| Summary: | 碩士 === 國立成功大學 === 工程科學系專班 === 97 === To download the multimedia fast in anytime and anywhere, almost mobile subscribers aspire to have a wireless network with low latency, high speed mobile transmission, and guarantee of QoS, but it seems very difficult to find out until the mobile WiMAX. The mobile WiMAX (802.16e) provides the functions of low latency, high speed mobile transmission, and guarantee of QoS, but the shortage of bandwidth is an existing problem to wireless network, it can’t be resolved for us, due to government rules. So we just can do one thing that is saving the bandwidth, don’t waste it, that’s all. How to saving the bandwidth, right here we purpose a novel scheme of Adaptive Dynamic Subcarriers allocation (ADSAS). It can not only saving the
bandwidth, also can increase the connection capacity of Base Station during the shortage of bandwidth situation. The ADSAS mainly integrates the “Adaptive Modulation and Coding Scheme, AMC＂ with the “Adaptive Call Admission Control Scheme, ACAC＂. And it is also consider the QoS of all connected subscribers. So it is a nice scheme for bandwidth management.How to increase the connection capacity for mobile WiMAX (802.16e), first the ADSAS will require all connected subscribers to respond the buffer sizes and the transmission mode,then according to them, we can make sure how long the base station doesn’t need to provide the bandwidth for the connected subscriber.
Meanwhile release the bandwidth of the connected subscriber to new subscriber. So that is ADSAS rule.
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