关键词: IP组播, 时延测量, 线性规划算法, 时钟频差

Abstract:

With the rapid development of IP multicast 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 multicast 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 measurement model's analytic procedure. Through measurement experiments in the highspeed campus network, 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.

Key words: IP multicast, latency measurement, linear programming algorithm, frequency difference