TETRA > ESN X BUILDING CONNECTIVITY

Don't Let Your Building Become a Connectivity Liability

The UK's emergency communications network is undergoing its biggest transformation in a generation. For building owners, the implications go well beyond blue-light services.

Most people have never heard of TETRA. But every police officer, firefighter and paramedic in England, Scotland and Wales has relied on it every day since it was introduced as the Airwave network - the mission-critical radio system that keeps emergency services communicating when it matters most.

That is about to change fundamentally.

The UK Government's Emergency Services Network known as ESN is replacing Airwave entirely. Rather than operating on a dedicated TETRA radio network, ESN shifts emergency communications onto 4G/LTE mobile broadband, using EE's network with IBM as systems integrator. The upgrade unlocks secure voice, live video, real-time data, mapping and applications for frontline responders. It is, in every sense, a step forward.

But it comes with a dependency that didn't exist before.

ESN runs on mobile broadband. That means it relies on the same signal infrastructure and faces the same signal barriers - as every other 4G and 5G device. The Home Office has been explicit: sufficient mobile coverage is an essential precondition before any emergency service can safely migrate from Airwave to ESN. Without adequate indoor mobile coverage, the transition cannot happen safely.

The timeline matters. ESN is expected to reach Full Voice Service Ready by March 2028, with phased migration following through the late 2020s. Airwave will not switch off overnight but the direction is set, and estates teams across police, fire, ambulance, NHS trusts, hospitals, transport hubs, local authorities and public buildings are already beginning to assess their indoor connectivity position.

Here is where building owners and estates directors need to pay close attention.

Modern energy-efficient buildings, the glazed offices, hospitals, civic buildings and transport facilities that make up a significant proportion of the UK's operational estate are often the worst performers when it comes to signal penetration. The same Low-E coatings and metallic layers in high-performance glazing that deliver thermal efficiency create what engineers call a Faraday cage effect, attenuating the external 4G and 5G signals that ESN depends upon. A building that functions adequately for voice calls today may become a genuine liability when emergency communications shift to mobile broadband.

The conventional answer - installing active systems such as DAS, repeaters or small cells introduces cost, complexity and disruption that many estates cannot easily absorb, particularly in operational healthcare, custody and public-facing environments.

There is a more elegant starting point.

Before committing to full active infrastructure, the first question an estate team should ask is where the signal loss is actually occurring. In many glazed buildings, the primary attenuation point is the building envelope itself. Where that is the case, WAVETHRU by Wave by AGC deployed across the UK by INCO Robotics offers a targeted, non-disruptive and passive alternative. A laser-based treatment applied in-situ to existing glazing allows 4G, 5G and critical communications signals to pass through freely, without hardware, without power consumption and without disruption to building occupants. It does not replace active infrastructure where genuine coverage gaps exist. It reduces the scale, cost and complexity of what active infrastructure needs to do.

As the UK moves toward an emergency communications network that depends entirely on mobile signal solutions, the buildings that support that network - hospitals, control rooms, transport facilities, command locations cannot afford to be the weak link.

Indoor connectivity is no longer a tenant amenity. For a growing number of buildings, it is becoming a public safety requirement.