One of the essential problems in unstructured peer-to-peer (P2P) network is enhancing the efficiency of resource retrieval. Previous researches either have poor response speed, or generate too much network overhead. In order to reduce the traffic load and improve the availability of the sharing resources in unstructured P2P networks, a key-peers based topology control mechanism is presented in this paper. Due to inherent heterogeneity of peers in P2P network, a few peers (called key-peers) directly affect the connectivity of P2P overlay topology. Therefore, it is particularly important to expl...
