Research in the past has focused on many areas from the Physical, MAC, Network, Application to the Security and Management Layers.Each Layer has its own challenges that add up to the overall performance of the DSRC.The Physical layer has been studied in terms of channel selection and estimation schemes, diversity schemes, propagation models, and cognitive radios.
Research in the past has focused on many areas from the Physical, MAC, Network, Application to the Security and Management Layers.Each Layer has its own challenges that add up to the overall performance of the DSRC.The Physical layer has been studied in terms of channel selection and estimation schemes, diversity schemes, propagation models, and cognitive radios.Tags: Conjuguer Le Verbe Essayer A L'Imparfait De L'IndicatifWeb Dubois The Souls Of Black Folk EssayHow To Write An Essay ResponseCollege Essay ExaplesRacism Paper ThesisAnalysis Of Results DissertationTolstoy Essay ShakespeareCritical Essay On The Scarlet Ibis
The Physical (PHY) and MAC Layer challenges presented in  explains in depth the Channel Estimation at PHY layer and behavior of Carrier Sense Multiple Access (CSMA) in high node density and potential solutions to the congestion control along with the Multi-Channel Operations in IEEE 1609.4.
The performance using Single and Multiple Radios has been discussed along with some simulation results.
For this purpose, Wi-Fi based standard like DSRC was introduced in order to fulfill the requirements of the users for both safety and non-safety applications.
While LTE based vehicular networks are being researched for the future in order to overcome the shortcomings of the DSRC.
The RSUs are in turn connected to the external network which includes the internet cloud.
The V2I communication takes place between the RSUs and OBUs for providing the internet services, weather conditions, and other infotainment applications.The aim of all is to improve the performance of the network and support scalability in VANETs; which is defined as the ability of the network to handle the addition of vehicles (nodes) without suffering noticeable degradation of performance or administrative overhead.In this paper, we aim to highlight multilayer challenges concerning the performance of the VANETs, the already proposed solutions, and the possible future work.The Routing layer has been studied in terms of different routing protocols and the advantages of cross layer routing protocols.Finally, future research directions and ongoing research in the fields of VANETs are discussed.This paper also gives a layered view of the various underlying challenges in VANETs.But the work has been limited to the Routing, Security, and Application Layers.DSRC; V2V; V2I; VANET; MAC; WAVE; Carrier Sense Multiple Access (CSMA); Time Division Multiple Access (TDMA); PHY; Self Organized Time Division Multiple Access (STDMA); Cognitive Radios (CR); Vehicle-to-Everything (V2X)Roadside accidents have increased significantly due to high traffic on highways and urban areas.In order to provide a reliable driving experience and avoiding accidents, vehicular communication was introduced to provide safety and to increase the travel experience of the user by providing on demand infotainment services.The rest of the paper is structured as follow: Section 2 discusses the Multi-Layer Challenges in VANETs, along with the proposed solutions.Section 3 focuses on the current trends in research and the future work, and finally Section 4 concludes the paper.