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, 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, Z, for the reporting of the power measurement information is determined based on (i) a first timing parameter, Z', related to a first time duration from a last timing of the downlink reference signal to a transmission timing of the power measurement information and (ii) a second timing parameter, m, related to a second time duration from a timing of a triggering DCI to a timing of the downlink reference signal, wherein information regarding the second timing parameter is reported as the UE capability information, wherein the minimum required time for reporting of the power measurement information is determined based on the first timing parameter and the second timing parameter such that: for (i) a subcarrier spacing of 120 kHz and (ii) the second timing parameter having a value of 14: the minimum required time for reporting of the power measurement information is calculated as a sum of (i) the first timing parameter and (ii) the second timing parameter, and for (i) a subcarrier spacing of 60 kHz or 120 kHz and (ii) the second timing parameter having a value of one of 224 and 336: the minimum required time for the reporting of the power measurement information is determined to be equal to a sum of (i) the first timing parameter and (ii) a specific constant value smaller or equal to 48. 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, 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, Z, for the reporting of the power measurement information is determined based on (i) a first timing parameter, Z', related to a first time duration from a last timing of the downlink reference signal to a transmission timing of the power measurement information and (ii) a second timing parameter, m, related to a second time duration from a timing of a triggering DCI to a timing of the downlink reference signal, wherein information regarding the second timing parameter is reported as the UE capability information, wherein the minimum required time for reporting of the power measurement information is determined based on the first timing parameter and the second timing parameter such that: for (i) a subcarrier spacing of 120 kHz and (ii) the second timing parameter having a value of 14: the minimum required time for reporting of the power measurement information is calculated as a sum of (i) the first timing parameter and (ii) the second timing parameter, and for (i) a subcarrier spacing of 60 kHz or 120 kHz and (ii) the second timing parameter having a value of one of 224 and 336: the minimum required time for the reporting of the power measurement information is determined to be equal to a sum of (i) the first timing parameter and (ii) a specific constant value smaller or equal to 48. for (i) a subcarrier spacing of 120 kHz and (ii) the second timing parameter having a value of 14: the minimum required time for reporting of the power measurement information is calculated as a sum of (i) the first timing parameter and (ii) the second timing parameter, and for (i) a subcarrier spacing of 60 kHz or 120 kHz and (ii) the second timing parameter having a value of one of 224 and 336: the minimum required time for the reporting of the power measurement information is determined to be equal to a sum of (i) the first timing parameter and (ii) a specific constant value smaller or equal to 48.