Communication system, usable bandwidth estimation device, usable bandwidth estimation method, and recording medium storing usable bandwidth estimation program

摘要

Provided is a communication system for accurately estimating an available bandwidth in a short time and with a low load. The communication system includes a transmission side device 500 that transmits a packet train and a reception side device 600. The reception side device 600 includes a packet train reception unit 601, information indicating a lower limit extended ideal curve including a queuing delay, An ideal curve storage unit 602 that stores information indicating an ideal curve within a range including a queuing delay and a serialization delay, and information indicating an upper limit extended ideal curve including a serialization delay, a lower limit extended ideal curve, an in-range ideal curve, and an upper limit An ideal curve selection unit 604 that selects an ideal curve that is most similar to the increasing tendency of delay indicated by the increase amount of delay based on the observation data calculated by the delay increase amount calculation unit 603 from the extended ideal curve, and a selection result And an available bandwidth estimation unit 605 for estimating the available bandwidth.