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Actualités de l'école

01/07/2020

Doctorate thesis defense of Maroua Gharam




Doctorate thesis defense on July 1st 2020 at 10H00 ,in Sup’Com Amphitheater Ibn Khaldoun.


Entitled :Security and QoS provisioning in 4G networks and beyond

Presented by :Maroua Gharam


Committee


President :

Pr. Chiheb Rebai

Professor, Higher School of Communication of Tunis, SUP’Com, Tunisia.

 

 

 

Examiners :

Pr. Taher Ezzedine

Professor, National Engineering School of Tunis, ENIT, Tunisia

 

Pr. Lamia Chaari

Professor, Higher Institute of Computer Science and Multimedia of Sfax, ISIMS, Tunisia

 

Member :

Pr. Fethi Tlili

Professor, Higher School of Communication of Tunis, SUP’Com, Tunisia

 

 

 

Thesis Supervisor :

Pr. Noureddine Boudriga

Professor, Higher School of Communication of Tunis, SUP’Com, Tunisia


Abstract


Over the last few years, we have witnessed an exponential increase in the quantity of traffic carried through mobile networks. In addition, with the creation of additional services and applications, such as Ultra‐High Definition (UHD) and 3D video as well as the augmented reality and immersive experience, new traffic requirements to the network could be imposed. In parallel, social networking has become important for mobile users while introducing a new consumption behavior and a considerable amount of mobile data traffic. Connecting such large number of mobile devices, while providing the required data rates and latency, has placed new demands in 4G networks and beyond to meet the new customers’ needs. This thesis addresses the development of architectures and techniques dealing with the customers’ needs by enhancing the security and the quality of service in 4G networks and beyond. Consequently, the main contributions of the thesis are fourth-fold.


First, we designed a new architecture for LTE based VPN networks allowing companies to establish secure channels between its divisions connected through small-cells and to securely encapsulate the traffic of its users on the 4G network. Second, we designed a novel authentication scheme based on an agreement graph for users and machines allowing seamless handover within 5G Heterogeneous networks.


Third, we proposed a fully distributed multiple access control (CSMA-CA) based algorithm for millimeter wave WPAN networks, where the carrier sense threshold and the persistence probability are intelligently tuned according to the collision level gathered by the device on the shared wireless medium until reaching the equilibrium state.


Fourth, we used game theory to deal with two 5G HetNets issues; cell selection and resource allocation. Therefore, two noncooperative game theoretical models are formulated taking into consideration a set of parameters including the SINR level, the requested QoS, and the access point capability.


Keywords :


G, 5G, Heterogeneous networks, security, QoS, Game theory