Nippon Telegraph and Telephone Corporation

Daisuke Hisano

Tatsuya Shimada

Hiroyuki Uzawa

Takahiro Kubo

Yu Nakayama

Hiroshi Ou

Yoichi Fukada

Hiroko Nomura

Jun Terada

Takayuki Kobayashi

Rintaro Harada

Youichi Fukada

Naotaka Shibata

Hirotaka Nakamura

Hirotaka Ujikawa

Shigeru Kuwano

A bandwidth allocation device is included in a communication system having a terminal station device and a terminal device and relaying upstream data, which is received from a communication terminal by a lower device connected to the terminal device, to an upper device connected to the terminal station device. The bandwidth allocation device includes a transmission-permitted period start position determining unit configured to estimate a start position of an arrival period in which the upstream data arrives at the terminal device from the lower device; a transmission-permitted period length determining unit configured to estimate a length of the arrival period based on an amount of upstream data to be transmitted from the lower device to the terminal device; and a bandwidth allocation unit configured to allocate a bandwidth to the terminal device based on the estimated start position and the estimated length of the arrival period.

Bandwidth allocation device and bandwidth allocation 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 transfer apparatus include a distribution unit, a storage unit, and a transfer unit, in which the distribution unit is configured to identify a plurality of networks to which frames belong, distribute the frames for each of the networks based on an identification result, and store the distributed frames in the storage unit, the storage unit is configured to store information of a time at which a frame of the frames is stored in the storage unit and the frame in association with each other, and the transfer unit is configured to detect a period of time for which the frame stays in the storage unit, detect a remaining period to send which is a remaining time of a time for which the frame is permitted to stay in the storage unit, for each of the frames, based on a difference between the time for which the frame stays in the storage unit and the delay upper limit value, and output the frame to a predetermined apparatus based on the remaining period to send.

Transfer apparatus, transfer method, and transfer program

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 bandwidth allocation apparatus includes: a traffic starting position detection unit that detects a start timing of burst traffic on the basis of the traffic information; a traffic information extraction unit that extracts information on a traffic amount of each of a plurality of traffic allocation periods from the traffic information extracted for each lower-level apparatus; a traffic amount estimation unit that calculates an average value of the traffic amount in the traffic allocation periods on the basis of the information on the traffic amount that the traffic information extraction unit has extracted for each lower-level apparatus; and a bandwidth allocation unit that allocates a first bandwidth which is an allocation bandwidth based on the average value calculated by the traffic amount estimation unit to the terminating apparatus from the start timing detected by the traffic starting position detection unit.

Bandwidth allocation apparatus and bandwidth allocation method

An optical transmission system includes ground stations; optical-terminating devices; a traffic-monitoring unit that detects a traffic amount of the uplink signal transmitted in a time-division multiplexing manner for each of the optical-terminating devices; and a bandwidth allocation calculation unit that estimates one optical-terminating device of the optical-terminating devices connected to one ground station of the ground stations having a cell where the moving object is positioned on the basis of the traffic amount, and calculates a first allocation amount of a bandwidth allocated to the uplink signal of the one optical-terminating device connected to the one ground station having the cell where the moving object is positioned and a second allocation amount of a bandwidth allocated to the uplink signal of another optical-terminating device of the optical-terminating devices connected to another ground station of the ground stations having a cell adjacent to the cell where the moving object is positioned.

Optical transmission system and bandwidth allocation 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.

A bandwidth allocation apparatus includes a request information acquisition unit configured to acquire request information indicating a required amount for a bandwidth allocation by using a communication link separated from a data link used in data communication, a determination unit configured to determine, on the basis of the request information, whether the bandwidth allocation that allows transmission of data within the designated time, to a termination apparatus is possible, and a bandwidth-allocation amount definition unit configured to, in a case where the bandwidth allocation to the termination apparatus is determined not to be possible, specify some termination apparatuses to which the bandwidth allocation that allows transmission of data within the designated time, is possible, define a bandwidth allocation amount for a specified termination apparatus, and allocate the defined bandwidth allocation amount to the specified termination apparatus.

An optical transmission device includes a bandwidth allocator that periodically reads bandwidth request information indicating a bandwidth required for a termination device to transmit an uplink signal from a storage and allocates a bandwidth to the termination device on the basis of the read bandwidth request information, and a timing adjuster that adjusts a period at intervals of which the bandwidth allocator reads the bandwidth request information from the storage on the basis of the timing at which resource information used to generate the bandwidth request information is received from an upper device.

Optical transmission device and bandwidth allocation method

An optical transmission system of an embodiment connects a plurality of wireless communication systems to each other, and includes a wavelength allocation unit that allocates different wavelengths to optical-terminating devices to which the wireless communication systems next to each other are connected, on the basis of the physical arrangement of each of the plurality of wireless communication system.

Optical transmission system and wavelength allocation method

A relay transmission system includes a relay unit configured to relay uplink signals and downlink signals in the first and second communication systems, a time division duplex (TDD) information estimation unit configured to estimate a transmission period of network devices in the first communication system on the basis of the uplink or downlink signal of the first communication system that is relayed by the relay unit, a surplus bandwidth determination unit configured to determine a surplus bandwidth in which an uplink signal of the first communication system is not allocated to a relay target of the relay unit during the transmission period on the basis of the number of network devices and a maximum transmission capacity of the network devices, and a bandwidth allocation unit configured to allocate the uplink signal of the second communication system to the relay target of the relay unit in the surplus bandwidth.

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Yokosuka, Japan

Daisuke Hisano