Uplink transmission method in unlicensed band in wireless communication system and terminal using same method

A method for transmitting a physical uplink shared channel (PUSCH) in a wireless communication system, the method performed by a user equipment (UE) and comprising:

• receiving information for a start symbol of the PUSCH;
• and
• transmitting the PUSCH the information for the start symbol of the PUSCH, wherein a cyclic prefix (CP) extension is performed during a specific interval preceding the start symbol of the PUSCH, and
• wherein the specific interval in which the CP extension is performed is determined based on a first variable and a second variable.

A user equipment (UE) comprising:

• a memory;
• a transceiver;
• and
• a processor operatively coupled to the memory and the transceiver, wherein the processor is configured to:
• control the transceiver to receive information for a start symbol of the PUSCH;
• and
• control the transceiver to transmit the PUSCH the information for the start symbol of the PUSCH,
• wherein a cyclic prefix (CP) extension is performed during a specific interval preceding the start symbol of the PUSCH, and
• wherein the specific interval in which the CP extension is performed is determined based on a first variable and a second variable.