With greater than 8,000 Starlink satellites in the sky right now, low Earth orbit might look like the place to be to attach the subsequent era of Internet and cellphone prospects. Nonetheless, some gamers are inserting their bets barely nearer to the bottom.
Beginning subsequent yr, Tokyo’s SoftBank Corp. can be beaming a prototype 4G and 5G phone and broadband service from the stratosphere to Japanese finish customers. Floating 20 kilometers above the Earth, the corporate’s airship-based mast can be utilizing energy-regeneration tech and newly allotted spectrum. And the tech might in the end pose an actual, aggressive risk to satellite-based platforms like Starlink.
The Japanese telecom large introduced last month it had secured unique rights to deploy stratospheric, lighter-than-air craft over Japan. SoftBank’s precommercial airship “tower” delivering 4G and 5G cellphone service, the corporate stated, can be coming in 2026. The solar-powered airship, developed by the Moriarty, N.M.–primarily based Sceye, has already accomplished greater than 20 profitable check flights. In the identical press announcement, SoftBank additionally described its plans to additionally use heavier-than-air, fixed-wing uncrewed aerial vehicles that the Japanese firm has developed.
A Technical Blueprint for the Stratosphere
In contrast to the SoftBank system’s fixed-wing sign repeaters, Sceye’s airship can be an autonomously piloted cell tower working under outer house however nonetheless above the climate. The airship will carry the identical sort of base station utilized in terrestrial cell towers (known as 4G eNodeB/5G gNodeB), which can adjust to international broadband requirements, as overseen by the Third Generation Partnership Project, or 3GPP.
“The cell phone doesn’t know the distinction between our platform and a tower,” says Mikkel Vestergaard Frandsen, Sceye’s CEO. “We simply plug into present infrastructure and function beneath the identical 3GPP protocol.”
Sceye’s airship makes use of superior antenna programs that allow precision steering of the sign. Also called beamforming, this 5G tech helps a community cowl vast areas or, conversely, focus bandwidth all the way down to a tighter cone, relying on demand. The corporate studies that its system’s latency is under 20 milliseconds. That may put it forward of Starlink, which delivers right now a community latency of 45 ms, in accordance with a latest survey.
“This isn’t a relay system. We’re the bottom station, ready to answer community demand from the stratosphere,” says Frandsen.
With a payload capability of 250 kilograms and 10 kilowatts of onboard solar power capability, the airship can energy its telecom suite but in addition station-keep—one thing that neither balloons (which drift with the wind) nor fixed-wing UAVs (constrained by restricted payload and energy) can obtain.
Which is why Sceye’s advances in supplies have been essential for high-altitude endurance flights. Based on the corporate, the material comprising the airship’s hull is 5 occasions as robust per unit mass as standard high-altitude platform system (HAPS) supplies. Sceye’s materials can be 1,500 occasions extra gas-tight, in addition to being extra proof against each UV and ozone injury.
“There’s plenty of overlap between excessive sports activities just like the America’s Cup or Method One and our work on HAPS,” stated Frandsen, who recruited engineers from each sectors. “It’s all about pushing supplies to the restrict, safely.”
However even utilizing such a supermaterial for the airship’s pores and skin, staying aloft at an altitude of 20 kilometers calls for additional improvements towards larger effectivity. “On this sort of machine, about 30 p.c of the load goes to the construction, and one other 30 p.c to the power system,” says Vincenzo Rosario Baraniello, Head of the Earth Observation Programs Unit on the Italian Aerospace Analysis Centre (CIRA). “Enhancing these applied sciences provides a aggressive benefit”.
Sceye’s silvery dirigibles are constructed for endurance, able to pointing into the wind, and remaining of their space of operation for months at a time. Ultralightweight and versatile solar skins and high-density battery packs maintain the tools operating in a single day. Whereas the system’s temperature- and UV-shielded payload compartment can face up to excessive stratospheric circumstances. The airship can attain altitude in lower than half-hour, with a single craft in a position to replace up to 25 ground towers.
Constructing on New Spectrum
The time has come, says Nikolai Vassiliev, chief of the Terrestrial Companies Division on the International Telecommunication Union, for stratospheric programs like Sceye’s and SoftBank’s prototype community.
“We have now established energy limits, coordination guidelines, and allotted harmonized bands,” Vassiliev says. “Now it’s as much as operators to deploy.”
Till just lately, high-altitude platforms like Sceye’s and SoftBank’s helium-filled airship relied primarily on millimeter-wave spectrum, together with bandwidth between 47- and 48-gigahertz frequencies. Millimeter waves, although, have restricted vary and are notoriously vulnerable to rain and other inclement weather. Which is why, partly, the World Radiocommunication Conference in 2023 opened up numerous microwave bands between 700 megahertz and 2.6 GHz for HAPS.
These lower-frequency bands successfully opened the best way for direct-to-device connections from stratospheric airships and different high-altitude platforms. “The supply of harmonized, low-band spectrum for direct-to-device HAPS has essentially modified the enterprise case,” stated Toshiharu Sumiyoshi of SoftBank’s Ubiquitous Community Planning Division. “We are able to now ship service with commercially accessible handsets.”
In contrast to earlier high-altitude platforms that acted like signal relays, Sceye’s high-altitude towers will in the end permit customers to cross protection zones with out shedding service, because of handovers between floor and aerial nodes. And that might feel and look to the top person very like on a regular basis terrestrial 4G and 5G protection.
SoftBank remains to be weighing how greatest to deploy Sceye’s stratospheric platforms, whether or not as always-on infrastructure or as on-demand responders throughout emergencies and different durations of anticipated excessive demand. “Our present plan goals for one plane to remain within the air for one yr,” says Sumiyoshi. “However each situations, steady flight or launch in response to a catastrophe, are conceivable. And operational particulars can be finalized after precommercial testing in 2026, taking cost-effectiveness and multiuse choices like remote sensing under consideration.”
Baraniello says no matter type the deployment in the end takes, it marks an essential step ahead. “The partnership between Sceye and SoftBank is important,” he says. “It reveals that these platforms have reached a degree of technological maturity that enables them to be deployed operationally. From an aerospace-engineering standpoint, that’s a giant deal, and the market’s curiosity will additional push analysis, trade, and improvement ahead.”
UPDATE 1 Aug. 2025: The story was up to date to make clear the ITU’s place on the harmonized bands it’s allotted (the ITU’s addition in daring) and to notice that SoftBank and Sceye’s airships are helium-filled.
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