Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Hitachi-kokusai Electric Inc.

National Institute of Information and Communications Technology, Incorporated Administrative Agency

Mitsubishi Denki Kaisha

Takashi Sakakura

Jose Uemura

Masugi Inoue

Shinya Fushimi

Khaled Mahmud

Gang Wu

Ryozo Kiyohara

Yoneo Watanabe

Koji Yamaoka

A gateway transmits a communication switch request to a communication control unit by HTTP communication. The communication switch request serves to switch connection with a data center from HTTP communication to WebSocket communication. The communication control unit, when the communication switch request is received from the gateway, switches communication with the gateway device to WebSocket communication. A mobile terminal transmits a management execution request requesting execution of a management process of a PLC, to the data center. The communication control unit transmits a session establishing request requesting establishment of a session with the PLC, to the gateway by WebSocket communication based on the received management execution request.

Management system for a control system, gateway device, server device, management method, gateway method, and management process execution method

In a network system, an internet is connected with a gateway router through a wire link, a plurality of access routers are connected with each other through wireless links, and one access router is connected with the gateway router through a wireless link. Each wireless link connects a Bluetooth device of one access router and a Bluetooth device of another access router or a Bluetooth device of the gateway router. When a wireless terminal unit is connected with one access router through one wireless link while issuing a network connect request, the gateway router functions as a gateway to the wire link, and an IP route from the wireless link connected with the wireless terminal unit to the wire link is set.

Network system dynamically made for a short-distance wireless communication and network structuring method

The present invention aims to perform communication between the wireless terminals by adopting the existing networks and by avoiding the congestion on the network. The terminal location databases set at various networks control the position information of the wireless terminals. According to one of the steps in the method of the present invention, a wireless terminal inquires a terminal location database for the position information of a destination wireless terminal. Then, as for the next step, the wireless terminal receives a reply from the terminal location database regarding the position information of the destination wireless terminal. As for the following step, the wireless terminal communicate to the destination wireless terminal.

Wireless terminal communication method

A radio communication control station including a packet receiver, a paging controller, a location information receiver, and a retriever. The packet receiver receives an IP packet destined for a radio communication terminal subscribing to one of sub-networks constituting a composite radio communication network. The paging controller causes one of the sub-networks to page the radio communication terminal. The location information receiver receives location information on a current location of the radio communication terminal from the radio communication terminal. The retriever retrieves candidates of sub-networks that can be employed by the radio communication terminal on the basis of the location information on the radio communication terminal. The radio communication terminal selects a sub-network for its use among from the candidates and establishes an environment for communication with the sub-network.

Radio communication control station, radio communication terminal, home agent, and radio communication method

In a multiservice wireless communication system according to the present invention, a location managerof a multiservice terminaldetects its own position with a GPS receiver interface. The location manager sends the detected positional information to a management servervia a common-signaling wireless network base stationin which respective multiple service zones serviced by multiple wireless systems overlap in a common-signaling wireless zone and acquires information on available wireless systems as a response to that. A network selecting sectionselects a wireless system that most matches selecting conditions from the acquired available wireless systems and performs communication via the interfacesandthat operate the selected wireless system.

Multi-service radio communication system

In a system where a plurality of mobile terminals shares a data of the server, upon issuing an update request data of server from the mobile terminals, without depending on the stability of the communication method used by the mobile terminals, a fair data updating becomes possible which only relies on an issuing order of the update request. In the present system, the clock module is provided to all the mobile terminals and the server having a synchronized time. The mobile terminal adds the update request issuing time obtained from the timing module to the update request data upon issuing the update request data, and the update request data is repeatedly sent until the server receives it. During the repeated transmission, an issuing time attached to the update request is identical to the original issuing time, and the server processes the data update request received within the update request reception period in an order of the issuing time.

