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-Performance of Vehicular Adhoc Networks (VANETs) in high node densitysituation has long been a major field of studies. Particular attention has beenpaid to the frequent exchange of Cooperative Awareness Messages (CAMs) on whichmany road safety applications rely. In the present paper, se focus on theEuropean Telecommunications Standard Institute (ETSI) Decentralized CongestionControl (DCC) mechanism, particularly on the evaluation of its facility layerscomponent when applied in the context of dense networks. For this purpose, aset of simulations has been conducted over several scenarios, considering ruralhighway and urban mobility in order to investigate unfairness and oscillationissues, and analyze the triggering factors. The experimental results show thatthe latest technical specification of the ETSI DCC presents a significantenhancement in terms of fairness. In contrast, the stability criterion leavesroom for improvement as channel load measurement presents (i) considerablefluctuations when only the facility layer control is applied and (i.i) severestate oscillation when different DCC control methods are combined.

An empirical study of Unfairness and Oscillation in ETSI DCC