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Architecture for Cooperative Prefetching in P2P Video-on- Demand System

Author(s): Ubaid Abbasi | Toufik Ahmed

Journal: International journal of Computer Networks & Communications
ISSN 0975-2293

Volume: 2;
Issue: 3;
Start page: 126;
Date: 2010;
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Keywords: P2P Network | Video on Demand (VoD) | Data Prefetching | Quality of Service (QoS).

Most P2P VoD schemes focused on service architectures and overlays optimization without consideringsegments rarity and the performance of prefetching strategies. As a result, they cannot better support VCRorientedservice in heterogeneous environment having clients using free VCR controls. Despite theremarkable popularity in VoD systems, there exist no prior work that studies the performance gap betweendifferent prefetching strategies. In this paper, we analyze and understand the performance of differentprefetching strategies. Our analytical characterization brings us not only a better understanding of severalfundamental tradeoffs in prefetching strategies, but also important insights on the design of P2P VoDsystem. On the basis of this analysis, we finally proposed a cooperative prefetching strategy called“cooching”. In this strategy, the requested segments in VCR interactivities are prefetched into sessionbeforehand using the information collected through gossips. We evaluate our strategy through extensivesimulations. The results indicate that the proposed strategy outperforms the existing prefetchingmechanisms.
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