Method and device for transmitting/receiving channel state information in wireless communication system

A user equipment (UE) for performing downlink reception or uplink transmission in a wireless communication system, the UE comprising:

• at least one transceiver;
• and
• at least one processor coupled with the at least one transceiver,
• wherein the at least one processor is configured to:
• receive configuration information related to CSI reporting;
• receive a CSI-RS on at least one CSI-reference signal (RS) resource corresponding to the configuration information;
• and
• transmit CSI based on the at least one CSI-RS and the configuration information,
• wherein, based a specific CSI-RS resource among the at least one CSI-RS resource being configured as one channel measurement resource (CMR), CSI for the one CMR is calculated based on a first port group and a second port group of the specific CSI-RS resource, and
• wherein the first port group and the second port group are associated with a first spatial parameter and a second spatial parameter, respectively.

A base station for receiving channel state information (CSI) in a wireless communication system, the BS comprising:

• at least one transceiver;
• and
• at least one processor coupled with the at least one transceiver,
• wherein the at least one processor is configured to:
• transmit configuration information related to CSI reporting;
• transmit a CSI-RS on at least one CSI-reference signal (RS) resource corresponding to the configuration information;
• and
• receive CSI based on the at least one CSI-RS and the configuration information,
• wherein, based a specific CSI-RS resource among the at least one CSI-RS resource being configured as one channel measurement resource (CMR), CSI for the one CMR is calculated based on a first port group and a second port group of the specific CSI-RS resource, and
• wherein the first port group and the second port group are associated with a first spatial parameter and a second spatial parameter, respectively.