Non-Terrestrial Networks (NTN) Tutorial: Architecture, Spectrum, and Technical Foundations
by Paresh Panchal, Principal Engineer – Charter Communications
Abstract:
Several Non-Terrestrial Network (NTN) related articles have appeared on the IEEE ComSoc Techblog over the past year. They include: Alan J Weissberger’s market overview (December 2025), the Keysight/Samsung frequency band n252 demonstration (January 2026), the Telecoms.com survey summary (July 2025), and the enterprise IoT hybrid-network article (January 2026). These contributions provide useful market context and early deployment perspective, but they do not fully address the engineering considerations that determine how an NTN system is actually designed, dimensioned, and deployed.
Importantly, they do not examine the 3GPP Release 18 NTN architecture options (A1–A4), which define key implementation choices for operator and satellite network integration. They also do not analyze NTN band planning and its regulatory variability across CEPT and FCC jurisdictions, or the propagation-delay effects that must be accounted for in HARQ timing, scheduling, and other RAN procedures. These issues are central to practical deployment planning and to the selection of an appropriate NTN architecture for a given use case.
This article fills that gap by providing a practitioner-oriented technical reference that complements the existing market-level coverage with engineering detail, e.g. NTN deployment options, spectrum applicability, and protocol-level implications. It is intended to serve as a practical guide for engineers and network planners assessing NTN architecture, spectrum strategy, and protocol behavior in real deployment scenarios.
Read my article at https://wireless-vector.com/ntn-article
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About the Author:
Paresh is a wireless communications professional with deep expertise in RAN systems and architecture, network design, performance engineering, and network analytics. He’s been an active contributor to radio access network innovation with deep expertise in 5G/4G/CBRS RF design and optimization, specializing in cloud-native and O-RAN environments. Proven track record across multi-vendor, multi-country engagements covering greenfield and commercial networks. Core competencies span RF network modeling, performance analytics, and cross-functional program execution. Inventor with 25+ patent applications in radio network technologies.
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References:
Non-Terrestrial Networks (NTNs): market, specifications & standards in 3GPP and ITU-R
Keysight Technologies Demonstrates 3GPP Rel-19 NR-NTN Connectivity in Band n252 (using Samsung modem chip set)
Telecoms.com’s survey: 5G NTNs to highlight service reliability and network redundancy
ITU-R recommendation IMT-2020-SAT.SPECS from ITU-R WP 5B to be based on 3GPP 5G NR-NTN and IoT-NTN (from Release 17 & 18)
China ITU filing to put ~200K satellites in low earth orbit while FCC authorizes 7.5K additional Starlink LEO satellites
Samsung announces 5G NTN modem technology for Exynos chip set; Omnispace and Ligado Networks MoU