Method and system for updating a data system in conjunction with synchronized clock modules

The present invention endorses the communication of the client and server type application program to have a good response time even if using the communication media having low transferring rate and high latency, even if the relay communication points are increased, and even if the physical distance of the communication route is increased. The characteristic of the present invention is achieved by measuring the communication characteristic between the server program on the server machine and the client machine , and if the measured communication characteristic is not up to a pre-determined communication characteristic standard, then at least a part of the server program is replicated to a server candidate machine situated closest to the client machine , and the client program on the client machine connects to the replicated server program

Method of improving communication using replicated server program

Each subnet has an environment for executing the agent service program. When a request for service such as file system is made from the subnet B to the subnet A by a user, a client side agent created at the subnet B further creates a peer agent, and the peer agent is transmitted to the subnet A according to the communication condition such as a firewall which is already being notified. A peer-to-peer session is configured between the agents.

Agent method and computer system

The facsimile modem of the present invention comprises a computer interface, a switching unit, and a memory unit. The objective of the present invention is this line-switching facsimile modem that can transmit a data demanding the security, high-speed, and low-cost delivery, by prioritizing the usage of the leased line in transmitting this data. The line-switching facsimile modem of the present invention is connected to a facsimile machine and has a function to transmit data via the public switched telephone network. When transmitting a facsimile data from the facsimile machine, the switching unit checks whether a leased line address is registered in the memory unit or not, and if the leased line address is found registered, the switching unit switches the connection from the public switched telephone network line to the leased line, and then the facsimile data is transmitted using the computer interface via the leased line.

Line-switching facsimile modem apparatus and a facsimile modem connection method

A service replicating server replicates service per each network and shares data safely between networks such as an interoffice network and the internet. The LAN side server connected to the LAN and an internet side server connected to the internet share data at the shared disk which performs mutual exclusion using a bus having bus lock function and supplies a consistent service to each network by using the shared data.

Sharing data safely using service replication

Data transmission system and methods in which data is automatically selected based upon, the processing ability of a client and the condition of a data transmission line connecting a server and the client. A terminal attribute unit that collects ability characteristics of the client and a line controller that collects the transmission rate of the data transmission line are provided in the server. A data attribute provider provides a proper data type and data amount of transmitting data in a profile based upon the collected information about the client. A data transmission agent refers to a correspondence table and selects data having a proper data amount. Then, the data transmission agent transmits the selected data to the client.

Client-optimized data transmission system and method

The aim of the present invention is, as for a data communication among the nodes sharing, managing and maintaining the replicated data, to reduce the communication traffic by utilizing attributes of individual communication media. The application program of the node on the transmitting side inserts the data object into the data store, and the data synchronizer transmits an update message including the differential data and the log number. The node on the receiving side compares the log number of the update log data of its node and the log number of the update message it has received, and decides whether or not to adopt the update message.

Data synchronization method for maintaining and controlling a replicated data

The agent system sends both program and data together to a destination to perform execution, and the system is provided with agent re-execution and cancelling procedures, making mission critical application possible. The non-volatile memory area is prepared in the processing system where the agent is being processed to store the executed operation log.

Agent system

Data transmission system and methods in which data is automatically selected based upon the processing ability of a client and the condition of a data transmission line connecting a server and the client. A terminal attribute unit that collects ability characteristics of the client and a line controller that collects the transmission rate of the data transmission line are provided in the server. A data attribute provider provides a proper data type and data amount of transmitting data in a profile based upon the collected information about the client. A data transmission agent refers to a correspondence table and selects data having a proper data amount. Then, the data transmission agent transmits the selected data to the client.

A cache memory having four user memory areas in which different data in a main memory is to be respectively stored, and a system memory area in which shared data between programs in the user memory areas is to be stored. A data controller has a route register in which address information, such as information as to whether or not the data in the respective user memory area is replaceable and task information, is to be stored. The individual user memory areas are connected to one another via a cache internal address data bus and a user-area cache internal sub-address data bus. The internal bus is connected to a CPU bus and a memory bus via a memory management unit for performing address translation, etc.

Cache memory system having at least one user area and one system area wherein the user area(s) and the system area(s) are operated in two different replacement procedures

Growing community of inventors

Tokyo, Japan

Takashi Sakakura