Fujitsu Corporation

Norihito Nishimoto

Tatsuya Soneda

Tadashige Iwao

Tetsu Yamamoto

Yoshihiro Watanabe

Junichi Yamazaki

Yoshiharu Sato

Kazuhiro Muraoka

Seiji Tokunaga

Shunji Abe

Toshio Soumiya

Taiji Kondo

Kazuo Hajikano

Toshio Shimoe

Yuichi Inao

Junji Tagane

Kensuke Kubo

Yoji Tsuboi

Akio Yonehara

A selection device is selected from a first group in a first cluster. The node devices of the first group can communicate with a node device in a second cluster adjacent to the first cluster. The selection device performs transmission and reception of a report frame that reports an identifier of a node device included in the first group. The selection device selects from the first group a first relay device that relays a relay frame used for a communication between a node device in the first cluster and a node device in the second cluster. The first relay device determines anode device adjacent to the first relay device to be a second relay device that relays the relay frame to a node device in the second cluster.

Communication method and node device for communication between adjacent clusters

A node apparatus includes a TTL memory configured to store a TTL value for a first node apparatus in the cluster; a receiving unit configured to receive a first Hello packet including a first sequence number and a second Hello packet including a second sequence number that is incremented when the node apparatus transmits a Hello packet; a sequence number judging unit configured to judge whether a first sequence number and a second sequence number match each other; a TTL decrementing unit configured to perform a process to decrement the TTL value stored in the TTL memory, when the first sequence number and the second sequence number are identical according to a judgment; and a cluster information updating unit configured to separate the first node apparatus from the cluster, when the TTL value for the first node apparatus becomes equal to or smaller than a prescribed value.

Node apparatus and communication method

A node apparatus in a network including a plurality of node apparatuses includes: a cluster information memory configured to store apparatus identification information of node apparatus included in a first cluster including the node apparatus; a merge cluster node number determination unit configured to obtain the number of node apparatuses included in the second cluster based on information included in the hello packet upon receipt of a hello packet from one of adjacent node apparatuses included in a second cluster, and to determine whether a sum of the number of node apparatuses included in the first cluster and that of node apparatuses included in the second cluster is equal to or smaller than a maximum number of cluster nodes; and a cluster merge processing unit configured to merge the second cluster with the first cluster based on a result of the determination.

A node device includes a transmitter, processor, and a receiver. The receiver receives a packet from an adjacent node device. The processor generates a cluster list and a first hello packet. The cluster list records device identification information of a node device included in a cluster. The cluster is a group of node devices for which route information is stored. The first hello packet reports the route information with cluster identification information of the cluster. The transmitter broadcasts the first hello packet. Upon receipt of, from a free-node device that does not belong to a cluster, a second hello packet that includes information that associates the cluster identification information with device identification information of the free-node device, the processor adds the device identification information of the free-node device to the cluster list until a number of node devices recorded in the cluster list reaches a threshold.

Node device and communication method for generating cluster

A network includes node devices each storing a table that manages paths to plural gateway devices for connecting to another network. A node device generates a hello frame for specifying a main gateway device of the node device at a predetermined timing, and transmits the hello frame to adjacent node devices. The node device, upon receiving a hello frame from an adjacent node device operating as a first hop destination of a data frame destined for the main gateway device, determines whether quality of a path to the main gateway device is lowest among paths to the plural gateway devices, based on path quality information included in the hello frame. When the quality of a path to the main gateway device is lowest, the node device changes the main gateway device to a gateway device that is registered in the table and specified by information included in the hello frame.

Apparatus and method for determining an optimum gateway node in a communication network

A method and a system for seizing at least one communication channel for use in a first call. Information on a plurality of states of a plurality of communication channels are held in an channel-state-information holding unit. Based on the information on the states of the communication channels, at least one optimum communication channel from among the plurality of communication channels is determined as the at least one communication channel, and seized for use in the first call. The determination is made so that after the above determination and seizure for the first call, consecutive communication channels for use in a second call can be successfully seized with high probability. Further, when consecutive communication channels are required for the first call, and not immediately available, the at least one optimum communication channel may be secured by vacating one of the plurality of communication channels used in an existing call, and allocating an idle one of the plurality of communication channels to the existing call.

Method and system of seizing communication channel enhancing usability of remaining communication channels

A network includes a plurality of exchanges and a service station which carries out network services. Each exchange of the plurality of exchanges and the service station are connected through a call control signal line. Respective exchanges of the plurality of exchanges are connected through circuits. Each exchange of the plurality of exchanges includes a virtual-index capture processing portion which captures a virtual circuit identification index, and the exchange specifies the virtual circuit identification index and makes a call-out request to the service station.

Network call control system

A correct admission decision can be made even when not relying upon traffic characteristics declared by a user. With respect to each of established connections, traffic data are acquired and are stored. When a call request is issued, an admission decision is made using the traffic characteristics if the traffic characteristics are stored.

Call admission control in ATM network

A transmission line control processor performs various processes in response to requests of a call processor for capture, allotment, and release of a subscriber line or an inter-station line. Additionally, in response to requests of the call processor for a reservation, connection, and disconnection of a path, the transmission line control processor instructs an ATM switch to connect or disconnect the path. These processes can be performed using with the existing functions of ordinary call processors, and such complicated processes as the management of bands at ATM switches are executed exclusively by a transmission line control processor.

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Fukuoka, Japan

Norihito Nishimoto