Methods for radio link failure recovery, and user equipment

• US 8,848,641 B2
• Filed: 09/24/2010
• Issued: 09/30/2014
• Est. Priority Date: 09/25/2009
• Status: Active Grant

• Current Assignee: Blackberry Limited
• Original Assignee: Blackberry Limited
• Inventors: Fong, Mo-Han, Burbidge, Richard Charles, Cai, Zhijun, Suzuki, Takashi, Earnshaw, Andrew Mark, Heo, Youn Hyoung, Xu, Hua, Li, Jun, McBeath, Sean Michael
• Primary Examiner(s): Chery, Dady
• Application Number:
  US13/498,314
• Publication Number:
  US 20130051214A1
• Time in Patent Office: 1,467 Days
• Field of Search: 370/328, 370/329, 370/336, 370/345, 370/252, 455/73, 455/450, 455/509
• US Class Current: 370/329
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/00692 using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] allocation of physical resources in CoMP or in CA H04L5/0035
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 36/0088 Scheduling hand-off measurements
• CPC Class Codes: H04W 36/302 due to low signal strength
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: H04W 76/19 Connection re-establishment

Abstract

A system and method for radio link failure recovery is presented. A set of component carriers is identified. Each one of the set of component carriers includes a control channel monitored by a user equipment (UE). The control channel signals data channel assignment information for the UE. Radio link failure recovery is performed using monitoring of only a subset of the set of component carriers. In some cases, performing radio link failure recovery includes performing radio link failure detection, and detecting radio link failure by detecting an out-of-sync condition on a downlink physical layer, the out-of-sync condition occurring for a predetermined duration. In some cases, a number of component carriers in the subset of the set of component carriers is equal to 1.

Claims

1. A method for measurement reporting, comprising:

identifying at least one measurement criterion for at least one of a set of assigned component carriers, the at least one measurement criterion including at least one of;

a comparison of a signal quality of a first assigned component carrier with a first threshold,

a comparison of a signal quality of a neighboring cell with a second threshold, and

a comparison of the signal quality of the first assigned component carrier with the signal quality of the neighboring cell; and

upon detecting that the at least one criterion is satisfied, transmitting a measurement report

wherein a frequency of the neighboring cell is equal to a carrier frequency corresponding to a measurement object associated with the at least one criterion, and a frequency of the first assigned component carrier is equal to the carrier frequency corresponding to the measurement object associated with the at least one criterion or the first assigned component carrier is one of a list of assigned component carriers associated with the at least one criterion.

2. The method of claim 1, wherein the neighbor cell includes at least one of a non-serving cell, a non-assigned component carrier, and at least one of the component carriers in the set of assigned component carriers that is not the first assigned component carrier.

3. The method of claim 1, wherein the signal quality of at least one of the neighbor cell and the first assigned component carrier is determined by at least one of a reference signal received power (RSRP) and a reference signal received quality (RSRQ).

4. The method of claim 1, wherein the at least one criterion is satisfied when at least one of:

the signal quality of the first assigned component carrier is greater than the first threshold,

the signal quality of the first assigned component carrier is less than the first threshold,

the signal quality of the neighboring cell is better than the signal quality of the first assigned component carrier by a third threshold, and

the signal quality of the first assigned component carrier is less than the first threshold while the signal quality of the neighboring cell is better than the second threshold.

5. The method of claim 1, wherein a frequency of the first assigned component carrier is equal to a carrier frequency corresponding to a measurement object associated with the at least one criterion.

6. The method of claim 1, wherein a frequency of the neighboring cell is equal to a carrier frequency corresponding to a measurement object associated with the at least one criterion.

7. The method of claim 1, wherein, when the first assigned component carrier is one of a list of assigned component carriers associated with the at least one criterion, the list of assigned component carriers is of size one.

8. The method of claim 7, wherein the first assigned component carrier is an anchor carrier.

9. The method of claim 1, wherein, when the first assigned component carrier is one of a list of assigned component carriers associated with the at least one criterion, the list of assigned component carriers includes an anchor carrier.

10. The method of claim 1, wherein at least one carrier in the set of assigned component carriers comprises a cell.

11. A user equipment (UE), comprising:

one or more processors configured to;

identify at least one measurement criterion for at least one of a set of assigned component carriers, the at least one measurement criterion including at least one of;

a comparison of a signal quality of a first assigned component carrier with a first threshold,

a comparison of a signal quality of a neighboring cell with a second threshold, and

a comparison of the signal quality of the first assigned component carrier with the signal quality of the neighboring cell; and

upon detecting that the at least one criterion is satisfied, transmitting a measurement report

wherein a frequency of the neighboring cell is equal to a carrier frequency corresponding to a measurement object associated with the at least one criterion, and a frequency of the first assigned component carrier is equal to the carrier frequency corresponding to the measurement object associated with the at least one criterion or the first assigned component carrier is one of a list of assigned component carriers associated with the at least one criterion.

