Method and apparatus for performing automatic retransmission request in a mobile communication system

• US 20070280193A1
• Filed: 04/16/2007
• Published: 12/06/2007
• Est. Priority Date: 04/14/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Soeng-Hun, Velde, Himke, Lieshout, Gert-Jan
• Granted Patent: US 7,921,347 B2
• Time in Patent Office: Days
• US Class Current: 370/349
• CPC Class Codes: H04L 1/1678 where the control information is for timing, e.g. time stamps
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements

Abstract

A method and an apparatus are provided for performing Automatic Retransmission reQuest (ARQ) in a mobile communication system including an ARQ layer and a Hybrid ARQ (HARQ) layer. The method includes receiving from an ARQ receiving (Rx) entity a status report indicating a reception status of ARQ packets; detecting an ARQ packet having a transmission completion time going ahead of a generation time of the status report, among the ARQ packets whose transmission was completed by an ARQ transmitting (Tx) entity; and retransmitting an ARQ packet not ACK/NACK-ed by the status report, among the detected ARQ packets.

Claims

1. A method for performing Automatic Retransmission reQuest (ARQ) in a mobile communication system including an ARQ layer and a Hybrid ARQ (HARQ) layer, the method comprising:

receiving from an ARQ receiving (Rx) entity a status report indicating a reception status of ARQ packets;

detecting an ARQ packet having a transmission completion time going ahead of a generation time of the status report, among the ARQ packets whose transmission was completed by an ARQ transmitting (Tx) entity; and

retransmitting an ARQ packet not ACK/NACK-ed by the status report, among the detected ARQ packets.

2. The method of claim 1, further comprising:

acquiring a generation time of the status report from a timestamp included in the status report.

3. The method of claim 1, further comprising:

determining, as a generation time of the status report, a time at which an HARQ packet containing the status report was initially received.

4. The method of claim 1, further comprising:

discarding the ARQ packets ACK-ed by the status report, and clearing a transmission completion time of the ACK-ed ARQ packets; and

retransmitting the ARQ packets NACK-ed by the status report.

5. The method of claim 1, wherein the status report includes the sequence numbers of the ARQ packets successfully received up to a generation time of the status report, and the sequence numbers of the ARQ packets reception-failed up to the generation time of the status report.

6. An apparatus for performing Automatic Retransmission reQuest (ARQ) in a mobile communication system including an ARQ layer and a Hybrid ARQ (HARQ) layer, the apparatus comprising:

a framing unit for generating ARQ packets by framing a packet from an upper layer;

a retransmission buffer for storing copies of the ARQ packets for transmission thereof;

a multiplexer for multiplexing the ARQ packets into an HARQ packet;

an HARQ processor for transmitting the HARQ packet according to an HARQ process, and recording a transmission completion time of the HARQ packet;

a transceiver for modulating the HARQ packet into a radio signal before transmission, and demodulating the HARQ packet, received from an ARQ receiving (Rx) entity, including a status report indicating a reception status of the ARQ packets; and

a controller for detecting an ARQ packet having a transmission completion time going ahead of a generation time of the status report, among the ARQ packets stored in the retransmission buffer, and controlling the retransmission buffer so as to output an ARQ packet not ACK/NACK-ed by the status report, among the detected ARQ packets.

7. The apparatus of claim 6, wherein the controller acquires a generation time of the status report from a timestamp included in the status report.

8. The apparatus of claim 6, wherein the controller determines, as a generation time of the status report, a time at which an HARQ packet containing the status report was initially received.

9. The apparatus of claim 6, wherein the controller:

discards the ARQ packets ACK-ed by the status report from the retransmission buffer, and clears a transmission completion time of the ACK-ed ARQ packets; and

controls the retransmission buffer so as to output the ARQ packets NACK-ed by the status report.

10. The apparatus of claim 6, wherein the status report includes the sequence numbers of the ARQ packets successfully received up to a generation time of the status report, and the sequence numbers of the ARQ packets reception-failed up to the generation time of the status report.