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

TL;DR

This paper analyzes various prefetching strategies in P2P VoD systems, introduces a new cooperative prefetching method called 'cooching', and demonstrates its superior performance through extensive simulations.

Contribution

It provides an analytical framework for understanding prefetching tradeoffs and proposes a novel cooperative prefetching strategy tailored for VCR-oriented P2P VoD systems.

Findings

Cooching outperforms existing prefetching strategies in simulations.

Analysis reveals key tradeoffs in prefetching strategies.

Prefetching segments based on gossip improves VCR support.

Abstract

Most P2P VoD schemes focused on service architectures and overlays optimization without considering segments rarity and the performance of prefetching strategies. As a result, they cannot better support VCRoriented service in heterogeneous environment having clients using free VCR controls. Despite the remarkable popularity in VoD systems, there exist no prior work that studies the performance gap between different prefetching strategies. In this paper, we analyze and understand the performance of different prefetching strategies. Our analytical characterization brings us not only a better understanding of several fundamental tradeoffs in prefetching strategies, but also important insights on the design of P2P VoD system. 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 session beforehand using the information collected through gossips. We evaluate our strategy through extensive simulations. The results indicate that the proposed strategy outperforms the existing prefetching mechanisms.