Beam switching gap

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

receiving an allocation from a base station (BS) including at least one symbol beam switching gap based, at least in part, on a subcarrier spacing (SCS) of the UE, wherein receiving the allocation from the BS for the at least one symbol beam switching gap comprises:

detecting one or more grants from the BS;

determining the at least one symbol beam switching gap is not allocated in time domain resources allocated by a first grant when there is another grant that indicates the same beam is used for adjacent time domain resources after the time domain resources allocated by the first grant; and

determining the at least one symbol beam switching gap is allocated in the time domain resources allocated by the first grant when:

there is another grant that indicates a different beam is used for the adjacent time domain resources after the time domain resources allocated by the first grant, or

no other grant is received to allocate the time domain resources after the adjacent time domain resources allocated by the first grant; and

communicating with the BS using the allocation.

2. The method of claim 1 , further comprising providing beam switching capability information to the BS, wherein the allocation includes the at least one symbol beam switching gap further based on the beam switching capability information.

3. The method of claim 1 , wherein communicating with the BS using the allocation comprises switching beams during the at least one symbol beam switching gap in a first uplink or downlink transmission to use for a second uplink or downlink transmission.

4. The method of claim 3 , wherein the first uplink or downlink transmission comprises a transmission on a channel using a first beam, and the second uplink or downlink transmission comprises a transmission on the channel using a second beam.

5. The method of claim 3 , wherein the first uplink or downlink transmission comprises a transmission on a shared channel, and the second uplink or downlink transmission comprises a transmission on a control channel.

6. The method of claim 3 , wherein the uplink transmission comprises a physical uplink shared channel (PUSCH) transmission and the downlink transmission comprises a physical downlink shared channel (PDSCH) transmission.

7. The method of claim 1 , wherein the allocation from the BS comprises downlink control information (DCI) with a time domain resource allocation (TDRA) field indicating one of multiple radio resource control (RRC) TDRA configurations.

8. The method of claim 7 , wherein:

the TDRA configuration configures a number of symbols for uplink or downlink transmission; and

the number of symbols is reduced by at least one symbol when the at least one symbol beam switching gap is allocated.

9. The method of claim 8 , wherein the number of symbols is indicated by a start and length indicator value (SLIV) field in the TDRA.

10. The method of claim 9 , wherein a first SLIV field is used when the at least one symbol beam switching gap is not allocated and a separate second SLIV field is used when the at least one symbol beam switching gap is allocated.

11. The method of claim 9 , wherein a single SLIV field is used and a bit in the DCI indicates whether the at least one symbol is included.

12. The method of claim 1 , further comprising:

demodulating a downlink transmission; and

nulling log likelihood ratios (LLRs) for resource elements (REs) in at least one symbol when the at least on symbol beam switching gap is allocated.

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

sending an allocation to a user equipment (UE) including at least one symbol beam switching gap based, at least in part, on a subcarrier spacing (SCS) of the UE, wherein sending the allocation comprises:

sending a first grant to the UE allocating first time domain resources using a beam and a second grant allocating adjacent second time domain resources using the same beam to indicate the at least one symbol beam switching gap is not allocated in the first time domain resources allocated by the first grant; and

sending the first grant to the UE allocating first time domain resources using the beam and the second grant allocating adjacent second time domain resources using a different beam to indicate the at least one symbol beam switching gap is allocated in the first time domain resources allocated by the first grant; and

communicating with the UE using the allocation.

14. The method of claim 13 , further comprising receiving beam switching capability information from the UE, wherein sending the allocation including the at least one symbol beam switching gap is further based, at least in part, on the beam switching capability information.

15. The method of claim 13 , wherein communicating with the UE using the allocation comprises switching beams during the at least one symbol beam switching gap in a first uplink or downlink transmission to use for a second uplink or downlink transmission.

16. The method of claim 15 , wherein the first uplink or downlink transmission comprises a transmission on a channel using a first beam, and the second uplink or downlink transmission comprises a transmission on the channel using a second beam.

