Wireless Access

i am using the APs aruba 207 and managed by the mobility controller 7010

is there is a way to know the bandwidth usage per client , i mean the usage starting from the first connection with the wireless network . not only live statistics also hisorical statistics . even the client disconnects from the wireless network and re-connect again , his prevoius usage is still shown . i mean per ip usage 

The controller does not have room for historical information about clients. The standards-based way to get this information is radius accounting.