高带宽组播网络端到端时延测量及分析

Measurement and analysis of end-to-end latency in high bandwidth multicast network

随着IP组播技术的飞速发展,用户对多媒体视频流的需求的增加导致IP组播网络的性能下降。为解决IP组播性能测量中网络延迟问题,在高速校园网中,根据RFC标准文档中定义的组播性能测试指标和测试方法,实现精确测量组播网络的端到端时延,并且利用时钟同步原理对测量结果进行时钟频差分析。其创新之处在于将线性规划算法应用到对测量模型进行分析的过程中。通过在高速校园网中的测量结果表明,通过所提出算法对测量结果进行修正后可以得到准确的端到端网络时延。该研究为在校园网中推广组播流媒体应用打下基础,更有利于发现网络瓶颈,为未来网络构建奠定基础。

With the rapid development of IP multlcast technology, the increased user demand for multimedia video stream leads to the performance degradation of the IP multicast network. To solve the IP multicast network latency issues in performance measurement, in the high-speed campus network, the accurate measurement of end-to-end latency in multicast network is achieved according to the multi- cast performance testing and measurement methods defined in the RFC standard document. And the principle of clock synchronization is used to do clock frequency difference analysis on the measurement results. The contribution of the paper is that the linear programming algorithm is applied into the meas- urement model＇s analytic procedure. Through measurement experiments in the high-speed campus net- work, the results indicate that the measurement results amended by the algorithm can have an accurate end-to-end network latency. The study lays the groundwork for popularizing the multicast streaming media applications in the campus network, and is more conducive to find network bottlenecks that lay the foundation for the build of future networks.