fic model used by the HSPA UEs; (5) The total requested HSPA traffic load in cell i depicted by Pi ; (6) The scheduled data rate of HSPA UE j in cell i, depicted by Rij where j < N ; It should be noticed that the data rate of each UE is the decision of the air interface scheduler, which takes into account the assigned cell capacities, the number of active HSPA UEs in each cell, the UE activities based on different traffic models, the UE channel conditions, other cell to own cell interference, soft handover UEs, and the congestion condition on the lub, etc. The air interface scheduler function is up to the equipment manufacturer implementation. Different scheduler schemes and configurations result in diverse decisions on the per UE uplink data rate. (7) Any extra congestion control functions used on the lub interface, which result in a congestion factor Q; (8) The required QoS for traffic type S: Qs as the target of the dimensioning Thus, for supporting a specific service type with Qs as the desired target of dimensioning, the lub bandwidth Iub_BW can be estimated according to the following general form given in equation below. Appendix lub_BW=1(~P., Q, Qs) (A-7) If the lub need to satisfy the QoS of several service types, then the maximum value out of the individual estimated lub BW of service type S with QoS target Qs should be taken for dimensioning. In the formula, Rij is the result of the scheduler. In general it is not an easy task to calculate it directly thanks to the complex function of the scheduler itself and also a large amount of information on the UE and network status is required, as described in (6). Hence in this thesis Rij is obtained via simulations. Usually, the cell capacity, the air interface scheduler, and the lub congestion control functions are specified and configured by the network operator, therefore this thesis mainly discusses the influence of different traffic models, number of HSPA UEs and various user QoS requirements on the lub dimensioning, by fixing the scheduler function, cell 