Method of sounding a terminal in a wireless communication system and apparatus therefor

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

• a transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• receiving, from a base station, a configuration for at least one sounding reference signal (SRS) resource set through radio resource control (RRC) signaling;
• receiving, from the base station, information related to an SRS transmission activation of a specific SRS resource set among the at least one SRS resource set;
• and performing SRS transmission, corresponding to the specific SRS resource set, to the base station, and
• wherein a target reference signal to which a spatial relationship assumption is applied for each SRS resource included in the specific SRS resource set is determined based on the information,
• wherein, when the a type of at least one SRS resource included in the specific SRS resource set is configured in a semi-persistent type, the information is received through medium access control (MAC) control element (CE) signaling, and
• wherein, when the type of at least one SRS resource included in the specific SRS resource set is configured in an aperiodic type, the information is received through downlink control information (DCI) signaling.

A Base Station (BS) receiving uplink transmission in a wireless communication system, the BS comprising:

• a transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
• transmitting, to a user equipment (UE), a configuration for at least one sounding reference signal (SRS) resource set through radio resource control (RRC) signaling;
• transmitting, to the UE, information related to an SRS transmission activation of a specific SRS resource set among the at least one SRS resource set;
• and
• receiving SRS transmission, corresponding to the specific SRS resource set, from the UE, and
• wherein a target reference signal to which a spatial relationship assumption is applied for each SRS resource included in the specific SRS resource set is determined based on the information,
• wherein, when the a type of at least one SRS resource included in the specific SRS resource set is configured in a semi-persistent type, the information is received through medium access control (MAC) control element (CE) signaling, and
• wherein, when the type of at least one SRS resource included in the specific SRS resource set is configured in an aperiodic type, the information is received through downlink control information (DCI) signaling.