Canon Kabushiki Kaisha

Nippon Telegraph and Telephone Corporation

Ntt Docomo, Inc.

Mitsubishi Denki Kabushiki Kaisha

Jfe Steel Corporation

Japan Marine United Corporation

Takahiro Kubo

Daisuke Hisano

Yu Nakayama

Takashi Hasegawa

Satoshi Tamura

Takahiro Asai

Hatsuo Tajima

Yoichi Fukada

Hisashi Fukushima

Takeshi Menjo

Hiroyuki Uzawa

Yasuo Nami

Yoshihiro Murasawa

Shinichi Yoshihara

Yukihiko Okumura

Kazuo Suzuki

Masahiro Inoue

Takashi Kawai

Ryuichiro Maeyama

Youichi Fukada

Kazuhisa Furusawa

Hiroshi Tajika

Toshimitsu Danzuka

Nobuatsu Sasanuma

Tatsuo Takeuchi

Satoshi Suyama

Jiyun Shen

Haruhiko Moriguchi

Tetsuya Atsumi

Mitsuru Honda

Fumimaru Kawabata

Yoichi Kimura

Masashi Suda

Koichi Yamada

Ikuo Kuribayashi

Kohei Nomoto

Kazuo Hirasawa

Yoshiyuki Nakajima

Hiroshi Shiomi

Ryuji Muraoka

Go Yazawa

Tsunehisa Handa

Hisakazu Ohkubo

Yoshio Kosuge

Yutaka Watanabe

Ayako Iwaki

Natsuki Yasuhara

Noboru Kiji

Masanobu Toyoda

Yasumasa Nakanishi

An information processing device in a communication apparatus performs a management process of traffic flow management information for transfer of data including a plurality of frames from a transmission source terminal to a transmission destination terminal. Where new traffic flow management information of a traffic flow associated with a data frame identified by an identification unit on the basis of identification information included in the received data frame is recorded in the communication apparatus, a recording unit determines whether the number of pieces of traffic flow management information already recorded is equal to or more than a threshold value, and calculates and records a scheduled release time of the traffic flow management information according to a determination result.

Information processing apparatus, communication apparatus, information processing method and program

An object of the present invention is to provide a communication system and a communication method that can suppress an increase in the total fiber distance even if the number of secondary devices increases and that can make complex processing for band allocation for uplink optical signals unnecessary. The configuration of the communication system according to the present invention is a mixture of a ring type and a branch type, in which an optical fiber cable (primary path) from a communication station to each user's home is arranged in a ring (loop) shape, and the primary path is branched and laid to the user's home. Furthermore, unidirectional communication is enabled by a ring-type primary path, and the transmittable amount can be made uniform by further combining time division multiplexing.

Communication system and communication method

A communication apparatus according to an aspect of the present invention is a communication apparatus that is able to be connected to a different communication apparatus via a network including three or more paths, the communication apparatus including a processing circuitry configured to measure a network state for each of the three or more paths, calculate an evaluation value based on a result of measuring the network state for each of the three or more paths, select at least two paths to be used for communication from among the three or more paths based on the calculated evaluation value, generate a packet for transmission through duplication of an input packet, and transmit the generated packet to the different communication apparatus through the selected paths.

Communication apparatus and communication method

In a communication control system having a plurality of layer 2 switches and a network controller, the network controller includes a determination unit and an instruction unit, the determination unit being configured to determine whether or not a transfer communication flow feature indicating a feature of a communication flow transferred by a layer 2 switch of the plurality of layer 2 switches is similar to an abnormal communication flow feature indicating a feature of a communication flow when an abnormality occurs; and the instruction unit being configured to: output to the layer 2 switch, when the determination unit determines that the transfer communication flow feature is similar to the abnormal communication flow feature, a first instruction to lower priority of transfer processing for the communication flow and a second instruction to duplicate the communication flow to the layer 2 switch; or output the first instruction to the layer 2 switch, and output, to a server detecting a malicious attack, identification information identifying the communication flow having the transfer communication flow feature.

Communication control system, network controller and computer program

A transfer device for coupling a priority signal and a standard signal and transferring the signal includes a reception unit that receives a plurality of signals transmitted from a device connected to an opposite side of a transfer route, a separation unit that separates the signal into the priority signal and the standard signal, a signal defragmentation unit that defragments the plurality of standard signals, a multiplexing unit that multiplexes each of the priority signal and the standard signal, a priority control unit that determines a transfer order of the signals, a header information copy unit that copy header information of the standard signal, a transmission unit that transmits the signal to a device connected to the transfer route, an interrupt transfer processing unit that perform an interruption process when the priority signal arrives during the transfer of the standard signal, a signal fragmentation unit that fragments the standard signal, a header information assignment unit that assigns the header information to the standard signal, and a transmission delaying unit that delays the transfer of the standard signal until the priority signal has been transferred.

Transfer device and transfer method

A communication control apparatus includes an observed data rate acquiring unit configured to acquire observed data rates indicating input data rates of queues, the observed data rates being observed in a layer 2 switch, a threshold value storage unit configured to store predetermined threshold values of the queues, a shaping rate determination unit configured to determine a shaping rate of each queue based on both observed data based on an observed data rate of the observed data rates acquired by the observed data rate acquiring unit and a threshold value of the predetermined threshold values stored in the threshold value storage unit, and a shaping rate setting unit configured to set, in the layer 2 switch, the shaping rate of each queue determined by the shaping rate determination unit.

