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针对当前基于全节点测量模式的覆盖网延时测量方法开销较大的问题,提出一种改进的覆盖网延时测量方法.该方法通过评价所有覆盖节点的性能权值,并考虑测量冲突因素,挑选出一部分节点作为测量节点执行延时探测任务;同时采用逐层层析的方法获取底层网络链路级的延时信息,并通过节点间的通信,推算出测量节点无法直接测量的路径的延时估算值,减少了完成测量所需的探测次数,从而降低了总体测量开销.仿真实验结果表明,改进的测量方法能够在避免测量冲突的前提下,获得较为准确的覆盖网路径延时信息,但相比于传统的测量方法,具有更小的测量开销.
In view of the large overhead of current overlay delay measurement method based on full node measurement mode, this paper proposes an improved overlay delay measurement method. By evaluating the performance weights of all overlay nodes and considering the measurement conflict factors, Select some nodes as the measurement node to perform the delay detection task; at the same time, using the method of layer-by-layer analysis to obtain the delay information of the bottom network link level, and through the communication between nodes, the delay of the path that the measurement node can not directly measure is deduced , Which reduces the number of probes needed to complete the measurement and thus reduces the overall measurement overhead.The simulation results show that the improved measurement method can obtain more accurate information about the delay of overlay network path without the measurement conflict, But compared to the traditional measurement methods, with a smaller measurement overhead.