Method of performing uplink transmission in wireless communication system and apparatus therefor

A terminal for performing an uplink transmission in a wireless communication system, without beam correspondence, the terminal comprising,

• a transceiver, and
• a processor, operatively coupled to transceiver,
• wherein the processor is configured to:
• transmit, to a base station (BS), at least one Uplink Reference Signal (UL RS);
• receive, from the BS, information related to an Uplink Transmission beam (UL Tx beam) of the terminal;
• and
• transmit, to the BS, a specific uplink channel through the UL Tx beam, based on the information,
• wherein the UL Tx beam is determined among one or more UL Tx beams of the terminal, by using the at least one UL RS,
• wherein, when the terminal does not receive the information from the BS, the specific uplink channel is transmitted through a pre-determined UL Tx beam of the terminal, and
• wherein, when the at least one UL RS is transmitted over a plurality of slots, the terminal is configured to receive, from the BS, information for prohibiting the transmission through the UL Tx beam before a beam procedure related to the at least one UL RS is terminated.