the transport solutions, it can be concluded the obtained user and transport network performances of using 3 VPs is slightly better than the 2 VPs due to a better protection for the signaling traffic at the expenses of one additional VP. From the performance perspective, the 3 VP setup is the best transport solution as it provides a clear traffic separation and QoS differentiation. However, it also requires additional cost for buying a separate VP. By taking considerations of both QoS and network costs, both 2 and 3 VPs solutions can be considered for the network operators or service providers to design a UMTS access network to transport both Rel99 and HSPA traffic. A.17 Dimensioning for Mixed Traffic Cases (ATM-Based Iub) The following results in Figure A.29 validate the proposed dimensioning approach for the mixed traffic scenario in the ATM-based lub. The analytical dimensioning model is presented in section 6.3.7.5 and its corresponding dimensioning approach is given in section 6.3.9. In the given example, there is 40% voice traffic and 60% web traffic. The traffic model of the voice traffic is according to Table 5.2. And web users request a constant 50 kbyte web page with RAB 128 kbps. For dimensioning process, the desired QoS target for the elastic traffic is the end-to-end delay factor of 1.23. It can seen in Figure A.29 that the analytical calculated bandwidth based on M/G/R-PS model is able to provide accurate estimations on the bandwidth requirements (shown in the left diagram) with a relative error less than 10% (shown in the right diagram). Appendix Dimensioned lub bandwidth (mixed traffic scenario) Relative error of M/G/R-PS results M/G/R-PS simulation link throughput (kbps) link throughput (kbps) Figure A.29: Validating the dimensioning approach for the mixed traffic scenario for web traffic: RAB 128 kbps, no CAC, page size =50 kbyte, delay factor f = 1.23 for voice traffic: AMR 12.2 kbps codec A.18 Validating Dimensioning Approaches for Multi-lub IP RAN Validation for Approach (1) The approach (1) 