5G-NTN GEO-based In-lab demonstrator using OpenAirInterface5G

Kumar, Sumit; Astro, Abdelrahman; Kodheli, Oltjon; Querol, Jorge; Chatzinotas, Symeon; Schlichter, Thomas; Casati, Guido; Heyn, Thomas; Völk, Florian; Kaya, Sertac; Schwarz, Robert T; Knopp, Andreas; Kapovits, Adam; Kaltenberger, Florian
ASMS/SPSC 2022, 11th Advanced Satellite Multimedia Systems Conference and the 17th Signal Processing for Space Communications Workshop, 6-8 September 2022, Graz, Austria

The integration of 5G with Non-Terrestrial Network (NTN) components is going through a series of technological advancements and soon satellites will be a part of the 5G ecosystem. Early demonstrators, especially based on open-source implementations, are essential to support further research. In this work, we discuss the ongoing activities and developments related to the project 5G-Enabled Ground Segment Technologies Over-The-Air Demonstrator (5G-GoA) which has been funded under the ESA-ARTES program. The vision of 5G-GoA is developing and implementing suitable modifications in the 5G New Radio (NR) standard for enabling direct radio access to 5G services
using a transparent GEO satellite. For this purpose, we have used OpenAirInterface(OAI) which is a Software Defined Radio (SDR) based open-source implementation of the 5G-NR protocol stack. We adapted it to address the challenges caused by the excessive round-trip delay in GEO satellites. Our solutions encompass all the layers of the 5G protocol stack: The physical layer (e.g. synchronization) up to upper layer implementations (e.g. timers and random-access procedure) of the Radio Access Network. Our modifications comply with the specifications mentioned for 5GNTN in the recently frozen 3GPP Release-17. An end-to-end demonstrator has been developed for in-lab validation over a satellite channel emulator prior to over-the-satellite testing. Our initial experiments show promising results and the feasibility of direct access to 5G services through transparent GEO satellites.

Communication systems
Eurecom Ref:
© 2022 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

PERMALINK : https://www.eurecom.fr/publication/7023