一种基于优先级区分的视频流传输控制算法

A Video Stream Transmission Control Algorithm Based on Priority Differentiation

视频流传输控制对于提高网络服务质量具有重要意义。分析了MPEG视频流编码和传输特性,通过引入流间优先级和流内优先级机制,提出了一种基于优先级区分的视频流传输控制算法(PDVT),对不同类型的帧标记上不同的优先级,并进行优先级区分的调度。采用流间优先级机制区分MPEG流和其它网络流量,采用流内优先级机制区分MPEG视频流中不同类型帧的优先级。仿真实验表明,提出的PDVT算法能够向不同优先级流提供区分服务,大大提高了视频流传输质量,从而验证了算法的有效性。

Video stream transmission control mechanism is very important to improve quality of service of internet.Video codec and transmission characteristics are analyzed,and inter-flow and intra-flow priority differentiation mechanisms are introduced.Then,a priority differentiation-based video stream transmission control algorithm（PDVT） is proposed.Different kind of video frame is marked with different priority and is schedured according to its priority.Inter-flow priority mechanism distinguishes MPEG stream and other streams,while intra-flow priority mechanism distinguishes different kinds of MPEG frame in a video stream.Simulation results show that the proposed algorithm PDVT can provide differentiated service for flows with different priority and can improve video transmission quality greatly.