Method of performing channel access procedure and apparatus therefor

A user equipment (UE) of performing an uplink (UL) transmission in a wireless communication system, the UE comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one memory operably connected to the at least one processor and configured to store instructions causing, when executed, the at least one processor to perform operations comprising:
• receiving, through the at least one transceiver, information related to a transmission beam for the UL transmission;
• determining a sensing beam based on (i) the information related to the transmission beam for the UL transmission and (ii) whether the UE fulfils a beam correspondence without an UL beam sweeping;
• performing a channel access procedure (CAP) on the sensing beam;
• and
• performing, through the at least one transceiver, the UL transmission through the transmission beam based on a channel for the CAP being sensed to be idle,
• wherein, based on the UE fulfilling the beam correspondence without the UL beam sweeping, the sensing beam is determined to be the same as the transmission beam, and
• wherein, based on the UE not fulfilling the beam correspondence without the UL beam sweeping, the sensing beam is determined to cover the transmission beam.

A method of receiving an uplink (UL) signal by a base station (BS) in a wireless communication system, the method comprising:

• transmitting, to a user equipment (UE), information related to a transmission beam for the UL signal;
• receiving, from the UE, the UL signal based on the transmission beam,
• wherein the UL signal is received based on a channel for a channel access procedure (CAP) on a sensing beam being sensed to be idle,
• wherein, based on the UE fulfilling the beam correspondence without the UL beam sweeping, the sensing beam is determined to be the same as the transmission beam, and
• wherein, based on the UE not fulfilling the beam correspondence without the UL beam sweeping, the sensing beam is determined to cover the transmission beam.

A base station (BS) of receiving an uplink (UL) signal in a wireless communication system, the BS comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one memory operably connected to the at least one processor and configured to store instructions causing, when executed, the at least one processor to perform operations comprising:
• transmitting, to a user equipment (UE) through the at least one transceiver, information related to a transmission beam for the UL signal;
• receiving, from the UE through the at least one transceiver, the UL signal based on the transmission beam,
• wherein the UL signal is received based on a channel for a channel access procedure (CAP) on a sensing beam being sensed to be idle,
• wherein, based on the UE fulfilling the beam correspondence without the UL beam sweeping, the sensing beam is determined to be the same as the transmission beam, and
• wherein, based on the UE not fulfilling the beam correspondence without the UL beam sweeping, the sensing beam is determined to cover the transmission beam.