Method of performing random access procedure in wireless communication system

• US 8,432,812 B2
• Filed: 10/29/2008
• Issued: 04/30/2013
• Est. Priority Date: 10/29/2007
• 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:
  US12/681,481
• Publication Number:
  US 20100272035A1
• Time in Patent Office: 1,644 Days
• Field of Search: 370/236, 370/252, 370/324, 370/328, 370/331, 370/350
• US Class Current: 370/236
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 74/004 in the uplink, i.e. towards network
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

A method of performing random access procedure includes receiving information on a dedicated random access preamble, transmitting the dedicated random access preamble, and receiving a random access response comprising a random access preamble identifier corresponding to the dedicated random access preamble and a downlink radio resource assignment.

Claims

1. A method of performing a random access procedure in a wireless communication system, the method performed by a user equipment comprising:

receiving information regarding a dedicated random access preamble via a physical downlink control channel (PDCCH);

transmitting the dedicated random access preamble;

receiving a random access response via a physical downlink shared channel (PDSCH),

wherein the random access response includes a random access preamble identifier corresponding to the dedicated random access preamble and a downlink radio resource assignment, and

wherein the PDSCH is addressed by the PDCCH having a cyclic redundancy check (CRC) masked with a unique identifier; and

receiving downlink data using the downlink radio resource assignment via the PDSCH without monitoring an additional PDCCH.

2. The method of claim 1, wherein the downlink radio resource assignment comprises a resource assignment configured to receive the downlink data and information regarding hybrid automatic repeat request (HARQ) feedback transmission for the downlink data.

3. The method of claim 2, further comprising transmitting a HARQ feedback for the downlink data using the information regarding the HARQ feedback transmission.

4. The method of claim 1, further comprising transmitting hybrid automatic repeat request (HARQ) feedback for the downlink data using information received from system information.

5. The method of claim 1, further comprising transmitting hybrid automatic repeat request (HARQ) feedback for the downlink data using information received from a handover command message.

6. The method of claim 1, wherein a time alignment timer that is configured to enable uplink transmission expires prior to receiving the information regarding the dedicated random access preamble.

7. The method of claim 1, wherein the random access response further includes a time alignment value configured to adjust uplink time alignment.

8. The method of claim 1, wherein:

the random access response is a medium access control (MAC) protocol data unit (PDU) that comprises a MAC header and at least one MAC random access response (RAR),

the MAC header comprises at least one MAC subheader,

the at least one MAC subheader corresponds to a MAC RAR and comprises the random access preamble identifier, and

the MAC RAR comprises the downlink radio resource assignment.

9. The method of claim 8, wherein the MAC RAR further comprises a time alignment field and a downlink grant field configured to indicate the downlink radio resource assignment.

10. The method of claim 9, further comprising:

performing discontinuous reception (DRX) after receiving the random access response; and

discontinuing performance of the DRX when the downlink data is received.

11. The method of claim 9, wherein the time alignment field includes an uplink alignment value.

12. The method of claim 1, wherein the PDCCH is further addressed by a random access-radio network temporary identifier(RA-RNTI).