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

A user equipment (UE) of transmitting channel state information (CSI) in a wireless communication system, the UE comprising:

• at least one transceiver;
• and
• at least one processor connected to the at least one transceiver,
• wherein the at least one processor is configured to:
• receive, from a base station through the at least one transceiver, configuration information related to a plurality of CSI-reference signal (RS) resources;
• receive, from the base station through the at least one transceiver, a CSI-RS based on the plurality of CSI-RS resources;
• and
• transmit, to the base station through the at least one transceiver, the CSI including a specific precoding matrix indicator (PMI) determined based on a plurality of time instances based on the CSI-RS,
• wherein the CSI includes a plurality of channel quality indicators (CQIs) and rank indicators (RIs) in each of the plurality of time instances, and a reference time instance of the CSI among the plurality of time instances.

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

• at least one transceiver;
• and
• at least one processor connected to the at least one transceiver,
• wherein the at least one processor is configured to:
• transmit, to a user equipment (UE) through the at least one transceiver, configuration information related to a plurality of CSI-reference signal (RS) resources;
• transmit, to the UE through the at least one transceiver, a CSI-RS based on the plurality of CSI-RS resources;
• and
• receive, from the UE through the at least one transceiver, the CSI including a specific precoding matrix indicator (PMI) determined based on a plurality of time instances based on the CSI-RS,
• wherein the CSI includes a plurality of channel quality indicators (CQIs) and rank indicators (RIs) in each of the plurality of time instances, and a reference time instance of the CSI among the plurality of time instances.