Method for reporting channel state information in wireless communication system, and device for same

A user equipment (UE) configured to operate in a wireless communication system, the UE comprising:

• a radio frequency (RF) module for transmitting and receiving radio signals;
• and
• a processor for controlling the RF module, wherein the processor configured to:
• receive, from a base station, configuration information including parameter information,
• wherein a plurality of codebook parameters are determined based on the parameter information;
• receive, from the base station, a Channel State Information (CSI)-Reference Signal (RS);
• and
• report, to the base station, CSI computed based on the CSI-RS,
• wherein the CSI includes a precoding matrix indicator (PMI) based on (i) first information related to beams and (ii) second information related to coefficients,
• wherein a bitwidth related to the PMI is determined based on a number of the coefficients, and
• wherein the number of the coefficients is determined based on the plurality of codebook parameters including (i) a first parameter for determining a number of the beams, (ii) a second parameter for determining a number of subbands in which the CSI is reported, and (iii) a third parameter for determining a maximum number of co-efficients for each layer.

A base station configured to operate in a wireless communication system, the base station comprising:

• a radio frequency (RF) module for transmitting and receiving radio signals;
• and
• a processor for controlling the RF module, wherein the processor configured to:
• transmit, to a user equipment (UE), configuration information including parameter information,
• wherein a plurality of codebook parameters are determined based on the parameter information;
• transmit, to the UE, a Channel State Information (CSI)-Reference Signal (RS);
• and
• receive, from the UE, CSI computed based on the CSI-RS,
• wherein the CSI includes a precoding matrix indicator (PMI) based on (i) first information related to beams and (ii) second information related to coefficients,
• wherein a bitwidth related to the PMI is determined based on a number of the coefficients, and
• wherein the number of the coefficients is determined based on the plurality of codebook parameters including (i) a first parameter for determining a number of the beams, (ii) a second parameter for determining a number of subbands in which the CSI is reported, and (iii) a third parameter for determining a maximum number of co-efficients for each layer.