capacity and the lub congestion control function, and taking certain statistical assumption of UE channel conditions, other cell to own cell interference, and certain percentage of soft handover UEs. The following sections present the dimensioning results for HSUPA traffic, as an example. II. Dimensioning for HSUPA Traffic This section presents the dimensioning results of the lub interface for carrying HSUPA traffic obtained from simulations. The simulations are performed with the HSUPA simulation model (see Appendix A.10 II). The investigations consist of two parts: (1) the performance under different traffic models, number of HSUPA UEs and their impacts on the lub bandwidth dimensioning; (2) the estimation of the required lub bandwidth as a function of user QoS requirements. Traffic Models and Simulation Scenarios In the simulations, ftp application is chosen for HSUPA UEs. In order to investigate the impact of different traffic models on the lub dimensioning in HSUPA network, five ftp traffic models are used to generate a range of uplink traffic loads per HSUPA UE, as given in Table A.4. ftp traffic model II, as a reference model, is defined in 3GPP specification [3GP04f] which generates moderate uplink traffic. ftp traffic model I, III, IV and V are configured with different file sizes while keeping the same interarrival time distribution to produce various traffic load levels. Moreover, for investigating the influence of HSDPA traffic in downlink on the HSUPA performance, the ETSI defined web traffic model is used for HSDPA (Table 5.3). The main configuration parameters for the simulations are given in Table A.5. The CIRtarget VS. user data rates in the simulation are from [Mes06]. Following investigates the scenario of one HSUPA cell and assume a single traffic type used by all HSUPA UEs. The simulated network consists of one Node B and one RNC which are connected with each other via a single lub link. The simulations scenarios are categorized A.15 Dimensioning for HSPA Traffic upon the traffic models and t