北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2012, Vol. 35 ›› Issue (2): 72-76.doi: 10.13190/jbupt.201202.72.denggq

• 研究报告 • 上一篇    下一篇

P2P视频点播系统的服务质量模型

邓光青1,危婷1,陈常嘉1,朱巍2,王斌2,吴登荣2   

  1. 1. 北京交通大学 电子信息工程学院, 北京 100044; 2. 上海聚力传媒技术有限公司 技术研发部, 上海 201203
  • 收稿日期:2011-03-14 修回日期:2011-10-24 出版日期:2012-04-28 发布日期:2012-01-05
  • 通讯作者: 邓光青 E-mail:dgq2011@gmail.com
  • 作者简介:邓光青(1983-),男,博士生,E-mail:dgq2011@gmail.com 陈常嘉(1949-),男,教授,博士生导师
  • 基金资助:

    国家重点基础研究发展计划项目(2007CB307101);国家自然科学基金项目(60672069,60772043)

A QoS Model of P2P VoD Streaming System

DENG Guang-qing1, WEI Ting1, CHEN Chang-jia1, ZHU Wei2,WANG Bin2, WU Deng-rong2   

  1. 1. School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. Research and Development Department, Shanghai SynaCast Media Tech Company Limited, Shanghai 201203, China
  • Received:2011-03-14 Revised:2011-10-24 Online:2012-04-28 Published:2012-01-05

摘要:

为了分析下载速度的波动性对点对点(P2P)视频点播(VoD)系统服务质量的影响,提出了一个播放中断模型.由该模型可知下载速度的波动性是导致中断的主要原因,增加预取数据量和增大下载速度都能减小中断数,但前者使中断推迟发生,后者使中断提前发生. 在1次播放过程中,发生多次中断的现象是存在的,但其概率很小.通过对PPLive点播系统进行网络测量,验证了P2P点播系统中断的特性.

关键词: 点对点, 视频点播, 服务质量, 中断

Abstract:

To analyze the influence of the dynamics of download speed on performance of peer to peer (P2P) video on demand (VoD) streaming systems, a playback interruption model is presented. The model shows that the dynamics of download speed is the main reason of the playback interruption. Both increasing the prefetched content and the download speed can reduce the number of interruptions. However, the former delays the interruption, the latter brings forward the interruption. The interruption may happen frequently in the whole playback process, though with low probability. Through network measurement towards PPLive VoD system, the behavior of the interruption can be verified.

Key words: peer to peer, video on demand, quality of service, interruption

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