Method and device for transmitting or 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 for transmitting and receiving a wireless signal;
• and
• at least one processor for controlling the at least one transceiver,
• wherein the at least one processor configured to:
• receive, from a base station, first configuration information related to CSI reporting and second configuration information related to CSI resources, wherein based on group-based reporting being configured by the first configuration information, the second configuration information includes information on M (M is a natural number) CSI resource set associated with the first configuration information;
• receive, from the base station, a CSI-reference signal (CSI-RS) on a plurality of CSI resources of the M CSI resource set based on the second configuration information;
• and
• transmit, to the base station, the CSI based on the first configuration information,
• wherein based on reporting for N (N is a natural number) CSI resource groups being configured by the first configuration information, each of the N CSI resource groups is configured with M CSI resources including one CSI resource from each of the M CSI resource sets,
• wherein the M CSI resources for each of the N resource groups are simultaneously received by the UE,
• wherein the CSI includes i) a layer1-reference signal received power (L1-RSRP) value or a layer 1-signal to interference and noise ratio (L1-SINR) value for a specific CSI resource within N′ (N′ is a natural number, 2≤N′≤N) CSI resource group and ii) differential L1-RSRP values or L1-SINR values for CSI resources other than the specific CSI resource in the N′ CSI resource groups,
• wherein the differential L1-RSRP values or L1-SINR values are calculated with reference to the L1-RSRP value or L1-SINR value for the specific CSI resource, and
• wherein the CSI further includes information indicating a CSI resource set associated with the specific CSI resource.

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

• at least one transceiver for transmitting and receiving a wireless signal;
• and
• at least one processor for controlling the at least one transceiver,
• wherein the at least one processor configured to:
• transmit, to a user equipment (UE), first configuration information related to CSI reporting and second configuration information related to CSI resources, wherein based on group-based reporting being configured by the first configuration information, the second configuration information includes information on M (M is a natural number) CSI resource set associated with the first configuration information;
• transmit, to the UE, a CSI-reference signal (CSI-RS) on a plurality of CSI resources of the M CSI resource set based on the second configuration information;
• and
• receive, from the UE, the CSI based on the first configuration information,
• wherein based on reporting for N (N is a natural number) CSI resource groups being configured by the first configuration information, each of the N CSI resource groups is configured with M CSI resources including one CSI resource from each of the M CSI resource sets,
• wherein the M CSI resources for each of the N resource groups are simultaneously received by the UE,
• wherein the CSI includes i) a layer1-reference signal received power (L1-RSRP) value or a layer 1-signal to interference and noise ratio (L1-SINR) value for a specific CSI resource within N′ (N′ is a natural number, 2≤N′≤N) CSI resource group and ii) differential L1-RSRP values or L1-SINR values for CSI resources other than the specific CSI resource in the N′ CSI resource groups,
• wherein the differential L1-RSRP values or L1-SINR values are calculated with reference to the L1-RSRP value or L1-SINR value for the specific CSI resource, and
• wherein the CSI further includes information indicating a CSI resource set associated with the specific CSI resource.