Joseph Mouzna

CATS: An adaptive traffic signal system based on car-to-car communication

Abstract Traffic signal controls play an important role in regulating vehicular flow at road intersections. Traditional systems are not capable of adjusting the timing pattern in accordance with vehicular demand. This results in excessive delays for road users. Hence it is necessary to develop dynamic systems that can adjust the timing patterns according to traffic demand. In this paper, the design and implementation of an adaptive traffic signal control system based on car-to-car communication is presented. Also, a clustering algorithm is defined which will assist in estimating the density of vehicles approaching an intersection. The cycle time, which is calculated using the estimated density of vehicular traffic, helps in reducing both the waiting time for vehicles at intersections and queue length. It is also shown that the proposed solution is collision free at intersections. The proposed system is compared with a classic pre-timed system and an adaptive fuzzy logic system. The simulations also show that the data convergence time and the communication delay between vehicles and traffic signals do not compromise the efficiency of the system.

Improvement of Zigbee Routing Protocol

ZigBee is a standard based on the IEEE 802.15.4 standard for wireless personal networks. Its use in Wireless Sensor Networks (WSNs) has aroused a great interest in the research community in the last years. In this paper, a synthetic study to analyze the performances and improve the routing protocols in WSNs is given and we were interested in routing mechanisms defined by the ZigBee standard. Multiple routing protocols have been developed to find optimized routes from a source to destination. ZigBee routing protocol uses a modified AODV by default and Hierarchical Tree Routing as last resort. The scope of this work is to improve the existing protocol to take the scalability into account and use it in tree topology in a variable network sizes up to hundreds of nodes. This paper describes the different routing protocols, our proposed solution ZBR-M and finally it presents and discusses the obtained results.

Routing in Vehicular Ad Hoc Networks: towards Road-Connectivity Based Routing

The proliferation of wireless technologies has inspired researchers from both academia and automotive industry to integrate advanced capabilities to the vehicles and provide new services and mobile applications. In particular, vehicular networks have emerged as a novel class of Mobile Ad Hoc Networks (MANETs) formed between moving vehicles equipped with wireless devices. Based on multi-hop communications, these self-organizing networks enable data exchanges among nearby vehicles and between vehicles and the road side infrastructure. Driven by the transportation safety and efficiency issues, Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communications are attracting considerable attention in providing Intelligent Transportation Systems (ITS). In this context, a variety of services are offered to road users for improving their security and comfort. These emerging applications include among others safety applications for traffic monitoring and collision prevention, road information services, and infotainment and so on. However, unlike other ad hoc networks, Vehicular ad hoc Networks (VANETs) have their unique characteristics which give rise to many challenging issues. One of the most salient features is the high mobility of vehicles resulting in dynamic topology changes. Accordingly, data routing remains a key networking issue that needs to be addressed in order to support the emerging applications. Over the last decades, many efforts have been concerted to design efficient routing protocols after recognizing the inefficiency of traditional MANET protocols to meet the requirements of vehicular environments. This chapter presents an analysis of the routing problem in vehicular ad hoc networks. First, it discusses the main characteristics and challenges of VANETs that distinguish them from the traditional MANETs. Then, it reviews the most relevant routing strategies proposed in the research community highlighting their advantages and disadvantages. Based on these considerations, we introduce a new class of geographic routing protocols called RCBR, Road Connectivity-based Routing for vehicular networks. The proposed approach exploits information about road connectivity and vehicles distribution to find stable routes and reduce the probability of links breakage. Simulations results are used to show how traffic awareness combined with a spatial knowledge of the environment can optimize the routing decisions in high dynamic networks.

Intelligent navigation system-based optimization of the energy consumption

The aim of this work is to design and build by 2015 an electric four-seater equipped with an autonomous extension device. The project was born from two observations: in a context of necessary diversification of energy sources and the development of electric vehicles, the main problem remains the battery life and availability of charging stations. The issue of our work lies both in the optimization of energy consumption and improving the electric vehicle. Our team was tasked to develop and implement an Energy Management System of Electric Vehicle. The objective of the mission is to create a program that calculates the set speed to minimize the cost of energy consumption and maximize battery life. This calculation is done by taking into account prevention parameters are: vehicle speed, real-time parameters from Maps (elevations in the path, wind speed, etc.), the forces applied to the vehicle.

Investigation and Implementation of T-DMB Protocol in NCTUns Simulator

Investigation of T-DMB protocol forced us to create simulation model. NCTUns simulator which is open source software and allows addition of new protocols was chosen for implementation. This is one of the first steps of research process. Here we would like to give small overview of T-DMB (DAB) system, describe proposed simulation model and problems which we have met during the work.

Comparison of error-correcting schemes in T-DMB and DAB systems

Quality estimation of data transmission is a high priority goal of data transmission systems research. Estimation from the side of used error-correcting schemes efficiency can be one of the solutions. In this paper we would like to show the results of the comparison of error-correcting schemes in T-DMB and DAB protocols in conditions of data transmission between moving subscribers. These results are represented as a graph of dependence probability of error from Signal-to-Noise ratio and show the gain when using T-DMB for transmission of multimedia services in mobile channels. We show that using T-DMB for data transmission in the mobile channel can provide high quality transmission. NCTUns implementation model was used during this work.