Distance measurement method of user equipment in wireless communication system and user equipment using method

A first vehicle-to-X (V2X) user equipment (UE) for supporting distance measurement in a wireless communication system, the first V2X UE comprising:

• a transceiver configured to transmit and receive wireless signals;
• and
• a processor configured to control the transceiver,
• wherein the processor is configured to:
• receive a ranging request signal from a second V2X UE;
• and
• transmit a ranging response signal to the second V2X UE in response to the ranging request signal based on distance measurement parameter information,
• wherein the distance measurement parameter information comprises information about a cyclic prefix (CP) length used for the ranging response signal, and
• the CP length used for the ranging response signal is different from a CP length used for V2X data channel transmission.

A method of transmitting sidelink control information (SCI) in a wireless communication system, the method performed by a first vehicle-to-X (V2X) user equipment (UE) and comprising:

• transmitting, to a second V2X UE, sidelink control information (SCI) through a physical sidelink control channel (PSCCH),
• wherein the SCI is used for scheduling a physical sidelink shared channel (PSSCH),
• wherein the SCI includes at least one of:
• priority information related to scheduling the PSSCH;
• frequency information related to scheduling the PSSCH;
• time information related to scheduling the PSSCH;
• or
• modulation and coding scheme (MCS) information related to scheduling the PSSCH,
• transmitting, to the second V2X UE, the PSSCH based on the SCI;
• receiving a ranging request signal from the second V2X UE;
• and
• transmitting a ranging response signal to the second V2X UE in response to the ranging request signal based on distance measurement parameter information,
• wherein the distance measurement parameter information comprises information about a cyclic prefix (CP) length used for the ranging response signal, and
• the CP length used for the ranging response signal is different from a CP length used for V2X data channel transmission.