Aplicação de sistemas baseados em regras fuzzy para o roteamento em redes ópticas

Abstract

In an optical network without wavelength conversion, a connection between two nodes depends on the determination of the possible routes and the available wavelengths. The route selection is an important issue since it has a great influence in the use of resources, and consequently the network performance. Generally only the number of hops has been used as a criterion to choose a route. However, the use of additional criteria, provided they are properly combined, can lead to an improvement of the network performance. In this work we have investigated the use of fuzzy logic in the routing process of optical networks. A discrete-event simulator was used to analyse the performance of optical networks using a rule-based fuzzy system combining the number of hops and the number of available wavelength during a connection request. We have analysed two different network topologies: a mesh torus regular network with 16 nodes and 32 bidirectional links and a mesh irregular network with 14 nodes and 20 bidirectional links. Blocking probability and network resource utilization were used as metrics to our analyses.