Hello,
I hope you are doing fine
To answer your question I need to know if the access points and the wireless LAN controller are on the same subnet or not. If they are and mDNS is enabled then you should not have any problems following this:
http://www.cisco.com/c/en/us/td/docs/wireless/technology/bonjour/7-5/Bonjour_Gateway_Phase-2_WLC_software_release_7-5.html
Iif they are on different subnets then you need to make sure that multicast routing is configured for those subnets.
If this is not the issue then please post the software version that the wireless LAN controller is running and upload the WLC's configuration.