Fujitsu Corporation

Syuji Takada

Yasuhiro Ooba

Yukihiro Kikuchi

A transmission rate monitoring apparatus capable of promptly detecting the average transmission rate of data transmitted on a transmission channel. Data is received on the transmission channel, and a desired average transmission rate is set with respect to a predetermined time period. The amount of data received is measured and data is accepted or discarded in accordance with the data amount measured within the predetermined time period and the average transmission rate.

Transmission rate monitoring apparatus and method

A common buffer memory control apparatus controls a common buffer memory which is used to store message data items each of which is divided into a plurality of cells based on an asynchronous transfer mode. The common buffer memory control apparatus includes a free block management table for managing whether each of blocks into which the common buffer memory divided is free or used, a block selecting unit for selecting a block of the common buffer memory which is free with reference to the free block management table, and a cell writing control unit for controlling a write operation for cells of a single message data item so that the respective cells of the single message data item are written in the block, selected by the block selecting means, of the common buffer memory.

Common buffer memory control apparatus

The present invention relates to a packet transfer communication device. More particularly, the present invention relates to a congestion control unit designed to handle communication at high speed by reducing a load of congestion processing conducted in a core router and an edge router. The congestion control unit includes a packet discarding judgment section that conducts congestion control by a packet discarding judgment based on a smooth queue length which is a quantity of accumulated data composed of a difference between a quantity of input data and a quantity of output data at each predetermined period in a smooth queue length calculating section.

Congestion control unit

The invention relates to a flow controlling apparatus provided in a node of a packet routing network, the flow controlling apparatus performing a rate-based congestion control on packets supplied via an incoming line as well as buffer management. The invention also relates to a node apparatus that incorporates such a flow controlling apparatus. In the flow controlling apparatus and the node apparatus, a frequency at which individual packets belonging to the flows are to be discarded during the course of buffer management are kept, for each flow, at approximately the same value. Therefore, in a network to which the invention is applied, the transmission quality is kept uniform and the service quality is highly maintained while flexible adaptation is made to various service forms.

Flow controlling apparatus and node apparatus

In data insertion control technique; a plurality of buffers hold different types of data, which are to be inserted into a predetermined transmission medium and are equal in insertion priority, and a data insertion controller controls the data insertion order in which the data are to be inserted into the transmission medium by controlling the read process order in which the different types of data are to read from the buffers, based on the write process order in which the different types of data have been stored in the buffers. The result is that it is possible to realize exact data insertion in a minimum delay time.

Buffer apparatus with data insertion control function, insertion data controlling method, and data insertion apparatus with data insertion control function

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Kawasaki, Japan

Syuji Takada