https:\/\/teams.microsoft.com\/l\/meetup-join\/19%3ameeting_YWI3ZTc0OTAtNGFhOC00NmRhLWFlZDAtOWU1YjAwN2RkOWY5%40thread.v2\/0?context=%7b%22Tid%22%3a%2290c7a20a-f34b-40bf-bc48-b9253b6f5d20%22%2c%22Oid%22%3a%22b894868e-cb95-4bc0-99ee-c5ca1656b27c%22%7d<\/a><\/p>\n\n\n\nMembres du jury :<\/strong><\/p>\n\n\n\nM. Noel CRESPI<\/strong>, Full professor, T\u00e9l\u00e9com SudParis, FRANCE – Directeur de these
Mme Emmanuelle ANCEAUME<\/strong>, Full professor, CNRS, University of Rennes, IRISA, FRANCE – Rapporteur
M. Abdelkader LAHMADI<\/strong>, Associate Professor, Universite de Lorraine, CNRS, INRIA, LORIA, FRANCE – Rapporteur
M. Roberto RIGGIO<\/strong>, Associate Professor, Information Engineering Department, Polytechnic University of Marche, ITALIE – Examinateur
Mme Thi-Mai-Trang NGUYEN<\/strong>, Full professor, Brunel L2TI, Universit\u00e9 Sorbonne Paris Nord, FRANCE – Examinateur
Mme Axel K\u00fcPPER<\/strong>, Full professor, Technische Universit\u00e4t Berlin, ALLEMAGNE – Examinateur
M. Emmanuel BERTIN<\/strong>, Associate Professor, Orange Innovation, FRANCE – CoDirecteur de these<\/p>\n\n\n\n\u00ab Cadre de collaboration bas\u00e9 sur la Blockchain pour les r\u00e9seaux cellulaires B5G et 6G \u00bb<\/h2>\n\n\n\npr\u00e9sent\u00e9 par Monsieur Nischal ARYAL<\/h2>\n\n\n\n
R\u00e9sum\u00e9 :<\/strong><\/p>\n\n\n\nL\u2019augmentation de la connectivit\u00e9 dans les r\u00e9seaux cellulaires a cr\u00e9\u00e9 une forte demande de services d\u2019une grande diversit\u00e9. Les op\u00e9rateurs mobiles, traditionnellement bas\u00e9s sur des architectures centralis\u00e9es et ind\u00e9pendantes, r\u00e9pondent de moins en moins bien aux besoins actuels tels que la faible latence, les communications massives entre machines et le tr\u00e8s haut d\u00e9bit. Pour r\u00e9pondre \u00e0 ces attentes, il devient n\u00e9cessaire de moderniser les infrastructures tout en favorisant une collaboration entre op\u00e9rateurs, fournisseurs de services et utilisateurs. Une telle approche permet un meilleur partage des ressources, une r\u00e9duction des co\u00fbts et une gestion plus respectueuse de l\u2019environnement. Cette collaboration se heurte toutefois \u00e0 des difficult\u00e9s. Les r\u00e9seaux cellulaires ont \u00e9t\u00e9 con\u00e7us il y a plusieurs d\u00e9cennies pour fonctionner de mani\u00e8re isol\u00e9e, avec un contr\u00f4le centralis\u00e9. L\u2019introduction de fonctions collaboratives peut accro\u00eetre la complexit\u00e9, augmenter les co\u00fbts et introduire de nouvelles vuln\u00e9rabilit\u00e9s, en particulier la d\u00e9pendance \u00e0 des points de d\u00e9faillance uniques et des probl\u00e8mes de s\u00e9curit\u00e9 et de confiance. Pour d\u00e9passer ces limites, les travaux de recherche ont explor\u00e9 des approches d\u00e9centralis\u00e9es. La Blockchain appara\u00eet comme une solution adapt\u00e9e car elle offre transparence, immuabilit\u00e9 et tra\u00e7abilit\u00e9. En supprimant le contr\u00f4le centralis\u00e9, elle renforce la confiance entre acteurs. L\u2019usage de Smart Contracts ajoute un m\u00e9canisme automatis\u00e9 pour g\u00e9rer les services et appliquer les accords, r\u00e9duisant ainsi la latence, la complexit\u00e9 et les co\u00fbts. Ce travail de th\u00e8se propose un cadre collaboratif bas\u00e9 sur la Blockchain, con\u00e7u pour les r\u00e9seaux multi-acteurs Beyond 5G et 6G. L\u2019objectif des travaux est de r\u00e9pondre \u00e0 quatre d\u00e9fis majeurs : \u00e9tablir la confiance, garantir la s\u00e9curit\u00e9, am\u00e9liorer l\u2019efficacit\u00e9 et r\u00e9duire les points de d\u00e9faillance uniques (single points of failure). La premi\u00e8re contribution concerne une nouvelle proc\u00e9dure d\u2019authentification et d\u2019accord de cl\u00e9s int\u00e9gr\u00e9e \u00e0 la blockchain. Fonctionnant comme une surcouche, elle d\u00e9centralise l\u2019authentification, r\u00e9duit la d\u00e9pendance aux autorit\u00e9s centrales et am\u00e9liore le passage \u00e0 l\u2019\u00e9chelle sans perturber les syst\u00e8mes existants. La deuxi\u00e8me contribution traite de la gestion dynamique des Service Level Agreements entre op\u00e9rateurs et fournisseurs. Les conditions sont n\u00e9goci\u00e9es et inscrites sur la blockchain sous forme de Smart Contracts. Ceux-ci appliquent et suivent automatiquement les engagements, assurent la transparence et r\u00e9duisent le besoin de supervision manuelle, tout en pr\u00e9voyant la d\u00e9tection et la sanction des violations. La troisi\u00e8me contribution concerne le partage s\u00e9curis\u00e9 de donn\u00e9es. Elle propose deux solutions compl\u00e9mentaires. La premi\u00e8re est fond\u00e9e sur une identit\u00e9 auto-souveraine, qui donne \u00e0 chaque entit\u00e9 une identit\u00e9 unique et permet un acc\u00e8s s\u00e9curis\u00e9 aux services sans