Hitachi, Ltd.

Hitachi Communication Systems, Inc.

Koji Hirayama

Haruo Shibata

Koji Tanaka

Susumu Matsui

Masahiro Hayashi

Katsuyoshi Kitai

Tatsuaki Osafune

Mika Mizutani

Tohru Hoshi

Hideo Aoe

Shinichi Iwaki

Keisuke Shirai

Akio Kawase

Toshiya Ouchi

Shuichi Miyazaki

Tomohiro Hotta

Kiyohiko Yoshida

Shuuichi Kozawa

A service of reducing the number of tunnels in exchange for a specified service fee. A communication system, which generates tunnels in physical lines and multiplexes a plurality of sessions on the physical lines, comprises a monitor unit for monitoring the state of use of tunnels and sessions used by the user when the user using a plurality of tunnels is a customer who requires service of reserving sessions in a smaller number of tunnels in exchange for a specified service fee; a tunnel/session control unit performs control so as to gather the plurality of sessions of said user in a specified tunnel when the sessions currently used by the user can be reserved in a smaller number of tunnels; and a charging unit for charging a usage rate according to the number of tunnels or the number of physical lines used.

Communication system, a communication method and communication terminal

In a mobile communication system in which a plurality of base stations are connected to a communication network via a packet transfer node and a transmission rate of a forward link radio channel between a base station and a mobile station dynamically changes, each of the base stations designates a packet transmission rate in accordance with the status of a radio channel of each of mobile stations under control for the packet transmission node, and the packet control node transfers packets destined for each of mobile stations to the base station at the designated transfer rate.

Wireless base station and packet transfer apparatus for dynamically controlling data transmission rate

A switching system for realizing integration of existing communication networks or interconnections thereof, and a switching control method. After a call is originated from an ATM communication networkto an STM communication network, an ATMIFthat has received a connection request signal (control signal) converts the control signal into a format of an ATM cell, adds a header destined to one of SIG-to n for processing control signals, and then output the same. An ATMSWperforms self-routing based on header information. The selected one of the SIG-to n performs conversion for the ATM cellby a specified protocol, makes an ATM cellhaving a header destined to one of CLP-to k for processing control signals, and then output the same. Upon having received the ATM cell, the CLPlinks up with other processors to perform call connection control, functions having been dispersed among the other processors.

Switching system and switching control method

A communication relay system is connected to a line switched mobile communication system adapted to accommodate therein mobile terminals through radio channels and a packet switched mobile communication system adapted to accommodate therein the mobile terminals through radio channels. When a connection request has been made to a portable terminal, the communication relay system judges whether the portable terminal of interest is connected either to the line switched mobile communication system or to the packet switched mobile communication system.

Mobile communication system

A plurality of packet gate ways (PGWS) are connected between a mobile communication system and an internet so that the corresponding IP subnetworks to those PGWs may be built. A visitor location register (VLR) operates to notify the PGW of location information of the mobile station (MS) and an IP address of a data terminal connected with the MS. If the notified IP address belongs to another IP subnetwork, the PGW notifies the corresponding PGW to that IP subnetwork of a fact that the local PGW is a destination. The PGW operates to manage the location information of the MS connected with the data terminal based on the notified content and perform the packet routing based on the managed content.

Mobil communication system for providing IP packet communications and method for routing IP packets

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Chigasaki, Japan

Koji Hirayama