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In UMTS networks, HSDPA users share radio resources like transmit power and OSVF codes with QoS-users, which use dedicated channels as primary transport method. Several options for the resource allocation for HSDPA exist, which center around the question whether resources should be exclusively reserved for HSDPA, or whether the resources for the HSDPA should be adapted to the requirements of the QoS users. We investigate the impact of three radio resource allocation schemes on the HSDPA and on the dedicated channel performance by means of a time-dynamic simulation. The numerical results show the trade-offs between dedicated channel and HSDPA performance and the sensitivity of the system against power and code reservation parameters.