Seamless connection for mobile P2P and conventional wireless network

Recently, with the expansion and advent of the wireless internet such as WiFi, mobile WiMax, and mobile peer-to-peer (P2P) voice over IP (VoIP) communication through P2P overlay network in all-IP area has been deeply investigated as a research area. When the connected peer terminal leaves hot spot of all-IP area, it will be lost the communication session. In this paper, we propose seamless voice connection over P2P mobile VoIP and conventional wireless network. In this case, the concept of vertical handoff is not the handoff of IP layer but that of session layer to create new VoIP session in latency before the previous session ends. We have two kind of wireless communication network; one is all-IP and the other is CDMA cellular and assumes that the mobile node has the functionality to communicate with each other network. We certain the dynamically adjusted trigger method is better than the fixed trigger in the success of new call setup processing and the decrease of unnecessary signaling in cellular network. We think that this work is able to achieve seamless and low-cost communication between P2P VoIP and cellular network.