Method for reporting channel state information in wireless communication system and apparatus therefor

A user equipment (UE) configured to receive channel state information reference signal (CSI-RS) in a wireless communication system, the UE comprising:

• at least one transceiver configured to transmit and receive a wireless signal;
• and
• at least one processor functionally connected to the at least one transceiver,
• the at least one processor configured to:
• receive, from a base station (BS), configuration information related to a CSI-RS resource, and
• receive, from the BS, a CSI-RS on the CSI-RS resource including multiple code division multiplexing (CDM) groups,
• wherein the configuration information includes information for a CDM type, and information for a number of antenna ports,
• wherein locations of the CDM groups are based on the configuration information such that:
• locations of 2 CDM groups are determined by 1 time-domain location value and 2 frequency-domain location values based on the number of the antenna ports being ‘8’ and the CDM type being ‘CDM4’,
• locations of 3 CDM groups are determined by 1 time-domain location value and 3 frequency-domain location values based on the number of the antenna ports being ‘12’ and the CDM type being ‘CDM4’,
• locations of 4 CDM groups are determined by 1 time-domain location value and 4 frequency-domain location values based on the number of the antenna ports being ‘16’ and the CDM type being ‘CDM4’, and
• locations of 8 CDM groups are determined by 2 time-domain location values and 4 frequency-domain location values based on the number of the antenna ports being ‘32’ and the CDM type being ‘CDM4’.

A processing device configured to control a user equipment (UE) to receive channel state information reference signal (CSI-RS) in a wireless communication system, the processing device comprising:

• at least one processor;
• and
• at least one computer memory operably connected to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
• receiving, from a base station (BS), configuration information related to a CSI-RS resource, and
• receiving, from the BS, a CSI-RS on the CSI-RS resource including multiple code division multiplexing (CDM) groups,
• wherein the configuration information includes information for a CDM type, and information for a number of antenna ports,
• wherein locations of the CDM groups are based on the configuration information such that:
• locations of 2 CDM groups are determined by 1 time-domain location value and 2 frequency-domain location values based on the number of the antenna ports being ‘8’ and the CDM type being ‘CDM4’,
• locations of 3 CDM groups are determined by 1 time-domain location value and 3 frequency-domain location values based on the number of the antenna ports being ‘12’ and the CDM type being ‘CDM4’,
• locations of 4 CDM groups are determined by 1 time-domain location value and 4 frequency-domain location values based on the number of the antenna ports being ‘16’ and the CDM type being ‘CDM4’, and
• locations of 8 CDM groups are determined by 2 time-domain location values and 4 frequency-domain location values based on the number of the antenna ports being ‘32’ and the CDM type being ‘CDM4’.