 is also performed by simulations. In the simulations, for each scenario, the last mile links are configured with the dimensioned bandwidth obtained from the previous simulations (see Figure 8.14(a)), the bandwidth of the backbone link will be adjusted until the desired end-to-end delay factor of each service class 8 Dimensioning for Multi-Jub RAN Scenario is met. It can be seen in Figure 8.15(a) that the analytically derived backbone link bandwidths based on the M/G/R/N-PS model match well with the simulation results. Figure 8.15(b) shows the corresponding relative errors of the analytical results. Dimensioning the last mile link Relative error of dimensioned last mile bandwidth M/G/R/N-PS Simulation target delay factor for the last mile link target delay factor for the last mile link (a) last mile link bandwidth (b) relative error Figure 8.14: Dimensioned last mile link bandwidths over different target delay factors in the star-structured IP-based UTRAN with DiffServ QoS scheme Dimensioning the backbone link Relative error of dimensioned backbone link bandwidth M/G/R/N-PS Simulation target delay factor for the backbone link target delay factor for the backbone link (a) backbone link bandwidth (b) relative error Figure 8.15: Dimensioned backbone link bandwidths over different target delay factors in the star-structured IP-based UTRAN with DiffServ QoS scheme In addition, the achieved end-to-end delay of each service class for the above three QoS scenarios are given in Table 8.5. For each scenario, the target end-to-end delays are shown, which are calculated according to the desired end-to-end delay factors as defined in Table 8.4. Besides, the corresponding end-to-end delays measured from the simulations (which are configured with the dimensioned last mile link and backbone link bandwidths in the IP transport network) are given. In Table 8.5, through comparing the target delays to the 8.4 Dimensioning for Elastic Traffic in IP-Based UTRAN simulated values, it is found that the target end-to-end delay QoS of ever