A novel fragmentation-aware and energy-efficient multipath routing and spectrum allocation for prioritized traffic in protected EONs

Spectral fragmentation caused by frequent arrival and departure of random dynamic connections is a major area of concern, which may lead to block even some high prioritized dynamic connection requests in elastic optical network (EON). EONs supporting high bandwidth data traffic may also suffer from huge data loss even if a single link fails. To ensure survivability in elastic optical network, adequate redundancy of network elements is needed, which increases power consumption in the network. In this paper, we have addressed all these problems at a time and propose a novel fragmentation-aware and energy-efficient survivable routing and spectrum allocation scheme (P-EM-RSA) for prioritized traffic in dynamic EONs. Survivability is ensured by applying multipath based approach. By enabling high priority connections with high demand and maintaining survivability, this heuristic shows a remarkable reduction in bandwidth blocking ratio leading to improved spectrum occupation rate with reduced power consumption. Simulation experiments using two well-known topologies justify the result.