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Several radio access technologies are now likely to coexist in the same area, and form the so-called heterogeneous wireless networks. In this paper, the authors study the coordination between WiMAX and WiFi through Radio Resource Management (RRM) in order to maximize the network operator's revenue. Two solutions for the optimization problem, in which vertical handover and admission control are invoked respectively, are suggested and compared. The simulation results indicate that, through their methods, the network revenue could be greatly increased without seriously degrading the user experience in terms of call-average throughput.
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