Multi-link control beam switching

1. A method for wireless communications by a user equipment (UE), comprising:

obtaining a configuration, from a downlink control information (DCI) in a first signal from a base station (BS), comprising at least one first pattern of beams to monitor when performing a beam recovery procedure;

sending a first acknowledgment of the DCI to the BS;

communicating using beamforming, with the BS, via an active transmit and receive beam pair;

determining a beam failure of the active transmit and receive beam pair; and

monitoring the beams according to the first pattern in response to determining the beam failure.

2. The method of claim 1 , wherein sending the first acknowledgment comprises transmitting an acknowledgment (ACK) of a second signal, different from the first signal, received from the BS via a beam in the first pattern of beams.

3. The method of claim 1 , wherein

sending the first acknowledgment comprises transmitting a negative acknowledgment (NAK) of a second signal, different from the first signal, received from the BS via a beam in the first pattern of beams.

4. The method of claim 1 , wherein the configuration comprises a plurality of patterns, and the method further comprises:

receiving an indication to switch from the first pattern to a second pattern in the plurality of patterns;

sending a second acknowledgment of the indication; and

monitoring beams in the second pattern according to the second pattern.

5. The method of claim 4 , wherein sending the second acknowledgment comprises transmitting an acknowledgment (ACK) of a second signal, different from the first signal, received from the BS via a beam in the second pattern of beams.

6. The method of claim 4 , wherein sending the second acknowledgment comprises transmitting a negative acknowledgment (NAK) of a second signal, different from the first signal, received from the BS via a beam in the second pattern of beams.

7. The method of claim 4 , wherein:

the first pattern of beams is the active transmit and receive beam pair; and

the second pattern of beams is another transmit and receive beam pair.

8. The method of claim 1 , further comprising:

transmitting a physical uplink control channel (PUCCH) to the BS via a transmit beam selected according to the first pattern of beams subsequent to determining the beam failure.

9. The method of claim 1 , wherein the at least one first pattern of beams comprises a first beam and a second beam, wherein at least one of:

the first beam is monitored during slots with even indices and the second beam is monitored during slots with odd indices,

the first beam is monitored for a first set of 39 slots and the second beam is monitored for a second set of 1 slot, or

beam is monitored for a first set of 1 slot and the second beam is monitored for a second set of 39 slots.

10. A method for wireless communications by a base station (BS), comprising:

providing a configuration, in a downlink control information (DCI) to a user equipment (UE), comprising at least one first pattern of beams to monitor when performing a beam recovery procedure;

receiving a first acknowledgment of the DCI from the UE;

communicating using beamforming, with the UE, via an active transmit and receive beam pair;

determining a beam failure of the active transmit and receive beam pair; and

sending, to the UE and via a transmit beam in the first pattern of beams, an indication to monitor a second pattern of beams, in response to determining the beam failure.

11. The method of claim 10 , further comprising:

transmitting a second signal, different from the first signal, via a beam in the first pattern of beams, wherein receiving the first acknowledgment comprises receiving an acknowledgment (ACK) of the second signal from the UE.

12. The method of claim 10 , further comprising:

transmitting a second signal, different from the first signal, via a beam in the first pattern of beams, wherein receiving the first acknowledgment comprises receiving a negative acknowledgment (NAK) of the second signal from the UE.

13. The method of claim 10 , further comprising:

receiving a second acknowledgment of the indication; and

transmitting at least one transmission to the UE in a transmit beam selected according to the second pattern in response to receiving the second acknowledgment.

14. The method of claim 13 , wherein receiving the second acknowledgment comprises receiving an acknowledgment (ACK) of the at least one transmission to the UE in the transmit beam selected according to the second pattern.

15. The method of claim 13 , wherein receiving the second acknowledgment comprises receiving a negative acknowledgment (NAK) of the at least one transmission to the UE in the transmit beam selected according to the second pattern.

16. The method of claim 13 , wherein:

the first pattern of beams is the active transmit and receive beam pair; and

the second pattern of beams is another transmit and receive beam pair.

17. The method of claim 10 , further comprising:

receiving a physical uplink control channel (PUCCH) from the UE via a transmit beam selected according to the first pattern of beams subsequent to determining the beam failure.

