Techniques for spatial domain basis function refinement

A method for wireless communication at a network entity, comprising:

• outputting a first message indicating a configuration for reporting spatial domain basis function updates to the network entity;
• outputting a third message indicating for a user equipment (UE) to report an update for at least a set of spatial domain basis functions;
• obtaining a full channel state information report and a partial channel state information report based at least in part on the indicated configuration, the full channel state information report indicating the at least the set of spatial domain basis functions and the partial channel state information report indicating the update for the at least the set of spatial domain basis functions relative to the full channel state information report or a previous partial channel state information report, wherein obtaining the partial channel state information report is based at least in part on outputting the third message;
• and
• outputting a second message based at least in part on the partial channel state information report.

An apparatus for wireless communication at a user equipment (UE), comprising:

• a processor;
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive, from a network entity, a first message indicating a configuration for reporting spatial domain basis function updates to the network entity;
• receive, from the network entity, a third message indicating for the UE to report an update for at least a set of spatial domain basis functions;
• transmit, to the network entity, a full channel state information report and a partial channel state information report based at least in part on the indicated configuration, the full channel state information report indicating the at least the set of spatial domain basis functions and the partial channel state information report indicating the update for the at least the set of spatial domain basis functions relative to the full channel state information report or a previous partial channel state information report, wherein transmitting the partial channel state information report is based at least in part on receiving the third message;
• and
• receive, from the network entity, a second message based at least in part on the partial channel state information report.

An apparatus for wireless communication at a network entity, comprising:

• a processor;
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• output a first message indicating a configuration for reporting spatial domain basis function updates to the network entity;
• output a third message indicating for a user equipment (UE) to report an update for at least a set of spatial domain basis functions;
• obtain a full channel state information report and a partial channel state information report based at least in part on the indicated configuration, the full channel state information report indicating the at least the set of spatial domain basis functions and the partial channel state information report indicating the update for the at least the set of spatial domain basis functions relative to the full channel state information report or a previous partial channel state information report, wherein obtain the partial channel state information report is based at least in part on outputting the third message;
• and
• output a second message based at least in part on the partial channel state information report.