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By the SpaceNexus Desk
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AST SpaceMobile and Rakuten have formed a new joint venture to provide direct-to-device (D2D) services in Japan, according to Via Satellite. The announcement came as the Japanese government selected a Rakuten proposal for the J-LEO project. The coverage available to us does not detail the ownership split, the number of satellites, spectrum arrangements, service start date or the government funding attached to J-LEO. Those items should be treated as unconfirmed, and this analysis does not assume them.
The pairing is natural. Rakuten Mobile is a Japanese mobile network operator, and AST SpaceMobile builds large phased-array satellites that connect directly to ordinary phones. Rakuten has been publicly associated with AST as a partner and has promoted satellite-to-phone coverage in Japan's mountainous and remote areas. The joint-venture structure formalizes a commercial route for AST's technology into a national program that the government has now effectively endorsed through its selection.
This development is distinct from AST's other recent news, such as its Blacklift reusable rocket plans, which have already been covered. The new element is regulatory and market access: a government-selected program, a local operator, and a dedicated venture.
D2D providers have mostly proceeded through partnerships with mobile network operators and spectrum arrangements that vary by country. A national government choosing a proposal for a named project adds a layer of official sponsorship. It can ease regulatory questions and signal to domestic stakeholders that the service has policy support. The details of what J-LEO obliges or funds are not in the available summary, so the strength of that support remains to be seen.
Japan has high smartphone penetration, dense urban coverage and mountainous terrain, islands and disaster-prone regions where terrestrial networks can fail. Satellite connectivity to ordinary phones has an obvious resilience use case for emergencies. A joint venture aimed specifically at the Japanese market suggests the partners see value in a localized operating entity rather than simply a wholesale relationship.
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Other recent developments show the field widening. Starlink's mobile effort has selected Qualcomm as a base station supplier and is in a spectrum argument with Deutsche Telekom (76 MHz versus 400 MHz), and both topics have been covered separately. Against that, AST's Japan structure shows a different route: pairing with a domestic operator and aligning with a government-selected program. The comparison illustrates that D2D is no longer only a technology contest. It is also a question of who holds spectrum, who has the local license, and which government endorses which architecture.
For AST SpaceMobile, a Japan venture adds a major market to its portfolio of mobile operator partners. The company's business depends on putting large satellites in orbit at a sufficient pace to provide continuous coverage, and that raises the importance of launch access. Its separate decision to pursue its own reusable rocket, covered earlier, reflects that dependency. Competitors will watch whether a government-backed Japanese program leads Tokyo to favor any particular architecture, and whether further J-LEO selections or partnerships follow.
Rakuten's position illustrates how a terrestrial operator can use satellite service as both a coverage and differentiation tool. Rival Japanese carriers and operators elsewhere will compare the arrangement against their own satellite partnerships. Operators have to decide whether to make exclusive arrangements, which can secure coverage but narrow options, or to remain flexible across providers.
D2D service uses mobile spectrum, and regulators are still developing rules for satellite use of terrestrial bands and for protection against interference. Japan's selection of a specific proposal suggests the government is willing to make decisions on structure and partner choice. International regulators will see Japan's model as a reference point. In the United States, the FCC has been moving toward faster satellite licensing, and spectrum arrangements involving large satellite operators remain contested.
AST's phased-array satellites require large antennas, high-volume manufacturing and reliable launch. The supply chain for antennas and phased-array payloads is expanding across the industry, as seen in SWISSto12's completion of a Critical Design Review for active phased array antennas for UNIVITY's 5G non-terrestrial network. That parallel project shows that the non-terrestrial network field is drawing component investment from multiple companies, and a Japan venture may add demand for similar components.
The recent Starlink disruptions for Ukrainian forces, covered separately, sharpened debates about dependence on a single foreign provider. A Japanese government-selected project with a domestic operator addresses part of the sovereignty concern, since a local joint venture gives Tokyo a point of control. At the same time, the satellites remain built by a U.S. company, so full independence is not the case, a tension echoed in the New Space Economy discussion of whether nations can achieve space sovereignty without building everything themselves.
The main uncertainties are technical and regulatory. D2D service to unmodified phones is hard, and performance depends on satellite scale and spectrum. Government selection does not guarantee commercial success, and the available summary does not specify what the program commits to. Readers should look for primary-source details before drawing conclusions about timing or scale.
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