摘要： 包延迟的分布特征是Internet端到端行为特征的一个重要组成部分，前人已在该方面进行了大量研究，但许多研究结论只适用于丢包率较小的情况。通过研究我国科技网和教育网上34条端到端路径上的延迟特征，得出了如下结论：（1）包延迟的分布特征与丢包率存在一定的关系；（2）在丢包率较小的情况下，包延迟的分布多具有单峰性；但随着丢包率的增大，包延迟的分布不再具有单峰性，而是呈现出越来越分散的特点；（3）随着丢包率的增大，固有延迟的发生次数呈现逐渐减少的趋势，当丢包率增大到一定程度，固有延迟的发生次数就很少了。

关键词: 包延迟, 包丢失, 单峰性

Abstract: The distribution characteristic of round-trip time is an important part of Internet end-to-end behavior characteristics. Authors study the RTT characteristics on 34 end-to-end paths in CSTNET and CERNET in China, and draw the following conclusions: (1) the distribution characteristics of RTT and loss rate are dependable ; (2) when loss rate is small, the distribution of RTT is usually unimodal; but with the increasement of loss rate, the distribution of RTT is no longer unimodal and becomes more and more decentralized; (3) with the increase ment of loss rate, the occurring times of inherent RTT tend to decrease.

中图分类号: 

• TP393.03