RESERVATION MULTIPLE ACCESS

• US 20090137262A1
• Filed: 02/05/2009
• Published: 05/28/2009
• Est. Priority Date: 10/15/1998
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Vanghi, Vieri, Willenegger, Serge, Walton, Rod J.
• Granted Patent: US 8,014,805 B2
• Time in Patent Office: Days
• US Class Current: 455/515
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

A mobile station accesses a base station by randomly selecting a first reverse link common control channel from a set of random access channels. The mobile station transmits a request portion of an access probe over the first reverse link common control channel. The request portion is subject to collision with other signals. The request portion comprises a hash identification which is derived from a uniquely identifying number using a hash function. The hash identification quasi-uniquely identifies the mobile station. The mobile station receives a channel assignment message from the base station designating the hash identification and a reserved access channel. The reserved access channel provides communication with a low probability of contention. The mobile station transmits a message portion of the access probe over the reserved access channel.

Claims

1. A method for accessing a base station performed at a mobile station in a communication system, comprising:

transmitting an access request utilizing a selected signature sequence from the mobile station;

determining if a channel assignment message, which is responsive to the access request and reflects is modulated with at least one of the selected signature sequence or a signature associated with the selected signature, is received from the base station; and

transmitting another access request, if the channel assignment message is determined as not being received.

2. The method of claim 1, further comprising determining a random delay, if the channel assignment message from the base station is not received.

3. The method of claim 2, further comprising increasing a transmit power for transmitting the another access request, if the channel assignment message from the base station is not received.

4. The method of claim 1, wherein the channel assignment message comprises a power control correction value and the method further comprising adjusting a transmit power of future transmissions, from the mobile station, based upon the power control correction value.

5. The method of claim 1, wherein the channel assignment message comprises an assignment of a reserve access channel that provides a low probability of contention.

6. A mobile station comprising:

a modulator configure to modulate a selected signature sequence in an access request;

a transmitter configured to transmit the access request; and

a controller configured to determine if a channel assignment message, which is responsive to the access request and reflects is modulated with at least one of the selected signature sequence or a signature associated with the selected signature, from a base station is received and wherein the transmitter is configured to transmit another access request, if the channel assignment message is determined as not being received by the controller.

7. The mobile station of claim 6, wherein the controller is configured to determine a random delay, if the channel assignment message from the base station is not received.

8. The mobile station of claim 7, wherein the transmitter is configured to increase a transmit power for transmitting the another access request, if the channel assignment message from the base station is not received.

9. The mobile station of claim 6, wherein the channel assignment message comprises a power control correction value and the controller is further configured to adjust a transmit power of future transmissions, from the mobile station, based upon the power control correction value.

10. The mobile station of claim 6, wherein the channel assignment message comprises an assignment of a reserve access channel that provides a low probability of contention.

11. An apparatus comprising:

means for transmitting an access request utilizing a selected signature sequence from a mobile station;

means for determining if a channel assignment message, which is responsive to the access request and reflects is modulated with at least one of the selected signature sequence or a signature associated with the selected signature, is received from a base station; and

a transmitter configured to transmit another access request, if the channel assignment message is determined as not being received.

12. The apparatus of claim 11, further comprising means for determining a random delay, if the channel assignment message from the base station is not received.

13. The apparatus of claim 12, further comprising means for increasing a transmit power for transmitting the another access request, if the channel assignment message from the base station is not received.

14. The apparatus of claim 11, wherein the channel assignment comprises a power control correction value and the apparatus further comprising means for adjusting a transmit power of future transmissions, from the mobile station, based upon the power control correction value.

15. The apparatus of claim 11, wherein the channel assignment message comprises an assignment of a reserve access channel that provides a low probability of contention.

16. A computer-readable media comprising instructions that are utilized by a controller, the instructions comprising:

instructions for transmitting an access request utilizing a selected signature sequence from the mobile station;

instructions for determining if a channel assignment message, which is responsive to the access request and reflects is modulated with at least one of the selected signature sequence or a signature associated with the selected signature, is received from a base station; and

instructions for transmitting another access request, if the channel assignment message is determined as not being received.

17. The computer-readable media of claim 16, further comprising instructions for determining a random delay, if the channel assignment message from the base station is not received.

18. The computer-readable media of claim 17, further comprising instructions for increasing a transmit power for transmitting the another access request, if the channel assignment message from the base station is not received.

19. The computer-readable media of claim 16, wherein the channel assignment comprises a power control correction value and the computer-readable media further comprising instructions for adjusting a transmit power of future transmissions, from the mobile station, based upon the power control correction value.

20. The computer-readable media of claim 16, wherein the channel assignment message comprises an assignment of a reserve access channel that provides a low probability of contention.