consists of a Node B and a RNC with a single ATM link between them. The UEs downloads data from the remote Internet servers (i.e. data is transferred on downlink direction). The data is generated from either ftp or web applications (HTTP version 1.1). In the following, the amount of data per transaction is referred to as file sizes or page sizes. Various file or page sizes and the distributions were investigated (e.g. constant, heavy-tail Pareto, etc.). In all simulation scenarios, flows arrive according to a Poisson process, i.e. the interarrival times are negative exponentially distributed. The used TCP module is Reno with receiver window size of 65535 byte. The configured lub link is an ATM E1 line (2 Mbps) with a reserved bandwidth of 1500 kbps for the user plane and the remaining bandwidth consumed for signaling and control channels. For all scenarios the simulations run 3600 simulated seconds. The stability and reliability of the measured statistics of average file or page transfer delay from simulations are evaluated by means of Confidence Intervals. The evaluation results show that 3600s simulation time is sufficient to reach stable results for all investigated cases in this thesis, as 6 Dimensioning for Single ATM-Based lub the obtained simulation results are proven to be reliable and stable. Several examples are given in Appendix A.20. 6.3.8.2 Single RAB without Applying CAC This section validates the extensions proposed in section 6.3.7.1 on the M/G/R-PS model for cases where a single RAB type is served for all elastic flows and no CAC function is applied in the UTRAN transport network. In the following investigated scenarios, all UEs are given the same RAB rate of 128 kbps. For validations, ftp application is used and constant file size distribution is chosen. This scenario investigates the accuracy of different versions of M/G/R-PS models: the basic PS model in section 6.3.5, the extended PS model in section 6.3.6, and the adjusted PS model proposed in section 6.3.7.1. In this scenario, the applicati