Nec Corporation

Yoshitaka Nakao

Hiroaki Nakajima

Satoshi Sonobe

Hideyuki Muto

Hiroshi Nakaishi

Kentarou Kudou

Shunichi Kumagai

Yasuhisa Kanda

Kazuhito Ikai

[Problem] The problem is to carry out the QoS control which tracks a change in a state of an outward line. [Means for solving the problem] A network repeater according to the present invention includes: a flow control means to carry out flow control for restricting inflow of a data flow which is received through an inward line; a bandwidth control means to carry out bandwidth control of controlling a bandwidth of a data flow which is received through the inward line and is sent through an outward line; and an outward line monitoring means to monitor a change in a state of the outward line. In the case that the monitored state of the outward line satisfies a specified condition which is determined in advance, either the flow control or the bandwidth control is carried out on a condition corresponding to the specified condition.

Network repeater, QoS control method and storage medium storing QoS control program

A wireless network relay apparatus includes a Layerswitch and a line control device as well as wireless/wired line terminating devices performing band limitation associated with an AMR function. It measures traffic passing through each line terminating device in inflow/outflow path directions. Upon detecting a modulation scheme changed due to an AMR function in a wireless area, it may specify a line terminating device so as to read a desired modulation scheme from a transmission source modulation scheme conversion table of the line control device based on traffic. It may change a local modulation scheme with a desired modulation scheme when a difference therebetween is above a predetermined number of stages. By tracking a modulation scheme changed for a transmission destination, it is possible to appropriately change a modulation scheme for a transmission source, thus suppressing traffic without discarding necessary data.

Wireless network relay apparatus

[Solution to Problem] A load balance control unit, which is included in a transmission apparatus for transmitting a plurality of units of data, each being a piece of transmission data delimited by a given data length, to an opposite apparatus via a plurality of transmission lines, includes sorting buffers which are provided for the respective transmission lines; a threshold setting element which sets upper limit retention threshold values for the respective sorting buffers; and a sorting determination element which determines, for each of the units of data, in which of the sorting buffers the each of the units of data is to be written, taking into consideration retention states and the upper limit retention threshold values of the respective sorting buffers, and a data amount of the each of the units of data.

Load balance control unit, load balance control method and storage medium

An optical communication system includes a first optical communication apparatus configured to insert a wavelength control signal in a main signal to produce a modified main signal; convert the modified main signal into a first optical signal; and transmit the first optical signal, and a second optical communication apparatus configured to receive the first optical signal; extract the wavelength control signal from the received first optical signal; determine a wavelength of a second optical signal based on the extracted wavelength control signal; and transmit the second optical signal to the first optical communication apparatus.

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Tokyo, Japan

Yoshitaka Nakao