A method for allocating a first transmission power and a second transmission power, the method performed by a user equipment, UE, and comprising: allocating the first transmission power on a first carrier; and allocating the second transmission power on a second carrier, wherein, based on a length of a representative transmission time interval, TTI, of the first carrier and a length of a representative TTI of the second carrier, the UE allocates the second transmission power after allocating the first transmission power, wherein the length of the representative TTI of the first carrier is shorter than the representative TTI of the second carrier, wherein the first transmit power has a greater value than the second transmit power, characterized in that on the first carrier, the UE transmits a physical sidelink control channel, PSCCH, a first physical sidelink shared channel, PSSCH, and a second PSSCH, wherein the PSCCH and the first PSSCH are frequency division multiplexed and the PSCCH and the second PSSCH are frequency division multiplexed, wherein the region of the PSCCH overlaps with the region of the first PSSCH on a time domain, and the region of the PSCCH does not overlap with the region of the second PSSCH on the time domain, wherein a transmission power on the region of the first PSCCH is different from a transmission power on the region of the second PSCCH, wherein the UE receives, from a base station, a power difference information or power difference ratio information between the region of the first PSCCH and the region of the second PSCCH, and wherein a demodulation reference signal, DM-RS, symbol is only transmitted on the region of the first PSSCH and not transmitted on the region of the second PSSCH. allocating the first transmission power on a first carrier; and allocating the second transmission power on a second carrier, wherein, based on a length of a representative transmission time interval, TTI, of the first carrier and a length of a representative TTI of the second carrier, the UE allocates the second transmission power after allocating the first transmission power, wherein the length of the representative TTI of the first carrier is shorter than the representative TTI of the second carrier, wherein the first transmit power has a greater value than the second transmit power, characterized in that on the first carrier, the UE transmits a physical sidelink control channel, PSCCH, a first physical sidelink shared channel, PSSCH, and a second PSSCH, wherein the PSCCH and the first PSSCH are frequency division multiplexed and the PSCCH and the second PSSCH are frequency division multiplexed, wherein the region of the PSCCH overlaps with the region of the first PSSCH on a time domain, and the region of the PSCCH does not overlap with the region of the second PSSCH on the time domain, wherein a transmission power on the region of the first PSCCH is different from a transmission power on the region of the second PSCCH, wherein the UE receives, from a base station, a power difference information or power difference ratio information between the region of the first PSCCH and the region of the second PSCCH, and wherein a demodulation reference signal, DM-RS, symbol is only transmitted on the region of the first PSSCH and not transmitted on the region of the second PSSCH.