This article is an introduction on the RF Environment: Scan and Suggested Channel features.
NOTES & REQUIREMENTS: Applicable to all RF-capable access points (Gen 2 and above), on firmware version 3.8.12+ and UniFi Network Controller software version 5.7.X and above.
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Normally, channel planning is a multi-step process that requires a lot of time to do it properly. The WiFi spectrum must be scanned, manually analyzed, and a channel plan created. Suggested Channels does this automatically: after an RF scan has been triggered, the best channel found will be selected and automatically set, based on how busy the channel is, the RSSI of the channel, and whether or not the same SSID is already transmitting on that channel.
How to Set Up Suggested Channels
Very little is required to set up Suggested Channels. The scanning UniFi Access Point (UAP) must be on firmware version 3.8.12 or higher and be using controller v5.7.x or higher. Follow these steps to set up the Suggested Channels feature:
1. In the UniFi Network Controller go to the Devices tab and click on the desired UAP to open the Properties Panel.
2. In the UAP's Properties Panel go to Config > Radios.
3. Set the Channel to "Auto". And save your changes.
4. Now navigate to Tools > RF Environment to start an RF Scan by clicking the Scan button.
When the RF scan is complete, the UAP will automatically set the radio to the best channel. This decision is based on how busy the channel is, the RSSI of the channel, and whether or not the same SSID is already transmitting on that channel.
NOTE: Suggested Channels is mainly intended for low-density networks that have a relatively static RF environment. Because the RF scan is manual (except in the case of the UAP-SHD), if the RF environment changes frequently, you will have to frequently re-scan for the optimal channel to be chosen.