Patent ID: 7035216

Claim:
A congestion control unit comprising: an input data measurement section for measuring a quantity of packet data to be inputted; and a packet discarding judgment section for conducting a discarding judgment of an arriving packet and outputting a packet not to be discarded into an output queue and the input data measurement section, the input data measurement section including a measurement section for outputting a constant quantity of packet data, which are inputted from the packet discarding judgment section, at a predetermined period and also including a smooth queue length calculating section for accumulating data outputted from the measurement section and outputting a constant quantity of accumulated data in the predetermined period, wherein the packet discarding judgment section 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 the smooth queue length calculating section, and the smooth queue length calculating section includes a memory device or pointing device for calculating and displaying a quantity of accumulated data composed of a difference between the quantity of input data and the quantity of output data.