NTT Docomo has deployed open RAN equipment supplied by Nokia, marking another step in the Japanese operator's long-running effort to run its radio network on multivendor, standards-based architecture.

The deployment, reported by Light Reading, confirms that Nokia's open radio access network portfolio now carries live traffic on Docomo's network, the largest mobile operation in Japan by subscribers.

Docomo holds a distinctive position in the open RAN field. The operator began disaggregating its radio network years before the term became a vendor marketing staple, and it has promoted its own approach to open interfaces through contributions to standards bodies and through partnerships with multiple infrastructure suppliers.

Nokia, for its part, has positioned open RAN compatibility across its radio product line rather than as a separate product family. The Finnish vendor argues that operators should not have to choose between open interfaces and established performance, and it has secured open RAN engagements with operators across Europe, Asia and North America.

What does the deployment change?

For Docomo, adding Nokia equipment to an open RAN environment extends the operator's supplier base beyond the vendors already integrated into its architecture. The practical question for any operator running multivendor radio gear is simple: does the new combination hold up at scale, in live traffic, under real network load?

A live deployment answers that question more convincingly than a lab trial or a memorandum of understanding. Trials are cheap. Carrying commercial traffic is the test that matters, and Docomo has now put Nokia's gear through that test.

For Nokia, the engagement carries weight beyond the Japanese market. Docomo is widely regarded as one of the most technically demanding operators in the world, and its network serves as a reference point for other carriers weighing open RAN procurement. A vendor that performs inside Docomo's architecture gains credibility with operators elsewhere.

The commercial picture

Vendor announcements about open RAN routinely emphasize architecture philosophy over commercial substance. The relevant facts here are narrower and firmer: Docomo has deployed the equipment, and the deployment involves Nokia, an incumbent-scale vendor rather than a startup riding the open RAN wave.

That distinction matters for the open RAN market as a whole. Much of the movement's early momentum came from challengers arguing that open interfaces would let new entrants break the grip of the major radio vendors. Docomo's work with Nokia points in a different direction: open interfaces as a way for large operators to mix established vendors and specialists within one managed architecture, on the operator's terms.

Standards context

Docomo has pushed its open interface specifications into international standards work, and the operator's deployments have historically served as proof points for those contributions. Open RAN standardization efforts, including work within the O-RAN Alliance, draw directly on architecture choices that Docomo pioneered when it first separated its radio units from its baseband infrastructure.

The deployment also lands at a moment when open RAN adoption globally has slowed relative to the forecasts vendors issued several years ago. Operators have grown more selective, favoring deployments that deliver measurable cost or flexibility gains over architecture for its own sake. Live engagements with tier-one carriers such as Docomo remain the strongest evidence available that open RAN can work at commercial scale.

Whether further Docomo sites will move onto the Nokia equipment, and on what timeline, has not been disclosed. The operator has historically expanded open RAN coverage in stages, validating each vendor combination before widening it.