Method for transmitting and receiving csi in wireless communication system, and device therefor

A user equipment (UE) configured to transmit channel state information (CSI) in a wireless communication system, the UE comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one memory operably connected to the at least one processor,
• wherein the at least one memory is configured to store instructions performing operations based on being executed by the at least one processor,
• wherein the operations comprise:
• receiving CSI resource configuration related information from a base station (BS),
• wherein the CSI resource configuration related information includes information for one or more channel state information-reference signal (CSI-RS) resource sets, and at least one CSI-RS resource included in the one or more CSI-RS resource sets is configured to be applied with a joint transmission configuration indication (TCI) state;
• receiving, from the BS, mapping information on a mapping between the at least one CSI-RS resource and a channel or an RS for the joint TCI state;
• changing a first QCL RS of a TCI state for the at least one CSI-RS resource to a second QCL RS of a TCI state of the channel or the RS;
• receiving, from the BS, at least one CSI-RS related to the at least one CSI-RS resource based on the second QCL RS;
• and
• transmitting the CSI to the BS based on the at least one CSI-RS.

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

• transmitting CSI resource configuration related information to a user equipment (UE),
• wherein the CSI resource configuration related information includes information for one or more channel state information-reference signal (CSI-RS) resource sets, and at least one CSI-RS resource included in the one or more CSI-RS resource sets is configured to be applied with a joint transmission configuration indication (TCI) state;
• transmitting, to the UE, mapping information on a mapping between the at least one CSI-RS resource and a channel or an RS for the joint TCI state, a first QCL RS of a TCI state for the at least one CSI-RS resource being changed to a second QCL RS of a TCI state of the channel or the RS;
• transmitting, to the UE, at least one CSI-RS related to the at least one CSI-RS resource based on the second QCL RS;
• and
• receiving the CSI from the UE based on the at least one CSI-RS.