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Actualités de l'école

05/09/2017

Doctorate thesis defense of Imen Achour ép. Mtar




Doctorate thesis defense on September 5th 2017 at 09H00 ,in Amphi I, Sup’Com 2.


Entitled :Data Dissemination Protocols for Vehicular Ad hoc

Presented by :Imen Achour ép. Mtar





Committee


President

M. Ridha BOUALLEGUE

Professor at Sup'Com, Tunisia

 

 

 

Examiner

Mlle Soumaya Hammouda

Associate Professor at FSB, Tunisia

 

Reviewers

M. Aref Meddeb

Professor at ENISO, Tunisia

 

M. Farid Naït-Abdesselam

Professor at Paris Descartes University, France

 

Thesis Director

Pr. Sami Tabbane

Sup’Com School of Communication Engineering of Tunis

 

Abstract


The Vehicular Ad Hoc NETwork (VANET) is currently gaining momentum amongst research communities and automobile industries since its main objective is to enhance the safety and the efficiency of Intelligent Transportation Systems (ITSs). A wide variety of applications is supported by VANET ranging from road safety and traffic management to infotainment and content distribution applications.


The present thesis comes within this context aiming at investigating and proposing innovative and efficient data dissemination protocols essentially dealing with safety applications via a Vehicle-to-Vehicle communication.


At first, we propose a deep review of the different data dissemination protocols categories. A classification of these protocol and a study regarding their convenience to the different VANET applications' requirements, is carried out.


Afterward, a new trend of protocol design based on the Network Coding (NC) concept is tackled. Therefore, a classification of the different network coding based protocols appeared in the literature is proposed while highlighting the gain achieved once this technique is applied. However, simulation scenarios performed on some broadcast protocols in combination with the NC scheme reveal that although such technique enhances reliability in sparse network, it suffers from a high end-to-end transmission delay in both dense and sparse network. Due to the decoding process, NC scheme could not be an outstanding solution for safety message dissemination.


Based on this study, we propose an efficient Redundancy Based Protocol (RBP) dedicated to safety message dissemination. Simulation results show that this protocol is able to achieve a high packet reachability within an acceptable transmission delay while reducing the network resources consumption.


An enhancement of RBP protocol is subsequently implemented in an attempt to make it more generic and adaptive to different applications according to their performance's needs. The proposed protocol, called, Simple and Efficient Adaptive Data dissemination protocol (SEAD) needs some parameters configuration to be rigorously adjusted. Thus, an analytical model of the packet delivery ratio and the amount of redundant packets is elaborated. Thereafter, the faithful values of the configuration parameters is determined.