Japan's Ministry of Economy, Trade and Industry (METI) has selected Rakuten Symphony to lead the deployment of Open RAN and RAN Intelligent Controller (RIC) technology across seven countries. The decision puts one of Japan's most vocal Open RAN advocates at the centre of a government-backed effort to extend the country's influence over the next generation of mobile network architecture beyond its own borders.

The selection is significant on two levels. First, it hands Rakuten Symphony — the network software and infrastructure arm spun out of Rakuten Mobile's own cloud-native 4G and 5G build — an official endorsement from one of Japan's most powerful economic ministries. Second, it signals that Tokyo views Open RAN not merely as a domestic procurement preference but as an export proposition, with Japanese technology positioned to shape how operators in multiple markets construct their radio access networks.

METI has been among the more active government bodies worldwide in promoting open and interoperable network architectures. Its backing of Open RAN aligns with a broader policy current in Washington, Brussels and Tokyo that seeks to diversify vendor supply chains and reduce dependency on a small circle of incumbent radio equipment makers. By financing and coordinating trials that mix components from multiple suppliers, agencies like METI are trying to convert what has been an engineering debate into deployed, commercial-grade infrastructure.

Rakuten Symphony brings unusual credibility to that task, though it comes with caveats. The company grew out of Rakuten Mobile's decision to build Japan's newest mobile network from scratch on Open RAN principles, using a fully virtualized radio access network and containerized network functions rather than the monolithic baseband systems sold by legacy vendors. That build gave Rakuten Symphony a working, production-scale reference for open interfaces and cloud-native RAN — something few competitors can claim.

The counterweight is commercial. Rakuten Mobile's network, launched in 2020, has struggled to win subscribers at the scale needed to justify its investment, and the Rakuten group has poured billions of dollars into the venture. Symphonium, as the infrastructure business is now positioned, must prove that its model works not only inside its parent's network but for third-party operators with different spectrum portfolios, legacy estates and cost structures.

The seven-country scope of the METI-backed programme addresses exactly that question. Multi-market deployment is the test that Open RAN has repeatedly faced and only partially passed: interoperability across vendors demonstrably works in labs and trials, but operators have been slower to commit at scale in live networks, citing integration costs, performance questions and the operational burden of assembling networks from multiple suppliers.

The inclusion of the RIC in the programme points to where METI and Rakuten Symphony see the near-term value. The RAN Intelligent Controller sits at the heart of the Open RAN architecture's promise: a software layer that can optimize network performance in near-real time, slice capacity for specific use cases, and open the RAN to third-party applications. If the deployments demonstrate measurable gains in efficiency or service quality from RIC-driven optimization, they would strengthen the commercial case for open architectures on grounds more concrete than supply-chain policy.

For Rakuten Symphony, the METI mandate also functions as a signal to operators weighing the company as a supplier. A government selection across seven distinct markets implies coordinated deployment activity, reference cases in multiple regulatory environments and the bureaucratic weight of Japan behind the effort — assets that a challenger vendor competing against Ericsson, Huawei, Nokia and ZTE cannot easily buy.

How the programme unfolds will depend on details that METI's announcement leaves open: which operators in the seven countries will host the deployments, what funding attaches to them, and on what timeline equipment and software will go live. Those specifics will determine whether this becomes a genuine expansion of Rakuten Symphony's international footprint or a series of subsidized showcases. For now, Japan's government has placed its bet: that the architecture Rakuten pioneered in its own struggling network is the one worth exporting.