The European Space Agency (ESA), together with a group of major industry partners, has taken a significant step toward integrating satellite links with terrestrial 5G networks. In a recent demonstration, ESA collaborated with MediaTek, Eutelsat, Airbus Defence and Space, Sharp, the Industrial Technology Research Institute (ITRI), and Rohde & Schwarz to complete the first successful trial of 5G-Advanced Non-Terrestrial Network (NTN) technology using low-Earth orbit (LEO) satellites.
The trial was carried out over Eutelsat’s OneWeb constellation and conformed to the latest 3GPP Release 19 specifications, advancing the technical foundation for networks that combine space-based and ground-based radio access. By using standardised protocols, the partners aim to simplify how satellite connectivity can be incorporated into existing enterprise and carrier networks.
For companies that require continuous connectivity, even brief outages can disrupt operations and cost revenue. While 5G coverage has expanded across urban and suburban areas, many remote, maritime, and offshore locations still lack reliable ground coverage. Integrating LEO satellites with 5G networks can extend reach to those hard-to-cover places, supporting real-time applications in shipping, logistics, energy, public safety, and other industries that depend on persistent links for telemetry, control, and communications.
From experiment to implementation
The trial combined MediaTek’s 5G NTN chipset with ITRI’s base-station equipment, operating in Ku-band frequencies using a 50 MHz channel bandwidth. A key technical milestone demonstrated in the test was conditional handover: a device was able to switch between a LEO satellite and a terrestrial 5G tower without dropping the session, ensuring continuity of service as the user or device moved between coverage domains.
A flat-panel terminal manufactured by Sharp maintained a stable connection through a ground station at ESA’s technology centre in the Netherlands. Airbus supplied the OneWeb satellite platform and transponders, while Rohde & Schwarz provided signal-testing and measurement tools. Together, the partners validated that satellite broadband and terrestrial 5G systems can share common network settings and operate in concert, paving the way for more seamless hybrid connectivity solutions.
This demonstration brings 5G-Advanced NTN technology closer to commercial deployment. Sectors such as defence, maritime transport, energy production, and remote industrial operations stand to be early beneficiaries, using the added reach of satellites combined with terrestrial networks to maintain communications where ground infrastructure is sparse or unavailable.
Opportunities and operational challenges
Broad adoption of satellite-integrated 5G networks will require time and coordinated effort. Merging satellite and terrestrial networks involves more than allocating frequencies; it demands cooperation among mobile operators, equipment manufacturers, satellite operators, and regulators to agree on standards, interoperability, and commercial arrangements. Network operators will also need enhanced orchestration and control software to manage how devices transition between satellite and terrestrial links, including handover policies, resource allocation, and quality-of-service guarantees.
Latency remains an important consideration. Although LEO satellites reduce round-trip delay compared with geostationary systems, signals still travel thousands of kilometres through space and ground segments. For latency-sensitive use cases—such as closed-loop industrial controls, some forms of autonomous operation, or high-frequency financial trading—operators must carefully evaluate which functions are suitable to run over satellite paths versus remaining on local or terrestrial networks.
Cross-border data flows introduce further complexity. When a hybrid satellite-terrestrial session traverses multiple jurisdictions, organisations must ensure compliance with regional data-protection and cybersecurity regulations. That includes managing where data is stored and processed, implementing adequate encryption and access controls, and aligning operational practices with legal obligations in different countries.
Despite these challenges, the trial underscores Europe’s commitment to advancing next-generation communications. ESA’s David Phillips highlighted that collaborative efforts are essential to strengthening the competitiveness and growth of the European satellite communications ecosystem. Representatives from MediaTek, Eutelsat, and Sharp described the result as an important move from laboratory experiments toward operational readiness in real-world networks.
What’s next
ESA’s Space for 5G/6G & Sustainable Connectivity programme is part of a broader initiative to create a unified connectivity fabric that spans land, sea, and air. Research and testbed facilities in the UK and the Netherlands are now being used by telecom operators, hardware vendors, and software developers to validate solutions, refine integration approaches, and trial new services.
The next phase of development will focus on scaling the technology: improving handover mechanisms, enhancing interoperability between different satellite constellations and terrestrial vendors, and evaluating commercial deployment models. This includes stress-testing performance across diverse environments, optimising resource usage, and developing management systems that enable operators to deliver consistent service-level agreements across hybrid networks.
Over time, satellite-backed broadband may become a routine element of enterprise connectivity—comparable to fibre and terrestrial wireless in terms of ease of integration and operational predictability. For technology and network leaders, the practical takeaway is clear: the distinction between terrestrial and space-based connectivity is narrowing. Early planning around interoperability, latency-sensitive architecture, regulatory compliance, and robust cybersecurity will position organisations to benefit from always-on connectivity across regions where terrestrial towers cannot reach.
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