Hitachi, Ltd.

Other

Nippon Telegraph and Telephone Corporation

Fujitsu Corporation

Hitachi Vlsi Engineering Corp.

Hitachi Ulsi Engineering Corp.

Hitachi Communication Systems, Inc.

Hitachi Communication System, Inc.

Akihiko Takase

Kazuho Miki

Masahiro Takatori

Noboru Endo

Takahiko Kozaki

Masaru Murakami

Junichirou Yanagi

Tetsuro Yoshimoto

Hajime Abe

Ryoji Takeyari

Atsushi Takai

Masao Kunimoto

Koji Wakayama

Yoshitaka Takasaki

Yoshihiro Ashi

Yukio Nakano

Yoshito Sakurai

Setsuo Takahashi

Kenichi Sakamoto

Norihiko Moriwaki

Takashige Baba

Morihito Miyagi

Shirou Tanabe

Akio Makimoto

Yozo Oguri

Kazumasa Yanagisawa

Naoaki Yamanaka

Yukiko Takeda

Kazuma Yumoto

Katsuyuki Imoto

Katsuyoshi Tanaka

Masataka Takano

Toshiya Oouchi

Shigeo Shinada

Nobuo Ogasawara

Kota Miyoshi

Yoji Oka

Satoshi Aoki

Yasushi Takahashi

Takao Ogura

Shinobu Gohara

Daisuke Matsubara

Minoru Maeda

Mutsumi Hosoya

Hideaki Tsushima

Toshikazu Nishino

Toshiaki Tarui

Atsushi Kiuchi

Takashi Mori

Hirohisa Sano

Takafumi Chujo

Yusuke Mishina

Shiro Tanabe

Mitsuhiro Takano

Yasusi Kanada

Shigeo Amemiya

Michio Kusayanagi

Yoichi Sato

Tatsuhiko Miyata

Naoya Kobayashi

Yasushi Sawada

Hiroshi Takeo

Masahiro Koya

Takaaki Toyama

Youichi Sato

Tatsuo Mochinaga

Shoji Yamada

Kaori Nakayama

Yoshiaki Takemura

Takashi Nakashima

Tsutomu Yoshiya

Willy Hioe

Katuyoshi Tanaka

Mituhiro Takano

Kazuhiko Hohara

Tetuhiro Okabe

Kiyoshi Saitou

Kaori Kawabata

Kenji Ochiai

Misato Mochizuki

Hitoshi Yajima

There is a need to generate a virtual network across multiple physical networks without the need for users to understand information about the respective physical networks. A network system includes: multiple communication systems for communication with a user; multiple physical network management servers that manage multiple physical networks including multiple routers; and a virtual network management server that manages a virtual network connecting the communication systems with each other through the physical networks. The virtual network management server acquires physical network configuration information. The virtual network management server generates management information in order to manage the physical networks as one abstraction network. The virtual network management server configures the abstraction network by transmitting the generated management information to each of the physical network management servers and the routers.

Virtual network and management method of virtual network

Interdomain federation, generation or management of a virtual network (slice) that extends among domains can be performed without changing a function of a server or a node of a network domain without a function to manage the other domain. Pseudo node receiving a management message with the same protocol as a general node is added, in interdomain management information from an own domain, the other domain part in management information is received as the management information by the pseudo node (the other domain part is concealed) and when interdomain management information is transmitted to the other domain through the pseudo node by a federation protocol and the pseudo node and the interdomain management information is received from the other domain, the other domain part in the management information is bound as the management information of the pseudo node and transmitted to a management server of own domain.

Method for managing network system

There is provided a load distribution function that enables an application of a user to be freely allocated to a machine even if an address of a terminal or the application used by the user is duplicated between VPNs for each user. An access detector of a machine allocation device detects a start packet from received communication packets, and determines the type of the start packet and the type of the application used by the terminal. A machine allocation manager determines a machine on which the determined application operates, and operates the machine. A network manager configures a user virtual network on a second virtual network between the determined machine and the machine allocation device.

Network system, machine allocation device and machine allocation method

When connecting a plurality of packet processing parts each having a packet processing function as an added function of a virtual network for each user, there was a problem that the number of packet processing units that were connectable, a function of analyzing a communication packet, etc. were dependent on a transport technology of a core network of a virtual network. A communication system including the packet processing unit for performing an information processing of the communication packet on the virtual network has a virtual network system for the packet processing unit in addition to a wide area core network in a wide area network service.

