Architectures and Key Technical Challenges for 5G Systems Incorporating Satellites

Satellite communication systems are a promising solution to extend and complement terrestrial networks in unserved or under-served areas, as reflected by recent commercial and standardization endeavors. In particular, 3GPP recently initiated a study item for new radio, i.e., 5G, non-terrestrial netw...

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Published in:IEEE transactions on vehicular technology Vol. 68; no. 3; pp. 2624 - 2639
Main Authors: Guidotti, Alessandro, Vanelli-Coralli, Alessandro, Conti, Matteo, Andrenacci, Stefano, Chatzinotas, Symeon, Maturo, Nicola, Evans, Barry, Awoseyila, Adegbenga, Ugolini, Alessandro, Foggi, Tommaso, Gaudio, Lorenzo, Alagha, Nader, Cioni, Stefano
Format: Journal Article
Language:English
Published: New York IEEE 01.03.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
3GPP
5G mobile communication
Access control
Architecture
Automatic repeat request
Broadband
Broadband communication
Communication channels
Computer architecture
Delays
Mobile communication systems
Mobile computing
Narrowband
new radio
PHY/MAC procedures
Random access
Satellite broadcasting
Satellite Communications
satellite-terrestrial networks
Standardization
Waveforms
Wireless networks
ISSN:0018-9545, 1939-9359
Online Access:Get full text
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Summary:Satellite communication systems are a promising solution to extend and complement terrestrial networks in unserved or under-served areas, as reflected by recent commercial and standardization endeavors. In particular, 3GPP recently initiated a study item for new radio, i.e., 5G, non-terrestrial networks aimed at deploying satellite systems either as a stand-alone solution or as an integration to terrestrial networks in mobile broadband and machine-type communication scenarios. However, typical satellite channel impairments, as large path losses, delays, and Doppler shifts, pose severe challenges to the realization of a satellite-based NR network. In this paper, based on the architecture options currently being discussed in the standardization fora, we discuss and assess the impact of the satellite channel characteristics on the physical and medium access control layers, both in terms of transmitted waveforms and procedures for enhanced mobile broadband and narrowband-Internet of Things applications. The proposed analysis shows that the main technical challenges are related to the PHY/MAC procedures, in particular random access, timing advance, and hybrid automatic repeat request and depending on the considered service and architecture, different solutions are proposed.
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ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2019.2895263