Method and apparatus to enable CSI reporting in wireless communication systems

A base station (BS) comprising:

• a processor configured to:
• generate a configuration, the configuration including information about a set of N basis vectors;
• and
• a transceiver operably coupled to the processor, the transceiver configured to:
• transmit the configuration;
• and
• receive a channel state information (CSI) report including, for each layer l, an indicator indicating M selected basis vectors,
• wherein the M selected basis vectors are selected, for each layer l, from the set of N basis vectors,
• wherein M and N are integers and M<N, and
• wherein l∈{1, . . . , v}, where v is a number of layers the CSI report corresponds to.

A method for operating a user equipment (UE), the method comprising:

• receiving a configuration, the configuration including information about a set of N basis vectors;
• identifying the set of N basis vectors;
• selecting, for each layer l, M basis vectors from the set of N basis vectors;
• determining a channel state information (CSI) report including, for each layer l, an indicator indicating the selected M basis vectors;
• and
• transmitting the CSI report including, for each layer l, the indicator indicating the selected M basis vectors,
• wherein M and N are integers and M<N, and
• wherein l∈{1, . . . , v}, where v is a number of layers the CSI report corresponds to.