 link capacity is demonstrated Figure 6.40. Larger peak rates require larger bandwidth values. In Figure 6.41, the impact percentage of mixed voice traffic on the required link capacity is shown. The more portion of circuit-switched voice traffic, the higher gain can be achieved and thus less demand of the total link bandwidth. 6.4 Dimensioning for Transport Network Performance pure web traffic web traffic + 40% Voice web traffic + 70% Voice 1000 1200 1400 1600 1800 2000 2200 2400 2600 Traffic load (kbps) Figure 6.41: Capacity vs. traffic load (different traffic mixes of web and voice traffic) for web traffic: RAB 128 kbps, no CAC, page size =50 kbyte, delay factor f = 1.25 6.3.11 Summary In Chapter 6.3, the dimensioning process for elastic traffic was addressed. Analytical dimensioning models are presented, which are based on the theory of processor sharing. A number of extensions on the M/G/R-PS model are suggested in this thesis for dimensioning the UMTS lub interface in different scenarios, which consider the UMTS specific features and resource management functions. The proposed analytical approaches are demonstrated by simulations. Overall, the simulation results comply with the theoretical expectations sufficiently well. This suggests that the extensions on the M/G/R-PS model which are proposed in this thesis can be applied to dimension the lub link for elastic traffic for different scenarios to guarantee a desired application QoS. 6.4 Dimensioning for Transport Network Performance As discussed in section 6.3.10, the transport network performance is also a critical QoS requirement for dimensioning the lub interface. The most important performance aspects in the UTRAN transport network are the packet delay or packet loss ratio (packet losses are actually caused by excessive long packet delays) over the lub interface. This chapter will present analytical models for dimensioning of the lub link in order to guarantee the lub transport delay performance, referred to as TNL performance in this thesis. The propose