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Standard IEEE 802.16, commonly referred as WiMAX, is one of the most promising Broadband Wireless Access (BWA) technologies. BWA will allow to provide to users new emerging bandwidth demanding services, like IPTV, on-line gaming, etc. The main characteristic of new services is the need of Quality of Service (QoS) guarantees, in terms of bandwidth reservation, delay, jitter and packet loss. One of the most important features of WiMAX is the possibility that it offers to provide QoS to data flows. In fact, the standard defines several scheduling classes at MAC layer to treat service flows in a different way depending on QoS requirements.
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