Mon Feb 07, 2022 10:22 pm
This will be difficult for every 2.4GHz router. This spectrum is crowded, and channels not under your control overlap. Quite some try to use 40MHz wide channel (20-Ce, 20-eC) what makes it worse.
Basic rule is to co-exist in 20 MHz wide channels 1,6 or 11 (2412,2437,2462) and have no overlap. The neighbors don't allow this.
So mitigation actions are required.
Tuning requires so much feedback, that it is impossible to give a step-by-step guideline.
Some possible actions are, (results to be checked)
1: Move away from 2.4GHz. The 5 GHz band normally is much cleaner and has more channels to share. Requires different 2-band router (hAP ac, hAP ac2, hAP ac3, ... and many more)
2: As @enlace101 said: stop using b-protocol (use g/n) , and only 20 MHz wide (no Ce, eC or XX) (Band and Channel width)
2: Reduce noise sensitivity (parameter under advanced: Adaptive noise immunity)
4: The top-5 in "scan" are the killing AP's. -44dBm must be closeby or under your control. Item 1,3,4,5 are wide channel. 2 is on channel 13 and smaller. Those AP's destroy each others transmissions due to wide channels. They could have used 2412/20, 2437/20, 2462/20 as 3 independent non-interfering channels.
Less specific actions , when desperate ...
5. For coexistence with neighbors use in Advanced tab: HW protection mode = "CTS to self".
6. To avoid destructive interference, lower the packet size: AMSDU limit = 2048 , AMSDU Threshold = 2048. Or even test a lower value. But this will slow down the transmission as well.
Feedback information is in the registration table for each connection (detailed view or extra columns added) : CCQ, TX/RX Frames <versus> TX/RX HW Frames ratio (learns about retransmits)