A method performed by a user equipment, UE, configured with a short processing time in a wireless communication system, the method comprising: receiving, from a base station, downlink control information, DCI, in a UE-specific search space, USS, the DCI scheduling an uplink transmission; receiving, from the base station, a power control command; identifying a parameter associated with a reception timing of the power control command for the uplink transmission; identifying a transmission power for the uplink transmission based on the power control command associated with the identified parameter; and transmitting, to the base station, an uplink signal based on the identified transmission power in a first subframe determined based on the DCI which is detected in the USS, wherein the parameter is identified from a first group of parameters, in case that the UE is configured with information associated with a physical uplink shared channel, PUSCH, transmission in a special subframe; wherein the parameter is identified from a second group of parameters, in case that the UE is not configured with the information, wherein the first group is given as following Table 1, and wherein the second group is given as following Table 2: [Table 1] time division duplex, TDD, uplink/downlink, UL/DL, configuration subframe number n 0 1 2 3 4 5 6 7 8 9 0 - 6 6 3 3 - 6 6 3 3 1 - 5 3 3 - - 5 3 3 - 2 - 3 3 - - - 3 3 - - 3 - 3 3 3 3 - - - - - 4 - 3 3 3 - - - - - - 5 - 3 3 - - - - - - - 6 - 5 3 3 4 - 5 6 3 -, and [Table 2] TDD UL/DL Configuration subframe number n 0 1 2 3 4 5 6 7 8 9 0 - - 6 3 3 - - 6 3 3 1 - - 3 3 - - - 3 3 - 2 - - 3 - - - - 3 - - 3 - - 3 3 3 - - - - - 4 - - 3 3 - - - - - - 5 - - 3 - - - - - - - 6 - - 6 4 4 - - 6 3 - where the subframe number n in the table 1 and the table 2 indicates the first subframe in which the uplink signal is transmitted. receiving, from a base station, downlink control information, DCI, in a UE-specific search space, USS, the DCI scheduling an uplink transmission; receiving, from the base station, a power control command; identifying a parameter associated with a reception timing of the power control command for the uplink transmission; identifying a transmission power for the uplink transmission based on the power control command associated with the identified parameter; and transmitting, to the base station, an uplink signal based on the identified transmission power in a first subframe determined based on the DCI which is detected in the USS, wherein the parameter is identified from a first group of parameters, in case that the UE is configured with information associated with a physical uplink shared channel, PUSCH, transmission in a special subframe; wherein the parameter is identified from a second group of parameters, in case that the UE is not configured with the information, wherein the first group is given as following Table 1, and wherein the second group is given as following Table 2: [Table 1] time division duplex, TDD, uplink/downlink, UL/DL, configuration subframe number n 0 1 2 3 4 5 6 7 8 9 0 - 6 6 3 3 - 6 6 3 3 1 - 5 3 3 - - 5 3 3 - 2 - 3 3 - - - 3 3 - - 3 - 3 3 3 3 - - - - - 4 - 3 3 3 - - - - - - 5 - 3 3 - - - - - - - 6 - 5 3 3 4 - 5 6 3 -, and [Table 2] TDD UL/DL Configuration subframe number n 0 1 2 3 4 5 6 7 8 9 0 - - 6 3 3 - - 6 3 3 1 - - 3 3 - - - 3 3 - 2 - - 3 - - - - 3 - - 3 - - 3 3 3 - - - - - 4 - - 3 3 - - - - - - 5 - - 3 - - - - - - - 6 - - 6 4 4 - - 6 3 - where the subframe number n in the table 1 and the table 2 indicates the first subframe in which the uplink signal is transmitted.