关键词: 对等网, 网络坐标, 粒子群算法

Abstract: Location-aware is a key technology to reduce bandwidth waste which is a negative feature of P2P overlay network.The paper proposes a two-phase resolving method to improve the global convergence ability of network coordinates computation.This method first uses PSO on the initial solution set of a global optimization，then runs a local refinement in the vicinity of the global optimum to obtain the accurate network coordinates of each nodes.Through the two-step optimization，the depending on the remote landmarks is reduced and the applicable scope of the algorithm is increased.

Key words: P2P, network coordinates, Particle Swarm Optimization（PSO）