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