| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 94 === The current cellular network was proceeded toward the “ Pico-Cell” architecture (decreasing cell ranges) to facilitate channel reuse and improve the system performance. However, decrease of cell range will increase the chance of handoff. Although most of the general bandwidth reservation schemes could lower the handoff dropping ratio, but they would also sacrifice the bandwidth of new call, which causes the over-raising of new call blocking ratio. On the other hand, they might also fail to adjust the optimization of bandwidth allocation and traffic management according to the network traffic variation.
In this paper, we propose a dynamic bandwidth reservation (DBR) system. There are always differences between the handoff call number and new call number in different environment, and our DBR algorithm could dynamically adapt the reserved bandwidth between the handoff call and new call, which prevents the over-raising of blocking ratio of new call. Therefore, our algorithm could keep handoff dropping ratio and new call blocking ratio in the tolerant range and improve the system bandwidth utilization despite the change of environment.
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