Method of transmitting uplink phase tracking reference signal by user equipment in wireless communication system and apparatus supporting same

A user equipment (UE) configured to transmit a phase tracking reference signal (PT-RS) in a wireless communication system, the UE comprising:

• a radio frequency (RF) module;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• obtaining precoding matrix information for transmission of a Physical Uplink Shared Channel (PUSCH);
• and
• transmitting, to a base station, the PT-RS based on power boosting level determined based on the precoding matrix information,
• wherein the power boosting level is related to a ratio of PUSCH power to PT-RS power per layer and per resource element (RE),
• wherein the power boosting level is determined based on an actual number of PT-RS ports for the UE, based on that the precoding matrix information relates to a partial coherent precoding matrix or a non-coherent matrix,
• wherein, based on that a higher layer parameter related to a number of PT-RS ports equals to 2, the actual number of PT-RS ports is determined based on that:
• sounding reference signal (SRS) port 0 and 2 related to the precoding matrix information share PT-RS port 0,
• SRS port 1 and 3 related to the precoding matrix information share PT-RS port 1.