https:\/\/zoom.us\/j\/2445226856<\/a><\/p>\n\n\n\nMembres du jury :<\/strong><\/p>\n\n\n\nM. Noel CRESPI<\/strong>, Professeur, T\u00e9l\u00e9com SudParis, FRANCE – Directeur de these
M. Emmanuel BERTIN<\/strong>, Ing\u00e9nieur de recherche, Orange Innovation, FRANCE – CoDirecteur de these
Mme Emmanuelle ANCEAUME<\/strong>, Directrice de recherche, Institut de recherche en informatique et syst\u00e8mes al\u00e9atoires, FRANCE – Examinateur
M. Abdelkader LAHMADI<\/strong>, Professeure associ\u00e9e, Universite\u00b4 de Lorraine, CNRS, Inria, Loria, Nancy, France, FRANCE – Examinateur
Mme Cigdem SENGUL<\/strong>, Ing\u00e9nieur de recherche, Brunel University England, ROYAUME-UNI – Examinateur<\/p>\n\n\n\nM. Axel KUPPER<\/em><\/strong>, <\/em>Professor, Technische Universit\u00e4t Berlin, ALLEMAGNE \u2013 Rapporteur<\/p>\n\n\n\nM. Mika YLIANTTILA<\/strong>, Professor, Center for Wireless Communications, University of Oulu, Finland, FINLANDE – Rapporteur<\/p>\n\n\n\n\u00ab Une nouvelle architecture bas\u00e9e sur la blockchain pour les op\u00e9rateurs de r\u00e9seaux mobiles : au-del\u00e0 de la 5G et de la 6G \u00bb<\/h2>\n\n\n\npr\u00e9sent\u00e9 par Madame Fariba GHAFFARI<\/h2>\n\n\n\n
R\u00e9sum\u00e9 :<\/strong><\/p>\n\n\n\nSi l’architecture centralis\u00e9e et autonome des op\u00e9rateurs de r\u00e9seaux mobiles (MNO) fournit une connectivit\u00e9 \u00e0 des milliards d’utilisateurs, elle souffre d’un manque de m\u00e9canismes techniques pour am\u00e9liorer la collaboration entre les MNO et d’autres fournisseurs. Cela a des r\u00e9percussions sur les co\u00fbts de mutualisation, ainsi que sur la consommation d’\u00e9nergie et l’impact environnemental. Cela peut \u00e9galement emp\u00eacher l’av\u00e8nement de mod\u00e8les commerciaux plus collaboratifs avec d’autres fournisseurs ou m\u00eame avec les clients. En outre, la complexit\u00e9 des r\u00e9seaux 5G et au-del\u00e0 pourrait d\u00e9passer la capacit\u00e9 d’un MNO \u00e0 g\u00e9rer le co\u00fbt et la complexit\u00e9 de la connexion. Enfin, les architectures existantes des MNO souffrent \u00e9galement de leur centralisation, ce qui entra\u00eene probl\u00e8mes techniques et vuln\u00e9rabilit\u00e9s. Relever ces d\u00e9fis n’est pas chose ais\u00e9e. Les architectures MNO sont d\u00e9finies depuis pr\u00e8s de trois d\u00e9cennies par des organismes de normalisation bien \u00e9tablis. Cependant, nous pensons qu’il est int\u00e9ressant de proposer \u00e0 la communaut\u00e9 des chercheurs en t\u00e9l\u00e9communications une approche de type \u00ab\u00a0table rase\u00a0\u00bb. Ces solutions alternatives doivent -au moins- avoir un \u00e9cosyst\u00e8me distribu\u00e9\/d\u00e9centralis\u00e9, assurer la fiabilit\u00e9 entre les acteurs dans un environnement peu fiable, partager les ressources entre les parties prenantes, apporter une plus grande automatisation, et fournir une s\u00e9curit\u00e9 et une confidentialit\u00e9 suffisantes. Toute alternative r\u00e9pondant \u00e0 ces exigences constituerait une solution potentielle prometteuse. La blockchain est un grand ledger distribu\u00e9 pair-\u00e0-pair, une technologie cryptographiquement s\u00e9curis\u00e9e, \u00e0 appendice unique, immuable, tra\u00e7able et transparente qui ne peut \u00eatre mise \u00e0 jour que par consensus entre la majorit\u00e9 des n\u0153uds participants sur le r\u00e9seau. En raison de ses caract\u00e9ristiques intrins\u00e8ques, la blockchain et les Smart Contracts peuvent r\u00e9duire le co\u00fbt, la latence et la complexit\u00e9 de la collaboration entre les entit\u00e9s dans un r\u00e9seau cellulaire multi-acteurs tout en augmentant la fiabilit\u00e9, la tra\u00e7abilit\u00e9 et les capacit\u00e9s de supervision. Ce travail propose un syst\u00e8me de