Evolutions of the Mobile Systems
->1G Analog systems
-> 2G systems
* voice communication
* Circuit Switched
... -> 2.5G systems
* Circuit switching for voice
* Packet switching for data
-> 3G systems
* Packet switching for voice and data
* High speed
* Compatible with different access technologies
->3.5G systems
* Evolved Radio Interface
* IP based core Network
* Compatible with different access technologies
-> 4G systems
* New Air Interface
* Very High bit rate services
* Convergence of Wireline, Wireless, and IP worlds