Poor wifi performance for apple devices

[l.buschi]

my wireless network is composed by 9100 EWC controllers.

Everithing is ok apart from apple devices which have poor performances. On apple devices I note very poor signal strenght.

Is there any special configuration to apply in order to let apple work fine?

Tks

Johnny

[Mark Elsen]

 Ref : https://www.cisco.com/c/dam/en/us/td/docs/wireless/controller/technotes/8-6/Enterprise_Best_Practices_for_iOS_devices_and_Mac_computers_on_Cisco_Wireless_LAN.pdf   , the configuration examples are aireos based , change them according to 9800/EWC based settings , 

 M.

[JPavonM]

If apple devices do see very poor signal strength (compared with other devices such as Androids or Windows) then this seem to be a defect with the driver/firmware that maybe fixed with a code upgrade.

[Leo Laohoo]

What is the firmware of the controller?