دانلود رایگان مقاله طرح حفاظت ترکیبی کارآمد با مسیرهای پشتیبان گیری در شبکه نوری الاستیک

Abstract

Fast recovery and minimum utilization of resources are the two main criteria for determining the protection scheme quality. We address the problem of providing a hybrid protection approach on elastic optical networks under contiguity and continuity of available spectrum constraints. Two main hypotheses are used in this paper for backup paths computation. In the first case, it is assumed that backup paths resources are dedicated. In the second case, the assumption is that backup paths resources are available shared resources. The objective of the study is to minimize spectrum utilization to reduce blocking probability on a network. For this purpose, an efficient survivable Hybrid Protection Lightpath (HybPL) algorithm is proposed for providing shared or dedicated backup path protection based on the efficient energy calculation and resource availability. Traditional First-Fit and Best-Fit schemes are employed to search and assign the available spectrum resources. The simulation results show that HybPL presents better performance in terms of blocking probability, compared with the Minimum Resources Utilization Dedicated Protection (MRU-DP) algorithm which offers better performance than the Dedicated Protection (DP) algorithm.

5. Conclusions

In this paper, the focus was put on the protection problem in elastic optical networks with the objectives of minimizing the resources used on the network with a low blocking probability. Two approaches were proposed for connection protection: the first one with dedicated and the other one with sharing backup resource. For primary and backup path computation, paths that use less power consumption and have more resources were selected. For the resource allocation, the traditional mechanisms “First Fit or Best Fit” were used to identify and select the available resources under the constraint of spectrum contiguity and continuity. In addition, the blocking probability of HybPL was compared to the Shared Backup Path Protection SBPPFR approach. The network performance was evaluated with the present HybPL, MRU-DP and the DP algorithms. The evaluation results show that our HybPL approach provides a lower blocking probability and better resource utilization on the network.