Automatic request apparatus and method for multihop system in broadband wireless access communication network

• US 20070124642A1
• Filed: 11/06/2006
• Published: 05/31/2007
• Est. Priority Date: 11/04/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jeon, Soo-Yong, Han, Ki-Young, Kwon, Young-Hoon, Yoon, Soon-Young, Son, Jong-Wuk, Cho, Jae-Hee, Bae, Chi-Sung, Cho, Dong-Ho, Suh, Kyung-Joo, Lee, Ki-Ho
• Granted Patent: US 7,987,409 B2
• Time in Patent Office: Days
• US Class Current: 714/749
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

Provided are an ARQ apparatus and method for a multihop system in a broadband wireless access communication system. The ARQ method of a relay includes determining if the relay successfully receives specific data from a source and transmitting the specific data to a destination; receiving feedback data from the destination and determining if the destination successfully receives the specific data; generating feedback data including data indicating if the relay and the destination successfully receive the specific data, and outputting the feedback data to the source; and retransmitting the specific data, when the relay successfully receives the specific data but the destination fails to receive the specific data. Accordingly, when the MH-BTS successfully receives the data from the source but the destination fails to receive the data, the source does not retransmit same data to the MH-BTS.

Claims

1. An automatic request (ARQ) apparatus of a source in a wireless access communication network, comprising:

a relay acknowledgement (ACK) analyzer for analyzing whether a relay successfully receives specific data or fails to receive the specific data;

a destination ACK analyzer for analyzing whether a destination successfully receives the specific data or fails to receive the specific data; and

a transmit data adjuster for performing retransmission when the relay fails to receive transmission data from the source.

2. The automatic request apparatus of claim 1, wherein when the relay successfully receives the transmission data and the destination fails to receive the transmission data, the transmit data adjuster waits for an ACK for the specific data from the destination for a preset time.

3. The automatic request apparatus of claim 1, wherein when the relay successfully receives the transmission data but the receiver fails to receive the specific data, the transmit data adjuster discards the transmission data if the transmit data adjuster does not receive an ACK for the specific data from the destination for a preset time.

4. The automatic request apparatus of claim 1, wherein the relay ACK analyzer assigns a bit size corresponding to a total number of hops to each block sequence number (BSN) according to data reception success/fail indicated by the BSN, thereby outputting if the relay successfully receives the specific data through information indicating the data reception success/fail in each hop, the information contained in ARQ feedback information element.

5. The automatic request apparatus of claim 4, wherein when a specific relay among a plurality of relays fails to receive the specific data, a bit size corresponding to number of hops until the relay successfully receiving the data is assigned to the information contained in the ARQ feedback information element.

6. The automatic request apparatus of claim 1, wherein the relay ACK analyzer assigns log₂(N+1) bits, where N is a total number of hops, to each BSN according to data reception success/fail indicated by the BSN, thereby outputting if the relay successfully receives the specific data through information indicating data reception success until a specific hop.

7. An automatic request (ARQ) apparatus of a relay in a wireless access communication network, comprising:

a feedback ACK analyzer for analyzing feedback data from a destination whether the destination successfully receives transmission data;

a transmit data adjuster for retransmitting the transmission data according to an analysis from the feedback ACK analyzer; and

a relay feedback data generator for generating feedback data indicating if the relay successfully receives the data transmitted from the source.

8. The automatic request apparatus of claim 7, wherein when the relay successfully receives the transmission data and the destination fails to receive the transmission data, the transmit data adjuster retransmits the transmission data.

9. The automatic request apparatus of claim 7, further comprising a feedback ACK processor for combining the analysis data from the feedback ACK analyzer and the feedback data from the transmit data adjuster and outputting feedback data to be transmitted to the source wherein the feedback ACK processor assigns a bit size corresponding to a total number of hops to each block sequence number (BSN) according to data reception success/fail indicated by the BSN, thereby outputting if the relay successfully receives the specific data through information indicating the data reception success/fail in each hop, the information contained in ARQ feedback information element.

