Beam failure recovery in connection with switching BWP

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

detecting an expiration of a BWP inactivity timer;

switching from a first, active Bandwidth Part (BWP) to a second, active BWP, wherein the UE autonomously switches from the first, active BWP to the second, active BWP in response to the detecting the expiration of the BWP inactivity timer, the second BWP comprises a previously active BWP, and wherein switching comprises falling back from the first BWP to the second BWP;

reducing at least one of a timer or a number of requests in a beam failure detection based on the falling back to the 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 and the switching, 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, wherein determining whether to perform the measurement of the second radio link quality comprises determining based on beam failure detection based on the timer or the number of requests.

2. The method of claim 1 , wherein one or more of:

the detecting the expiration of a BWP inactivity timer comprises detecting a time interval without communication from the base station on the second, active BWP.

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

means for detecting an expiration of a BWP inactivity timer;

means for switching from a first, active Bandwidth Part (BWP) to a second, active BWP, wherein the UE autonomously switches from the first, active BWP to the second, active BWP in response to the detecting the expiration of the BWP inactivity timer, the second BWP comprises a previously active BWP, and wherein switching comprises falling back from the first BWP to the second BWP;

means for reducing at least one of a timer or a number of requests in a beam failure detection based on the falling back to the 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 and the switching, 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 wherein determining whether to perform the measurement of the second radio link quality comprises determining based on beam failure detection based on the timer or the number of requests changed based on the switching.

11. The apparatus of claim 10 , wherein one or more of:

the detecting the expiration of a BWP inactivity timer comprises detecting a time interval without communication from the base station on the second, active BWP.

12. The apparatus of claim 10 , 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.

13. The apparatus of claim 10 , further comprising:

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

14. 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 cause the UE to:

detect an expiration of a BWP inactivity timer;

switch from a first, active Bandwidth Part (BWP) to a second, active BWP, wherein the UE autonomously switches from the first, active BWP to the second, active BWP in response to the detecting the expiration of the BWP inactivity timer, the second BWP comprises a previously active BWP, and wherein switching comprises falling back from the first BWP to the second BWP;

reduce at least one of a timer or a number of requests in a beam failure detection based on the falling back to the 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 and the switching, 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, wherein determining whether to perform the measurement of the second radio link quality comprises determining based on beam failure detection based on the timer or the number of requests changed based on the switching.

15. The apparatus of claim 14 , wherein one or more of:

the detecting the expiration of a BWP inactivity timer comprises detecting a time interval without communication from the base station on the second, active BWP.

16. The apparatus of claim 14 , 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.

17. The apparatus of claim 14 , 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.

18. The apparatus of claim 17 , 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.

19. The apparatus of claim 18 , 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.

20. The apparatus of claim 18 , 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.

21. The apparatus of claim 14 , 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.

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

detect an expiration of a BWP inactivity timer;

switch from a first, active Bandwidth Part (BWP) to a second, active BWP, wherein the UE autonomously switches from the first, active BWP to the second, active BWP in response to the detecting the expiration of the BWP inactivity timer, the second BWP comprises a previously active BWP, and wherein switching comprises falling back from the first BWP to the second BWP;

reduce at least one of a timer or a number of requests in a beam failure detection based on the falling back to the 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 and the switching, 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, wherein determining whether to perform the measurement of the second radio link quality comprises determining based on beam failure detection based on the timer or the number of requests changed based on the switching.

23. The computer-readable medium of claim 22 , wherein one or more of:

the detecting the expiration of a BWP inactivity timer comprises detecting a time interval without communication from the base station on the second, active BWP.

24. The computer-readable medium of claim 22 , 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.

25. The computer-readable medium of claim 24 , 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.