Proptivity has chosen Telehouse London Docklands as the London hub for its UK rollout of shared Internet of Things (IoT) mobile infrastructure.
The site provides interconnection to UK mobile network operators (MNOs), alongside fibre-delivered, traceable timing from the National Physical Laboratory (NPL). This provides the accurate timing needed for high-performance indoor 5G systems and helps Proptivity deliver dependable indoor coverage in commercial buildings across the city.
Operational in Sweden
entering the UK market
coverage from multiple operators through one unified solution
Proptivity builds and operates shared indoor mobile infrastructure in commercial properties, so building occupants can rely on consistent 4G and 5G coverage from multiple operators through one unified solution. It manages the full lifecycle from design and installation through monitoring and maintenance, ensuring that property teams have no need to run separate projects with each individual operator.
Operational in Sweden since 2022, Proptivity expanded across the Nordics before entering the UK market in 2024. In the UK, it operates within a neutral host model that supports multiple operators from a single indoor deployment, while meeting the operational expectations associated with telecom-grade services.
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To scale its model in the UK, Proptivity required a London base that could support telecom-grade operations, fast connection into the operator ecosystem, and a delivery approach that could be repeated across many buildings. This meant creating a hub location where it could interconnect with operator core networks and then extend their services out to commercial properties across London, alongside extensive technical testing with each operator to prove the platform could carry subscriber traffic reliably.
To make that platform work consistently across multiple buildings, Proptivity sought out a practical means of delivering precise, traceable timing to every site (using fibre-delivered time traceable to NPL). Accurate synchronisation is a key requirement for indoor coverage. Proptivity required a dependable way to deliver precise time via Ericsson radios in corporate sites, especially where rooftop access for GNSS antennas is difficult or unavailable. With resilience also in sharper focus, there is growing interest in network-delivered alternatives because loss of synchronisation can quickly degrade performance and availability.
Equally, as operators expand 5G in mid-band Time Division Duplex (TDD) spectrum, time and phase synchronisation requirements become more stringent than in earlier Frequency Division Duplex (FDD) deployments. While Global Navigation Satellite System (GNSS) timing remains the preferred reference, rooftop access is limited in many commercial buildings, making fibre-delivered Precision Time Protocol (PTP) an effective alternative. Where possible, Proptivity can also use GNSS and PTP together, with one acting as a secondary reference to improve resilience.
These technical requirements also sit within a broader operational context. Telecoms infrastructure is tightly regulated, and discussions increasingly focus on assurance, physical security, and limiting dependencies outside the UK. Proptivity therefore needed a colocation partner with secure and reliable facilities, and the ability to grow as its building pipeline expanded.
Proptivity and Telehouse also worked with NPL to enable fibre-delivered, traceable timing for indoor sites where rooftop GNSS is impractical.
"With Telehouse’s help, we have successfully transported time between NPL’s master UK clock and high-performance 5G systems in London corporate cell sites. This has been achieved with sufficient accuracy to offer sterling 5G coverage for all three UK MNOs, enabling customers to use their mobile phones as they would expect.”
Proptivity selected Telehouse London Docklands as a hub for its UK deployments, benefiting from the campus’s established interconnection environment and suitability for telecoms infrastructure. From this base, Proptivity could connect into operator networks centrally and extend services out to enterprise buildings across London in a consistent, scalable way.
Ericsson supplies the indoor Radio Dot system and associated radio access network (RAN) and transport equipment used in Proptivity deployments, along with the software and management tools that support telecom-grade operations.
To meet the synchronisation requirement at scale, Telehouse helped Proptivity access fibre-delivered, traceable time sourced from NPL. This enabled accurate synchronisation for Ericsson 5G systems deployed indoors, without the need to secure rooftop antenna installations for every building, which can be impractical in many commercial properties.
Elena Parsons, Commercial Manager for Timing Services at NPL, said: “NPL maintains the UK national timescale and makes traceable time available to industry. For indoor 5G sites where rooftop GNSS is difficult, fibre-delivered timing can provide a practical alternative and an additional layer of resilience, helping networks remain stable even if satellite timing is disrupted.”
With the foundations in place, operational delivery also mattered day to day. Telehouse provided a facility designed for always-on services, supported by continuous site security and on-site engineering services, helping Proptivity keep deployments maintainable as the UK rollout progressed.
With Telehouse as its London hub, Proptivity has been able to underpin indoor 4G and 5G deployments with NPL-traceable timing and operational assurance required for enterprise environments. For building owners and occupiers, the benefit is largely invisible but highly valuable. Stable synchronisation helps indoor mobile networks perform consistently, supporting reliable calls, data, and latency-sensitive applications.
This supports stronger indoor mobile performance in buildings where external signals struggle to reach, helping occupiers and visitors stay connected across the workplace.
The approach has supported early UK delivery, including The Folgate Building in London, which Proptivity has described as its first high-performance small cell 5G indoor deployment with EE. It has also established a repeatable platform for future sites, giving Proptivity a stable base to add new buildings and onboard further operator services as the pipeline grows.
As Proptivity expands across London and beyond, Telehouse provides the resilient, secure foundation needed to support that growth, while helping ensure indoor connectivity keeps pace with what businesses and building users expect from mobile networks.
