Wi-Fi router with GNSS

Automated Frequency Coordination (AFC) is vital for rolling out 6 GHz Standard Power (SP) compatible Wi-Fi Access Points, and geolocation is a vital technology for implementing AFC.

This u-blox page explores the topic of AFC and Wi-Fi and demonstrates how you can use u-blox technology to create AFC-compliant Wi-Fi access points (APs).

• Introduction
• What Is Automated Frequency Coordination (AFC)
• Why GNSS is essential for AFC compliance
• u-blox GNSS solutions for AFC-compliant Wi-Fi APs
• Questions and answers

Introduction

In 2020, the Federal Communications Commission (FCC) decided to open the 6 GHz band for unlicensed Wi-Fi and began one of the biggest regulatory shifts in the history of Wi-Fi. This new spectrum enables Wi-Fi 6E/7 and upcoming Wi-Fi 8 to deliver multi-gigabit speeds, lower latency, and additional capacity for high-density deployments. 

Since the announcement, three distinct operational classes of Wi-Fi have been classified in the regulatory frameworks of various countries: 

1. Low Power Indoor (LPI), for indoor-only deployments
2. Very Low Power (VLP), for portable use
3. Standard Power (SP), for full indoor/outdoor operation

Of these three classes, Standard Power (SP) is the true performance multiplier. SP access points can operate at significantly higher transmit power than LPI or VLP (up to 36 dBm EIRP), increasing the effective range of the AP and improving throughput over larger distances. These advantages directly translate into meaningful improvements across residential, enterprise, and outdoor deployments, such as:

• Enterprise indoor networks (offices, manufacturing floors, logistics hubs)
• Large-scale venues (stadiums, arenas, convention centers)
• Campus and municipal Wi-Fi
• Outdoor APs on poles, rooftops, and service corridors
• Hospitality, transportation terminals, and cruise ships

However, with higher power comes stricter protection requirements. The 6 GHz band is already home to licensed incumbent systems, such as fixed microwave backhaul used by mobile operators, utilities, and public-safety agencies. To ensure coexistence, SP devices in the U.S. and Canada must operate under Automated Frequency Coordination (AFC). AFC uses the AP’s location to determine what channels and power levels are safe to use.

As a result, accurate and reliable positioning is now an integral part of a Wi-Fi access point’s job. Before an AP can transmit at Standard Power in 6 GHz, it must be able to prove where it is, along with a measure of how accurate that position is. For Wi-Fi, in the 6 GHz era, location is no longer optional; it is the gateway to full performance and regulatory compliance. 

What is Automated Frequency Coordination (AFC)?

Automated Frequency Coordination is a cloud-based system that manages how SP Wi-Fi APs use the 6 GHz band. Regulators such as the FCC in the US and ISED in Canada require APs to consult an AFC service before transmitting. The 6 GHz band is already occupied by important licensed incumbents. AFC’s purpose is to allow new Wi-Fi deployments while preventing interference with existing users.

In practice, an AFC system maintains a detailed, cloud-based database of licensed incumbent users in the 6 GHz band. To operate at Standard Power, a 6 GHz access point must first determine its own geolocation and uncertainty – that is, the margin of error in the position estimate, then send this information securely to an approved AFC provider. Using this location, the AFC engine performs a propagation and interference analysis and returns the list of channels and maximum transmit power the device is permitted to use at that exact location. The AP must follow those limits and re-query the AFC regularly; if it cannot reach the service, it must reduce power or stop Standard Power operation altogether.

The overall AFC workflow follows a strict regulatory sequence:

1. Geolocation Request:
   The AP must automatically determine its geographic coordinates (longitude and latitude), antenna height, and associated location uncertainty (in meters) with a confidence level of 95%. This geolocation capability must be automatic; manual entry of coordinates is prohibited.
    
2. Data submission:
   The device sends its location, along with identifiers such as FCC ID and serial number, to the AFC system using a secure protocol (e.g., HTTPS/TLS).
    
3. Propagation and interference modeling:
   The AFC engine analyzes the device’s location against incumbent data (e.g., FCC ULS records), taking into account distance, terrain, antenna patterns, and protection criteria.
    
