WLAN access points generally operate on the same frequency band as Thread (2.4 GHz) and may directly interfere with the Thread radio signal.

As a rule, WLAN only minimally interferes with signal strength on a Thread network since Thread operates outside the normal WLAN frequency band (by default over channel 25 or channel 26).

However, a crowded incorrectly configured WLAN network can significantly affect the Thread radio communication.

WLAN and Thread channel overlapping

For additional information on interference from WLAN, Thread and Zigbee networks see 'Wireless basics training' and 'ZigBee and WLAN coexistence'. See also 'Related documentation'.

Consider the following measures on highly crowded networks (as shown in the figure below):

  • Use WLAN channels 1 and 6 for WLAN devices.
  • Free up WLAN channel 11 and configure the Thread network to channels 25 or 26, so that the Thread network has sufficient frequency spectrum to establish a stable and reliable communication.
  • Do not mount TBR, TME, and SED devices directly next to WLAN access points or repeaters.
  • Separate TBR, TME and SED devices from each other as far as possible.
  • Move some WLAN services to 5 GHz range to free up part of the spectrum in the 2.4 GHz range for Thread.
  • See if devices operating on WLAN, such as WLAN repeaters, WebEx conference stations, smart/digital white boards, may also be operated over Ethernet.
Network scan of crowded WLAN infrastructure