SoftBank beams 5G to phones from the sky in successful stratospheric test flight

SoftBank successfully delivered end-to-end 5G connectivity to standard smartphones using an airborne base station, in a live field trial conducted in June, above Hachijō Island, Japan. The company used a light aircraft flying at 3,000 meters to simulate a high-altitude platform, linking ground infrastructure to devices via a 26 GHz feeder connection and a 1.7 GHz service link.

Unlike most “direct-to-device” projects that rely on satellites in low Earth orbit, SoftBank’s approach uses…