17. The method of claim 15 , wherein the first uplink or downlink transmission comprises a transmission on a shared channel, and the second uplink or downlink transmission comprises a transmission on a control channel.

18. The method of claim 15 , wherein the uplink transmission comprises a physical uplink shared channel (PUSCH) transmission and the downlink transmission comprises a physical downlink shared channel (PDSCH) transmission.

19. The method of claim 13 , wherein sending the allocation to the UE including the at least one symbol beam switching gap is further based on a beam switching capability of the BS.

20. The method of claim 19 , wherein the beam switching capability of the BS is based on a number of active users and a number of antenna panels at the BS.

21. The method of claim 13 , wherein the allocation comprises downlink control information (DCI) with a time domain resource allocation (TDRA) field indicating a radio resource control (RRC) TDRA configuration.

22. The method of claim 21 , wherein:

the TDRA configuration configures a number of symbols for uplink or downlink transmission; and

the number of symbols is reduced by at least one symbol when the at least one symbol beam switching gap is allocated.

23. The method of claim 22 , wherein the number of symbols is indicated by a start and length indicator value (SLIV).

24. The method of claim 23 , wherein a first SLIV field is used when the at least one symbol beam switching gap is not allocated and a separate second SLIV field is used when the at least one symbol beam switching gap is allocated.

25. The method of claim 23 , wherein a single SLIV field is used and a bit in the DCI indicates whether the at least one symbol beam switching gap is included.

26. The method of claim 13 , further comprising:

refraining from scheduling demodulation reference signals (DMRS) and downlink control information (DCI) in the at least one symbol beam switching gap.

27. The method of claim 13 , further comprising:

nulling log likelihood ratios (LLRs) for resource elements (REs) in at least one symbol when the at least one symbol beam switching gap is not allocated.

28. An apparatus, comprising:

a memory; and

at least one processor coupled with the memory and configured to:

receive an allocation from a base station (BS) including at least one symbol beam switching gap based, at least in part, on a subcarrier spacing (SCS) of the apparatus, wherein in order to receive the allocation from the BS, the processor is configured to cause the apparatus to:

detect one or more grants from the BS;

determine the at least one symbol beam switching gap is not allocated in time domain resources allocated by a first grant when there is another grant that indicates the same beam is used for adjacent time domain resources after the time domain resources allocated by the first grant; and

determine the at least one symbol beam switching gap is allocated in the time domain resources allocated by the first grant when:

there is another grant that indicates a different beam is used for the adjacent time domain resources after the time domain resources allocated by the first grant, or

no other grant is received to allocate the time domain resources after the adjacent time domain resources allocated by the first grant; and

communicate with the BS using the allocation.

29. The apparatus of claim 28 , wherein the processor is further configured to: provide beam switching capability information to the BS, wherein the allocation includes that at least one symbol beam switching gap further based on the beam switching capability information.

30. The apparatus of claim 28 , wherein the processor is configured to communicate with the BS using the allocation by switching beams during at least one symbol in a first uplink or downlink transmission to use for a second uplink or downlink transmission.

31. The apparatus of claim 28 , wherein the allocation from the BS comprises downlink control information (DCI) with a time domain resource allocation (TDRA) field indicating one of multiple radio resource control (RRC) TDRA configurations.

32. An apparatus, comprising:

a memory; and

at least one processor coupled with the memory and configured to:

send an allocation to a user equipment (UE) including at least one symbol beam switching gap based, at least in part, on a subcarrier spacing (SCS) of the UE, wherein in order to send the allocation to the UE, the processor is configured to cause the apparatus to:

send a first grant to the UE allocating first time domain resources using a beam and a second grant allocating adjacent second time domain resources using the same beam to indicate the at least one symbol beam switching gap is not allocated in the first time domain resources allocated by the first grant; and

send the first grant to the UE allocating first time domain resources using the beam and the second grant allocating adjacent second time domain resources using a different beam to indicate the at least one symbol beam switching gap is allocated in the first time domain resources allocated by the first grant; and

communicate with the UE using the allocation.

