Method of handling radio link failure detection in a wireless communication system and related communication device

• US 8,700,029 B2
• Filed: 01/21/2010
• Issued: 04/15/2014
• Est. Priority Date: 03/22/2009
• Status: Active Grant

• Current Assignee: HTC Corporation
• Original Assignee: HTC Corporation
• Inventors: Wu, Chih-Hsiang
• Primary Examiner(s): RAMPURIA, SHARAD K
• Application Number:
  US12/690,930
• Publication Number:
  US 20100240357A1
• Time in Patent Office: 1,545 Days
• Field of Search: 455423-425, 455 6711- 6716, 455/435.2, 455/574, 370/331
• US Class Current: 455/425
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements

Abstract

A method of handling radio link failure detection for a communication device of a wireless communication system includes performing radio problem detection for a plurality of targets of interest, and managing at least a timer for detecting radio link failure of the plurality of targets of interest.

Claims

1. A method of handling radio link failure detection for a communication device of a wireless communication system, the method comprising:

connecting to a plurality of cells with the same component carrier or with a plurality of component carriers;

performing radio problem detection for the plurality of component carriers or cells comprising generating a plurality of consecutive out-of-synchronization indications when the radio problems are detected on the plurality of component carriers or cells; and

starting a timer for detecting radio link failure of the plurality of component carriers or cells when radio problems are detected on all of the plurality of component carriers or cells.

2. The method of claim 1, wherein starting the timer for detecting the radio link failure of the plurality of component carriers or cells when radio problems are detected on the plurality of component carriers or cells comprises starting the timer for detecting the radio link failure of the plurality of component carriers or cells according to the plurality of consecutive out-of-synchronization indications.

3. The method of claim 1 further comprising determining the radio link failure of the plurality of component carriers or cells to be detected when the timer expires.

4. The method of claim 3 further comprising performing a radio resource control (RRC) connection re-establishment procedure for re-establishing at least a radio link of the plurality of component carriers or cells.

5. The method of claim 1 further comprising:

generating a plurality of consecutive in-synchronization indications when one of the radio problems is recovered; and

stopping the timer according to the plurality of consecutive in-synchronization indications.

6. A method of handling radio link failure detection for a communication device of a wireless communication system, the method comprising:

connecting to a plurality of cells with the same component carrier or with a plurality of component carriers;

performing radio problem detection for the plurality of component carriers or cells comprising generating a plurality of consecutive out-of-synchronization indications when the radio problem is detected on the component carriers or cells; and

starting a timer for detecting radio link failure of one of the plurality of component carriers or cells when a radio problem is detected on the component carriers or cells.

7. The method of claim 6, wherein starting the timer for detecting the radio link failure of the component carriers or cells when the radio problem is detected on the component carriers or cells comprises starting the timer for detecting the radio link failure of the component carriers or cells according to the plurality of consecutive out-of-synchronization indications.

8. The method of claim 6 further comprising determining the radio link failure of the component carriers or cells to be detected when the timer expires.

9. The method of claim 8 further comprising performing a radio resource control (RRC) connection re-establishment procedure or a random access procedure for re-establishing a radio link of the component carriers or cells.

10. The method of claim 6 further comprising:

generating a plurality of consecutive in-synchronization indications when the radio problem is recovered; and

stopping the timer according to the plurality of consecutive in-synchronization indications.

11. A method of handling radio link failure detection for a communication device of a wireless communication system, the method comprising:

connecting to a plurality of cells with the same component carrier or with a plurality of component carriers;

performing radio problem detection for the plurality of component carriers or cells comprising generating a first number of consecutive out-of-synchronization indications when the radio problem is detected on the first component carrier or cell;

starting a first timer for detecting radio link failure of a first component carrier or cell of the plurality of component carriers or cells when a radio problem is detected on the first component carrier or cell; and

starting a second timer for detecting radio link failure of the rest of the plurality of component carriers or cells when radio problems are detected on the rest of the plurality of component carriers or cells.

12. The method of claim 11, wherein performing the radio problem detection for the plurality of component carriers or cells further comprises:

generating a second number of consecutive out-of-synchronization indications when the radio problems are detected on the rest of the plurality of component carriers or cells.

13. The method of claim 12, wherein starting the first timer for detecting the radio link failure of the first component carrier or cell of the plurality of component carriers or cells when the radio problem is detected on the first component carrier or cell comprises starting the first timer according to the first number of consecutive out of synchronization indications;

and starting the second timer for detecting radio link failure of the rest of the plurality of component carriers or cells when radio problems are detected on the rest of the plurality of component carriers or cells comprises starting the second timer according to the second number of consecutive out of synchronization indications.

14. The method of claim 11 further comprising:

determining the radio link failure of the first component carrier or cell to be detected when the first timer expires; and

determining the radio link failure of the rest of the plurality of component carriers or cells to be detected when the second timer expires.

15. The method of claim 14 further comprising performing a radio resource control (RRC) connection re-establishment procedure or a random access procedure for re-establishing a radio link of the first component carrier or cell or for re-establishing at least a radio link of the rest of the component carriers or cells.

