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Over the last years the IP Multimedia Subsystem (IMS) has continuously gained in importance as the next generation communication network. The Session Initiation Protocol (SIP) was chosen the signaling protocol for session establishment and control in IMS. Losses caused by network or server overload would cause retransmissions and delays in the session establishment and would hence reduce the perceived...
Future wireless networks will allow users to seamlessly roam among heterogeneous wireless networks. To provide services anywhere and anytime in such a diverse networking environment, vertical handoff is still a crucial target. In this paper we propose non-real time services vertical handoff decision algorithm NRS-VDA. NRS-VDA is an intelligent vertical handoff decision algorithm that can manage efficient...
Measuring the capacity of the IP Multimedia Subsystem (IMS) controllers is very important due to the critical role it plays in the Next Generation Network (NGN) of the Fixed and Mobile Networks. This paper proposes a robust and scalable method that can be used to measure the capacity of the IMS controllers, Call Session Control Function (CSCF) and benchmark their different vendors. The purpose of...
In the future there is a need to provide seamless mobility to the heterogeneous wireless network user while on the move. To achieve this there is a need to design an efficient vertical handover mechanism. User preference and system condition should be taken into consideration for efficient vertical handover. As the 3GPP Long-term evolution or LTE is the upcoming WWAN technology, performing an efficient...
The vision of 4G network is to have a unified network of heterogeneous wireless networks. To achieve seamless mobility in such a diverse environment, vertical handoff is still a challenging problem. Traditional handoff mechanisms were based on the Received Signal Strength (RSS), but to have an efficient handoff decision in a heterogeneous network environment in addition to RSS other parameters, e...
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