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CZFan
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Need help with WiFi in Apartments/Flats

Mon Sep 02, 2019 1:29 pm

Hi,

I need some help as per subject line. Have an estate where +- 1500 Mikrotik units are deployed at each Apartment / Flat, 99% of these Mikrotiks are Hap Lites with the odd Hap AC2 here and there.

The problem is, some of these apartments/flats are very small, i.e. 1 bedroom units with only a single wall between the one units bedroom and the one next to it. They are also multi story buildings.
Now you getting interference from all these units around you, i.e. had a situation so bad the other day, that the person could not even connect to their own mikrotik wifi which was like 2 meters away from them. Had to reduce the WiFi channel to 20MHz, did a frequency scan and selected the least used frequency and set it to 2GHz G only and only then could the customer connect.

My question is, how can I set these routers wifi to not impact each other and is there a way to reduce the "noise / interference" from other units. My initial thinking is to run a script remotely and reduce all routers to only 20MHz channel width and only use 2GHz G only, or is there better ways for situations like these?
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erlinden
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Re: Need help with WiFi in Apartments/Flats

Mon Sep 02, 2019 2:23 pm

On the 2G radio only channel 1, 6 and 11 have no overlap (depending on country legislation, there could be more channels). Besides 2G has a higher penetration than 5G.

To summarize:
- lower transmission power to absolute minimum reuirements
- select channels to get least interference
- on 2G radio only use 20MHz bandwidth...period
- do (only if possible) use 5G radio (40MHz bandwidth, tranmission to lower power and select channels with least interference)
 
anav
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Re: Need help with WiFi in Apartments/Flats

Mon Sep 02, 2019 4:50 pm

Sounds like one is screwed to provide a decent service per room at least wirelessly.
Wired is easy. Perhaps a general building wifi with internet access only so that all can use smart phones but not networked at all.
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Re: Need help with WiFi in Apartments/Flats

Mon Sep 02, 2019 10:11 pm

Sounds like one is screwed to provide a decent service per room at least wirelessly.
...

It is a bit of a "damned if you do and damned if you don't" situation. The customers want to sit in their bedroom and get the full speed of the internet they pay for on wifi, so if you set settings accordingly, then you cause interference for others
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R1CH
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Re: Need help with WiFi in Apartments/Flats

Tue Sep 03, 2019 12:42 pm

Set antenna gain to like 16 dB to lower the TX power, if the rooms are so small there's no point blasting the signal all over the complex. On the devices that support 5 GHz, disable 2.4 GHz radio and use 5 GHz only.
 
DSK
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Re: Need help with WiFi in Apartments/Flats

Tue Sep 03, 2019 2:54 pm

https://mum.mikrotik.com/presentations/ ... 286214.pdf

Above link should be of immense help in solving the WiFi issues.
 
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Re: Need help with WiFi in Apartments/Flats

Tue Sep 03, 2019 8:46 pm

https://mum.mikrotik.com/presentations/ ... 286214.pdf

Above link should be of immense help in solving the WiFi issues.
Thx, some serious RF Knowledge there (Ron Touw)
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mrmut
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Re: Need help with WiFi in Apartments/Flats

Thu Sep 05, 2019 9:38 pm

As erlinden said, cut down the Rx power as much as yuou can. I think you can safely reduce it to 21-22.

As for channels, the 1, 6 and 11 is definitely the only way to go. I had channels set to automatic in my installation, and the situation wasn't good at all. Just create three channel values one below the other, and the AP will auto decide what to use.

Also, connect to your CAPs and see the signal levels on them, bg analyser, if adjacent same channel APs are below -80 db signal , you are safe, but aim for less. I managed to get my installation so APs don't see other APs on the same channel at all.

As for 5GHz vs 2.4GHz, I think that is overrated. It is hard to set up 2.4, but signal propagation is really good and if you do it right it will work as a dream.

Remember - you have two limiting factors:

1. signal levels from devices
2. interference

Work with that in mind, and you are done.

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