Method and device for transmitting control information in a wireless communication system

A user equipment (UE) for transmitting an Acknowledgement/Negative Acknowledgement (ACK/NACK) signal in a wireless communication system, the UE comprising:

• a Radio Frequency (RF) unit configured to receive and transmit radio signals;
• and
• a processor configured to control the RF unit, wherein the processor is further configured to:
• receive a Physical Downlink Shared Channel(PDSCH) from only a primary cell, wherein the UE is configured with a Physical Uplink Control Channel (PUCCH) format 3;
• and
• transmit an ACK/NACK signal corresponding to the PDSCH using a first PUCCH format,
• wherein the first PUCCH format is one of PUCCH format 1a and a PUCCH format 1b,
• wherein the ACK/NACK signal is transmitted through a first antenna port and a second antenna port, and
• wherein a first PUCCH resource for the first antenna port and a second PUCCH resource for the second antenna port are different from each other.