Beams for semi-persistent scheduling

1. A user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors, coupled to the memory, configured to:

receive, from a network entity, downlink control information (DCI) that activates a semi-persistent scheduling (SPS) configuration; and

receive, from the network entity, SPS transmissions in a plurality of SPS occasions that are according to the SPS configuration using at least one beam that is based at least in part on:

whether a scheduling offset between the DCI and the plurality of SPS occasions satisfies a threshold time duration,

whether a transmission configuration indicator (TCI) state, associated with a control resource set (CORESET) that carries the DCI and is used to determine the at least one beam, changes while the SPS configuration is active, or

whether a mapping of a TCI identifier, indicated by the DCI, to one or more TCI states changes while the SPS configuration is active.

2. The UE of claim 1 , wherein at least one default beam is used for an SPS occasion, of the plurality of SPS occasions, when the scheduling offset between the DCI and the SPS occasion does not satisfy the threshold time duration.

3. The UE of claim 2 , wherein the at least one default beam is associated with a single default TCI state based at least in part on whether the UE is configured with at least one TCI identifier that is mapped to a plurality of TCI states, and

wherein the single default TCI state is based at least in part on a quasi-co-location assumption associated with a CORESET associated with a lowest CORESET identifier of CORESETs monitored by the UE in a latest slot.

4. The UE of claim 2 , wherein the at least one default beam is associated with a plurality of default TCI states based at least in part on whether the UE is configured to enable a plurality of default beams, and

wherein the plurality of default TCI states are associated with a lowest TCI identifier of TCI identifiers that map to a plurality of TCI states.

5. The UE of claim 1 , wherein at least one indicated beam is used for an SPS occasion, of the plurality of SPS occasions, when the scheduling offset between the DCI and the SPS occasion satisfies the threshold time duration.

6. The UE of claim 5 , wherein the at least one indicated beam is associated with a single TCI state that is associated with the TCI identifier indicated in the DCI, or that is associated with the CORESET in which the DCI is received, or

wherein the at least one indicated beam is associated with a plurality of TCI states that are associated with the TCI identifier indicated in the DCI.

7. The UE of claim 1 , wherein one or more first SPS occasions, of the plurality of SPS occasions, before an end of the threshold time duration are associated with a single TCI state, and one or more second SPS occasions, of the plurality of SPS occasions, after the threshold time duration are associated with a plurality of TCI states.

8. The UE of claim 1 , wherein the scheduling offset between the DCI and the plurality of SPS occasions satisfies the threshold time duration based at least in part on a rule that indicates that the scheduling offset between the DCI and the plurality of SPS occasions is to satisfy the threshold time duration.

9. The UE of claim 1 , wherein one or more first SPS occasions, of the plurality of SPS occasions, before an end of the threshold time duration include a same quantity of transmission occasions as a quantity of transmission occasions included in one or more second SPS occasions, of the plurality of SPS occasions, after the threshold time duration.

10. The UE of claim 1 , wherein one or more SPS occasions, of the plurality of SPS occasions, after the threshold time duration are to use only one of a plurality of TCI states indicated for the plurality of SPS occasions.

11. The UE of claim 1 , wherein a TCI field is not present in the DCI,

wherein the TCI state associated with the CORESET is a first TCI state, and there is a change to the TCI state associated with the CORESET to a second TCI state while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on the second TCI state.

12. The UE of claim 1 , wherein a TCI field is not present in the DCI,

wherein the TCI state associated with the CORESET is a first TCI state, and there is a change to the TCI state associated with the CORESET to a second TCI state while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on the first TCI state.

13. The UE of claim 1 , wherein the one or more processors are further configured to:

deactivate the SPS configuration or determine that an error exists when there is a change to the TCI state associated with the CORESET to a different TCI state while the SPS configuration is active.

14. The UE of claim 1 , wherein the mapping of the TCI identifier to the one or more TCI states is a first mapping, and there is a change to the mapping to a second mapping of the TCI identifier to one or more different TCI states while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on whether a quantity of the one or more TCI states is the same as a quantity of the one or more different TCI states.

15. The UE of claim 1 , wherein the mapping of the TCI identifier to the one or more TCI states is a first mapping, and there is a change to the mapping to a second mapping of the TCI identifier to one or more different TCI states while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on the one or more different TCI states of the second mapping.

16. The UE of claim 1 , wherein the mapping of the TCI identifier to the one or more TCI states is a first mapping, and there is a change to the mapping to a second mapping of the TCI identifier to one or more different TCI states while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on the one or more TCI states of the first mapping.

17. The UE of claim 1 , wherein the one or more processors are further configured to:

deactivate the SPS configuration or determine that an error exists when there is a change to the mapping to a different mapping of the TCI identifier to one or more different TCI states while the SPS configuration is active.

