Patent ID: 7693520
Filing Date: 2010-04-06
Classification: H04W

Abstract:
1. A method of selecting a new serving base station when a drop occurs in a mobile subscriber station in a broadband wireless access communication system including the mobile subscriber station, a serving base station communicating with the mobile subscriber station, and a plurality of neighbor base stations, different from the serving base station, the method comprising the steps of: i) detecting the drop after receiving information related to the neighbor base stations transmitted from the serving base station communicating with the mobile subscriber station; ii) monitoring frequency bands of the neighbor base stations included in the information related to the neighbor base stations, if the drop is detected; iii) detecting target base stations capable of serving as the new serving base station for communicating with the mobile subscriber station when the drop occurs in the mobile subscriber station according to a monitoring result for the frequency bands of the neighbor base stations; iv) selecting the new serving base station from the detected target base stations; and v) controlling the new serving base station by performing drop ranging in relation to the new serving base station using a predetermined drop ranging code after selecting the new serving base station in such a manner that the new serving base station recognizes that the mobile subscriber station is attempting to reestablish a communication with regard to the new base station due to the drop occurring in the mobile subscriber station.