PIM-SM protocol based architecture to transparent mobile sources in multicast mobile IPv6 diffusion

摘要

Internet research community has proposed many Different multicast routing protocols to support efficient multimedia application such as, IPTV, videoconferencing, group games. Nevertheless, these protocols have not been designed for mobile members and roaming sources, and has not been tested in wireless and mobile environment since they were developed for multicast parties whose members and sources are topologically stationary. Studying and solving multicast issues in the stationary multicast infrastructure has been largely studied in the literature. However, fewer efforts have been spent in the specific problems of mobile members and sources. The main problematic of the multicast IP protocols in a Mobile IP environment is the frequent change of membership and members location, especially, the scenario of handover where a mobile source moves from attachment point in one sub-network to another one in another sub-network is challenging. A multicast source is identified by its Home Address HA. Since IP mobility implies acquisition of a new topologically Care-of-Address CoA at each handoff resulting in a change of identity of the multicast source, however, the established multicast routing states are always based on the home address of the mobile source. The key idea of this work is to make the handover of multicast sources transparent and avoid the reconstruction of the entire multicast-based tree, by using an architecture based in PIM-SM multicast distribution trees to hide the mobility of a mobile multicast source from the main multicast delivery tree. Simulation results show that good performance is achieved in terms of handoff latency, end-to-end delay, tree construction delay and others metrics.