P2P-TV流媒体系统鲁棒自适应速率控制算法及仿真

Robust Adaptive Rate Control Algorithm and Its Simulation for P2P-TV Streaming Media Systems

基于滑模控制(Sliding Mode Control, SMC)提出一种P2P-TV流媒体节点上行速率控制算法。该算法通过合理设计滑模控制器从而自适应控制同时连接邻居节点信号进程的数目,进而控制上行速率,达到系统资源的公平利用。由于滑模控制对于网络模型的不确定性、网络参数的时变性以及网络抖动具有较强的鲁棒性,采用该算法在网络条件变化时,避免了系统拥塞。仿真结果表明该方法可使队列长度快速收敛,同时队列振荡较小,从而可以使传输延时抖动维持在一个较小的范围内,使用户的感知质量有所改善。

A control algorithm proposed to control the upstream rate based on sliding mode control in P2P-TV streaming media node.Through the rational design of sliding mode controller,the algorithm can adaptively control the numbers of signaling threads between neighbor pairs connected simultaneously and then control the upload rate.Further,it can achieve the fair use of resources.Due to the sliding mode control has strong robust with modeling uncertainties,time varying parameter fluctuations and external disturbances,it can avoid the system congestion under network condition change.Simulation results demonstrate that it can lead to the convergence of the queue length to the desired value quickly and maintain the oscillation small.The results also show that it can maintain the transmission delay jitter in a smaller range and improve the user perceived quality of service.