Summary

Rakuten Mobile said on February 16, 2026 that its proposal was selected under JAXA's Space Strategy Fund theme focused on frequency sharing for integrated satellite and terrestrial network operations. The program targets technology needed to keep everyday smartphones connected as traffic shifts across space and ground infrastructure.

According to Rakuten's disclosure, the project runs from March 2026 through March 2031 with potential support of up to JPY 10.649 billion, and includes partners from the University of Tokyo. The stated technical scope includes AI-assisted radio optimization, cross-layer handover controls, and operational methods for non-terrestrial and terrestrial coexistence.

This arrives as Japan's direct-to-cell market is accelerating: NTT DOCOMO announced commercial direct-to-cell service on February 9, 2026 with SKY Perfect JSAT and Airbus, and KDDI reported expanded maritime coverage for its au Starlink Direct service in a January 29, 2026 update.

Signals for Investors

  • Japan is moving from pilot narratives to funded multi-year execution, which improves visibility for vendors building NTN modems, RF front ends, network orchestration software, and interoperability test platforms.
  • The five-year subsidy window lowers early platform risk for Rakuten's ecosystem, but commercialization still depends on spectrum coexistence performance under real congestion and mobility conditions.
  • Inference: carriers that can prove stable handover and interference control across satellite and terrestrial layers should gain enterprise and public-sector credibility first, especially in maritime and disaster-resilience use cases.

What to Watch Next

Watch for formal publication of project milestones under the JAXA fund process, evidence of field validation with commercial terminals, and whether Japanese operators converge on interoperable NTN operating profiles. Also track whether the R&D program translates into procurement signals for chipset, antenna, and managed-network suppliers before the 2030 timeframe.