Wifi controller

[Translator]

Hello, 
My company has a historic wifi network that is beginning to show its limits, we would like to update it. 
It consists of a cisco 5508 controller, and a hundred AP702, AP1602, AP2602 terminals. 

Would it be possible to replace the controller while keeping the existing terminals, and then replace some terminals with new ones that perform better along the way? 

Thank you 

[Leo Laohoo]

If there are a lot of 1600/2600/3600, keep the 5508.

Only update the 5508 if the APs can get upgraded because the new 9800 will not support the 1600/2600/3600.  And, after 17.13.X, the 700 will not be supported either. 

[marce1000]

 - Replace the controller with a model of the modern 9800 series (which also offers a virtual controller) ; AP702  , AP1602 are no longer  supported ,better replace with modern APs too     ; for compatibilities look at :
                     https://www.cisco.com/c/en/us/td/docs/wireless/compatibility/matrix/compatibility-matrix.html

 M.