支持变速率视频流传输的重协商优化算法  

The Optimized Algorithm Characterizing Renegotiation for VBR Video Flows

作　　者：张晓瑜[1] 钟玉琢[1] 杨品[1] 

机构地区：[1]清华大学计算机科学与技术系,北京100084

出　　处：《电子学报》2003年第5期683-686,共4页Acta Electronica Sinica

基　　金：国家自然科学基金 (No 60 2 730 0 8) ;973项目 (No G1 9990 32 70 4 )

摘　　要：针对变速率视频流在多个时间尺度上突发的性质 ,本文提出了基于多级整形和多时间尺度带宽分配与准入的重协商优化算法 .算法通过视频源与边缘网关的重协商过程 ,对进入网络的数据流进行包络 ,提高数据流的控制性和预测性 ,从而减少突发对网络所造成的破坏 ;并且对中小规模的数据流复合的情况 ,可以取得接近VBR流的复用增益 .Aiming at the devastating multiple time scale burstiness of VBR (Variable Bit Rate) video flows,an optimized algorithm characterizing renegotiation which is based on multilevel regulator and multiple time scale bandwidth allocation and flow admission is presented.Through the renegotiation between video source and edge node of the network,video flows are properly enveloped before entering the network.The proposed algorithm enhances the capability of control and prediction on video flows,which significantly attenuates the impact caused by burstiness on network.For small and moderate aggregated flows,it could attain a multiplexing gain approximating the gain of unrestricted VBR flows.

关 键 词：多时间尺度 流量控制 重协商 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]