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Two schedulers to provide delay proportion and reduce queueing delay simultaneously

机译:两个调度程序可提供延迟比例并同时减少排队延迟

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The proportional delay differentiation model provides controllable and predictable delay differentiation, that is, the packet delay proportion between two classes of services is consistent on any measured timescale. Previous studies have focused on improving the accuracy of the achieved delay proportion between classes, and have not considered reducing the packet queueing delay, since these proposed scheduling algorithms are independent of the packet service time, such that the mean queueing delay is invariant, as specified by the conservation law. This paper proposes maximum WTP (MWTP) and variance WTP (VWTP) schedulers, modified from the waiting-time priority (WTP) algorithm which is an excellent scheduler for performing proportional delay differentiation. All of the proposed schedulers account for the packet transmission time. Simulation results indicate that when the link utilization is moderate, the two schedulers not only yield more accurate delay proportions than the WTP scheduler, regardless of whether the timescale is long or short, but also reduce the mean queueing delay. The effects of load distribution, packet size, and coefficient of variation (CoV) of packet sizes, on the performance of all schedulers are also investigated. Our proposed schedulers always outperform WTP.
机译:比例延迟微分模型提供了可控制和可预测的延迟微分,即两类服务之间的数据包延迟比例在任何测量的时间尺度上都是一致的。先前的研究集中在提高类之间实现的延迟比例的准确性上,并且没有考虑减少数据包排队延迟,因为这些建议的调度算法与数据包服务时间无关,因此,平均排队延迟不变。根据保护法。本文提出了最大的WTP(MWTP)和方差WTP(VWTP)调度程序,它是从等待时间优先级(WTP)算法修改而来的,该算法是执行比例延迟微分的出色调度程序。所有建议的调度程序都考虑了数据包的传输时间。仿真结果表明,当链路利用率适中时,无论时间长短如何,这两个调度程序不仅比WTP调度程序产生更准确的延迟比例,而且还减少了平均排队延迟。还研究了负载分配,数据包大小以及数据包大小的变异系数(CoV)对所有调度程序性能的影响。我们建议的调度程序始终胜过WTP。

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