Method and apparatus for channel state information (CSI) reporting

A base station (BS) comprising:

• a transceiver;
• and
• a processor operably connected to the transceiver, the processor configured to:
• generate a plurality of precoding codebook parameters, the plurality of precoding codebook parameters including a number of rows and columns of a codebook;
• cause the transceiver to transmit, to a user equipment (UE), configuration information for channel state information (CSI) reporting and the plurality of precoding codebook parameters, including the number of rows and columns;
• and
• receive a CSI report from the UE generated responsive to the transmitted configuration information transmitted from the BS including codebook indices from first and second precoding matrix indicators (PMIs),
• wherein the first PMI includes a codebook index when one of the number of rows and columns of the codebook equals one, and
• wherein the first PMI includes two codebook indices when each of the number of rows and columns of the codebook is greater than one.

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

• receiving, by the UE, configuration information for a channel state information (CSI) reporting,
• wherein the configuration information includes a plurality of precoding codebook parameters, the plurality of precoding codebook parameters including a number of rows and columns of a codebook;
• and
• in response to receipt of the configuration information for the CSI reporting and the plurality of precoding codebook parameters including the number of rows and columns, determining, by the UE, a first precoding matrix indicator (PMI) and a second PMI,
• wherein the first PMI includes one codebook index when one of the number of rows and columns of the codebook equals one,
• wherein the first PMI includes two codebook indices when each of the number of rows and columns of the codebook is greater than one, and
• transmitting, by the UE, the CSI reporting on an uplink channel, the CSI reporting including the determined first and second PMIs.