As full‑fibre broadband penetration deepens and enterprise, industrial, and smart‑city deployments scale up, wireless networks in the UK are hitting hard limits on capacity, especially in busy indoor and urban environments. The familiar 2.4 GHz and 5 GHz bands are increasingly congested, while mobile mid‑band spectrum is under pressure in city centres.
To address this, Ofcom has set out a landmark shared‑spectrum strategy for the Upper 6 GHz band (6425–7125 MHz), explicitly designed for both advanced Wi‑Fi and future mobile broadband, including 5G capacity expansion and early 6G‑style services. This is one of the first spectrum frameworks in Europe that is built around structured sharing between Wi‑Fi and mobile rather than exclusive allocation to one side.
This post takes a technical look at how the band is split, how the Wi‑Fi and mobile sides will actually work, the role of Automated Frequency Coordination (AFC), and why this matters for industrial IoT and UK network architecture.
1. The Regulatory Anatomy: How Upper 6 GHz Is Divided
The 6 GHz range in the UK is now broadly considered in two parts:
- Lower 6 GHz: 5925–6425 MHz
- Upper 6 GHz: 6425–7125 MHz
Lower 6 GHz has already been opened for Wi‑Fi 6E, primarily for low‑power indoor use. The new focus is Upper 6 GHz, which has historically been home to fixed microwave links and satellite earth stations. Rather than handing this entire 700 MHz block exclusively to mobile network operators or keeping it fully licence‑exempt for Wi‑Fi, Ofcom has opted for a split‑priority structure.
- The Wi‑Fi priority segment (6425–6585 MHz) is intended primarily for low‑power indoor Wi‑Fi. It effectively extends the existing 6 GHz Wi‑Fi allocation, creating larger contiguous chunks for ultra‑wide channels and high‑density indoor deployments.
- The mobile priority segment (6585–7125 MHz) is aimed primarily at commercial mobile broadband (4G/5G, with an eye to 6G), using sub‑national licensing focused on high‑density areas, transport hubs, enterprise campuses and other locations where mobile traffic is most intense.
In addition, there is a parallel plan to expand use of Lower 6 GHz beyond low‑power indoor, enabling higher‑power outdoor Wi‑Fi and fixed wireless access, controlled via AFC to protect incumbent users. Taken together, this turns the entire 6 GHz range into a flexible resource spanning indoor Wi‑Fi, outdoor Wi‑Fi, fixed wireless and mobile capacity.
2. Wi‑Fi in 6 GHz: Architecture, Capabilities and Real‑World Behaviour
For iotuk readers, 6 GHz is where Wi‑Fi 6E and Wi‑Fi 7 become practical tools rather than just new logos on access points. The additional spectrum allows Wi‑Fi to scale alongside fibre and dense IoT without drowning in interference from legacy devices.
2.1 Channelisation and Capacity
Compared with the 5 GHz band, 6 GHz more than doubles the available spectrum for Wi‑Fi and, crucially, it is reserved for modern devices. That means no legacy 802.11b/g/n clients dragging down airtime efficiency.
Key characteristics:
- Channel width:
- In Lower 6 GHz (5925–6425 MHz), there is already enough room for several 160 MHz channels or a large number of narrower channels (for example, up to a couple of dozen 20 MHz channels, depending on regional plans).
- Extending into 6425–6585 MHz adds further channel options. Indoor networks can carve out multiple 160 MHz channels for high‑throughput applications or build more finely segmented 40/80 MHz plans for different SSIDs, VLANs and QoS profiles.
- Clean ecosystem:
Only Wi‑Fi 6E and Wi‑Fi 7‑class hardware can access 6 GHz, which removes legacy clients from the contention domain. This directly reduces collisions, airtime waste and latency compared with mixed‑generation networks where ancient devices share channels with modern ones. - Performance envelope:
With 160 MHz channels in 6 GHz, practical indoor throughput in the 1–2 Gbit/s range is achievable on supported clients, with latency in the low single‑millisecond range under good RF conditions. For many real‑world applications, Wi‑Fi in 6 GHz behaves more like a short‑range fibre extension than a best‑effort radio link.
