Techniques for activating a pathloss reference signal
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of an uplink transmission configuration indication (TCI) state. The UE may determine that the uplink TCI state identifies a pathloss reference signal for an associated uplink transmission. The UE may determine an uplink power control parameter for the uplink transmission based at least in part on the pathloss reference signal. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
receiving an indication of an uplink transmission configuration indication (TCI) state in a downlink control information communication,
wherein the indication of the uplink TCI state includes an indication of one or more types of uplink quasi-co-location (QCL) relationships;
identifying that the uplink TCI state includes an indication of a pathloss reference signal for an associated uplink transmission; and
identifying an uplink power control parameter for the associated uplink transmission based at least in part on the pathloss reference signal.
2. The method of claim 1 , further comprising:
performing the associated uplink transmission using the uplink power control parameter.
3. The method of claim 1 , further comprising:
performing the associated uplink transmission in:
a physical uplink control channel resource,
a physical uplink shared channel resource,
a physical random access channel resource, or
a sounding reference signal resource or resource set.
4. The method of claim 1 , further comprising:
receiving an indication of another uplink TCI state;
determining that the other uplink TCI state does not identify another pathloss reference signal; and
identifying the other pathloss reference signal based at least in part on at least one of:
a radio resource control communication,
a medium access control element communication, or
another downlink control information communication.
5. The method of claim 1 , wherein identifying that the uplink TCI state includes the indication of the pathloss reference signal comprises:
identifying, in the downlink control information communication, a field configured to indicate whether the uplink TCI state identifies the pathloss reference signal; and
identifying that the uplink TCI state includes the indication of the pathloss reference signal based at least in part on the field.
6. The method of claim 1 , wherein identifying that the uplink TCI state includes the indication of the pathloss reference signal comprises:
identifying that the uplink TCI state includes the indication of the pathloss reference signal based at least in part on the associated uplink transmission being scheduled.
7. The method of claim 1 , further comprising:
receiving an indication that the uplink TCI state identifies an updated pathloss reference signal that is different from the pathloss reference signal,
wherein the indication that the uplink TCI state identifies the updated pathloss reference signal is received in a different downlink communication from the downlink control information communication.
8. A method of wireless communication performed by a network entity, comprising:
transmitting an indication of an uplink transmission configuration indication (TCI) state in a downlink control information communication,
wherein the indication of the uplink TCI state includes an indication of one or more types of uplink quasi-co-location (QCL) relationships; and
transmitting an associated pathloss reference signal based at least in part on the uplink TCI state,
wherein the uplink TCI state includes an indication of the associated pathloss reference signal.
9. The method of claim 8 , further comprising:
receiving an uplink transmission, that is based at least in part on the associated pathloss reference signal, in:
a physical uplink control channel resource,
a physical uplink shared channel resource,
a physical random access channel resource, or
a sounding reference signal resource or resource set.
10. The method of claim 8 , further comprising:
transmitting the indication of the associated pathloss reference signal in at least one of:
a radio resource control communication,
a medium access control element communication, or
another downlink control information communication.
11. The method of claim 8 , wherein the associated pathloss reference signal is updated based at least in part on an associated uplink transmission.
12. The method of claim 8 ,
wherein the downlink control information communication includes a field configured to indicate whether the uplink TCI state identifies the associated pathloss reference signal.
13. The method of claim 8 , wherein transmitting the indication of the uplink TCI state comprises:
determining to update a pathloss reference signal for an associated uplink transmission; and
transmitting the indication of the uplink TCI state based at least in part on the determination.
14. The method of claim 8 , further comprising:
determining to update the associated pathloss reference signal for an associated uplink transmission; and
transmitting, based at least in part on the determination, an indication of an updated pathloss reference signal in a different downlink communication from the downlink control information communication.
15. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
receive an indication of an uplink transmission configuration indication (TCI) state in a downlink control information communication,
wherein the indication of the uplink TCI state includes an indication of one or more types of uplink quasi-co-location (QCL) relationships;
identify that the uplink TCI state includes an indication of a pathloss reference signal for an associated uplink transmission; and
identify an uplink power control parameter for the associated uplink transmission based at least in part on the pathloss reference signal.
16. The UE of claim 15 , wherein the one or more processors are further configured to:
perform the associated uplink transmission using the uplink power control parameter.
17. The UE of claim 15 , wherein the one or more processors are further configured to:
perform the associated uplink transmission in:
a physical uplink control channel resource,
a physical uplink shared channel resource,
a physical random access channel resource, or
a sounding reference signal resource or resource set.
18. The UE of claim 15 , wherein the one or more processors, when identifying that the uplink TCI state includes the indication of the pathloss reference signal, are configured to:
identify, in the downlink control information communication, a field configured to indicate whether the uplink TCI state identifies the pathloss reference signal; and
identify that the uplink TCI state includes the indication of the pathloss reference signal based at least in part on the field.
19. The UE of claim 15 , wherein the one or more processors are further configured to:
receive an indication that the uplink TCI state identifies an updated pathloss reference signal that is different from the pathloss reference signal,
wherein the indication that the uplink TCI state identifies the updated pathloss reference signal is received in a different downlink communication from the downlink control information communication.
20. The UE of claim 15 , wherein the one or more processors are further configured to:
receive an indication of another uplink TCI state;
determine that the other uplink TCI state does not identify another pathloss reference signal; and
identify the other pathloss reference signal based at least in part on at least one of:
a radio resource control communication,
a medium access control element communication, or
another downlink control information communication.
21. The UE of claim 15 , wherein the one or more processors, when identifying that the uplink TCI state includes the indication of the pathloss reference signal, are configured to:
identify that the uplink TCI state includes the indication of the pathloss reference signal based at least in part on the associated uplink transmission being scheduled.
22. A network entity for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
transmit an indication of an uplink transmission configuration indication (TCI) state in a downlink control information communication,
wherein the indication of the uplink TCI state includes an indication of one or more types of uplink quasi-co-location (QCL) relationships; and
transmit an associated pathloss reference signal based at least in part on the uplink TCI state,
wherein the uplink TCI state includes an indication of the associated pathloss reference signal.
23. The network entity of claim 22 , wherein the one or more processors are further configured to:
receive an uplink transmission, that is based at least in part on the associated pathloss reference signal, in:
a physical uplink control channel resource,
a physical uplink shared channel resource,
a physical random access channel resource, or
a sounding reference signal resource or resource set.
24. The network entity of claim 22 ,
wherein the downlink control information communication includes a field configured to indicate whether the uplink TCI state identifies the associated pathloss reference signal.
25. The network entity of claim 22 , wherein the one or more processors, when transmitting the indication of the uplink TCI state, are configured to:
determine to update a pathloss reference signal for an associated uplink transmission; and
transmit the indication of the uplink TCI state based at least in part on the determination.
26. The network entity of claim 22 , wherein the one or more processors are further configured to:
determine to update the associated pathloss reference signal for an associated uplink transmission; and
transmit, based at least in part on the determination, an indication of an updated pathloss reference signal in a different downlink communication from the downlink control information communication.
27. The network entity of claim 22 , wherein the one or more processors are further configured to:
transmit the indication of the associated pathloss reference signal in at least one of:
a radio resource control communication,
a medium access control element communication, or
another downlink control information communication.
28. The network entity of claim 22 , wherein the associated pathloss reference signal is updated based at least in part on an associated uplink transmission.