Fragmentation-Aware with core classification algorithms for spectrum allocation in Elastic Optical Networks-Space Division Multiplexing (SDM-EON)

Abstract

The new technology to improve the capacity of transmission in optical networks is Elastic Optical Networking with Space Division Multiplexing (SDM-EON). However, fragmentation is one of the critical issues in EON that is created by dynamically establishing and releasing lightpaths over the time, thus increasing connection blocking probability. In this research, two new algorithms are proposed in SDM-EON to improve the fragmentation problem and improve blocking probability, called Priority Select Frequency (P-S-F) and Priority Select Core (P-S-CO). We assume that connection demands have three priorities as high-priority, mid-priority, and low-priority. Here, the requested bandwidth of a connection demand is divided into smaller sizes to be setup in multiple cores. By providing this opportunity in spectrum allocation and assignment, connection blocking probability is reduced as our performance evaluation results prove. For instance, P-S-CO and P-S-F reduce bandwidth blocking probability, respectively, at least by 6.8% and 4.5% compared to existing methods. In the best case, P-S-CO and P-S-F can improve bandwidth blocking probability, respectively, by 25% and 17.8% compared to existing methods.