METHOD FOR SIGNALING BACK-OFF INFORMATION IN RANDOM ACCESS

• US 20110216705A1
• Filed: 05/13/2011
• Published: 09/08/2011
• Est. Priority Date: 01/31/2008
• Status: Active Grant

• Current Assignee: Park Sung Jun, Seung-June Yi, Sung-Duck Chun, Young-Dae Lee
• Original Assignee: Park Sung Jun, Seung-June Yi, Sung-Duck Chun, Young-Dae Lee
• Inventors: LEE, Young Dae, Park, Sung Jun, Yi, Seung June, Chun, Sung Duck
• Granted Patent: US 8,422,510 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• 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 (RARs),

wherein the MAC header includes a first MAC sub-header followed by a second MAC sub-header,

wherein the first MAC sub-header includes a corresponding first 1-bit field directly followed by a corresponding second 1-bit field,

wherein the second MAC sub-header includes a corresponding first 1-bit field directly followed by a corresponding second 1-bit field,

wherein the first 1-bit field of the first MAC sub-header and/or the first 1-bit field of the second MAC sub-header indicates whether or not more fields are included in the MAC header,

wherein, when the second 1-bit field of the first MAC sub-header indicates the first MAC sub-header includes a backoff parameter, there is no MAC RAR corresponding to the first MAC sub-header in the random access response message, and

wherein, when the second 1-bit field of the second MAC sub-header indicates the second MAC sub-header includes a first random access preamble identifier, the random access response message includes a MAC RAR corresponding to the first random access preamble identifier.

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 of claim 1, wherein the second 1-bit field of the first MAC sub-header is directly followed by the backoff parameter.

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

receiving, by a network, a preamble for random access from a mobile station; and

transmitting, by the network, to the mobile station a random access response message 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 (RARs),

wherein the MAC header includes a first MAC sub-header followed by a second MAC sub-header,

wherein the first MAC sub-header includes a corresponding first 1-bit field directly followed by a corresponding second 1-bit field,

wherein the second MAC sub-header includes a corresponding first 1-bit field directly followed by a corresponding second 1-bit field,

wherein the first 1-bit field of the first MAC sub-header and/or the first 1-bit field of the second MAC sub-header indicates whether or not more fields are included in the MAC header,

wherein, when the second 1-bit field of the first MAC sub-header indicates the first MAC sub-header includes a backoff parameter, there is no MAC RAR corresponding to the first MAC sub-header in the random access response message, and

wherein, when the second 1-bit field of the second MAC sub-header indicates the second MAC sub-header includes a first random access preamble identifier, the random access response message includes a MAC RAR corresponding to the first random access preamble identifier.

6. The method of claim 5, wherein the backoff parameter in the random access response message is configured to enable the mobile terminal to perform backoff using the backoff parameter.

7. The method of claim 5, wherein the backoff parameter is a common backoff parameter or an exclusive backoff parameter to be used exclusively by the mobile terminal.

8. The method of claim 5, wherein the second 1-bit field of the first MAC sub-header is directly followed by the backoff parameter.

9. 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

receive 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 (RARs),

wherein the MAC header includes a first MAC sub-header followed by a second MAC sub-header,

wherein the first MAC sub-header includes a corresponding first 1-bit field directly followed by a corresponding second 1-bit field,

wherein the second MAC sub-header includes a corresponding first 1-bit field directly followed by a corresponding second 1-bit field,

wherein the first 1-bit field of the first MAC sub-header and/or the first 1-bit field of the second MAC sub-header indicates whether or not more fields are included in the MAC header,

wherein, when the second 1-bit field of the first MAC sub-header indicates the first MAC sub-header includes a backoff parameter, there is no MAC RAR corresponding to the first MAC sub-header in the random access response message, and

wherein, when the second 1-bit field of the second MAC sub-header indicates the second MAC sub-header includes a first random access preamble identifier, the random access response message includes a MAC RAR corresponding to the first random access preamble identifier.

10. The mobile terminal of claim 9, wherein the processor is configured to cause the mobile terminal to perform backoff using the backoff parameter in the random access response message.

11. The mobile terminal of claim 9, wherein the backoff parameter is a common backoff parameter or an exclusive backoff parameter to be used exclusively by the mobile terminal.

12. The mobile terminal of claim 9, wherein the second 1-bit field of the first MAC sub-header is directly followed by the backoff parameter.

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

a processor configured to

receive a preamble for random access from a mobile station, and

transmit to the mobile station a random access response message 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 (RARs),

wherein the MAC header includes a first MAC sub-header followed by a second MAC sub-header,

wherein the first MAC sub-header includes a corresponding first 1-bit field directly followed by a corresponding second 1-bit field,

wherein the second MAC sub-header includes a corresponding first 1-bit field directly followed by a corresponding second 1-bit field,

wherein the first 1-bit field of the first MAC sub-header and/or the first 1-bit field of the second MAC sub-header indicates whether or not more fields are included in the MAC header,

wherein, when the second 1-bit field of the first MAC sub-header indicates the first MAC sub-header includes a backoff parameter, there is no MAC RAR corresponding to the first MAC sub-header in the random access response message, and

wherein, when the second 1-bit field of the second MAC sub-header indicates the second MAC sub-header includes a first random access preamble identifier, the random access response message includes a MAC RAR corresponding to the first random access preamble identifier.

14. The network of claim 13, wherein the backoff parameter in the random access response message is configured to enable the mobile terminal to perform backoff using the backoff parameter.

15. The network of claim 13, wherein the backoff parameter is a common backoff parameter or an exclusive backoff parameter to be used exclusively by the mobile terminal.

16. The network of claim 13, wherein the second 1-bit field of the first MAC sub-header is directly followed by the backoff parameter.