A method for transmitting acknowledgement/non-acknowledgement, ACK/NACK, signals by a user equipment, UE, in a wireless communication system using carrier aggregation, CA, the method comprising: receiving, from a base station, a physical downlink control channel, PDCCH, signal in a primary cell, Pcell, or a secondary cell, Scell; receiving, from the base station, data on a physical downlink shared channel, PDSCH, scheduled by the PDCCH signal; and transmitting an acknowledgement signal in response to reception of the data in a timing position, wherein the timing position is determined based on an uplink, UL / downlink, DL configuration on the Pcell or the Scell, wherein the UL/DL configuration is configured based on at least one of a Pcell UL/DL configuration and a Scell UL/DL configuration in a time division duplexing, TDD, mode, in case that the Pcell UL/DL configuration and the Scell UL/DL configuration are different and the ACK/NACK is transmitted corresponding to alone downlink subframes of Scell, and wherein the determined timing position comprises: a timing position corresponding to a DL subframe in an Scell, if a DL subframe in the Scell and a DL subframe in a Pcell have the same timing position; and a timing position determined based on a minimum time duration for processing data of the UE so that the duration between the timing position of each downlink subframe in the Scell and the corresponding timing position for transmitting ACK/NACK is greater than or equal to the minimum duration of UE's processing data, if the DL subframe in the Scell and a UL subframe in the Pcell have the same timing position. receiving, from a base station, a physical downlink control channel, PDCCH, signal in a primary cell, Pcell, or a secondary cell, Scell; receiving, from the base station, data on a physical downlink shared channel, PDSCH, scheduled by the PDCCH signal; and transmitting an acknowledgement signal in response to reception of the data in a timing position, wherein the timing position is determined based on an uplink, UL / downlink, DL configuration on the Pcell or the Scell, wherein the UL/DL configuration is configured based on at least one of a Pcell UL/DL configuration and a Scell UL/DL configuration in a time division duplexing, TDD, mode, in case that the Pcell UL/DL configuration and the Scell UL/DL configuration are different and the ACK/NACK is transmitted corresponding to alone downlink subframes of Scell, and wherein the determined timing position comprises: a timing position corresponding to a DL subframe in an Scell, if a DL subframe in the Scell and a DL subframe in a Pcell have the same timing position; and a timing position determined based on a minimum time duration for processing data of the UE so that the duration between the timing position of each downlink subframe in the Scell and the corresponding timing position for transmitting ACK/NACK is greater than or equal to the minimum duration of UE's processing data, if the DL subframe in the Scell and a UL subframe in the Pcell have the same timing position. a timing position corresponding to a DL subframe in an Scell, if a DL subframe in the Scell and a DL subframe in a Pcell have the same timing position; and a timing position determined based on a minimum time duration for processing data of the UE so that the duration between the timing position of each downlink subframe in the Scell and the corresponding timing position for transmitting ACK/NACK is greater than or equal to the minimum duration of UE's processing data, if the DL subframe in the Scell and a UL subframe in the Pcell have the same timing position. <EOS>