Subband-specific codebook subset restriction

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 a first configuration of one or more channel state information reference signal resources;
• receive a second configuration of a channel state information report associated with the one or more channel state information reference signal resources, the second configuration comprising at least one of an indication of a codebook, a plurality of codebook restriction sets, and a configured bandwidth;
• identify a mapping between one or more frequency-domain subbands of the configured bandwidth and each codebook restriction set of the plurality of codebook restriction sets;
• and
• transmit, to the base station, a report indicating one or more precoding matrix indicators from the codebook for each of the one or more frequency-domain subbands based at least in part on the mapping.

An apparatus for wireless communication at a base station, comprising:

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• transmit a first configuration of one or more channel state information reference signal resources;
• transmit a second configuration of a channel state information report associated with the one or more channel state information reference signal resources, the second configuration comprising at least one of an indication of a codebook, a plurality of codebook restriction sets, and a configured bandwidth;
• identify a mapping between one or more frequency-domain subbands of the configured bandwidth and each codebook restriction set of the plurality of codebook restriction sets;
• and
• receive, from a user equipment (UE), a report indicating one or more precoding matrix indicators from the codebook for each of the one or more frequency-domain subbands based at least in part on the mapping.