一种基于分段测量的Internet端到端性能参数估计方法

Segmental Measurement Based Approach to Estimate Internet End-to-end Performance Parameter

传统的基于测量的Internet性能参数估计要求测量点是端到端路径的起点和终点,这一方面使得测量和估计带有很大盲目性,增加了网络流量;另一方面会导致测量方法难于实施,估计结果不准确。提出了基于分段测量的思想,对ITU-T定义的延迟、延迟变化、丢包率和错误率4个参数进行测量和估计。由于测量是分段进行的,每次测量值都可应用于多条端到端路径的性能参数估计,因此降低了盲目性并大大减少了网络流量。为验证本方法的性能,基于PlanetLab平台设计和实现了生成器、性能参数测量机和结果收集器。通过在全球的100多个节点上的部署和为期一个月的运行证明了该方法便于实施,并且具有较高的准确性。

The traditional measurement based method for estimating Internet performance parameters requires measurement points to be the start and the end of an end-to-end path. Such condition can make measurement aimless and increase network traffic. Meanwhile the estimation may be hard to implement,and the results may also be less accurate. This paper proposed a novel approach based on segmental measurement to estimate delay, delay variation,loss rate and error rate,which were defined by ITU-T. As each measurement can be used to several end-to-end path performance parameter estimations, the aimless of measurement was avoided and the network traffic was cut down significantly. Three module, including packet and path generator, parameter measurement machine and result collector, were designed and implemented based on PlanetLab. Its feasibility was illustrated by deploying on more than 100 world wide nodes. And the running data collected by result collector proved its accuracy.