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Aiming to meet vehicle driving safety requirements in automakers, this essay firstly discusses the application of vehicle driving wandering test system. And the real-time performance and reliability of wireless AP communication are the premise in this test system. However, when the test situation is changed especially in strong electromagnetic situation, the communication will be easily interrupted, leading to the delay problem. In order to maintain the real-time performance, this essay proposes an improvement method through analyzing the timeline of dynamic communication progress from the perspective of transport layer in TCP/IP protocol. Then, based on the analysis of Markov Chain model of the communication process, it also discusses the potential factors of the delay problem and puts forward the time division strategy which can effectively complete the authentication in real-time.