A mobile terminal (250) identifies a cell boundary (230) of a mobile communication network supporting an asynchronous scheme for handover between different communication systems (210,220). For this, a boundary indication base station (240) newly defines boundary indication codewords distinguished from existing codewords used for acquisition of frame synchronization, and transmits one of the boundary indication codewords over a secondary synchronization channel every frame. Upon receiving the boundary indication codeword over the secondary synchronization channel, the mobile terminal recognizes that it is located in a boundary of the mobile communication network supporting the asynchronous scheme, and performs handover to a mobile communication network supporting a synchronization scheme.
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