Such systems are from Cisco, Ubitiqu and other network makers. You can find them on the web so when I see this question it's often a new person on the web. That is, they don't know how to research with google.
I'm a student and want to manage wireless system of my school. The scenario is streaming a network and when student connect to the network they will redirected to the login page. Each student will be assigned with the unique userid and password with the total internet volume per each month with some determined speed. What resources I'll be needed and the hardware and software to implement these system ?