There is provided a method for determining transmission power for uplink signal, the method performed by a user equipment (UE) and comprising: determining a total transmission power for E-UTRA uplink signal and NR uplink signal, when the E-UTRA uplink signal and the NR uplink signal overlap in time, wherein the total transmission power satisfies a condition including on PCMAX_L and PCMAX_H, wherein PCMAX_L is a lower limit for the total transmission power and PCMAX_H is a higher limit for the total transmission power, wherein when the E-UTRA uplink signal is transmitted on a scheduling unit p, when the NR uplink signal is transmitted on a scheduling unit q, the scheduling unit p is taken as a reference for the determination; and transmitting the E-UTRA uplink signal and the NR uplink signal based on the determined total transmission power.