CN101807982A - HARQ method for one-way / two-way relay - Google Patents

Abstract

A HARQ method for one-way/two-way relay, wherein the HARQ method for one-way relay includes: sending data to the relay station by Node B in time slot 1 according to a predetermined redundancy version RV, and at the same time, the user end The transmitted data is sensed from the node B; and the relay station forwards the data to the user terminal according to another redundancy version different from the predetermined redundancy version in time slot 2, so that the user terminal based on the received data and the detection heard data to recover the data sent by Node B.

Description

HARQ method for one-way/two-way relay

technical field

The present invention relates to a hybrid automatic repeat request (HARQ) method applied to one-way/two-way relay. More specifically, the present invention relates to an improved HARQ method and system for one-way/two-way relay, wherein the relay station forwards data with a different redundancy version (RV) than the received data, thereby further improving transmission reliability .

Background technique

Hybrid Automatic Repeat Request (HARQ) is a mechanism for improving transmission reliability in wireless communications. FIG. 1 shows a HARQ method of N-channel "Stop-And-Wait" mode in a traditional cellular communication system. In the HARQ method shown in Figure 1, Node B (NB) first sends data P1, P2, and P3 (i.e., (P1 RV0), (P2 RV0) and (P3 RV0)) according to redundancy version (redundancy version) RV0 to the user end (UE). If the user end receives correct sending data, the user end sends an ACK signal back to Node B, and if the user end does not receive correct sending data, the user end sends a NAK signal back to Node B. For example, if Node B receives an ACK signal for data P1 and P3, Node B will continue to send new data P4 and P5 according to redundancy version RV0 (ie, (P4 RV0) and (P5 RV0)). If the node B receives a NAK signal for the data P2, the node B will resend the data P2 according to the new redundancy version RV1 (ie, (P2 RV1)). By analogy, all data transfers are completed.

One-way/two-way relays are both techniques used to improve coverage and user throughput. FIG. 2 and FIG. 3 respectively show block diagrams of a one-way relay system and a two-way relay system applying HARQ in the prior art.

In the block diagram of the one-way relay system using HARQ shown in FIG. 2, in time slot 1, the node B 10 sends the data P1 processed according to RV0 (that is, (P1 RV0)) to the relay station 20, and at the same time, the user end 30 Snooped data (P1 RV0) from Node B 10. Then, in time slot 2, the relay station 20 forwards the data (P1 RV0) processed according to RV0 to the user terminal 30, so that the user terminal 30 resumes the transmitted data P1. Furthermore, data transmission from the UE 30 to the Node B 10 can be performed in a similar HARQ manner.

In the block diagram of the two-way relay system using HARQ shown in FIG. 3, in time slot 1, the node B 40 sends the data P1 (that is, (P1 RV0)) processed according to RV0 to the relay station 50, and at the same time, the user end 60 Data (P1 RV0) is heard from Node B 40. In time slot 2, the UE 60 sends the data P2 processed according to RV0 (ie, (P2 RV0)) to the relay station 50, and at the same time, the Node B 40 intercepts the data (P2 RV0) from the UE 60. Then, in time slot 3, the relay station 50 XORs the received data according to RV0, and sends the XOR result ((P1 RV0)xor(P2RV0)) to the node B 40 and the user terminal 60 respectively, so that the node B 40 and client 60 restore their respective data.

From the above description, it can be seen that in the traditional technical scheme of applying HARQ to one-way/two-way relay, because the same redundancy version is used, HARQ only provides time-graded gain, and does not involve any network coding Therefore, it is necessary to propose a HARQ method and system for one-way/two-way relay that can further enhance transmission reliability.

Contents of the invention

The object of the present invention is to provide a HARQ method and system for one-way/two-way relay, wherein the relay station uses different redundancy versions to process the data to be forwarded, thereby introducing cooperative coding gain and further improving data transmission reliability.

