topic Re: Sudden Wi-Fi antenna changes in Wireless

Sudden Wi-Fi antenna changes

hvalles01 — Fri, 11 Apr 2025 03:01:07 GMT

I have the following problem:

We have installed Meraki MR76 devices, which initially have good antenna strength.

Users connect to the Wi-Fi network without any problems. However, at random times, out of the 20 users who connect, 2 or 3 randomly lose connection and connect to another MR more distant, despite having a nearby antenna.

This happens randomly; they are not the same users; it always varies, but out of the 20, 2 or 3 have this incident.

We created a heat map and have seen that the antennas' spectrum is correct, and we don't see any co-channel interference.

What we have been able to detect are sudden changes in RSSI and SNR. Electromagnetic noise, or ROGUE, is probably causing unexpected roaming for some users.

Good roaming should occur before the RSSI or SNR reach very low values to avoid dropouts. But some events show that the user waited until the signal strength was very poor before switching APs, for example:

Event:
RSSI: -84 -> -52
SNR: 11 -> 43

This means the signal strength was very poor before roaming, and improved significantly afterward. They probably waited too long to switch.

Something similar may have happened to you.

Thanks in advance.

Images attached.

Conexion Estable

Eventos de Cambios de antena - Roaming

Re: Sudden Wi-Fi antenna changes

CMR — Fri, 11 Apr 2025 06:42:15 GMT

Roaming is decided by the client, what type of devices are they? You might be able to configure them to roam earlier.

Re: Sudden Wi-Fi antenna changes

joey.debra — Fri, 11 Apr 2025 16:44:15 GMT

Have you measured between those 2 access points you give as an example?
For an example an Iphone will start looking to roam at -70 but the neighboring AP needs to be at least 10 dB higher at that point before it does so. Perhaps you hare not having enough overlap.

Also if you are using MA-ANT-20 make sure the AP's are not mounted over 8 meters above ground. Especially in the 5 GHz there is a large null zone at 45 degrees both above and below the antenna.