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Efficiency applications in VANETs are focused on increasing the productivity of the road resources by managing the traffic flow and monitoring the road conditions. The performance of most such applications is dependent on an effective density estimation of the vehicles in the surroundings. Of the various methods, clustering demonstrates to be an effective concept to implement this. However due to...
This paper proposes a novel MAC sub-layer mechanism in order to improve reliability of emergency message dissemination in Vehicular Ad-hoc Networks. We consider a VANET that uses IEEE 802.11e MAC sub-layer. We propose enhancements in the multi-access policies of the original IEEE 802.11e standard in order to automatically reduce the volume of data traffic for non-safety applications allowing less...
Vehicular ad hoc networks (VANETs) provide the communications required to deploy Intelligent Transportation Systems (ITS). In the current state of the art in this field there is a lack of studies on real outdoor experiments to validate the new VANETs protocols and applications proposed by designers. In this work we have addressed the definition of a testbed in order to study the performance of the...
In this paper, we present a cluster-based slot allocation (SLA) algorithm for vehicle communications in VANETs. The proposed CSA uses a simple transmit-and-listen scheme to fast elect a VC (VANET Coordinator). Additionally, without restricting the number of nodes, CSA allows a VN (VANET node) to randomly choose a time slot for bandwidth requests. To evaluate the proposed CSA, we derive mathematical...
A VANET consists of vehicles equipped with on board units (OBUs) that can communicate with each other and the road side base stations. Due to the mobility and sparse distribution of vehicles, the delivery delay of messages in the VANET is mainly caused by the message transmissions between vehicles. The message delivery delay directly impacts the deployment of applications in VANET, and hence, an in-depth...
Wireless technologies can help solve traffic congestions in urban environments, where road infrastructures develop slower than the sometimes exponential growth in the number of cars in traffic. We present a model for traffic control and congestion avoidance developed over a vehicular ad-hoc network created between the cars in traffic and the road infrastructure. We propose a solution for monitoring...
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