Beam selection for communication in a multi-transmit-receive point deployment
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a set of beams, for which a corresponding uplink beam indication is not configured, associated with a set of transmit-receive points (TRPs) based at least in part on at least one of a downlink control information (DCI) configuration, a transmission configuration indicator (TCI) codepoint mapping, a control resource set (CORESET) configuration, or a TRP index, wherein the set of beams includes a sounding reference signal (SRS) beam or a physical uplink control channel (PUCCH) beam. The UE may communicate with the set of TRPs using the set of beams based at least in part on determining the set of beams. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
determining a set of beams, for which a corresponding uplink beam indication is not configured, associated with a set of transmit-receive points (TRPs) based at least in part on at least one of:
a first value, associated with a first beam of the set of beams, of a transmission configuration indicator (TCI) codepoint mapping and a second value, associated with a second beam of the set of beams, of the TCI codepoint mapping when the UE is operating in a single downlink control information (DCI) configuration for the set of TRPs,
a TCI state of a control resource set (CORESET) having a same index value as a TRP, of the set of TRPs, when the UE is operating in a multi-DCI configuration for the set of TRPs,
a TCI state of a physical downlink shared channel (PDSCH) beam with a same TRP index as the TRP when the multi-DCI configuration is determined, or
a physical uplink control channel (PUCCH) resource with the same TRP index as the TRP and with a configured corresponding uplink beam indication when the multi-DCI configuration is determined; and
communicating with the set of TRPs using the set of beams based at least in part on determining the set of beams.
2. The method of claim 1 , wherein the set of beams includes a pathloss reference signal.
3. The method of claim 1 , wherein the corresponding uplink beam indication includes a spatial relationship or an uplink transmission configuration indicator state.
4. The method of claim 1 , further comprising:
determining the single DCI configuration for the set of TRPs,
wherein the TRP is a first TRP, and
wherein determining the set of beams comprises:
determining, based at least in part on the single DCI configuration, the first beam for the first TRP based at least in part on the first value of the TCI codepoint mapping; and
determining, based at least in part on the single DCI configuration, the second beam for a second TRP, of the set of TRPs, based at least in part on the second value of the TCI codepoint mapping.
5. The method of claim 1 , further comprising:
determining the multi-DCI configuration for the set of TRPs,
wherein determining the set of beams comprises:
determining, for the TRP and based at least in part on determining the multi-DCI configuration, the first beam based at least in part on the first beam being associated with the TCI state of the CORESET having the same index value as the TRP.
6. The method of claim 1 , further comprising:
determining the multi-DCI configuration for the set of TRPs,
wherein determining the set of beams comprises:
determining, for the TRP and based at least in part on determining the multi-DCI configuration, the first beam used to receive a PDSCH from the same index value as the TRP.
7. The method of claim 6 , wherein the first beam is determined based at least in part on a scheduling offset between a scheduling PDCCH and a scheduled PDSCH being less than a beam switch latency threshold.
8. The method of claim 1 , further comprising:
determining the multi-DCI configuration for the set of TRPs,
wherein determining the set of beams comprises:
determining, for the TRP and based at least in part on determining the multi-DCI configuration, the first beam based at least in part on the TCI state of the PDSCH beam with the same TRP index as the TRP.
9. The method of claim 1 , further comprising:
determining the multi-DCI configuration for the set of TRPs,
wherein determining the set of beams comprises:
determining, for the TRP and based at least in part on determining the multi-DCI configuration, the first beam used for the PUCCH resource with the same TRP index as the TRP and with the configured corresponding uplink beam indication.
10. The method of claim 1 , wherein determining the set of beams comprises:
determining, for the TRP, the first beam based at least in part on a corresponding beam for receiving a PDSCH.
11. The method of claim 10 , wherein the first beam is determined based at least in part on a scheduling offset between a scheduling PDCCH and a scheduled PDSCH being less than a beam switch latency threshold.
12. The method of claim 1 ,
wherein determining the set of beams comprises:
determining, for the TRP, the first beam based at least in part on an active TCI state of the CORESET.
13. The method of claim 1 , wherein determining the set of beams comprises:
determining, for the TRP, the first beam based at least in part on a TCI state of a scheduling PDCCH associated with scheduling an aperiodic sounding reference signal.
14. The method of claim 1 , wherein determining the set of beams comprises:
determining, for the TRP, the first beam based at least in part on the PDSCH beam for the aperiodic sounding reference signal or the PUCCH that is not scheduled by the PDCCH.
15. The method of claim 14 , wherein the first beam is determined based at least in part on a scheduling offset between a scheduling PDCCH and a scheduled PDSCH being less than a beam switch latency threshold.
16. The method of claim 1 , wherein determining the set of beams comprises:
determining, for the TRP, the first beam based at least in part on a quasi-co-location assumption of a CORESET.
17. The method of claim 1 , wherein determining the set of beams comprises:
determining, for the TRP, the first beam based at least in part on a pathloss reference signal.
18. The method of claim 1 , wherein determining the set of beams comprises:
determining, for the TRP, the first beam based at least in part on an active TCI state of a CORESET that is configured on a cell of the beam.
