National Institute of Information and Communications Technology, Incorporated

National Institute of Information and Communications Technology, Incorporated Administrative Agency

Tokyo University of Science Foundation

Mikio Hasegawa

Masugi Inoue

Homare Murakami

Khaled Mahmud

Udana Bandara

Hiroyuki Morikawa

Akira Idoue

Hidetoshi Yokota

Takeshi Kubo

Kenji Leibnitz

Kaori Kuroda

Ferdinand Peper

Tetsuya Shimokawa

Masugi Nat Inst Information & Comm Tech Inoue

A communication method includes generating at a first node, a message of a predetermined message temporal length that indicates an input value to be encoded and transmitting, at the first node, a signal including a pulse train corresponding to the generated message. The signal including the pulse train includes two pulses that define start and end of the message, respectively, and further two pulses that define within the message, a first time interval calculated from the input value in accordance with a first function and a second time interval calculated from the input value in accordance with a second function, respectively.

Communication method and network system

An analog signal input/output system in which an analog signal input terminal converts an input analog signal to a digital signal and transmits the digital signal to a host computer via a network, while a digital signal generated by the host computer is transmitted through the network to an analog signal output terminal and converted therein to an analog signal to be outputted. Two connections of upstream and downstream sockets between the host computer and the analog signal input/output device. These connections are selectively used to provide communication of control signals and data. Exemplary analog signals include input signals from a microphone, output signals to a speaker, and input/output data to/from a sensor, a measuring device and the like.

Analog signal input/output system using network links

The present invention is a wireless communications system for simultaneously establishing a basic access network and a wireless access network using at least two kinds of wireless communication networks. The basic access network executes signaling communication in which communication is controlled so as to be continuously switched, whereas the wireless access network executes data communications other than the signaling communication. According to the system of the present invention, networks can be continuously switched by setting multicast for temporarily flowing data to the basic access network.

Wireless communications system

A location information server system for acquiring the status of a user terminal in wireless communication network, comprising: a plurality of sensor means capable of communicating through a network; a priority database to location information from each sensor means; location information selecting means for selecting a location information having a high priority from overlapping location information with reference to the database; and a sensor information integration processing means which integrates acquisition information from at least two sensor means of the sensor means for acquiring the location information and the sensor means for acquiring identification information of a user terminal, and acquires the user terminal position wherein information from each means is accumulated in the location information server as terminal location information database and the location information server means includes a location information providing means capable of providing the sensor information to a predetermined network server which switches communication in the user terminal.

Location information server system and wireless communication system using the same

A gateway (GW) and a plurality of foreign agents (FA) are connected in a ring-like manner, and the procedures of (1) the GW receiving an IP packet, addressed from a corresponding node CN to a mobile node MNa; (2) the GW transferring the packet to a link Lin one direction; (3) an FAtransferring the received packet to a link Lin the same direction; (4) FAfurthermore transferring the received packet to a link L, connected to MNa, if the destination address of the received packet is already registered in the visitor list; (5) an FAtransferring the received packet to a link Lin the same direction; (6) FAfurthermore ending the process as it is if the destination address of the received packet is not registered; and (7) the GW discarding the received packet.

Mobile network and communication method thereof

It is an object of the present invention to provide a communication system to provide a communication system which requires no special application for a correspondent node and has a service handoff function enabling a transfer destination terminal device to be freely used, and its configuration equipment. In order to realize this, the communication system includes a correspondent node delivering communication data which can be executed by a predetermined application, a proxy server device which receives the communication data from the node to execute the application, and transfers the service to a transfer destination terminal device, the transfer destination terminal device outputting the service, and a user terminal device, wherein the user terminal device transmits control information to the proxy server device, and thereby the proxy server device switches the transfer destination terminal device to perform service handoff.

Communication system having service hand-off function, user terminal device, transmission destination terminal device, and proxy server device

The present invention is a wireless communications system for simultaneously establishing a basic access network and a wireless access network using at least two kinds of wireless communication networks. The basic access network executes signaling communication in which communication is controlled so as to be continuously switched, whereas the wireless access network executes data communications other than the signaling communication. Then, a wireless communication terminal is provided with a position obtaining means and sends position information to a server, thereby it is possible to switch to an optimum network.

Wireless communication system for switching different wireless communication networks

The present invention is a wireless communications system for simultaneously establishing a basic access network and a wireless access network using at least two kinds of wireless communication networks. In the basic access network, there are executed signaling communication for obtaining available network information based on the position information of a terminal and communication by SIP (Session Initiation Protocol) for executing exchange of a subscribe request signal between terminals and negotiation of communication. This arrangement makes it possible to connect between terminals by a media application on peer to peer.

Growing community of inventors

Tokyo, Japan

Mikio Hasegawa