Method and apparatus for allocating an uplink carrier for transmitting uplink control information in a wireless communication system

A user equipment (UE) for transmitting uplink control information in a wireless communication system, the UE being configured with more than one component carrier, the UE comprising:

• a receiving unit;
• a transmitting unit;
• and
• a processor,
• wherein the processor is configured to:
• multiplex ACK/NACK information with a scheduling request (SR), and
• transmit, in a single subframe, the multiplexed information through an uplink primary component carrier among the more than one component carrier, by using the transmitting unit,
• wherein the uplink primary component carrier is an uplink component carrier for transmitting the multiplexed information through a physical uplink control channel (PUCCH) among the more than one component carrier,
• wherein the transmission of the multiplexed information through the PUCCH is allowed only through the uplink primary component carrier, and is not allowed through uplink component carriers other than the uplink primary component carrier, and
• wherein the PUCCH is not simultaneously transmitted along with a physical uplink shared channel (PUSCH) in a single subframe.