Method for transmitting scheduling request effectively in wireless communication system

• US 8,243,667 B2
• Filed: 01/28/2009
• Issued: 08/14/2012
• Est. Priority Date: 01/28/2008
• Status: Active Grant

• Current Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chun, Sung-Duck, Yi, Seung-June, Park, Sung-Jun, Lee, Young-Dae
• Primary Examiner(s): MARCELO, MELVIN C
• Application Number:
  US12/361,176
• Publication Number:
  US 20090201868A1
• Time in Patent Office: 1,294 Days
• Field of Search: 370/329
• US Class Current: 370/329
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

The present invention relates to a wireless communication system providing a wireless communication and a mobile terminal. During data communication between a base station and a terminal in a long term evolution (LTE) system, while the terminal performs a random access channel (RACH) procedure for requesting a radio resource allocation from the base station, if the terminal is allocated with a radio resource using its radio terminal identifier, the terminal is allowed to appropriately select a radio resource, thereby preventing the consumption of radio resources and increasing efficiency.

Claims

1. A method of requesting a scheduling request (SR) for a shared uplink control channel resource in a wireless communication system, the method performed by a terminal and comprising:

determining whether or not the SR is triggered;

if the SR is determined to be triggered, determining whether or not an existing shared uplink control channel resource is assigned to the terminal'"'"'s Cell-Radio Network Temporary Identifier (C-RNTI); and

if no existing shared uplink control channel resource is determined to be available, performing the following operation;

determining whether or not a Physical Uplink Control Channel (PUCCH) is configured for the terminal;

if the PUCCH is configured for the terminal, sending the SR via the PUCCH for a predetermined number of time, and monitoring a Physical Downlink Control Channel (PDCCH) for a new shared uplink control channel resource that is assigned to the terminal'"'"'s C-RNTI; and

if the PUCCH is not configured for the terminal, initiating a random access procedure to obtain the new shared uplink control channel resource.

2. The method of claim 1, wherein the step of monitoring the Physical Downlink Control Channel (PDCCH) comprises:

if the new shared uplink control channel resource is not received after the predetermined number of times, releasing the PUCCH.

3. The method of claim 1, wherein the step of initiating the random access procedure comprises:

aborting the random access procedure if any shared uplink channel resource is received during the random access procedure.

4. The method of claim 1, further comprising:

repeating the operation until the new shared uplink control channel resource is obtained.

5. A terminal configured to request a scheduling request (SR) for a shared uplink control channel resource in a wireless communication system, the terminal comprising:

a transmit/receive unit; and

a processor operatively connected to the transmit/receive unit, the processor configured to determine whether or not the SR is triggered;

if the SR is determined to be triggered, determine whether or not an existing shared uplink control channel resource is assigned to the terminal'"'"'s Cell-Radio Network Temporary Identifier (C-RNTI); and

if no existing shared uplink control channel resource is determined to be available, perform the following operation;

determine whether or not a Physical Uplink Control Channel (PUCCH) is configured for the terminal;

if the PUCCH is configured for the terminal, send the SR via the PUCCH for a predetermined number of time, and monitoring a Physical Downlink Control Channel (PDCCH) for a new shared uplink control channel resource that is assigned to the terminal'"'"'s C-RNTI; and

if the PUCCH is not configured for the terminal, initiate a random access procedure to obtain the new shared uplink control channel resource.

6. The terminal of claim 5, wherein, if the new shared uplink control channel resource is not received after the predetermined number of times, the processor is configured to release the PUCCH.

7. The terminal of claim 5, wherein the processor is configured to abort the random access procedure if any shared uplink channel resource is received during the random access procedure.

8. The terminal of claim 5, wherein the processor is configured to repeat the operation until the new shared uplink control channel resource is obtained.