Method for signaling back-off information in random access

• US 8,027,356 B2
• Filed: 01/30/2009
• Issued: 09/27/2011
• Est. Priority Date: 01/31/2008
• 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
• Primary Examiner(s): Ngo; Ricky
• Assistant Examiner(s): KAO, WEI PO ERIC
• Application Number:
  US12/362,993
• Publication Number:
  US 20090201798A1
• Time in Patent Office: 970 Days
• Field of Search: 370/328, 370/445, 370/447, 370/448, 370/462
• US Class Current: 370/445
• 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 for performing random access in a wireless communication system is provided. The method includes transmitting a preamble for random access in uplink, receiving a random access response message including back-off information as a response to the preamble, and performing back-off using the back-off information when the random access has failed.

Claims

1. A method for performing a random access procedure in a wireless communication system, the method comprising:

transmitting a preamble for random access from a mobile station to a network; and

receiving by the mobile station a random access response message from the network as a response to the preamble, the random access response message having a MAC (Medium Access Control) header and zero or more MAC Random Access Responses (MAC RARs),

wherein the MAC header has a MAC sub-header, the MAC sub-header including a first 1-bit field and a second 1-bit field, the first 1-bit field being directly followed by the second 1-bit field,

wherein the first 1-bit field indicates whether or not an additional field is included in the MAC header,

wherein the second 1-bit field indicates whether or not the MAC sub-header has a random access preamble identifier or a backoff parameter, and

wherein when the second 1 bit field indicates the MAC sub-header has the random access preamble identifier, the MAC RARs have a MAC RAR corresponding to the random access preamble identifier, and when the second 1 bit field indicates the MAC sub-header has the backoff parameter, the random access response message has no MAC RAR.

2. The method of claim 1, further comprising:

performing backoff using the backoff parameter in the random access response message.

3. The method of claim 1, wherein the backoff parameter is a common backoff parameter or an exclusive backoff parameter to be used exclusively by the mobile terminal.

4. The method according to claim 1, wherein the second 1-bit field is followed by the backoff parameter.

5. The method according to claim 4, wherein the second 1-bit field is directly followed by the backoff parameter.

6. A method for performing a random access procedure in a wireless communication system, the method comprising:

receiving at a network a preamble for random access from a mobile terminal; and

transmitting by the network a random access response message to the mobile terminal as a response to the preamble, the random access response message having a MAC (Medium Access Control) header and zero or more MAC Random Access Responses (MAC RARs),

wherein the MAC header has a MAC sub-header, the MAC sub-header including a first 1-bit field and a second 1-bit field, the first 1-bit field being directly followed by the second 1-bit field,

wherein the first 1-bit field indicates whether or not an additional field is included in the MAC header,

wherein the second 1-bit field indicates whether or not the MAC sub-header has a random access preamble identifier or a backoff parameter, and

wherein when the second 1 bit field indicates the MAC sub-header has the random access preamble identifier, the MAC RARs have a MAC RAR corresponding to the random access preamble identifier, and when the second 1 bit field indicates the MAC sub-header has the backoff parameter, the random access response message has no MAC RAR.

7. The method of claim 6, wherein the backoff parameter in the random access response message is configured to enable the mobile terminal to perform backoff.

8. The method of claim 6, wherein the backoff parameter is a common backoff parameter or an exclusive backoff parameter to be used exclusively by the mobile terminal.

9. The method according to claim 6, wherein the second 1-bit field is followed by the backoff parameter.

10. The method according to claim 9, wherein the second 1-bit field is directly followed by the backoff parameter.

11. A mobile terminal configured to perform a random access procedure in a wireless communication system, comprising:

a processor configured to cause the mobile terminal to

transmit a preamble for random access to a network; and

process a random access response message received from the network as a response to the preamble, the random access response message having a MAC (Medium Access Control) header and zero or more MAC Random Access Responses (MAC RARs),

wherein the MAC header has a MAC sub-header, the MAC sub-header including a first 1-bit field and a second 1-bit field, the first 1-bit field being directly followed by the second 1-bit field,

wherein the first 1-bit field indicates whether or not an additional field is included in the MAC header,

wherein the second 1-bit field indicates whether or not the MAC sub-header has a random access preamble identifier or a backoff parameter, and

wherein when the second 1 bit field indicates the MAC sub-header has the random access preamble identifier, the MAC RARs have a MAC RAR corresponding to the random access preamble identifier, and when the second 1 bit field indicates the MAC sub-header has the backoff parameter, the random access response message has no MAC RAR.

12. The mobile terminal according to claim 11, wherein the second 1-bit field is followed by the backoff parameter.

13. The mobile terminal according to claim 12, wherein the second 1-bit field is directly followed by the backoff parameter.

14. A network configured to perform a random access procedure in a wireless communication system, comprising:

a processor configured to cause the network to

process a preamble for random access received from a mobile terminal; and

transmit a random access response message to the mobile terminal as a response to the preamble, the random access response message having a MAC (Medium Access Control) header and zero or more MAC Random Access Responses (MAC RARs),

wherein the MAC header has a MAC sub-header, the MAC sub-header including a first 1-bit field and a second 1-bit field, the first 1-bit field being directly followed by the second 1-bit field,

wherein the first 1-bit field indicates whether or not an additional field is included in the MAC header,

wherein the second 1-bit field indicates whether or not the MAC sub-header has a random access preamble identifier or a backoff parameter, and

wherein when the second 1 bit field indicates the MAC sub-header has the random access preamble identifier, the MAC RARs have a MAC RAR corresponding to the random access preamble identifier, and when the second 1 bit field indicates the MAC sub-header has the backoff parameter, the random access response message has no MAC RAR.

15. The network according to claim 14, wherein the second 1-bit field is followed by the backoff parameter.

16. The network according to claim 15, wherein the second 1-bit field is directly followed by the backoff parameter.