Exploiting peer´s location information for improving routing and throughput performance in DHT systems

Ignoring the physical relationship between two peers, traditional structured Peer-to-Peer (P2P) systems, whose peers are arranged in a logical ring according to Distributed Hash Table (DHT), have some defects on delay and bandwidth for physical neighbor peers. We proposed a layered network structure to make full use of the location information of each peer. In this structure, all peers are separated into several groups according to their location information indicated by Hilbert ID. The super-node, one peer elected in each group, forms the higher layer and administrates other peers in the same group by using the load-status table. Based on this system model, the Location-aware Chord Routing (LCR) protocol and the Location-aware P2P Caching (LPC) strategy are proposed to improve system´s performance. Simulation results show the LCR could reduce the hops of routing and save routing distance while the LPC has remarkable performance at lowering the drop-rate of access request and improving the system throughput.