SoftBank HAPS mobile broadband trial achieves 68ms edge processing latency

This trial validates a three-layer network architecture where high-altitude platforms bridge the gap between terrestrial towers and orbital satellites. By hosting both a mobile core and web servers 16.5 km in the air, operators can deliver low-latency video and compute resources to remote areas without the propagation delays inherent in satellite links. For the streaming ecosystem, this suggests a future where high-bandwidth delivery is decoupled from ground-based fiber availability, particularly for drone-based production and disaster recovery. Watch for SoftBank to move toward commercialization as they integrate Sceye’s stratospheric endurance with their existing mobile infrastructure.

Sceye has been building toward operational HAPS service for several years, positioning its stratospheric aircraft as a complement to both terrestrial and satellite networks. In early 2025, Sceye secured a $100 million investment from SoftBank to accelerate HAPS development and commercialization, signaling the Japanese operator's intent to move beyond experimental trials into production-grade non-terrestrial connectivity. The company's SceyeCELL platform, a solar-powered high-altitude aircraft designed for persistent station-keeping at approximately 65,000 feet, represents a different approach from SoftBank's earlier HAPS partnership with AeroVironment's Helios platform, which was discontinued after a 2003 crash. SoftBank has since consolidated its HAPS strategy around Sceye's airframe, which uses a helium-filled envelope for buoyancy combined with fixed wings for propulsion, enabling multi-month endurance without refueling.

On the regulatory and business side, Japan's Ministry of Internal Affairs and Communications has been actively allocating spectrum for HAPS operations. In 2024, Japan's MIC designated the 2 GHz band for HAPS mobile broadband use, clearing a path for SoftBank to integrate stratospheric base stations into its existing licensed spectrum holdings. SoftBank has also pursued international expansion of its HAPS ambitions, with the operator announcing plans to deploy HAPS connectivity across Southeast Asia and Africa through partnerships with local carriers. The commercial model SoftBank envisions treats HAPS as a capacity layer for rural and disaster-affected areas where terrestrial infrastructure is economically unviable or physically destroyed, a use case that gained urgency after the 2024 Noto Peninsula earthquake disrupted conventional networks.

From a technical standpoint, the 68ms edge-processing latency demonstrated in the Service Test 1 trial compares favorably with satellite-based alternatives. Sports streaming latency drives 14% of viewers to consider switching providers, and while SpaceX's Starlink direct-to-cell service, which SoftBank has also explored for coverage gaps, typically introduces round-trip latencies of 30 to 50 milliseconds for low-Earth-orbit satellite links, that figure excludes ground-station backhaul and core-network processing. By hosting the mobile core and web servers directly on the HAPS platform, SoftBank and Sceye eliminate the ground-segment hop entirely, reducing total user-plane latency for local content delivery. Sceye's Marc Kavinsky has stated that the company targets commercial HAPS service by 2027, with initial deployments focused on Japan's rural prefectures and disaster-response scenarios where rapid network restoration is critical.