基于饱和TCP流量的Wi-Fi级联吞吐量模型  

Throughput model of Wi-Fi cascading based on saturated TCP traffic

作　　者：张俊雄 刘剑钊[1] 葛晓虎[1] 吴伟民[1] ZHANG Junxiong;LIU Jianzhao;GE Xiaohu;WU Weimin(Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学,湖北武汉430074

出　　处：《物联网学报》2023年第3期53-61,共9页Chinese Journal on Internet of Things

基　　金：国家自然科学基金资助项目(No.U2001210)。

摘　　要：目前,无线保真(Wi-Fi,wireless fidelity)技术的重要性与商业价值已经获得了广泛认可,同时人们也追求更好的服务质量(QoS,quality of service)。传输控制协议(TCP,transmission control protocol)作为一种面向连接的、提供端到端可靠性服务的通信协议,其重要性也日益上升,是互联网中占主导地位的传输协议。此外,由于单个接入点(AP,accesspoint)的覆盖范围有限,在许多场景下往往需要通过级联来扩展覆盖范围。然而,现有的关于级联场景的研究均基于用户数据报协议(UDP,user datagram protocol),即认为场景中仅存在下行流量,而许多场景中上下行流量往往同时存在,即运行的是TCP流量,在级联场景下用户获得TCP吞吐量应如何计算一直是一个尚待解决的问题。针对该问题,首先在级联场景下建立了饱和TCP流量条件下的Wi-Fi吞吐量模型,该模型通过两个马尔可夫链实现对用户吞吐量的计算;其次,搭建了级联系统进行实测,通过对比理论仿真结果与实际测试结果,对模型的有效性进行了验证。At present,the importance and commercial value of wireless fidelity(Wi-Fi) technology have been widely recognized.And people are also pursuing better quality of service(QoS).Transmission control protocol(TCP) as a connection-oriented communication protocol that provides end-to-end reliability services,its importance is also increasing,and it is the dominant transmission protocol in the Internet.Besides,since the coverage of a single access point(AP) is limited,it is often necessary to extend the coverage through cascading in many scenarios.However,the current research on cascading scenarios is based on the user datagram protocol(UDP),which means that only downlink traffic exists in the scenario.Actually,uplink and downlink traffic often exist at the same time in many scenarios,which means TCP traffic is running.How to calculate the TCP throughput obtained by users in the cascading scenario has always been an unresolved problem.To solve this problem,firstly,a Wi-Fi throughput model under the condition of saturated TCP traffic was established in the cascading scenario,and the calculation of user throughput was realized through two Markov chains.Secondly,a cascading system was built and actual tests were conducted.The validity of the model is verified by comparing the theoretical simulation results with the actual test results.

关 键 词：WI-FI QOS TCP 吞吐量 

分 类 号：TN92[电子电信—通信与信息系统]