Abstract
AbstractTo implement seamless mobility inside an integrated, multiple (e.g., GPRS/WiFi) access system, a vertical handover policy has to be devised. This is usually done at the mobile terminal, allowing it to be customized from an end‐user's perspective, in order to fit individual needs/preferences. We propose a new approach in taking vertical handover decisions, which are not anymore exclusively based on the knowledge of the available access networks' characteristics but also on higher level parameters which fall in the transport and application layers. To this extent, in this paper a model has been realized and simulations have been run in order to evaluate the impact of the vertical handover and its frequency on a set of typical user's network applications/services. We also take into account the user preferences in terms of cost and quality of service. We believe this approach reflects the optimal settings from the user's point of view with regard to his running services and applications. Our aim is to understand how to define a metric to be used in order to devise a solution which should try to balance the overall cost of vertical handovers with the actual benefits they bring to actual user's networking needs. This way, each mobile user could autonomously apply the handover decision policy, which is more convenient to his specific needs. Copyright © 2005 John Wiley & Sons, Ltd.
Highlights
The Fourth Generation (4G) networks concept supports wide-band data and telecom services for mobile users roaming across multiple, wireless and wired, integrated access networks
We propose a new approach in taking vertical handover decisions, which are not anymore exclusively based on the knowledge of the available access networks ’ characteristics and on higher level parameters which fall in the transport and application layers
We proposed a new approach in designing vertical handover algorithms, which is not aimed at optimizing resource usage of the two integrated access network from their administrators’ point of view, but should try to balance, from the end-user point of view, the overall cost of vertical handovers with the actual benefits they bring to his actual networking needs
Summary
The Fourth Generation (4G) networks concept supports wide-band data and telecom services for mobile users roaming across multiple, wireless and wired, integrated access networks. The purpose is that of combining all the existing heterogeneous wireless networks into a single, interoperable system, being IP protocol the ‘glue’ between the set of underlying radio access and physical layers. Within this overall scenario, it is foreseeable that many access technologies, even with very diverse profiles (in terms of bandwidth, latency, security, etc.) will often be available in overlapping areas. D. MODICA between the available access networks, which affect the overall performance of application sessions running on the mobile user’s device. The handover latency may heavily affect the continuity of application sessions (let us think about the strong delay requirements imposed by real-time applications)
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