This is particularly relevant in environments where fibre‑to‑the‑premises (FTTP) is already in place, but internal Wi‑Fi has become the bottleneck as users add 4K video, cloud gaming, collaboration tools and large numbers of IoT devices.
2.2 Low‑Power Indoor First: Phase 1
The first phase of Upper 6 GHz is deliberately Wi‑Fi‑centred. Low‑power indoor Wi‑Fi is due to be authorised across the band as early as possible, with an indicative target around 2025–2026.
This Wi‑Fi‑first phase has several practical effects:
- It aligns the UK with markets that already ship significant volumes of 6 GHz‑capable kit, allowing routers, laptops, handsets and industrial gateways to be deployed without waiting for mobile 6 GHz rollout.
- Homes, offices, campuses and public buildings get an early upgrade path away from congested 2.4/5 GHz, particularly in locations where user density and device counts are high.
- Vendors of enterprise and industrial gear can plan SKUs and firmware for UK‑specific 6 GHz usage, knowing the indoor Wi‑Fi rules ahead of mobile deployments.
From a design perspective, this phase is attractive because engineers can treat 6 GHz as a relatively predictable indoor band, free from nearby high‑power mobile transmitters for the first few years. That simplifies RF modelling and allows experimentation with dual‑band and tri‑band topologies (2.4/5/6 GHz) without full cross‑system coexistence challenges.
2.3 Extended Use via AFC in Lower 6 GHz
Lower 6 GHz will not remain “indoor‑only”. Under Ofcom’s proposals, outdoor and higher‑power Wi‑Fi will be authorised in this band under the control of an AFC database.
This unlocks:
- High‑capacity campus networks covering university grounds, stadiums, rail hubs and industrial yards with outdoor APs operating at higher powers, but still kept within interference limits relative to incumbents.
- Fixed wireless access as a complement to fibre where physical deployment is difficult, allowing operators or enterprises to use 6 GHz links to bridge buildings, sites or rural properties.
The price of this flexibility is complexity. Enterprise APs and industrial routers will need AFC client support (for spectrum queries) and robust geolocation capabilities to comply with power and channel assignments.
3. Mobile in Upper 6 GHz: Capacity Band and 6G Stepping Stone
On the mobile side, upper 6 GHz occupies a strategic slot above the 3.5 GHz mid‑band workhorse but below mmWave. It is best thought of as a capacity overlay band tailored to where demand is highest.
3.1 Capacity Offload and Site Re‑Use
Mobile traffic is not evenly distributed. A small fraction of sites—city centres, major stations, shopping areas, sports venues—carry a disproportionate share of total traffic. Upper 6 GHz gives operators a new set of “lanes” for these hotspots.
Operators can:
- Offload heavy data traffic in dense zones onto upper 6 GHz, relieving pressure on 3.5 GHz while keeping broader coverage layers as they are.
- Re‑use existing macro and small‑cell sites by adding 6 GHz radios and antennas, rather than building completely new grids, since upper 6 GHz still has workable propagation for dense urban environments.
- Provide more consistent user experience for crowded events, rush‑hour commutes and urban corridors where existing bands are saturated at busy times.
Where RF planning is carefully handled, upper 6 GHz can deliver higher per‑site capacity than 3.5 GHz in similar grid layouts, giving operators headroom without resorting to extreme densification or blanket mmWave deployments.
3.2 6G Foundations and Advanced Services
Upper 6 GHz is also part of the spectrum story for 6G‑class services:
- It offers the bandwidth for advanced features such as network‑native AR/VR, low‑latency industrial control, and high‑definition cloud gaming delivered over mobile rather than Wi‑Fi.
- It allows experimentation with architectures that combine cloud RAN, edge compute and dense mid/high‑band layers, without stepping immediately into the coverage and device‑density challenges of mmWave.
