Method of an uplink harq operation at an expiry of time alignment timer

• US 8,812,925 B2
• Filed: 10/04/2012
• Issued: 08/19/2014
• Est. Priority Date: 02/01/2008
• Status: Expired

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chun, Sung-Duck, Yi, Seung-June, Park, Sung-Jun, Lee, Young-Dae
• Primary Examiner(s): Bonzo, Bryce
• Assistant Examiner(s): Mehrmanesh, Elmira
• Application Number:
  US13/645,302
• Publication Number:
  US 20130061105A1
• Time in Patent Office: 684 Days
• Field of Search: 714/748, 714/749
• US Class Current: 714/748
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1835 Buffer management
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 1/1874 Buffer management
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Disclosed is the radio (wireless) communication system providing a radio communication service and the terminal, and more particularly, to a method of an uplink HARQ (Hybrid Automatic Repeat reQuest) operation at an expiry of time alignment timer 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:

storing a data unit into a corresponding HARQ buffer; and

flushing the stored data unit in the corresponding HARQ buffer when a timer expires,

wherein the timer is a time alignment timer (TAT) which is used to control how long a UE (User Equipment) is considered to have an uplink time that is aligned,

wherein the stored data unit in the corresponding HARQ buffer is flushed as a result of the expired time for which the UE is considered to have the uplink time that is aligned,

wherein the stored data unit is a Medium Access Control (MAC) Protocol Data Unit (PDU), and

wherein the TAT is started when a time advance command (TAC) is received from the network.

2. The method of claim 1, further comprising:

receiving an uplink grant from a network; and

generating a data unit based on the received uplink grant.

3. The method of claim 2, wherein the uplink grant is received on a PDCCH (Physical Downlink Control Channel).

4. The method of claim 2, wherein the uplink grant includes at least one of uplink scheduling information, a C-RNTI (Cell-Radio Network Temporary Identifier), and a Semi-persistent Scheduling C-RNTI.

5. The method of claim 2, wherein any configured downlink assignments and the uplink grant are cleared when the timer expires.

6. The method of claim 1, wherein the corresponding HARQ buffer is one of all HARQ buffers.

7. The method of claim 6, wherein the all HARQ buffers are flushed when the timer expires.

8. The method of claim 1, wherein a PUCCH/SRS resources are released when the timer expires.

9. The method of claim 7, wherein a RRC (Radio Resource Control) layer is notified to release the PUCCH/SRS resources.

10. A user equipment (UE) using a HARQ (Hybrid Automatic Repeat reQuest) operation in a wireless communication system, the UE comprising:

a controller configured to;

store a data unit into a corresponding HARQ buffer; and

flush the stored data unit in the corresponding HARQ buffer when a timer expires,

wherein the timer is a time alignment timer (TAT) which is used to control how long the UE is considered to have an uplink time that is aligned,

wherein the stored data unit in the corresponding HARQ buffer is flushed as a result of the expired time for which the UE is considered to have the uplink time that is aligned,

wherein the stored data unit is a Medium Access Control (MAC) Protocol Data Unit (PDU), and

wherein the TAT is started when a time advance command (TAC) is received from the network.

11. The user equipment (UE) of claim 10, wherein the controller further configured to:

receive an uplink grant from a network, and generate a data unit based on the received uplink grant.

12. The user equipment (UE) of claim 11, wherein the uplink grant is received on a PDCCH (Physical Downlink Control Channel).

13. The user equipment (UE) of claim 11, wherein the uplink grant includes at least one of uplink scheduling information, a C-RNTI (Cell-Radio Network Temporary Identifier), and a Semi-persistent Scheduling C-RNTI.

14. The user equipment (UE) of claim 11, wherein any configured downlink assignments and the uplink grant are cleared when the timer expires.

15. The user equipment (UE) of claim 10, wherein the corresponding HARQ buffer is one of all HARQ buffers.

16. The user equipment (UE) of claim 15, wherein the all HARQ buffers are flushed when the timer expires.

17. The user equipment (UE) of claim 10, wherein a PUCCH/SRS resources are released when the timer expires.

18. The user equipment (UE) of claim 17, wherein a RRC (Radio Resource Control) layer is notified to release the PUCCH/SRS resources.