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Realizing on-demand media streaming in a Peer-To-Peer (P2P) fashion is more challenging than in the case of live media streaming, since only peers with close-by media play progresses may help each other in obtaining the media content. The situation is further complicated if the authors wish to pursue low aggregated link cost in the transmission. In this paper, they present a new algorithmic perspective towards on-demand P2P streaming protocol design. While previous approaches employ streaming trees or passive neighbour reconciliation for media content distribution, they instead coordinate the streaming session as an auction where each peer participates locally by bidding for and selling media flows encoded with network coding.
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