connectivit\u00e9 mobile multi-acteurs qui fournit une solution distribu\u00e9e, fiable, automatis\u00e9e, peu co\u00fbteuse et s\u00e9curis\u00e9e pour les entit\u00e9s et les acteurs de l’\u00e9cosyst\u00e8me du r\u00e9seau cellulaire. Pour ce faire, ce travail fournit tout d’abord une \u00e9tude compl\u00e8te des d\u00e9fis existants dans les r\u00e9seaux cellulaires actuels en ce qui concerne les aspects commerciaux et de collaboration, les questions techniques et la s\u00e9curit\u00e9. Les r\u00e9sultats de ces \u00e9tudes nous ont conduits \u00e0 proposer deux contributions principales, l’une concernant la coop\u00e9ration entre les diff\u00e9rents acteurs de l’\u00e9cosyst\u00e8me des r\u00e9seaux cellulaires (c’est-\u00e0-dire les MNO, les fournisseurs de services, les petites entreprises, les vendeurs et les utilisateurs finaux) et l’autre concernant la collaboration entre les MNO (et potentiellement avec les organismes de r\u00e9glementation) pour la gestion des identit\u00e9s et des profils. <\/em>Plus pr\u00e9cis\u00e9ment, la premi\u00e8re contribution propose un nouvel \u00e9cosyst\u00e8me de t\u00e9l\u00e9communication hybride (distribu\u00e9-d\u00e9centralis\u00e9) pour fa\u00e7onner la conception des r\u00e9seaux 5G et 6G. Cette m\u00e9thode permet d’\u00e9liminer toute autorit\u00e9 centrale, d’augmenter la tol\u00e9rance aux pannes du syst\u00e8me, de simplifier les proc\u00e9dures informatiques et de fournir des paiements s\u00e9curis\u00e9s entre les entit\u00e9s. La deuxi\u00e8me contribution introduit une nouvelle gestion du profil de l’utilisateur et un portage du num\u00e9ro de t\u00e9l\u00e9phone mobile et du profil sur la base de la blockchain et des Smart Contracts. Cette m\u00e9thode vise \u00e0 \u00e9liminer l’autorit\u00e9 centrale dans la proc\u00e9dure de portage en cr\u00e9ant un syst\u00e8me plus collaboratif et distribu\u00e9 \u00e0 cette fin, \u00e0 augmenter l’automatisation et la confiance, et \u00e0 traiter la latence \u00e9lev\u00e9e de la m\u00e9thode existante pour le portage des MNO. En outre, il offre la possibilit\u00e9 de porter les profils des utilisateurs vers le MNO destinataire ainsi que le num\u00e9ro de t\u00e9l\u00e9phone au moyen d’une proc\u00e9dure automatis\u00e9e sans autorit\u00e9 centralis\u00e9e ni tierce partie. Pour \u00e9valuer le syst\u00e8me propos\u00e9 et analyser la faisabilit\u00e9 de sa mise en \u0153uvre, nous avons propos\u00e9 trois sc\u00e9narios de d\u00e9ploiement dans lesquels la blockchain peut \u00eatre logiquement positionn\u00e9e soit dans le RAN, soit dans le r\u00e9seau coeur, soit dans la couche de service. Les r\u00e9sultats de l’\u00e9valuation montrent que le syst\u00e8me est suffisamment \u00e9volutif en ce qui concerne le nombre d’acteurs et de collaborateurs, et en fonction des exigences du r\u00e9seau, sa performance et son niveau de s\u00e9curit\u00e9 sont ajustables.<\/em>
Abstract :<\/strong><\/p>\n\n\n\nWhile the existing centralized and stand-alone architecture of Mobile Network Operators (MNO) provides connectivity to billions of users, they suffer from a lack of technical mechanisms to enhance collaboration between MNOs and other providers. This has impacts on mutualization costs, as well as on energy consumption and environmental impact. This may also prevent the advent of more collaborative business models with other providers or even with customers. Moreover, the complexity of 5G and beyond 5G networks may surpass the capability of one MNO to manage the cost and the complexity of connection. Finally, existing MNO architectures also suffer from their centralization, resulting in several technical issues and vulnerabilities. Addressing these challenges is not a straightforward journey. MNO