High-efficiency single-end available bandwidth measuring method

The invention relates to a high-efficiency single-end available bandwidth measuring method (pathpider) which comprises the following steps: a transmitting end transmits a specific probe packet train to a destination node; the transmitting end calculates a series of round trip time delay (RTT) values in accordance with a series of ICMP (Internet Control Message Protocol) packets returned by the destination node, and determines the time when the round trip time delay starts to remain constant; and the transmitting end calculates the average transmission rate of the packet train within the time period from the time when the packet train starts to be transmitted to the time when the round trip time delay starts to remain constant, and uses the average transmission rate as the measured value of the available bandwidth of the path. The invention can realize single-end available bandwidth measurement based on the novel probe packet train, and the available bandwidth value can be measured by only transmitting the probe packet train once. Thus, the invention has the advantages of high measurement accuracy, high convergence speed, low invasion degree and high robustness.