4. Channel authorization:
   Based on this analysis, the AFC returns the list of allowed channels and the maximum EIRP the device may use. These limits must honor all FCC protection and exclusion zones.
    
5. Device operation:
   The access point can only operate within the channels and power limits authorized by the AFC and must use the industry standard AFC API to receive this information.
    

It’s clear that accurate, verifiable geolocation is a strict operational requirement of AFC. It is no longer enough for Wi-Fi OEMs, enterprise vendors, and network operators to label a product “AFC-capable”; the AP must consistently produce 95% confidence-bound positioning that the AFC system can trust.

Why GNSS is essential for AFC compliance

Since an AP must know where it is and be able to prove it to a regulator, an AFC-compliant AP needs a method of geolocating itself that is accurate and trustworthy. If the AP reports an inaccurate position or an uncertainty radius that is too large, the AFC will limit its power, restrict its channels, or deny Standard Power operation altogether.

Manual address entry, installer apps, smartphone assisted scans, or IP-based location cannot produce the repeatable accuracy or statistical confidence required for AFC authorization. These methods may support installation workflows, but they cannot be the primary source of regulatory geolocation – indeed, manual entry of location is prohibited. 

While a range of geolocation technologies exists, the one that offers the best blend of performance, scalability, and ease of deployment is Global Navigation Satellite Systems, or GNSS.

GNSS provides globally consistent performance, delivering data that meets and exceeds accuracy standards. Importantly, it offers a direct way to compute the 95% confidence radius that AFC workflows depend on. GNSS is most effective outdoors, where it generally can achieve high levels of accuracy – ideal for many SP deployments. However, even in challenging indoor environments where GNSS signal is not always strong, such as high-rise office buildings or near windows, specially designed GNSS receivers can still deliver stable position and uncertainty estimates, something alternative techniques cannot reliably do.

u-blox GNSS solutions for AFC-compliant Wi-Fi APs

As Standard Power Wi-Fi evolves into the 6 GHz band, manufacturers need a dependable way to determine and verify an AP’s location. u-blox addresses this need with Standard Infrastructure GNSS (SIG) firmware, a firmware developed specifically for fixed infrastructure such as enterprise Wi-Fi access points.

SIG runs on the upgradeable u-blox M10 and F10 hardware platforms and delivers reliable, confidence-bound positioning that meets the strict requirements of AFC systems.

• u-blox M10 is a high-sensitivity, low-power single-band GNSS receiver suitable for mainstream Wi-Fi 6E/7 access points.
• u-blox F10 is a dual-band (L1/L5) receiver offering improved multipath resilience and higher accuracy for demanding enterprise and outdoor AP deployments.

Both M10 and F10 platforms are widely used across automotive, industrial, and IoT markets, giving Wi-Fi OEMs confidence in long-term reliability and availability. They will also be compatible with Wi-Fi 8 when it is released, likely in 2028.

Optimized for static installations, SIG firmware is tuned for the places where APs live, ceilings, walls, poles, and APs installed near windows, where signal obstruction and multipath are common. The firmware provides: 

• Stable, static-mode tracking for fixed AP placements
• Consistent and repeatable uncertainty estimation (95% confidence-bound)
• Dependable accuracy in non-line-of-sight (NLOS) environments, such as ceilings, corridors, or installations near windows

Many access points are installed indoors or near windows, where GNSS visibility is limited, and signal levels are low. To address these challenges, SIG can be used with the u-blox AssistNow assistance service. AssistNow delivers satellite orbit, clock, and timing data over an internet connection, helping the receiver compute a position fix significantly faster, even when satellite signals are weak or obstructed.

By reducing startup time and improving sensitivity in tough signal conditions, AssistNow enables the access point to establish a stable 95% confidence-bound geolocation much more quickly. This accelerates installation, improves reliability in AFC requests, and allows the AP to begin safe Standard Power 6 GHz operation without delay.

For OEMs building next-generation Wi-Fi 6E/7/8 access points, SIG offers a proven and flexible solution that works across multiple Wi-Fi chipset vendors. This avoids platform lock-in, reduces development effort, simplifies AFC compliance, and helps maximize available 6 GHz spectrum and power.