@inproceedings{,
    author = {Kumar, Sumit; Astro, Abdelrahman; Kodheli, Oltjon; Querol, Jorge; Schlichter, Thomas; Casati, Guido; Heyn, Thomas; Völk, Florian; Kaya, Sertac; Schwarz, Robert T.; Knopp, Andreas; Kapovits, Adam; Kaltenberger, Florian},
    title = {5G-NTN GEO-based In-lab demonstrator using OpenAirInterface5G},
    editor = {},
    booktitle = {ASMS/SPSC 2022, 11th Advanced Satellite Multimedia Systems Conference and the 17th Signal Processing for Space Communications Workshop, 6-8 September 2022, Graz, Austria},
    series = {},
    journal = {},
    address = {},
    publisher = {EURECOM},
    edition = {},
    year = {2022},
    isbn = {},
    volume = {},
    number =  {},
    pages = {},
    url = {https://www.eurecom.fr/en/publication/7023},
    doi = {},
    keywords = {},
    abstract = {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 ofdirect access to 5G services through transparent GEO satellites.},
    note = {},
    institution = {Universität der Bundeswehr München, Fakultät für Elektrotechnik und Informationstechnik, EIT 3 - Institut für Informationstechnik, Professur: Knopp, Andreas},
    
    
}