Fujitsu Corporation

Masafumi Katoh

Toshio Soumiya

Naotoshi Watanabe

Takeshi Kawasaki

Hitoshi Yamada

Satoshi Kakuma

Tomohiro Ishihara

Masato Okuda

Shunji Abe

Akihiro Inomata

Takashi Hatano

Koji Nakamichi

Tsuguo Kato

Tatsuya Kikuzuki

Michio Kusayanagi

Yoshihiro Watanabe

Makoto Yoshida

Toshiyuki Sudo

Ryuichi Takechi

Teruhisa Ninomiya

Tetsuya Nishi

Kenichi Fukuda

Naoki Matsuoka

Hiroshi Tomonaga

Masaaki Takase

Kaoru Yokoo

Ichiro Iida

Masaaki Kawai

Akira Chugo

Ichirou Ida

Kazumi Kasai

Yoichiro Igarashi

Kazuo Sakagawa

Hidenao Nakajima

Yoshimi Watanabe

Tetsuya Yokota

Mitsuyasu Ogawa

A wireless communication system includes a transmission device, a relay device, and a reception device and is configured to execute direct communication of directly transmitting a wireless signal from the transmission device to the reception device without routing through the relay device and indirect communication of indirectly transmitting a wireless signal from the transmission device to the reception device through the relay device. The wireless communication system includes a controller configured to estimate a disconnection continuation time that is a time during which the direct communication is not executable in a case where the direct communication is not executable while the direct communication is repeatedly executed, continue to execute the direct communication when the disconnection continuation time is shorter than a threshold time, and execute the indirect communication when the disconnection continuation time is longer than the threshold time.

Wireless communication system, wireless communication method, transmission device, control method, and recording medium

A wireless communication device, including a radio transceiver data configured to transmit and to receive data packets to and from a base station, and a processor configured to compute a proportional hidden standby time being computed on the basis of at least two of from among a proportional exposed communication time, a proportional exposed collision time, and a proportional exposed standby time, to compute a predicted PER from the proportional hidden standby time computed; to compute a threshold value for the number of retransmission attempts on the basis of the predicted PER computed, and to cause the radio transceiver to repeat transmission of a data packet to the base station until the number of transmissions exceeds the threshold value computed in the case of failed transmission of a data packet to the base station by the radio transceiver.

Wireless communication device and wireless communication device control method

A gateway device according to the present art includes a storage part that stores a list having identification information identifying another gateway device that is selectable as a move-destination gateway device; a receiving part that receives a call-out signal from a device located in a telephone network; a move-destination-gateway-device selecting part that selects a move-destination gateway device from the list; a re-direction notification generating part that generates a re-direction notification to be transmitted to the selected move-destination gateway device; a re-direction notification transmitting part that transmits the re-direction notification to the move-destination gateway device; a re-direction request signal generating part that generates a re-direction request signal including call identification information identifying the call-out signal; and a re-direction request signal transmitting part that transmits the re-direction request signal to the device located in the telephone network that transmits the call-out signal.

Gateway device

This invention is to appropriately cope with abnormal states. A control method according to the present invention includes: identifying an abnormal level according to abnormal level reference data stored in advance in an abnormal level reference data storage, from context relating to abnormalities, which has been collected in advance and stored in a context storage; and converting the identified abnormal level to an authentication strength level according to a predetermined authentication strength level setting rule, and causing an authentication server to carry out an authentication processing according to the authentication strength level. By carrying out such a processing, it becomes possible to cause the authentication server to carry out an authentication having an authentication strength level corresponding to an abnormal state.

Control method, control program, and control system

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

This invention is to enable to provide a network service, flexibly and quickly. In an embodiment of the invention, a network platform is achieved by a service providing network. The network platform provides common functions such as authentication and authorization, billing, and client management, and individual functions such as session control for client terminals connected with the service providing network. The client terminal generates and registers a service program to utilize functions in the network platform via a network management interface SMI. Then, by executing the service program, a service request for a specific function is transmitted to the network platform through a service control interface SCI, and the execution result is received from the specific function in the network platform.

Network service processing method and system

In a first UPC, a PCR is set as a monitor rate for each connection. If a transfer rate of a cell exceeds the PCR set for the connection, the cell is discarded. In a second UPC, an ACR is set as a monitor rate for each connection. If the transfer rate of the cell exceeds the ACR set for the connection, a lower priority is assigned to that cell. Additionally, with a configuration where one UPC monitors a varying rate, a parameter change process is controlled by obtaining a time between a passage time of a detected B-RM cell and an arrival of a user cell and comparing the obtained time with maximum and minimum delay standard values. A parameter table including some parameters is provided. A header of an arrived cell in a forward direction is extracted, and it is determined whether or not the arrived cell is a violation cell using the leaky bucket algorithm, etc. If the arrived cell is a violation cell, it is discarded. An RM cell in a backward direction is received and extracted, and the parameter table is updated by calculating the minimum cell interval, etc. based on data included in a payload of the RM cell.

