Resource allocation during tune-away

• US 20070099614A1
• Filed: 10/27/2005
• Published: 05/03/2007
• Est. Priority Date: 10/27/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ulupinar, Fatih, Prakash, Rajat, Parekh, Nileshkumar
• Granted Patent: US 9,247,467 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 36/00837 Determination of triggering parameters for hand-off
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A resource assignment method during a tune-away procedure comprises determining a first instance in time that a tune-away will initiate with respect to an access terminal, determining a second instance in time that corresponds to a latest frame boundary associated with the access terminal prior to the instance in time that the tune-away initiates, and determining resource assignment parameters associated with the access terminal and implementing the resource assignment parameters at the second instance in time. The method can further comprise ceasing communications to the access terminal over a forward link at the second instance in time and discontinuing monitoring reverse link control channels associated with the access terminal at the second instance in time.

Claims

1. A resource assignment method during a tune-away procedure, comprising:

determining a first instance in time that a tune-away will initiate with respect to an access terminal;

determining a second instance in time that corresponds to a latest frame boundary associated with the access terminal prior to the instance in time that the tune-away initiates; and

determining resource assignment parameters associated with the access terminal and implementing the resource assignment parameters at the second instance in time.

2. The method of claim 1, further comprising maintaining a resource assignment between the access terminal and an access point for a duration of the tune-away.

3. The method of claim 1, further comprising suspending communications to the access terminal over a forward link at the second instance in time.

4. The method of claim 1, further comprising suspending monitoring reverse link control channels associated with the access terminal at the second instance in time.

5. The method of claim 1, further comprising:

implicitly expiring an assignment of resources between the access terminal and an access point at the second instance in time; and

explicitly re-assigning resources from the access terminal to at least one disparate access terminal beginning at the second instance in time.

6. The method of claim 5, further comprising:

caching data intended for the access terminal during the tune-away; and

providing the access terminal with the data upon completion of the tune-away.

7. The method of claim 1, the tune-away is an inter-frequency tune-away.

8. The method of claim 1, the tune-away is an inter-technology tune-away.

9. The method of claim 1, further comprising:

expiring an assignment of resources between the access terminal and an access point during the tune-away;

determining a duration of the tune-away; and

determining a third instance in time that corresponds to a frame boundary that occurs immediately after the duration of the tune-away.

10. The method of claim 9, further comprising:

re-assigning the resources to the access terminal at the third instance in time;

delivering data to the access terminal over a forward link after the re-assignment of resources; and

monitoring reverse link control channels after the re-assignment of resources.

11. The method of claim 1, further comprising:

expiring reverse link and forward link resource assignments at the access terminal at the second instance in time;

suspending transmissions in a reverse link at the access terminal after the resource assignments have been expired; and

suspending monitoring on a forward link at the access terminal after the resource assignments have been expired.

12. The method of claim 1, further comprising:

determining periodicity of tune-aways with respect to the access terminal; and

scheduling resource assignments in a sector as a function of the determined periodicity.

13. The method of claim 1, further comprising determining a tune-away schedule associated with the access terminal.

14. The method of claim 1, further comprising updating an active set as a function of parameters associated with the tune-away.

15. The method of claim 1, further comprising:

analyzing a service utilized by the access terminal; and

determining resource assignment parameters as a function of the service.

16. The method of claim 1, further comprising:

monitoring length of time associated with the tune-away; and

disconnecting the access terminal from an access point if the length of time is above a defined threshold.

17. The method of claim 1, further comprising optimizing resource allocations prior to the tune-away.

18. The method of claim 1, further comprising optimizing resource allocations upon completion of the tune-away.

19. The method of claim 1, further comprising automatically assigning resources associated with a reverse link as a function of a most recently reported reverse link queue size of the access terminal.

20. A wireless communications apparatus, comprising:

a memory that includes a schedule for a tune-away with respect to an access terminal; and

a processor that determines a frame boundary that occurs in time immediately prior to a time of commencement of the tune-away and implicitly expires resource assignments for the access terminal at a time that corresponds to the determined frame boundary at an access point associated therewith as a function of content of the schedule.

21. The apparatus of claim 20, further comprising a data storage unit that includes data cached during the tune-away.

22. The apparatus of claim 20, the processor causes transmissions to be suspended on a forward link as a function of the content of the schedule.

23. The apparatus of claim 20, the processor causes monitoring of a reverse link to be suspended as a function of the content of the schedule.

25. The apparatus of claim 20, the processor is employed to determine a frame boundary that occurs in time immediately subsequent to completion of the tune-away.

24. (canceled)

26. An apparatus for allocating base station resources during a tune-away, comprising:

means for determining when an access terminal is going to undertake a tune-away; and

means for allocating resources to one or more disparate access terminals during the tune-away.

27. The apparatus of claim 26, further comprising means for caching data intended for the access terminal during the tune-away.

28. The apparatus of claim 27, further comprising means for providing the access terminal with the cached data upon completion of the tune-away.

29. The apparatus of claim 26, further comprising means for expiring resource assignments implicitly at a frame boundary prior to the tune-away.

30. The apparatus of claim 29, further comprising means for re-establishing the resource assignments in a frame subsequent to the tune-away.

31. A computer-readable medium having stored thereon computer-executable instructions for:

receiving an indication that a tune-away will occur at time t1;

locating a latest frame boundary that occurs at a first point in time prior to t1;

implicitly expiring reverse link resource assignments at the first point in time;

implicitly expiring forward link resource assignments at the first point in time;

suspending transmissions on a reverse link after the reverse link resource assignments have been expired;

suspending monitoring of a forward link after the forward link resource assignments have been expired; and

performing the tune-away at time t1.

32. The computer-readable of claim 31, the instructions further comprising:

receiving an indication that the tune-away will be complete at time t2;

locating a frame boundary that occurs at a second point in time immediately after t2;

transmitting control information on the reverse link at the second point in time; and

monitoring the reverse link at the second point in time.

33. The computer-readable medium of claim 31, the instructions further comprising:

receiving a pilot signal during the tune-away;

generating a pilot signal report; and

communicating the pilot signal report to an access point.

34. A processor that executes instructions for allocating resources in a wireless communications environment, the instructions comprising:

upon receiving an indication that an access terminal will perform a tune-away, locating a frame boundary just prior to performance of the tune-away; and

expiring resource assignments associated with the access terminal at a time associated with the frame boundary.

35. The processor of claim 34, the instructions further comprising allocating resources associated with the access terminal to at least one disparate access terminal during the tune-away.

36. The processor of claim 35, the instructions further comprising re-allocating the resources associated with the access terminal to the access terminal upon completion of the tune-away.