Abstract. We propose a workload balancing based approach to discourage free riding in Peer-to-Peer (P2P) network. The heart of our mechanism is to migrate some shared files from the overloaded peers to the neighbored free riders automatically and transparently, which enforces free riders to offer services when altruistic peers are heavily overloaded. The implementation techniques are discussed in detail. We design a simulation to verify this approach, and the results show that it can not only decrease the degree of free riding, but also improve the Quality of Service (QoS) and robustness of P2P network efficiently.
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