• Univity established a bidirectional 5G satellite link using mmWave, TDD and onboard processing
  • The uniSpark test is a technology demonstration, with commercial constellation deployment still ahead

The Fact

Univity said on 9 September that its uniSpark satellite had established a bidirectional 5G non-terrestrial network connection between a ground terminal and a 5G base station in orbit. The company says it is the first in-orbit demonstration to combine onboard regenerative 5G processing, a millimetre-wave link and Time Division Duplexing, or TDD. The demonstration was conducted from a CNES site under a programme supported by France 2030.

UniSpark was launched in June 2025. During testing, the ground terminal synchronised with the satellite and registered as a 5G terminal on the network, which connects to a standard 5G core. TDD allows the same spectrum to alternate between uplink and downlink transmission rather than using separate frequencies for each direction. Univity plans two further demonstration satellites under its uniShape programme before moving to uniSky, the planned commercial constellation.

The assessment

The test gives Univity evidence that parts of a terrestrial 5G architecture can work over a satellite link. That matters for operators because Univity's model is built around fitting satellite connectivity into existing mobile networks rather than creating a completely separate service. The demonstration shows that a ground terminal can register with an orbiting 5G base station using the company's chosen mmWave and TDD setup.

There is still a large gap between that test and a commercial network. UniSpark proves a specific connection in orbit, but operators will need broader evidence on performance, coverage and how the system behaves as more satellites and users are added. Univity's next uniShape satellites are intended to test more of that end-to-end architecture before the company moves towards industrial deployment.

For BTW readers, uniSpark moves one part of Univity's design from proposal to an in-orbit test, but the commercial test comes later. The next question is whether the same approach can be repeated across a larger satellite system and integrated into operators' networks without requiring a separate operating model for satellite connectivity.

What to watch

Watch the two planned uniShape demonstration satellites and any operator trials that follow. Performance data from a larger end-to-end 5G NTN system, followed by a timetable for the uniSky commercial constellation, would show how quickly the technology is moving beyond a single in-orbit demonstration.