Fujitsu Corporation

Tsuguo Kato

Ryuichi Takechi

Hideaki Ono

Hiroshi Tomonaga

Kenichi Kawarai

Naoki Matsuoka

Keiichi Nakatsugawa

Takayuki Sasaki

Hiroshi Sasaki

Hitoshi Yamada

Masafumi Katoh

Masaaki Wakamoto

Yutaka Ezaki

Mitsuharu Amano

Masakatsu Nagata

Tomohiro Ishihara

Kohei Iseda

Yoichiro Igarashi

Tetsuaki Wakabayashi

Naoki Matuoka

A base station unit of a communication device generates control information identical with those generated by other communication devices. The control information includes information defining regions in a radio frame that are used by the communication device and the other communication devices to transmit data. A terminal unit receives data in accordance with the control information. A switching unit changes the connection among the base station unit, the terminal unit and an antenna. When the control information is output from the base station unit, a switch controller operates the switching unit so that the base station unit may be connected to the terminal unit to output the control information to the terminal unit.

Communication device and method for internally redirecting control information

A network/service control method comprises a step of acquiring, when providing a communication service to a user, a user context defined as knowledge information about the user associated with an environment surrounding the user and a past behavior pattern of the user, a step of acquiring a user profile defined as information about a user's favorite registered previously by the user at arbitrary timing, and a service control step of determining network requirements for providing the communication service on the basis of the user context and the user profile.

Network/service control method

This invention is to enable appropriate routing based on transition prediction of network traffic. This routing control method includes: reading out predicted utilization transition data (e.g. utilization rate, or utilized bandwidth) associated with a received connection set-up request from a predicted utilization transition data storage storing said predicted utilization transition data for each resource (e.g. links between routers, or server) in a network in future; and selecting a resource satisfying a predetermined condition based on the read predicted utilization transition data. Thus, by using said predicted utilization transition data, an appropriate resource is identified in accordance with future time transition of the resource utilization rate, for example, and thereby, appropriate routing is possible. For example, when a link that a traffic volume will increase after a predetermined time exists, it is possible to judge that such a link is not used even when there are a lot of available bandwidths now.

Routing control method, apparatus and system

An input line interface device that is used to accommodate packets from a high-speed line efficiently and to reduce a processing load on a back stage caused by routing control. A packet allotting section divides a variable-length packet, allots divided packets to parallel lines, and outputs the packets. A flow group classifying section classifies the packets into flow groups on each of the parallel lines. A sequence number giving section gives the packets sequence numbers corresponding to or independent of the flow groups. A buffering section stores the packets to which the sequence numbers have been given in a buffer or reads out them from the buffer to exercise sequence control over the packets in the flow groups. A flow separating switch separates the packets according to the flow groups and outputs the packets.

Input line interface device and packet communication device

The present invention concerns a mobile packet communication system that supports data communications, including Internet communications, in a high-speed mobile communication system such as a cellular communication network, and integrates a mobile network and a fixed network on a common platform while providing the capability to select an optimum route. Location registration servers--to--each store in a one-to-one fashion the addresses of subscriber nodes--to--currently serving mobile terminals--to--each assigned a packet address, or store in a one-to-one fashion the addresses of gate nodes--to--connected to fixed equipment--to--each assigned a packet address, and a transmitting node, which is a subscriber node or a gate node, temporarily stores a receiving node address reported from the corresponding one of the location registration servers--to--, and transfers subsequent packets directly to the receiving node by using the temporarily stored receiving node address.

Mobile packet communication system

The present invention provides a mobile communication network system comprising a first mobile communication network having a plurality of routers, a second mobile communication network having a plurality of routers, and a mobile communication terminal. A router located in an end section of a communication area of the first mobile communication network sends an end message indicating that it is located in the end section, to the mobile communication terminal. The terminal initiates communications with a router of the second mobile communication network, whilst the terminal is communicating with the router located in the end section, upon receiving the end message sent by the router located in the end section.

Router and mobile communication terminal for mobile communication network

A short cell multiplexer includes a sequence designating unit, in which reading intervals corresponding to QOS classes are set in respective reading interval setting registers. A counter memory is stored with the number of timings at which the short cells can be read. The sequence designating unit specifies the QOS class in which the number of timings reaches the reading interval on the basis of the reading interval and the number of timings, and gives to a reading unit an indication of reading the short cell belonging to this class.

