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Along the growth of internet traffic, the penetration of internet access from mobile user has been increased. By augmenting mobile data traffic, the mobile network capacity limits have become significant issues. To cope with the increased mobile user data to cellular radio networks, several offload approaches such as femtocells have been proposed. With regard to 3G core network offload, Selected IP...
With the acceleration of network evolution to the packet-based all-IP network, a demand for the IMS which is defacto standard framework to provide IP services in the packet-based network, is increasing rapidly. Number Portability(NP) which has been contributing to facilitating of telephony company competition and increasing of user convenience in legacy circuit-based networks, is also becoming more...
Mobile VoIP based on IP Multimedia Subsystem (IMS) is one of the most issues according to introducing UTRAN long term evolution (LTE) networks. In addition to, there are many hot spot such as WLAN of free worldwide directory. In order to provide a mobile VoIP service over various networks, it is important to define VoIP architecture and provide interconnection at the service & media layer between...
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