33. The apparatus of claim 32 , wherein the processor is further configured to receive beam switching capability information from the UE, and wherein the processor is configured to send the allocation based, at least in part, on the beam switching capability information.

34. The apparatus of claim 32 , wherein the processor is configured to communicate with the UE using the allocation by switching beams during at least one symbol in a first uplink or downlink transmission to use for a second uplink or downlink transmission.

35. The apparatus of claim 32 , wherein the allocation comprises downlink control information (DCI) with a time domain resource allocation (TDRA) field indicating a radio resource control (RRC) TDRA configuration.

36. An apparatus, comprising:

means for receiving an allocation from a base station (BS) including at least one symbol beam switching gap based, at least in part, on a subcarrier spacing (SCS) of the apparatus, wherein the means for receiving the allocation from the BS for the at least one symbol beam switching gap comprises:

means for detecting one or more grants from the BS;

means for determining the at least one symbol beam switching gap is not allocated in time domain resources allocated by a first grant when there is another grant that indicates the same beam is used for adjacent time domain resources after the time domain resources allocated by the first grant; and

means for determining the at least one symbol beam switching gap is allocated in the time domain resources allocated by the first grant when:

there is another grant that indicates a different beam is used for the adjacent time domain resources after the time domain resources allocated by the first grant, or

no other grant is received to allocate the time domain resources after the adjacent time domain resources allocated by the first grant; and

means for communicating with the BS using the allocation.

37. An apparatus, comprising:

means for sending an allocation to a user equipment (UE) including at least one symbol beam switching gap based, at least in part, on a subcarrier spacing (SCS) of the UE, wherein the means for sending the allocation to the UE comprises:

means for sending a first grant to the UE allocating first time domain resources using a beam and a second grant allocating adjacent second time domain resources using the same beam to indicate the at least one symbol beam switching gap is not allocated in the first time domain resources allocated by the first grant; and

means for sending the first grant to the UE allocating first time domain resources using the beam and the second grant allocating adjacent second time domain resources using a different beam to indicate the at least one symbol beam switching gap is allocated in the first time domain resources allocated by the first grant; and

means for communicating with the UE using the allocation.

38. A non-transitory computer readable medium storing computer executable code thereon which, when executed by a processor, performs an operation for wireless communications by a user equipment (UE) comprising:

receiving an allocation from a base station (BS) including at least one symbol beam switching gap based, at least in part, on a subcarrier spacing (SCS) of the UE, wherein receiving the allocation from the B S for the at least one symbol beam switching gap comprises:

detecting one or more grants from the BS;

determining the at least one symbol beam switching gap is not allocated in time domain resources allocated by a first grant when there is another grant that indicates the same beam is used for adjacent time domain resources after the time domain resources allocated by the first grant; and

determining the at least one symbol beam switching gap is allocated in the time domain resources allocated by the first grant when:

there is another grant that indicates a different beam is used for the adjacent time domain resources after the time domain resources allocated by the first grant, or

no other grant is received to allocate the time domain resources after the adjacent time domain resources allocated by the first grant; and

communicating with the BS using the allocation.

39. A non-transitory computer readable medium storing computer executable code thereon which, when executed by a processor, performs an operation for wireless communications by a base station comprising:

sending an allocation to a user equipment (UE) including at least one symbol beam switching gap based, at least in part, on a subcarrier spacing (SCS) of the UE, wherein sending the allocation to the UE comprises:

sending a first grant to the UE allocating first time domain resources using a beam and a second grant allocating adjacent second time domain resources using the same beam to indicate the at least one symbol beam switching gap is not allocated in the first time domain resources allocated by the first grant; and

sending the first grant to the UE allocating first time domain resources using the beam and the second grant allocating adjacent second time domain resources using a different beam to indicate the at least one symbol beam switching gap is allocated in the first time domain resources allocated by the first grant; and

communicating with the UE using the allocation.