Method and apparatus for transmitting ack/nack for downlink transmission in wireless communication system

A relay node (RN) for transmitting ACK/NACK information in response to downlink transmissions in a wireless communication system, the RN comprising:

• a plurality of antennas;
• and
• a processor configured to support a transmission of ACK/NACK information by controlling the plurality of antennas,
• wherein the processor is further configured to:
• receive, from a base station (BS), downlink transmissions in downlink subframes, and
• transmit, to the BS, the ACK/NACK information for the downlink transmissions in one uplink subframe associated with the downlink subframes,
• wherein the downlink subframes and the uplink subframe are configured for a time division duplex (TDD),
• wherein physical uplink control channel (PUCCH) resources are configured by a higher layer, and each of the PUCCH resources is corresponding to each of the downlink subframes, and
• wherein each of the downlink subframes associated with the one uplink subframe is sequentially mapped to each of the PUCCH resources starting from a downlink subframe among the downlink subframes that is closest in time to the one uplink subframe.