Multiple SSID on 1 Buliding

Tjn NhOk · Jan 12, 2014

Hey all,

I have a condominium for rent, it has about 50 rooms(and i have 50 customers). I provide internet for customer by wifi. But, my customer want to deploy the different SSID and key for their room. So, in each room i put one access point, they can manually config it.

=> The SSID in each room is different, but channel in many rooms is same (because my cus only uses channel 1,6,11 in 2,4Hz band).

So, it will make the wifi so bad. Can i fix it? And how?

Thank for reading and sorry if my English not good

bill001g · Jan 12, 2014

Yes you will have massive interference because of the channel overlaps. This makes no difference if you had 1 ssid or multiple. It is the same problem a corporate installation sees when they must deploys a large number of AP in the building.

Since you don't have one of the nice automated systems that can centrally control the devices you will have to do it all manually.

First is to try to allocate the channels to not have 2 rooms that are right next to each other share the same channels. This is made even worse by the fact that you really only have 1 channel in the 2.4 band and not three anymore. Since people are using 40mhz wide channels to get 150m ratings this means you use either channel 1,6 or 6,11. In both cases channel 6 is used.

If you can force everyone to use only 1 channel ie 20mhz.

Next since everyone has a router in their room their should be no need to be able to receive signal from anything but that one. You want to reduce the transmit power on the radios so they just barely cover the area you want with as little as possible transmission outside the area. Without a automated systems where the AP can see each other and determine each other power levels this is all going to be trial and error. now this only works if everyone reduces the powerlevel. If you have one person who decides not to it then becomes a competition for power and everyone will end up with nothing.

Tjn NhOk · Jan 12, 2014

bill001g :

Yes you will have massive interference because of the channel overlaps. This makes no difference if you had 1 ssid or multiple. It is the same problem a corporate installation sees when they must deploys a large number of AP in the building.

Since you don't have one of the nice automated systems that can centrally control the devices you will have to do it all manually.

First is to try to allocate the channels to not have 2 rooms that are right next to each other share the same channels. This is made even worse by the fact that you really only have 1 channel in the 2.4 band and not three anymore. Since people are using 40mhz wide channels to get 150m ratings this means you use either channel 1,6 or 6,11. In both cases channel 6 is used.

If you can force everyone to use only 1 channel ie 20mhz.

Next since everyone has a router in their room their should be no need to be able to receive signal from anything but that one. You want to reduce the transmit power on the radios so they just barely cover the area you want with as little as possible transmission outside the area. Without a automated systems where the AP can see each other and determine each other power levels this is all going to be trial and error. now this only works if everyone reduces the powerlevel. If you have one person who decides not to it then becomes a competition for power and everyone will end up with nothing.

Hi Bill,
Thank you about your advice, i will force everyone to use only channel 20mhz and test again

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Multiple SSID on 1 Buliding

Tjn NhOk

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Tjn NhOk

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