined. No need to retransmit the information;

Correspondingly, the second processing module 62 is further configured to: when determining that retransmission of information is required, to feed back NACK information to the relay node; and when determining that retransmission of information is not required, feeding back ACK information to the relay node and Source node

The NACK message includes information that needs to be retransmitted, that is, the second processing module 62 decodes the wrong source information.

The first processing module 51, the network encoding module 52, the information retransmission module 53, the decoding module 61, and the second processing module 62, which are proposed in the embodiments of the present invention, may all be implemented by a processor, and may also pass through a specific logic circuit. The processor may be a mobile terminal or a processor on a server. In practical applications, the processor may be a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP), or a field. Programmable Gate Array (FPGA), etc.

In the embodiment of the present invention, if the above data transmission method is implemented in the form of a software function module and sold or used as a stand-alone product, it may also be stored in a computer readable storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions. A computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, and a read only memory (Read Various media such as Only Memory, ROM, disk or CD-ROM that can store program code. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

Correspondingly, the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a computer program, and the computer program is used to execute the data transmission method of the embodiment of the present invention.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

In the embodiment of the present invention, the relay node performs joint decoding processing on the first information and the second information to obtain first joint decoding information, and determines valid decoding information in the first joint decoding information; The code information is network coded to obtain network coding information, and the network coding information is sent to the destination node; the network coding information is used as a basis for the destination node to perform joint decoding processing and determine whether information retransmission is needed. In this way, the joint decoding processing is performed on the first information and the second information, thereby improving the decoding performance of the relay node; only performing network coding on the effective decoding information, thereby avoiding error propagation caused by network coding; and simultaneously, the HARQ technology is adopted. Combined with network coding, it improves the reliability of transmission and improves spectrum efficiency.

Claims

A data transmission method, the method comprising:

The relay node performs joint decoding processing on the first information and the second information to obtain first joint decoding information, and determines valid decoding information in the first joint decoding information;

Performing network coding on the valid decoding information to obtain network coding information, and transmitting the network coding information to a destination node; the network coding information is used as a destination node for joint decoding processing and determining whether information retransmission is required in accordance with.
The method of claim 1, wherein the determining the valid coding information in the first joint coding information comprises:

The relay node performs a cyclic redundancy check CRC on the first joint decoding information, and determines that the information in the first joint decoding information that the CRC check succeeds is valid decoding information.
The method according to claim 1 or 2, wherein after the sending the network coding information to the destination node, the method further comprises:

The relay node receives the non-acknowledgment NACK message fed back by the destination node, and determines that the information that needs to be retransmitted in the NACK message is correctly decoded and the number of retransmissions is not greater than a preset maximum number of retransmissions, and the retransmission is performed. Describe the information that needs to be retransmitted to the destination node;

Or, if it is determined that the information that needs to be retransmitted in the NACK message is decoded incorrectly and the number of retransmissions is not greater than a preset maximum number of retransmissions, the source node is notified to resend the information that needs to be retransmitted.
The method of claim 3 wherein said information requiring retransmission comprises a data packet;

Correspondingly, the relay node resending the information that needs to be retransmitted to the destination node includes:

The relay node sends an incremental redundancy packet of the data packet to the destination node.
The method of claim 3 wherein said information requiring retransmission comprises more than one data packet;

Correspondingly, the relay node resending the information that needs to be retransmitted to the destination node includes:

The relay node performs network coding on the information that needs to be retransmitted, and sends the encoded information to the destination node.
A data transmission method, the method comprising:

The destination node receives network coding information sent by the relay node, and decodes the network coding information to obtain pre-encoding information;

Performing joint decoding processing on the pre-encoding information and the third information to obtain second joint decoding information, and determining, according to the second joint decoding information, whether information retransmission is required;

The network coding information is that the relay node jointly decodes the first information and the second information to obtain the first joint decoding information, and after determining the effective decoding information in the first joint decoding information, Effectively decoding information to obtain information obtained by network coding.
The method according to claim 6, wherein said determining, according to said second joint decoding information, whether information retransmission is required comprises:

Performing a CRC check on the second joint decoding information. When the CRC check fails, it is determined that information retransmission needs to be performed. When the CRC check succeeds, it is determined that information retransmission is not required.

Correspondingly, when determining that information retransmission is required, the method further includes: feeding back NACK information to the relay node;

When it is determined that information retransmission is not required, the method further includes: feeding back confirmation ACK information to the relay node.
A data transmission device, the device is located at a relay node, and the device includes: a first processing module and a network coding module; wherein

The first processing module is configured to perform joint decoding processing on the first information and the second information to obtain first joint decoding information, and determine valid decoding information in the first joint decoding information;

The network coding module is configured to perform network coding on the valid decoding information to obtain network coding information, and send the network coding information to a destination node; the network coding information It is used as a basis for the joint node to perform joint decoding processing and to determine whether information retransmission is required.
The apparatus according to claim 8, wherein the first processing module is configured to perform CRC check on the first joint decoding information, and determine that the CRC verification success information in the first joint decoding information is Effectively decode information.
The device according to claim 8 or 9, wherein the device further comprises: an information retransmission module configured to receive a NACK message fed back by the destination node, and determine that the information contained in the NACK message that needs to be retransmitted is translated. When the code is correct and the number of retransmissions is not greater than the preset maximum number of retransmissions, the information that needs to be retransmitted is resent to the destination node;

And, when it is determined that the information that needs to be retransmitted in the NACK message is decoded incorrectly and the number of retransmissions is not greater than a preset maximum number of retransmissions, the notification source node resends the information that needs to be retransmitted.
The apparatus according to claim 10, wherein said information to be retransmitted comprises a data packet;

Correspondingly, the information retransmission module is configured to send an incremental redundancy packet of the data packet to the destination node.
The apparatus of claim 10 wherein said information requiring retransmission comprises more than one data packet;

Correspondingly, the information retransmission module is configured to perform network coding on the information that needs to be retransmitted, and send the encoded information to the destination node.
A data transmission device, the device is located at a destination node, and the device includes: a decoding module and a second processing module;

The decoding module is configured to receive network coding information sent by the relay node, and decode the network coding information to obtain pre-encoding information;

The second processing module is configured to perform joint decoding processing on the pre-encoding information and the third information to obtain second joint decoding information, and determine, according to the second joint decoding information, whether To retransmit the information;

The network coding information is that the relay node jointly decodes the first information and the second information to obtain the first joint decoding information, and after determining the effective decoding information in the first joint decoding information, Effectively decoding information to obtain information obtained by network coding.
The apparatus according to claim 13, wherein the second processing module is configured to perform CRC check on the second joint decoding information, and when the CRC check fails, it is determined that information retransmission needs to be performed, and the CRC check succeeds. When it is determined that no information retransmission is required;

Correspondingly, the second processing module is further configured to: feed back NACK information to the relay node when determining that information retransmission is required; and feed back ACK information to the relay node when it is determined that information retransmission is not required.
A computer storage medium having stored therein computer executable instructions for performing the data transmission method of any one of claims 1 to 5.
A computer storage medium having stored therein computer executable instructions for performing the data transmission method of any one of claims 6 to 7.