For operators, the regulatory assurance that mobile will be allowed into upper 6 GHz in a later phase provides confidence to plan 6G‑aligned upgrades over the 2030s. Wi‑Fi gets an early window to relieve congestion, but mobile knows it has a path into the same band when standards and European harmonisation mature.
3.3 Phase 2: Mobile Roll‑In
Mobile use of upper 6 GHz will follow once regional harmonisation and technical standards have progressed, with European discussions expected to clarify band usage around the latter part of this decade.
Phase 2 emphasises:
- Targeted deployment in high‑density urban and “high‑traffic” areas, rather than blanket nationwide use where demand is limited.
- Sub‑national licensing, allowing spectrum to be allocated specifically to regions or cities where operators and enterprises can justify investment.
- Coordinated coexistence with Wi‑Fi, enforced through technical conditions and AFC to prevent destructive interference.
From a planning point of view, mobile engineers can treat upper 6 GHz as a future layer sitting on top of existing mid‑bands, with stronger policy constraints around where and how it is used, but clear benefits in the places that matter most.
4. Coexistence and Interference Management: The Role of AFC
Sharing a band between high‑power outdoor mobile and lower‑power indoor/outdoor Wi‑Fi is not straightforward. Without coordination, overlapping channels can produce severe mutual interference, wiping out most of the performance gains both sides are trying to achieve.
To avoid that, Ofcom’s framework leans on hybrid sharing mechanisms, with AFC as the central control tool.
4.1 AFC Basics
Automated Frequency Coordination is essentially a cloud‑based, geospatial spectrum management system. It acts as a dynamic referee between different users of the band.
In practice, AFC:
- Maintains detailed records of licensed users (such as mobile base stations and protected fixed links), including their locations, antenna patterns, heights and power levels.
- Receives queries from Wi‑Fi APs and other standard‑power devices that wish to operate in regulated portions of the band. These devices report their own locations and technical parameters.
- Responds with allowed channels and power limits, ensuring the device stays within a safe interference envelope relative to nearby incumbent and mobile operations.
This model allows more flexible, higher‑power unlicensed use without sacrificing the protection required by licensed services and existing incumbents.
4.2 Hybrid Sharing Approaches
On top of AFC, there are broader sharing patterns that Ofcom is testing and refining:
- Indoor–outdoor split:
- Wi‑Fi is predominantly deployed indoors.
- Mobile base stations are mostly outdoors.
- By tuning power limits and relying on building attenuation, indoor Wi‑Fi can be prioritised across most of the band while still protecting outdoor mobile transmitters.
- Geographical sharing:
- Most mobile traffic is concentrated in specific areas.
- Mobile can be prioritised in these high‑traffic urban hotspots, while Wi‑Fi retains priority elsewhere.
- In some regions, Wi‑Fi may effectively dominate 6 GHz; in others, mobile may have stronger rights, depending on demand and agreed rules.
Ofcom’s consultations on hybrid sharing and high‑density area definitions are aimed at turning these concepts into practical coexistence rules that industry can implement.
4.3 Implications for Equipment and Standards
For vendors and integrators, AFC and hybrid sharing have direct engineering consequences:
- Access points, routers and gateways that target outdoor or higher‑power use in 6 GHz will need AFC client functions in firmware, along with accurate geolocation (GPS, GNSS or trusted location data).
- Chipsets on both Wi‑Fi and mobile sides will have to support sensing and signalling capabilities that enable spectrum etiquette and, potentially, more advanced cross‑system detection schemes.
- Standards bodies such as IEEE, 3GPP and the Wi‑Fi Alliance will need profiles and test plans aligned with the UK’s specific regulatory framework, so devices behave correctly when deployed under Ofcom’s rules.
For iotuk’s audience, this is where RF planning, standards engineering and regulation converge. AFC is not just an administrative database; it becomes part of the control plane for advanced Wi‑Fi and fixed wireless networks in the UK.
