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Providing differentiated Quality of Service (QoS) over unreliable wireless channels is an important challenge for supporting several future applications. The authors analyze a model that has been proposed to describe the QoS requirements by four criteria: traffic pattern, channel reliability, delay bound, and throughput bound. They study this mathematical model and extend it to handle variable bit rate applications. They then obtain a sharp characterization of schedulability vis-a-vis latencies and timely throughput. Their results extend the results so that they are general enough to be applied on a wide range of wireless applications, including MPEG Variable-Bit-Rate (VBR) video streaming, VoIP with differentiated quality, and Wireless Sensor Networks (WSN).
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