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DSCH transport channel through suitable packet scheduling is the envisaged mechanism to deal with delay tolerant services in the downlink of UTRA-FDD. When operating in a mixed service scenario, where both real time and non real time traffic are present, different issues should be considered in order to guarantee some performance figures for both kinds of users. In particular, this paper shows the impact of the OVSF code tree size devoted to DSCH in terms of non real time services average packet delay. Besides, the consequences for real time traffic in terms of admission and dropping probabilities are also dealt. The completion of this research is the definition of a traffic mix region where some QoS figures are guaranteed and the corresponding DSCH dimensioning is devised.