Method for transmitting/receiving uplink signal and apparatus for same

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

• at least one transceiver;
• at least one processor;
• and
• at least one computer memory operatively connected to the at least one processor and configured to store instructions that when executed causes the at least one processor to perform operations including:
• performing first listen before talk (LBT) based on a first sensing beam from among a plurality sensing beams;
• transmitting an LBT failure indication to a medium access control (MAC) entity based on failure of the first LBT;
• counting a number of the transmitted LBT failure indications due to consistent failure of the first LBT by the MAC entity;
• based on that the number of the LBT failure indications reaches a maximum counter value related to the first sensing beam, selecting a second sensing beam different from the first sensing beam from among the plurality of sensing beams;
• performing second LBT based on the second sensing beam;
• and
• based on success of the second LBT, performing the UL transmission through a transmission beam covered by the second sensing beam, through the at least one transceiver,
• wherein maximum counter values related to the plurality of sensing beams are separately related to the plurality of sensing beams, respectively.

A method for performing uplink (UL) reception by a base station (BS) in a wireless communication system, the method comprising:

• transmitting information related to a transmission beam for the UL reception;
• and
• performing the UL reception based on the information related to the transmission beam,
• wherein the UL reception is performed based on success of a first LBT based on a first sensing beam covering the transmission beam,
• the first sensing beam is reselected from among a plurality of sensing beams based on that a number of consistent failures of a second LBT based on a sensing beam different from the first sensing beam reaches a maximum counter value related to the second sensing beam, and
• maximum counter values related to the plurality of sensing beams are separately related to the plurality of sensing beams, respectively.