Push popular segments in P2P VoD system: possibility and design

  • Authors:
  • Junfeng Xie;Edward Chan;Guihai Chen;Yang Guo

  • Affiliations:
  • State Key Laboratory for Novel Software Technology, Nanjing University, Nanjing, P. R. China;Department of Computer Science, City University of Hong Kong, Kowloon, Hong Kong;State Key Laboratory for Novel Software Technology, Nanjing University, Nanjing, P. R. China;Corporate Research, Thomson, Princeton, NJ

  • Venue:
  • ICC'09 Proceedings of the 2009 IEEE international conference on Communications
  • Year:
  • 2009

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Abstract

Video-on-Demand (VoD) services have attracted a lot of attentions in recent years. Measurement studies show that VCR (Video Cassette Recorder) operations, such as pause, rewind, and fast forward/backward, influence the pattern of the access to video segments and viewer(session) sojourn time. Moreover, some VCR features (e.g., bookmarking [1]) newly proposed can further magnify such effects. This work analyzes the possibility to discern popular segments (highlights) from normal non-popular segments (normal-content) and how to reduce playback jitter in P2P streaming by leveraging this difference in segment popularity. Our contributions are two folds. First, a user playback model is presented, based on which we come to an affirmative conclusion on the possibility aforementioned. Besides, we also examine a real workload trace to validate the model and conclusions. Second, we propose a hybrid system, namely PITAPAT, which pro-actively Pushes out hIghlighTs And Pulls in normAl-contenT on demand. In order to reduce the playback jitter, the overlay topology is designed to provide a pull demand as many desired sessions as possible. The performance of PITAPAT is evaluated by using a queuing model and simulations, whose results show that PITAPAT outperforms the traditional mesh-pull based P2P system in terms of playback continuity.