Method and apparatus for transmitting or receiving reference signal in wireless communication system

A terminal performing beam management in a wireless communication system, the terminal comprising:

• a radio frequency (RF) module transmitting and receiving a radio signal;
• and
• a processor controlling the RF module,
• wherein the processor is configured to:
• receive configuration information of Channel State Information (CSI)-RS from a base station,
• receive the CSI-RS based on the configuration information, wherein the CSI-RS is transmitted through a plurality of antenna ports, and
• configure a beam of each of the plurality of antenna ports based on the CSI-RS,
• wherein the CSI-RS is mapped a subcarrier on a frequency axis at an interval of resource elements (REs) of a predetermined number,
• wherein the CSI-RS is repeatedly transmitted at the interval of the predetermined number of resource elements (REs) within a specific time interval,
• wherein the CSI-RS is repeatedly transmitted through a plurality of beams,
• wherein, in the configuring of the beam, the processor is configured to:
• reconstruct a CSI-RS transmitted in a specific antenna port among the plurality of antenna ports using a CSI-RS repeatedly received through a specific beam among the plurality of beams,
• calculate a reception signal-to-interference-noise-ratio (SINR) and/or signal-to-noise ratio (SNR) through the reconstructed CSI-RS, and
• perform a beam sweeping operation for beam configuration through the plurality of beams based on the reception SINR and/or SNR.