QoS-awareness peer coordination control for topology-converging P2P live streaming

For Peer to Peer (P2P) live streaming media, the peer coordination control mechanism becomes complex under dynamic traffic fluctuation, different node distance and capacity as well as user dynamics. Due to the lack of the adjusting ability, the existing peer coordination control mechanisms perform worse, and have large overhead. In order to overcome these problems, a QoS-awareness peer coordination control mechanism is proposed. Specifically, firstly, a ring buffer mechanism is introduced to implement the cyclic coordination, and the algorithms of both cycle length and cycle time are suggested to implement the constant startup delay and smooth play. Secondly, the selection algorithms of both the content-likeness candidate and the shortest-distance peer are proposed to implement the QoS-awareness streaming synchronization. Thirdly, the peer task assignment algorithm is proposed to implement the variable trunk and similar Cycle Task Fulfillment Time (CTFT). Next, a self-adaptive adjusting mechanism is introduced to converge P2P topology and fight against the delivery abnormality. Finally, simulation is conducted to corroborate our studies and the results show that its performance outperforms the existing mechanisms.