Docomo Completes Virtualization of Its Mobile Network Core

NTT Docomo has completed the process of virtualizing its mobile core network, marking a significant step in modernizing its telecommunications infrastructure and enhancing the efficiency and scalability of its services for customers across Japan.

A Transformative Leap in Japanese Telecom Infrastructure

In a move that redefines the landscape for Japanese telecommunications, NTT Docomo has finalized the full virtualization of its core network. This significant transition encompasses not only the 5G core but also critical components such as the Evolved Packet Core (EPC) and the IP Multimedia Subsystem. After more than two decades of research and incremental progress, the company has now shifted these vital functions onto general-purpose servers—leaving behind dedicated hardware in favor of a far more agile architecture.

Collaboration Powers Ambitious Overhaul

The journey toward complete virtual infrastructure was not undertaken alone. Several global industry heavyweights—including Cisco, Dell Technologies Japan, NEC, and Ericsson Japan—joined forces with NTT Docomo, lending expertise and technology to make this transformation possible. Leaders involved in the project describe it as a “decisive milestone” for Japan’s communications sector, suggesting that such cooperation will serve as a model for future developments both domestically and abroad.

Unprecedented Flexibility and Efficiency Gains

The implications of this shift extend beyond mere modernization. Moving away from proprietary hardware unlocks remarkable flexibility: resources can now be dynamically allocated across multiple systems, adapting swiftly to changing traffic patterns. As a result, several tangible benefits have emerged:

• Operational efficiency has increased noticeably, highlighted by substantial energy savings.
• The physical footprint needed for network equipment has been considerably reduced.
• The introduction of self-healing features has strengthened overall network reliability.

Although most functions now operate virtually, physical routers and switches remain integral—a pragmatic measure to maintain stability within the new hybrid environment.

Paving the Way for Future Innovation

Beyond immediate improvements in robustness, sustainability, and scalability, this strategic overhaul signals a clear ambition: establishing a technological edge for Japan’s telecom ecosystem. The move towards a software-driven architecture is poised to inspire others throughout the industry—both at home and internationally—by demonstrating how virtualized infrastructure can meet ever-growing demands while reducing environmental impact. For now, NTT Docomo’s achievement stands as both a national benchmark and a harbinger of broader changes across global telecommunications.