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The possible usage scenarios of a WiMax service network are extremely various. The network can support static and mobile users roaming in a metropolitan area, the kind of traffic can be the typical Internet browsing or real-time traffic with stringent QoS constraints. The components of a WiMax network must assure that all these needs are fulfilled. To reach this goal, all the layers of the OSI stack are required to cooperate in order to guarantee security, session establishment, fast handover and correct quality levels. The IEEE 802.16 family of standards is focused on the radio and MAC layers so it doesn't give any indication on how to manage the networking back-end.
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