Hitachi, Ltd.

Nippon Telegraph and Telephone Corporation

Hitachi Ulsi Engineering Corp.

Morihito Miyagi

Takahiko Kozaki

Manabu Okamoto

Akihiko Takase

Yoshihiro Ashi

Masahiko Mizutani

Masaru Murakami

Katsuyoshi Tanaka

Yozo Oguri

Yutaka Ito

Koji Watanabe

Shinichi Akahane

Hiroki Ikeda

Mutsumi Hosoya

Toshikazu Nishino

Kazuyoshi Hoshino

Junichirou Yanagi

Yasushi Takagi

Makoto Kitani

Hitomi Nakamura

Shigeaki Kinoshita

Willy Hioe

Kenichi Oka

Nobuko Miyagi, Legal Representative

In a packet communication network comprising an MNO network, and an MVNO network including an application server for providing an information service to wireless terminals via the MNO network, the MNO network includes a subscriber-associated-information delivery controller for delivering subscriber associated information of each wireless terminal, which is connected to a radio access network, to the MVNO network, and the MVNO network includes a subscriber-associated-information processor for receiving the subscriber associated information delivered from the subscriber-associated-information delivery controller.

Packet communication network and subscriber-associated-information delivery controller

A content relay node comprising a data processing unit for storing or transmitting a data packet on the basis of the data attribute, a storage connected to the data processing unit, transmitting units each for processing the header of a data packet in accordance with a control signal from the data processing unit and transferring the data packet to a neighboring relay node, and a routing control unit for selecting the transmitting unit or the data processing unit as a destination of a data packet on the basis of routing information including a storage address, wherein the storage unit stores a copy of a data packet at least until transfer of the data packet to the next node is completed.

Method and system for content-oriented routing in a storage-embedded network

A secure storage system for securely accessing a storage device on a network and improving volume management scalability, consisting of a client having a VPN capability; a storage device in an SAN; a management apparatus having a means for managing a storage capacity and a logical volume allocated to the storage device; a converter for converting a protocol used in the SAN to a protocol used in a LAN/MAN/WAN and vice versa; and a conversion apparatus having the VPN capability. A VPN is provided between the client and the conversion apparatus. The conversion apparatus is provided with a mapping between the VPN and an access range of the storage device. A VPN-ID is used for identifying the VPN. An address in the logical volume is used for the access range of the storage device.

Secure storage system

An ATM switching system includes PVC allocation circuits-i corresponding to output queues-i is disclosed. At the time of arrival of the leading cell of each burst data, if the output line has a room, the PVC of the burst data is stored as information for admission and identification. The subsequently-arriving cells having the same PVC identification information as the stored identification information are 'input to an output buffer, and the cells of the remaining burst data are all discarded. Even when a plurality of burst data compete for the same output line, the fact that all the cells other than the first-arriving admitted burst data are discarded prevents the cells from being input other than within a predetermined bandwidth and localizes the burst data affected by the cell discarding due to output queue overflow.

ATM switching system and cell control method

An ATM switching system which includes PVC allocation circuits corresponding to output queues. At the time of arrival of the leading cell of each burst data, if the output line has room, the PVC of the burst data is stored as information for admission and identification. The subsequently-arriving cells, having the same PVC identification information as the stored identification information are input to an output buffer, and the cells of the remaining burst data are all discarded. Even when a plurality of burst data compete for the same output line, the fact that all the cells other than the first-arriving admitted burst data are discarded prevents the cells from being input other than within a predetermined bandwidth and localizes the burst data affected by the cell discarding due to output queue overflow.

An ATM switching system which includes PVC allocation circuits corresponding to output queues. At the time of arrival of the leading cell of each burst data, if the output line has room, the PVC of the burst data is stored as information for admission and identification. The subsequently-arriving cells having the same PVC identification information as the stored identification information are input to an output buffer, and the cells of the remaining burst data are all discarded. Even when a plurality of burst data compete for the same output line, the fact that all the cells other than the first-arriving admitted burst data are discarded prevents the cells from being input other than within a predetermined bandwidth and localizes the burst data affected by the cell discarding due to output queue overflow.

An asynchronous transfer mode switching system for improving switching throughput and averting complicated and difficult timing design. In operation, synchronous cell strings from external transmission lines are converted to asynchronous cell strings which are switched by a space-division switch array. The switched asynchronous cell strings are reconverted to synchronous cell strings for output onto external transmission lines. The space-division switch array comprises a plurality of unit switches in stages, each unit switch having input terminals and output terminals. The unit switches each include a timing control circuit that causes a switching operation to start upon detecting two states concurrently: a stored state of a cell to be switched, and a storage-ready state of a destination for the switched cell. The scheme allows the system to operate in an asynchronous manner.

