A restoration framework for partial failures in wireless networks

Yoann Foquet, D. Nace, M. Pióro, M. Poss
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引用次数: 1

Abstract

The purpose of the paper is two-fold. First, we introduce a general framework for extending restoration strategies developed for total link failures in a way enabling handling partial link failures as well. In particular, our framework combines a known rerouting method for total link failures (the so called Restricted Restoration - RR) and a recently developed restoration method for partial failures (called Flow Thinning - FT). In this way we achieve two goals: we define a unified approach to deal with both kinds of failures, and improve efficiency of FT. We study in detail such an extended version of RR (that can also be regarded as an extension of the MPLS Fast Reroute method) capable of managing links with variable capacities, (variable link capacities can be regarded as partial link failures). A general mathematical model for the framework, and a specific model for RR are presented together with numerical results. The second purpose is related to completeness of partial failures scenarios. In practice, partial failure scenarios correspond to partial losses in transmission capacity, occurring for example in wireless networks using microwave radio or free space optical transmission technology. As such failures are mainly caused by weather conditions, there arises a problem of how to translate weather conditions to link failures (this is necessary to ensure network robustness to weather conditions). We present a study on the way that different weather factors impact the transmission link capacity and how these effects can be measured.
无线网络部分故障的恢复框架
这篇论文的目的是双重的。首先,我们介绍了一个通用框架,用于扩展为总链路故障开发的恢复策略,使其能够处理部分链路故障。特别是,我们的框架结合了已知的用于总链路故障的重路由方法(所谓的受限恢复- RR)和最近开发的用于部分故障的恢复方法(称为流量稀释- FT)。通过这种方式,我们实现了两个目标:我们定义了一种统一的方法来处理这两种故障,并提高了FT的效率。我们详细研究了这种扩展版本的RR(也可以看作是MPLS快速路由方法的扩展)能够管理可变容量的链路(可变链路容量可以看作是部分链路故障)。给出了框架的一般数学模型和RR的具体模型,并给出了数值结果。第二个目的与部分故障场景的完整性有关。在实践中,部分故障场景对应于传输容量的部分损失,例如发生在使用微波无线电或自由空间光传输技术的无线网络中。由于此类故障主要由天气条件引起,因此出现了如何将天气条件转换为链路故障的问题(这是确保网络对天气条件的鲁棒性所必需的)。我们提出了一项关于不同天气因素影响传输链路容量的方式以及如何测量这些影响的研究。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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