According to one aspect of the present invention, there is provided a HARQ method for one-way relay, the method includes: sending data to the relay station by Node B in time slot 1 according to a predetermined redundancy version RV, and at the same time, the user end slave node B detects the sent data; and the relay station forwards the data to the user terminal in time slot 2 according to another redundancy version different from the predetermined redundancy version, so that the user terminal detects the data based on the received data and the detected redundancy version. data to restore the data sent by Node B.

The user end sends data to the relay station in time slot 3 according to a predetermined redundancy version, and at the same time, Node B detects the sent data from the user end; and the relay station sends data to the relay station in time slot 4 according to another A redundant version forwards the data to the Node B, so that the Node B restores the data sent by the client based on the received data and the intercepted data.

The predetermined redundancy version is RV0, and the other redundancy version is RV1.

The predetermined redundancy version is RV1, and the other redundancy version is RV0.

The predetermined redundancy version is any one of RV0, RV2, RV4...RV(2n), and the other redundancy version is the corresponding redundant version in RV1, RV3, RV5...RV(2n-1). Yu version, wherein, n is an integer greater than or equal to 0.

In the type III HARQ mode, the predetermined redundancy version is any one of RV1, RV3, RV5...RV(2n-1), and the other redundancy version is RV0, RV2, RV4... The corresponding redundancy version in RV(2n), where n is an integer greater than or equal to 0.

According to another aspect of the present invention, there is provided a HARQ method for two-way relay, the method includes: sending data to the relay station by the Node B in time slot 1 according to the predetermined redundancy version RV, and at the same time, the user end from The node B detects the sent data; the user end sends the data to the relay station in time slot 2 according to the predetermined redundancy version, and at the same time, the node B detects the sent data from the user end; Send the XOR result of the data to the node B and the user end respectively based on another redundancy version of the predetermined redundancy version, so that the node B and the user end restore their respective data.

According to another aspect of the present invention, there is provided a one-way relay system applying HARQ, which includes: a node B, a relay station, and a user end, wherein the relay station forwards data from the node B to the user end, and the middle The relay system is characterized in that: Node B sends data to the relay station in time slot 1 according to a predetermined redundancy version RV, and at the same time, the user terminal detects the transmitted data from Node B; The other redundant version of the redundant version forwards the data to the UE, so that the UE restores the data sent by the Node B based on the received data and the intercepted data.

According to another aspect of the present invention, there is provided a two-way relay system using HARQ, which includes: a Node B, a relay station, and a user terminal, wherein the relay station sends the XOR results of the data from the Node B and the user terminal to the The node B and the user end, the relay system is characterized in that: the node B sends data to the relay station in time slot 1 according to the predetermined redundancy version RV, and at the same time, the user end detects the sent data from the node B; Time slot 2 sends data to the relay station according to a predetermined redundancy version, and at the same time, Node B senses the sent data from the user end; and the relay station sends data to the relay station according to another redundancy version different from the predetermined redundancy version in time slot 3 The XOR result of the data is sent to the node B and the user end respectively, so that the node B and the user end recover their respective data based on the received data and the intercepted data.

Description of drawings

The above-mentioned and/or other objects and advantages of the present invention will become more clear through the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 shows the HARQ method of N channel "stop waiting (Stop-And-Wait)" mode in the traditional cellular communication system;

FIG. 2 shows a block diagram of a unidirectional relay system applying HARQ in the prior art;

FIG. 3 shows a block diagram of a two-way relay system applying HARQ in the prior art;

FIG. 4 shows a block diagram of a one-way relay system applying HARQ according to an exemplary embodiment of the present invention;

FIG. 5 shows a flowchart of a HARQ method for unidirectional relay according to an exemplary embodiment of the present invention;

FIG. 6 shows a block diagram of a two-way relay system applying HARQ according to an exemplary embodiment of the present invention; and

Fig. 7 shows a flowchart of a HARQ method for two-way relay according to an exemplary embodiment of the present invention.

Detailed ways

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

FIG. 4 shows a block diagram of a one-way relay system using HARQ according to an exemplary embodiment of the present invention, wherein the Node B 100 shown in FIG. 1. The relay station 20 is similar to the user terminal 30, except that the relay station 200 uses a different RV from the received data to process the data and then forward it.