10. The automatic request apparatus of claim 9, wherein when a specific relay among a plurality of relays fails to receive the specific data, a bit size corresponding to number of hops until the relay successfully receiving the data is assigned to the information contained in the ARQ feedback information element.

11. The automatic request apparatus of claim 7, wherein the relay ACK analyzer assigns log₂(N+1) bits, where N is a total number of hops, to each BSN according to data reception success/fail indicated by the BSN, thereby outputting if the relay successfully receives the specific data through information indicating data reception success until a specific hop.

12. An automatic request method of a relay in a wireless access communication network, comprising the steps of:

transmitting a transmission data from a source to a destination;

receiving a feedback data from the destination in response to the transmission data;

determining if the destination successfully receives the transmission data using the feedback data; and

retransmitting the transmission data to the destination when the destination fails to receive the first data.

13. The automatic request method of claim 12, further comprising the step of transmitting second feedback data including data indicating if the relay and the destination successfully receive the first data;

and

transmitting the second feedback data to the source.

14. The automatic request method of claim 13, wherein the step of generating the second feedback data includes assigning at least one bit which size is allocated corresponding to a total number of hops to each block sequence number (BSN) and which indicates success/fail for reception of data indicated by the BSN in each hop.

15. The automatic request method of claim 14, wherein assigning the at least one bit includes allocating a size of the bits as number of hops until the relay successfully receiving the data.

16. The automatic request method of claim 13, wherein the step of generating the second feedback data includes assigning log₂(N+1) bits, where N is a total number of hops, which indicate data reception success/fail indicated by the BSN until a specific hop.

17. An automatic request method of a source in a wireless access communication network, comprising the steps of:

transmitting first data to a relay;

receiving feedback data from the relay after the transmission of the first data;

determining if the relay successfully receives the first data, using the received feedback data;

determining if the destination successfully receives the first data, using the received feedback data;

retransmitting the first data according to the determination of reception failure by the relay for the first data; and

holding off retransmitting the first data according to the determination of reception success by the relay and the determination of reception failure by the destination for the first data.

18. The automatic request method of claim 17, wherein the feedback data includes a field which bit size is assigned corresponding to a total number of hops to each block sequence number (BSN) and which indicates success/fail for reception of data indicated by the BSN in each hop.

19. The automatic request method of claim 18, wherein the bit size of the field included in the feedback data is assigned as number of hops until the relay successfully receiving the data except when a specific relay among a plurality of relays fails to receive the specific data.

20. The automatic request method of claim 17, wherein the feedback data includes a field which is assigned to log₂(N+1) bits, where N is a total number of hops, indicating data reception success/fail indicated by the BSN until a specific hop.

21. An automatic request system in a wireless access communication network, comprising:

a source for determining if a relay successfully receives specific data by analyzing feedback data received from the relay, and performing the retransmission when the relay fails to receive the specific data;

the relay for transmitting the transmission data received from the source, determining if the destination successfully receives the transmission data by analyzing the feedback data received from the destination, and retransmitting the transmission data to the destination when the destination fails to receive the first data; and

the destination for receiving the data from the relay and transmitting the feedback data to the relay.

22. The automatic request system of claim 21, wherein the relay and the source assign a bit size corresponding to a total number of hops to each block sequence number (BSN) according to data reception success/fail indicated by the BSN, thereby outputting if the relay successfully receives the transmission data through information indicating the data reception success/fail in each hop, the information being contained in ARQ feedback information element.

23. The automatic request system of claim 22, wherein when a specific relay among a plurality of relays fails to receive the transmission data, a bit size corresponding to number of hops until the relay successfully receiving the data is assigned to the information contained in the ARQ feedback information element.

24. The automatic request system of claim 21, wherein the relay and the source assign log₂(N+1) bits, where N is a total number of hops, to each BSN according to data reception success/fail indicated by the BSN, thereby outputting if the relay successfully receives the transmission data through information indicating data reception success until a specific hop.