Hitachi, Ltd.

Hiroshi Shouda

Yoshiyuki Machida

Kouichi Shiraishi

Kouhei Matsuzawa

Adjacent station information of various base stations communicating using CDMA is automatically updated. A maintenance apparatus () includes a protocol message acquisition unit () for acquiring protocol messages transmitted between each base station and a mobile terminal; a protocol message storage area () for storing the protocol messages; a base station information acquisition unit () for acquiring base station information of every base station; a base station information storage area () for storing the base station information of all the base stations; and an information update instruction unit (). The information update instruction unit () extracts a Route Update message at the time of hard handoff from the protocol message storage area (), and uses communication characteristic information of a handoff candidate base station included in that message, in order to specify the handoff candidate base station among base stations whose base station information is stored in the base station information storage area (). The information update instruction unit () instructs the handoff source base station to add the information on the specified handoff candidate base station to its adjacent station information.

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Yokohama, Japan

Hiroshi Shouda