Method of handling an uplink synchronization timer during a handover in wireless communication system

• US 8,724,568 B2
• Filed: 02/26/2010
• Issued: 05/13/2014
• Est. Priority Date: 03/13/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Jung, Sung-Hoon, Chun, Sung-Duck, Yi, Seung-June, Lee, Young-Dae, Park, Sung-Jun
• Primary Examiner(s): PARK, JUNG H
• Application Number:
  US13/201,444
• Publication Number:
  US 20110310845A1
• Time in Patent Office: 1,537 Days
• US Class Current: 370/329
• CPC Class Codes: H04W 36/0072 of resource information of target access point
• CPC Class Codes: H04W 36/385 of the core network

Abstract

Disclosed is the radio (wireless) communication system providing a radio communication service and the terminal, and more particularly, to a method of handling an uplink synchronization timer during a handover procedure 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 performing a handover procedure in a wireless communications system, the method comprising:

receiving a handover command from a network;

determining whether a default Medium Access Control (MAC) configuration is included in the received handover command, wherein the default MAC configuration is different from an explicit MAC configuration and is a predetermined value set between a terminal and the network;

receiving a timer alignment timer (TAT) value from the network when it is determined that the default MAC configuration is included; and

performing the handover procedure with the network using the default MAC configuration and the received TAT value.

2. The method of claim 1, wherein the TAT value is included in the received handover command.

3. The method of claim 1, wherein the TAT value is obtained from broadcast information received from the network.

4. The method of claim 3, wherein the broadcast information is received from a target base station or a target cell.

5. The method of claim 1, wherein the received handover command includes at least a target cell identification, target cell access information, a security configuration, or a measurement configuration.