5. Why This Matters for IoT, Edge and Industrial Architecture
Ofcom’s shared 6 GHz blueprint is more than a spectrum tweak. It shapes how IoT and edge architectures will be designed in the UK over the next decade, especially in environments where both Wi‑Fi and mobile are relied upon for mission‑critical functions.
5.1 Deterministic Wireless for OT and IT
Industrial and logistics environments increasingly rely on wireless for operational technology (OT):
- Automated guided vehicles and robots demand low‑latency, high‑reliability links for navigation and control.
- Machine‑vision cameras stream high‑resolution video to edge servers for quality assurance and safety.
- Dense sensor grids feed data into analytics platforms for real‑time optimisation and monitoring.
The extended 6 GHz Wi‑Fi band offers wide, relatively interference‑free channels that can be dedicated to OT workloads, reducing contention with general IT traffic on 2.4/5 GHz or lower mobile bands. At the same time, upper 6 GHz mobile provides an additional capacity layer for backhaul, redundancy or public/private cellular overlays in high‑density factory districts and ports.
5.2 RF Planning and Coexistence in Industrial Sites
Industrial campuses deploying both Wi‑Fi 6E/7 and private or public mobile in 6 GHz will need more deliberate RF planning than before:
- Band segmentation: OT‑focused Wi‑Fi may be concentrated in the Wi‑Fi‑priority segment, while mobile or private cellular uses the mobile‑priority portion. Directional antennas, filters and building materials can help keep these domains separated.
- Power strategies: In Lower 6 GHz, AFC‑controlled outdoor APs can provide coverage for yards, loading bays and external machinery. Indoor low‑power APs can serve internal OT and IT systems with minimal spill‑over.
- Interference modelling: RF engineers will need to simulate cross‑system interference, especially in reflective environments or sites with high‑gain antennas where indoor and outdoor fields may couple more strongly than rules assume.
The reward for this extra design work is the ability to run converged OT/IT networks that truly exploit multi‑gigabit Wi‑Fi and high‑capacity cellular without the “spectrum cliff” behaviour seen in congested legacy bands.
5.3 Hardware Roadmaps and AFC Integration
Device manufacturers and integrators targeting the UK need to adapt hardware and software roadmaps to the 6 GHz reality:
- Enterprise APs and industrial routers must support multi‑band 6 GHz operation alongside AFC client functions if they are to participate in outdoor or standard‑power scenarios.
- IoT gateways for campuses and smart‑city deployments should include flexible, software‑defined radios capable of shifting between 2.4/5/6 GHz in line with AFC assignments and local RF policies.
- Private 5G and, later, 6G solutions should consider upper 6 GHz as an option alongside existing mid‑band holdings, particularly in factories, ports and stadiums where both Wi‑Fi and mobile will coexist.
For IoT platform providers and system integrators, aligning connectivity blueprints with the phased timeline (Wi‑Fi first, mobile later) is key to avoiding stranded assets and ensuring that new deployments can evolve as upper 6 GHz fills out.
5.4 Policy Signal and European Context
By committing to a shared model and explicitly designing a coexistence framework for upper 6 GHz, the UK becomes a testbed for hybrid spectrum policies.
Potential implications include:
- If European harmonisation follows a similar path, economies of scale for 6 GHz hardware and unified device profiles will make UK deployments easier to export and interoperate.
- If other regulators opt for more exclusive allocations, the UK’s experience will serve as a case study on the benefits and challenges of shared mid/high‑band spectrum for Wi‑Fi and mobile.
For UK IoT and connectivity players, this is both an opportunity and a responsibility: early access to shared 6 GHz capacity can provide competitive advantages, but it also requires close tracking of evolving standards and regional policies to stay aligned with cross‑border requirements.
For the formal regulatory detail, engineers and architects should refer directly to Ofcom’s published statements and consultations on 6 GHz spectrum sharing, available via Ofcom’s website.