16. The method of claim 12 further comprising:

generating a third number of consecutive in-synchronization indications when the radio problem of the first component carrier or cell is recovered before the first timer expires;

generating a fourth number of consecutive in-synchronization indications when one of the radio problems of the rest of the component carriers or cells is recovered before the second timer expires;

stopping the first timer according to the first number of consecutive in-synchronization indications; and

stopping the second timer according to the second number of consecutive in-synchronization indications.

17. A communication device of accurately handling radio link failure detection for a wireless communication system, the communication device comprising:

a connecting unit for connecting to a plurality of cells with the same component carrier or with a plurality of component carriers;

a detecting unit for performing radio problem detection for the plurality of component carriers or cells and generating an indication signal comprising a plurality of consecutive out-of-synchronization indications when radio problems are detected on the plurality of component carriers or cells; and

a management unit, coupled to the detecting unit, for starting a timer for detecting radio link failure of the plurality of component carriers or cells according to the indication signal.

18. The communication device of claim 17, wherein the management unit determines the radio link failure of the plurality of component carriers or cells to be detected when the timer expires, and generates a control signal.

19. The communication device of claim 18 further comprising a radio link establishment unit for performing a radio resource control (RRC) connection re-establishment procedure for re-establishing at least a radio link of the plurality of component carriers or cells according to the control signal.

20. The communication device of claim 17, wherein the detecting unit further generates a plurality of consecutive in-synchronization indications when one of the radio problems detected on the plurality of component carriers or cells is recovered.

21. The communication device of claim 20, wherein the management unit stops the timer according to the plurality of consecutive in-synchronization indications.

22. A communication device of accurately handling radio link failure detection for a wireless communication system, the communication device comprising:

a connecting unit for connecting to a plurality of cells with the same component carrier or with a plurality of component carriers;

a plurality detecting unit for performing radio problem detection for the plurality of component carriers or cells and generating an indication comprising a plurality of consecutive out-of-synchronization indications signal when a radio problem is detected on one of the plurality of component carriers or cells; and

a plurality of management units corresponding to the plurality of component carriers or cells, for managing timers for detecting radio link failure of the plurality of component carriers or cells;

wherein a first management unit corresponding to the component carrier or cell having the radio problem starts a timer according to the indication signal.

23. The communication device of claim 22, wherein the first management unit determines the radio link failure of the component carrier or cell to be detected when the timer expires, and generates a control signal.

24. The communication device of claim 23 further comprising a radio link establishment unit for performing a radio resource control (RRC) connection re-establishment procedure or a random access procedure for re-establishing a radio link of the component carrier or cell according to the control signal.

25. The communication device of claim 22, wherein the detecting unit further generates a plurality of consecutive in-synchronization indications when the radio problem detected on the component carrier or cell is.

26. The communication device of claim 25, wherein the first management unit stops the timer according to the plurality of consecutive in-synchronization indications.

27. A communication device of accurately handling radio link failure detection for a wireless communication system, the communication device comprising:

a connecting unit for connecting to a plurality of cells with the same component carrier or with a plurality of component carriers;

a detecting unit for performing radio problem detection for the plurality of component carriers or cells, generating a first indication signal when a radio problem of the first component carrier or cell is detected, and generating a second indication signal when radio problems of the rest of the plurality of component carriers or cells are detected, wherein the first indication signal comprises a first number of consecutive out-of-synchronization indications;

a first management unit for starting a first timer for detecting radio link failure of the first component carrier or cell according to the first indication signal; and

a second management unit for starting a second timer for detecting radio link failure of the rest of the plurality of component carriers or cells according to the second indication signal.

28. The communication device of claim 27, wherein the second indication signal comprises a second number of consecutive out-of-synchronization indications.

29. The communication device of claim 27, wherein the first management unit determines the radio link failure of the first component carrier or cell to be detected when the first timer expires, and generates a first control signal, and the second management unit determines the radio link failure of the rest of the plurality component carriers or cells to be detected when the second timer expires, and generates a second control signal.

30. The communication device of claim 29 further comprising a radio link establishment unit for performing a radio resource control (RRC) connection re-establishment procedure or a random access procedure for re-establishing a radio link of the first component carrier or cell according to the first control signal, or for re-establishing at least a radio link of the rest of the component carriers or cells according to the second control signal when access stratum (AS) security is activated.

31. The communication device of claim 28, wherein the detecting unit further generates a third number of consecutive in-synchronization indications when the radio problem detected on the first component carrier or cell is recovered before the first timer expires, and generates a fourth number of consecutive in-synchronization indications when one of the radio problems detected on the rest of the plurality of component carriers or cells is recovered before the second timer expires.

32. The communication device of claim 31, wherein the first management unit stops the first timer according to the third number of consecutive in-synchronization indications, and the second management unit stops the second timer according to the fourth number of consecutive in-synchronization indications.

