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The IEEE 802.16 system called WiMAX (Worldwide Interoperability for Microwave Access) provides quality of service (QoS) of several types for different service. The WiMAX is expected to support QoS for real time application, such as Voice over IP (VoIP). In this paper, when network congestion occurs, the VoIP bit-rate needs to be adapted to achieve the best speech quality. We propose a new scheme called...
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