Apparatus and method for asynchronous control message transmission for data retransmission in wireless relay communication system

• US 8,462,690 B2
• Filed: 03/31/2008
• Issued: 06/11/2013
• Est. Priority Date: 03/30/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Chang, Young-Bin, Rakesh, Taori, Oh, Chang-Yoon, Lim, Hyoung-Kyu, Lee, Sung-Jin, Kang, Hyun-Jeong, Son, Jung-Je
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Elallam, Ahmed
• Application Number:
  US12/059,360
• Publication Number:
  US 20080240014A1
• Time in Patent Office: 1,898 Days
• Field of Search: 370/242, 370/243, 370/246, 370/293, 370/315, 714/48, 714/748, 714/749, 714/751, 455/7, 455/9, 455/13.1, 455/18, 455/24
• US Class Current: 370/315
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04L 1/0073 Special arrangements for feedback channel
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/1614 using bitmaps
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 2001/0097 Relays

Abstract

An apparatus and a method for data retransmission in a multihop relay wireless communication system are provided. The retransmission method includes determining whether an error is detected in data received from an upper node; generating a message indicative of the data error; and sending the message to the upper node at a time that is not appointed with the upper node. Therefore, it is possible to reduce a retransmission delay time that occurs during synchronous retransmission.

Claims

1. A retransmission method of a Relay Station (RS) in a wireless relay communication system, the method comprising:

receiving data from an upper node;

determining whether the data contains an error;

sending a Negative Acknowledgement (NACK) message to the upper node at a time that is not pre-appointed with the upper node, when the data contains an error;

transmitting the data to a lower node, when the data does not contain an error;

when a NACK is received from the lower node, forwarding the NACK to the upper node and retransmitting the data to the lower node; and

when an ACK is received from the lower node, forwarding the ACK to the upper node at a time that is pre-appointed with the upper node.

2. The retransmission method of claim 1, wherein sending the NACK message comprises:

generating the NACK message as a control message or a header, when the received data contains the error; and

sending the NACK message to the upper node at the time that is not pre-appointed with the upper node.

3. The retransmission method of claim 2, wherein generating the NACK message comprises:

when the NACK message is generated as the control message, generating the NACK message in response to corrupted data, and a NACK-type control message comprising additional information corresponding to the NACK message.

4. The retransmission method of claim 2, wherein the control message comprises at least one of a first unique IDentifier (ID) information corresponding to the RS, a second unique ID information corresponding to data indicative of the error, and, a third unique ID information corresponding to partial data if the data is the partial data.

5. The retransmission method of claim 2, wherein the control message comprises at least one of Connection ID (CID) information corresponding to the RS and Block Sequence Number (BSN) information corresponding to the data to indicate the error.

6. The retransmission method of claim 2, wherein, in a physical layer retransmission, the control message comprises at least one of a CID or a Reduced CID (ACID) of the RS, and a Hybrid Automatic Repeat reQuest (HARQ) Channel ID (ACID) of the data to indicate the error or a Sub Packet ID (SPID) of partial data of the ACID.

7. The retransmission method of claim 2, wherein the header comprises ACK information corresponding to at least one uncorrupted data unit, and NACK information corresponding to at least one corrupted data unit.

8. The retransmission method of claim 2, wherein the header comprises at least one of ID information corresponding to the RS, error occurrence information corresponding to at least one data unit provided from the upper node, repetition of error occurrence information, and information corresponding to a number of repetitions.

9. The retransmission method of claim 8, wherein the header comprises the error occurrence information corresponding to the data provided from the upper node as a bitmap.

10. The retransmission method of claim 9, wherein the header comprises a bitmap indicative of the error of the data in an order of data included in a downlink map provided from the upper node.

11. The retransmission method of claim 1, wherein the upper node is a base station or an upper RS.

12. The retransmission method of claim 1, further comprising:

when at least one of the NACK message and additional information corresponding to the NACK message is received from the lower node, checking data for the NACK message, transmitting at least one of the NACK message for the checked data and the additional information corresponding to the NACK message to the upper node; and

when retransmission-scheduling information is received from the upper node, retransmitting the checked data to the lower node according to the scheduling information or transmitting the scheduling information to the lower node.

13. The retransmission method of claim 1, wherein the lower node is a lower RS or a mobile station.

14. A Relay Station (RS) in a wireless relay communication system, comprising:

a receiver for receiving data from an upper node; and

a transmitter for sending a Negative Acknowledgement (NACK) message to the upper node at a time that is not pre-appointed with the upper node when the received data contains an error, transmitting the data to a lower node when the data does not contain an error, forwarding a NACK to the upper node and retransmitting the data to the lower node when the NACK is received from the lower node, and forwarding an ACK to the upper node at a time that is pre-appointed with the upper node when the ACK is received from the lower node.

15. The RS of claim 14, wherein the transmitter comprises a message generator for generating the NACK message of the received data as a control message or a header message, when the received data contains the error.

16. The RS of claim 15, wherein, when the NACK message is generated as the control message, the message generator generates the NACK message in response to corrupted received data and a NACK-type control message comprising additional information corresponding to the NACK message.

17. The RS of claim 15, wherein the message generator generates the control message, which comprises at least one of a first unique IDentifier (ID) information corresponding to the RS, a second unique ID information corresponding to data indicative of the error, and, a third unique ID information corresponding to partial data if the data is the partial data.

18. The RS of claim 15, wherein the message generator generates the control message, which comprises at least one of Connection ID (CID) information corresponding to the RS and Block Sequence Number (BSN) information corresponding to the data to indicate the error.

19. The RS of claim 15, wherein the message generator, in a physical layer retransmission, generates the control message, which comprises at least one of a CID or a Reduced CID (ACID) of the RS, and a Hybrid Automatic Repeat reQuest (HARQ) Channel ID (ACID) of the data indicative of the error or a Sub Packet ID (SPID) of partial data of the ACID.

20. The RS of claim 15, wherein the message generator generates the header message, which comprises ACK information corresponding to at least one uncorrupted data unit and NACK information corresponding to at least one corrupted data unit.

21. The RS of claim 15, wherein the message generator generates the header message which comprises at least one of ID information corresponding to the RS, error occurrence information corresponding to at least one unit of data provided from the upper node, repetition of the error occurrence information, and information corresponding to a number of repetitions.

22. The RS of claim 15, wherein the message generator generates the header message, which comprises the error occurrence information corresponding to the data provided from the upper node as a bitmap.

23. The RS of claim 22, wherein the message generator generates the header message, which comprises a bitmap indicative of the error in the data, in an order of data included to a downlink map provided from the upper node.

24. The RS of claim 14, wherein, when an error is not detected in the data received from the upper node, the transmitter forwards the data to a lower node.

25. The RS of claim 24, wherein the lower node is a lower RS or a mobile station.

26. The RS of claim 14, wherein the upper node is a base station or an upper RS.