Method for transmitting/receiving signal and device therefor

A wireless device configured to transmit an uplink signal in a wireless communication system, the wireless device comprising:

• a radio frequency (RF) unit;
• and
• a processor operatively connected to the RF unit and configured to
• receive downlink (DL) scheduling information in a DL subframe on a secondary cell of a first Time Division Duplex (TDD) Uplink-Downlink (UL-DL) configuration;
• receive data indicated by the DL scheduling information in the DL subframe on the secondary cell;
• and
• transmit acknowledgement information on the data in a UL subframe on either a primary cell of a second TDD UL-DL configuration or the secondary cell,
• 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 a relation between the DL subframe and the UL subframe follows a relation defined for a third TDD UL-DL configuration different from the first TDD UL-DL configuration and the second TDD UL-DL configuration, the third TDD UL-DL configuration having a smallest number of DL subframes among one or more TDD UL-DL configurations having DL subframes located in a superset of DL positions of the first and second TDD UL-DL configurations.