19. The method of claim 1 , wherein determining the set of beams comprises:
determining, for the TRP, the first beam based at least in part on an active PDSCH TCI state for a cell of the beam.
20. The method of claim 19 , wherein the cell does not have a CORESET configuration.
21. The method of claim 1 , wherein determining the set of beams comprises:
determining, for the TRP, the first beam based at least in part on a medium access control (MAC) control element selection.
22. The method of claim 1 , wherein determining the set of beams comprises:
determining, for the TRP, the first beam based at least in part on an active TCI state of a PDSCH or a medium access control (MAC) selection.
23. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the one or more processors configured to:
determine a set of beams, for which a corresponding uplink beam indication is not configured, associated with a set of transmit-receive points (TRPs) based at least in part on at least one of:
a first value, associated with a first beam of the set of beams, of a transmission configuration indicator (TCI) codepoint mapping and a second value, associated with a second beam of the set of beams, of the TCI codepoint mapping when the UE is operating in a single downlink control information (DCI) configuration for the set of TRPs,
a TCI state of a control resource set (CORESET) having a same index value as a TRP, of the set of TRPs, when the UE is operating in a multi-DCI configuration for the set of TRPs,
a TCI state of a physical downlink shared channel (PDSCH) beam with a same TRP index as the TRP when the multi-DCI configuration is determined, or
a physical uplink control channel (PUCCH) resource with the same TRP index as the TRP and with a configured corresponding uplink beam indication when the multi-DCI configuration is determined; and
communicate with the set of TRPs using the set of beams based at least in part on determining the set of beams.
24. The UE of claim 23 , wherein the set of beams includes a pathloss reference signal.
25. The UE of claim 23 , wherein the corresponding uplink beam indication includes a spatial relationship or an uplink transmission configuration indicator state.
26. The UE of claim 23 ,
wherein the TRP is a first TRP, and
wherein the one or more processors are further configured to:
determine the single DCI configuration for the set of TRPs, and wherein the one or more processors, to determine the set of beams, are configured to:
determine, based at least in part on the single DCI configuration, the first beam for the first TRP based at least in part on the first value of the TCI codepoint mapping; and
determine, based at least in part on the single DCI configuration the second beam for a second TRP, of the set of TRPs, based at least in part on the second value of the TCI codepoint mapping.
27. The UE of claim 23 , wherein the one or more processors are further configured to:
determine the multi-DCI configuration for the set of TRPs; and
wherein the one or more processors, to determine the set of beams, are configured to:
determine, for the TRP and based at least in part on determining the multi-DCI configuration, the first beam based at least in part on the first beam being associated with the TCI state of the CORESET having the same index value as the TRP.
28. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to:
determine a set of beams, for which a corresponding uplink beam indication is not configured, associated with a set of transmit-receive points (TRPs) based at least in part on at least one of:
a first value, associated with a first beam of the set of beams, of a transmission configuration indicator (TCI) codepoint mapping and a second value, associated with a second beam of the set of beams, of the TCI codepoint mapping when the UE is operating in a single downlink control information (DCI) configuration for the set of TRPs,
a TCI state of a control resource set (CORESET) having a same index value as a TRP, of the set of TRPs, when the UE is operating in a multi-DCI configuration for the set of TRPs,
a TCI state of a physical downlink shared channel (PDSCH) beam with a same TRP index as the TRP when the multi-DCI configuration is determined, or
a physical uplink control channel (PUCCH) resource with the same TRP index as the TRP and with a configured corresponding uplink beam indication when the multi-DCI configuration is determined; and
communicate with the set of TRPs using the set of beams based at least in part on determining the set of beams.
29. An apparatus for wireless communication, comprising:
means for determining a set of beams, for which a corresponding uplink beam indication is not configured, associated with a set of transmit-receive points (TRPs) based at least in part on at least one of:
a first value, associated with a first beam of the set of beams, of a transmission configuration indicator (TCI) codepoint mapping and a second value, associated with a second beam of the set of beams, of the TCI codepoint mapping when the apparatus is operating in a single downlink control information (DCI) configuration for the set of TRPs,
a TCI state of a control resource set (CORESET) having a same index value as a TRP, of the set of TRPs, when the apparatus is operating in a multi-DCI configuration for the set of TRPs,
a TCI state of a physical downlink shared channel (PDSCH) beam with a same TRP index as the TRP when the multi-DCI configuration is determined, or
a physical uplink control channel (PUCCH) resource with the same TRP index as the TRP and with a configured corresponding uplink beam indication when the multi-DCI configuration is determined; and
means for communicating with the set of TRPs using the set of beams based at least in part on determining the set of beams.
30. The UE of claim 23 , wherein the one or more processors are further configured to:
determine the multi-DCI configuration for the set of TRPs; and
wherein the one or more processors, to determine the set of beams, are configured to:
determine, for the TRP and based at least in part on determining the multi-DCI configuration, the first beam based at least in part on the TCI state of the PDSCH beam with the same TRP index as the TRP.