By Manuel Nau, Lead Editor at IoT Business News.
SoftBank and Sceye have signed a five-year agreement to deploy a fleet of stratospheric aircraft equipped with telecommunications systems, with the goal of delivering mobile broadband coverage across Japan directly to standard mobile devices.
Extending wireless coverage beyond the reach of terrestrial networks usually means relying on satellites or building additional ground infrastructure. But a third approach emerged: placing telecommunications equipment in the stratosphere, high enough to cover large geographic areas while remaining closer to connected devices than satellites.
Japan could be an important test for this architecture. SoftBank Corp. and US-based aerospace company Sceye have signed a five-year Master Services Agreement covering the manufacturing, launch and operation of a fleet of High Altitude Platform Systems (HAPS), with the aim of providing national coverage.
The agreement marks the transition from experimental flights to preparations for commercial deployment. It follows SoftBank’s investment in Sceye in 2025 and a series of connectivity demonstrations that took place earlier this year.
Building a Third Layer Wireless Infrastructure
Unlike conventional cell towers, HAPS operate in the stratosphere, providing wireless coverage over large areas from a relatively stable aerial position. They are intended to complement rather than replace existing terrestrial and satellite networks.
Under the agreement, most of Sceye’s initial fleet will deliver mobile broadband services in Japan. Several smaller platforms will support Free Space Optical (FSO) networks, using optical communications to develop connectivity links in the stratosphere.
This dual approach is particularly important. Instead of treating HAPS as just an air base station, SoftBank and Sceye are developing an architecture where the stratospheric platform can serve as a wireless access infrastructure and as an element of a broader communications network.
The initiative is part of SoftBank’s Ubiquitous Network strategy, which aims to integrate terrestrial infrastructure, aerial platforms and satellites into a three-dimensional communication architecture.
From Direct to Device Demonstration to Network Deployment
The agreement builds on Sceye’s Service Test 1 mission, which was launched from New Mexico on August 9, 2026. During the 30-day mission, the stratospheric platform went to Japan and returned to the United States, spending about a week conducting operations in Japan.
The aircraft carried SceyeCell, a stratospheric telecommunications system designed to provide mobile broadband directly to standard devices without the need for a dedicated satellite terminal.
Working with SoftBank, Sceye demonstrated text messaging, voice calling, internet connectivity and video streaming. The tests also include indoor communications, emergency connectivity, remote drone control and edge computing implemented on the platform.
The demonstration is important because it attempts to integrate with existing mobile network infrastructure rather than relying on proprietary communication devices. For network operators, compatibility with conventional mobile equipment can simplify the introduction of aerial coverage as an extension of existing services.
The mission also includes laser ranging tests involving stratospheric platform-based tracking, supporting the development of future optical communication links between terrestrial, air and space infrastructure.
What Stratospheric Networking means for IoT
For the IoT industry, the relevance of HAPS extends beyond improved mobile broadband coverage. Aerial network infrastructure can provide additional connectivity options for distributed devices operating in rural, mountainous areas or locations where terrestrial network expansion is difficult.
Potential applications include remote infrastructure monitoring, environmental sensing, industrial asset tracking and connected systems that require communication continuity during natural disasters.
However, the distinction between demonstrated capabilities and future IoT services remains significant. The company has validated some mobile connectivity functions, but the announcement does not establish the compatibility of certain IoT devices, support for low-power mobile technologies or characteristics of commercial services.
For IoT solution providers and device manufacturers, practical adoption will depend on factors including network availability, supported radio technology, power consumption, service pricing and integration with existing connectivity management systems.
The onboard edge computing demonstrated during the Japanese test introduces another possibility: processing selected data closer to the connected device than routing each operation through a distant cloud infrastructure. Its practical value will depend on the applications it supports and its eventual network architecture.
Challenges Now Moving to Commercial Scale Operations
While the five-year agreement is a substantial commitment, neither company has disclosed the number of platforms it plans, deployment milestones or the financial value of the contract. National coverage remains an objective rather than an operational achievement.
Scaling from individual flight demonstrations to continuously available networks also requires coordinated platform operations, reliable connectivity integration and service continuity across the entire fleet.
For SoftBank, the project offers a potential route to strengthen network resilience while developing infrastructure for future 6G era services. For the wider telecom and IoT ecosystem, what matters is whether the stratospheric platform can evolve from a dedicated demonstration to a practical, managed component of a commercial connectivity network.
Thus, the next milestone will be measured less by individual flight achievements than by the ability to provide commercially viable coverage alongside existing terrestrial and satellite infrastructure.