Research and Impl of ALM-Tree Maintenance Policy Based on Peercast

Application level multicast becomes an effective solution for live media streaming nowadays. Tree based ALM solution suitable for large-scale streaming is simple to construct and easy to maintain but weak in reliability. In this paper, with the study on peers stability and distance evaluation, we proposed a new tree-topology maintain policy based on peercast, design and implement a peer-to-peer streaming system with this policy. Application shows that this algorithm works fine and can greatly deduce the influence on QoS when peers joining/leaving.