Method of performing random access in a wireless communcation system

• US 8,428,013 B2
• Filed: 10/30/2007
• Issued: 04/23/2013
• Est. Priority Date: 10/30/2006
• 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
• Primary Examiner(s): Thier, Michael
• Assistant Examiner(s): HAILE, AWET A
• Application Number:
  US12/312,172
• Publication Number:
  US 20100067495A1
• Time in Patent Office: 2,002 Days
• Field of Search: 370/329, 370/335, 370/338, 370/342, 370/324, 370/350, 455/403, 455/450, 455/435.1
• US Class Current: 370/329
• 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
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method of performing random access in a wireless communication system is disclosed. The method of performing random access in a user equipment of a wireless communication system which uses multiple carriers includes transmitting a preamble for random access to a network, receiving a random access response message from the network in response to the preamble, transmitting a connection setup request message to the network, the connection setup request message requesting connection establishment with the network, and receiving a first message from the network, the first message including connection setup information and contention resolution information in a random access procedure. If a user equipment identifier of the user equipment is included in the message, the user equipment determines that it has successfully performed random access and performs a next procedure in accordance with the connection setup information. If the user equipment identifier of the user equipment is not included in the message, the user equipment determines that it has failed in random access and transmits a random access preamble to the network again after the lapse of a predetermined time period.

Claims

1. A method of performing random access by user equipment which is in an idle mode in a wireless communication system using multiple carriers, the method comprising:

transmitting a preamble for random access to a network to establish a radio resource control (RRC) connection with the network;

receiving a random access response message from the network in response to the preamble, the random access response message comprising uplink resource allocation information and a temporary identifier of the user equipment;

transmitting an RRC connection setup request message to the network through uplink resources allocated according to the uplink resource allocation information after receiving the random access response message, the RRC connection setup request message requesting connection establishment with the network, wherein the RRC connection setup request message comprises a first user equipment identifier;

receiving control information from the network on a control channel, the control information comprising a second user equipment identifier and associated with receiving a contention resolution message;

receiving the contention resolution message from the network using the control information when the second user equipment identifier is equal to the temporary identifier of the user equipment; and

receiving an RRC connection setup message from the network in response to the RRC connection setup request message,

wherein when the contention resolution message comprises the first user equipment identifier sent by the user equipment through the RRC connection setup request message, the user equipment considers the random access procedure to be successful and uses the temporary identifier of the user equipment as a private user equipment identifier (C-RNTI) for performing communications with the network.

2. The method of claim 1, wherein the first user equipment identifier is a wideband user equipment identifier.

3. The method of claim 2, wherein the wideband user equipment identifier is an international mobile subscriber identity (IMSI) or a temporary mobile subscriber identity (TMSI).

4. The method of claim 1, further comprising receiving signaling information necessary for receiving the random access response message on the control channel using a random access radio network temporary identifier (RA-RNTI) previously allocated by the network.

5. The method of claim 1, further comprising transmitting a random access preamble from the user equipment to the network when the contention resolution message does not comprise the first user equipment identifier sent by the user equipment through the connection setup request message.

6. User equipment which is in an idle mode and performs random access in a wireless communication system, the user equipment comprising:

a processor; and

a memory coupled to the processor, the memory comprising instructions which, when executed by the processor, cause the user equipment to;

transmit a preamble for random access to a network to establish a radio resource control (RRC) connection with the network;

receive a random access response message from the network in response to the preamble, the random access response message comprising uplink resource allocation information and a temporary identifier of the user equipment;

transmit an RRC connection setup request message to the network through uplink resources allocated according to the uplink resource allocation information after receiving the random access response message, the RRC connection setup request message requesting connection establishment with the network, wherein the RRC connection setup request message comprises a first user equipment identifier;

receive control information from the network on a control channel, the control information comprising a second user equipment identifier and associated with receiving a contention resolution message;

receive the contention resolution message from the network using the control information when the second user equipment identifier is equal to the temporary identifier of the user equipment; and

receive an RRC connection setup message from the network in response to the RRC connection setup request message,

wherein when the contention resolution message comprises the first user equipment identifier sent by the user equipment through the RRC connection setup request message, the user equipment considers the random access procedure to be successful and uses the temporary identifier of the user equipment as a private user equipment identifier (C-RNTI) for performing communications with the network.

7. The user equipment of claim 6, wherein the first user equipment identifier is a wideband user equipment identifier.

8. The user equipment of claim 7, wherein the wideband user equipment identifier is an international mobile subscriber identity (IMSI) or a temporary mobile subscriber identity (TMSI).

9. The user equipment of claim 6, wherein the user equipment is further configured to receive signaling information necessary for receiving the random access response message on the control channel using a random access radio network temporary identifier (RA-RNTI) previously allocated by the network.

10. The user equipment of claim 9, wherein the user equipment is further configured to transmit a random access preamble to the network when the contention resolution message does not comprise the first user equipment identifier sent by the user equipment through the connection setup request message.