Method of performing uplink time alignment in wireless communication system

• US 8,432,811 B2
• Filed: 09/26/2008
• Issued: 04/30/2013
• Est. Priority Date: 09/28/2007
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Sung Jun, Lee, Young Dae, Yi, Seung June, Chun, Sung Duck
• Primary Examiner(s): Yao, Kwang B
• Assistant Examiner(s): NGO, NGUYEN HOANG
• Application Number:
  US12/678,694
• Publication Number:
  US 20100195640A1
• Time in Patent Office: 1,677 Days
• Field of Search: 370/236, 370/252, 370/324, 370/328, 370/331, 370/350
• US Class Current: 370/236
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

A method of performing uplink time alignment in wireless communication system includes transmitting a random access preamble, receiving a random access response, the random access response comprising a random access preamble identifier corresponding to the random access preamble but no time alignment value, and restarting a time alignment timer according to receiving the random access response.

Claims

1. A method of performing uplink time alignment in a wireless communication system, the method comprising:

receiving a value of a time alignment timer from a base station, the value of the time alignment timer set to infinity in order to indicate that a current time alignment is correct;

transmitting a random access preamble to the base station;

receiving a random access response from the base station, the random access response comprising a random access preamble identifier corresponding to the random access preamble but no time alignment value; and

restarting the time alignment timer.

2. The method of claim 1, wherein the random access preamble is a dedicated random access preamble which is previously assigned by the base station.

3. The method of claim 1, wherein the time alignment timer is running before the random access preamble is transmitted.

4. The method of claim 1,

wherein the time alignment timer is restarted after receiving the value of the time alignment timer from the base station.

5. The method of claim 1,

wherein the time alignment timer is restarted after receiving the random access response from the base station.

6. The method of claim 1, wherein the value of the time alignment timer is received as a part of system information.

7. The method of claim 1, wherein the value of the time alignment timer is received through a handover command message.

8. The method of claim 1, wherein the random access response is a MAC (medium access control) PDU (protocol data unit), the MAC PDU comprising a MAC header and at least one MAC random access response (RAR), the MAC header comprising at least one MAC subheader, each of the at least one MAC subheader corresponding to a MAC RAR, one of the at least one MAC subheader comprising the random access preamble identifier.

9. The method of claim 8, wherein the MAC RAR comprises an uplink resource assignment and a temporary Cell-Radio Network Temporary Identity (C-RNTI).