A method is described for transmitting a control signal in a wireless communication system. A wireless communication system supporting multiple antennas, transmits, by a user equipment (UE), a control signal on an uplink control channel at a subframe i. Furthermore, an uplink transmit power PPUCCH(i) for the uplink control channel at the subframe i is determined based on a mathematical equation. Additionally, the mathematical equation includes a min function and uses parameters including PCMAX(i), P0_PUCCH, ΔF_PUCCH(F), g(i), PL, Δ(M) and PL where PCMAX(i) is a configured UE transmit power in subframe i, P0_PUCCH is a parameter composed based on provisions by a higher layer, ΔF_PUCCH(F) is a parameter provided by the higher layer, PL is a downlink pathloss estimate calculated in the UE, and g(i) is a value relating to a UE specific value.