PhD graduated
Team : DELYS
Departure date : 01/31/2022

Supervision : Marc SHAPIRO

Co-supervision : IMADALI Sofiane, MARTELLI Frédéric

A study of data consistency constraints in 5G, applied to limiting resource usage in network slices

The 5G network specification requires ACID properties (Atomicity, Consistency, Isolation, Durability) for its distributed database. According to the CAP theorem, these properties are incompatible with high availability for a geo-distributed system. Since availability is an obligation for mobile networks, this contradiction challenges the specification.
Our thesis focus on a study of the usage of data in the network that allow us to extract weaker consistency properties that are still sufficient to maintain the correctness of the data.
In the case a Network Slicing, an innovation of the 5G network, we propose to study further the enforcement of one of these properties, through the example of the enforcement of a global limit on the resource usage of a slice.
Slices are deployed over a potentially large area, and so is their data, which make the enforcement of a limit more challenging. We propose several algorithms placed at different points of the consistency spectrum and study their performance in a simulation of the 5G network.

Defence : 12/13/2021 - 14h30 -

Jury members :

Cédric TEDESCHI, Maître de Conférences, Université de Rennes I, laboratoire IRISA [Rapporteur]
Samia BOUZEFRANE, Professeure, CNAM, laboratoire CEDRIC [Rapporteur]
Brigitte KERVELLA, Maître de Conférences, Sorbonne Université, laboratoire LIP6
Julien MAISONNEUVE, Standardisation Manager, Nokia
Sébastien MONNET, Professeur, Université Savoie Mont Blanc, laboratoire LISTIC
Pierre SENS, Professeur, Sorbonne Université, laboratoire LIP6
Sofiane IMADALI, Chercheur, Orange Labs
Frédéric MARTELLI, Architecte de Services, Orange Labs
Marc SHAPIRO, Distinguished Research Scholar, Sorbonne Université & Inria, laboratoire LIP6

2020-2021 Publications