METHOD OF DOWNLINK HARQ OPERATION AT AN EXPIRY OF TIME ALIGNMENT TIMER

• US 20100296454A1
• Filed: 02/02/2009
• Published: 11/25/2010
• Est. Priority Date: 02/01/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yi, Seung-June, Park, Sung-Jun, Lee, Young-Dae, Chun, Sung-Duck
• Granted Patent: US 8,243,657 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1838 for semi-reliable protocols, e.g. for less sensitive applications such as streaming video buffer level management for video bitstream receiver H04N21/44004
• CPC Class Codes: H04L 1/1848 Time-out mechanisms
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

Disclosed is the radio (wireless) communication system providing a radio communication service and the terminal, and more particularly, to a method of a downlink HARQ (Hybrid Automatic Repeat reQuest) operation of terminal that is not time-aligned with the base station in an Evolved Universal Mobile Telecommunications System (E-UMTS) evolved from the Universal Mobile Telecommunications System (UMTS) or a Long Term Evolution (LTE) system.

Claims

1. A method of processing data for a HARQ (Hybrid Automatic Repeat Request) operation in a wireless communication system, the method comprising:

receiving a control signaling from a network;

receiving a data based on the received control signaling;

decoding the received data; and

generating a positive response message (ACK) if the received data is successfully decoded or a negative response message (NACK) if the received data is not successfully decoded, wherein the generated positive or negative response message is not transmitted to the network when a timer is expired or not running.

2. The method of claim 1, wherein the timer is a Time Alignment timer (TAT).

3. The method of claim 1, wherein the control signaling is a downlink assignment.

4. The method of claim 3, wherein the downlink assignment includes at least one of downlink scheduling information, a C-RNTI (Cell-Radio Network Temporary Identifier), and a Semi-persistent Scheduling C-RNTI.

5. The method of claim 1, wherein the data is a transport block (TB).

6. The method of claim 1, further comprising:

replacing data currently in a soft buffer with the received data after the data is received.

7. The method of claim 6, further comprising:

flushing the received data in the soft buffer when the positive response message is generated or when the timer is expired or not running.

8. The method of claim 1, further comprising:

flushing the received data in the soft buffer after the received data is decoded.

9. The method of claim 6, wherein the received data is kept in the soft buffer even when the timer is expired or not running.

10. A method of processing data for a HARQ (Hybrid Automatic Repeat Request) operation in a wireless communication system, the method comprising:

receiving a control signaling from a network;

receiving a data based on the received control signaling; and

discarding the received data when a timer is expired or not running.

11. The method of claim 10, wherein the timer is a Time Alignment timer (TAT).

12. The method of claim 10, wherein the control signaling is a downlink assignment.

13. The method of claim 12, wherein the downlink assignment includes at least one of downlink scheduling information, a C-RNTI (Cell-Radio Network Temporary Identifier), and a Semi-persistent Scheduling C-RNTI.

14. The method of claim 10, wherein the data is a transport block (TB).