Fujitsu Corporation

Akihisa Erami

Ryoko Tamura

Shinichi Ishigaki

Masayuki Koga

Ki Shu

A first node selects a selection node that is the send source of a packet with the highest received radio wave intensity from among packets received from a plurality of second node. The first node sends, to the selection node, a report packet that stores therein an identifier that specifies each of a plurality of first nodes and whose destination is a third node. The second node adds an identifier that specifies each of the plurality of second nodes to the report packet that was received from the first node with the received radio wave intensity that is equal to or greater than a predetermined value among the report packets which are transmitted by the plurality of first nodes and relays the report packet to the third node. The third node detects a node corresponding to the identifier that is not included in the report packets received.

Wireless communication method, node, and monitoring node

A transmitting sequence changing/restoring unit receives, from an ATM control unit, ATM cells stored with the transmitting target information in a segmented state. The transmitting sequence changing/restoring unit groups the cells of this cell string by fours, adds the synchronous cell to the head each group, and changes the sequence thereof. The respective cells are transferred in the changed sequence in sections ranging from the transmitting sequence changing/restoring unit of the transmitting-side ATM node to the unit of the receiving-side ATM node. Accordingly, even if the ATM cell string is intercepted by the third part in this section, this third party cannot reproduce the original transmitting target information. The transmitting sequence changing/restoring unit of the receiving-side ATM node is capable of recognizing where the groups of the received cell string are delimited based on the synchronous cells and restoring the sequence of the ATM cells within the thus recognized group, whereby the transmitting target information can be reproduced.

System and device for preventing wiretap

A broadcast control system and its components capable of determining unique routes to deliver broadcast cells to every destination in an ATM network, which is designed to avoid network congestion and subsequent degradation in quality of service, as well as to reduce the workloads imposed on network equipment. The ATM network is organized by a plurality of network elements and at least one service provider terminal connected to a source network element. A broadcast routing controller disposed in the source network element distributes a broadcast routing control cell over the ATM network. Each network element on the network receives this broadcast routing control cell as well as its replicas delivered through different paths, and on the basis of information contained in those control cells, it establishes its own routing data in the local storage. This routing data indicates a particular link that is connected to the shortest path between the source network element and the present network element. When relaying broadcast cells, each network element selectively accepts broadcast cells coming through a particular link registered in the routing data and redistributes them to adjacent network elements.

Broadcast control system, network element, and switching node apparatus with broadcast cell routing capabilities in asynchronous transmission mode network

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Fukuoka, Japan

Akihisa Erami