I am fairly new to OpenWRT. I am using the Xiaomi Mi Router 4A Gigabit Edition.
My problem is that I want to configure my wireless network right and for that I would need not only the RSSI value and channels but also the noise value.
When typing in the command "iwinfo", it shows me "Noise: unknown". I have read that the driver can influence whether this works or not, but can I change the driver and is there even another driver for my device?
I also found a similar post: WNDR3700v3 Noise Level
Do you mean on a client, for example a phone or notebook?
They only show the RSSI, and I would need the RSSI and the Noise to calculate the SNR. From digging around the internet I know that some devices that run OpenWRT support this feature, but my access point only shows "Noise: unknown".
There it shows me Signal: -56dBm and Quality: 74%
Can you link me a page where these values are explained? I am a little bit confused, because on Channel Analysis it shows "Signal: Local Interface: -10 dBm".
As mentioned above, I'm asking you to provide your SNR numbers, by hovering your mouse over the WiFi bars on the LuCI Status page for each connected device.
So if that BSSID has no associations...that's why it's displaying -10 dBm in Channel Analysis.
But I don't think the device can detect noise, since, when typing in "iwinfo" in the terminal, it says "Noise: unknown". But maybe one can change that through changing the driver or something of this nature.
It could very well be that 2.4GHz is getting to it's limits in my area. There are many access points around our apartment that use the 2.4GHz band. But I want to further research this problem I have, and for that I need the SNR.
But I do not think that the signal, that is displayed for each associated station, is the SNR but just the Signal. When I go to Status > Realtime Graphs > Wireless > wlan0, I see that the Noise Level stays the same at -100 dBm all the time. Here is a screenshot:
And when I connect to the access point via SSH, and type in "iwinfo", I see the information "Noise: unknown". I think, as of now, my access point cannot measure the noise, and thats why it's always at -100 dBm. My inital question was, if I can get the access point to meassure the noise, so that I can then calculate the SNR. Maybe I just have to install a new driver on my access point, but I don't know. My access point is a Xiaomi Mi Router 4A Gigabit Edition.
Yeah, I see the same thing there for my 2.4 Ghz radio.
However, it's not consistent with what I see on the Status page (OpenWRT 21.02.1)...which also shows the SNR on for my devices, and it doesn't match the WiFi analyzer I use as a "second opinion".
As mentioned, get an analyzer and start gathering info with it.
I tried different devices (notebooks and phones) and different wifi analyzers, but non show the noise.
But whatever, maybe somebody finds a solution, so that my access point can measure it. And maybe I should switch to 5GHz, but I then would need two more access points. But 2.4GHz looks like this at my place:
Since I'm not familiar with this and since noise might not be a fixed value but change over time: Would you mind explaining a bit more for what exactly you need the noise figures?
