1. A method, comprising:establishing a communication in a multi-carrier wireless communication system using a primary carrier;
transmitting a first downlink control signaling using the primary carrier, the first downlink control signaling assigning at least one secondary carrier;
receiving a channel quality indication over an uplink control channel on the primary carrier, the channel quality indication corresponding to the at least one secondary carrier; and
transmitting a second downlink control signaling using the primary carrier, the second downlink control signaling changing the primary carrier to a second different primary carrier.