Fujitsu Corporation

Keiichi Nakatsugawa

Junichi Suga

Ryuichi Takechi

Hideaki Ono

Akiko Yamada

Tsuguo Kato

Yuji Matsumoto

Hideaki Takusagawa

Shinya Kano

Toshio Soumiya

Shinji Yamashita

Fumiyuki Iizuka

Nobutsugu Fujino

Sho Shimizu

Itaru Nakagawa

Kazuhiro Muraoka

Yoshiyuki Seguchi

Kazuyuki Oka

Hitoshi Koike

Hidetoshi Abeta

Hiraku Koganemaru

Takeshi Kamura

Masahiko Fuse

Naotaka Tsuji

Zenichi Yashiro

Ryuuichi Takechi

A management method includes executing an acquisition process, estimation process, comparison process, and output process. The acquisition process acquires; an actual measurement value of the first traffic, and accesses a memory storing a model for estimation of second traffic in accordance with the first traffic. The estimation process includes obtaining, for each of the plurality of communication apparatuses, an estimation value of the second traffic by inputting the actual measurement value of the first traffic per unit time into the model. The comparison process includes comparing, for each of the communication apparatuses, an estimation value of the second traffic and a given value with each other. The output process includes outputting an alert in accordance with a result of the comparison process.

Management apparatus, management method and non-transitory computer-readable storage medium for storing management program

A resource management device provides a communication service in a network in response to a service request. The resource management device includes a processor. The processor executes a process. The process includes converting a total resource amount in the network into a first value. The process includes assigning a second value to each type of the communication service from the first value. The process includes second converting a resource requesting amount of the service request into a third value. The process includes setting, determining that the third value is equal to or less than the second value that is assigned to the type of the communication service of the service request, a communication service associated with the service request for a communication device on the network.

Resource management device, resource management system, and computer-readable recording medium

A wavelength allocation device includes a decision unit, a determination unit, and an evaluation unit. The decision unit decides whether a wavelength bandwidth of an optimum route for a demand has a free bandwidth to which the demand can be allocated. The determination unit allocates the demand to a bypass route, in the case that the wavelength bandwidth of the optimum route does not have the free bandwidth in the decision unit. The evaluation unit integrates the degree of influence of a section on the optimum route, which becomes a bypass factor, based on a difference in a route cost between the optimum route and the bypass route for the demand.

Method of allocating wavelength and wavelength allocation device

A switch apparatus includes a first controller, a second controller, and a plurality of switch devices, the plurality of switch devices being configured to receive a packet and store a flow table which indicates a method of handling a process of the received packet, wherein the first controller informs a first content of the flow table to the plurality of switch devices, a first switch device detects a communication error between the first switch device and the first controller, the first switch device informs a second switch device of the communication error, and the second switch device changes a connecting destination from the first controller to the second controller.

System, switch device and method of controlling a plurality of switch devices

An information processing device includes a memory configured to store information related to data accesses by executions of a plurality of applications, and a network configuration of a network system including a plurality of communication devices and a plurality of processing devices each of which executes any one of the plurality of applications, and a processor configured to calculate traffic amounts, when each of the plurality of communication devices is assumed as a data storage location to store data to be accessed by the executions, to be generated in the network system by the executions, based on the information and the network configuration, and determine a communication device to store the data to be accessed by the executions based on the calculated traffic amounts, among the plurality of communication devices.

Information processing device, information processing method, and recording medium

A system includes a terminal apparatus configured to generate pieces of data, each of the pieces of data including time information indicating when each of the pieces of data is generated; a destination apparatus configured to accumulate the pieces of data; a relay apparatus configured to store the pieces of data transmitted from the terminal apparatus based on the time information and to relay the pieces of data to the destination apparatus; and a processing apparatus configured to acquire the pieces of data that are stored in the relay apparatus and to process the pieces of data, wherein the relay apparatus is configured to store an amount of the pieces of data in the relay apparatus based on the time information, the amount corresponding to an amount of data that the processing apparatus processes based on a time range of the pieces of data.

System, method, computer-readable medium and apparatus

An OpenFlow switch used in an OpenFlow network including a plurality of OpenFlow switches and an OpenFlow controller configured to control the plurality of OpenFlow switches includes: a failure detector configured to detect a failure of a link connected to the OpenFlow controller; and a channel management unit configured to establish an OpenFlow channel to transmit control information to the OpenFlow controller through another OpenFlow switch among the plurality of OpenFlow switches when a failure is detected by the failure detector.

