BEAM FAILURE RECOVERY IN CONNECTION WITH SWITCHING BWP

• US 20190319833A1
• Filed: 03/08/2019
• Published: 10/17/2019
• Est. Priority Date: 04/14/2018
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: NAGARAJA, Sumeeth, ZHOU, Yan, LUO, Tao, MANOLAKOS, Alexandros, MONTOJO, Juan
• Granted Patent: US 10,841,149 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04L 41/0668 by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
• CPC Class Codes: H04L 41/0677 Localisation of faults
• CPC Class Codes: H04L 43/0823 Errors, e.g. transmission errors
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 28/20 Negotiating bandwidth
• CPC Class Codes: H04W 36/0079 in case of hand-off failure or rejection
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 72/046 the resource being in the space domain, e.g. beams
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

A method, a computer-readable medium, and an apparatus are provided for wireless communication at a UE. The apparatus switches from a first, active BWP to a second, active BWP. Then, the apparatus measures a first radio link quality of a configured CORESET TCI or a beam failure detection RS upon switching to the second, active BWP. For example, the apparatus may switch the active BWP based on detecting an expiration of a BWP inactivity timer. The apparatus may then determine based on a threshold radio link quality whether to perform a measurement of a second radio link quality of a beam failure recovery candidate resource set or to continue to monitor the configured CORESET TCI in the second, active BWP.

Claims

1. A method of wireless communication at a User Equipment (UE), the method comprising:

switching from a first, active Bandwidth Part (BWP) to a second, active BWP;

measuring a first radio link quality of a configured Control-resource set (CORESET) Transmission Configuration Indicator (TCI) or a beam failure detection Reference Signal (RS) upon switching to the second, active BWP; and

determining based on a threshold radio link quality whether to perform a measurement of a second radio link quality of a beam failure recovery candidate resource set or to continue to monitor the configured CORESET TCI in the second, active BWP.

2. The method of claim 1, further comprising:

detecting an expiration of a BWP inactivity timer, wherein the UE switches from the first, active BWP to the second, active BWP in response to the detecting the expiration of the BWP inactivity timer.

3. The method of claim 1, wherein the UE continues to monitor the configured CORESET TCI in the second, active BWP when the first radio link quality of the configured CORESET TCI or the beam failure detection RS meets the threshold radio link quality.

4. The method of claim 1, wherein the UE performs the measurement of the second radio link quality of the beam failure recovery candidate resource set when the first radio link quality of the configured CORESET TCI or the beam failure detection RS does not meet the threshold radio link quality.

5. The method of claim 4, wherein the UE determines whether to perform a contention free random access procedure on a candidate beam or a contention based random access procedure on the candidate beam based on whether the measurement of the second radio link quality of the beam failure recovery candidate resource set meets a second threshold.

6. The method of claim 5, wherein the second threshold is configured by a network.

7. The method of claim 5, wherein the UE performs the contention free random access procedure on the candidate beam when the second radio link quality meets the second threshold.

8. The method of claim 5, wherein the UE performs the contention based random access procedure on the candidate beam when the second radio link quality does not meet the second threshold.

9. The method of claim 1, further comprising:

receiving a configuration of at least one value for transmission of a beam failure recovery signal or for transmission of another signal indicating a change of a preferred link to a base station.

10. The method of claim 1, further comprising:

changing at least one of a timer or a number of requests in a beam failure detection based on the switching to the second, active BWP.

11. The method of claim 10, wherein the changing the at least one of the timer or the number of requests comprises reducing or disabling metrics relating to the at least one of the timer or the number of requests.

12. An apparatus for wireless communication at a User Equipment (UE), comprising:

means for switching from a first, active Bandwidth Part (BWP) to a second, active BWP;

means for measuring a first radio link quality of a configured Control-resource set (CORESET) Transmission Configuration Indicator (TCI) or a beam failure detection Reference Signal (RS) upon switching to the second, active BWP; and

means for determining based on a threshold radio link quality whether to perform a measurement of a second radio link quality of a beam failure recovery candidate resource set or to continue to monitor the configured CORESET TCI in the second, active BWP.

13. The apparatus of claim 12, further comprising:

means for detecting an expiration of a BWP inactivity timer, wherein the UE switches from the first, active BWP to the second, active BWP in response to the detecting the expiration of the BWP inactivity timer.

