WOS (Session 1) – 5G and satellite communications

Wednesday, 8 June 2022, 16:00-17:30, Room C240

Session Chair: tbd

A 5G-NR Satellite Extension for the QuaDRiGa Channel Model

Stephan Jaeckel (Stephan Jaeckel Consulting, Germany); Leszek Raschkowski and Lars Thiele (Fraunhofer Heinrich Hertz Institute, Germany)
Low Earth orbit (LEO) satellite networks will become an integral part of the global telecommunication infrastructure. Modeling the radio-links of these networks and their interaction with existing terrestrial systems is crucial for the design, planning and scaling of these networks. The 3rd generation partnership project (3GPP) addressed this by providing guideline for such a radio-channel model. However, the proposed model lacks a satellite orbit model and has some inconsistencies in the provided parameters. This is addressed in this paper. We provide a non-geostationary-satellite model that can be integrated into geometry-based stochastic channel models (GSCMs) such as QuaDRiGa. We then use this model to obtain the GSCM parameters from a simplified environment model and compare the results to the 3GPP parameter-set. This solves the inconsistencies, but our simplified approach does not consider many propagation effects. Future work must therefore rely on measurements or accurate Ray-tracing models to obtain the parameters.

5G-ALLSTAR: Beyond 5G Satellite-Terrestrial Multi-Connectivity

Nicolas Cassiau (CEA-Leti Minatec Campus, France); Ilgyu Kim (ETRI of KOREA, Korea (South)); Emilio Calvanese Strinati (CEA-LETI, France); Gosan Noh (Electronics and Telecommunications Research Institute, Korea (South)); Antonio Pietrabissa (Università di Roma La Sapienza, Italy); Fabrice Arnal (Thales Alenia Space, France); Guido Casati (Fraunhofer Institute for Integrated Circuits, Germany); Taesang Choi (Electronic and Telecommunications Research Institute, Korea (South)); You Jun Choi (Korea Automotive Institute Technology & Vehicle IT Fusion Research Center, Korea (South)); Hee Sang Chung (ETRI, Korea (South)); Sylvain Colombero and Pierre Dal Zotto (Grenoble Ecole de Management, France); Emanuele De Santis (University of Rome “La Sapienza”, Italy); Jean-Baptiste Doré (CEA-LETI, France); Alessandro Giuseppi (University of Rome Sapienza, Italy); Jean-Michel Houssin (Thales Alenia Space, France); Junhyeong Kim (ETRI, Korea (South)); Marc Laugeois (CEA-LETI, France); Federico Pigni (Grenoble Ecole de Management, France); Xavier Popon (CEA-LETI, France); Leszek Raschkowski (Fraunhofer Heinrich Hertz Institute, Germany); Marjorie Thary (Thales Alenia Space, France); Seok Ho Won (ETRI, Korea (South))
This paper presents a summary of the results of the 5G-ALLSTAR project. It describes the enablers that have been developed and validated and will help make 5G and beyond satellite-terrestrial multi-connectivity (MC) a reality in the near future.
We proposed and evaluated solutions for critical aspects of the integration of non-terrestrial networks into a 5G and beyond terrestrial network.
The OpenAirInterface implementation of the 5G physical layer (PHY) has been upgraded to meet the satellite radio channel constraints.
We addressed the issue of co-tier interference between satellite and terrestrial systems. We designed and implemented customized 5G Physical layer, specifically adapted for terrestrial-satellite spectrum sharing. On top of the dedicated beam-forming and hardware design, we validated the full potential of MC by conceiving and testing our proposed resource allocation algorithms based on a custom multipath TCP protocol.
The contribution of MC in vehicular use cases has been demonstrated onsite by implementing a terrestrial 5G PHY in conjunction with a satellite/terrestrial traffic controller. Finally, radio resource management solutions were examined. Thanks to these tools, the presence of industry partners in the consortium and to an active participation in standardization, the 5G-ALLSTAR project is an accelerator for the integration of non-terrestrial networks in 5G and beyond.

Location-Assisted Precoding in 5G LEO Systems: Architectures and Performances

Alessandro Guidotti (University of Bologna, Italy); Carla Amatetti (Alma Mater Studiorum University of Bologna, Italy); Fabrice Arnal and Baptiste Chamaillard (Thales Alenia Space, France); Alessandro Vanelli-Coralli (University of Bologna, Italy)
Satellite communication systems are a fundamental component in support of Europe’s ambition to deploy smart and sustainable networks and services for the success of its digital economy. To cope with the 5G and beyond ever increasing demand for larger throughput, aggressive frequency reuse schemes (i.e., full frequency reuse), with the implementation of precoding/beamforming to cope with the massive co-channel interference, are recognised as one of the key technologies. While the best performance can be obtained with the knowledge of the Channel State Information (CSI) at the transmitter, this also poses some technical challenges related to signalling and synchronisation. In this paper, we focus on precoding solutions that only needs the knowledge of the users’ positions at the transmitter side, namely the recently introduced Switchable Multi-Beam (MB) and Spatially Sampled MMSE (SS-MMSE) precoding. Compared to the vast majority of the studies in the literature, we take into account both the users’ and the satellite movement in a Low Earth Orbit (LEO) mega-constellation, also proposing two system architectures. The extensive numerical assessment provides a valuable insight on the performance of these two precoding schemes compared to the optimal MMSE solution.

Over-The-Air Tests of a Satellite-Backhauled 5G SA Network with Edge Computing and Local Breakout

Georgios Gardikis and Dimitris Lioprasitis (Space Hellas S.A., Greece); Socrates Costicoglou (Space Hellas SA, Greece); Simon Watts (Avanti Communications, United Kingdom (Great Britain)); Andreas Perentos (Avanti HYLAS 2 Cyprus LTD, Cyprus); Michael Georgiades (Primetel & PLC, Cyprus); Alexander Phinikarides (Primetel PLC, Cyprus); Alejandro Fornés-Leal (Universitat Politècnica de València, Spain); Carlos E Palau (Universitat Politecnica Valencia, Spain)
The use of satellite as backhaul in 5G networks is currently the most mature approach for satellite/5G integration, extending the coverage of 5G to underserved areas, beyond the reach of terrestrial backhaul infrastructures. This paper presents an actual implementation and over-the-air tests of a 5G Stand-Alone (SA) network, where a satellite link is used to interconnect the 5G Core with the RAN. Furthermore, local breakout (LBO) is adopted to enable edge computing at the satellite edge; this is achieved by virtualizing and off-loading the 5GC User Plane Function (UPF) to the edge. The performance of each configuration is evaluated with generic traffic, using the Open5GENESIS experiment automation suite, as well as in the context of an actual use case (5G smart agriculture).

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