A novel multicast grooming scheme for dynamic QoS provision over OLS networks

Optical label switching (OLS) is a promising technology as it provides huge capacity and high transparency while supporting various granularities including packet and burst. Currently, OLS technology can assure unicast, grooming and QoS support. However, the important concern is to offer different QoS demands by providing a resource control of OLS networks allocation and utilization since these criteria can affect network design and performance. A better performance can be achieved by enabling data integration using multicast and grooming with respect to variable traffic constraints. Nevertheless, a suitable design can be reached by building optimal light-tree that decrease resource usage and improve resource availability. In this paper, we proposed a novel multicast grooming scheme which uses an upgraded core node that activates jointly unicast and multicast. The proposed node architecture also enables grooming by managing the optical resource, in terms of fiber delay line (FDL) and wavelength bandwidth, and traffic constraints using a new label framework. Moreover, advanced signaling and switching schemes are introduced for better lightpaths supervision and dynamic QoS support based on traffic loss and delay. Finally, simulation experiments are conducted to validate our proposal and evaluate its performance and efficiency.