METHOD FOR RE-DIRECTION OF UPLINK ACCESS

• US 20100067498A1
• Filed: 10/30/2007
• Published: 03/18/2010
• Est. Priority Date: 10/30/2006
• Status: Active Grant

• 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
• Granted Patent: US 8,520,644 B2
• Time in Patent Office: Days
• US Class Current: 370/336
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• 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
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for prompt re-direction of uplink access of a specific user equipment is disclosed. For initial random access to a network, if a user equipment transmits a preamble, which includes information related to random access, to a network node, the network node sends grant/rejection information of the preamble and re-direction information as a response message to the preamble. In comparison with the related art which controls a rush of an access request of the user equipment through a second response message from the network node, since the rush of an access request is controlled by a first response message in the present invention, it is possible to promptly deal with abnormal communication status, thereby improving communication efficiency.

Claims

1. A method for random access by a terminal in mobile communication system, the method comprising:

transmitting a first random access preamble to a network;

receiving from the network a random access response message comprising wait time information; and

retransmitting a second random access preamble to the network after certain amount of time that is based on the wait time information.

7. The method according to claim 1, wherein the first random access preamble comprises a signature for distinguishing the terminal from any other terminal.

8. The method according to claim 7, wherein retransmitting the second random access preamble is performed if the random access response message does not comprise a signature same to the signature of the first random access preamble, or if the terminal does not receive the random access response message comprising the signature same to the signature of the first random access preamble for a predetermined period.

10. The method to claim 1 wherein the wait time information has a parameter value to be used in calculating an actual wait time to be applied at determining the certain amount of time.

11. The method according to claim 1, if at least one of the first and the second random access preambles is collided with other random access preamble from any other terminal using same signature, same radio resource, and same time as at least one of the first and the second random access preambles, the method further comprises:

receiving a contention resolution message from the network.

12. The method according to claim 11, wherein

if the contention resolution message comprises a terminal identifier transmitted by the terminal in advance, the terminal establishes an uplink access with the network;

and

if the contention resolution message does not comprise the terminal identifier, the method further comprises retransmitting a third random access preamble.

23. The method according to claim 1, wherein the random access response message is identified by a RA-RNTI (Random Access-Radio Network Temporary Identifier).

24. The method according to claim 23, wherein the RA-RNTI is received through a L1/L2 control channel.

25. The method according to claim 1, wherein the random access response message comprising the wait time information is a negative response to the first random access preamble.

2-6. -6. (canceled)

9. (canceled)

13. A method for controlling a random access from at least one terminal by a network in mobile communication system, the method comprising:

receiving a random access preamble from the at least one terminal; and

transmitting to the at least one terminal a random access response message comprising wait time information,

wherein the wait time information is used for the at least one terminal to determine a retransmission timing of the random access preamble.

18. The method according to claim 13, wherein the random access preamble comprises a signature for distinguishing the at least one terminal from any other terminal.

19. The method according to claim 18, wherein the retransmission of the random access preamble is performed by the at least one terminal if the random access response message does not comprise a signature same to the signature of the random access preamble, or if the at least one terminal does not receive the random access response message comprising the signature same to the signature of the random access preamble for a predetermined period.

20. The method according to claim 13, wherein the random access response message is transmitted associated with a RA-RNTI (Random Access-Radio Network Temporary Identifier).

21. The method according to claim 20, wherein the RA-RNTI is transmitted through a L1/L2 control channel.

22. The method according to claim 13, wherein the random access response message comprising the wait time information is a negative response to the random access preamble.

14-17. -17. (canceled)