18. An apparatus for wireless communications, comprising:

a processor configured to:

obtain a configuration, from a downlink control information (DCI) in a first signal from a base station (BS), comprising at least one first pattern of beams to monitor when performing a beam recovery procedure;

cause the apparatus to send a first acknowledgment of the DCI to the BS;

cause the apparatus to communicate using beamforming, with the BS, via an active transmit and receive beam pair;

determine a beam failure of the active transmit and receive beam pair; and

cause the apparatus to monitor the beams according to the first pattern in response to determining the beam failure; and

a memory coupled with the processor.

19. The apparatus of claim 18 , wherein the processor is configured to cause the apparatus to send the first acknowledgment by causing the apparatus to transmit an acknowledgment (ACK) of a second signal, different from the first signal, received from the BS via a beam in the first pattern of beams.

20. The apparatus of claim 18 , wherein the processor is configured to cause the apparatus to send the first acknowledgment by causing the apparatus to transmit a negative acknowledgment (NAK) of a second signal, different from the first signal, received from the BS via a beam in the first pattern of beams.

21. The apparatus of claim 18 , wherein the configuration comprises a plurality of patterns, and the processor is further configured to:

cause the apparatus to receive an indication to switch from the first pattern to a second pattern in the plurality of patterns;

cause the apparatus to send a second acknowledgment of the indication; and

cause the apparatus to monitor beams in the second pattern according to the second pattern.

22. The apparatus of claim 21 , wherein the processor is configured to cause the apparatus to send the second acknowledgment by causing the apparatus to transmit an acknowledgment (ACK) of a second signal, different from the first signal, received from the BS via a beam in the second pattern of beams.

23. The apparatus of claim 21 , wherein the processor is configured to cause the apparatus to send the second acknowledgment by causing the apparatus to transmit a negative acknowledgment (NAK) of a second signal, different from the first signal, received from the BS via a beam in the second pattern of beams.

24. The apparatus of claim 21 , wherein:

the first pattern of beams is the active transmit and receive beam pair; and

the second pattern of beams is another transmit and receive beam pair.

25. An apparatus for wireless communications, comprising:

a processor configured to:

cause the apparatus to provide a configuration, in a downlink control information (DCI) to a user equipment (UE), comprising at least one first pattern of beams to monitor when performing a beam recovery procedure;

cause the apparatus to receive a first acknowledgment of the DCI from the UE;

cause the apparatus to communicate using beamforming, with the UE, via an active transmit and receive beam pair;

determine a beam failure of the active transmit and receive beam pair; and

cause the apparatus to send, to the UE and via a transmit beam in the first pattern of beams, an indication to monitor a second pattern of beams, in response to determining the beam failure; and

a memory coupled with the processor.

26. The apparatus of claim 25 , wherein the processor is configured to:

cause the apparatus to transmit a second signal, different from the first signal, via a beam in the first pattern of beams; and

cause the apparatus to receive the first acknowledgment by causing the apparatus to receive an acknowledgment (ACK) of the second signal from the UE.

27. The apparatus of claim 25 , wherein the processor is configured to:

cause the apparatus to transmit a second signal, different from the first signal, via a beam in the first pattern of beams; and

cause the apparatus to receive the first acknowledgment by causing the apparatus to receive a negative acknowledgment (NAK) of the second signal from the UE.

28. The apparatus of claim 25 , wherein the processor is configured to:

cause the apparatus to receive a second acknowledgment of the indication; and

cause the apparatus to transmit at least one transmission to the UE in a transmit beam selected according to the second pattern in response to receiving the second acknowledgment.

29. The apparatus of claim 28 , wherein the processor is configured to cause the apparatus to receive the second acknowledgment by causing the apparatus to receive an acknowledgment (ACK) from the UE of the at least one transmission.

30. The apparatus of claim 28 , wherein the processor is configured to cause the apparatus to receive the second acknowledgment by causing the apparatus to receive a negative acknowledgment (NAK) from the UE of the at least one transmission.

31. The apparatus of claim 28 , wherein:

the first pattern of beams is the active transmit and receive beam pair; and

the second pattern of beams is another transmit and receive beam pair.