A method for a wireless device to which a plurality of serving cells are assigned transmitting uplink control information (UCI) in a wireless communication system is provided. The wireless device transmits uplink data in a subframe to a physical uplink shared channel (PUSCH), and transmits UCI including a hybrid automatic repeat request (HARQ) ACK/NACK and periodic channel state information (CSI) in the subframe to a physical uplink shared channel (PUCCH). The PUCCH and the PUSCH have the same demodulation reference signal (DMRS) location within the subframe.