RT traffic and RT streaming individually. The proposed dimensioning approach for elastic traffic is based on the extension work of the M/G/R-PS model. The analytical approach was validated by the simulations. The simulation results demonstrate that the proposed analytical methods can appropriately estimate the application performances of the different service classes, hence we can efficiently plan bandwidth capacity of the network links and promise multi-service QoS provisioning in the IP-based UTRAN. At the end of this chapter, the performance and the dimensioning of the IP-based lub is compared with the ATM-based lub. The comparisons show that the IP transport has more gain for the higher RAB rate bearers due to a relatively lower transport overhead and thus a higher bandwidth efficiency. However, generally it is suggested to apply multiplexing schemes to improve the transport efficiency, especially for the lower RAB rate bearers. But a balance should be given between the bandwidth efficiency and the transport network delay by optimizing the multiplexing scheme parameters. 8 Dimensioning for Multi-lub RAN Scenario After the investigation of dimensioning for the single link scenario in the previous chapters, this chapter focuses on the dimensioning for the multi-lub Radio Access Network (RAN) considering a star network topology. In this chapter, individual dimensioning approaches presented for dimensioning the circuit-switched traffic and the elastic traffic, each of them tailored individually for ATM and IP based RAN, which allows dimensioning of the last mile link for each Node B and the backbone link individually. One related issue on dimensioning of the lub backbone link is overbooking. It is a popular technique used by network operators to allocate less bandwidth on the backbone link than the total bandwidth request by all connected last mile links. For a cost-efficient dimensioning of the backbone link, an optimum overbooking is desired to provide balance between the costs and the QoS objectives. In this c