Was just wondering if anyone has any insight into this. I have an issue with IPADs roaming when connected to a specific SSID in a large campus network design. The APs are managed via a WLC from HP. I know when you lock the screen and reconnect at a diff AP you have the issue of the IOS trying to reconnect to the mac of the last AP - however the problem exists without the screen locking. It takes the Ipad several seconds (<10) to find the new AP and use it. I have deactivated band steering (this would try and force the AP to use 5GHz and takes ages..) for the specific SSID and have mapped it to all AP. Perhaps someone has other ideas?
There's quite a few issues that can cause things like this to happen. I've had a quick look around and apparently there's a common issue with iPhone/iPads roaming where your authentication is WPA+WPA2. You want to set either WPA2/AES or WPA/TKIP.
If you can get on the controller, I would run debug (I don't know with HP WLCs) to try and ascertain whether the iPad is disconnecting from the WLAN entirely, or if the connection is dropping, but it remains associated.
Other than that, run through the basics, make sure its not the iPad acting up by testing it somewhere else, preferably on a different WLAN (probably not possible), make sure no other devices are suffering from the same problem.
Sorry I can't be more specific, but I've not used any of the HP WLCs before.