In short: The 5G MoDE project put an Open RAN network into Twickenham Stadium and ran it with real Virgin Media O2 customer traffic during Six Nations rugby. Open RAN handled the peak demand, and the multi-vendor model held up under the most punishing density scenario UK mobile networks face.
Key Takeaways
- Real traffic, real pressure — this was not a lab trial; VMO2 customers at Twickenham were served by the Open RAN network during live Six Nations matches
- Multi-vendor interoperability proved at scale — Mavenir RAN software, VMware platform, and University of Surrey RIC worked together under genuine peak demand
- Stadium density is the hardest test — 82,000 people in a confined space represents the ceiling of what any mobile network faces, and Open RAN passed it
In a nutshell
Why Stadiums Are the Ultimate Stress Test
Mobile networks are engineered for averages. Drop 82,000 spectators into Twickenham on a Six Nations Saturday and you have an entire city's worth of phones hammering the same antennas simultaneously. Demand spikes sharply at half-time and full-time. If your network architecture has a weakness, this is where it shows.
The 5G MoDE Project
5G MoDE — Mobile Open-architecture Demonstrator for Evolution — was a DSIT-funded project through the Open Networks Ecosystem Competition, bringing together Virgin Media O2, Mavenir, VMware (now Broadcom), and the University of Surrey's 5G/6G Innovation Centre. The question was straightforward: can an Open RAN network, built from multiple vendors' components, match a traditional single-vendor system under real-world peak demand?
Mavenir provided the software-defined RAN. VMware supplied the cloud-native platform. The University of Surrey contributed the RAN Intelligent Controller (RIC) — the AI-driven brain that optimises the network in real time. These were components selected on merit from different organisations, connected through open O-RAN Alliance interfaces, rather than a monolithic stack from a single supplier.
What Happened on Match Day
The Open RAN system was integrated into VMO2's live commercial network. Real VMO2 customers — tens of thousands of them — were served by the Open RAN infrastructure during actual Six Nations matches. No test devices. No synthetic traffic.
The network handled the pre-match surge, half-time spike, and post-match exodus. The RIC dynamically allocated resources in response to shifting demand. The results validated the core proposition: an open, multi-vendor RAN can deliver what a commercial operator needs in the most demanding scenario available. Interestingly, the integration complexity that critics have long pointed to as Open RAN's weakness did not surface as a reliability issue under pressure — though we should note that this was a managed trial environment with dedicated engineering support, which is a somewhat different proposition to business-as-usual operations across thousands of sites.
Why This Matters for the UK
The UK government has identified vendor diversification as a national priority, driven by the costly removal of Huawei equipment and the desire to avoid future dependence on a small number of suppliers. But policy ambition and engineering reality are different things. Open RAN has faced persistent scepticism about integration complexity and performance gaps.
Twickenham directly addresses the performance question. This was the hardest test available, and it passed.
For those of us who have worked on UK Open RAN projects — Aerix was involved in the ONE WORD and Best of British programmes through the same Future RAN Competition that funded much of this work — the result moves the conversation from "can Open RAN work?" to "where do we deploy it next?"
From Stadium to Everywhere
What 5G MoDE demonstrated is that the open, multi-vendor approach works at the limit. If the architecture holds at 82,000 concurrent users in a confined space, it holds for dense urban, enterprise, and rural deployments too. Open RAN gives operators genuine alternatives to single-vendor lock-in and opens the supply chain to smaller, specialist UK-based firms working on RAN software, intelligent controllers, and small cell hardware.
The Six Nations comes and goes. But what was proved at Twickenham stays: Open RAN is not a lab experiment — it is a production-ready architecture, tested under the most demanding conditions the UK mobile network has to offer. Ultimately however, the real measure of success will not be a single stadium trial but whether UK operators adopt Open RAN as standard practice in their network rollout plans, and on that question, we are still in the early stages.