Method for transmitting and receiving channel state information in wireless communication system, and apparatus therefor

A user equipment (UE) operating in a wireless communication system, the UE comprising:

• one or more transceivers;
• one or more processors;
• and
• one or more memories operatively connectable to the one or more processors,
• wherein when the one or more memories are executed by the one or more processors, the one or more memories store instructions which cause the one or more processors to perform operations,
• wherein the operations include
• receiving configuration information related to reporting of channel state information (CSI);
• receiving a channel state information-reference signal (CSI-RS);
• computing the CSI based on the CSI-RS;
• and
• reporting the CSI, and
• wherein the CSI includes first information for selecting a plurality of antenna ports related to the CSI-RS,
• wherein K antenna ports are selected from P antenna ports related to the CSI-RS, based on the first information, and
• wherein, for each polarization related to the plurality of antenna ports, K/2 antenna ports are selected from P/2 antenna ports related to the CSI-RS based on a combination of P/2 and K/2, and
• wherein a bitwidth for the first information is
• ⌈
• log
• 2
• (
• P
• /
• 2
• K
• /
• 2
• )
• ⌉
• .
• ┌ ┐ is a ceiling function and
• (
• x
• y
• )
• is a combinatorial coefficient C(x, y).

A base station (BS) operating in a wireless communication system, the BS comprising:

• one or more transceivers;
• one or more processors;
• and
• one or more memories operatively connectable to the one or more processors,
• wherein when the one or more memories are executed by the one or more processors, the one or more memories store instructions which cause the one or more processors to perform operations,
• wherein the operations include
• transmitting configuration information related to reporting of channel state information (CSI);
• transmitting a channel state information-reference signal (CSI-RS);
• and
• receiving the CSI,
• wherein the CSI includes first information for selecting a plurality of antenna ports related to the CSI-RS,
• wherein K antenna ports are selected from P antenna ports related to the CSI-RS, based on the first information,
• wherein, for each polarization related to the plurality of antenna ports, K/2 antenna ports are selected from P/2 antenna ports related to the CSI-RS based on a combination of P/2 and K/2, and
• wherein a bitwidth for the first information is
• ⌈
• log
• 2
• (
• P
• /
• 2
• K
• /
• 2
• )
• ⌉
• ,
• ┌ ┐ is a ceiling function and
• (
• x
• y
• )
• is a combinatorial coefficient C(x, y).