12. The UE of claim 11, wherein the neighbor cell includes at least one of a non-serving cell, a non-assigned component carrier, and at least one of the component carriers in the set of assigned component carriers that is not the first assigned component carrier.

13. The UE of claim 11, wherein the signal quality of at least one of the neighbor cell and the first assigned component carrier is determined by at least one of a reference signal received power (RSRP) and a reference signal received quality (RSRQ).

14. The UE of claim 11, wherein the at least one criterion is satisfied when at least one of:

the signal quality of the first assigned component carrier is greater than the first threshold,

the signal quality of the first assigned component carrier is less than the first threshold,

the signal quality of the neighboring cell is better than the signal quality of the first assigned component carrier by a third threshold, and

the signal quality of the first assigned component carrier is less than the first threshold while the signal quality of the neighboring cell is better than the second threshold.

15. The UE of claim 11, wherein a frequency of the first assigned component carrier is equal to a carrier frequency corresponding to a measurement object associated with the at least one criterion.

16. The UE of claim 11, wherein a frequency of the neighboring cell is equal to a carrier frequency corresponding to a measurement object associated with the at least one criterion.

17. The UE of claim 11, wherein, when the first assigned component carrier is one of a list of assigned component carriers associated with the at least one criterion, the list of assigned component carriers is of size one.

18. The UE of claim 17, wherein the first assigned component carrier is an anchor carrier.

19. The UE of claim 11, wherein, when the first assigned component carrier is one of a list of assigned component carriers associated with the at least one criterion, the list of assigned component carriers includes an anchor carrier.

20. The UE of claim 11, wherein at least one carrier in the set of assigned component carriers comprises a cell.

21. A non-transitory computer readable medium storing instructions to cause a processor to perform operations comprising:

identifying at least one measurement criterion for at least one of a set of assigned component carriers, the at least one measurement criterion including at least one of;

a comparison of a signal quality of a first assigned component carrier with a first threshold,

a comparison of a signal quality of a neighboring cell with a second threshold, and

a comparison of the signal quality of the first assigned component carrier with the signal quality of the neighboring cell; and

upon detecting that the at least one criterion is satisfied, transmitting a measurement report

wherein a frequency of the neighboring cell is equal to a carrier frequency corresponding to a measurement object associated with the at least one criterion, and a frequency of the first assigned component carrier is equal to the carrier frequency corresponding to the measurement object associated with the at least one criterion or the first assigned component carrier is one of a list of assigned component carriers associated with the at least one criterion.

22. The non-transitory computer readable medium of claim 21, wherein the neighbor cell includes at least one of a non-serving cell, a non-assigned component carrier, and at least one of the component carriers in the set of assigned component carriers that is not the first assigned component carrier.

23. The non-transitory computer readable medium of claim 21, wherein the signal quality of at least one of the neighbor cell and the first assigned component carrier is determined by at least one of a reference signal received power (RSRP) and a reference signal received quality (RSRQ).

24. The non-transitory computer readable medium of claim 21, wherein the at least one criterion is satisfied when at least one of:

the signal quality of the first assigned component carrier is greater than the first threshold,

the signal quality of the first assigned component carrier is less than the first threshold,

the signal quality of the neighboring cell is better than the signal quality of the first assigned component carrier by a third threshold, and

the signal quality of the first assigned component carrier is less than the first threshold while the signal quality of the neighboring cell is better than the second threshold.

25. The non-transitory computer readable medium of claim 21, wherein a frequency of the first assigned component carrier is equal to a carrier frequency corresponding to a measurement object associated with the at least one criterion.

26. The non-transitory computer readable medium of claim 21, wherein a frequency of the neighboring cell is equal to a carrier frequency corresponding to a measurement object associated with the at least one criterion.

27. The non-transitory computer readable medium of claim 21, wherein, when the first assigned component carrier is one of a list of assigned component carriers associated with the at least one criterion, the list of assigned component carriers is of size one.

28. The non-transitory computer readable medium of claim 27, wherein the first assigned component carrier is an anchor carrier.

29. The non-transitory computer readable medium of claim 21, wherein, when the first assigned component carrier is one of a list of assigned component carriers associated with the at least one criterion, the list of assigned component carriers includes an anchor carrier.

30. The non-transitory computer readable medium of claim 21, wherein at least one carrier in the set of assigned component carriers comprises a cell.