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首页> 外文期刊>Networking, IEEE/ACM Transactions on >Network Protection for Mesh Networks: Network Coding-Based Protection Using p-Cycles
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Network Protection for Mesh Networks: Network Coding-Based Protection Using p-Cycles

机译：网状网络的网络保护：使用p循环的基于网络编码的保护

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摘要

p-cycles have been proposed for preprovisioned 1:N protection in optical mesh networks. Although the protection circuits are preconfigured, the detection of failures and the rerouting of traffic can be a time consuming operation. Another survivable mode of operation is the 1+1 protection mode, in which a signal is transmitted to the destination on two link disjoint circuits, hence recovery from failures is expeditious. However, this requires a large number of protection circuits. In this paper, we introduce a new concept in protection: 1+N protection, in which a p-cycle, similar to FIPP p-cycles, can be used to protect a number of bidirectional connections, which are mutually link disjoint, and also link disjoint from all links of the p-cycle. However, data units from different circuits are combined using network coding, which can be implemented in a number of technologies, such as next generation SONET (NGS), MPLS/GMPLS, or IP-over-WDM. The maximum outage time under this protection scheme can be limited to no more than the p-cycle propagation delay. It is also shown how to implement a hybrid 1+N and 1:N protection scheme, in which on-cycle links are protected using 1:N protection, while straddling links, or paths, are protected using 1+N protection. Extensions of this technique to protect multipoint connections are also introduced. A performance study based on optimal formulations of the 1+1, 1+N and the hybrid scheme is introduced. Although 1+N speed of recovery is comparable to that of 1+1 protection, numerical results for small networks indicate that 1+N is about 30% more efficient than 1+1 protection, in terms of the amount of protection resources, especially as the network graph density increases.
机译：已提出将p周期用于光学网状网络中预先设置的1：N保护。尽管保护电路是预先配置的，但故障检测和流量重新路由可能是一项耗时的操作。另一种可行的操作模式是1 + 1保护模式，在该模式下，信号在两个链路不相交的电路上传输到目的地，因此从故障中恢复很快。但是，这需要大量的保护电路。在本文中，我们引入了一个新的保护概念：1 + N保护，其中的p周期类似于FIPP p周期，可用于保护许多双向连接，这些双向连接相互链接不相交，并且链接与p周期的所有链接不相交。但是，来自不同电路的数据单元使用网络编码进行组合，可以通过多种技术来实现，例如下一代SONET（NGS），MPLS / GMPLS或IP over WDM。该保护方案下的最大中断时间可以限制为不超过p周期传播延迟。还显示了如何实现1 + N和1：N混合保护方案，其中使用1：N保护来保护循环链路，而跨接链路或路径则使用1 + N保护来保护。还介绍了此技术的扩展，以保护多点连接。介绍了基于1 + 1、1 + N和混合方案的最优公式的性能研究。尽管1 + N的恢复速度与1 + 1保护的速度相当，但小型网络的数值结果表明，就保护资源的数量而言，1 + N的效率比1 + 1保护大约高30％，尤其是网络图密度增加。

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