Radio link failure declaration for full-duplex

1. A method of wireless communication performed by a user equipment, the method comprising:

communicating, with a base station, in a full-duplex mode using a first uplink beam and a first downlink beam;

detecting a beam failure of at least one of the first uplink beam or the first downlink beam; and

refraining, based at least in part on a determination that the beam failure is associated with self-interference in the full-duplex mode, from declaring a radio link failure.

2. The method of claim 1 , further comprising:

determining at least one of a signal-to-interference-plus-noise ratio or a block error rate based on a downlink channel measurement and an interference measurement; and

wherein the determining whether the beam failure is associated with the self-interference in the full-duplex mode is based on the at least one of the signal-to-interference-plus-noise ratio or the block error rate.

3. The method of claim 1 , further comprising:

transmitting, based at least in part on the determination that the beam failure is associated with the self-interference in the full-duplex mode, a beam failure recovery request using the first uplink beam.

4. The method of claim 1 , further comprising:

refraining, based at least in part on the determination that the beam failure is associated with the self-interference in the full-duplex mode, from adjusting a radio link failure parameter.

5. The method of claim 1 , further comprising:

refraining, based at least in part on the determination that the beam failure is associated with the self-interference in the full-duplex mode, from starting a radio link failure timer.

6. The method of claim 1 , further comprising:

determining at least one of a signal-to-noise ratio or a block error rate based on a downlink channel measurement; and

determining whether the beam failure is associated with a downlink quality degradation based on the at least one of the signal-to-noise ratio or the block error rate.

7. The method of claim 1 , further comprising:

receiving, from the base station, an uplink quality indication using the first downlink beam; and

determining whether the beam failure is associated with an uplink quality degradation based on the received uplink quality indication.

8. The method of claim 1 , further comprising:

selecting, based at least in part on a determination that the beam failure is associated with at least one of a downlink quality degradation or an uplink quality degradation, a second uplink beam from a plurality of candidate beams, the second uplink beam being different from the first uplink beam; and

performing a beam failure recovery procedure based on the selected second uplink beam.

9. The method of claim 8 , wherein the performing the beam failure recovery procedure comprises:

transmitting, in a physical random access channel using the second uplink beam, a random access preamble to indicate a beam failure recovery request.

10. The method of claim 8 , further comprising:

starting a radio link failure timer based on a number of out-of-sync events satisfying a threshold, and

wherein the performing the beam failure recovery procedure comprises:

performing the beam failure recovery procedure while the radio link failure timer is in progress.

11. The method of claim 10 , wherein:

the performing the beam failure recovery procedure comprises:

receiving a beam failure recovery success indication, and

the method further comprises:

stopping the radio link failure timer in response to receiving the beam failure recovery success indication.

12. The method of claim 1 , further comprising:

declaring a radio link failure based on at least one of a failure to receive a beam failure recovery success indication, a number of beam failure recovery random access preamble transmissions exceeding a threshold, or an expiration of a beam failure recovery timer.

13. The method of claim 1 , further comprising:

adjusting, based at least in part on a determination that the beam failure is associated with at least one of a downlink quality degradation or an uplink quality degradation, a radio link failure parameter.

14. A user equipment comprising:

a transceiver; and

a processor in communication with the transceiver, wherein the user equipment is configured to:

communicate, with a base station, in a full-duplex mode using a first uplink beam and a first downlink beam;

detect a beam failure of at least one of the first uplink beam or the first downlink beam; and

refrain, based at least in part on a determination that the beam failure is associated with self-interference in the full-duplex mode, from declaring a radio link failure.

15. The user equipment of claim 14 , wherein the user equipment is further configured to:

determine at least one of a signal-to-interference-plus-noise ratio or a block error rate based on a downlink channel measurement and an interference measurement; and

determine whether the beam failure is associated with the self-interference in the full-duplex mode based on the at least one of the signal-to-interference-plus-noise ratio or the block error rate.

16. The user equipment of claim 14 , wherein the user equipment is further configured to:

transmit, based at least in part on the determination that the beam failure is associated with the self-interference in the full-duplex mode, a beam failure recovery request using the first uplink beam.

17. The user equipment of claim 14 , wherein the user equipment is further configured to:

refrain, based at least in part on the determination that the beam failure is associated with the self-interference in the full-duplex mode, from adjusting a radio link failure parameter.

18. The user equipment of claim 14 , wherein the user equipment is further configured to;

refrain, based at least in part on the determination that the beam failure is associated with the self-interference in the full-duplex mode, from starting a radio link failure timer.

19. The user equipment of claim 14 , wherein the user equipment is further configured to:

determine at least one of a signal-to-noise ratio or a block error rate based on a downlink channel measurement; and

determine whether the beam failure is associated with a downlink quality degradation based on the at least one of the signal-to-noise ratio or the block error rate.

20. The user equipment of claim 14 , wherein the user equipment is further configured to:

receive, from the base station, an uplink quality indication using the first downlink beam; and

determine whether the beam failure is associated with an uplink quality degradation based on the received uplink quality indication.

21. The user equipment of claim 14 , wherein the user equipment is further configured to:

select, based at least in part on a determination that the beam failure is associated with at least one of a downlink quality degradation or an uplink quality degradation, a second uplink beam from a plurality of candidate beams, the second uplink beam being different from the first uplink beam; and

perform a beam failure recovery procedure based on the selected second uplink beam.

22. The user equipment of claim 21 , wherein the user equipment is further configured to;

transmit, in a physical random access channel using the second uplink beam, a random access preamble to indicate a beam failure recovery request.

23. The user equipment of claim 21 , wherein the user equipment is further configured to:

start a radio link failure timer based on a number of out-of-sync events satisfying a threshold; and

perform the beam failure recovery procedure while the radio link failure timer is in progress.

24. The user equipment of claim 23 , wherein the user equipment is further configured to:

receive a beam failure recovery success indication, and

stop the radio link failure timer in response to receiving the beam failure recovery success indication.

25. The user equipment of claim 14 , wherein the user equipment is further configured to:

declare a radio link failure based on at least one of a failure to receive a beam failure recovery success indication, a number of beam failure recovery random access preamble transmissions exceeding a threshold, or an expiration of a beam failure recovery timer.

26. The user equipment of claim 14 , wherein the user equipment is further configured to:

adjust, based at least in part on a determination that the beam failure is associated with at least one of a downlink quality degradation or an uplink quality degradation, a radio link failure parameter.

27. A non-transitory computer-readable medium having program code recorded thereon, the program code comprising:

code for causing the user equipment to communicate, with a base station, in a full-duplex mode using a first uplink beam and a first downlink beam;

code for causing the user equipment to detect a beam failure of at least one of the first uplink beam or the first downlink beam; and

code for causing the user equipment to refrain, based at least in part on a determination that the beam failure is associated with self-interference in the full-duplex mode, from declaring a radio link failure.

28. The non-transitory computer-readable medium of claim 27 , further comprising:

code for causing the user equipment to transmit, based at least in part on the determination that the beam failure is associated with the self-interference in the full-duplex mode, a beam failure recovery request using the first uplink beam.

29. A user equipment, comprising:

means for communicating, with a base station, in a full-duplex mode using a first uplink beam and a first downlink beam;

means for detecting a beam failure of at least one of the first uplink beam or the first downlink beam; and

means for refraining, based at least in part on a determination that the beam failure is associated with self-interference in the full-duplex mode, from declaring a radio link failure.

30. The user equipment of claim 29 , further comprising:

means for transmitting, based at least in part on the determination that the beam failure is associated with the self-interference in the full-duplex mode, a beam failure recovery request using the first uplink beam.