MOBILITY MANAGEMENT BASED ON RADIO LINK FAILURE REPORTING

• US 20100124918A1
• Filed: 11/13/2009
• Published: 05/20/2010
• Est. Priority Date: 11/17/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Agashe, Parag A., Tenny, Nathan E.
• Granted Patent: US 9,271,204 B2
• Time in Patent Office: Days
• US Class Current: 455/423
• CPC Class Codes: H04W 36/0079 in case of hand-off failure or rejection
• 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 76/18 Management of setup rejection or failure

Abstract

A communication node determines that radio link failure occurred during connected state mobility of an access terminal and reports the radio link failure to another communication node. For example, a target access point may determine that radio link failure occurred during handover of an access terminal and send a radio link failure report message to the access point that was previously serving the access terminal or to some other node (e.g., a network node). In the first case, the serving access point may adjust mobility parameters based on this radio link failure information and, optionally, other reported radio link failure information. In the second case, the other node may send a radio link failure report message to the serving access point, or the other node may adjust mobility parameters based on this radio link failure information (and, optionally, other reported radio link failure information) and send the adjusted mobility parameters to the serving access point.

Claims

1. A method of communication, comprising:

receiving a message at an access point, wherein the message indicates that radio link failure occurred during handover of at least one access terminal; and

adapting at least one mobility parameter based on the received message.

2. The method of claim 1, wherein the message is received from a target access point for the handover.

3. The method of claim 1, wherein the message is received from a network management node.

4. The method of claim 3, wherein the network management node comprises an operations and maintenance entity of a cellular network.

5. The method of claim 1, further comprising maintaining a record of the radio link failure and other radio link failures, wherein the adaptation of the at least one mobility parameter is based on the record.

6. The method of claim 1, wherein:

the message comprises statistical information relating to handovers at least one other access point; and

the adaptation of the at least one mobility parameter is based on the statistical information.

7. The method of claim 1, wherein the message indicates whether a target access point for the handover was prepared for the handover.

8. The method of claim 1, wherein the message comprises a context fetch from a target access point that was not prepared for the handover.

9. The method of claim 1, wherein the at least one mobility parameter comprises a measurement reporting parameter that specifies how access terminals are to determine at least one of the group consisting of:

whether to conduct a target measurement, whether to report a target measurement, and when to report a target measurement.

10. The method of claim 1, wherein the at least one mobility parameter comprises a handover parameter that the access point uses to determine at least one of the group consisting of:

whether to perform a handover, when to perform a handover, and a target access point.

11. An apparatus for communication, comprising:

a communication controller configured to receive a message at an access point, wherein the message indicates that radio link failure occurred during handover of at least one access terminal; and

a mobility controller configured to adapt at least one mobility parameter based on the received message.

12. The apparatus of claim 11, wherein the message is received from a target access point for the handover.

13. The apparatus of claim 11, wherein the message is received from a network management node.

14. The apparatus of claim 11, wherein:

the mobility controller is further configured to maintain a record of the radio link failure and other radio link failures; and

the adaptation of the at least one mobility parameter is based on the record.

15. The apparatus of claim 11, wherein:

the message comprises statistical information relating to handovers at least one other access point; and

the adaptation of the at least one mobility parameter is based on the statistical information.

16. An apparatus for communication, comprising:

means for receiving a message at an access point, wherein the message indicates that radio link failure occurred during handover of at least one access terminal; and

means for adapting at least one mobility parameter based on the received message.

17. The apparatus of claim 16, wherein the message is received from a target access point for the handover.

18. The apparatus of claim 16, wherein the message is received from a network management node.

19. The apparatus of claim 16, further comprising means for maintaining a record of the radio link failure and other radio link failures, wherein the adaptation of the at least one mobility parameter is based on the record.

20. The apparatus of claim 16, wherein:

the message comprises statistical information relating to handovers at least one other access point; and

the adaptation of the at least one mobility parameter is based on the statistical information.

21. A computer-program product, comprising:

computer-readable medium comprising code for causing a computer to;

receive a message at an access point, wherein the message indicates that radio link failure occurred during handover of at least one access terminal; and

adapt at least one mobility parameter based on the received message.

