Patent ID: 8265632

Claim:
A radio communication system comprising a plurality of base station apparatuses, wherein communication areas of the plurality of base station apparatuses are connected in a loop to form a borderline separating an inside and an outside of a management area, a mobile terminal which enters the management area by crossing the borderline is detected on the basis of communication between the base station apparatuses and the mobile terminal, two borderlines including a first borderline and a second borderline are formed, whether the mobile terminal has entered the management area or has exited the management area is determined based on an order of the borderlines in which the mobile terminal communicates with the base station apparatus, wherein the radio communication system further comprises a management apparatus connected to the plurality of base station apparatuses which determines on the basis of a result of communication between a corresponding one of the base station apparatuses and the mobile terminal whether the mobile terminal has entered the management area, wherein after each of the base station apparatuses communicates with the mobile terminal in the communication area of the base station apparatus, the base station apparatus sends, to the management apparatus, a communication signal indicating the communication of the base station apparatus with the mobile terminal, and the management apparatus determines that the mobile terminal has entered the management area when the management apparatus receives, from one of the base station apparatuses which provides the communication area for the first borderline, a communication signal indicating communication with the mobile terminal and then receives, from one of the base station apparatuses which provides the communication area for the second borderline, a communication signal indicating communication with the mobile terminal and determines that the mobile terminal has exited the management area when the management apparatus receives, from one of the base station apparatuses which provides the communication area for the second borderline, a communication signal indicating communication with the mobile terminal and then receives, from one of the base station apparatuses which provides the communication area for the first borderline, a communication signal indicating communication with the mobile terminal.