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UBC Theses and Dissertations

Quality of service provisioning in cellular mobile networks Yu, Fei

Abstract

In recent years, tremendous growth has occurred in the use of cellular mobile communications around the world. This thesis studies Quality of Service (QoS) provisioning in cellular mobile networks. In order to guarantee the handoff dropping probability of mobile users in cellular networks, call admission control and bandwidth reservation schemes are proposed based on more realistic assumptions than those made in existing proposals. A mobility prediction scheme is derived from data compression techniques that are both theoretically optimal and good in practice. In order to utilize resources more efficiently, the proposed scheme predicts not only which cell the mobile will handoff to but also when the handoff will occur. Based on the mobility prediction, bandwidth is reserved to guarantee a given target handoff dropping probability. Simulation results show that the proposed schemes meet our design goals and outperform the static reservation scheme. We also develop a framework of combining QoS provisioning and mobility management in cellular mobile networks. The key component of this framework is a common mobility prediction scheme, which can be used in both locating/paging mobiles and in making admission decisions. Novel QoS provisioning and mobility management schemes are proposed in this framework. The performance of the proposed schemes is evaluated using simulations. Adaptive multimedia applications that can operate over a wide range of available bandwidths are expected to be used in future cellular mobile networks. We present a QoS provisioning scheme in adaptive multimedia cellular networks via reinforcement learning. The proposed scheme does not require explicit state transition probabilities, and therefore, the underlying assumptions of this scheme are more realistic than those in previous schemes. Simulation results demonstrate the superior performance of the proposed scheme over some of the existing methods. Finally, call admission control for cellular-to-Internet protocol (IP) internetworking is studied. In order to provide QoS to the Internet and avoid scalability problems, several recent papers propose endpoint measurement-based admission control (EMAC) scheme. Although EMAC has many desirable features in the wireline networks as shown in previous work, in this thesis, we show that several distinct characteristics in cellular mobile networks make EMAC difficult to implement. A novel mobile-EMAC (M-EMAC) scheme for cellular-to-IP internetworking is proposed. Simulation results show that M-EMAC outperforms EMAC in cellular mobile networks.

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