Communication system and control method for communication system

A communication entrepreneur has an application serverhaving message conversion function. The application serverperforms service function distribution processing with reference to trigger ruleand message rule. The communication entrepreneur can provide various service functions without notifying individual server addresses to a service entrepreneur.

Communication system, application server and communication method for server cooperation

A cooperating system includes a web server and a communication service control server, where information of an error in a communication network is not notified until the web server makes an inquiry to the communication service control server. To solve this problem, a communication system is configured to include a session control server for controlling communication sessions from/to a plurality of terminals, an application server for communicating with the session control server, a web server for communicating with the application server, and a network for coupling the session control server, the application server and the web server. The application server is configured to transmit status related information including information on each communication session status of the plurality of terminals to the web server. The web server is configured to detect each communication session status of the plurality of terminals based on the received status related information.

Communication system

Upon initialization, a VPC is set up between edge nodes. A control processor of each node creates an IP address/VPC mapping table using IP routing information and an address mapping table mapping correspondence between IP addresses and ATM addresses and supplied by a network management system. A gateway assigns a VCC to each packet input to the network. A sending-side edge node inputs the packet to the VPC corresponding to its destination by referring to the IP address/VPC mapping table. A transit node performs packet switching over VP. A receiving-side edge node transfers each packet to the gateway corresponding to its destination. If a series of packets meet a predetermined condition in a given edge node, its control processor sends VCC information to input interfaces of the edge node so that the packets are switched by an ATM switch in the edge node without intervention of the control processor.

Packet switching system, packet switching network and packet switching method

An optical frequency division multiplexing network includes first optical communication paths connected to terminals, respectively, a second optical communication path connected to the outside and a node composed of a selection unit for selecting signals having optical frequencies to be sent to the plurality of terminals, respectively, from signals transmitted through the second optical communication path in optical frequency division multiplexing, a conversion unit for converting the selected signals into signals having a single optical frequency and an output unit for producing the converted signals to the terminals through the first optical communication paths, respectively.

Optical frequency division multiplexing network

This invention provides a network management equipment and a packet switching equipment which eliminate a connection setup delay time, reduce a delay and a delay variation involved in data transfer, and effectively perform connectionless data flow processing in a large data network. The network is divided into a connection-oriented core network and a plurality of connectionless access networks connected to the core network where a plurality of connections (called permanent virtual route (PVR)) are set up among a plurality of edge nodes. The network management equipment selects one route from a plurality of PVRs for connectionless data flow received from one of the access networks and transfers data along the PVR.

Packet switching network, packet switching equipment and network management equipment

In a communication network having a communication node connected to a plurality of service providers' networks, a network controller connected to the communication node, and a server for supplying network control information to the network controller, the server stores definition information of communication services provided by the service providers. When a service request specifying a communication path to be assured is received from the user terminal, the server retrieves communication service definition information matched with the service request and notifies the search result to the user terminal. In response to a notification of agreement from the user terminal, the server transmits network control information for setting a communication path to the network controller and the network controller supplies communication path control information generated on the basis of the network control information to the communication node.

Assistant server and path connection control method for service provider's network

In a system in which communication is performed among a plurality of devices having a mechanism of disassembling a packet into ATM cells to send them and a plurality of devices having a mechanism of assembling the received ATM cells into the packet, a frame is prevented from being lost owing to change of virtual connections in the course of transferring the frame, improving reliability of the communication on the packet level. When the switch receives a request for change of switching, it does not processes that request at once, but confirms that the cell located at the boundary of the frame has been processed, before processing the change request, so as to protect the frame. When the switch receives a request for change of switching, it protects a frame by multicasting the cells to both destinations before change and after change, for a given period of time.

IP switch, interface circuit and ATM switch used for IP switch, and IP switch network system

A router apparatusis provided with an ATM switch, an IP controller for performing routing control as a controller for layer, plural kinds of interfaces which are individually provided to plural transmission paths in which various communications are performed, and a cell multiplexing/demultiplexing unit, and manages the cell communications between respective parts on the basis of identification information. The input packet is subjected to IP processing in an interface to be converted to a cell in a common format, and the cell is serially multiplexed with a cell from another interface on a cell basis, and transmitted to the ATM switch at the cell multiplexing/demultiplexing unit. Each interface and each cell multiplexing/demultiplexing unit sets and switches the identification information for the header portion of the packet and the cell to be communicated by using a table in which the corresponding relationship of the identification information is registered.

Router apparatus using ATM switch

Packet switching network, packet switching equipment, and network management equipment

Growing community of inventors

Tokyo, Japan

Akihiko Takase