April 2010
Intermediate to advanced
588 pages
19h 56m
English
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9.4 User-centric Radio Resource Management in UTRAN
(Portion reprinted, with permission, from O. Abdul Hameed, S. Nasir, H. Karim, T. Masterton, A.M. Kondoz, “Enhancing wireless video transmissions in virtual collaboration environments”, Mobile and Wireless Communications Summit, 2007. 16th IST, vol., no., pp.1–5, 1–5 July 2007. ©2007 IEEE.)
9.4.1 Enhanced Call-admission Control Scheme
In this section, an enhanced power-based downlink call-admission control scheme is presented. The aim of this scheme is to improve the blocking probability for high-priority new call requests such as emergency services call requests. The scheme was designed based on radio resource management works in [57,58]. It takes the user input into account at call-admission control time. The user input is obtained by classifying the new call requests, according to how much they are willing to pay for the services, into three service classes, being Enhanced, Moderate, and Normal. For each new call request, the new call's service class is generated as 50 % for Normal, 30 % for Moderate, and 20 % for Enhanced. The scheme adopts quality optimization using QoS renegotiation or a pre-agreed service level agreement (SLA) such that lower-priority existing calls can give their radio network resources to higher-priority new call requests. Each user has a service quality profile for each traffic type, such as voice, video, or data, that defines maximum and minimum data rates. The scheme is illustrated in Figure 9.54
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