分组调度及模糊优先级调度对自组网单播通信的影响

C. Gomathy, S. Shanmugavel
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引用次数: 3

摘要

在移动自组织网络中,节点的移动性和无线介质的易出错特性给网络带来了许多挑战和丢包问题。在这里,由于节点是移动的,网络拓扑结构会随着时间的推移迅速而不可预测地变化,并产生不同的排队行为。因此,调度算法可以根据数据包的优先级对其进行调度,从而提高网络的性能。通常,自组织网络中的包调度器优先控制包而不是数据包,并按FIFO顺序提供数据包。本文提出了一种基于模糊的移动自组织网络优先级调度器,以动态源路由(DSR)、自组织按需距离矢量路由(AODV)和无线路由协议(WRP)作为底层单播路由协议来确定数据包的优先级。我们发现在数据包之间设置优先级可以显著降低端到端延迟。利用GloMoSim对该调度器的性能进行了研究,并根据数据包传送率、平均端到端延迟和吞吐量等定量指标对其进行了评估。通过对不同单播路由协议在不同移动条件下的测试,发现调度器整体上提高了系统的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of packet scheduling and evaluation of fuzzy based priority scheduler on ad hoc network unicast communication
In mobile ad-hoc network, the mobility of nodes and the error prone nature of the wireless medium pose many challenges and packet losses. Here, since the nodes are mobile, the network topology changes rapidly and unpredictably over time and produce different queuing behaviour. Hence, a scheduling algorithm to schedule the packets based on their respective priorities will improve the performance of the network. Typically, packet schedulers in ad hoc networks give priority to control packets over data packets and serve data packets in FIFO order. Here, we present an fuzzy based priority scheduler for mobile ad-hoc networks, to determine the priority of the packets using dynamic source routing (DSR), ad hoc on demand distance vector routing (AODV) and wireless routing protocol (WRP) as the underlying unicast routing protocols. We find that setting priorities among data packets decrease the end to end delay significantly. The performance of this scheduler is studied using GloMoSim and evaluated in terms of quantitative metrics such as packet delivery ratio, average end to end delay and throughput. It is found that the scheduler provides overall improvement in the performance of the system, when tested with different unicast routing protocols under different mobility conditions.
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