HANDOVER FAILURE PROCEDURES IN COMMUNICATION SYSTEMS

• US 20090149180A1
• Filed: 12/04/2008
• Published: 06/11/2009
• Est. Priority Date: 12/05/2007
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Kitazoe, Masato
• Granted Patent: US 9,544,828 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 36/26 by agreed or negotiated communication parameters

Abstract

When a handover failure occurs and/or is anticipated to occur, an optimized cell can be selected and user equipment can transfer to the optimized cell. This optimized cell can differ from a previous cell based upon various factors such as anticipated interference and load balancing. Once there is identification of a handover failure a cell can return to a previous frequency and an appropriate cell can be determined. Instruction of the cell that should be used can be determined by user equipment as well as from a network entity.

Claims

1. A method for managing a wireless communication handover operable upon a wireless communication device, comprising:

identifying a handover failure in relation to user equipment transferring among base stations; and

selecting an optimized cell upon which to apply to the user equipment when the handover failure is identified.

2. The method of claim 1, selection of the optimized cell includes selecting a cell anticipated to have a lowest amount of interference for the user equipment or selecting a cell as a function of load balancing among at least two cells.

3. The method of claim 1, selecting the optimized cell occurs through intelligent selection such that at least one cell characteristic is evaluated and a result of the evaluation is used to select the cell.

4. The method of claim 1, further comprising reverting operation to a previous frequency, the user equipment changes frequency upon attempting the handover.

5. An apparatus, comprising:

an identifier that identifies a handover failure in relation to user equipment transferring among base stations; and

a designator that selects an optimized cell upon which to apply to the user equipment when the handover failure is identified.

6. The apparatus of claim 5, selection of the optimized cell includes selection of a cell anticipated to have a lowest amount of interference for the user equipment or selection of a cell as a function of load balancing among at least two cells.

7. The apparatus of claim 5, optimized cell selection occurs through intelligent selection such that at least one cell characteristic is evaluated by an analyzer and a result of the evaluation is used to select the cell.

8. The apparatus of claim 5, further comprising a changer that reverts operation to a previous frequency, the user equipment changes frequency upon attempting the handover.

9. An apparatus, comprising:

means for identifying a handover failure in relation to user equipment transferring among base stations; and

means for selecting an optimized cell upon which to apply to the user equipment when the handover failure is identified.

10. The apparatus of claim 9, selection of the optimized cell includes selecting a cell anticipated to have a lowest amount of interference for the user equipment or selecting a cell as a function of load balancing among at least two cells.

11. The apparatus of claim 9, means for selecting the optimized cell operates through intelligent selection such that at least one cell characteristic is evaluated by a means for analyzing and a result of the evaluation is used to select the cell.

12. The apparatus of claim 9, further comprising means for reverting operation to a previous frequency, the user equipment changes frequency upon attempting the handover.

13. A computer program product, comprising:

a computer-readable medium comprising;

a set of codes for identifying a handover failure in relation to user equipment transferring among base stations; and

a set of codes for selecting an optimized cell upon which to apply to the user equipment when the handover failure is identified.

14. The a computer-readable medium of claim 13, selection of the optimized cell includes selecting a cell anticipated to have a lowest amount of interference for the user equipment or selecting a cell as a function of load balancing among at least two cells.

15. The a computer-readable medium of claim 13, the set of codes for selecting the optimized cell operate through intelligent selection such that at least one cell characteristic is evaluated by a set o codes for analyzing and a result of the evaluation is used to select the cell.

16. The a computer-readable medium of claim 13, further comprising a set of codes for reverting operation to a previous frequency, the user equipment changes frequency upon attempting the handover.

17. At least one processor configured to manage a wireless communication handover, comprising

a module for identifying a handover failure in relation to user equipment transferring among base stations;

and

a module for selecting an optimized cell upon which to apply to the user equipment when the handover failure is identified.

18. The processor of claim 17, selection of the optimized cell includes selecting a cell anticipated to have a lowest amount of interference for the user equipment or selecting a cell as a function of load balancing among at least two cells.

