A method for determining transmit power, P PUCCH (i) of an uplink, UL, control channel of a user equipment, UE, to which two cells having different uplink-downlink, UL-DL, configurations are assigned, wherein the first cell has a first UL-DL configuration and the second cell has a second UL-DL configuration, the method comprising: determining, by the UE, a parameter value; and transmitting, by the UE, the UL control channel carrying ACK/NACK bits in the subframe n of the first cell at a transmit power determined based on the parameter value, wherein the transmit power, P PUCCH (i), is determined by below equation: P PUCCH i = min P CMAX, c i, P 0 _ PUCCH + PL c + h n CQI n HARQ n SR + Δ F _ PUCCH F + Δ TxD F ′ + g i wherein in the equation, P CMAX,c (i) is a configured UE transmit power, P O_PUCCH is a parameter provided by a higher layer, PL c is a downlink pathloss estimation, h(n CQI, n HARQ, n SR) is a physical uplink control channel, PUCCH, format dependent value, n CQI is a number of information bits for channel quality information, n HARQ is the parameter value, n SR is 1 or 0, Δ F_PUCCH is a parameter corresponding to a PUCCH format relative to a PUCCH format 1a, ΔTxD(F') is a parameter related to two antenna ports transmission, g(i) is a parameter related to a current uplink control channel power control adjustment state, characterized in that based on the UE being scheduled for both of the first cell and the second cell, the n HARQ is 4 when the second cell receives two transport blocks, and n HARQ is 3 when the second cell receives one transport block, and wherein based on the UE being scheduled only for the first cell, the n HARQ = 2, and based on the UE being scheduled only for the second cell, the n HARQ = 2 or 1 respectively depending on whether a number of received transport blocks is 2 or 1. determining, by the UE, a parameter value; and transmitting, by the UE, the UL control channel carrying ACK/NACK bits in the subframe n of the first cell at a transmit power determined based on the parameter value, wherein the transmit power, P PUCCH (i), is determined by below equation: P PUCCH i = min P CMAX, c i, P 0 _ PUCCH + PL c + h n CQI n HARQ n SR + Δ F _ PUCCH F + Δ TxD F ′ + g i wherein in the equation, P CMAX,c (i) is a configured UE transmit power, P O_PUCCH is a parameter provided by a higher layer, PL c is a downlink pathloss estimation, h(n CQI, n HARQ, n SR) is a physical uplink control channel, PUCCH, format dependent value, n CQI is a number of information bits for channel quality information, n HARQ is the parameter value, n SR is 1 or 0, Δ F_PUCCH is a parameter corresponding to a PUCCH format relative to a PUCCH format 1a, ΔTxD(F') is a parameter related to two antenna ports transmission, g(i) is a parameter related to a current uplink control channel power control adjustment state, characterized in that based on the UE being scheduled for both of the first cell and the second cell, the n HARQ is 4 when the second cell receives two transport blocks, and n HARQ is 3 when the second cell receives one transport block, and wherein based on the UE being scheduled only for the first cell, the n HARQ = 2, and based on the UE being scheduled only for the second cell, the n HARQ = 2 or 1 respectively depending on whether a number of received transport blocks is 2 or 1.