METHOD OF PERFORMING RANDOM ACCESS IN MOBILE COMMUNICATION SYSTEM AND APPARATUS FOR THE SAME

• US 20110194478A1
• Filed: 02/09/2011
• Published: 08/11/2011
• Est. Priority Date: 02/09/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Young Dae, CHUN, Sung Duck, PARK, Sung Jun, YI, Seung June, JUNG, Sung Hoon
• Granted Patent: US 8,797,935 B2
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A method of performing a random access in a mobile communication system and an apparatus for the same are disclosed. The method of performing a random access includes transmitting a random access preamble to a network node and receiving a random access response from the network node, wherein the random access response is received through a first subframe if the random access preamble is a dedicated preamble, and the random access response is received through a second subframe which is different from the first subframe if the random access preamble is a non-dedicated preamble.

Claims

1. A method of performing a random access in a mobile communication system, the method comprising:

transmitting a random access preamble to a network node; and

receiving a random access response from the network node,

wherein the random access response is received through a first subframe if the random access preamble is a dedicated preamble, and

the random access response is received through a second subframe which is different from the first subframe if the random access preamble is a non-dedicated preamble.

2. The method of claim 1, wherein the first subframe is a Multicast Broadcast over a Single Frequency Network (MBSFN) subframe.

3. The method of claim 1, wherein the second subframe is a non-Multicast Broadcast over a Single Frequency Network (non-MBSFN) subframe.

4. The method of claim 1, wherein the dedicated preamble is allocated through a Physical Downlink Control Channel (PDCCH) order.

5. The method of claim 1, further comprising:

monitoring a Relay-Physical Downlink Control Channel (R-PDCCH) if the random access preamble is the dedicated preamble.

6. The method of claim 5, wherein the monitoring step includes monitoring a Random Access-Radio Network Temporary Identifier (RA-RNTI) through the R-PDCCH.

7. The method of claim 2, wherein the MBSFN subframe is a backhaul subframe.

8. The method of claim 1, further comprising:

transmitting an uplink message to the network node after receiving the random access response; and

receiving a contention resolution message from the network node,

wherein the uplink message includes a relay node identifier.

9. The method of claim 1, further comprising:

stopping transmission to an user equipment (UE) during receiving the random access response if the random access preamble is the dedicated preamble.

10. The method of claim 8, wherein the relay node identifier being received through a Relay-Physical Downlink Control Channel (R-PDCCH) is used for a contention resolution if the random access preamble is the dedicated preamble.

11. A method of performing random access in a mobile communication system, the method comprising:

receiving a random access preamble from a relay node; and

transmitting a random access response to the relay node,

wherein the random access response is transmitted through a first subframe if the random access preamble is a dedicated preamble, and

the random access response is transmitted through a second subframe which is different from the first subframe if the random access preamble is a non-dedicated preamble.

12. The method of claim 11, wherein the first subframe is a Multicast Broadcast over a Single Frequency Network (MBSFN) subframe.

13. The method of claim 11, wherein the second subframe is a non-Multicast Broadcast over a Single Frequency Network (non-MBSFN) subframe.

14. The method of claim 11, wherein the dedicated preamble is allocated through a Physical Downlink Control Channel (PDCCH) order.

15. The method of claim 11, further comprising:

transmitting a Random Access-Radio Network Temporary Identifier (RA-RNTI) through a Relay-Physical Downlink Control Channel (R-PDCCH) if the random access preamble is the dedicated preamble.

16. The method of claim 12, wherein the MBSFN subframe is a backhaul subframe.

17. The method of claim 11, further comprising:

receiving an uplink message from the relay node after transmitting the random access response; and

transmitting a contention resolution message to the relay node,

wherein the uplink message includes a relay node identifier.

18. The method of claim 17, wherein the relay node identifier being transmitted through a Relay-Physical Downlink Control Channel (R-PDCCH) is used for a contention resolution if the random access preamble is the dedicated preamble.