Access network selection based on fuzzy logic and genetic algorithms
Advances in Artificial Intelligence
An Adaptive Threshold Load Balancing Scheme for the End-to-End Reconfigurable System
Wireless Personal Communications: An International Journal
Cost-based vertical handover decision algorithm for WWAN/WLAN integrated networks
EURASIP Journal on Wireless Communications and Networking
Vertical handoff decision strategy in wireless overlay networks
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
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The main challenge in the development of future wireless communication systems is to provide users with a wide range of services across different radio access technologies through a single mobile terminal, while maintaining the minimum QoS requirements, and ideally with no limits on the coverage area, mobility or radio conditions. Thus, the need for seamless interworking between heterogeneous wireless communication systems consisting of multiple radio access technologies and overlapping networks emerges. In this article we address the main issues that arise while implementing the interoperability mechanisms between two different radio access networks, with emphasis on UMTS-HSDPA and WLAN (HIPERLAN/2). Two interoperability mechanisms are introduced and described in detail: initial user assignment (optimal network selection) and intersystem handover. Both mechanisms are activated via the optimization of a suitably defined cost function which takes into account all the appropriate system level parameters that trigger the interoperability process. Finally, we investigate the overall performance of the proposed mechanisms by means of a software simulation platform. A number of simulations have been carried out in order to demonstrate the performance enhancements achieved by the proposed mechanisms in terms of unsatisfied users, dropped handovers, and system throughput.