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In this paper, the authors revisit the problem of multicast tree construction in overlay peer-to-peer networks. They present an iterative online multicast tree construction algorithm for multisession multicasting of elastic content. Their framework allows receivers to request multiple sessions from possibly different servers. Each receiver expresses a quality-of-service requirement using a utility function. They propose an online algorithm which constructs multicast trees to maximize the overall receiver utility functions in an iterative fashion, allowing it to adapt to changes in network topology and cross-traffic.
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