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Most P2P VoD schemes focused on service architectures and overlaysoptimization without considering segments rarity and the performance ofprefetching strategies. As a result, they cannot better support VCRorientedservice in heterogeneous environment having clients using free VCR controls.Despite the remarkable popularity in VoD systems, there exist no prior workthat studies the performance gap between different prefetching strategies. Inthis paper, we analyze and understand the performance of different prefetchingstrategies. Our analytical characterization brings us not only a betterunderstanding of several fundamental tradeoffs in prefetching strategies, butalso important insights on the design of P2P VoD system. On the basis of thisanalysis, we finally proposed a cooperative prefetching strategy called"cooching". In this strategy, the requested segments in VCR interactivities areprefetched into session beforehand using the information collected throughgossips. We evaluate our strategy through extensive simulations. The resultsindicate that the proposed strategy outperforms the existing prefetchingmechanisms.

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