A distributed routing and wavelength assignment algorithm for real-time multicast in WDM networks

Routing and wavelength assignment for online real-time multicast connection setup is difficult due to the dynamic change of availabilities of wavelengths on links and the consideration of wavelength conversion delay in WDM networks. This paper presents a distributed routing and wavelength assignment algorithm for the setup of real-time multicast connections. It integrates routing and wavelength assignment as a single process, which greatly reduces the connection setup fine. The multicast routing algorithm is based on Prim´s MST (minimum spanning tree) algorithm and K-restricted breadth-first search method, which can produce a subminimal cost tree under a given delay bound. The wavelength assignment uses least-conversion and load balancing strategies