19. The processor of claim 17, the module for selecting the optimized cell operates through intelligent selection such that at least one cell characteristic is evaluated by a module for analyzing and a result of the evaluation is used to select the cell.

20. The processor of claim 17, further comprising a module for reverting operation to a previous frequency, the user equipment changes frequency upon attempting the handover.

21. A method for managing operation of user equipment operable upon a wireless communication device, comprising:

anticipating a handover failure for user equipment; and

instructing the user equipment on how to operate based upon the anticipated handover failure.

22. The method of claim 21, instructing the user equipment comprises instructing the user equipment to transfer to a particular cell.

23. The method of claim 22, further comprising intelligently selecting the particular cell upon which the user equipment should return, selection is performed in an optimized manner.

24. The method of claim 21, instructing the user equipment comprises instructing the user equipment to revert to a frequency of a previous serving cell.

25. The method of claim 21, instructing the user equipment comprises transferring a flag to the user equipment.

26. The method of claim 25, transferring the flag is performed through a dedicated signaling or through a system information broadcast.

27. An apparatus, comprising:

a predictor that anticipates a handover failure for user equipment; and

a transmitter that instructs the user equipment on how to operate based upon the anticipated handover failure.

28. The apparatus of claim 27, the transmitter comprises an assignor that instructs the user equipment to transfer to a particular cell.

29. The apparatus of claim 28, further comprising a designator that intelligently selects the particular cell upon which the user equipment should return, selection is performed in an optimized manner.

30. The apparatus of claim 27, the transmitter comprises a returner that instructs the user equipment to revert to a frequency of a previous serving cell.

31. The apparatus of claim 27, the transmitter comprises a flagger that transfers a flag to the user equipment.

32. The apparatus of claim 31, the flag is transferred through a dedicated signaling or through a system information broadcast.

33. An apparatus, comprising:

means for anticipating a handover failure for user equipment; and

means for instructing the user equipment on how to operate based upon the anticipated handover failure.

34. The apparatus of claim 33, means for instructing the user equipment comprises means for instructing the user equipment to transfer to a particular cell.

35. The apparatus of claim 34, further comprising means for intelligently selecting the particular cell upon which the user equipment should return, selection occurs in an optimized manner.

36. The apparatus of claim 33, means for instructing the user equipment comprises means for instructing the user equipment to revert to a frequency of a previous serving cell.

37. The apparatus of claim 33, means for instructing the user equipment comprises means for transferring a flag to the user equipment.

38. The apparatus of claim 37, means for transferring the flag operates through a dedicated signaling or through a system information broadcast.

39. A computer program product, comprising:

a computer-readable medium comprising;

a set of codes for anticipating a handover failure for user equipment; and

a set of codes for instructing the user equipment on how to operate based upon the anticipated handover failure.

40. The method of claim 39, the set of codes for instructing the user equipment comprises a set of codes for instructing the user equipment to transfer to a particular cell.

41. The method of claim 40, further comprising a set of codes for intelligently selecting the particular cell upon which the user equipment should return, selection occurs in an optimized manner.

42. The method of claim 39, the set of codes for instructing the user equipment comprises a set of codes for instructing the user equipment to revert to a frequency of a previous serving cell.

43. The method of claim 39, the set of codes for instructing the user equipment comprises a set of codes for transferring a flag to the user equipment.

44. The method of claim 43, the set of codes for transferring the flag operates through a dedicated signaling or through a system information broadcast.

45. At least one processor configured to manage operation of user equipment, comprising:

a module for anticipating a handover failure for user equipment; and

a module for instructing the user equipment on how to operate based upon the anticipated handover failure.

46. The method of claim 45, the module for instructing the user equipment comprises a module for instructing the user equipment to transfer to a particular cell.

47. The method of claim 46, further comprising a module for intelligently selecting the particular cell upon which the user equipment should return, selection occurs in an optimized manner.

48. The method of claim 45, the module for instructing the user equipment comprises a module for instructing the user equipment to revert to a frequency of a previous serving cell.

49. The method of claim 45, the module for instructing the user equipment comprises a module for transferring a flag to the user equipment.

50. The method of claim 49, the module for transferring the flag is performed through a dedicated signaling or through a system information broadcast.