Load balancing, multipath routing and adaptive modulation with traffic grooming in elastic optical networks

Abstract

Traffic grooming (TG) has been proposed in two ways as electrical and optical grooming to efficiently utilize spectrum and transponders due to omitting guard bands between adjacent lightpaths and establishing multiple independent lightpaths with the same sliceable bandwidth variable transponder (SBVT) in Elastic Optical Networks (EON). In this paper, cooperation of electrical and optical TG is developed as minimized utilization of spectrum or transponder using integer linear programming (ILP) model under static traffic scenario and our proposed corresponding heuristic LMAG algorithm. Electrical and optical grooming are coordinated with each other to construct an auxiliary graph (AG) and establish connection requests under dynamic traffic scenario using the LMAG algorithm. The multipath routing (MR) as an effective defragmentation method, adaptive modulation as effective technique in reducing bandwidth requirement of connection request, and load balancing as an appropriate routing method are employed in AG construction with coordination of electrical and optical TG. Various traffic grooming policies (TGP) by properly adjusting the edge weights are proposed to achieve significant performance improvements in blocking ratio (BR), spectrum and transponder (TP) utilization, and energy consumption in EON.