A Market-Managed Topology Formation Algorithm for Peer-to-Peer File Sharing Networks

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Idris, Tarik; Altmann, Jorn
Issue Date
ICQT2006, Workshop on Advanced Internet Charging and QoS Technologies, St. Malo, June 2006
Incentive SchemePricingPeer-to-Peer NetworksSimulationMarket-ManagementTrustReputationEconomicsUtility Function
Currently, peer-to-peer (P2P) networks suffer from users that do not
contribute any kind of resources to the P2P community. Those users, which are
called freeriders, benefit largely from contributions of other users but reduce the
system performance for contributing users. This paper proposes an incentive
scheme for P2P networks that motivates users to collaborate within the system.
The solution that we propose has an impact on the topology formation of a
P2P network. Using our market-managed topology formation algorithm
(IUTopForm) for P2P networks, contributing users will be clustered within
clubs that are different to clubs of freeriders. The differentiation is possible
because of a reputation system, which considers users’ past contributions. The
effect of this approach is that service requests of freeriders will take longer to
be answered (if at all) than service requests of resource-contributing users. We
illustrate this effect through measurements with our P2P network simulator. We
also show that clubs are only interconnected if the difference in their reputation
values is not large. The comparison with Bagla and Kapalia’s approach, which
inspired our work, shows that the IUTopForm approach improves the overall
utility of the system. The utility function and the topology formation algorithm
are described in detail within this paper.
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College of Engineering/Engineering Practice School (공과대학/대학원)Program in Technology, Management, Economics and Policy (협동과정-기술·경영·경제·정책전공)Others_협동과정-기술·경영·경제·정책전공
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