Docomo Completes Mobile Core Virtualisation

Why It Matters

The shift to a fully software‑defined core cuts operating costs and boosts network resilience, giving Docomo a competitive edge and setting a benchmark for Japan’s telecom industry.

Key Takeaways

• Docomo virtualized 5G, EPC, IMS on commodity servers.
• Cisco, Dell, NEC, Ericsson supplied virtualization expertise.
• Self‑healing reduces downtime, boosts reliability.
• Power use and rack space cut significantly.
• Dynamic scaling enables on‑demand capacity.

Pulse Analysis

NTT Docomo’s announcement that its entire mobile core – including the 5G standalone core, the evolved packet core (EPC) and the IP Multimedia Subsystem (IMS) – now runs as software on general‑purpose servers marks a watershed moment for network function virtualization (NFV) in Japan. The project, the culmination of more than two decades of in‑house research and multi‑vendor trials, leveraged the expertise of Cisco, Dell Technologies Japan, NEC and Ericsson’s local unit to replace traditional, chassis‑based hardware with commodity compute. By keeping the existing transport layer of routers and switches unchanged, Docomo achieved a clean separation between the data plane and the newly virtualised control plane.

The virtualised core introduces self‑healing capabilities that can detect and remediate faults without human intervention, translating into higher network availability for consumers and enterprise customers. Power consumption drops dramatically because dense, purpose‑built appliances are replaced by energy‑efficient servers, while the physical footprint shrinks, freeing valuable rack space in data centres. Perhaps most compelling is the ability to pool resources across multiple network functions, allowing capacity to be allocated automatically in response to traffic spikes. This elasticity reduces capital expenditure and operational overhead, delivering a more cost‑effective path to scale 5G services.

Docomo’s success sends a strong signal to the broader Japanese communications sector, positioning the country at the forefront of cloud‑native mobile infrastructure. Vendors that participated in the rollout gain credibility and are likely to see increased demand for similar NFV solutions across Asia‑Pacific operators seeking to modernise legacy cores. For investors and analysts, the move underscores a shift toward software‑centric business models that can accelerate new‑service rollout, improve margins, and create new revenue streams such as network‑as‑a‑service. As other carriers emulate this approach, the industry could witness faster adoption of automated, scalable networks worldwide.