Method for transmitting uplink signal through multiple unlicensed component carriers in wireless communication system supporting unlicensed band, and device supporting same

A user equipment (UE) configured to transmit an uplink signal on a plurality of unlicensed Component Carriers (CCs) belonging to different Timing Advance Groups (TAGs) in a wireless communication system supporting an unlicensed band, the UE comprising:

• a transmitter;
• a receiver;
• and
• a processor configured to operate by being connected to the transmitter and the receiver,
• wherein the processor is further configured to:
• determine a start point of a subframe that is earliest in a time domain from a specific timing among subframes on the plurality of the unlicensed CCs as a first transmission start point;
• perform a first channel access procedure on the plurality of the unlicensed CCs based on the first transmission start point;
• and
• based on a result of the first channel access procedure, perform an uplink signal transmission on the plurality of the unlicensed CCs from the first transmission start point, or perform a second channel access procedure for the uplink signal transmission based on a second transmission start point,
• wherein the second channel access procedure is different from the first channel access procedure, and the second transmission start point is different from the first transmission start point.

A processing apparatus configured to control a user equipment (UE) to transmit an uplink signal on a plurality of unlicensed Component Carriers (CCs) belonging to different Timing Advance Groups (TAGs) in a wireless communication system supporting an unlicensed band, the processing apparatus comprising:

• at least processor;
• and
• at least one computer memory operably connected to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
• determining a start point of a subframe that is earliest in a time domain from a specific timing among subframes on the plurality of the unlicensed CCs as a first transmission start point;
• performing a first channel access procedure on the plurality of the unlicensed CCs based on the first transmission start point;
• and
• based on a result of the first channel access procedure, performing an uplink signal transmission on the plurality of the unlicensed CCs from the first transmission start point, or performing a second channel access procedure for the uplink signal transmission based on a second transmission start point,
• wherein the second channel access procedure is different from the first channel access procedure, and the second transmission start point is different from the first transmission start point.