Fujitsu Corporation

Koji Nakamichi

Toshio Soumiya

Naotoshi Watanabe

Takeshi Kawasaki

Kenya Takashima

Hitoshi Yamada

Michio Kusayanagi

Hiroshi Yamamoto

Satoshi Imai

Akiko Yamada

Akira Nagata

Yutaka Ezaki

Tomohiro Ishihara

Masato Okuda

Nobuhiro Kawamura

Kenichi Kawarai

Masafumi Katoh

Mitsunori Fukazawa

Katsuichi Nakamura

Seiji Nomiyama

Sugiko Itagaki

Toshiyuki Sudo

Hitoshi Ueno

Tetsuya Nishi

Akira Chugo

Kazunori Murata

Akiko Okamura

Takashi Iawasaki

Takashi Iwasaki

Toshio Somiya

A video quality monitoring method includes a distribution server measuring first video quality index values according to a full-reference method by comparing a video, distributed from the distribution server to a client through a network, with a degraded video, generated by causing multiple scenarios of quality degradation due to the network in the video in a pseudo manner, creating characteristic data of first quality degradation values, obtained by causing the quality degradation to vary with the scenarios at regular intervals, and the first video quality index values corresponding to the respective scenarios, and transmitting the characteristic data to the client; and the client measuring a second quality degradation value in the video distributed through the network, and calculating a second video quality index value, equivalent to a value according to the full-reference method, of the distributed video from the measured second quality degradation value and the characteristic data.

Video quality monitoring method, distribution server, and client

A system includes, in order to detect a failure occurring on a transmission path through which service traffic is transmitted from a delivery server, a node that is on the transmission path and that monitors the service traffic, and a monitoring server that determines a location at which a failure has occurred by analyzing information transmitted from the node. Each node measures the service traffic, recognizes an adjacent node, which is a node adjacent in a logic tree structure corresponding to a transmission path, establishes a link, recognizes a position of the node in the logic tree structure, sets a monitoring target link to be monitored in the logic tree structure, uses a measurement result, and transmits the estimation result to one of the adjacent node and the server. The server analyzes the estimation result received from the node, and determines the location of a failure on the transmission path.

Network failure detection system, method, and storage medium

A QoS information notification method for transmitting QoS information over a multi-domain network includes steps of: (a) a first inter-domain signaling apparatusA transmitting QoS information to a first communication apparatusA; (b) the first communication apparatusA transmitting the received QoS information to a second communication apparatusB; (c) the second communication apparatusB transmitting to a second inter-domain signaling apparatusB the received QoS information and a route through which the received QoS information has passed; and (d) the second inter-domain signaling apparatusB associating the received QoS information with the received route.

QoS information notification method, communication apparatus and inter-domain signaling apparatus for transmitting QoS information over a multi-domain network

A transmission system, having a plurality of delivery server side routers which communicate with a plurality of delivery servers for delivering a content; and a client side router which communicates with a client device for receiving the content, is configured to include: a database for storing server load states of the plurality of delivery servers, and respective individual link load states for a plurality of delivery paths between the plurality of delivery server side routers and the client side router; and a path control unit for determining a minimum load state delivery path having a minimum load state among the plurality of delivery paths, based on sums of the server load states and the respective individual link load states stored in the database.

Transmission system, delivery path controller, load information collecting device, and delivery path controlling method

A wide area load sharing control system includes a statistic information gathering module obtaining from respective nodes, as statistic information, a traffic state of links connected to the respective nodes in a network, a route determining module determining, based on the obtained statistic information, at least one route for extending a plurality of paths between ingress edge nodes and egress edge nodes that correspond to within a traffic engineering section in the network, and a load sharing determining module determining, based on the obtained statistic information, a ratio at which a traffic should be distributed to respective paths on the determined route. Active modules among the statistic information gathering module, the route determining module and the load sharing determining module are switched over to between the ingress edge nodes and the network control device concentratedly controlling the respective nodes, mutually.

Wide area load sharing control system

A statistical value update unit calculates the fluctuation of measurement data. A filtering processing unit extracts a normal white noise component from the fluctuation of the measurement data using an adaptive lattice filter. A statistical test unit determines whether or not the variance of the normal white noise component is out of a predetermined scope in reference distribution. A change decision unit detects a stationary change of the status of a target system based on a detection ratio of an outlier.