18. A network entity for wireless communication, comprising:

a memory; and

one or more processors, coupled to the memory, configured to:

transmit, to a user equipment (UE), downlink control information (DCI) that activates a semi-persistent scheduling (SPS) configuration; and

transmit, to the UE, SPS transmissions in a plurality of SPS occasions that are according to the SPS configuration using at least one beam that is based at least in part on:

whether a scheduling offset between the DCI and the plurality of SPS occasions satisfies a threshold time duration,

whether a transmission configuration indicator (TCI) state, associated with a control resource set (CORESET) that carries the DCI and is used to determine the at least one beam, changes while the SPS configuration is active, or

whether a mapping of a TCI identifier, indicated by the DCI, to one or more TCI states changes while the SPS configuration is active.

19. The network entity of claim 18 , wherein at least one default beam is used for an SPS occasion, of the plurality of SPS occasions, when the scheduling offset between the DCI and the SPS occasion does not satisfy the threshold time duration.

20. The network entity of claim 18 , wherein at least one indicated beam is used for an SPS occasion, of the plurality of SPS occasions, when the scheduling offset between the DCI and the SPS occasion satisfies the threshold time duration.

21. The network entity of claim 18 , wherein a TCI field is not present in the DCI,

wherein the TCI state associated with the CORESET is a first TCI state, and there is a change to the TCI state associated with the CORESET to a second TCI state while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on the second TCI state.

22. The network entity of claim 18 , wherein a TCI field is not present in the DCI,

wherein the TCI state associated with the CORESET is a first TCI state, and there is a change to the TCI state associated with the CORESET to a second TCI state while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on the first TCI state.

23. The network entity of claim 18 , wherein the mapping of the TCI identifier to the one or more TCI states is a first mapping, and there is a change to the mapping to a second mapping of the TCI identifier to one or more different TCI states while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on whether a quantity of the one or more TCI states is the same as a quantity of the one or more different TCI states.

24. The network entity of claim 18 , wherein the mapping of the TCI identifier to the one or more TCI states is a first mapping, and there is a change to the mapping to a second mapping of the TCI identifier to one or more different TCI states while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on the one or more different TCI states of the second mapping.

25. The network entity of claim 18 , wherein the mapping of the TCI identifier to the one or more TCI states is a first mapping, and there is a change to the mapping to a second mapping of the TCI identifier to one or more different TCI states while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on the one or more TCI states of the first mapping.

26. A method of wireless communication performed by a user equipment (UE), comprising:

receiving, from a network entity, downlink control information (DCI) that activates a semi-persistent scheduling (SPS) configuration; and

receiving, from the network entity, SPS transmissions in a plurality of SPS occasions that are according to the SPS configuration using at least one beam that is based at least in part on:

whether a scheduling offset between the DCI and the plurality of SPS occasions satisfies a threshold time duration,

whether a transmission configuration indicator (TCI) state, associated with a control resource set (CORESET) that carries the DCI and is used to determine the at least one beam, changes while the SPS configuration is active, or

whether a mapping of a TCI identifier, indicated by the DCI, to one or more TCI states changes while the SPS configuration is active.

27. The method of claim 26 , wherein a TCI field is not present in the DCI,

wherein the TCI state associated with the CORESET is a first TCI state, and there is a change to the TCI state associated with the CORESET to a second TCI state while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on the second TCI state.

28. The method of claim 26 , wherein a TCI field is not present in the DCI,

wherein the TCI state associated with the CORESET is a first TCI state, and there is a change to the TCI state associated with the CORESET to a second TCI state while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on the first TCI state.

29. A method of wireless communication performed by a network entity, comprising:

transmitting, to a user equipment (UE), downlink control information (DCI) that activates a semi-persistent scheduling (SPS) configuration; and

transmitting, to the UE, SPS transmissions in a plurality of SPS occasions that are according to the SPS configuration using at least one beam that is based at least in part on:

whether a scheduling offset between the DCI and the plurality of SPS occasions satisfies a threshold time duration,

whether a transmission configuration indicator (TCI) state, associated with a control resource set (CORESET) that carries the DCI and is used to determine the at least one beam, changes while the SPS configuration is active, or

whether a mapping of a TCI identifier, indicated by the DCI, to one or more TCI states changes while the SPS configuration is active.

30. The method of claim 29 , wherein the mapping of the TCI identifier to the one or more TCI states is a first mapping, and there is a change to the mapping to a second mapping of the TCI identifier to one or more different TCI states while the SPS configuration is active, and

wherein the at least one beam used for an SPS occasion, of the plurality of SPS occasions, after the change is based at least in part on whether a quantity of the one or more TCI states is the same as a quantity of the one or more different TCI states.