Openflow switch and failure recovery method in openflow network

A transmitting apparatus transmits a data stream via multiple wireless links and includes a storage unit that stores a guaranteed rate to be guaranteed for the data stream; a dividing unit that divides traffic of the data stream into first traffic corresponding to the guaranteed rate stored in the storage unit and second traffic corresponding to a portion of the traffic exceeding the guaranteed rate; and a distributing unit that distributes the first traffic to at least any one of the wireless links preferentially over the second traffic, and distributes the second traffic to available bandwidths of the plural wireless links.

Transmitting apparatus, transmission method, and transmission system

A relay apparatus in a communication system including a transmission apparatus, a reception apparatus, and a plurality of relay apparatuses which include the relay apparatus, including: a receiver receiving distributed sequential packets from the transmission apparatus which distributes sequential packets for the reception apparatus among the plurality of relay apparatuses, a memory storing distributed sequential packets of the sequential packets in sequential order, the distributed sequential packets are distributed and transmitted to the relay apparatus by the transmission apparatus, and a processor selecting a discard packet from the distributed sequential packets based on a discard condition, and to add a discard information to a previous packet and to transmit the previous packet, the discard information indicates a sequence number of the discard packet to be discarded, and the previous packet is one of the distributed sequential packets before the discard packet in sequential order.

Relay apparatus, reception apparatus, and communication system

A base station apparatus that wirelessly communicates with a wireless terminal, including: a determination portion that determines a mode of the wireless terminal that exists in a service area of the base station apparatus; and a setting portion that sets a first mode in which a first period in which the base station apparatus is communicable with the wireless terminal and a second period in which the base station apparatus is incommunicable with the wireless terminal are provided alternately, based on a result of the determination of the determination portion, and sets a length of the second period based on the result of the determination of the determination portion.

Base station apparatus, wireless terminal, communication system and method for controlling communication system

A transmitting apparatus selects any one of areas included in a transmission area of a first signal used for a first process, and transmits the first signal by using the selected area. The area is selected according to a type of information to be transmitted among a plurality of types of information capable of being transmitted to a receiving apparatus. The receiving apparatus receives the first signal transmitted by the transmitting apparatus, and performs a second process by using information according to the area in which the first signal is received.

Transmitting apparatus and receiving apparatus

A wireless base station for performing wireless communication with a wireless terminal using a frequency bandwidth different from another adjacent wireless base station in a first time period and performing wireless communication with a wireless terminal using a frequency bandwidth shared with another adjacent wireless base station in a second time period and including a control unit that does not change a burst profile to be applied to an uplink transmission or assigns a burst profile corresponding to a wireless transmission rate equal to or less than a wireless transmission rate corresponding to an applied burst profile with respect to a wireless terminal used for wireless communication in the first time period.

Scheduling method, wireless base station, and wireless terminal

A reception unit receives data from communication apparatuses. A transmission unit transmits data to the communication apparatuses. A control unit determines, in an adaptive way, which modulation and coding schemes to use to transmit and receive data. At a first stage, a modulation and coding scheme with a low transmission rate or a modulation and coding scheme that minimizes power requirements is selected from among a plurality of candidates therefor. At a second stage, the modulation and coding scheme of at least one of the communication apparatuses is changed to another scheme having a higher transmission rate, when it is impossible to allocate sufficient resources for the modulation and coding schemes selected at the first stage.

Receiving apparatus, transmitting apparatus, reception method, and transmission method

In a communication system a base station maps paging information the destinations of which are a plurality of mobile stations to a specific frame of frames and transmits the specific frame to a relay station. The relay station for relaying communication between the base station and the plurality of mobile stations receives the specific frame, maps the paging information the destination of which are the plurality of mobile stations and which is mapped to the specific frame, to the remaining frames of the frames on the basis of a determined rule, and transmits the remaining frames to the plurality of mobile stations. When the plurality of mobile stations are under the control of the relay station, the plurality of mobile stations receive the remaining frames and acquire the paging information on the basis of the determined rule.

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Kawasaki, Japan

Keiichi Nakatsugawa