HW081: What to Do About the 6GHz Upper Band Split
Keith Parsons discusses how the 6 GHz Wi-Fi band is splitting along regional lines, with the lower half settled for Wi-Fi globally but the upper half contested between Wi-Fi and mobile carriers. The US has the full 1200 MHz for Wi-Fi, the UK is pursuing a sharing model, and the EU is leaning toward reserving most of the upper band for future mobile use. This has significant implications for network designers working across multiple regions.
Summary
In this solo episode of Heavy Wireless, Keith Parsons breaks down the regulatory fragmentation occurring in the 6 GHz spectrum band (5925–7125 MHz), which represents the largest single chunk of spectrum ever allocated to Wi-Fi. The core issue is that while the lower half of the band (roughly 5925–6425 MHz) has been broadly settled for Wi-Fi use across the US, UK, EU, and many other regions, the upper half (6425–7125 MHz) is now the subject of a significant regulatory fight between Wi-Fi proponents and mobile/cellular carriers.
In the United States, the FCC opened the entire 1200 MHz band for unlicensed use in 2020. Low Power Indoor (LPI) mode works across the full band without coordination requirements, while Standard Power mode enables outdoor and higher-power use but requires AFC (Automatic Frequency Coordination), where an AP queries a database to confirm channel availability. Parsons describes the US situation as the most favorable for Wi-Fi designers, with the full band available.
The UK's regulator Ofcom has taken a middle-ground approach for the upper band, splitting it into two priority zones: the bottom 160 MHz of the upper band is designated as Wi-Fi priority, while the top 550 MHz is mobile priority — though Wi-Fi can access it via AFC if mobile is not actively using it. This makes AFC a mandatory requirement for upper-band access in the UK, not an optional feature.
The EU's Radio Spectrum Policy Group (RSPG) has issued opinions recommending mobile priority across most of the upper 6 GHz band, with only limited Wi-Fi access permitted. Parsons attributes this to Europe's mobile carrier lobby carrying more weight in spectrum policy decisions, partly influenced by international (ITU) processes that leaned toward mobile in that frequency range.
Parsons also addresses the practical consequences for hardware and network design. Access points use regulatory domain settings to determine legal channels per country, meaning the same hardware may operate very differently — or be legally restricted — depending on where it's deployed. He warns against assuming vendor data sheets reflect real-world channel availability in all regions. He also cautions against over-relying on 320 MHz channels, noting that even in the US only three non-overlapping 320 MHz channels exist in the full 1200 MHz band, and in the EU or UK such wide channels are essentially impractical. His design guidance: US designers can use the full band with confidence; UK designers should build flexibility into upper-band plans; EU designers should not anchor any designs on the upper 6 GHz band at all.
Key Insights
- Parsons argues that the EU's lean toward reserving the upper 6 GHz band for mobile is driven by Europe weighting mobile carrier interests more heavily than the US FCC did, partly influenced by international ITU spectrum processes.
- Parsons claims that even in the US — the most favorable region for Wi-Fi — the entire 1200 MHz band yields only three non-overlapping 320 MHz channels and seven 160 MHz channels, making vendor marketing around wide channels misleading in practice.
- Parsons contends that the UK's AFC-based sharing model for the upper band means AFC is not optional for Wi-Fi operators seeking upper-band access in that country — it is a mandatory coordination requirement tied to mobile incumbency protection.
- Parsons warns that the same physical access point hardware may be legally restricted from transmitting on upper 6 GHz channels in the EU or UK that it freely uses in the US, making country regulatory domain settings more consequential than they were in previous Wi-Fi generations.
- Parsons argues that network designers should treat the upper 6 GHz half as a region-specific design variable — not part of a unified global channel plan — and recommends documenting design assumptions explicitly so future engineers understand the regulatory context at the time of design.
Topics
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