| Multicasting has emerged as one of the essential features in current and future networks with the development of computer and communication applications. Multicasting applications require supports of high bandwidth. A good transporting ability of Wavelength Division Multiplexing meets the demand of the multicasting applications.Therefore, the study of multicast in the WDM optical network becomes popular nowadays.Network design can be formulated as an optimization problem where total cost is minimized subject to topology, demand, and performance constraints. But by this method, it is hard to design a backbone network which can support current and future traffic matrics. The idea of robustness was used to design a network which can meet the requirements of variable traffic. A robust design method is the use of Valiant load balace for backbone design.The idea of using Valiant load-balance to realize multicast has been studied and a new multicast scheme for the WDM network has been proposed, based on Valiant load-balance.Using the method of traffic division and multiple paths, two multicast algorithms have been proposed to achieve load balancing on virtual topology. When some virtual links cut on the networks, we employ multiple paths which are one of the characteristics of Valiant load balance to protect multicast traffic.The two proposed multicast algorithms have been compared with the multicasting algorithms based on light tree in the case of dynamic traffic.Using different multicasting algorithms, the taffic on virtual link for a series of traffic matrics that satisfy the constraint and the traffic blocking rate of dynamic sessions have been calculated. The simulation results prove that the theoretic capacity of virtual link is currect and show that a full mesh network which has the theoretic capacity can guarantee any traffic matrix that saticsfies the constraint, and the multicasting scheme based on Valint load balance applies to dynamic traffic and has strong viability. |
PDF Full Text Request