Fairness and Stability Analysis of Congestion Control Schemes in Vehicular Ad-Hoc Networks

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Cooperative Vehicle Safety (CVS) systems operate based on broadcast of vehicle position and safety information to neighboring cars. The communication medium of CVS is a vehicular ad-hoc network. One of the main challenges in large scale deployment of CVS systems is the issue of scalability. To address the scalability problem, several congestion control methods have been proposed and are currently under field study. These algorithms adapt transmission rate and power based on network measures such as channel busy ratio. The authors examine two such algorithms and study their dynamic behavior in time and space to evaluate stability (in time) and fairness (in space) properties of these algorithms. They present stability conditions and evaluate stability and fairness of the algorithms through simulation experiments.