为了分析802.11接入网类型对延迟抖动的影响,基于对802.11DCF(distributed coordinated function)信道访问机制的分析与马尔可夫模型,提出一个802.11无线接入的TCP连接本地延迟抖动(local jitter,UITTER)分布模型。实际网络的测试实验数据证明,该模型非常吻合802.11无线接入的TCPUITTER实际分布。该模型可以用于接入网类型区分、数据包流量分类、TCP协议改进与非法AP检测。
In order to highlight the impact of access network' s types ( Ethemet or WLAN) upon TCP delay jitter, an analytical model of the TCP local jitter for 802.11 wireless access was derived based on the analysis of IEEE 802.11 MAC DCF and Markov chain model. The experimental data shows that this analytical model is consistent with the real distribution of TCP LJITTER for 802.11 wireless access. This model can be used for distinction between Ethernet access and 802.11 wireless access, flow classification, TCP protocol improvement and rogue AP detection.