33. A communication device of accurately handling radio link failure detection for a wireless communication system, the communication device comprising:

a computer readable recording medium for storing program code corresponding to a process; and

a processor coupled to the computer readable recording medium, for processing the program code to execute the process;

wherein the process comprises;

connecting to a plurality of cells with the same component carrier or with a plurality of component carriers;

performing radio problem detection for the plurality of component carriers or cells comprising generating a plurality of consecutive out-of-synchronization indications when the radio problems are detected on the plurality of component carriers or cells; and

starting a timer for detecting radio link failure of the plurality of component carriers or cells when radio problems are detected on the plurality of component carriers or cells.

34. The communication device of claim 33, wherein starting the timer for detecting the radio link failure of the plurality of component carriers or cells when the radio problems are detected on the plurality of component carriers or cells comprises starting the timer according to the plurality of consecutive out-of-synchronization indications.

35. The communication device of claim 33, wherein the process further comprises determining the radio link failure of the plurality of component carriers or cells to be detected when the timer expires.

36. The communication device of claim 35, wherein the process further comprises performing a radio resource control (RRC) connection re-establishment procedure for re-establishing at least a radio link of the plurality of component carriers or cells.

37. The communication device of claim 33 further comprising:

generating a plurality of consecutive in-synchronization indications when one of the radio problems is recovered; and

stopping the timer according to the plurality of consecutive in-synchronization indications.

38. A communication device of accurately handling radio link failure detection for a wireless communication system, the communication device comprising:

a computer readable recording medium for storing program code corresponding to a process; and

a processor coupled to the computer readable recording medium, for processing the program code to execute the process;

wherein the process comprises;

connecting to a plurality of cells with the same component carrier or with a plurality of component carriers;

performing radio problem detection for the plurality of component carriers or cells comprising generating a plurality of consecutive out-of-synchronization indications when the radio problem is detected on the component carrier or cell; and

starting a timer for detecting radio link failure of one of the plurality of component carriers or cells when a radio problem is detected on the component carriers or cells.

39. The communication device of claim 38, wherein starting the timer for detecting the radio link failure of the component carrier or cell when the radio problem is detected on the component carrier or cell comprises starting the timer according to the plurality of consecutive out-of-synchronization indications.

40. The communication device of claim 38, wherein the process further comprises determining the radio link failure of the component carrier or cell to be detected when the timer expires.

41. The communication device of claim 40, wherein the process further comprises performing a radio resource control (RRC) connection re-establishment procedure or a random access procedure for re-establishing a radio link of the component carrier or cell.

42. The communication device of claim 38 further comprising:

generating a plurality of consecutive in-synchronization indications when the radio problem is recovered; and

stopping the timer according to the plurality of consecutive in-synchronization indications.

43. A communication device of accurately handling radio link failure detection for a wireless communication system, the communication device comprising:

a computer readable recording medium for storing program code corresponding to a process; and

a processor coupled to the computer readable recording medium, for processing the program code to execute the process;

wherein the process comprises;

connecting to a plurality of cells with the same component carrier or with a plurality of component carriers;

performing radio problem detection for the plurality of component carriers or cells comprising generating a first number of consecutive out-of-synchronization indications when the radio problem is detected on the first component carrier or cell;

starting a first timer for detecting radio link failure of a first component carrier or cell of the plurality of component carriers or cells when a radio problem is detected on the first component carrier or cell; and

starting a second timer for detecting radio link failure of the rest of the plurality of component carriers or cells when radio problems are detected on the rest of the plurality of the component carriers or cells.

44. The communication device of claim 43, wherein performing the radio problem detection for the plurality of component carriers or cells further comprises generating a second number of consecutive out-of-synchronization indications when the radio problems are detected on the rest of the plurality of component carriers or cells.

45. The communication device of claim 44, wherein starting the first timer for detecting the radio link failure of the first component carrier or cell of the plurality of component carriers or cells when the radio problem is detected on the first component carrier or cell comprises starting the first timer according to the first number of consecutive out-of-synchronization indications;

and starting the second timer for detecting the radio link failure of the rest of the plurality of component carriers or cells when the radio problems are detected on the rest of the plurality of component carriers or cells comprises starting the second timer according to the second number of consecutive out of synchronization indications.

46. The communication device of claim 43, wherein the process further comprises determining the radio link failure of the first component carrier or cell to be detected when the first timers expires, and determining the radio link failure of the rest of the plurality of component carriers or cells to be detected when the second timers expires.

47. The communication device of claim 46, wherein the process further comprises performing a radio resource control (RRC) connection re-establishment procedure or a random access procedure for re-establishing a radio link of the first component carrier or cell or for re-establishing at least a radio link of the rest of the component carriers or cells.

48. The communication device of claim 44 further comprising:

generating a third number of consecutive in-synchronization indications when the radio problem is recovered before the first timer expires;

generating a fourth number of consecutive in-synchronization indications when one of the radio problems is recovered before the second timer expires;

stopping the first timer according to the third number of consecutive in-synchronization indications; and

stopping the second timer according to the fourth number of consecutive in-synchronization indications.