5 GHz coverage

[peter.matuska1]

Hi,
I have Cat 9115 with 2,4G and 5G enabled. There is one place in a building with weak signal (below 20dB on 5G) and roaming between 2,4G and 5G occurs a lot. Sometimes the connection is droped during the roaming process which is annoying (FT is enabled). My question is whether or not it is possible to do the roaming to 5G only if the signal is better than e.g. 30dB. So in this case the device will use 2,4G all the time at that place.

thank you

[Leo Laohoo]

Wireless clients make the ultimate decision to roam. 

But if wireless coverage is inadequate, it will not make any difference until more APs are installed.  

[docjb0221]

I find that one quick way to control roaming is to require minimum data rates. So, for example, if you require 12mbps on 2.4 ghz (and can meet that) and require 24mbps on 5ghz (and can't meet that), that could reduce your chances of moving to 5g since you won't meet the minimum required data rate. This is controlled through RF profiles and I believe you can apply specific RF profiles to specific APs.

[Flavio Miranda · Accepted solution]

Hi

 You can tuny the roaming configuration on the client wireless adapter, if possible in your case. Usually, at least Intel, has three roaming level. We can´t say how the control it exactly but the obvious alternative would be the signal strenght.

 Another possibility would be play with RX-SOP and Optimized roaming on the WLC side. And one last alternative would be Band Select.

But, at the end, clients decide.

[peter.matuska1]

thank you, I will play with suggested parameters.

[David Ritter]

Peter,

Do remember that wifi signal strength is defined in the negative.  Signal levels in the positive tend to cook meat or heat water.

That being said the typical signal level might be -40 dbm right under the AP  and quite usable at -60. with a roaming target level of -80?

Signal to Noise is defined in the positive relative to the noise.