Asynchronous transfer mode switching system

Apparatus for executing the connection admission control for PVC and SVC efficiently in an ATM network system which includes a network management equipment and a network equipment. The control function of the network management equipment executes resource allocation to PVC and SVC and notifies the network equipment of resource management information for SVC. For a request of PVC setup, the control function of the network management equipment executes the connection admission control for PVC and notifies the network equipment of the admission result. For a request of SVC setup, the network equipment executes the connection admission control for SVC. Communication overhead is reduced since it is not necessary to inquire the network equipment about connection admission from the network management equipment during PVC setup. Furthermore, the network equipment can count call blocking of SVC.

ATM network system and connection admission control method

An ATM switching system which includes PVC allocation circuits corresponding to output queues is disclosed. At the time of arrival of the leading cell of each burst data, if the output line has room, the PVC of the burst data is stored as information for admission and identification. The subsequently-arriving cells having the same PVC identification information as the stored identification information are input to an output buffer, and the cells of the remaining burst data are all discarded. Even when a plurality of burst data compete for the same output line, the fact that all the cells other than the first-arriving admitted burst data are discarded prevents the cells from being input other than within a predetermined bandwidth and localizes the burst data affected by the cell discarding due to output queue overflow.

In an asynchronous transfer mode (ATM) network, if an originating terminal notifies necessity or unnecessity of transmitting a fault notification signal through a call set-up message, the content of the notification is notified to respective node devices on a target virtual path (VP) in the procedures of transmission/reception of a call control message. Each of the node devices makes a virtual channel (VC) table of a line interface 100 corresponding to the VP store the information indicating necessity or unnecessity to transmit a fault notification signal. When a fault arises in the VP, one of the node devices on the downstream side detects the fault, its interface connected to the fault VP sees the VC table and determines the necessity or unnecessity of fault management operation and maintenance (OAM) cell support with respect to respective VCs multiplexed on the fault VP, so as to issue a fault management OAM cell with respect to only VCs regarded as necessary.

Node device and alarm notification control method for ATM network

A cell multiplexer includes a multiplexing unit for time-divisionally multiplexing ATM cell signals given from a plurality of input lines, a write controller for storing cell signals outputted from the multiplexing unit in a buffer memory successively correspondingly to the input lines, a read controller for reading the cell signals stored in the buffer memory from the buffer memory in the form of data blocks synchronized with an ATM cell structure, and a cell delineation controller for detecting delineation states of the data blocks read out from the buffer memory, notifying the read controller of delineation control information corresponding to a result of the detection and transmitting data blocks read out in synchronism with a predetermined cell structure to the output line selectively, wherein the read controller determines the read beginning addresses of data blocks to be read out nextly correspondingly to the input lines on the basis of the delineation control information notified by the cell delineation controller.

Cell multiplexer having cell delineation function

A usage parameter control and performance monitoring apparatus used for cell stream in an ATM network monitoring the performance of cell streams in includes a UPC unit for receiving an input cell stream and executing the UPC processing of the input cell stream; and receiving unit the for receiving the input cell stream and monitoring the performance of said input cell stream in accordance with a performance monitoring cell stream corresponding to the input cell stream received by said UPC unit, as a consequence, cell stream not subjected to the UPC processing are checked by corresponding performance monitoring cell stream, and performance calculations of cell loss, cell misinsertion, bit error, etc., are calculated for the cell stream subjected to the UPC processing.

Usage parameter control and performance monitoring apparatus used for

A defect notification method and apparatus for use in a multipoint ATM network so as to avoid the transmission of defect notification cells in an overlapped manner. In the invention when a connecting point detects a defect in a lower layer and when the connecting point is not a branching point the connecting point sends a first defect notification signal in the downstream direction of a first connection. When the connecting point receives the first defect notification signal and when the connecting point is a branching point, the connecting point terminates the first defect notification signal, sends a quasi-defect notification signal in the downstream direction of the first connection, and returns a second defect notification signal in the downstream direction of a second connection in the opposite direction of the first connection. Connecting points in the downstream direction of the first connection transfer the quasi-defect notification signal in the downstream direction of the first connection without processing and end points, upon receiving the quasi-defect notification signal, execute a predetermined state transition.

Growing community of inventors

Kodaira, Japan

Morihito Miyagi