Indicating transmission configuration indicator state based on aperiodic channel state information reference signal

A user equipment (UE) for wireless communication, comprising:

• memory;
• and
• one or more processors coupled to the memory, the memory comprising instructions executable by the one or more processors to cause the UE to:
• receive a configuration that configures transmission configuration indicator (TCI) states based at least in part on aperiodic channel state information reference signals (AP-CSI-RSs), wherein each TCI state includes a first resource that is an aperiodic tracking reference signal (AP-TRS) and a second resource that is an AP-CSI-RS;
• receive first downlink control information (DCI) that triggers a first AP-CSI-RS resource set that includes AP-CSI-RSs that are each associated with a quasi-co-location (QCL) Type-D resource, wherein the QCL Type-D resource is a TRS or a synchronization signal block (SSB);
• select one or more AP-CSI-RSs based at least in part on AP-CSI-RS measurements;
• transmit a report that indicates the one or more AP-CSI-RSs;
• receive an activation command that activates a TCI state associated with a first narrow beam, wherein a combination of a first AP-CSI-RS and a first associated QCL Type-D resource uniquely indicates the first narrow beam;
• and
• transmit or receive a reference signal using the TCI state.

A method of wireless communication performed by a network entity, comprising:

• transmitting a configuration that configures transmission configuration indicator (TCI) states based at least in part on aperiodic channel state information reference signals (AP-CSI-RSs), wherein each TCI state includes a first resource that comprises an aperiodic tracking reference signal (AP-TRS) and a second resource that comprises an AP-CSI-RS;
• transmitting first downlink control information (DCI) that triggers a first AP-CSI-RS resource set that includes AP-CSI-RSs that are each associated with a quasi-co-location (QCL) Type-D resource, wherein the QCL Type-D resource comprises a TRS or a synchronization signal block (SSB);
• receiving a report of one or more AP-CSI-RSs;
• selecting a first AP-CSI-RS from among the one or more AP-CSI-RSs, wherein a combination of the first AP-CSI-RS and a first associated QCL Type-D resource uniquely indicates a first narrow beam;
• transmitting an activation command that activates a TCI state associated with the first narrow beam;
• and
• transmitting or receiving a reference signal using the TCI state.

A method of wireless communication performed by a user equipment (UE), comprising:

• receiving a configuration that configures transmission configuration indicator (TCI) states based at least in part on aperiodic channel state information reference signals (AP-CSI-RSs), wherein each TCI state includes a first resource that is an aperiodic tracking reference signal (AP-TRS) and a second resource that is an AP-CSI-RS;
• receiving first downlink control information (DCI) that triggers a first AP-CSI-RS resource set that includes AP-CSI-RSs that are each associated with a quasi-co-location (QCL) Type-D resource, wherein the QCL Type-D resource is a TRS or a synchronization signal block (SSB);
• selecting one or more AP-CSI-RSs based at least in part on AP-CSI-RS measurements;
• transmitting a report that indicates the one or more AP-CSI-RSs;
• receiving an activation command that activates a TCI state associated with a first narrow beam, wherein a combination of a first AP-CSI-RS and a first associated QCL Type-D resource uniquely indicates the first narrow beam;
• and
• transmitting or receiving a reference signal using the TCI state.