A method for applying HARQ to one-way relay according to an exemplary embodiment of the present invention will be described below with reference to FIG. 4 and FIG. 5 .

Fig. 5 shows a flowchart of a HARQ method for unidirectional relay according to an exemplary embodiment of the present invention. Referring to Fig. 5, in step S100, node B 100 will be in time slot 1 according to specific redundancy version, for example, data P1 processed by RV0 (that is, (P1 RV0)) is sent to relay station 200, meanwhile, user end 300 from node B 100 snooped data (P1 RV0). Then, in step S200, the relay station 200 forwards the data (P1 RV1) processed according to another redundancy version different from the received data, for example, RV1 to the user terminal 300 in time slot 2, so that the user terminal 300 based on the interception Received data (P1 RV0) and received data (P1 RV1) to restore data P1. As another example, the Node B 100 may adopt RV1 in step S100, while the relay station 200 adopts RV0 in step S200. The foregoing redundancy versions RV0 and RV1 are merely examples and do not limit the present invention in any sense, and any different redundancy versions can be applied to the present invention. For example, Node B 100 may transmit data using any one of redundancy versions RV0, RV2, RV4...RV(2n) in step S100, in which case relay station 200 uses RV1, RV3 in step S200 , RV5...RV(2n-1) corresponding redundancy versions to forward data, where n is an integer greater than or equal to 0. As a preferred manner, in the above example, different redundancy versions can be selected especially for the HARQ mode of Type III. At this time, Node B 100 can adopt redundancy versions RV1, RV3, RV5...RV(2n in step S100 Any one of -1) to transmit data, and the relay station 200 uses the corresponding redundancy version among RV0, RV2, RV4...RV(2n) to forward the data in step S200. Furthermore, as an example, data transmission from the UE 300 to the Node B 100 can be performed in a similar HARQ manner. Specifically, in step S300, the UE 300 sends data P2 processed according to a specific redundancy version, for example, RV0 (that is, (P2 RV0)) to the relay station 200 in time slot 3. 300 snooped data (P2 RV0). Then, in step S400, the relay station 200 forwards the data (P2 RV1) processed according to another redundancy version different from the received data, for example, RV1, to the Node B 100 in time slot 4, so that the Node B 100 based on the interception Data received (P2 RV0) and data received (P2 RV1) to recover data P2. As another example, the UE 300 may adopt RV1 in step S300, and the relay station 200 may adopt RV0 in step S400. The foregoing redundancy versions RV0 and RV1 are merely examples and do not limit the present invention in any sense, and any different redundancy versions can be applied to the present invention. For example, the client 300 may use any one of redundancy versions RV0, RV2, RV4...RV(2n) in step S300 to send data, in this case, the relay station 200 uses RV1, RV3 in step S400 , RV5...RV(2n-1) corresponding redundancy versions to forward data, where n is an integer greater than or equal to 0. As a preferred manner, in the above example, different redundancy versions can be selected especially for the HARQ mode of type III. At this time, the user end 300 can adopt redundancy versions RV1, RV3, RV5...RV(2n in step S300 Any one of -1) to transmit data, and the relay station 200 uses the corresponding redundancy version among RV0, RV2, RV4...RV(2n) to forward the data in step S400.

6 shows a block diagram of a two-way relay system using HARQ according to an exemplary embodiment of the present invention, wherein the Node B 400, the relay station 500, and the user terminal 600 shown in FIG. The relay station 50 is similar to the client terminal 60, except that the relay station 500 uses a different RV from the received data to process the data and forward it.

A method for applying HARQ to two-way relay according to an exemplary embodiment of the present invention will be described below with reference to FIG. 6 and FIG. 7 .

