A method of a user equipment for transmitting an uplink signal in a wireless communication system is disclosed. The method comprises receiving configuration information related to a plurality of transmission configuration indication (TCI) states, and transmitting the uplink signal based on a specific TCI state among the plurality of TCI states. The specific TCI state includes at least one of i) a reference RS used for an uplink transmission or ii) a reference RS commonly used for the uplink transmission and a downlink reception. A transmission power of the uplink signal is determined based on the specific TCI state, and the specific TCI state is related to one or more power control parameters for determining the transmission power of the uplink signal.