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Packet and flow scheduling algorithms for WiMAX has been a topic of interestfor a long time since the very inception of WiMAX networks. WiMAX offersadvantages particularly in terms of Quality of service it offers over a longerrange at the MAC level. In our work, we propose two credit based schedulingschemes one in which completed flows distributes the left over credits equallyto all higher priority uncompleted flows(ODRREDC) and another in whichcompleted flows give away all the excess credits to the highest priorityuncompleted flow(ODRRSDC). Both the schemes are compatible with 802.16 MACprotocol and can efficiently serve real time bursty traffic with reducedlatency and hence improved QOS for real time flows. We compare the two proposedschemes for their latency, bandwidth utilization and throughput for real timeburst flows with the opportunity based Deficit Round Robin scheduling scheme.While the ODRR scheduler focuses on reducing the credits for the flows witherrors, our approach also distributes these remaining credits together with thecredits from completed flows equally among the higher priority uncompletedflows or totally to the highest priority uncompleted flow.

Modified Opportunistic Deficit Round Robin Scheduling for improved QOS in IEEE 802.16 WBA networks