Coefficients report for compressed csi feedback

A method for wireless communication by a base station (BS), comprising:

• sending a channel state information (CSI) report configuration, configuring a user equipment (UE) for reporting at least a subset of precoding matrix information including, a plurality of selected beams, a frequency domain compression matrix for each of the beams at each of a plurality of taps in the time domain, and a subset of a plurality of linear combination coefficients associated with the frequency domain compression matrices and beams;
• receiving a reported first evaluation from the UE, wherein the first evaluation is, for each beam, an evaluation of the amplitude of the linear combination coefficients across the taps;
• receiving a reported second evaluation from the UE, wherein the second evaluation is, for each tap, an evaluation of the amplitude of the linear combination coefficients across the beams;
• and
• determining the subset of linear combination coefficients based at least in part on the reported first evaluation and the second evaluation.

An apparatus for wireless communication, comprising:

• a receiver configured to receive a channel state information (CSI) report configuration, configuring the apparatus for reporting at least a subset of precoding matrix information including, a plurality of selected beams, a frequency domain compression matrix for each of the beams at each of a plurality of taps in the time domain, and a subset of a plurality of linear combination coefficients associated with the frequency domain compression matrices and beams;
• at least one processor coupled with a memory and configured to determine the subset of linear combination coefficients based on a first evaluation and a second evaluation, wherein the first evaluation is, for each beam, an evaluation of the amplitude of the linear combination coefficients across the taps, and wherein the second evaluation is, for each tap, an evaluation of the amplitude of the linear combination coefficients across the beams;
• and
• a transmitter configured to report the first evaluation and the second evaluation.

An apparatus for wireless communication, comprising:

• a transmitter configured to send a channel state information (CSI) report configuration, configuring another apparatus for reporting at least a subset of precoding matrix information including, a plurality of selected beams, a frequency domain compression matrix for each of the beams at each of a plurality of taps in the time domain, and a subset of a plurality of linear combination coefficients associated with the frequency domain compression matrices and beams;
• a receiver configured to:
• receive a reported first evaluation from the other apparatus, wherein the first evaluation is, for each beam, an evaluation of the amplitude of the linear combination coefficients across the taps;
• and
• receive a reported second evaluation from the other apparatus, wherein the second evaluation is, for each tap, an evaluation of the amplitude of the linear combination coefficients across the beams;
• and
• at least one processor coupled with a memory and configured to determine the subset of linear combination coefficients based at least in part on the reported first evaluation and the second evaluation.