Road aware QoS routing in VANETs

Vehicular Ad Hoc Network (VANET) is a subclass of Mobile Ad Hoc Network (MANET). QoS routing protocols are fundamental part of VANETs that aim to provide services with guaranteed quality. Existing routing protocols of MANET can be applied to VANETs as well but they do not perform well under the dynamic conditions of VANETs such as, fast moving nodes and frequent disconnections in the network. In this paper we propose a novel QoS routing protocol for VANETs. The proposed scheme takes a localization approach by a road segment as a road between intersections. Every road segment can calculate candidate paths with QoS parameters, and vehicles on intersections serve as the gateway nodes to calculate the weights for the routes on local road segments and select reliable route based on these weights to connect the road segments. Our proposed scheme is designed to improve the delivery ratio and end to end delay with guaranteed quality in highly mobile VANET environments. The simulation results show that our proposed scheme performs better than AODV in aforementioned performance metrics.