Status monitor apparatus

Included are a network information database for storing the statistical information collected from a router, a user request processing unit for accepting and processing a flow forwarding request from a user terminal connected to the network, a route control unit for searching for a route corresponding to the request from the user terminal by referring to the network information database, a load sharing control unit for executing such a load sharing process as to generate router setting information for sharing a transmission load of the network by referring to the network information database, and a router control unit for setting a router based on the route information determined by the route control unit and on the router setting information generated by the load sharing control unit.

Transmission bandwidth control device

In a storage management system and method which virtualizes a plurality of storage devices distributed over a network to be managed, a storage state manager, in a storage management server, manages a storage usage state in each storage device, a network state manager manages a traffic state of each network device, and a path searching/setup portion determines a storage data path to be set up in the network device based on the storage usage state and the traffic state. In a host, a virtualization mapper associates a storage space replied from the storage management server with a virtual storage, and a path information setup portion transmits/receives storage data with the storage data path.

Storage management system and method

The present invention relates to distributing the load between the set routes among a plurality of routes between a communication apparatus which serves as a start point to another communication apparatus which serves as an end point. An apparatus provided in a router in a network collects traffic characteristics of transmission paths connected to the router, notifies other routers of the collected traffic characteristics, calculates load based on the collected traffic characteristics, decides based on the calculated load information whether or not a transmission path should be added or deleted, and equalizes the load among the plurality of transmission paths.

Transmission path controlling apparatus and transmission path controlling method as well as medium having transmission path controlling program recorded thereon

The present invention provides a traffic information collecting device and method. A node in a communication network collects a first traffic information of a first link connected to an own node. And also the node receives second traffic information of second links connected to the other nodes. The second traffic information is transmitted from the other nodes. The node stores the first and second information. In consequence, the node can be informed of the conditions of the traffic of each link in the communication network based on the stored information. As the result, it becomes possible to control the load sharing in correspondence to the conditions of the traffic.

Device and method for collecting traffic information

An L bit for notifying another router of whether a self-router belongs to a connection-oriented network is newly provided in the options field of a conventional OSPF packet and the OSPF packet, including L bit is transmitted to another router. In this way, each router belonging a network can automatically recognize a router belonging to a connection-oriented network by detecting L bit. Then, by generating a routing tree, a connection-oriented network device can be identified in the routing tree and mapping between a connection-oriented network and a connectionless network can be performed in an edge device.

Routing information mapping device in a network, method thereof and storage medium

A packet flow control apparatus performing flow control of packets each having variable length, includes: a buffer memory for temporarily accumulating arrived packets until a sending time of each packet; a counter updated based on a rate determined in accordance with a packet length calculated by a counter value of the counter and limited flow of packets; a sending time determining section for determining the sending time of each packet based on the counter value and a present time; and a sending order control section for managing a sending order of each packet accumulated in the buffer memory, and for sending a read instruction of each packet to the buffer memory, based on the sending time determined by the sending time determining section.

Packet flow control apparatus and a method for controlling the same

A method and apparatus for selecting paths to route incoming traffic through a data communication network, which is capable of effectively dispersing the traffic load to the selected paths on the network and effectively optimizing the use of network resources. In a communication network, a plurality of label switched paths between an ingress node and an egress node are provided. Incoming traffic at the ingress node is labeled and delivered through the network to the egress node. In a method and apparatus for selecting paths to route the incoming traffic through the network, a plurality of forwarding equivalent class elements (FEC) of the incoming traffic at the ingress node are allocated for the plurality of label switched paths. The labeled traffic is delivered on the plurality of label switched paths on an FEC-element basis so as to route the labeled traffic through the network to the egress node. The traffic load on the respective label switched paths can be effectively dispersed and the sequence of data packets, sent by the same terminal, may be maintained.

Method and apparatus for selection of paths on a communication network

A boundary apparatus on the transmission side provided on the boundary between an IP network accommodating a transmitting terminal and an ATM network separates the requests for bandwidth which are received from receiving terminals via boundary apparatuses on the reception side into a plurality of groups on the basis of a required bandwidth, establishes a point-multipoint connection between the boundary apparatus on the transmission side and each of the boundary apparatuses on the reception side for each group, and transmits the data from the transmitting terminal to each of the receiving terminals via the connection. When there is a change in the number of the requests for bandwidth due to the delivery of a new request for bandwidth or the interruption of a flow of requests, the boundary apparatus on the transmission side calculates the effective bandwidth allocation ratio of the group in which there is a change in the number of the requests for bandwidth, and if the effective bandwidth allocation ratio is not more than a preset value, the boundary apparatus separates the requests belonging to the group into two groups, and establishes a connection for each group.

Growing community of inventors

Kawasaki, Japan

Koji Nakamichi