Adaptive Green Routing Mechanism over Optical Networks

This paper is an extension to the previous work that introduced the hybrid energy-aware and service level agreement (SLA) based routing mechanism over optical networks. This paper introduces an adaptive SLA-based routing approach to lower the Co2 emission rate while it provides the most available routes between any pair of source and destination. The paper benefits from the hybrid path cost function presented in the previous work in which Co2 emission rate, path length, and path availability are taken into account as the route selection process criteria. The mechanism proposed in this paper re-routes established optical paths using an adaptive green routing algorithm after the nodes in the network are informed of any changes on the emission factors of the links. As a result of employing the new energy-aware routing algorithm together with the novel path cost function, paths with the minimum Co2 emission and less assigned network resources will be selected. The algorithm presented in this paper keeps Co2 emission at the lowest level with maintaining an adaptive re-routing mechanism over the duration of connections while service level agreement requirements are still met.