Achieving global fairness at urban intersections using cooperative DSRC congestion control

Intersections are traffic hubs for urban road traffic as well as for Vehicular Ad-Hoc Networks (VANETs). Intersections are most valuable and communication has to be reliable there. Unfortunately Dedicated Short Range Communications (DSRC) congestion control mechanisms are optimized for local fairness and thus fail to guarantee the Quality of Service (QoS) at urban intersection. In fact, they lead to further deterioration of the QoS, because they suffer from the emerging hidden station problem. We analyze the capability of these algorithms to ensure a fair allocation of the resources by applying cooperation. Our results show that cooperative VANETs achieve global fairness and are fable to significantly increase the communication performance at urban intersections. The in-depth investigation of the different algorithms reveals their drawbacks and benefits under these conditions. We discuss our findings focusing on the scalability, the exposed station, and the volatility problem and propose techniques to solve them.

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