Mobile communication system has evolved remarkably since its first deployment. The tremendous growth in the mobile subscribers and the introduction of new services in the next generation of wireless networks have posed challenging problems in providing quality-of-service support for various of applications. In this thesis research, we first propose an efficient adaptive call admission control scheme which can guarantee the QoS requirement without any prior knowledge of traffic parameters and signaling overhead. The novelty of this scheme lies in its ability of dynamically obtaining traffic parameters and status information through local on-line estimation. Simulation results demonstrate the satisfactory system performance of this on-line estimation algorithm under different system setup...[ Read more ]

Mobile communication system has evolved remarkably since its first deployment. The tremendous growth in the mobile subscribers and the introduction of new services in the next generation of wireless networks have posed challenging problems in providing quality-of-service support for various of applications. In this thesis research, we first propose an efficient adaptive call admission control scheme which can guarantee the QoS requirement without any prior knowledge of traffic parameters and signaling overhead. The novelty of this scheme lies in its ability of dynamically obtaining traffic parameters and status information through local on-line estimation. Simulation results demonstrate the satisfactory system performance of this on-line estimation algorithm under different system setups. The simplicity and efficiency of this scheme makes it possible to be put into actual deployment.

Another scheme proposed is the dual-threshold reservation scheme (DTR) for integrated voice/data wireless networks. The next generation of mobile networks is expected to carry multimedia traffic. Bandwidth allocation and management is of great importance due to spectrum limitation. DTR is proposed to provide effective bandwidth management while satisfying the QoS requirement in terms of voice handoff dropping probability, voice blocking probability and data loss probability. An analytical model based on this scheme is developed. In addition, for the DTR model, the selection of optimal thresholds is of great importance to maximize spectrum utilization while guaranteeing the QoS requirements. Based on the observation of the relationship between thresholds and system performance, we propose two algorithms to reduce the high computational complexity in finding the optimal thresholds.