Research Of Simulation-oriented Application Layer Multicast Protocol

With the development of computer network, Internet has been becoming an important part of the mean streaming of human being. People hope Internet could provide all kinds of network services the applications need. Especially, the emergence of many new multimedia group applications, such as video conferencing, video-on-demand and distance learning, require multicast communication service imminently.Recently as the development of P2P techniques, Application level multicast (ALM) based on P2P also known as end system multicast or overlay multicast has become a very popular research in many college and corporation. Compared with IP multicast, ALM is more flexible and deployable. But data delivery in ALM tree can be easily interrupted by departure of end hosts, which may lead to degradation of QOS in time sensitive applications such as live streaming.On the basis of the serious study on the existing application layer multicast protocol, this paper proposed a multi-level structure of the application layer multicast protocol as for the deficiencies in currently systems. Such protocol has a high efficiency and excellent scalability, mainly for real-time multimedia applications, to reduce the packet delay, ensuring that real-time data transmission of streaming media. The exactly research and specific work of thesis include the following:·The studies of application layer multicast system architecture. Analyzed and summarized of three popular application layer multicast system architecture, a stack model of application layer multicast system is proposed.·The research of application layer multicast protocol. We designed a new multicast protocol under careful analysis of the existing application layer multicast systems strengths and weaknesses. The protocol considerate the characteristics of the underlying network topology to avoid costly packets in the transmission link, thereby reducing the delay. At the same time, it adopts the multicast algorithm based on the Fibonacci sequence to realize group multicast. On the other hand a dynamic group management strategy is introduced, with a higher scalability.·The simulation of the protocol. Analyze the advantages of AED, ALS, ACS performance through the two different simulation experiments. The first simulation is about single-source case. The second simulation is about multi-source situation, in each case changes the number of multicast group members.