Patent ID: 8699459
Filing Date: 2014-04-15
Classification: H04W

Abstract:
1. A method for a handover in a wireless access system supporting a multi-carrier operation, the method performed by a mobile station (MS) and comprising: transmitting a handover request message to a serving base station (BS) through a primary carrier of multi-carriers, the multi-carriers including the primary carrier and one or more secondary carriers; receiving a handover response message including temporary carrier information indicating one of the one or more secondary carriers as a temporary carrier for the handover; transmitting a ranging request message through the temporary carrier while simultaneously performing data transmission with the serving BS through the primary carrier, the ranging request message for synchronizing with a target; and receiving a ranging response message through the temporary carrier in response to the ranging request message while simultaneously performing the data transmission with the serving BS through the primary carrier, wherein the primary carrier is a standalone carrier that is usable without the one or more secondary carriers, and the one or more carriers are additional carriers that is not usable without the primary carrier.