| The IETF's Differentiated Services (DiffServ) architecture provides a general framework for provisioning quality of service (QoS) over the Internet. Extending the DiffServ architecture to mobile users of the third generation (3G) wireless systems is expected to provide a low cost means of running guaranteed-service applications on personal communication devices.; In this thesis, we extend the proportional delay differentiation to 3G mobile systems, and provision such service on the downlink of wide-band code-division multiple access (W-CDMA) air interface. We seek to devise a set of admission control and scheduling mechanisms that aim at maximizing the effective throughput of the system. Taking user mobility and CDMA soft capacity into consideration, two proportional delay differentiation schedulers and an admission control scheme integrated with power prediction are proposed. Our simulation results show that significant improvement in the average delay, fairness among the DiffServ classes, and the total effective throughput can be attained using the predictive admission control scheme. |
