信道特征感知路由协议的设计

Rupa Krishnan, Ashish Raniwala, T. Chiueh
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引用次数: 14

摘要

现实世界无线网络的无线电信道质量往往表现出短期和长期的时间变化,通常难以建模。为了最大限度地提高无线电资源的利用效率,将无线电信号质量的这些时间波动纳入无线路由决策至关重要。在本文中,我们探讨了在制定路由决策时利用准确的实时无线电信道质量信息的设计考虑。具体而言,我们提出了一种通道特征感知路由协议(CARP),该协议(1)使用每包传输时间来估计无线链路的有效剩余容量,(2)采用带宽概率分布模型来更好地近似无线路径的容量概况,以及(3)应用多路径路由来利用可选路径之间的多样性,并在无线链路质量存在时间波动的情况下提供更稳健的吞吐量。我们在一个小型化的多跳无线网络测试平台MiNT-m上评估了结合这些机制的性能增益。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Design of a Channel Characteristics-Aware Routing Protocol
Radio channel quality of real-world wireless networks tends to exhibit both short-term and long-term temporal variations that are in general difficult to model. To maximize the utilization efficiency of radio resources, it is critical that these temporal fluctuations in radio signal quality be incorporated into wireless routing decisions. In this paper, we explore the design considerations in leveraging accurate real-time radio channel quality information when making routing decisions. Specifically, we propose a channel characteristics-aware routing protocol (CARP) that (1) uses per-packet transmission time to estimate the effective residual capacity of a wireless link, (2) employs a bandwidth probability distribution model to better approximate a wireless path's capacity profile, and (3) applies multi-path routing to exploit diversity among alternative paths and deliver more robust throughputs despite temporal fluctuations in wireless link quality. We evaluated the performance gains of incorporating each of these mechanisms on a miniaturized multi-hop wireless network testbed- MiNT-m.
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