Unidirectional Sonet / Wdm Ring In Dynamic Multicast Traffic Grooming

Wavelength division multiplexing (WDM) is becoming the dominant technology in backbone networks, enabling an optical fiber to carry more than one wavelength simultaneously. Since most of these applications require sub-wavelength bandwidth, some streams are usually groomed onto the same wavelength. By efficiently grooming low-speed traffic streams onto high-capacity optical channels, it is possible to minimize this electronic processing and eventually increase the network performance. Traffic grooming is an emerging topic that has been gaining more research and commercial attention.Many new applications in high-performance networks are of the multicast traffic type. Generally multicast sessions now tend to exhibit a dynamic nature. Recent research works on dynamic multicast traffic grooming in WDM mesh networks are reviewed. Techniques for dynamic routing and session provisioning of multicast sessions are compared and discussed.In this paper, we study the problem of efficient dynamically grooming of non-uniform multicast traffic demands on a unidirectional SONET/WDM ring. The characteristics of a unidirectional SONET/WDM ring are discussed. A new dynamic multicast traffic grooming algorithm (DMTGA) for unidirectional SONET/WDM ring based on a new auxiliary graph model is presented, whose objective is to minimize session blocking probabilities and average logical-hops. Through extensive simulations, we find that DMTGA has much better performance than MDTGA under not very heavy network load. Some future research directions of this issue are also presented.