无线局域网聚集业务流非平稳性检验*

无线网络业务特性分析是网络性能评价、规划、设计、管理和控制的基础。分析了真实无线局域网业务流的基本统计特性，并应用单位根检验方法检验无线局域网中的聚集业务流的非平稳性。实验结果表明，不论是下行的还是上行的聚集流在不同显著水平上存在非平稳性；同时对这些聚集业务流的一阶差分序列进行检验，结果表明差分序列都是平稳的，这说明下行和上行的聚集业务流均是含有一个单位根的非平稳序列，这为无线网络业务流的进一步建模提供了指导。

Testing non-stationarity of aggregate WLAN traffic

The study of WLAN traffic characteristics is not only important for network performance evaluation, but also imperative for the proper network design, management, and control.This paper employed actual wireless data that draw from well known archives of network traffic traces analysis the preliminary statistics and examined the non-stationarity of aggregate WLAN traffic by employing the unit-root tests. The results indicate that the upstream and downstream traffic are non-stationary at different levels of statistical significance.It also repeated the analysis for the first difference of these series. The findings show that these first difference series are stationary. These results show that aggregate traffic series are non-stationary and also integrated of order one. These provide guidance on modelling of wireless traffic in the future.