A method of transmitting, by a user equipment, UE, power measurement information related to beam reporting in a wireless communication system, the method comprising: reporting, to a base station, UE capability information; receiving downlink control information, DCI, triggering reporting of the power measurement information; receiving a downlink reference signal for the reporting of the power measurement information; and transmitting, to the base station, an uplink channel containing the power measurement information determined based on the received downlink reference signal, wherein based on the reporting of the power measurement information being configured for Layer 1 reference signal received power, L1-RSRP, reporting: a minimum required time for the reporting of the power measurement information is determined based on (i) a first timing parameter related to a first number of symbols between a last symbol of the downlink reference signal and a first symbol of the uplink channel, and (ii) a second timing parameter related to a second number of symbols between the DCI triggering the reporting of the power measurement information and a timing of the downlink reference signal, wherein information regarding the second timing parameter is reported as the UE capability information, wherein, for a subcarrier spacing of 60 kHz or 120 kHz, the minimum required time for the reporting of the power measurement information is determined based on a sum of (i) the first timing parameter and (ii) the second timing parameter, and wherein, based on the sum exceeding an upper bound value, the minimum required time for the reporting of the power measurement information is determined based on the upper bound value. reporting, to a base station, UE capability information; receiving downlink control information, DCI, triggering reporting of the power measurement information; receiving a downlink reference signal for the reporting of the power measurement information; and transmitting, to the base station, an uplink channel containing the power measurement information determined based on the received downlink reference signal, wherein based on the reporting of the power measurement information being configured for Layer 1 reference signal received power, L1-RSRP, reporting: a minimum required time for the reporting of the power measurement information is determined based on (i) a first timing parameter related to a first number of symbols between a last symbol of the downlink reference signal and a first symbol of the uplink channel, and (ii) a second timing parameter related to a second number of symbols between the DCI triggering the reporting of the power measurement information and a timing of the downlink reference signal, wherein information regarding the second timing parameter is reported as the UE capability information, wherein, for a subcarrier spacing of 60 kHz or 120 kHz, the minimum required time for the reporting of the power measurement information is determined based on a sum of (i) the first timing parameter and (ii) the second timing parameter, and wherein, based on the sum exceeding an upper bound value, the minimum required time for the reporting of the power measurement information is determined based on the upper bound value.