22. The computer-program product of claim 21, wherein the message is received from a target access point for the handover.

23. The computer-program product of claim 21, wherein the message is received from a network management node.

24. The computer-program product of claim 21, wherein:

the computer-readable medium further comprises code for causing the computer to maintain a record of the radio link failure and other radio link failures; and

the adaptation of the at least one mobility parameter is based on the record.

25. The computer-program product of claim 21, wherein:

the message comprises statistical information relating to handovers at least one other access point; and

the adaptation of the at least one mobility parameter is based on the statistical information.

26. A method of communication, comprising:

receiving a first message from a first access point, wherein the message indicates that radio link failure occurred during handover of at least one access terminal to the first access point; and

sending a second message to a second access point based on the receipt of the first message from the first access point.

27. The method of claim 26, wherein the second message indicates that the radio link failure occurred during handover of the at least one access terminal to the first access point.

28. The method of claim 26, further comprising maintaining statistical information relating to the radio link failure and other radio link failures, wherein the second message comprises the statistical information.

29. The method of claim 26, further comprising adapting at least one mobility parameter based on the first message, wherein the second message comprises the at least one mobility parameter.

30. The method of claim 29, wherein the at least one mobility parameter comprises a measurement reporting parameter that specifies how access terminals are to determine at least one of the group consisting of:

whether to conduct a target measurement, whether to report a target measurement, and when to report a target measurement.

31. The method of claim 29, wherein the at least one mobility parameter comprises a handover parameter that the second access point uses to determine at least one of the group consisting of:

whether to perform a handover, when to perform a handover, and a target access point.

32. The method of claim 29, wherein the at least one mobility parameter comprises a handover performance target for the second access point.

33. The method of claim 26, wherein the first message indicates whether the first access point was prepared for the handover.

34. The method of claim 26, wherein the first message comprises statistical information relating to handovers at the first access point.

35. The method of claim 34, further comprising adapting at least one mobility parameter based on the statistical information, wherein the second message comprises the at least one mobility parameter.

36. An apparatus for communication, comprising:

a communication controller configured to receive a first message from a first access point, wherein the message indicates that radio link failure occurred during handover of at least one access terminal to the first access point; and

a mobility controller configured to send a second message to a second access point based on the receipt of the first message from the first access point.

37. The apparatus of claim 36, wherein the second message indicates that the radio link failure occurred during handover of the at least one access terminal to the first access point.

38. The apparatus of claim 36, wherein:

the mobility controller is further configured to maintain statistical information relating to the radio link failure and other radio link failures; and

the second message comprises the statistical information.

39. The apparatus of claim 36, wherein:

the mobility controller is further configured to adapt at least one mobility parameter based on the first message; and

the second message comprises the at least one mobility parameter.

40. An apparatus for communication, comprising:

means for receiving a first message from a first access point, wherein the message indicates that radio link failure occurred during handover of at least one access terminal to the first access point; and

means for sending a second message to a second access point based on the receipt of the first message from the first access point.

41. The apparatus of claim 40, wherein the second message indicates that the radio link failure occurred during handover of the at least one access terminal to the first access point.

42. The apparatus of claim 40, further comprising means for maintaining statistical information relating to the radio link failure and other radio link failures, wherein the second message comprises the statistical information.

43. The apparatus of claim 40, further comprising means for adapting at least one mobility parameter based on the first message, wherein the second message comprises the at least one mobility parameter.

44. A computer-program product, comprising:

computer-readable medium comprising code for causing a computer to;

receive a first message from a first access point, wherein the message indicates that radio link failure occurred during handover of at least one access terminal to the first access point; and

send a second message to a second access point based on the receipt of the first message from the first access point.

45. The computer-program product of claim 44, wherein the second message indicates that the radio link failure occurred during handover of the at least one access terminal to the first access point.

46. The computer-program product of claim 44, wherein:

the computer-readable medium further comprises code for causing the computer to maintain statistical information relating to the radio link failure and other radio link failures; and

the second message comprises the statistical information.

47. The computer-program product of claim 44, wherein:

the computer-readable medium further comprises code for causing the computer to adapt at least one mobility parameter based on the first message; and

the second message comprises the at least one mobility parameter.