Abstract: The disclosure relates to a fifth generation (5G) communication system or a sixth generation (6G) communication system for supporting higher data rates beyond a fourth generation (4G) communication system. A method of a base station in a wireless communication system includes transmitting, to a user equipment (UE), channel state information (CSI) report configuration information including configuration information configuring the UE to report precoding matrix index (PMI) quality information (PQI), transmitting a CSI-reference signal (CSI-RS) to the UE, and receiving, from the UE, a CSI and the PQI determined based on the CSI report configuration information and the CSI-RS.

Abstract: The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond a 4G communication system such as LTE. A method by a base station comprises: determining a number of first dimensional beam groups and a number of second dimensional beam groups for reporting at least one PMI-related parameter for a plurality of two-dimensional beams; transmitting a RRC configuration message including information about the number of the first dimensional beam groups and the number of the second dimensional beam groups; and receiving reporting of the PMI-related parameter based on the RRC configuration message.

Abstract: A method for transmitting/receiving signals by a UE based on a codebook in a multi-antenna wireless communication system according to an aspect of the present invention includes: receiving a channel state information reference signal (CSI-RS) from a base station through multiple antenna ports; and reporting channel state information to the base station, wherein the channel state information includes a precoding matrix indicator (PMI) for indicating a specific code vector among a plurality of code vectors included in the codebook, wherein elements included in each code vector included in the codebook are selected from elements of a predetermined circular vector using an azimuth angle of the UE with respect to the base station and an oversampling factor.

Abstract: A method for transmitting/receiving signals by a UE based on a codebook in a multi-antenna wireless communication system according to an aspect of the present invention includes: receiving a channel state information reference signal (CSI-RS) from a base station through multiple antenna ports; and reporting channel state information to the base station, wherein the channel state information includes a precoding matrix indicator (PMI) for indicating a specific code vector among a plurality of code vectors included in the codebook, wherein elements included in each code vector included in the codebook are selected from elements of a predetermined circular vector using an azimuth angle of the UE with respect to the base station and an oversampling factor.