Deterministic QoS Guarantees in Next -Generation LEO Satellite Constellations

Low Earth Orbit (LEO) satellite constellations — such as Starlink, OneWeb, Kuiper, and Telesat Lightspeed — are rapidly becoming a cornerstone of next-generation communication infrastructures and future 6G networks.

With thousands of satellites orbiting at altitudes between 500 and 2000 km, these systems offer unprecedented global coverage combined with significantly lower latency than traditional geostationary systems. The emergence of LEO constellations opens transformative opportunities for time-sensitive applications. These applications demand deterministic end-to-end delay guarantees — strict, provable upper bounds on latency — rather than best-effort performance. However, providing such guarantees in LEO constellations remains an open and largely unsolved problem.

Preliminary research conducted at ISAE-SUPAERO has demonstrated that Network Calculus (NC), a mathematical framework for computing worst-case performance bounds in communication networks, can be successfully adapted to LEO satellite constellations. This PhD aims to develop a comprehensive analytical and algorithmic framework for deterministic QoS guarantees in dynamic LEO satellite constellations within a collaborative project PEPR FRONTIER funded by the ANR with many partners like CNRS, Sorbonne Université et mines-Telecom Bretagne.