Spatial filters in full duplex mode
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station in a full duplex mode, a first downlink transmission associated with a spatial filter. The UE may decode the first downlink transmission according to a default transmission configuration indicator (TCI) state that indicates the spatial filter. The default TCI state may be based at least in part on a first active TCI state for the full duplex mode. Numerous other aspects are provided.
1. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the memory and the one or more processors configured to:
receive, from a base station in a full duplex mode, a first downlink transmission associated with a spatial filter; and
decode the first downlink transmission according to a default transmission configuration indicator (TCI) state that indicates the spatial filter, wherein the default TCI state is based at least in part on a first active TCI state for the full duplex mode.
2. The UE of claim 1 , wherein the first downlink transmission includes a channel state information reference signal, a physical downlink shared channel message, or a combination thereof.
3. The UE of claim 1 , wherein the first downlink transmission is scheduled by downlink control information (DCI).
4. The UE of claim 3 , wherein decoding the first downlink transmission comprises decoding the first downlink transmission according to the default TCI state when the DCI does not indicate a TCI state for the first downlink transmission.
5. The UE of claim 3 , wherein decoding the first downlink transmission comprises decoding the first downlink transmission according to the default TCI state when an amount of time between the UE receiving the DCI and the UE receiving the first downlink transmission satisfies a threshold.
6. The UE of claim 1 , wherein the first active TCI state is associated with a second downlink transmission that includes at least one same symbol as the first downlink transmission.
7. The UE of claim 1 , wherein the first active TCI state for the full duplex mode is independent of a second active TCI state for a half duplex mode.
8. The UE of claim 1 , wherein the first active TCI state is selected as the default TCI state based at least in part on a determination that the first active TCI state is associated with a set of resources when the set of resources is within a same type of symbols as the first downlink transmission.
9. The UE of claim 8 , wherein the set of resources is a control resource set.
10. The UE of claim 1 , wherein the first downlink transmission includes a type of symbols, and the first active TCI state is selected as the default TCI state based at least in part on a determination that the first active TCI state is associated with the type of symbols.
11. The UE of claim 1 , wherein the first active TCI state is associated with a lowest identifier of one or more TCI states for the full duplex mode associated with a physical downlink shared channel.
12. The UE of claim 1 , wherein the first active TCI state is selected as the default TCI state based at least in part on a determination that the first active TCI state is usable for the full duplex mode.
13. The UE of claim 1 , wherein the first active TCI state is selected as the default TCI state based at least in part on a determination that a second active TCI state is not usable for the full duplex mode.
14. The UE of claim 1 , wherein the first downlink transmission is received from a transmit-receive point (TRP) of a plurality of TRPs of the base station, and the first active TCI state is selected as the default TCI state based at least in part on a determination that the first active TCI state is associated with the TRP.
15. The UE of claim 1 , wherein the base station, when in the full duplex mode, transmits and receives, in a same frequency bandwidth, concurrently.
16. The UE of claim 1 , wherein the base station, when in the full duplex mode, transmits a first set of symbols and receives a second set of symbols, in a same frequency bandwidth, wherein the first set of symbols and the second set of symbols are separated in time by less than a threshold.
17. The UE of claim 1 , wherein the base station, when in the full duplex mode, transmits a first set of symbols in a first frequency bandwidth and, concurrently, receives a second set of symbols in a second frequency bandwidth, wherein the first frequency bandwidth and the second frequency bandwidth are separated in frequency by less than a threshold.
18. A base station for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the memory and the one or more processors configured to:
transmit, to a user equipment (UE) in a full duplex mode, a first downlink transmission associated with a spatial filter, wherein the first downlink transmission is transmitted according to a default transmission configuration indicator (TCI) state that indicates the spatial filter, wherein the default TCI state is based at least in part on a first active TCI state for the full duplex mode; and
receive, from the UE, measurements related to the first downlink transmission, based at least in part on transmitting the first downlink transmission.
19. A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a base station in a full duplex mode, a first downlink transmission associated with a spatial filter; and
decoding the first downlink transmission according to a default transmission configuration indicator (TCI) state that indicates the spatial filter, wherein the default TCI state is based at least in part on a first active TCI state for the full duplex mode.
20. The method of claim 19 , wherein the first downlink transmission includes a channel state information reference signal, a physical downlink shared channel message, or a combination thereof.
21. The method of claim 19 , wherein the first downlink transmission is scheduled by downlink control information (DCI).
22. The method of claim 21 , wherein the decoding comprises decoding the first downlink transmission according to the default TCI state when the DCI does not indicate a TCI state for the first downlink transmission.
23. The method of claim 21 , wherein the decoding comprises decoding the first downlink transmission according to the default TCI state when an amount of time between the UE receiving the DCI and the UE receiving the first downlink transmission satisfies a threshold.
24. The method of claim 19 , wherein the first active TCI state is selected as the default TCI state based at least in part on a determination that the first active TCI state is associated with a control resource set (CORESET) when the CORESET is within a same type of symbols as the first downlink transmission.
25. The method of claim 19 , wherein the first downlink transmission includes a type of symbols, and the first active TCI state is selected as the default TCI state based at least in part on a determination that the first active TCI state is associated with the type of symbols.
26. The method of claim 19 , wherein the first active TCI state is associated with a lowest identifier of one or more TCI states for the full duplex mode associated with a physical downlink shared channel.
27. The method of claim 19 , wherein the first active TCI state is selected as the default TCI state based at least in part on a determination that the first active TCI state is usable for the full duplex mode.
28. The method of claim 19 , wherein the first active TCI state is selected as the default TCI state based at least in part on a determination that a second active TCI state is not usable for the full duplex mode.
29. The method of claim 19 , wherein the first downlink transmission is received from a transmit-receive point (TRP) of a plurality of TRPs of the base station, and the first active TCI state is selected as the default TCI state based at least in part on a determination that the first active TCI state is associated with the TRP.
30. A method of wireless communication performed by a base station, comprising:
transmitting, to a user equipment (UE) in a full duplex mode, a first downlink transmission associated with a spatial filter, wherein the first downlink transmission is transmitted according to a default transmission configuration indicator (TCI) state that indicates the spatial filter, wherein the default TCI state is based at least in part on a first active TCI state for the full duplex mode; and
receiving, from the UE, measurements related to the first downlink transmission, based at least in part on transmitting the first downlink transmission.