Methods and apparatus for determining and/or communicating parameter switching point information in wireless communications systems including wireless terminals supporting multiple wireless connections

• US 7,558,572 B2
• Filed: 12/21/2005
• Issued: 07/07/2009
• Est. Priority Date: 12/21/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Anigstein, Pablo
• Primary Examiner(s): Tran; CongVan
• Application Number:
  US11/314,721
• Publication Number:
  US 20070142048A1
• Time in Patent Office: 1,294 Days
• Field of Search: 455/435.2, 455436-439, 455/67.11, 370/331, 370/332
• US Class Current: 455/435.2
• CPC Class Codes: H04L 27/2621 Reduction thereof using phase offsets between subcarriers
• CPC Class Codes: H04W 36/06 Reselecting a communication resource in the serving access point

Abstract

Methods and apparatus for indicating parameter change points with respect to multiple connections (wireless links) by transmitting a single message, e.g., over one of the connections, is described. A base station corresponding to at least one connection, considers the approximate timing relationship between the connections, selects one of the connections, selects an intended parameter switching point for that connection, determines a symbol time offset from the selected switching point such that the other intended switching points of other wireless links can be unambiguously interpreted by the wireless terminal from information indicating the offset with respect to the selected link, and communicates information indicating the offset and the wireless link to which said offset applies. A wireless terminal receives the information, identifies a time referenced with respect the timing structure of the identified wireless link and then determines individual parameter switching points for the other wireless links.

Claims

1. A method of operating wireless terminal to receive and process parameter switching point information, the method comprising:

receiving parameter switching point information over at least one of a plurality of wireless communications links corresponding to the wireless terminal, said switching point information indicating a point offset from a switching point;

determining a reference point in time from the received parameter switching point information corresponding to a first wireless communications link, said first wireless communications link being one of said plurality of wireless communications links; and

determining individual parameter switching points, the determined individual parameter switching points corresponding to different ones of said plurality of wireless communications links.

2. The method of claim 1, wherein determining individual parameter switching points is based on a predetermined relationship between the determined reference point and potential parameter switching points for the corresponding one of said plurality of wireless communications links.

3. The method of claim 2, wherein said determining individual parameter switching points includes using a function to determine said individual parameter switching points, said function being implemented in accordance with said predetermined relationship and using modular arithmetic computation.

4. The method of claim 2, wherein said determining of an individual parameter switching point includes selecting the last preceding potential parameter switching point corresponding to the one of said plurality of wireless communications links for which an individual parameter switching point is being determined.

5. The method of claim 4, wherein potential parameter switching points are super slot boundaries.

6. The method of claim 2, wherein the step of receiving parameter switching information includes receiving timing information referenced with respect to the first wireless communications link.

7. The method of claim 6, wherein said received timing information includes a superslot identifier and a symbol time identifier.

8. The method of claim 6, wherein receiving parameter switching information includes receiving information identifying which communications link is the first wireless communications link.

9. The method of claim 8, wherein the information identifying which communications link is the first wireless communications link includes a connection identifier.

10. The method of claim 1, wherein the step of receiving parameter switching information includes receiving timing information referenced with respect to a first wireless communications link, said first wireless communications link.

11. The method of claim 6, further comprising:

determining which communications link is the first communications link to which the received timing information corresponds based on the communications link over which the timing information was received.

12. The method of claim 1, further comprising:

switching from using an old parameter to a new parameter with respect to a plurality of communications links, said switching occurring on a link by link basis using the determined switching point corresponding to the link and stored switching protocol information.

13. The method of claim 9, wherein said parameter is an encryption parameter, said switching occurring on each link at points in time corresponding to encryption boundaries where said encryption parameter is permitted to change.

14. The method of claim 2, wherein the parameter is one of an encryption key, a request dictionary indicator, and a scrambling mask.

15. The method of claim 14, wherein said parameter is used for both an uplink and a downlink.

16. A wireless terminal, comprising:

a receiver for receiving parameter switching point information over at least one of a plurality of wireless communications links corresponding to the wireless terminal, said switching point information indicating a point offset from a switching point;

a reference point determination module for determining, from the received parameter switching point information, a reference point in time corresponding to a first one of said plurality of communications links; and

a switching point determination module for determining individual parameter switching points from said determined reference point, each determined individual parameter switching point corresponding to a different one of said plurality of wireless communications links.

17. The wireless terminal of claim 16, wherein said switching point determination module determines individual parameter switching points is based on a predetermined relationship between the determined reference point and potential parameter switching points for the corresponding one of said plurality of wireless communications links.

18. The wireless terminal of claim 17, wherein said determining individual parameter switching points includes using a function to determine said individual parameter switching points, said function being implemented in accordance with said predetermined relationship and using modular arithmetic computation.

19. The wireless terminal of claim 17, further including:

stored information indicating potential parameter switching points in a recurring communication link timing structure; and

wherein said switching point determination module selects, in a predetermined manner, a potential parameter switching point corresponding to the one of said plurality of wireless communications links for which an individual parameter switching point is being determined.

20. The wireless terminal of claim 19, wherein potential parameter switching points are super slot boundaries and wherein the predetermined manner includes selecting the last preceding superslot boundary occurring in the communications link preceding said reference point.

21. The wireless terminal of claim 17, wherein said parameter switching information includes timing information referenced with respect to a first wireless communications link, said first wireless communications link being one of said plurality of communications links, said received timing information includes a superslot identifier and a symbol time identifier.

