Patent ID: 8498649

Claim:
A method for wireless communication between a user equipment and a base station in a wireless communication system that supports a first user equipment that uses a single frequency band and a second user equipment that uses a plurality of frequency bands, the method comprising: receiving, by the second user equipment from the base station, resource allocation information including information regarding a downlink component carrier and an uplink component carrier allocated to the user equipment; receiving, by the second user equipment from the base station, downlink data signal through the allocated downlink component carrier; and transmitting, by the second user equipment to the base station, uplink data signal through the allocated uplink component carrier by applying a cell ID thereto, wherein the allocated downlink component carrier is one of a plurality of downlink component carriers to which different cell IDs are applied, a plurality of pairs of component carriers are predefined by associating a plurality of uplink component carriers respectively with a plurality of downlink component carriers in order to support the first user equipment, and, when the allocated downlink component carrier and the allocated uplink component carrier do not correspond to any pair of component carriers in the plurality of pairs of component carriers, the cell ID applied to the allocated uplink component carrier is a cell ID of a downlink component carrier that is paired with the allocated uplink component carrier in the plurality of predefined pairs of component carriers.