First Voice over Narrowband NTN testbed demo at MWC 2025
To be demonstrated at Mobile World Congress 2025, Murata and Rohde & Schwarz have collaborated to introduce the first testbed for Voice over Narrowband Non-Terrestrial Network (NB-NTN).
The NB-NTN technology will bring voice to remote and bandwidth-constrained areas where terrestrial network access is lacking or when terrestrial networks fail.
Marking a significant leap in 3GPP-based satellite connectivity, the demonstration sets a new standard for satellite-based communications, paving the way for voice capabilities even in the most bandwidth-constrained environments.
The innovative testbed utilizes the CMW500 wideband radio communication tester from Rohde & Schwarz as a GEO/GSO satellite eNB emulator, along with Murata’s Type1SC Cat.M1/NB-IoT/NB-NTN module featuring Sony’s Altair Chip ALT1250. It also employs a VoIP client application developed by Rohde & Schwarz, which uses codecs that operate at ultra-low bitrates. This technology addresses critical communication needs where traditional networks are inadequate. The demonstrator opens the door for push-to-talk-like NB-NTN applications, making it particularly suitable for emergencies, disaster response, remote areas, and maritime operations.
Featuring ultra-low power consumption, the ALT1250 modem significantly extends battery life and reduces maintenance costs. The chip’s advanced power management capabilities enable IoT devices to operate for extended periods, ranging from weeks for smart wearables to over a decade for smart meters. Further, the high level of integration and minimal required external components enable module sizes as small as 100mm²,
With the rapid adoption of NB-NTN chipsets in smartphones, wearables, and automotive systems, this technology significantly enhances ubiquitous connectivity. The demonstration shows the potential of Narrowband NTN services with push-to-talk voice in addition to emergency SOS, and SMS. The push-to-talk-like application will boost safety and communication capabilities in areas without terrestrial network access.
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