Abstract:

This paper studies characteristics and architecture of P2P streaming broadcast systems. Construction and design methods of multicast tree are first discussed. A scheme combining unicast and multicast trees is proposed, which combines advantages of easy maintenance of unicast tree and load balancing of multicast tree. Based on analyses of the strategies of node organization and timely service of new nodes, an optimized strategy for immediate service is introduced. When new nodes are added, the system will detect their abilities of providing services, and adjust the multicast tree structure to utilize the ability of the new nodes, thus enhance the system capacity.

Key words: P2P; streaming media; multicast tree