Multicast Routing and Wavelength Assignment for Capacity Improvement in Wavelength Division Multiplexing Networks

In WDM network, the route decision and wavelength assignment of light-path connections are based mainly on the routing and wavelength assignment (RWA). The multicast routing and wavelength assignment (MC-RWA) problem is for maximizing the number of multicast groups admitted or for minimizing the call blocking probability. In this paper, The design of multicast routing and wavelength assignment technique for capacity improvement in wavelength division multiplexing (WDM) networks is proposed. In this technique, the incoming traffic is sent from the multicast source to a set of intermediate junction nodes and then, from the junction nodes to the final destinations. The traffic is distributed to the junction nodes in predetermined proportions that depend on the capacities of intermediate nodes. Then, paths from source node to each of the destination nodes and the potential paths are divided into fragments by the junction nodes and these junction nodes have the wavelength conversion capability. By using the concept of fragmentation and grouping, the proposed scheme can be generally applied for the wavelength assignment of multicast in WDM network. By simulation results, it is proved that the proposed technique achieves higher throughput and bandwidth utilization with reduced delay.