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With the roll out of the Universal Mobile Telecommunications System in Europe the optimization of the capacity and the quality of service is becoming an issue. Therefore the task of the radio resource management to control these two aspects has become more important. This work deals with the effects of the admission control, which handles the acceptance of new calls. Since the UMTS specification leaves room for admission control algorithms, in this work three different admission control strategies have been extended, newly derived, and were implemented in a UMTS system-level software simulator. Using this simulator the effects of the admission control strategies are investigated in different scenarios, and the results are compared to the case disregarding radio resource management. The simulations show that all admission control strategies can decrease the number of dropped calls and overload situations. Therefore the quality of service is increased for the price of a smaller capacity. The best results are given by the newly derived interference based admission control.