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This study’s objective was to solve the problem that the structured P2P model was not appropriate for dynamic network. A self-adaptive dynamic P2P model of two-level is proposed. Super peers compose to a self-adaptive Distribute Hash Table network on the top layer, and lower ordinary peers take super peer in the same group as their center server to form a cluster. When super peer join or leave, it does not maintain the consistency of entire network’s logic topology. Only updating routing table of its predecessor and successor, super peers update their routing table cache when they transmit messages. The experimental results indicate that if k is average amount of peers in each group, then search in self-adaptive P2P model of two-level only brings 1/k hops compared to Chord of same net size. When peer join or leave it produce messages at constants level. The conclusion indicates that the model could be more applicable in ad hoc P2P network with high churn rate compared with Chord network.</p

Study of Two-level P2P Model on Self-adaptive Dynamic Network