MDC-RSA: A novel online survivable RSA technique in data center oriented EON

Huge demand of high bandwidth applications nowadays necessitates the use of data centers (DC) as storage house at the nodes of Elastic optical networks (EON). Huge cost associated with DC limits its usage to some of the nodes in the network. Proper placement of these DCs as well as the requested files residing in these DCs has also crucial importance on network performance such as survivability and provisioning of online requests. In this paper, we propose a novel routing and spectrum allocation (RSA) scheme for dynamic requests in EON when minimum number of DCs are placed in proper positions to maintain survivability which results in reducing spectrum utilization as well as blocking probability. We have formulated an ILP and a heuristic DC-PL for placement of DCs in EON which is followed by another heuristic MDC-RSA to find out route and allocate spectrum for dynamic requests in survivable EON. Outcome of MDC-RSA is analyzed by varying different parameters such as subcarrier capacity, distance-adaptivity/(non-adaptivity), best fit/(first fit) approach and optical reach.