Wi-Fi Channel Allocation

Wi-Fi channel allocation refers to the standardized assignment of frequency channels within the 2.4 GHz, 5 GHz, and 6 GHz bands. These allocations are essential for ensuring coexistence, minimizing interference, and achieving regulatory compliance across regions and device types.

Technical Principles

Channel Spacing

• 2.4 GHz: Uses 5 MHz spacing; channels significantly overlap unless separated by at least 25 MHz. The standard non-overlapping channels are 1, 6, and 11.

• 5 GHz / 6 GHz: Use 20 MHz base spacing; support channel bonding into wider bandwidths (e.g., 40, 80, 160, or 320 MHz).

Channel Bandwidth Modes

• HT20/40 (Wi-Fi 4 / 802.11n)

• VHT80/160 (Wi-Fi 5 / 802.11ac)

• EHT320 (Wi-Fi 7 / 802.11be)

Channel Center Frequencies

Each channel number corresponds to a fixed center frequency.
Example: Channel 36 = 5180 MHz in the 5 GHz band.

Regulatory Considerations

• DFS (Dynamic Frequency Selection) and TPC (Transmit Power Control) apply to specific 5 GHz frequency ranges. U-NII-2A/U-NII-2C are U.S./Canadian designations; European requirements are specified by frequency range.

• AFC (Automated Frequency Coordination) is required for standard-power 6 GHz devices in markets that authorize this device class, including the United States. This must not be transferred to European LPI/VLP operation.

• Indoor/outdoor use and power limits must be enforced through firmware and hardware configurations in accordance with regional rules.

Device Certification

For regulatory approval, Wi-Fi-capable devices must demonstrate:

• Use of allowed channels per region

• Proper DFS response and radar detection (if applicable)

• Compliance with channel bandwidth declarations and Occupied Bandwidth limits

• Enforcement of indoor/outdoor restrictions and power limits

Testing standards include:

• United States

  • FCC §15.247 – Requirements for DSSS, FHSS, and digital modulation in 2.4 GHz and 900 MHz bands

  • FCC §15.407 – Technical rules for 5 GHz U-NII bands, including DFS, TPC, and emission limits

• Europe

  • EN 300 328 – Harmonized standard for 2.4 GHz WLAN, Bluetooth, and other ISM-band systems

  • EN 301 893 – Requirements for 5 GHz Wi-Fi (DFS/TPC, spectrum sharing, channel access)

  • EN 303 687 – Harmonized standard for European 6 GHz LPI and VLP equipment in 5945–6425 MHz; it does not cover standard-power/AFC operation

• Canada

  • RSS-247 – Certification standard for 2.4 GHz and 5 GHz license-exempt WLAN and Bluetooth devices

Tool Support:

Use the Wi-Fi Channel Explorer to visualize allowed channels, center frequencies, DFS status, and regional availability across the 2.4 GHz, 5 GHz, and 6 GHz bands.