Method of performing random access procedure in wireless communication system

• US 8,837,438 B2
• Filed: 02/24/2009
• Issued: 09/16/2014
• Est. Priority Date: 02/25/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Sung Jun, Yi, Seung June, Lee, Young Dae, Chun, Sung Duck
• Primary Examiner(s): O CONNOR, BRIAN T
• Application Number:
  US12/391,845
• Publication Number:
  US 20090213818A1
• Time in Patent Office: 2,030 Days
• Field of Search: 370/336, 370/341, 370/348, 370/349, 370/350, 370/442, 455/435.1, 455/450
• US Class Current: 370/336
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 92/20 between access points

Abstract

A method and device for performing contention resolution between a mobile communication terminal and a base station. The method according to an embodiment includes initiating a random access procedure by a medium access control (MAC) layer of the mobile communication terminal, including starting a contention resolution timer; and stopping the contention resolution timer and determining that the random access procedure was successfully completed upon receipt from the base station of a physical downlink control channel (PDCCH) transmission addressed to a cell-radio network temporary identity (C-RNTI) of the mobile communication terminal and containing a UL grant.

Claims

1. A method of performing contention resolution associated with a random access procedure between a mobile communication terminal and a base station, comprising:

transmitting, by the mobile communication terminal, a random access preamble;

receiving, by the mobile communication terminal, a random access response;

transmitting, by the mobile communication terminal, an uplink message containing a cell-radio network temporary identity (C-RNTI) of the mobile communication terminal and starting a contention resolution timer once the uplink message is transmitted;

receiving, by the mobile communication terminal, a physical downlink control channel (PDCCH) transmission; and

considering, by the mobile communication terminal, the contention resolution to be successful and stopping the contention resolution timer if the PDCCH transmission is addressed to the C-RNTI and contains an uplink (UL) grant.

2. The method of claim 1, further comprising:

not stopping the contention resolution timer if the PDCCH transmission is addressed to the C-RNTI and does not contain the UL grant.

3. The method of claim 1, further comprising:

not considering the contention resolution to be successful if the PDCCH transmission is addressed to the C-RNTI and does not contain the UL grant.

4. The method of claim 1, wherein the random access procedure is initiated by the mobile communication terminal.

5. The method of claim 1, wherein the random access procedure is initiated by an UL data arrival.

6. A mobile communication terminal, comprising:

a display;

a transceiver; and

a processor operatively connected to the display and transceiver, the processor configured to perform contention resolution associated with a random access procedure, the processor further configured to

transmit a random access preamble,

receive a random access response,

transmit an uplink message containing a cell-radio network temporary identity (C-RNTI) of the mobile communication terminal and start a contention resolution timer once the uplink message is transmitted,

receive a physical downlink control channel (PDCCH), and

consider the contention resolution to be successful and stop the contention resolution timer if the PDCCH transmission is addressed to the C-RNTI and contains an uplink (UL) grant.

7. The mobile communication telininal of claim 6, wherein the processor is configured to not stop the contention resolution timer if the PDCCH transmission is addressed to the C-RNTI and does not contain the UL grant.

8. The mobile communication terminal of claim 6, wherein the processor is configured to not consider the contention resolution to be successful if the PDCCH transmission is addressed to the C-RNTI and does not contain the UL grant.

9. The mobile communication terminal of claim 6, wherein the random access procedure is initiated by the mobile communication terminal.

10. The mobile communication terminal of claim 6, wherein the random access procedure is initiated by an UL data arrival.