Short cell multiplexer

A mobile node adapted router and home agent router operating by the IPv6 protocol able to shorten the time required for updating the current address of the mobile node and increase the speed of switching of the transfer route and providing a transfer route not passing through a home agent every time for a node not supporting this protocol, provided with a memory unit for storing a current address of a mobile node which the correspondent node should store instead of the correspondent node and a transfer unit for referring to the memory unit when receiving a packet transmitted to the home address of the mobile node, converting it to the current address, and transmitting the packet.

Mobile node adapted router and home agent router

In a node device which is part of a communication system with a terminal and a location registering server, a node device on a receiving side transfers, to a destination node device, a received inter-node packet, based on destination terminal location information stored in its storage portion or based on a location registering server, directly or through other devices, or the destination node device notifies a former node device (on the receiving side) of an address of its own device and the destination terminal directly or through other devices. Also, the node device on the receiving side or the destination node device notify a source node device of the address of the destination node device and the destination terminal directly or through other devices, based on a predetermined address stored in the storage portion of the terminal, the node device, or the location registering server.

Node device

The packet switch performs a scheduling process by selecting a unicast packet or a multicast packet to be output from each of N input buffers such that input lines and output lines cannot conflict each other for a unicast packet, and such that the input lines cannot conflict each other for the multicast packet.

Packet switch

A scheduling system is capable of causing no deterioration of characteristics even under equal and unequal loads, eliminating the necessity for high-speed repetitive scheduling and complicated arithmetic processes, simplifying its architecture and having its processing speed which does not depend upon a device capability. For attaining this system, an inter-highway pointer is updated to an adjacent line (rightward) when the scheduling for all the lines are finished. If the inter-highway pointer is updated N-times in the same direction (clockwise), the same pointer is updated to an adjacent line in a reverse direction (counterclockwise) in next N-processes of scheduling.

Scheduling control system and switch

To achieve QoS control, drop control and multicast control of a variable-length packet at high speed in small scale hardware, a packet divider divides a variable-length packet into fixed-length packets, and an input buffer section stores the divided fixed-length packets into queues by output lines and by QoS classes. A large number of QoS classes are mapped into only two kinds of classes including a guaranteed bandwidth class for which an assigned bandwidth is guaranteed and a best effort class for which a surplus bandwidth is allocated, thereby to achieve scheduling at the input side by an inter-line scheduler. An output buffer section assembles a variable-length packet from fixed-length packets that have been obtained by switching at a switch section in an output buffer section. A QoS control is performed based on a packet length.

Packet switch that converts variable length packets to fixed length packets and uses fewer QOS categories in the input queues that in the outout queues

A packet switch includes an input buffer memory unit having a logic queue corresponding to an output line, a control module for a first pointer indicating a scheduling start input line, a control module for a second pointer indicating a scheduling start output line of scheduling target outlines, a request management control module for retaining transmission request data about a desired output line, a scheduling processing module for starting a retrieval from within plural pieces of transmission request data from the output line indicated by the second pointer, and selecting an output line that is not ensured by other input lines, a packet buffer memory unit for temporarily storing a plurality of fixed-length packets and sequentially outputting the fixed-length packets, a switch unit for switching the fixed-length packets outputted from the packet buffer memory unit, and an address management unit for segmenting an address of the packet buffer memory unit into fixed-length blocks for a plurality of packets, and managing the address on a block basis. With this construction, the memory address is managed on the block basis, and a memory capacity can be reduced by giving an intra-block individual address per queue when in writing or reading.

Packet Switch

Data from an STM (Synchronous Transfer Mode) network is converted into an ATM (Asynchronous Transfer Mode) cell by an interworking facility, and the ATM cell is input to the ATM network. If the input cell corresponds to a connection which requires voice processing, a voice processing trunk within a switch performs the processes such as an echo compensation process, an encoding process, a multiplexing process, etc. The switch outputs the cell to a trunk line of the ATM network.

Switch and switching method for processing communication data of a particular connection

The present invention concerns a mobile packet communication system that supports data communications, including Internet communications, in a high-speed mobile communication system such as a cellular communication network, and integrates a mobile network and a fixed network on a common platform while providing the capability to select an optimum route. Location registration servers - - to - - each store in a one-to-one fashion the addresses of subscriber nodes - - to - - currently serving mobile terminals - - to - - each assigned a packet address, or store in a one-to-one fashion the addresses of gate nodes - - to - - connected to fixed equipment - - to - - each assigned a packet address, and a transmitting node, which is a subscriber node or a gate node, temporarily stores a receiving node address reported from the corresponding one of the location registration servers - - to - - , and transfers subsequent packets directly to the receiving node by using the temporarily stored receiving node address.

Growing community of inventors

Kawasaki, Japan

Tsuguo Kato