The authors propose a novel method for transporting multi-view videos that aims to keep the bandwidth requirements on both end-users and servers as low as possible. The method is based on application layer multicast, ...The authors propose a novel method for transporting multi-view videos that aims to keep the bandwidth requirements on both end-users and servers as low as possible. The method is based on application layer multicast, where each end point re- ceives only a selected number of views required for rendering video from its current viewpoint at any given time. The set of selected videos changes in real time as the user’s viewpoint changes because of head or eye movements. Techniques for reducing the black-outs during fast viewpoint changes were investigated. The performance of the approach was studied through network experiments.展开更多
对OMA(open mobile alliance)提出的基于IMS(IP multimedia subsystem)平台的PoC(push to talk over cellular)服务器处的RTP(real-time transport protocol)媒体流转发机制进行了分析建模并进行了改进。新机制通过引入分布式控制的思...对OMA(open mobile alliance)提出的基于IMS(IP multimedia subsystem)平台的PoC(push to talk over cellular)服务器处的RTP(real-time transport protocol)媒体流转发机制进行了分析建模并进行了改进。新机制通过引入分布式控制的思想来增强参与服务器侧控制功能,将RTP流的转发操作提前到参与服务器处完成,达到了减轻控制服务器处瓶颈效应、平衡网络流量负载和优化数据传输时延的目的。分析和仿真结果表明新机制在平衡网络负载和优化数据传输时延方面较旧机制有明显的改进。展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.90104002 60303006(国家自然科学基金)the National Grand Fundamental Research 973 Program of China under Grant No.2003CB314801(国家重点基础研究发展规划(973))
基金Project (No. 511568) supported by the European Commissionwithin Framework Program 6 with the acronym 3DTV
文摘The authors propose a novel method for transporting multi-view videos that aims to keep the bandwidth requirements on both end-users and servers as low as possible. The method is based on application layer multicast, where each end point re- ceives only a selected number of views required for rendering video from its current viewpoint at any given time. The set of selected videos changes in real time as the user’s viewpoint changes because of head or eye movements. Techniques for reducing the black-outs during fast viewpoint changes were investigated. The performance of the approach was studied through network experiments.
文摘对OMA(open mobile alliance)提出的基于IMS(IP multimedia subsystem)平台的PoC(push to talk over cellular)服务器处的RTP(real-time transport protocol)媒体流转发机制进行了分析建模并进行了改进。新机制通过引入分布式控制的思想来增强参与服务器侧控制功能,将RTP流的转发操作提前到参与服务器处完成,达到了减轻控制服务器处瓶颈效应、平衡网络流量负载和优化数据传输时延的目的。分析和仿真结果表明新机制在平衡网络负载和优化数据传输时延方面较旧机制有明显的改进。