14. The apparatus of claim 12, wherein the means for measuring further perform the measurement of the second radio link quality of the beam failure recovery candidate resource set when the first radio link quality of the configured CORESET TCI or the beam failure detection RS does not meet the threshold radio link quality, the apparatus further comprising:

means for determining whether to perform a contention free random access procedure on a candidate beam or a contention based random access procedure on the candidate beam based on whether the measurement of the second radio link quality of the beam failure recovery candidate resource set meets a second threshold;

means for performing the contention free random access procedure on the candidate beam when the second radio link quality meets the second threshold; and

means for performing the contention based random access procedure on the candidate beam when the second radio link quality does not meet the second threshold.

15. The apparatus of claim 12, further comprising:

means for receiving a configuration of at least one value for transmission of a beam failure recovery signal.

16. The apparatus of claim 12, further comprising:

means for reducing at least one of a timer or a number of requests in a beam failure detection based on the switching to the second, active BWP.

17. An apparatus for wireless communication at a User Equipment (UE), comprising:

a memory; and

at least one processor coupled to the memory and configured to;

switch from a first, active Bandwidth Part (BWP) to a second, active BWP;

measure a first radio link quality of a configured Control-resource set (CORESET) Transmission Configuration Indicator (TCI) or a beam failure detection Reference Signal (RS) upon switching to the second, active BWP; and

determine based on a threshold radio link quality whether to perform a measurement of a second radio link quality of a beam failure recovery candidate resource set or to continue to monitor the configured CORESET TCI in the second, active BWP.

18. The apparatus of claim 17, wherein the at least one processor is further configured to:

detect an expiration of a BWP inactivity timer, wherein the UE switches from the first, active BWP to the second, active BWP in response to the detecting the expiration of the BWP inactivity timer.

19. The apparatus of claim 17, wherein the UE continues to monitor the configured CORESET TCI in the second, active BWP when the first radio link quality of the configured CORESET TCI or the beam failure detection RS meets the threshold radio link quality.

20. The apparatus of claim 17, wherein the UE performs the measurement of the second radio link quality of the beam failure recovery candidate resource set when the first radio link quality of the configured CORESET TCI or the beam failure detection RS does not meet the threshold radio link quality.

21. The apparatus of claim 20, wherein the UE determines whether to perform a contention free random access procedure on a candidate beam or a contention based random access procedure on the candidate beam based on whether the measurement of the second radio link quality of the beam failure recovery candidate resource set meets a second threshold.

22. The apparatus of claim 21, wherein the at least one processor is further configured to:

perform the contention free random access procedure on the candidate beam when the second radio link quality meets the second threshold.

23. The apparatus of claim 21, wherein the at least one processor is further configured to:

perform the contention based random access procedure on the candidate beam when the second radio link quality does not meet the second threshold.

24. The apparatus of claim 17, wherein the at least one processor is further configured to:

receive a configuration of at least one value for transmission of a beam failure recovery signal or for transmission of another signal indicating a change of a preferred link to a base station.

25. The apparatus of claim 17, wherein the at least one processor is further configured to:

change at least one of a timer or a number of requests in a beam failure detection based on the switching to the second, active BWP.

26. The apparatus of claim 25, wherein the changing the at least one of the timer or the number of requests comprises reducing or disabling metrics relating to the at least one of the timer or the number of requests.

27. A computer-readable medium storing computer executable code for wireless communication at a User Equipment (UE), comprising code to:

switch from a first, active Bandwidth Part (BWP) to a second, active BWP;

measure a first radio link quality of a configured Control-resource set (CORESET) Transmission Configuration Indicator (TCI) or a beam failure detection Reference Signal (RS) upon switching to the second, active BWP; and

determine based on a threshold radio link quality whether to perform a measurement of a second radio link quality of a beam failure recovery candidate resource set or to continue to monitor the configured CORESET TCI in the second, active BWP.

28. The computer-readable medium of claim 27, further comprising code to:

detect an expiration of a BWP inactivity timer, wherein the UE switches from the first, active BWP to the second, active BWP in response to the detecting the expiration of the BWP inactivity timer.

29. The computer-readable medium of claim 27, further comprising code to:

perform the measurement of the second radio link quality of the beam failure recovery candidate resource set when the first radio link quality of the configured CORESET TCI or the beam failure detection RS does not meet the threshold radio link quality; and

perform a contention free random access procedure on a candidate beam or a contention based random access procedure on the candidate beam based on whether the measurement of the second radio link quality of the beam failure recovery candidate resource set meets a second threshold.

30. The computer-readable medium of claim 29, further comprising code to:

perform the contention free random access procedure on the candidate beam when the second radio link quality meets the second threshold; and

perform the contention based random access procedure on the candidate beam when the second radio link quality does not meet the second threshold.