 suggested extensions, which are developed in the framework of this thesis to apply for lub dimensioning under different UMTS network and traffic configurations. Section 6.3.7.1 proposes several adjustments to the above introduced extended M/G/R- PS model to consider variable round trip times and asymmetric data transfer in the UMTS network, as well as to include the TCP connection setup and release times. This adjusted M/G/R-PS model can be applied to the situation where all UEs are assigned to the same RAB type (i.e. have the same peak data rate) and there is no CAC applied to elastic traffic (i.e. elastic traffic is not subject to CAC). Section 6.3.7.2 presents M/G/R/N-PS model for the cases of applying CAC to elastic traffic in the UTRAN transport network, also only a single RAB type is considered for all UEs. Both M/G/R-PS and M/G/R/N-PS models proposed for 6 Dimensioning for Single ATM-Based lub the lub dimensioning have also been presented by the author in [LSGT05]. Section 6.3.7.3 expands the M/G/R-PS model to a general form as presented in [LSGT06], which can be applied for having multiple RAB types in UMTS for different use groups with different RAB rates and QoS requirements. Section 6.3.7.4 presents the applications of the M/G/R-PS model for having variable peak rates per flow with the use of BRA function (which adapts the RAB rate dynamically for each user connection during its data transfer). In cases of multiple RABs and BRA, it is assumed that there is no CAC function applied to elastic traffic. Section 6.3.7.5 discusses the scenarios where elastic traffic is mixed with circuit-switched type of traffic. In this scenario, the circuit-switched traffic is given a higher priority to transfer over elastic traffic in the UTRAN transport network. In section 6.3.7.5 analytical approaches are presented for the mixed traffic scenarios to estimate the average transaction times of elastic traffic, taking into consideration the effect of bandwidth sharing. 6.3.7.1 Extension for case with Single RAB and not App