An integrated soft handoff approach to IP fast reroute in wireless mobile networks

S. Cevher, Ta Chen, Ibrahim Hökelek, Jaewon Kang, V. Kaul, Yow-Jian Lin, Marcus Pang, M. Rodoper, S. Samtani, C. Shah, J. Bowcock, G. B. Rucker, J. Simbol, A. Staikos
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引用次数: 7

Abstract

This paper presents an integrated approach to IP fast reroute (IPFRR) of both unicast and multicast paths in wireless mobile networks. A distinct feature of the proposed approach is that, instead of modifying existing routing protocols, it employs a soft handoff technique, i.e., temporarily installs pre-computed Loop Free Alternative Paths (LFAPs) until the co-existing routing protocol converges to new routes. The proposed approach builds on our previously proposed IPFRR technology and uses the concept of pre-computed LFAPs not only for local but also for remote link failures within a certain neighborhood to achieve full alternative path coverage for a single link failure. This paper's contributions include: i) bandwidth efficient fast failure detection by integrating two novel mechanisms, namely probing and link quality prediction, ii) a novel method for calculating LFAPs, iii) a framework for switching seamlessly between LFAPs and OSPF paths, iv) a multicast fast reroute mechanism, and v) implementation in eXtensible Open Router Platform (XORP). We also present a generic framework for handling multiple simultaneous failures in the integrated IPFRR. The performance evaluation has been performed in both indoor and outdoor environments with real 802.11 radio links. The results confirm that our IPFRR technology consistently provides significant convergence time improvement during a single link failure event.
无线移动网络中IP快速路由的集成软切换方法
提出了一种无线移动网络中单播和组播路径的IP快速路由(IPFRR)集成方法。该方法的一个显著特点是,它不修改现有的路由协议,而是采用软切换技术,即临时安装预先计算的无环路替代路径(LFAPs),直到共存的路由协议收敛到新的路由。提出的方法建立在我们之前提出的IPFRR技术的基础上,并使用预先计算的LFAPs概念,不仅用于本地链路故障,还用于特定邻域内的远程链路故障,以实现单个链路故障的完全替代路径覆盖。本文的贡献包括:i)通过集成两种新机制(即探测和链路质量预测)来实现带宽高效的快速故障检测,ii)计算lfap的新方法,iii)在lfap和OSPF路径之间无缝切换的框架,iv)多播快速重路由机制,v)在可扩展开放路由器平台(XORP)中实现。我们还提出了一个处理综合IPFRR中多个同时故障的通用框架。性能评估已在室内和室外环境下进行了真实的802.11无线电链路。结果证实,我们的IPFRR技术在单链路故障事件中始终提供显着的收敛时间改进。
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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