Research on Searching Scheme in P2P System Based on Semantic Overlay Network and the Small-world Theory

To improve the insufficiency of super-peer overlay network, an efficient, robust and expansible searching model, SSP2P, is put forward. The peers were organized into varied area autonomy system (AAS) according to their physical topology. Owing to heterogeneity, the peer with highest capability was selected as super-peer in each AAS. And super-peers were formed into many super-peer semantic overlay networks (SSN) based on semantic relationship. Thus a hierarchical P2P network was formed. Through the simulation on Neuogrid, the rationality and validity of model were proved. It has a higher recall, less messages, smaller response time and better expansibility than that in LimeWire