Method for performing beam measurement in wireless communication system and device therefor

A User Equipment for performing a beam related reporting in a wireless communication system, the UE comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one computer memory 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 a plurality of reference signals based on a plurality of beam groups of the UE, and with each beam group comprising one or more beams,
• wherein each of the plurality of beam groups is identified by an index;
• performing a measurement per each of the plurality of beam groups based on the plurality of reference signals;
• and
• transmitting a beam related report comprising reporting contents corresponding to each of the plurality of beam groups,
• wherein a reporting content for each beam group includes (i) measurement information for each beam group, (ii) the index of each beam group, and (iii) information indicating a transmission (TX) beam corresponding to a reception (RX) beam included in each beam group,
• wherein the measurement information comprises Reference Signal Received Power (RSRP) information measured for each of the plurality of beam groups, and
• wherein the reporting content for each beam group further includes information for a number of antenna ports used for RSRP measurement for each of the plurality of beam groups.