Method and apparatus for performing sidelink-based positioning

A first apparatus for performing wireless communication, the first apparatus comprising:

• one or more memories storing instructions;
• one or more transceivers;
• and
• one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to:
• receive information related to an absolute position of a positioning reference, from the positioning reference;
• obtain a first positioning reference signal (PRS) reception timing, based on a PRS received from the positioning reference;
• obtain a second PRS reception timing at which a second apparatus receives the PRS from the positioning reference, based on a phase difference value between first RSs received on first subcarriers from the second apparatus;
• obtain a third PRS reception timing at which a third apparatus receives the PRS from the positioning reference, based on a phase difference value between second RSs received on second subcarriers from the third apparatus;
• estimate a relative position of the positioning reference, based on the first PRS reception timing, the second PRS reception timing, and the third PRS reception timing;
• and
• obtain position information of the first apparatus, based on the absolute position and the relative position.

An apparatus configured to control a first user equipment (UE), the apparatus comprising:

• one or more processors;
• and
• one or more memories operably connectable to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to:
• receive information related to an absolute position of a positioning reference, from the positioning reference;
• obtain a first positioning reference signal (PRS) reception timing, based on a PRS received from the positioning reference;
• obtain a second PRS reception timing at which a second UE receives the PRS from the positioning reference, based on a phase difference value between first RSs received on first subcarriers from the second UE;
• obtain a third PRS reception timing at which a third UE receives the PRS from the positioning reference, based on a phase difference value between second RSs received on second subcarriers from the third UE;
• estimate a relative position of the positioning reference, based on the first PRS reception timing, the second PRS reception timing, and the third PRS reception timing;
• and
• obtain position information of the first UE, based on the absolute position and the relative position.