Communication control apparatus and communication control method

A communication control system is a communication control system including: a plurality of layer 2 switches; and a control apparatus. Each of the plurality of layer 2 switches includes a queue having a queue length being adjustable for each of transfer routes of data, and a transmission unit configured to transmit the data stored in the queue for each of the transfer routes to a subsequent destination of the data at a data rate being adjustable for each of the transfer routes. The control apparatus includes an adjustment processing unit configured to acquire information representing a discarded data amount being a data amount of the data discarded in the queue from one of the plurality of layer 2 switches having discarded the data, and adjust the queue length and the data rate of each of the plurality of layer 2 switches for each of the transfer routes, based on the discarded data amount.

Communication control system and communication control method

A data collection unit of an NW controller () collects, from an L2SW () constituting an L2NW (), uplink observation data indicating traffic volume of a session request packet addressed to an application serverand downlink observation data indicating traffic volume of a session response packet transmitted from the application server, which are acquired by observing packets input to the L2SW (). A control unit changes shaping rate of the packets addressed to the application server () through the L2SW () included in the L2NW () based on a ratio between the traffic volume indicated by the uplink observation data and the traffic volume indicated by the downlink observation data, or a ratio between an increment of the traffic volume acquired from the uplink observation data and an increment of the traffic volume acquired from the downlink observation data.

Network control apparatus and network control method

A transfer device for coupling a priority signal and a standard signal includes a reception unit configured to receive a plurality of signals transmitted from a device connected to a path different from a forwarding path, a separation unit configured to separate the signals into the priority signal and the standard signal, an identifier reference unit configured to reference an identifier added to the standard signal, an identifier sort unit configured to sort the standard signal by the identifier, a signal coupling unit configured to couple the plurality of standard signals, a multiplexing unit configured to multiplex the priority signal and the standard signal, a priority control unit configured to determine a transfer order of the signals, a transmission unit configured to transmit the signals to a device connected to the forwarding path, an interrupt transfer processing unit configured to perform interrupt processing in a case where the priority signal arrives during transfer of the standard signal, a signal division unit configured to divide the standard signal, an identifier addition unit configured to add the identifier to the standard signal divided, and a transmission suspending unit configured to suspend transfer of the standard signal until transfer of the priority signal is completed.

There is provided a radio communication system provided with a first base station, a second base station that communicates with the first base station, and user equipment that communicates with the first base station, the radio communication system including a determiner that determines, based on a predetermined reference value, sharing between signal processing that is to be performed by the first base station and signal processing that is to be performed by the second base station; a first signal processor for the first base station to perform the signal processing in accordance with the sharing determined by the determiner; and a second signal processor for the second base station to perform the signal processing in accordance with the sharing determined by the determiner.

Radio communication system and base station

A radio communication system includes a first base station, a second base station, a third base station, and a user equipment, wherein the radio communication system includes a determination unit that determines allocation of signal processing that is commonly performed by the first base station and the second base station and signal processing that is performed by the third base station, based on a predetermined reference value; a first signal processor that performs the signal processing allocated to the first base station in accordance with the allocation determined by the determination unit; a second signal processor that performs the signal processing allocated to the second base station in accordance with the allocation determined by the determination unit; and a third signal processor that performs the signal processing allocated to the third base station in accordance with the allocation determined by the determination unit.

To reduce a bandwidth required for an optical transmission path () in a base station system including an RAU () for performing MIMO transmission using a plurality of antenna elements and a BBU (), in a communication control method of the present invention, the BBU () transmits antenna weight coefficient information indicative of antenna weight coefficients of a plurality of antenna elements () and a transmission signal, and the RAU () multiplies the transmission signal from the BBU () by each of the antenna weight coefficients to generate weighted signals of the plurality of antenna elements (), and transmits the weighted signals from the plurality of antenna elements ().

Radio apparatus, radio control apparatus and communication control method

A master station apparatus modulates downlink digital control data that includes at least a synchronization signal and a control signal, adds resource element information to the modulated control data, and composites downlink digital frequency-domain user data that has not been modulated and data originating from the modulated control data to which the resource element information has been added. A slave station apparatus converts a received optical signal into an electrical signal, separates, from the electrical signal, the frequency-domain user data and the data originating from the modulated control data, modulates the frequency-domain user data, adds resource element information to the modulated user data, and transmits time-domain composite data including a component originating from the modulated user data and a component originating from the modulated control data by radio waves.

Radio base station, master station apparatus, slave station apparatus, and control method

There is provided by the present invention a database of cases in which index-labeled case data is accumulated, an index appearance matrix generator for generating an index appearance matrix as a target according to a first index from the case data an index appearance matrix generator for generating a index appearance matrix as a reference according to a second index from the case data, a cross index matrix generator for generating a cross index matrix from these index appearance matrixes, an inter-index attribute value fuzzy relation computing section for computing a fuzzy relation between index attribute values from the cross index matrix, and a fuzzy thesaurus generating section for generating a fuzzy thesaurus from a fuzzy relation between the index attribute values.

Fuzzy thesaurus generator

An image forming apparatus includes a recording material supporting member for supporting and transporting a recording material, an image forming device for forming an image on the recording material supported by the recording material supporting member, and a polishing device, having polishing particles provided on the surface thereof and a holding portion for holding the polishing particles, for polishing the recording material supporting member.

Image forming apparatus and oil cleaning member

Growing community of inventors

Tokyo, Japan

Takahiro Kubo