Testing and Validation: Driving Reliability in Non-Terrestrial Networks (NTNs)

As global connectivity demands continue to grow, non-terrestrial networks (NTNs) are emerging as a transformative force in telecommunications. By extending coverage to remote and underserved areas, supporting IoT applications, and complementing terrestrial systems, NTNs are reshaping how we connect. These networks include satellite systems operating in low Earth orbit (LEO), medium Earth orbit (MEO), and geostationary orbit (GEO), as well as high-altitude platform stations (HAPS). Their ability to bridge the digital divide and provide redundancy during emergencies highlights their critical role in the future of communication.

Today, NTNs are already providing real-world benefits. Hybrid connectivity solutions, such as T-Mobile's partnership with Starlink, utilise Starlink's LEO satellites to offer LTE backhaul for text messaging services in rural U.S. areas. Siretta's SNYPER-5G device plays a crucial role in detecting these networks, providing insights into signal strength, operator details, and network availability. Its LiveSCAN feature allows for real-time troubleshooting of network inefficiencies, making it an essential tool for optimising hybrid NTN deployments.

The Current State of NTNs NTNs are no longer just a futuristic concept-they are actively solving connectivity challenges today. As previously mentioned, T-Mobile's collaboration with Starlink is enabling text messaging services in areas that were previously unreachable by traditional cell towers. This service is expected to expand to voice and data capabilities by mid-2025, showcasing the practical applications of NTNs in addressing immediate connectivity issues.

Beyond text messaging, NTN supports low-power IoT applications such as agricultural monitoring, disaster response systems, and industrial sensors. These use cases demonstrate the versatility of NTNs and their capacity to address diverse needs across various industries. Meanwhile, companies like SpaceX and OneWeb are deploying additional satellites to enhance coverage density and reduce latency, further solidifying the role of NTNs within the telecommunications ecosystem.

Expanding NTN Deployments: UK and Europe Recent developments in the UK and Europe highlight the rapid evolution and adoption of NTNs: Vodafone UK's Direct-to-Smartphone Satellite Service: Vodafone, in partnership with AST SpaceMobile, has achieved the world's first satellite-enabled video call using a standard 4G/5G smartphone from a remote area in Wales. This demonstration showed that users can make video calls, browse the internet, and use messaging services in areas previously lacking mobile broadband. The service, which requires no specialist hardware, seamlessly switches between terrestrial and satellite networks, with commercial rollout planned in the UK and Europe from late 2025 into 2026. This positions Vodafone as a leader in providing universal digital connectivity and closing rural coverage gaps.

Deutsche Telekom, Skylo, and Qualcomm's SMS-Over-Satellite in Europe: Deutsche Telekom, alongside Skylo and Qualcomm, has completed Europe's first operator-native trial of SMS messaging over GEO satellite using standard smartphones. Conducted on Deutsche Telekom's Cosmote network in Greece, this trial utilised the Qualcomm Snapdragon X80 5G Modem-RF System and 3GPP Release 17 specifications. This approach enables customers in areas without terrestrial coverage to send and receive text messages globally on their regular devices, supporting emergency communications and providing ubiquitous coverage without requiring special apps or hardware.

Challenges Facing NTNs Despite their potential, NTNs face unique challenges due to their operational environments. Latency remains a significant concern for GEO satellites positioned 36,000 km above Earth. The time required for signals to travel between satellites and ground stations introduces delays that necessitate adaptive protocols for seamless communication.

Environmental factors also play a critical role in NTN performance. Rain fade (Rain fade refers to the attenuation of satellite signals caused by heavy rainfall, which can disrupt communications and requires careful testing and mitigation), ionospheric disturbances and solar activity can degrade signals, disrupting communication links. These issues necessitate rigorous testing under simulated conditions to ensure reliability across various scenarios.

Hybrid architectures introduce an additional layer of complexity. Modern NTNs frequently combine satellites with terrestrial systems and HAPS platforms, creating challenges related to seamless interoperability. Ensuring that all components function together effectively is crucial for delivering consistent results.

Near-Term Developments: What's Next for NTNs? The next 12 months will see significant advancements in the NTN landscape. Companies such as SpaceX and OneWeb are continuing to deploy satellites to enhance coverage density and reduce latency. In addition to consumer-focused services, such as rural broadband and emergency communications through satellite-enabled Wireless Emergency Alerts (WEAs), IoT applications will continue to grow. NTNs will support low-power connectivity solutions for remote sensors in agriculture, industrial monitoring systems, and disaster resilience efforts.

Evolving with Standards: Siretta's Role in NTN As non-terrestrial networks (NTN) evolve from concept to deployment, Siretta is ensuring its technology stays in step. The SNYPER platform is designed to adapt with advancing standards, allowing users to keep pace with the latest connectivity developments.

While the current SNYPER-5G model focuses on terrestrial network analysis and does not yet support NTN detection, an IoTS version with this functionality is now released.

The SNYPER-5G already provides robust insight

LINK:	https://www.siretta.com/2025/10/testing-and-validation-driving-reliabi...
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