22. The wireless terminal of claim 21, further comprising:

a link timing module for maintaining timing synchronization on a per link basis.

23. The wireless terminal of claim 19, further comprising:

a link determination module for determining which one of said plurality of links is the first link.

24. The wireless terminal of claim 23 wherein said link determination module determines which one of said plurality of links is the first link from link identification information included with said received parameter switching information.

25. The wireless terminal of claim 23 wherein said link determination module determines which one of said plurality of links is the first link based on which link said received parameter switching information was communicated to the wireless terminal.

26. The wireless terminal of claim 23, wherein the parameter is one of an encryption key, a request dictionary indicator, and a scrambling mask.

33. The wireless terminal of claim 21, further comprising:

link timing means for maintaining timing synchronization on a per link basis.

34. The wireless terminal of claim 19, further comprising:

a link determination means for determining which one of said plurality of links is the first link.

35. The wireless terminal of claim 34 wherein said link determination means determines which one of said plurality of links is the first link from link identification information included with said received parameter switching information.

36. The wireless terminal of claim 34 wherein said link determination means determines which one of said plurality of links is the first link based on which link said received parameter switching information was communicated to the wireless terminal.

37. The wireless terminal of claim 34, wherein the parameter is one of an encryption key, a request dictionary indicator, and a scrambling mask.

27. A wireless terminal, comprising:

means for receiving parameter switching point information over at least one of a plurality of wireless communications links corresponding to the wireless terminal, said switching point information indicating a point offset from a switching point;

means for determining, from the received parameter switching point information, a reference point in time corresponding to a first one of said plurality of communications links; and

means for determining individual parameter switching points from said determined reference point, each determined individual parameter switching point corresponding to a different one of said plurality of wireless communications links.

28. The wireless terminal of claim 27, wherein said means for determining individual parameter switching points determines individual parameter switching points based on a predetermined relationship between the determined reference point and potential parameter switching points for the corresponding one of said plurality of wireless communications links.

29. The wireless terminal of claim 28, wherein said means for determining individual parameter switching points uses a function to determine said individual parameter switching points, said function being implemented in accordance with said predetermined relationship and using modular arithmetic computation.

30. The wireless terminal of claim 28, further including:

stored information indicating potential parameter switching points in a recurring communication link timing structure; and

wherein said means for determining individual parameter switching points determines in a predetermined manner, a potential parameter switching point corresponding to the one of said plurality of wireless communications links for which an individual parameter switching point is being determined.

31. The wireless terminal of claim 30, wherein potential parameter switching points are super slot boundaries and wherein the predetermined manner includes selecting the last preceding superslot boundary occurring in the communications link preceding said reference point.

32. The wireless terminal of claim 28, wherein said parameter switching information includes timing information referenced with respect to a first wireless communications link, said first wireless communications link being one of said plurality of communications links, said received timing information includes a superslot identifier and a symbol time identifier.

38. A computer program product in a computer-readable medium encoded with instructions capable of being executed by a computer the computer program product operable to:

receive parameter switching point information over at least one of a plurality of wireless communications links corresponding to the wireless terminal, said switching point information indicating a point offset from a switching point;

determine a reference point in time from the received parameter switching point information corresponding to a first wireless communications link, said first wireless communications link being one of said plurality of wireless communications links; and

determine individual parameter switching points, the determined individual parameter switching points corresponding to different ones of said plurality of wireless communications links.

39. The computer program product of claim 38, wherein the individual parameter switching points are determined based on a predetermined relationship between the determined reference point and potential parameter switching points for the corresponding one of said plurality of wireless communications links.

40. The computer program product of claim 39, wherein the individual parameter switching points are determined using a function to determine said individual parameter switching points, said function being implemented in accordance with said predetermined relationship and using modular arithmetic computation.

41. The computer program product of claim 39, wherein the individual parameter switching point are determined by selecting the last preceding potential parameter switching point corresponding to the one of said plurality of wireless communications links for which an individual parameter switching point is being determined.

42. The computer program product of claim 41, wherein the potential parameter switching points are super slot boundaries.

43. The computer program product of claim 39, wherein the parameter switching information is determined by receiving timing information referenced with respect to the first wireless communications link.

44. The computer program product of claim 43, wherein the received timing information includes a superslot identifier and a symbol time identifier.

45. The computer program product of claim 43, wherein the parameter switching information is determined by receiving information identifying which communications link is the first wireless communications link.

46. The computer program product of claim 45, wherein the information identifying which communications link is the first wireless communications link includes a connection identifier.

47. The computer program product of claim 38, wherein the step parameter switching information is determined by receiving timing information referenced with respect to a first wireless communications link, said first wireless communications link.

48. The computer program product of claim 43 operable to determine which communications link is the first communications link to which the received timing information corresponds based on the communications link over which the timing information was received.

49. The computer program product of claim 38, operable to switch from using an old parameter to a new parameter with respect to a plurality of communications links, said switching occurring on a link by link basis using the determined switching point corresponding to the link and stored switching protocol information.

50. The computer program product of claim 46, wherein said parameter is an encryption parameter, said switching occurring on each link at points in time corresponding to encryption boundaries where said encryption parameter is permitted to change.

51. The computer program product of claim 39, wherein the parameter is one of an encryption key, a request dictionary indicator, and a scrambling mask.

52. The computer program product of claim 51, wherein said parameter is used for both an uplink and a downlink.