This paper aims to analyze two major quantities related to the performances of IEEE 802.11p based Vehicle Ad hoc NETwork (VANET): the mean number of simultaneous transmitters and the distribution of the distance between them. This first quantity is directly related to the network capacity as it limits the number of frames transmitted in the network at the same time. The second quantity is a crucial element to describe interference generated by the simultaneous transmitters and to deduce important wireless properties such as the Signal on Noise plus Interference ratio, Bit Error Rate or the Frame Error Rate. We propose two different models to approach these quantities: an extension of the Rényi's packing model and a Markovian point process. Theoretical propositions are compared to simulations performed with the Network Simulator NS-3. These simulations have been improved in two ways. The radio model has been set according to real experimentations. These experimentations involved two vehicles equipped with IEEE 802.11p wireless cards. Also, we implemented a realistic vehicles traffic simulator, emulating highway traffic, that we combined with NS-3.
International audienceIn this paper, we propose a simple theoretical model to compute the maximum spatial reuse feasible in a VANET. We focus on the ad hoc mode of the IEEE 802.11p standard. Our model offers simple and closed-form formulas on the maximum number of simultaneous transmitters, and on the distribution of the distance between them. It leads to an accurate upper bound on the maximum capacity. In order to validate our approach, results from the analytical models are compared to simulations performed with the network simulator NS-3. We take into account different traffic distributions (traffic of vehicles), and study the impact of this traffic on capacity. An application of this work is the parameterization of the CSMA/CA mechanism. Such an optimization is developed at the end of this paper
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