CSI feedback overhead reduction for FD-MIMO

An apparatus configured for wireless communication, the apparatus comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor,
• wherein the at least one processor is configured to:
• receive an indication to report subband channel quality and precoding feedback for a plurality of subbands over a carrier bandwidth;
• select a subset of the plurality of subbands for reporting the subband channel quality and precoding feedback;
• transmit the subband channel quality and precoding feedback for each of the subbands in the subset, wherein the subset includes at least one subband selected from each bandwidth part of a plurality of bandwidth parts comprising the carrier bandwidth;
• and
• transmit a subband selection indicator to indicate a location of the subset of the plurality of subbands.

A non-transitory computer-readable medium having program code recorded thereon, the program code executable by a computer for causing the computer to:

• receive, at a user equipment (UE), an indication to report subband channel quality and precoding feedback for a plurality of subbands over a carrier bandwidth;
• select, at the UE, a subset of the plurality of subbands for reporting the subband channel quality and precoding feedback;
• transmit, by the UE, the subband channel quality and precoding feedback for each of the subbands in the subset, wherein the subset includes at least one subband selected from each bandwidth part of a plurality of bandwidth parts comprising the carrier bandwidth;
• and
• transmit, by the UE, a subband selection indicator to indicate a location of the subset of the plurality of subbands.