A method for transmitting Acknowledgement/Negative Acknowledgement (ACK/NACK) information at a User Equipment (UE) configured to use a Physical Uplink Control Channel (PUCCH) format 3 in a wireless communication system, the method includes transmitting ACK/NACK information for downlink transmission in a downlink frame set including M downlink subframes in one uplink subframe, where M≧1, wherein the ACK/NACK information is transmitted using a PUCCH format lb when at least one of specific conditions is met, wherein more than one serving cell is configured for the UE and the more than one serving cell includes one Primary Cell (PCell) and at least one Secondary Cell (SCell), wherein the specific conditions comprise: a first condition in case both one Physical Downlink Shared Channel (PDSCH), indicated by a detection of a corresponding Physical Downlink Control Channel (PDCCH), is present only on the PCell in the downlink subframe set, and a Downlink Assignment Index (DAI) value in the PDCCH is equal to 1, and a second condition in case one Semi-Persistent Scheduling (SPS) release PDCCH with the DAI value being equal to 1 is present on the PCell in the downlink subframe set.