Mavenir and Terrestar Achieve Milestone with First NB-IoT Call in NTN Mode

Key Takeaways

Mavenir and Terrestar successfully conducted the first Voice over NB-IoT call using Non-Terrestrial Networks.
The demonstration utilized a 3GPP-standardised S-band spectrum, ensuring reliable connectivity even in remote areas.
This collaboration enables immediate voice service launch for GEO satellite operators, enhancing coverage for IoT applications and critical communication services.

Successful VoNB Call Achieved by Mavenir and Terrestar

Mavenir, in collaboration with mobile satellite operator Terrestar, has successfully completed the first Voice over NB-IoT (Narrowband Internet of Things) call in a Non-Terrestrial Network (NTN) mode, marking a significant achievement in enhancing global connectivity. This milestone was achieved in January 2025 and utilized a 3GPP-standardised NTN S-band spectrum to minimize interference commonly found in terrestrial networks.

The system was architected to handle the delays associated with geostationary Earth orbit (GEO) satellites, ensuring that users can enjoy seamless and reliable communication despite inherent higher latency. This innovative approach allows GEO satellite operators the opportunity to monetize NTN services immediately, without the need for extensive infrastructure upgrades.

The Voice over NB-IoT (VoNB) call was executed using various advanced technologies, including Sony’s Altair ALT1250 IoT module, Mavenir’s Open RAN framework (which comprises Open vRAN and Open Beam radio), and Mavenir’s Converged Packet Core platform. Terrestar contributed the S-band spectrum and operational expertise crucial for the successful execution of the demonstration.

Bridging Connectivity Gaps

This collaboration signifies a shared mission to address the connectivity gaps in remote and underserved areas. Mavenir and Terrestar leverage the 3GPP standards for NTNs to facilitate IoT solutions and reliable voice communications, enabling connectivity in regions where traditional cellular infrastructure is insufficient.

Jacques Leduc, President of Terrestar Solutions, emphasized the company’s role as a pioneer in offering real-time voice service based on a fully compliant 3GPP non-terrestrial network. With their unique S-band spectrum and open architecture, Terrestar aims to accelerate the ecosystem development, enhancing security and autonomy for users through mobile service providers.

The partnership combines satellite coverage with terrestrial capabilities, significantly expanding reach in geographically isolated locations where establishing traditional infrastructure is impractical or too costly. The streamlined implementation allows for minimal adjustments in existing user devices through simple software upgrades.

Sachin Karkala, Senior Vice President and General Manager of the RAN Business Unit at Mavenir, commented on the vital role that satellite services can play in complementing existing terrestrial networks, particularly in underserved regions. This advancement allows satellite operators to quickly begin providing voice services with existing infrastructure and equipment.

Future of NB-IoT Solutions

The successful VoNB call establishes a strong foundation for the deployment of NB-IoT solutions in NTN mode. This capability is crucial for supporting a diverse array of IoT applications across sectors like agriculture, logistics, energy, and disaster recovery. The incorporation of voice capabilities alongside data-driven services expands the potential use cases for operators and businesses.

Beyond commercial benefits, the partnership has the potential to make significant societal impacts by enhancing connectivity in remote regions, providing communities with essential communication services vital in emergencies.

Overall, this achievement builds upon Mavenir’s role in integrating networks and advancing global standards. The collaboration with Terrestar serves as a powerful example of how innovative partnerships can effectively address real-world challenges, moving closer to the goal of ubiquitous connectivity through NTN technologies. The successful VoNB call not only showcases technical advancements but also underscores the commitment to bridging the digital divide.

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