Abstract
The introduction of elastic optical networks (EONs) leads to new challenges, such as the problem of routing, modulation level, and spectrum assignment. In the literature, the best among the shortest routes (BSR) algorithm was proposed as fixed and fixed-alternate routing for EONs, but without considering physical impairments. Therefore, call requests were handled not taking into account the different bandwidth requirements as well as the impact on the optical signal quality of transmission when different modulation levels are considered. This is the first study to undertake heuristics based on BSR algorithm considering a fixed-alternate routing approach jointly with physical layer constraints in EONs. In order to assess the effectiveness of the proposed BSR heuristics in this paper, a genetic and a particle swarm optimization algorithms were also proposed. The results obtained by numerical simulations in different network physical topologies available in the literature show the effectiveness of our proposals in reducing the blocking probability of call requests in comparison with the traditional Yen algorithm.
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Real-World Reference Networks, http://www.av.it.pt/anp/on/refnet2.html.
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The authors thank to CAPES and CNPq for scholarships and grants, and to UFPE, UFRB, UFCG and UFBA for their educational support.
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Alves, M.M., Almeida, R.C., dos Santos, A.F. et al. Impairment-aware fixed-alternate BSR routing heuristics applied to elastic optical networks. J Supercomput 77, 1475–1501 (2021). https://doi.org/10.1007/s11227-020-03314-x
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DOI: https://doi.org/10.1007/s11227-020-03314-x