The recent rapid expansion of multimedia applications spectrum, ranging from infotainment to healthcare and mission-critical scenarios, has incited researchers from different disciplines to develop various tools and protocols to support such applications. Many people use multimedia data while they travel in different transportation means and thus they need various QoS levels based on the type of application they are running. Such data is usually transmitted through 3G/LTE networks; however, the unprecedented increase of multimedia data volume makes satisfying their requirements in terms of low delay and higher bandwidth a challenge. Many experts foresee that Vehicular Ad-hoc Networks (VANETs) technology can be an efficient offloading solution for 3G/LTE networks by providing cost-free and robust data exchange between cars as well as among their passengers. Although VANETs pave the way toward several novel safety and non-safety applications that promise enhanced driving security and comfort, they suffer from several issues due to their intrinsic features such as higher vehicles mobility, rapidly changing topology, etc. In this work, we propose an Enhanced version of AODV (En-AODV) protocol to deal with routes instability issue in VANETs. En-AODV leverages cross-layer information on the link quality combined with the knowledge of the final destination of the receiver vehicle to establish more stable routes. The obtained simulation results confirm the efficiency of En-AODV and highlight its supremacy over AODV under various metrics and scenarios. En-AODV has particularly proven its ability to establish stable routes while significantly reduce the overhead generated by control packets, freeing up the channel to carry more data packets.
Abstract-Greedy routing in VANETs requires some geographical informations, such as the source location and the destination location. The first one could be obtained using some localization devices like GPS receiver. However, the second one is provided by a location service. This later has a high overhead especially if it is implemented over V2V (vehicle to vehicle) communications. Many location services are well known as HLS, RLS, GLS.This paper is interested in reducing this overhead by using some Road Side Units (RSU) already deployed along the roads. We propose here a location service called "improved Reactive Location Service (iRLS)", which is an extension of the RLS service. The major difference is that RLS assumes only V2V communications and iRLS takes profit of a wireless backbone based on RSUs to catch the destination's position. This allows to reduce the overhead instead of flooding requests and also makes the communication faster since we will not have to wait to the request to reach the destination before receiving the response and then starting sending data. In our proposal, the closest RSU will reply with the actual location.In order to show the contribution of our approach, we have conducted some simulations that prove that iRLS outperforms any geographic protocol by using the V2I communications in terms of end-to-end delay which is one of the most important parameter. We considered also the ratio of packet received correctly by the destination vehicle (PDR), our protocol improves significantly this second parameter, and ensures more than 20% of packets received correctly
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