Modeling User Cooperation Problem in Mobile Overlay Multicast as a Multi-Agent System

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Executive Summary

The growth in broadband access and increases in terminal capability have enabled the authors to provide large-scale multimedia services. The traditional unicast architecture cannot support such a service because the transportation from a content server to many end hosts causes the overload to a content server. Overlay multicast techniques have been proposed to solve this problem. This high-layer technology allows them to provide largescale multicast services even for mobile networks. Also, the recent rapid growth of mobile broadband brought the large-scale mobile multicast services into reality. However, stream relays by users are indispensable in overlay multicast. Moreover, in mobile environments, users' willingness to relay depends on user states such as remaining battery charge, movement conditions, and the relationship with the relay requestor.

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