A method for transmitting an uplink signal by a communication device configured with a primary cell of a first Time Division Duplex Uplink-Downlink, TDD UL-DL, configuration and a secondary cell of a second TDD UL-DL configuration different from the first TDD UL-DL configuration in a wireless communication system, the method comprising: receiving data through a subframe #n-k (k∈K) of the secondary cell; and transmitting acknowledgement information on the data through a subframe #n, wherein TDD UL-DL configurations are defined as follows, in which D denotes a downlink subframe, S denotes a special subframe and U denotes an uplink subframe: Uplink-downlink configuration Subframe number 0 1 2 3 4 5 6 7 8 9 0 D S U U U D S U U U 1 D S U U D D S U U D 2 D S U D D D S U D D 3 D S U U U D D D D D 4 D S U U D D D D D D 5 D S U D D D D D D D 6 D S U U U D S U U D wherein K:{k 0, k 1,..., k M-1} is defined per TDD UL-DL configuration as follows, in which M is an integer equal to or greater than 1: TDD UL-DL Configuration Subframe n 0 1 2 3 4 5 6 7 8 9 0 - - 6 - 4 - - 6 - 4 1 - - 7, 6 4 - - - 7, 6 4 - 2 8, 7, 4, 6 - - - - 8, 7, 4, 6 - - 3 - - 7, 6, 11 6, 5 5, 4 - - - - - 4 - - 12, 8, 7, 11 6, 5, 4, 7 - - - - - - 5 - - 13, 12, 9, 8, 7, 5, 4, 11, 6 - - - - - - - 6 - - 7 7 5 - - 7 7 - characterized in: wherein if a combination of the first TDD UL-DL configuration and the second TDD UL-DL configuration corresponds to one of following combinations: - TDD UL-DL configuration #1 and TDD UL-DL configuration #3, - TDD UL-DL configuration #2 and TDD UL-DL configuration #3, and - TDD UL-DL configuration #2 and TDD UL-DL configuration #4, then for the transmission of the acknowledgement information, K:{k 0, k 1,..., k M-1} of a third TDD UL-DL configuration is used, wherein the third TDD UL-DL configuration is a TDD UL-DL configuration that has a smallest number of D and S subframes among one or more TDD UL-DL configurations in which one or more subframes configured as D or S in the primary cell or the secondary cell are all configured as D or S. receiving data through a subframe #n-k (k∈K) of the secondary cell; and transmitting acknowledgement information on the data through a subframe #n, wherein TDD UL-DL configurations are defined as follows, in which D denotes a downlink subframe, S denotes a special subframe and U denotes an uplink subframe: Uplink-downlink configuration Subframe number 0 1 2 3 4 5 6 7 8 9 0 D S U U U D S U U U 1 D S U U D D S U U D 2 D S U D D D S U D D 3 D S U U U D D D D D 4 D S U U D D D D D D 5 D S U D D D D D D D 6 D S U U U D S U U D wherein K:{k 0, k 1,..., k M-1} is defined per TDD UL-DL configuration as follows, in which M is an integer equal to or greater than 1: TDD UL-DL Configuration Subframe n 0 1 2 3 4 5 6 7 8 9 0 - - 6 - 4 - - 6 - 4 1 - - 7, 6 4 - - - 7, 6 4 - 2 8, 7, 4, 6 - - - - 8, 7, 4, 6 - - 3 - - 7, 6, 11 6, 5 5, 4 - - - - - 4 - - 12, 8, 7, 11 6, 5, 4, 7 - - - - - - 5 - - 13, 12, 9, 8, 7, 5, 4, 11, 6 - - - - - - - 6 - - 7 7 5 - - 7 7 - characterized in: wherein if a combination of the first TDD UL-DL configuration and the second TDD UL-DL configuration corresponds to one of following combinations: - TDD UL-DL configuration #1 and TDD UL-DL configuration #3, - TDD UL-DL configuration #2 and TDD UL-DL configuration #3, and - TDD UL-DL configuration #2 and TDD UL-DL configuration #4, then for the transmission of the acknowledgement information, K:{k 0, k 1,..., k M-1} of a third TDD UL-DL configuration is used, wherein the third TDD UL-DL configuration is a TDD UL-DL configuration that has a smallest number of D and S subframes among one or more TDD UL-DL configurations in which one or more subframes configured as D or S in the primary cell or the secondary cell are all configured as D or S. wherein if a combination of the first TDD UL-DL configuration and the second TDD UL-DL configuration corresponds to one of following combinations: - TDD UL-DL configuration #1 and TDD UL-DL configuration #3, - TDD UL-DL configuration #2 and TDD UL-DL configuration #3, and - TDD UL-DL configuration #2 and TDD UL-DL configuration #4, then - TDD UL-DL configuration #1 and TDD UL-DL configuration #3, - TDD UL-DL configuration #2 and TDD UL-DL configuration #3, and - TDD UL-DL configuration #2 and TDD UL-DL configuration #4, then for the transmission of the acknowledgement information, K:{k 0, k 1,..., k M-1} of a third TDD UL-DL configuration is used, wherein the third TDD UL-DL configuration is a TDD UL-DL configuration that has a smallest number of D and S subframes among one or more TDD UL-DL configurations in which one or more subframes configured as D or S in the primary cell or the secondary cell are all configured as D or S.