Packet flow monitor and control system

An ATM connection is a virtual communication path specified by VPI/VCI. A plurality of ATM connections that are directed to the same output line is defined as an ATM connection group. A connection UPC (Usage Parameter Control) facility is provided for each of the ATM connections and a connection group UPC facility is provided for the ATM connection group. The connection UPC facilities and the connection group UPC facility are operated in either the monitor mode or the control mode. In the monitor mode, when the rate of flow of packets into a network exceeds a threshold, a control unit is informed of it, but cells are allowed to enter the network as they are. In the control mode, when the rate of flow of cells into the network exceeds the threshold, cells the flow rate of which exceeds the threshold are discarded.

For both a bandwidth-guaranteed connection call and a non-bandwidth-guaranteed connection call together, with respect to the bandwidth-guaranteed connection call, a schedular allocates the number of time slots which correspond to a required bandwidth to the bandwidth-guaranteed connection call from among the N time slots that constitute one period and so controls as to transmit an ATM cell at an allocated time slot. The non-bandwidth-guaranteed call transmitting unit transmits an ATM cell of a non-bandwidth-guaranteed connection call at a time slot which is not allocated to any bandwidth-guaranteed connection call. A congestion/normal state monitoring unit sets in advance a queue length which is regarded as the occurrence of a long-term congestion in a queuing buffer and compares the actual queue length with the preset queue length so as to detect the occurrence of a long-term congestion.

ATM exchange for monitoring congestion and allocating and transmitting

A plurality of switching modules arrayed in a plurality of columns and in at least one row switch over paths in accordance with path data contained in cells to transfer inputted data to a target line on the cell-unit. One or more path switching units are provided between two adjacent columns of switching modules among plural columns of switching modules and switch paths between the respective switching modules, disposed in a side-by-side relationship in a row direction, of one column of switching modules of the two adjacent columns of switching modules and the respective switching modules, disposed in the side-by-side relationship in the row direction, of the other column of the two adjacent columns of switching modules.

ATM switch and method for switching path by ATM switch

A cell buffer is provided for storage of cells for each quality class. A counter is provided for each cell buffer. A threshold value which regulates the respective readout interval is set for each quality class. The count of the counter for each quality class is increased by 1 for each time slot. When the count for a certain quality class reaches the threshold value, if a cell is stored in the cell buffer for that quality class, that cell is read out and output, and, at the same time, the count is decreased by the threshold value. When the count for a certain quality class reaches the threshold value, if a cell is not stored in the cell buffer for that quality class, the count is left unchanged.

Communication service quality control system

In an ATM switching system responsive to a call setup request from each of B-ISDN terminals, a band for an accepted call is estimated in accordance with fuzzy decision on the basis of the fact that the network traffic characteristics can be determined empirically. Therefore, it is possible to estimate the band without any complicated band estimation calculations, improve the call acceptance processing response speed, and further improve the availability efficiency of the network transmission line. In the consequents of the fuzzy rules in particular, the respective band estimation values are represented by the respective input functions, or particularly by the linear couplings coupled by predetermined linear parameters of respective inputs, thus improving the descriptive capacity of the rules.

Connection admission control system

A connection admission control method for allocating many calls to a transmission line while guaranteeing the quality of service such as the cell loss ratio, where an average cell rate/peak cell rate comparator judges that a call requesting admission has a variable-speed traffic property when the average cell rate Ra and the peak cell rate Rp which are declared by the user are different. A traffic class judging portion determines the traffic class to which the call belongs on the basis of the peak cell rate. A required bandwidth calculator obtains the required bandwidth for guaranteeing the quality on the basis of the sum of the average cell rate of the call requesting admission and the average cell rates of all the calls that belong to the traffic class and that are already allocated to a transmission line, and outputs the calculated bandwidth as the estimated bandwidth. An estimated bandwidth calculator for calls having a variable-speed traffic property calculates the estimated total bandwidth for all the traffic classes, and a call admission judging portion judges whether or not there is a vacant bandwidth in the transmission line which is necessary for accepting the call requesting admission with consideration of the calculated estimated total bandwidth and the physical bandwidth, and accept the call if vacant bandwidth exists, otherwise reject the call.

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Kawasaki, Japan

Masafumi Katoh