Fig. 7 shows a flowchart of a HARQ method for two-way relay according to an exemplary embodiment of the present invention. With reference to Fig. 7, in step S10, node B 400 will be in time slot 1 according to specific redundancy version, for example, the data P1 (that is, (P1 RV1)) of RV1 process is sent to relay station 500, and simultaneously, user end 600 from node B 400 Listen to data (P1 RV1). In step S20, the UE 600 sends the data P2 processed according to RV1 (ie (P2 RV1)) to the relay station 500 in time slot 2, and the Node B 400 detects the data (P2 RV1) from the UE 600 at the same time. Then, in step S30, the relay station 500 performs XOR on the received data in time slot 3 according to another redundancy version different from the received data, for example, RV0, and XORs the XOR result ((P1 RV0)xor (P2RV0)) are sent to node B 400 and client 600 respectively, so that node B 400 and client 600 recover their respective data. As another example, the Node B 400 may adopt RV0 in step S10, the UE 600 may adopt RV0 in step S20, and the relay station 500 may adopt RV1 in step S30. The foregoing redundancy versions RV0 and RV1 are merely examples and do not limit the present invention in any sense, and any different redundancy versions can be applied to the present invention. For example, Node B 400 and UE 600 can adopt any one of redundancy versions RV0, RV2, RV4...RV(2n) to send data in steps S10 and S20 respectively, in this case, relay station 500 in In step S30, the corresponding redundancy versions of RV1, RV3, RV5...RV(2n-1) are used to send the XOR result of the data, where n is an integer greater than or equal to 0. As a preferred manner, in the above example, different redundancy versions can be selected especially for the HARQ mode of type III. At this time, Node B 400 and UE 600 can adopt redundancy versions RV1, RV3, Any one of RV5...RV(2n-1) to send data, and the relay station 500 uses the corresponding redundancy version in RV0, RV2, RV4...RV(2n) to send the exclusive OR of data in step S30 result.

In the HARQ method and system for one-way/two-way relay according to the present invention, the relay station uses different redundancy versions to process the data to be forwarded, thereby introducing cooperative coding gain and further improving the reliability of data transmission.

While certain embodiments of the present invention have been shown and described, those skilled in the art will recognize that changes may be made to these embodiments without departing from the principles and spirit of the invention, wherein The scope is defined in the claims and their equivalents.

Claims (22)

1. HARQ method that is used for one-way junction, described method comprises:

According to predetermined redundancy versions RV data are sent to relay station at time slot 1 by Node B, simultaneously, user side listens to the data of transmission from Node B; And

Forward the data to user side at time slot 2 according to another redundancy versions that is different from described predetermined redundancy versions by relay station, thereby come the data of recovery nodes B transmission by user side based on data that receive and the data that listen to.

2. the method for claim 1 also comprises:

According to predetermined redundancy versions data are sent to relay station at time slot 3 by user side, simultaneously, Node B listens to the data of transmission from user side; And

Forward the data to Node B at time slot 4 according to another redundancy versions that is different from described predetermined redundancy versions by relay station, thereby recover the data that user side sends based on data that receive and the data that listen to by Node B.

3. the method for claim 1, wherein described predetermined redundancy versions is RV0, and described another redundancy versions is RV1.

4. the method for claim 1, wherein described predetermined redundancy versions is RV1, and described another redundancy versions is RV0.

5. the method for claim 1, wherein, described predetermined redundancy versions is any one among RV0, RV2, the RV4...RV (2n), and described another redundancy versions is the respective redundant version among RV1, RV3, the RV5...RV (2n-1), wherein, n is the integer more than or equal to 0.

6. as claim 1 or 5 described methods, wherein, in the HARQ of type-iii mode, described predetermined redundancy versions is any one among RV1, RV3, the RV5...RV (2n-1), described another redundancy versions is the respective redundant version among RV0, RV2, the RV4...RV (2n), wherein, n is the integer more than or equal to 0.

7. HARQ method that is used for two-way relaying, described method comprises:

According to predetermined redundancy versions RV data are sent to relay station at time slot 1 by Node B, simultaneously, user side listens to the data of transmission from Node B;

According to predetermined redundancy versions data are sent to relay station at time slot 2 by user side, simultaneously, Node B listens to the data of transmission from user side; And

According to another redundancy versions that is different from described predetermined redundancy versions the XOR result of data is sent to Node B and user side respectively at time slot 3 by relay station, thereby recover separately data based on the data that receive and the data that listen to by Node B and user side.

