the ATM-based lub transport and the defined QoS target of dimensioning is the end user application performance, i.e. the application delay or throughput. The dimensioning for HSPA is presented in detail in Appendix A.15. The dimensioning and investigations are based on extensive simulations using the developed HSPA simulation models (details of the HSPA simulation models are given in section 5.6 and Appendix A. 10). In Appendix A.15 (I), a general framework is proposed for dimensioning of the lub interface for HSPA traffic. This framework determines several important factors that will have impact on the bandwidth dimensioning for the lub interface, such as the user applications and the traffic models, the available cell capacity and the number of UEs within one cell, the decision of the air interface scheduler, and the required QoS targets. Appendix A.15 (II) presents the detailed dimensioning results using HSUPA as an example, which have been published in [LZW*08]. The presented results consist of the investigations of the influence of different traffic models and the number of users on the obtained performance as well on the lub dimensioning, and furthermore the impact of QoS targets on the lub bandwidth dimensioning. From the presented dimensioning results obtained from the simulations, it can be concluded that the dimensioned lub bandwidth is strongly dependent on the QoS target, and more importantly on the aggregated lub traffic characteristic which is an outcome of the HSPA air interface scheduling influenced by the number of HSPA users in the cell and the traffic demand of each UE. 6 Dimensioning for Single ATM-Based lub Appendix A.16 presents the investigations of applying traffic separation approach to transport HSPA (HSDPA/HSUPA) traffic together with the Rel99 traffic over the same ATM- based lub interface. The concept of traffic separation in the ATM-based UTRAN is to apply separate ATM Virtual Path (VPs) or Virtual Circuits (VCs) with different ATM QoS categories to transmit different types of traffi