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Modeling path duration distributions in MANETs and their impact on reactive routing protocols

机译:在MANET中建模路径持续时间分布及其对反应式路由协议的影响

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We develop a detailed approach to study how mobility impacts the performance of reactive mobile ad hoc network routing protocols. In particular, we examine how the statistics of path durations including probability density functions vary with the parameters such as the mobility model, relative speed, number of hops, and radio range. We find that at low speeds, certain mobility models may induce multimodal distributions that reflect the characteristics of the spatial map, mobility constraints and the communicating traffic pattern. However, this paper suggests that at moderate and high velocities the exponential distribution with appropriate parameterizations is a good approximation of the path duration distribution for a range of mobility models. Analytically, we show that the reciprocal of the average path duration has a strong linear relationship with the throughput and overhead of dynamic source routing (DSR), which is also confirmed by simulation results. In addition, we show how the mathematical expression obtained for the path duration distribution can also be used to prove that the nonpropagating cache hit ratio in DSR is independent of velocity for the freeway mobility model. These two case studies illustrate how various aspects of protocol performance can be analyzed with respect to a number of significant parameters including the statistics of link and path durations.
机译:我们开发了一种详细的方法来研究移动性如何影响反应式移动自组织网络路由协议的性能。特别是,我们研究了包括概率密度函数在内的路径持续时间的统计量如何随诸如移动性模型,相对速度,跳数和无线电范围之类的参数而变化。我们发现,低速行驶时,某些流动性模型可能会诱发多峰分布,从而反映出空间地图,流动性约束和交通流量模式的特征。但是,本文表明,在中等和较高的速度下,具有适当参数设置的指数分布可以很好地近似一系列移动模型的路径持续时间分布。分析表明,平均路径持续时间的倒数与动态源路由(DSR)的吞吐量和开销具有很强的线性关系,这也得到了仿真结果的证实。此外,我们展示了如何为路径持续时间分布获得的数学表达式也可以用于证明DSR中非传播的高速缓存命中率与高速公路移动性模型的速度无关。这两个案例研究说明了如何针对大量重要参数(包括链路和路径持续时间的统计数据)分析协议性能的各个方面。

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