| Summary: | 碩士 === 國立花蓮教育大學 === 學習科技研究所 === 96 === Many mechanisms based on bandwidth reservation have been proposed in the literature to decrease connection dropping probability for handoffs in cellular communications. The handoff events occur at a much higher rate in packet-switched mobile WiMAX networks than in traditional cellular systems. An efficient bandwidth reservation mechanism for the neighboring cells is therefore critical in the process of handoff during the connection of multimedia calls to avoid the unwillingly forced termination and waste of limited bandwidth in mobile communication networks, particularly when the handoff traffic is heavy, as seen in mobile WiMAX networks. In this thesis, a self-adaptive bandwidth reservation scheme is proposed to reduce the call dropping probability of multimedia handoffs. Notably, a probabilistic mobility prediction model is adopted to estimate the bandwidth required in neighboring cells. The simulation results show that the proposed scheme can achieve superior performance than the representative bandwidth-reserving schemes in the literature when performance metrics are measured in terms of the call dropping probability for the handoffs, the call blocking probability for the new connections and bandwidth utilization.
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