8. method as claimed in claim 7, wherein, described predetermined redundancy versions is RV0, described another redundancy versions is RV1.

9. method as claimed in claim 7, wherein, described predetermined redundancy versions is RV1, described another redundancy versions is RV0.

10. method as claimed in claim 7, wherein, described predetermined redundancy versions is any one among RV0, RV2, the RV4...RV (2n), and described another redundancy versions is the respective redundant version among RV1, RV3, the RV5...RV (2n-1), wherein, n is the integer more than or equal to 0.

11. as claim 7 or 10 described methods, wherein, in the HARQ of type-iii mode, described predetermined redundancy versions is any one among RV1, RV3, the RV5...RV (2n-1), described another redundancy versions is the respective redundant version among RV0, RV2, the RV4...RV (2n), wherein, n is the integer more than or equal to 0.

12. an one-way junction system that uses HARQ, it comprises: Node B, relay station and user side, and wherein, described relay station will arrive user side from the data forwarding of Node B, and described relay system is characterised in that:

Node B sends to relay station according to predetermined redundancy versions RV with data at time slot 1, and simultaneously, user side listens to the data of transmission from Node B; And

Relay station forwards the data to user side at time slot 2 according to another redundancy versions that is different from described predetermined redundancy versions, thereby is come the data of recovery nodes B transmission based on data that receive and the data that listen to by user side.

13. system as claimed in claim 2, wherein,

User side sends to relay station according to predetermined redundancy versions with data at time slot 3, and simultaneously, Node B listens to the data of transmission from user side; And

Relay station forwards the data to Node B at time slot 4 according to another redundancy versions that is different from described predetermined redundancy versions, thereby recovers the data that user side sends by Node B based on data that receive and the data that listen to.

14. system as claimed in claim 12, wherein, described predetermined redundancy versions is RV0, and described another redundancy versions is RV1.

15. system as claimed in claim 12, wherein, described predetermined redundancy versions is RV1, and described another redundancy versions is RV0.

16. system as claimed in claim 12, wherein, described predetermined redundancy versions is any one among RV0, RV2, the RV4...RV (2n), and described another redundancy versions is the respective redundant version among RV1, RV3, the RV5...RV (2n-1), wherein, n is the integer more than or equal to 0.

17. as claim 12 or 16 described systems, wherein, in the HARQ of type-iii mode, described predetermined redundancy versions is any one among RV1, RV3, the RV5...RV (2n-1), described another redundancy versions is the respective redundant version among RV0, RV2, the RV4...RV (2n), wherein, n is the integer more than or equal to 0.

18. a two-way relay system of using HARQ, it comprises: Node B, relay station and user side, and wherein, described relay station will send to Node B and user side respectively from the XOR result of the data of Node B and user side, and described relay system is characterised in that:

Node B sends to relay station according to predetermined redundancy versions RV with data at time slot 1, and simultaneously, user side listens to the data of transmission from Node B;

User side sends to relay station according to predetermined redundancy versions with data at time slot 2, and simultaneously, Node B listens to the data of transmission from user side; And

Relay station respectively sends to Node B and user side according to another redundancy versions that is different from described predetermined redundancy versions with the XOR result of data at time slot 3, thereby recovers separately data by Node B and user side based on the data that receive and the data that listen to.

19. system as claimed in claim 18, wherein, described predetermined redundancy versions is RV0, and described another redundancy versions is RV1.

20. system as claimed in claim 18, wherein, described predetermined redundancy versions is RV1, and described another redundancy versions is RV0.

21. method as claimed in claim 18, wherein, described predetermined redundancy versions is any one among RV0, RV2, the RV4...RV (2n), and described another redundancy versions is the respective redundant version among RV1, RV3, the RV5...RV (2n-1), wherein, n is the integer more than or equal to 0.

22. as claim 18 or 21 described systems, wherein, in the HARQ of type-iii mode, described predetermined redundancy versions is any one among RV1, RV3, the RV5...RV (2n-1), described another redundancy versions is the respective redundant version among RV0, RV2, the RV4...RV (2n), wherein, n is the integer more than or equal to 0.

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