Dimensioning for Single IP-Based Iub
After studying the dimensioning of the ATM-based Iub, this chapter is focused on dimensioning the IP-based Iub of a single link. Different than the ATM-based UTRAN, the IP-based UTRAN employs IP as the underlying transport technology and thus has a different protocol stack and transport network. Additionally, it applies IP QoS schemes in the transport network to serve various service classes with different priorities. In the framework of this thesis, the investigated IP-based UTRAN applies the Differentiated Service (DiffServ) QoS scheme and a combined Weighted Fair Queue (WFQ) and Strict Priority (SP) scheduling strategy in the IP transport network, in order to distinguish different service flows and guarantee the desired QoS for various service classes. For dimensioning such an IP-based URRAN, in this chapter analytical models are proposed to determine the required IP bandwidth for the Iub link to satisfy user defined QoS of various service classes. Same as for dimensioning the ATM-based Iub, two fundamental traffic types are studied: elastic traffic and circuit-switched traffic. Section 7.2 presents analytical dimensioning models for circuitswitched traffic, and section 7.3 proposes analytical dimensioning models for elastic traffic. In section 7.4, the performances of ATM and IP based UTRAN and their required Iub link bandwidths are compared.
KeywordsService Class Best Effort Bandwidth Efficiency Connection Admission Control Expedite Forwarding
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