QoS evaluation of VANET routing protocols

Traffic jams and traffic accidents have become a major concern in current society. VANET (vehicle ad hoc network) is an emerging attractive application to solve such problems. Quality of service (QoS) in VANET becomes a hot topic own to its increasing challenge about unique features, such as limited transporting distance, high mobility, and poor link quality. The main goal of this paper is to analyze the main quality criteria among popular routing protocols with an integrated VANET test bed. Typical topology-based routing protocols are reviewed. To study QoS performance of different protocols, evaluating models of frame loss ratio, PSNR and connectivity probability are illustrated. Three typical routing protocols: DSDV, AODV and GPSR are chosed to testify the QoS according to the statistics result of video transmission over VANET testbed. QoS performance is analyzed under several conditions of different distance of routing data transmission and vehicles' arriving rate. Test results show that Pro-active protocol is not suitable for high mobility VANET, and Position-based hybrid protocol is more suitable for video transmission over VANET than Re-active protocol. Comparing with other research, the result shows that our model is better and more efficient for the evaluation platform.