Default beam selection based on a subset of coresets
In order to overcome problems that a UE may face in determining a default beam for communication with the base station during a COT, a method, apparatus, and computer-readable medium are provided for a base station to indicate to the UE which CORESET(s), QCL assumptions, UL resources, and/or spatial relationships are selected for a COT. A UE receives, from a base station, an indication corresponding to a COT. The indication is for at least one of a set of CORESETs, a set of QCL assumptions, a set of UL resources, or a set of spatial relations for determining a default beam. The UE determines the default beam from the base station for use during the COT based on the indication. The UE transmits or receives a transmission using the default beam.
1. A method of wireless communication at a User Equipment (UE), comprising:
receiving, from a base station, an indication corresponding to a Channel Occupancy Time (COT), wherein the indication is for at least one of a set of Control Resource Sets (CORESETs), a set of Quasi co-location (QCL) assumptions, a set of uplink resources, or a set of spatial relations for determining a default beam;
determining the default beam from the base station for use during the COT based on the indication; and
transmitting or receiving a transmission using the default beam.
2. The method of claim 1 , wherein the default beam comprises a default reception beam that is selected based on a lowest CORESET identifier (ID) from among the set of CORESETs or the set of QCL assumptions.
3. The method of claim 1 , wherein for a CORESET that is not comprised in the set of CORESETs, the UE determines the default beam based on a lowest CORESET identifier (ID) from among the set of CORESETs or the set of QCL assumptions.
4. The method of claim 1 , wherein the default beam comprises a default transmission beam that is selected based on the indication of the set of uplink resources or the set of spatial relations for determining the default beam.
5. The method of claim 4 , wherein the set of uplink resources correspond to at least one of a Sounding Reference Signal (SRS), an uplink control channel, or an uplink data channel.
6. The method of claim 4 , wherein the set of spatial relations for determining the default beam comprise spatial relations for selecting at least one of a Sounding Reference Signal (SRS), an uplink control channel, or an uplink data channel for an uplink transmission from the UE.
7. The method of claim 4 , wherein the indication comprises uplink resources for a first uplink channel, and wherein the UE determines the default beam for a second uplink channel based on a beam used for the first uplink channel.
8. An apparatus for wireless communication at a User Equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive, from a base station, an indication corresponding to a Channel Occupancy Time (COT), wherein the indication is for at least one of a set of Control Resource Sets (CORESETs), a set of Quasi co-location (QCL) assumptions, a set of uplink resources, or a set of spatial relations for determining a default beam;
determine the default beam from the base station for use during the COT based on the indication; and
transmit or receive a transmission using the default beam.
9. The apparatus of claim 8 , wherein the default beam comprises a default reception beam that is selected based on a lowest CORESET identifier (ID) from among the set of CORESETs or the set of QCL assumptions.
10. The apparatus of claim 8 , wherein for a CORESET that is not comprised in the set of CORESETs, the UE determines the default beam based on a lowest CORESET identifier (ID) from among the set of CORESETs or the set of QCL assumptions.
11. The apparatus of claim 8 , wherein the default beam comprises a default transmission beam that is selected based on the indication of the set of uplink resources or the set of spatial relations for determining the default beam.
12. The apparatus of claim 11 , wherein the set of uplink resources correspond to at least one of a Sounding Reference Signal (SRS), an uplink control channel, or an uplink data channel.
13. The apparatus of claim 11 , wherein the set of spatial relations for determining the default beam comprise spatial relations for selecting at least one of a Sounding Reference Signal (SRS), an uplink control channel, or an uplink data channel for an uplink transmission from the UE.
14. The apparatus of claim 11 , wherein the indication comprises uplink resources for a first uplink channel, and wherein the UE determines the default beam for a second uplink channel based on a beam used for the first uplink channel.
15. A method of wireless communication at a base station, comprising:
sending, to a UE, an indication of at least one of a set of Control Resource Sets (CORESETs), a set of Quasi co-location (QCL) assumptions, a set of uplink resources, or a set of spatial relations for determining a default beam, the indication being for use in determining the default beam for use in a Channel Occupancy Time (COT); and
transmitting or receiving a transmission based on the default beam.
16. The method of claim 15 , wherein the indication indicates the set of CORESETs, and wherein the default beam is a default reception beam.
17. The method of claim 15 , wherein the indication indicates the set of QCL assumptions, and wherein the default beam is a default reception beam.
18. The method of claim 15 , wherein the indication indicates the set of uplink resources, and wherein the default beam comprises a default transmission beam.
19. The method of claim 18 , wherein the set of uplink resources comprise at least one of a Sounding Reference Signal (SRS), an uplink control channel, or an uplink data channel.
20. The method of claim 15 , wherein the indication indicates the set of spatial relations for determining the default beam, and wherein the default beam comprises a default transmission beam.
21. The method of claim 20 , wherein the set of spatial relations for determining the default beam comprise spatial relations for selecting at least one of a Sounding Reference Signal (SRS), an uplink control channel, or an uplink data channel.
22. The method of claim 15 , wherein the indication comprises uplink resources for a first uplink channel, and wherein the default beam for a second uplink channel is indicated based on a beam used for the first uplink channel.
23. An apparatus for wireless communication at a base station, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
send, to a User Equipment (UE), an indication of at least one of a set of Control Resource Sets (CORESETs), a set of Quasi co-location (QCL) assumptions, a set of uplink resources, or a set of spatial relations for determining a default beam, the indication being for use in determining the default beam for use in a Channel Occupancy Time (COT); and
transmit or receive a transmission based on the default beam.
24. The apparatus of claim 23 , wherein the indication indicates the set of CORESETs, and wherein the default beam is a default reception beam.
25. The apparatus of claim 23 , wherein the indication indicates the set of QCL assumptions, and wherein the default beam is a default reception beam.
26. The apparatus of claim 23 , wherein the indication indicates the set of uplink resources, and wherein the default beam comprises a default transmission beam.
27. The apparatus of claim 26 , wherein the set of uplink resources comprise at least one of a Sounding Reference Signal (SRS), an uplink control channel, or an uplink data channel.
28. The apparatus of claim 23 , wherein the indication indicates the set of spatial relations for determining the default beam, and wherein the default beam comprises a default transmission beam.
29. The apparatus of claim 28 , wherein the set of spatial relations for determining the default beam comprise spatial relations for selecting at least one of a Sounding Reference Signal (SRS), an uplink control channel, or an uplink data channel.
30. The apparatus of claim 23 , wherein the indication comprises uplink resources for a first uplink channel, and wherein the default beam for a second uplink channel is indicated based on a beam used for the first uplink channel.