divulguer de donn\u00e9es personnelles. La seconde repose sur un chiffrement bas\u00e9 sur les attributs, permettant aux utilisateurs de d\u00e9finir eux-m\u00eames les politiques d\u2019acc\u00e8s \u00e0 leurs donn\u00e9es. Pour valider ces propositions, un banc d\u2019essai hybride combinant Go Ethereum, OpenAirInterface et Magma a \u00e9t\u00e9 mis en place. Les r\u00e9sultats montrent que le syst\u00e8me peut \u00e9voluer pour accueillir de nombreux acteurs tout en maintenant des performances et une s\u00e9curit\u00e9 adapt\u00e9e aux diff\u00e9rents sc\u00e9narios. Enfin, ce travail identifie plusieurs d\u00e9fis \u00e0 surmonter avant une adoption r\u00e9elle, comme la latence des op\u00e9rations blockchain, la conformit\u00e9 aux normes en \u00e9volution, les besoins de stockage plus \u00e9lev\u00e9s et la n\u00e9cessit\u00e9 de m\u00e9canismes incitatifs pour encourager la participation. Ces r\u00e9sultats ouvrent la voie \u00e0 de futures recherches pour concevoir des architectures collaboratives adapt\u00e9es aux r\u00e9seaux cellulaires de prochaine g\u00e9n\u00e9ration.<\/p>\n\n\n\n
Abstract :<\/strong><\/p>\n\n\n\nThe rapid increase in connectivity within cellular networks has created a strong demand for diverse and high-quality services. Mobile network operators, traditionally built on centralized and independent architectures, are struggling to meet current needs such as low latency, massive machine-type communications, and enhanced mobile broadband. To address these demands, it has become necessary to modernize infrastructures while fostering collaboration between operators, service providers, and end users. Such cooperation enables better resource sharing, reduced costs, and more environmentally sustainable management. This collaboration, however, faces challenges. Cellular networks were designed decades ago to operate independently, relying on centralized control. The introduction of collaborative functions may increase system complexity, raise operational costs, and create new vulnerabilities, especially the dependence on single points of failure and issues of security and trust. To overcome these limitations, research is actively exploring decentralized approaches. Blockchain emerges as a promising solution, as it provides transparency, immutability, and traceability. By eliminating centralized control, it strengthens trust among stakeholders. The use of smart contracts adds automated mechanisms for service management and agreement enforcement, reducing latency, complexity, and costs. This work proposes a blockchain-based collaborative framework tailored for multi-actor cellular networks in the Beyond 5G and 6G era. The objective is to address four critical challenges: building trust, ensuring security, improving efficiency, and reducing single points of failure. The first contribution introduces a new authentication and key agreement procedure integrated with blockchain. Operating as an overlay, it decentralizes authentication, reduces dependence on central authorities, and enhances scalability without disrupting existing systems. The second contribution focuses on the dynamic management of service-level agreements between operators and service providers. The terms are negotiated and deployed on the blockchain as smart contracts. These contracts automatically enforce and monitor commitments, ensure transparency, and reduce the need for manual supervision, while also enabling detection and resolution of violations. The third contribution addresses secure data sharing. Two complementary solutions are proposed. The first relies on self-sovereign identity, which provides each entity with a unique identity and allows secure service access without disclosing personal information. The second is based on attribute-based encryption, enabling users to define access policies and retain control over their personal data. To validate the feasibility of these contributions, a hybrid testbed combining Go Ethereum, OpenAirInterface, and Magma was developed. The results demonstrate that the system can scale to support a large number of actors while maintaining performance and security across diverse scenarios. Finally, this work identifies several challenges to be addressed before real-world deployment, including blockchain-related latency, compliance with evolving standards, increased storage requirements, and the need for incentive mechanisms to encourage stakeholder participation. These findings provide a foundation for future research on designing collaborative architectures for next-generation cellular networks.<\/p>\n\n\n\n
<\/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 Monsieur Nischal ARYAL Autoris\u00e9 \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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