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通过网络测量破解流媒体视频软件PPStream(PPS)直播系统的缓存结构和共享机制发现,与软件PPIive(PPL)滑动的共享窗口不同,PPS具有跳跃的共享窗口.利用“窗口跳跃模型”分析了PPS的共享机制对节点间互惠关系的影响,发现跳跃的共享窗口将造成节点相位波动.根据该相位波动特征建立模型来描述处于不同相位的人数.数值评估与系统仿真结果表明,该模型能很好地反映带宽资源争抢造成节点相位波动的特征,有利于进一步完善系统的带宽分配策略,以保证节点的播放进度.
Through the network measurement, the PPStream (PPS) live streaming system caching structure and sharing mechanism was found out, which is different from the shared PPL (PPL) sliding window. PPS has a jump shared window. Using the Window Jump Model The influence of sharing mechanism of PPS on the reciprocal relationship between nodes is found, and the hopping shared window will cause node phase fluctuation. According to the phase fluctuation feature, a model is established to describe the number of people in different phases. Numerical evaluation and system simulation show that the model can It can well reflect the characteristics of node phase fluctuation caused by the competition of bandwidth resources, which is beneficial to further improve the bandwidth allocation strategy of the system and ensure the node playback progress.