IEEE 802.16 WBA网络中改进QOS的改进的启发式亏损轮询调度
Modified Opportunistic Deficit Round Robin Scheduling for improved QOS in IEEE 802.16 WBA networks
摘要：
自WiMAX网络诞生以来，WiMAX的分组和流调度算法一直是人们感兴趣的话题。WiMAX提供了优势，特别是在MAC级的较长范围内提供的服务质量方面。在我们的工作中，我们提出了两个信用的调度方案，其中一个完成的流分配剩余的信用平等地所有高优先级未完成的流（ODRREDC），另一个完成的流放弃所有多余的信用的最高优先级未完成的流（ODRRSDC）。这两种方案都与802.16 MAC协议兼容，并能有效地服务于实时的突发业务，减少了延迟，从而提高了实时的流的QOS。我们比较了这两种方案的延迟，带宽利用率和吞吐量的实时的突发流与基于机会的赤字轮循调度方案。虽然ODRR调度程序的重点是减少信用的错误流，我们的方法也分配这些剩余的信用与信用从完成的流之间的高优先级未完成的流或完全的最高优先级未完成的流。
英文摘要：
Packet and flow scheduling algorithms for WiMAX has been a topic of interest for a long time since the very inception of WiMAX networks. WiMAX offers advantages particularly in terms of Quality of service it offers over a longer range at the MAC level. In our work, we propose two credit based scheduling schemes one in which completed flows distributes the left over credits equally to all higher priority uncompleted flows(ODRREDC) and another in which completed flows give away all the excess credits to the highest priority uncompleted flow(ODRRSDC). Both the schemes are compatible with 802.16 MAC protocol and can efficiently serve real time bursty traffic with reduced latency and hence improved QOS for real time flows. We compare the two proposed schemes for their latency, bandwidth utilization and throughput for real time burst flows with the opportunity based Deficit Round Robin scheduling scheme. While the ODRR scheduler focuses on reducing the credits for the flows with errors, our approach also distributes these remaining credits together with the credits from completed flows equally among the higher priority uncompleted flows or totally to the highest priority uncompleted flow.
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