Fujitsu Corporation

Takeshi Kamura

Keiichi Nakatsugawa

Fumiyuki Iizuka

Nobutsugu Fujino

Itaru Nakagawa

Kazuhiro Muraoka

Yoshiyuki Seguchi

Hitoshi Koike

Hiraku Koganemaru

Hidetoshi Abeta

Masahiko Fuse

Naotaka Tsuji

Zenichi Yashiro

Itaru Fujitsu Limited Nakagawa

Hitoshi Fujitsu Limited Koike

Fumiyuki Fujitsu Limited Iizuka

Zenichi Fujitsu Limited Yashiro

Keiichi Fujitsu Limited Nakatsugawa

Nobutsugu Fujitsu Limited Fujino

A mobile node is arranged to perform a high-quality hand-over operation for eliminating an interruption time in communication and keeping the continuance of communication excellent. The mobile node has a function of interfacing with networks and includes a network quality monitor, a hand-over controller, and a network controller. The network quality monitor operates to monitor a network quality based on at least one of an intensity and a radio bandwidth of a radio wave received by network devices. The hand-over controller performs the hand-over operation of transmitting a care of address to an address registering destination in response to a state of the network quality before a communication is disconnected, changing a route of communication information, and switching a connecting destination into a new network. The network controller receives a response that indicates an update of the care of address in the address registering destination and keeping a function of receiving data from the network before being switched until the communication is disconnected.

Mobile node

In a mobile telephone communication system which performs telephone communications with a group including mobile subscribers to improve the rate of receiving telephone calls and quality of communication, the plurality of mobile subscribers each sends out information including a location number and a subscriber telephone number. A mobile switch center receives information from each mobile subscriber via a corresponding one of radio base stations and performs control of the calls from the mobile subscribers. The mobile switch center has a subscriber data table that stores a group indication which indicates the mobile subscribers of the group and a group number corresponding to the group as subscriber data, and performs, upon the occurrence of the registration of changing the state of one mobile subscriber, the same registration of changing the state (idle or busy) for all remaining mobile subscribers in the group, referring to the group indication and the group number sent from the one mobile subscriber.

Movable telephone communication system

Growing community of inventors

Kawasaki, Japan

Takeshi Kamura