A method for transmitting an uplink signal by a device in a wireless communication system supporting carrier aggregation, the method comprising: configuring a first cell having a first Time Division Duplex Uplink-Downlink, TDD UL-DL, configuration and a second cell having a second TDD UL-DL configuration different from the first TDD UL-DL configuration; receiving one or more data within subframe #n-k' (k'∈K') of the first cell; and transmitting acknowledgement information about the one or more data in subframe #n of the second cell, wherein K' includes elements of K: {k 0, k 1,..., k M-1} such that subframe #n-k corresponds to a DL subframe or a special subframe of the first cell, wherein K: {k 0, k 1,..., k M-1} is a downlink association set index for a reference TDD UL-DL configuration and defined according to table 1, wherein the reference TDD UL-DL configuration is a TDD UL-DL configuration whose DL subframe set includes both a DL subframe set of the first TDD UL-DL configuration and a DL subframe set of the second TDD UL-DL configuration, and each DL subframe set includes DL subframes and one or more special subframe, wherein TDD UL-DL configurations are defined according to table 2: Table 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 - Table 2 Up link-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 D denotes a DL subframe, S denotes a special subframe and U denotes an UL sub frame. configuring a first cell having a first Time Division Duplex Uplink-Downlink, TDD UL-DL, configuration and a second cell having a second TDD UL-DL configuration different from the first TDD UL-DL configuration; receiving one or more data within subframe #n-k' (k'∈K') of the first cell; and transmitting acknowledgement information about the one or more data in subframe #n of the second cell, wherein K' includes elements of K: {k 0, k 1,..., k M-1} such that subframe #n-k corresponds to a DL subframe or a special subframe of the first cell, wherein K: {k 0, k 1,..., k M-1} is a downlink association set index for a reference TDD UL-DL configuration and defined according to table 1, wherein the reference TDD UL-DL configuration is a TDD UL-DL configuration whose DL subframe set includes both a DL subframe set of the first TDD UL-DL configuration and a DL subframe set of the second TDD UL-DL configuration, and each DL subframe set includes DL subframes and one or more special subframe, wherein TDD UL-DL configurations are defined according to table 2: Table 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 - Table 2 Up link-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