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Within this paper a simulation model of a hierarchical structure with three levels with different wireless systems is presented and investigated. The analysis is placed on a cellular level to better understand the user behavior. Modeled is a city environment, where the focus is made on the inter-system handovers between the different wireless systems and how they are affected by the change of different parameters. The results show that inter-system handovers will react differently dependent on what type of handover that is investigated. The results can be used to analyze the influence of mobility, as well as service demands. This can be an effective way to dimensioning cooperating wireless systems and to analyze the effect of introducing a new service or application.