Research And Improvement Of Topology Mismatching On Chord

The research and application on peer-to-peer P2P is a hot spot in computer network field. The current P2P system can be separated in two types, one is non-structured P2P system, another is structured P2P system. Structured P2P system is based on the principle of DHT. In this paper, author proposes an improvement scheme of some issues of Chord, which is the representation of structured P2P system.Chord does not take into account the mismatching problem between logical network topology and physical network topology, which would cause inefficient routing. In this paper, a scheme based on IP address information of node is proposed, which can meet matching between logical network topology and physical network topology in a certain degree. In addition, a concept of localization of the resources index information depositing is presented, which is to solve the mismatching issue of the resources index information depositing. TChord system is based on the two structural improvements. Moreover, the paper explains the TChord system's design in detail, including routing strategy, the joining of new nodes and exiting of nodes. In the last, we make simulation experiment on the Chord and TChord systems. The result of experiments verifies that the TChord system, compared with Chord system, has obvious improvement on the delay of route and the hops of overlay networks.