Beam combining based channel state information (csi) feedback

An apparatus comprising:

• one or more processors configured to cause of a base station (BS) operating in a 5G network to:
• encode a radio resource control (RRC) configuration message, the RRC configuration message including first configuration information to configure determination of channel quality information (CQI), a rank indicator (RI), and a precoding matrix indicator (PMI) for channel state information (CSI) reporting by a user equipment (LIE);
• encode second configuration information for transmission to the UE, the second configuration information to configure codebook parameters for a high spatial resolution codebook associated with the PMI;
• and
• decode CSI received from the UE, the CSI including the RI and the PMI, wherein the PMI is based on a precoding matrix determined based on the first configuration information and a number of coefficients in at least one coefficient vector of the precoding matrix is configured using the second configuration information.

A user equipment (UE) comprising:

• one or more memory mediums storing program instructions;
• and
• one or more processors, the instructions to configure the one or more processors for performing channel state information (CSI) reporting in a 5G network and to cause the UE to:
• decode a radio resource control (RRC) configuration message, the RRC configuration message including first configuration information to configure determination of channel quality information (CQI), a rank indicator (RI), and a precoding matrix indicator (PMI) for the CSI reporting;
• decode second configuration information to configure codebook parameters for a high spatial resolution codebook associated with the PMI;
• determine a precoding matrix based on the first configuration information, wherein a number of coefficients in at least one coefficient vector of the precoding matrix is configured using the second configuration information;
• and
• encode CSI for transmission to a base station, the CSI including the RI and the PMI associated with the determined precoding matrix.