4 结论
本文提出了利用多播依赖树模型和上向——下向算法推测链路时延的方法。和传统的方法比较，这种方法可以在数据不完整的情况下，推测各条链路上的条件概率，这也恰恰适合端到端测量的特点。仿真结果也显示了这种方法的正确性和有效性，估测数据和真实数据比较一致，能够反映链路延迟的基本状况。相信我们提出的这种方法可以运用到以后的网络测量中。
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