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Vehicle-to-infrastructure and vehicle-to-vehicle communications has beenintroduced to provide high rate Internet connectivity to vehicles to meet theubiquitous coverage and increasing high-data rate internet and multimediademands by utilizing the 802.11 access points (APs) used along the roadside. Inorder to evaluate the performance of vehicular networks over WLAN, in thispaper, we investigate the transmisison and network performance of vehicles thatpass through AP by condidering contention nature of vehicles over 802.11 WLANs.Firstly, we derived an analytical traffic model to obtain the number ofvehicles under transmision range of an AP. Then, incorporating vehicle trafficmodel with Markov chain model and for arrival packets, MG1K queuing system, wedeveloped a model evaluating the performance of DCF mechanism with an optimalretransmission number. Based on traffic model, we also derived the probabilityof mean arrival rate to AP. A distinctive aspect of our work is that itincorporates both vehicular traffic model and backoff procedure with M/G/1/Kqueuing model to investigate the impact of various traffic load conditions andsystem parameters on the vehicular network system. Based on our model, we showthat the delay and througput performance of the system reduces with theincreasing vehicle velocity due to optimal retransmision number m, which isadaptively adjusted in the network with vehicle mobility.

Analytical models and performance evaluation of vehicular-to-infrastructure networks with optimal retransmission number