Peer-to-Peer contents distribution system using multiple peer clusters

Peers search contents with information of contents such as keywords in many peer-to-peer contents sharing systems. In many peer-to-peer contents search architectures, queries are forwarded to peers which belong to clusters related with the keywords. Since clusters are basically constructed regardless of physical network topology, a peer receives contents from peers that are located far from the peer in some cases. To solve this problem, the authors proposed an architecture in which clusters were constructed on multiple logical layers. And furthermore, the authors verified effects of switching clusters.