Reseach Of Audio & Video Communication System Based On P2P Network

At the present time, Audio & Video Communication (AVC) systems are widely used and become more important in people's life. But most systems are designed based on C/S model, in which the Server should perform all the tasks, they cause the Server a heavy burden, and server became the main bottle-neck of systems. The emergence of P2P brings a feasible solution to the problem. According to the technical features of P2P, problems of the research on P2P and application of it mainly concentrate on the Overlay network. So how to design an outstanding P2P Overlay network model is the last problem of the thesis.So the thesis designs a hierarchical & topology-aware network model and relevant algorithm based on the Kademlia network. The improvement mainly focuses on the two prevalent issues about the current structural P2P network: logical network mismatch with the physical one and node's heterogeneity.The thesis introduces SuperNode and zone concept in the model. The SuperNode is acted by the node which has strong integrated performance; the zone has one SuperNode and some NormalNodes which have similar distance from the SuperNode of the zone, so to achieve the purpose of the match with physical network and node's heterogeneity. When the NormalNode query resources, it queries them in the zone firstly, if if failed, then it queries them in other zones through the SuperNode of the zone. In the end, the thesis not only simulate and analysis its performance through P2PSim simulator, the simulative results demonstrate that the performance of improved model is better than the Kademlia network model, but also design and realize an AVC system to validate its practical feasibility, which has some basic functions.