architectures have been defined for nearly three decades by well-established standardization bodies. However, we believe there is an interest in proposing to the telecom research community a clean-slate approach. Such alternative solutions need to -at least- have a distributed\/ decentralized ecosystem, provide trustworthiness between actors in the distrusted environment, share the resources among stakeholders, bring higher automation, and provide sufficient security and privacy. Any alternative addressing these requirements would be a promising potential solution. Blockchain is a peer-to-peer distributed ledger, cryptographically secure, append-only, immutable, traceable, and transparent technology that is only updateable via consensus among a majority of the participating nodes on the network. Due to its intrinsic features, Blockchain, and smart contracts can decrease the cost, latency, and complexity of collaboration among entities in multi-actor cellular network while increasing the trustworthiness, traceability, and supervision abilities. This work proposes a multi-actor mobile connectivity system that provides a distributed, trustful, automated, low-cost, and secure solution for the entities and actors of the cellular network ecosystem. To do so, this work provides at first a comprehensive study of the existing challenges in current cellular networks regarding business and collaboration aspects, technical issues, and security. The results of these studies have led us to propose two main contributions, one regarding the cooperation among different actors of the cellular network ecosystem (i.e., MNOs, service providers, small-scale businesses, vendors, and end-users) and another for collaboration among MNOs (and potentially with regulation bodies) for identity and profile management. More precisely, the first contribution proposes a novel hybrid (distributed-decentralized) telecommunication ecosystem to shape the beyond 5G and 6G network design. This method provides the opportunity to eliminate any central authority, increase the fault tolerance of the system, simplifies IT procedures, and provide secure payment among entities. The second contribution introduces a new user profile management and mobile number and profile porting on top of Blockchain and smart contracts. This method aims to eliminate the central authority in the porting procedure by creating a more collaborative and distributed system to this aim, increase automation and trustfulness, and address the high latency of the existing method for porting the MNOs. Moreover, it brings the opportunity of porting the users’ profiles to the recipient MNO as well as the phone number with an automated procedure without a centralized authority or third parties. To evaluate the proposed system and analyze its implementation feasibility, we proposed three deployment scenarios in which the Blockchain can be logically positioned either in RAN, core network, or service layer. The evaluation results show that the system is scalable enough regarding the number of actors and collaborators, and based on the network requirements, its performance and security level are adjustable.<\/p>\n","protected":false},"excerpt":{"rendered":"
L’Ecole doctorale : Ecole Doctorale de l’Institut Polytechnique de Paris et le Laboratoire de recherche SAMOVAR – Services r\u00e9partis, Architectures, Mod\u00e9lisation, Validation, Administration des R\u00e9seaux pr\u00e9sentent l\u2019AVIS DE SOUTENANCE de Madame Fariba GHAFFARI Autoris\u00e9e \u00e0 pr\u00e9senter ses travaux en vue de l\u2019obtention du Doctorat de l’Institut Polytechnique de Paris, pr\u00e9par\u00e9 \u00e0 T\u00e9l\u00e9com SudParis en : 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