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OpenAirInterface™ Extension for 5G Satellite Links
Funded by: European Space Agency (ESA)
Summary on ESA webpage: https://connectivity.esa.int/projects/5gleo
The work during this project has been made open-source and can be downloaded from here: https://gitlab.eurecom.fr/oai/openairinterface5g/-/tree/leo-5g-ntn/
Project Objectives
Extend the Openairinterface5G (OAI) software stack to support satellite systems in non-geostationary orbits.
Implement a full 5G protocol stack (Release ≥16) for the UE and the gNB.
The outcome of this activity will be a publicly available new version of the open-source OAI software library with new features to simulate and test 5G LEO satellite communication links.
The 5G-LEO project will speed up the development of OAI as a simulation tool for 5G-NTN R&D activities.
My role:
Extension of timers and buffers for the higher layer (RLC and PDCP) and location-dependent (satellite position) optimization. Because compared to 5G GOA, a major challenge in 5G LEO is the time-varying Round Trip Delay. Thus simply extending the timers and buffers at the RLC and PDCP layer was not sufficient.
Enabling RLC Acknowledgement Mode (RLC-AM) for early retransmission. This was done because HARQ feedback is disabled, hence, RLC in its AM mode of operation can provide early recovery of lost packets instead of delegating all the retransmission to higher layers.
End-to-end testbed set-up at UniLu ( gNB, UE, satellite channel emulator), in-lab validations over satellite channel emulator
Published 5 conference papers FNWF, Softcom, ICSSC, Globecom
Testbed set-up for 5G LEO at University of Luxembourg
Related Publications: To be Updated
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