"Simple" is kind of relative ... and you don't mention a budget.
MRTG is a free tool that will report stats and graphs to a web page ... but you need to have an idea of SNMP and OIDs to really configure it to that level. There are other tools with varying degrees of simplicity and utility (what's up & some others ... ranging down to Kismet and Netstumbler).
The Cisco WLSE can do monitoring; it's fairly simple, but it's not inexpensive.
Can you narrow it down a little further? What have you looked at (if anything) so far? What skill sets and / or resources are at your/your customer's disposal?
Are you using Cisoo equipment? Which ? Aironet or Airespace?
I am using Cacti to display bandwidth usage graphs via a web server running on FreeBSD. Cacti will run on linux as well. From the info that I have gathered mrtg and cricket are more complex to setup. For me Cacti was a breeze. You may have to make some changes to the scripts for the wireless, but it shouldn't be too hard. Most of the scripts will work fine for Cisco devices. The url is www.cacti.net .
You can always download a demo of What's Up Gold to run on windows to get an idea of which way you would rather go. Either way it will require a PC to use for the data collecting and reporting.
As far as technology goes there ain't nothing simple about it!
IntroductionHow to use the Wireless LAN Controller Configuration Analyzer (WLCCA)
Javier Contreras is a Senior Tech Lead for the Wireless Business Unit in Cisco, with over 2 decades of experi...
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(#)For this reason being that : - application that doesn't use multicast, sends one copy of each packet ( data unit of traffic at layer 3 ) to each client (" who seeks the traffic ).- application that does use multicast, sends ...
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...