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Least loaded and route fragmentation aware RSA strategies for elastic optical networks

机译：弹性光网络的最低​​负载和路由碎片感知RSA策略

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摘要

Elastic optical networks (EONs) provide flexibility to assign wide range of spectral resources to the connection requests. In this manuscript, we address two issues related to spectrum assignment in EONs: the non uniform spectrum assignment along different links of the route and the spectrum fragmentation in the network. To address these issues, two routing and spectrum assignment (RSA) strategies have been proposed: Least Loaded RSA (LLRSA) and Route Fragmentation Aware RSA (RFARSA). The LLRSA allocates spectrum homogeneously along different links in the network, where as RFARSA accords priority to the routes which are less fragmented. To highlight the salient features of the two strategies, two new metrics, route fragmentation index (RFI) and standard deviation (SD) are introduced. RFI is defined as the ratio of non-contiguous FSs to the total available free FSs on the route, and SD relates to the measure of non-uniformity in the allocation of resources on the links in the network. A simulation program has been developed to evaluate the performance of the proposed (LLRSA and RFARSA) strategies, and the existing strategies of shortest path RSA (SPRSA) and spectrum compactness based defragmentation (SCD) strategies, on the metric of RFI, bandwidth blocking probability (BBP), network capacity utilized, and SD. The variation in the metrics on the basis of number of requests and the bandwidth (number of FSs) requested has been studied. It has been conclusively established that the proposed strategies (LLRSA and RFARSA) outperform the existing strategies in terms of all the metrics.
机译：弹性光网络（EON）提供了灵活性，可以为连接请求分配各种频谱资源。在本手稿中，我们解决了与EON中的频谱分配有关的两个问题：沿着路线的不同链接的非均匀频谱分配以及网络中的频谱碎片。为了解决这些问题，已经提出了两种路由和频谱分配（RSA）策略：最小负载RSA（LLRSA）和路由碎片感知RSA（RFARSA）。 LLRSA沿着网络中的不同链路均匀地分配频谱，因为RFARSA优先考虑零碎的路由。为了突出这两种策略的显着特征，引入了两个新指标：路由碎片指数（RFI）和标准差（SD）。 RFI定义为不连续的FS与该路由上可用的可用FS总数之比，​​SD涉及网络链路资源分配不均的度量。已经开发了一个仿真程序，以基于RFI度量，带宽阻塞概率来评估提议的（LLRSA和RFARSA）策略以及现有的最短路径RSA（SPRSA）策略和基于频谱压缩的碎片整理（SCD）策略的性能。 （BBP），使用的网络容量和SD。已经研究了基于请求数量和请求带宽（FS数量）的度量标准变化。最终已确定，就所有指标而言，拟议的策略（LLRSA和RFARSA）优于现有策略。

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