Fujitsu Corporation

Hiroomi Yazaki

Takeshi Kunugi

Makoto Ueno

Kazuya Ohyama

A mobile communication system intended to control switching of a voice channel (handover) when a radio zone boundary is traversed; to quickly detect an unlawful mobile station; to equalize load if processing at a base control station is congested; and to constitute a location area for reducing control channel load due to simultaneous paging. The user is notified that a handover factor has been detected, and a switch enables the user's intention to be transmitted to the network to switch or stop the voice channel in accordance with the will of the mobile station user who is making the call. User accumulated call accounting information is totaled by the network and the mobile station individually for comparison to detect an unlawful mobile station. The number of base stations controlled by the base control station is, in real time, dynamically, changed to correspond to the state of congestion. Controls signals to the mobile stations are transmitted to a plurality of base control stations via a network of control lines. If the base control station detects process congestion, a portion of the controlled base stations is consigned to an adjacent base control station. The number of radio zones constituting the location area is, in real time, changed to correspond to the state of load for the call process to share load with the adjacent location area.

Mobile communication system with a load balancing feature

A mobile communication system intended to early detect unlawful mobile station. User information about accumulated call account is totaled by the network and the mobile station individually so as to be subjected to a comparison to found an unlawful mobile station.

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Yokohama, Japan

Hiroomi Yazaki