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Network coding for improving throughput in WDM optical networks with dedicated protection

机译：网络编码，通过专用保护来提高WDM光网络的吞吐量

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摘要

Network coding (NC) has been recently emerging as an excellent technique for leveraging network efficiency. In optical networks,NC and protection appear to be a good match and indeed, NC could be effectively exploited for greater protection efficiency thanks to the opportunity of combining signals rather than duplication in the traditional approach. Motivated by this observation, we investigate the application of a simple and practical NC technique based on XOR operation to improve the network throughput in survivable optical networks.To this end, we propose the NC-based protection whose speed recovery is on a par with the conventional 1+1 dedicated protection while the capacity usage could be more efficient, paving the way for improving throughput in constrained capacity conditions. A novel mixed integer linear programming model is developed for survivable optical networks design employing the proposed NC-based protection. The model attempts to optimally determine the demands to serve, the routing for served demands and NC assignment among demands aiming at maximizing the network throughput in the constraint of bandwidth limitation. Extensive numerical evaluations on realistic topologies are provided to highlight the advantages of our NC-based protection proposal compared with the conventional dedicated protection in improving the network throughput. Encouraging results are observed when the new protection proposal based on NC could accommodate up to 30% more traffic than the conventional case.
机译：网络编码（NC）最近已成为一种利用网络效率的出色技术。在光网络中，NC和保护似乎是很好的匹配，实际上，由于可以组合信号而不是在传统方法中进行复制，因此可以有效地利用NC来提高保护效率。基于这种观察，我们研究了一种基于XOR操作的简单实用的NC技术在提高可生存光网络中网络吞吐量方面的应用。为此，我们提出了基于NC的保护，其速度恢复与传统的1 + 1专用保护，同时容量使用效率更高，从而为在容量受限的情况下提高吞吐量铺平了道路。利用提出的基于NC的保护，为可生存的光网络设计开发了一种新颖的混合整数线性规划模型。该模型试图优化确定服务需求，服务需求的路由以及需求之间的NC分配，目的是在带宽限制的约束下最大化网络吞吐量。提供了有关实际拓扑的大量数值评估，以突出我们的基于NC的保护建议与常规专用保护相比在提高网络吞吐量方面的优势。当基于NC的新保护提议可以比传统情况下多容纳30％的流量时，就会看到令人鼓舞的结果。

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