Candidate transmission configuration information states for slot aggregation
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may determine, during a multi-slot downlink transmission, that a mapping from a transmission configuration information (TCI) state index to a first TCI state configuration has changed to a second TCI state configuration. The UE may select, based at least in part on the determined change, the first TCI state configuration or the second TCI state configuration to use for at least a portion of the multi-slot downlink transmission. The UE may receive the multi-slot downlink transmission during one or more slots according to the selected TCI state configuration and the TCI state index.
1. A method for wireless communication at a user equipment (UE), comprising:
determining, during an uplink transmission, that a mapping from a resource index to a first spatial relation has changed to being mapped to a second spatial relation;
selecting, based at least in part on the determined change, the first spatial relation or the second spatial relation to use for the uplink transmission; and
transmitting the uplink transmission according to the selected spatial relation and the resource index.
2. The method of claim 1 , wherein at least the first spatial relation and the spatial relation are activated spatial relations, and the activated spatial relations remain unchanged during each slot of a multi-slot uplink transmission.
3. The method of claim 1 , wherein at least the first spatial relation and the spatial relation are activated spatial relations, and the activated spatial relations are determined based on an initial slot of a multi-slot uplink transmission.
4. The method of claim 1 , further comprising:
determining that a spatial relation is configured at the UE that identifies a plurality of aggregated uplink transmissions for two or more consecutive slots of a multi-slot uplink transmission; and
applying a same spatial relation for spatial transmission parameters for each of the two or more consecutive slots.
5. The method of claim 1 , wherein the uplink transmission comprises a single slot uplink transmission, further comprising:
selecting the second spatial relation for the uplink transmission.
6. The method of claim 1 , further comprising:
selecting the first spatial relation to use during each slot of the uplink transmission.
7. The method of claim 6 , wherein the first spatial relation is determined based at least in part on a first slot of the uplink transmission.
8. The method of claim 6 , wherein the first spatial relation is determined based at least in part on a slot containing a signal scheduling the uplink transmission.
9. The method of claim 1 , further comprising:
selecting the first spatial relation to use during a first subset of slots of the uplink transmission; and
selecting the second spatial relation to use during a second subset of slots of the uplink transmission, the first subset of slots occurring before the determined change and the second subset of slots occurring after the determined change.
10. The method of claim 1 , further comprising:
determining that the determined change occurs during the uplink transmission; and
refraining, based at least in part on the determined change occurring during the uplink transmission, from implementing the determined change.
11. The method of claim 1 , further comprising:
receiving a signal reconfiguring a set of candidate resource indices from a first set of spatial relations to a second set of spatial relations, wherein the determined change is based at least in part on the signal.
12. The method of claim 11 , wherein the signal comprises at least one of a medium access control (MAC) control element (CE), a radio resource control (RRC) signal, a downlink control information (DCI) field, or a combination thereof.
13. The method of claim 11 , wherein the resource index comprises at least one of a sounding reference signal (SRS) index, a physical uplink control channel (PUCCH) resource, or a combination thereof.
14. The method of claim 1 , wherein the uplink transmission comprises at least one of a data transmission, a control transmission, a reference signal transmission, or a combination thereof.