Method by which user equipment controls transmission power of sidelink signal in wireless communication system and apparatus therefor

An apparatus for controlling transmission power of a sidelink signal in a wireless communication system supporting sidelink, the apparatus comprising:

• a transceiver;
• and
• a processor operatively coupled to the transceiver,
• wherein the processor is configured to control the transceiver to receive configuration information for a resource pool for the sidelink signal, select a first transmission resource for a Physical Sidelink Control Channel (PSCCH) in the resource pool, select a second transmission resource for a Physical Sidelink Shared Channel (PSSCH) in the resource pool, allocate a transmission power for the PSCCH including scheduling information for the second transmission resource for the PSSCH, and transmit the PSCCH using a plurality of antenna units in the first transmission resource,
• wherein the processor measures a Channel Busy Ratio (CBR) related to the resource pool, and performs congestion control on the PSCCH based on the measured CBR,
• wherein the processor calculates required power for each of the plurality of antenna units based on a power loss of each of the plurality of antenna units, and determines reference transmission power based on the required power of each of the plurality of antenna units, and
• wherein the processor allocates the transmission power to each of the plurality of antenna units based on the reference transmission power and the required power of each of the plurality of antenna units, and
• wherein, based on a change ratio between the required power of each of the plurality of antenna units and the transmission power for each antenna unit exceeding a predetermined ratio, the reference transmission power is adjusted to decrease the change ratio to or below the predetermined ratio.