Reservation multiple access

• US 7,613,462 B2
• Filed: 10/17/2005
• Issued: 11/03/2009
• Est. Priority Date: 10/15/1998
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Vanghi, Vieri, Walton, Rod J., Willenegger, Serge
• Primary Examiner(s): ZEWDU, MELESS NMN
• Application Number:
  US11/252,858
• Publication Number:
  US 20060040702A1
• Time in Patent Office: 1,478 Days
• Field of Search: 4554351-4352, 455/403, 455/418, 455/422.1, 455/434, 455/453, 455447-451, 455/455, 455/466, 455463-464, 455502-503, 455524-526, 455 61- 62, 455/63.1, 455 59- 70, 455/550.1, 455560-561, 455/67.14, 455509-517, 455/522, 455/556.2, 455/574, 370/247, 370/271, 370/318, 370/322, 370328-329, 370437-438, 370461-462, 370335-336, 370/338, 370310-311, 370/312, 370341-342, 370/343, 370346-350, 370/443, 370444-445, 370447-449, 370/468, 370/470, 370/491
• US Class Current: 455/450
• CPC Class Codes: H04W 52/223 predicting future states of the transmission
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 52/60 using different transmission rates for TPC commands
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• 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

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:

selecting a signature sequence from a plurality of signature sequences;

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

determining if a channel assignment message, which is responsive to the access request and 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, wherein the plurality of signature sequences comprises a plurality of code sequences.

3. The method of claim 2, wherein determining if the channel assignment message is received comprises determining whether a message modulated with the code sequence is received from the base station.

4. The method of claim 1, wherein the plurality of signature sequences comprises a plurality of binary code sequences.

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

6. The method of claim 5, further comprising increasing a transmit power for transmitting the another access request, if the channel assignment message from the base station is not received.

7. The method of claim 1, wherein transmitting the another request comprises transmitting the another request after a random delay period, if the channel assignment message from the base station is not received.

8. 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.

9. 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.

10. The method of claim 1, wherein the plurality of signature sequences comprises 16 different 1 msec long signatures.

11. The method of claim 1, wherein transmitting the another access request comprises transmitting the another access request using the signature sequence.

12. The method of claim 1, wherein transmitting the access request utilizing the signature sequence comprises transmitting the access request modulated utilizing the signature sequence.

13. A mobile station comprising:

a controller configured to select a signature sequence from a plurality of signature sequences;

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

a transmitter configured to transmit the access request,

wherein the controller is further configured to determine if a channel assignment message, which is responsive to the access request and 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.

14. The mobile station of claim 13, wherein the plurality of signature sequences comprises a plurality of code sequences.

15. The mobile station of claim 14, wherein the controller determines if the channel assignment message is received by determining whether a message modulated with the code sequence is received from the base station.

16. The mobile station of claim 13, wherein the plurality of signature sequences comprises a plurality of binary code sequences.

17. The mobile station of claim 13, wherein the controller is configured to determine a random delay, if the channel assignment message from the base station is not received.

18. The mobile station of claim 17, 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.

19. The mobile station of claim 13, wherein the transmitter is configured to transmit the another request after a random delay period, if the channel assignment message from the base station is not received.

20. The mobile station of claim 13, wherein the channel assignment message comprises an assignment of a reserve access channel that provides a low probability of contention.

21. The mobile station of claim 13, wherein the plurality of signature sequences comprises 16 different 1 msec long signatures.

22. The mobile station of claim 13, wherein the transitter is configured to transmit the another access request modulated with the signature sequence.

23. The mobile station a mobile station of claim 13, wherein the transmitter is configured to transmit the access request modulated with the signature sequence.

24. An apparatus comprising:

means for selecting a signature sequence from a plurality of signature sequences;

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

means for determining if a channel assignment message, which is responsive to the access request and 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.

25. The apparatus of claim 24, wherein the plurality of signature sequences comprise a plurality of code sequences.

26. The apparatus of claim 25, wherein the means for determining comprises means for determining whether a message modulated with the code sequence is received from the base station.

27. The apparatus of claim 24, wherein the plurality of signature sequences comprise a plurality of binary code sequences.

28. The apparatus of claim 24, further comprising means for determining a random delay, if the channel assignment message from the base station is not received.

29. The apparatus of claim 28, 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.

30. The apparatus of claim 24, wherein the transmitter is configured to transmit the another request comprises transmitting the another request after a random delay period, if the channel assignment message from the base station is not received.

31. The apparatus of claim 24, 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.

32. The apparatus of claim 24, wherein the channel assignment message comprises an assignment of a reserve access channel that provides a low probability of contention.

33. The apparatus of claim 24, wherein the plurality of signature sequences comprises 16 different 1 msec long signatures.

34. The apparatus of claim 24, wherein the transmitter is configured to transmit the another access request using the signature sequence.

35. The apparatus of claim 24, wherein the transmitter is configured to transmit the access request modulated with the signature sequence.

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

instructions for selecting a signature sequence from a plurality of signature sequences;

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

instructions for determining if a channel assignment message, which is responsive to the access request and 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.

37. The computer-readable media of claim 36, wherein the computer-readable media comprises a memory.

38. The computer-readable media of claim 36, wherein the computer-readable media comprises programmable storage devices.

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

selecting a signature sequence from a plurality of signature sequences;

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

determining if a channel assignment message, which is responsive to the access request and includes a field which designates the signature sequence selected from the plurality of signature sequences, is received from the base station; and

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

40. The method of claim 39, wherein the field comprises N bits, and wherein the plurality of signature sequences comprises 2^N signature sequences.

41. The method of claim 39, wherein the plurality of signature sequences are ordered in a predefined order, and wherein the field enumerates the position of the selected signature within the predefined order.

42. A mobile station comprising:

a controller configured to select a signature sequence from a plurality of signature sequences;

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

a transmitter configured to transmit the modulated access request,

wherein the controller is further configured to determine if a channel assignment message, which is responsive to the access request and includes a field which designates the signature sequence selected from the plurality of signature sequences, is received from the base station, 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.

43. The mobile station of claim 42, wherein the field comprises N bits, and wherein the plurality of signature sequences comprises 2^N signature sequences.

44. The mobile station of claim 42, wherein the plurality of signature sequences are ordered in a predefined order, and wherein the field enumerates the position of the selected signature within the predefined order.

45. An apparatus comprising:

means for selecting a signature sequence from a plurality of signature sequences;

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

means for determining if a channel assignment message, which is responsive to the access request and includes a field which designates the signature sequence selected from the plurality of signature sequences, 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.

46. The apparatus of claim 45, wherein the field comprises N bits, and wherein the plurality of signature sequences comprises 2^N signature sequences.

47. The apparatus of claim 45, wherein the plurality of signature sequences are ordered in a predefined order, and wherein the field enumerates the position of the selected signature within the predefined order.

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

instructions for selecting a signature sequence from a plurality of signature sequences;

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

instructions for determining if a channel assignment message, which is responsive to the access request and includes a field which designates the signature sequence selected from the plurality of signature sequences, is received from a base station; and

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

49. The computer-readable media of claim 48, wherein the field comprises N bits, and wherein the plurality of signature sequences comprises 2^N signature sequences.

50. The computer-readable media of claim 48, wherein the plurality of signature sequences are ordered in a predefined order, and wherein the field enumerates the position of the selected signature within the predefined order.