METHOD OF HARQ ACKNOWLEDGEMENT TRANSMISSION AND TRANSPORT BLOCK RETRANSMISSION IN A WIRELESS COMMUNICATION SYSTEM

• US 20110205996A1
• Filed: 10/14/2009
• Published: 08/25/2011
• Est. Priority Date: 10/30/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Han, Seung Hee, Kim, Ki Hwan, Kwon, Yeong Hyeon, Chung, Jae Hoon
• Granted Patent: US 8,730,889 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/188 Time-out mechanisms
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method of transport block retransmission in a wireless communication system employing carrier aggregation is disclosed. A method of retransmitting transport blocks in a base station of a wireless communication system employing carrier aggregation comprises mapping each of a plurality of transport blocks to each of a plurality of component carriers using a first mapping pattern and transmitting the plurality of transport blocks to a mobile station; recognizing that the plurality of transport blocks are not transmitted successfully; and mapping each of the plurality of transport blocks to each of the plurality of component carriers using a second mapping pattern and retransmitting the plurality of transport blocks to the mobile station.

Claims

1. A method of retransmitting transport blocks in a base station of a wireless communication system employing carrier aggregation, the method comprising:

mapping each of a plurality of transport blocks to each of a plurality of component carriers using a first mapping pattern and transmitting the plurality of transport blocks to a mobile station;

recognizing that the plurality of transport blocks are not transmitted successfully; and

mapping each of the plurality of transport blocks to each of the plurality of component carriers using a second mapping pattern and retransmitting the plurality of transport blocks to the mobile station,

wherein the first mapping pattern is different from the second mapping pattern.

2. The method according to claim 1, wherein the second mapping pattern is a pattern generated by cyclic-shifting the first mapping pattern by a specific component carrier number.

3. The method according to claim 1, wherein the step of retransmitting includes transmitting control information for each of the plurality of transport blocks to the mobile station, the control information including a HARQ (Hybrid automatic repeat request) swap indicator which indicates a mapping pattern, which is different from the first mapping pattern, is used.

4. The method according to claim 3, wherein the control information includes a carrier selection bit indicating which component carrier a transmission block is transmitted through.

5. The method according to claim 1, wherein the step of transmitting includes mapping two or more transport blocks to each of the plurality of component carriers using a third mapping pattern and the step of retransmitting includes mapping the two or more transport blocks to each of the plurality of component carriers using the third mapping pattern.

6. The method according to claim 1, wherein the step of transmitting includes mapping two or more transport blocks to each of the plurality of component carriers using a third mapping pattern and the step of retransmitting includes mapping the two or more transport blocks to each of the plurality of component carriers using a forth mapping pattern.

7. The method according to claim 1, wherein the step of recognizing includes recognizing that the plurality of transport blocks is not transmitted successfully by receiving negative acknowledgement (NACK).

8. The method according to claim 1, wherein the step of recognizing includes recognizing that the plurality of transport blocks is not transmitted successfully by expiring a timer without receiving acknowledgement (ACK), wherein the timer is started immediately after transmitting the plurality of transport blocks.

9. A method of transmitting HARQ (Hybrid automatic repeat request)acknowledgement in a receiver of a wireless communication system employing carrier aggregation, the method comprising:

receiving data through a plurality of component carriers from a transmitter; and

transmitting a plurality of HARQ acknowledgements for the data to the transmitter via a uplink control channel.

10. The method according to claim 9, wherein the uplink control channel includes an indicator indicating that the uplink control channel carries the plurality of HARQ acknowledgements.

11. The method according to claim 9, wherein the uplink control channel carries only the plurality of HARQ acknowledgements, and the plurality of HARQ acknowledgements are masked or scrambled with a specific sequence which represents that the uplink control channel carries only the plurality of HARQ acknowledgements.

12. The method according to claim 9, wherein the uplink control channel carries only the plurality of HARQ acknowledgements, and the uplink control channel is configured to a predetermined format which represents that the uplink control channel carries only the plurality of HARQ acknowledgements.

13. A method of transmitting HARQ (Hybrid automatic repeat request) acknowledgement in a receiver of a wireless communication system employing carrier aggregation, the method comprising:

receiving data through a plurality of component carriers from a transmitter; and

transmitting an uplink control channel in which a plurality of HARQ acknowledgements for the data are mapped discontinuously to resource elements of SC-FDMA (Single carrier-Frequency Division Multiple Access) symbols just beside reference signals.