| A new style of the network-i3 which is different from the traditional IP communication is now penetrating into our lifes. It changes the original communication process through an indirect communication structure to satisfy the growing networking need of mobility, security and multicast.i3 is a P2P network essentially which is a hot network structure these years and its applications emerge in endlessly. Especially it provides infinite storage space and unlimited transmission capacity which is not capable for the traditional center servers.Compared with the matured P2P network, i3 is still on research including Chord protocol, service composition etc.We do some research on the Chord protocol and service composition of i3 network:1.We systematically analyze every P2P searching algorithms include Gnutella, CAN and Chord. We introduce the Chord protocol in depth, compare it with others and show the advantages of it.2. Do some researches on the Chord protocol in i3 network. We improve the Chord protocol for the i3 and do some simulations in i3.The routing table of the classic Chord is 2-rank.We design a 3-rank Chord which can eliminate the transmitting times in the through increasing the entries of the routing table. According to experiments, we can find for a network, the elimination of the transmitting times means decreasing of the average time delay.3.Do some researches on the service composition, explain the concept of it and achieve it in the P2P network. Based on the i3 platform, we provide and analyse three service composition schemes for application and complete the service configuration of one scheme.4. Finally, we make a conclusion for chord algorithms under i3 network, analyse how to achieve the service composition schemes, and make a prospect for the future research. |