Patent ID: 7542765
Filing Date: 2009-06-02
Classification: H04W

Abstract:
1. A method for performing a handoff to a target base station by selecting the target base station from among neighbor base stations when a mobile station moves away from a serving base station currently-connected to the mobile station, the method comprising: determining if the handoff is generated, by periodically measuring intensities of uplink/downlink signals in relation to the mobile station; estimating radio channels between the mobile station and the neighbor base stations when the handoff is generated; determining if the handoff is performed using a result of the estimation of the channels between the mobile station and the neighbor base stations; determining a base station, which represents a superior channel state and has a resource adaptable for the mobile station, as the target base station by using the result of the estimation of the channels between the mobile station and the neighbor base stations; enabling the target base station to select the most suitable resource for quality of service (QoS) of the mobile station and a multi-antenna operation mode for the mobile station operating with multiple antennas, by using the result of the estimation of the channels between the mobile station and the neighbor base stations and context information of the mobile station; and allocating the selected resource and the multi-antenna operation mode to the mobile station and performing the handoff, by the target base station, wherein, when the handoff occurs, the resource of the target base station suitable for the mobile station is found through the channel estimation, reserved, and allocated during the handoff.