A novel auxiliary graph model for effective dynamic traffic grooming in light-trail optical WDM mesh networks

Abstract

A light trail is a unidirectional bus from a convener node to an end node. The main advantage of a light trail over a light path is that the communication channel of a light trail can be accessed by intermediate nodes providing more flexibility for traffic grooming. Several auxiliary graph models have been developed in the literature for traffic grooming in light-trail optical WDM mesh networks. These auxiliary graph models have one or more drawbacks that do not fully reflect the characteristics of a light trail. This paper develops a novel auxiliary graph model that has none of the drawbacks and is able to reflect all characteristics of a light trail. Based on the auxiliary graph model, two effective dynamic traffic grooming algorithms are proposed. The proposed dynamic traffic grooming algorithms are shown to yield low request blocking ratio.