Meta-heuristic procedure for enhanced spectrum fragmentation assessment in elastic optical networks

Clayton Lira,Raul Almeida Jr,Karcius Assis,Daniel Chaves,Helio Waldman

doi:10.14209/jcis.2020.33

Abstract

This work proposes the use of a procedure for improving the loss of capacity assessment of heterogeneous bandwidth requests in the min slot-continuity capacity loss (MSCL) spectrum allocation algorithm. The particle swarm optimization (PSO) method is used to determine the best relationship between the number of requested slots and the amount of contiguous free slots in the requested and interfering paths. We also incorporate in the MSCL the influence of the number of hops of a route in its capacity evaluation. Considerable reductions in the path request blocking probability are achieved when the technique is applied, particularly when the number of hops is included to the evaluation.

Highlights

The growing demand for bandwidth experienced by transport networks in recent years has been driven by the improved access to the Internet and by new video distribution applications, social networks, data centers services, among others
We propose two heuristics to solve the problem of spectrum assignment in elastic optical networks: min slot-continuity capacity loss (MSCL)-W and MSCL-WL
The heuristics are designed to improve the evaluation of the network loss of capacity of heterogeneousbandwidth demands as originally proposed by the MSCL

Summary

Introduction

The growing demand for bandwidth experienced by transport networks in recent years has been driven by the improved access to the Internet and by new video distribution applications, social networks, data centers services, among others. Optical communication networks have been the preferred technology to support this increasing necessity for bandwidth These networks have used, in the last decades, the concept of wavelength division multiplexing (WDM), which causes several fixed-bandwidth connections that can together boost the link capacity to few Tbps [1]. Elastic optical networks (EONs) have been proposed as a promising candidate for appropriately supporting high and adaptive transmission rates in optical transport networks. In such networks, the optical frequency spectrum is divided into narrow-width slots and any sequence of contiguous, available slots on all the links of a chosen route may be assigned to the connection. EONs can provide variable-bandwidth optical paths that can properly

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