Method and apparatus to enable channel compression in advanced wireless communication systems

A base station (BS) for a channel state information (CSI) feedback in a wireless communication system, the BS comprising:

• at least one processor;
• and
• a transceiver operably connected to the at least one processor, the transceiver configured to:
• transmit, to a user equipment (UE), CSI feedback configuration information for the CSI feedback including a spatial channel information (SCI) indicator, wherein the SCI indicator indicates a SCI associated with a downlink (DL) channel matrix;
• and
• receive, from the UE, the CSI feedback including the identified SCI indicator indicating a first set of d basis vectors comprising a dimension K×1, a second set of d basis vectors comprising a dimension N×1, and a set of d coefficients over an uplink channel, where K indicates a number of subbands (SBs) and N indicates a number of components of the SCI.

A method of a user equipment (UE) for a channel state information (CSI) feedback in a wireless communication system, the method comprising:

• receiving, from a base station (BS), CSI feedback configuration information for the CSI feedback including a spatial channel information (SCI) indicator, wherein the SCI indicator indicates a SCI associated with a downlink (DL) channel matrix;
• determine the SCI indicator that indicates a first set of d basis vectors comprising a dimension K×1, a second set of d basis vectors comprising a dimension N×1, and a set of d coefficients, where K indicates a number of subbands (SBs) and N indicates a number of components of the SCI;
• and
• transmitting, to the BS, the CSI feedback including the determined SCI indicator indicating the first set of d basis vectors, the second set of d basis vectors, and the set of d coefficients over an uplink channel.