IEEE 802.16e 寬頻無線存取網路之動態允入控制及頻寬保留演算法

Abstract

對於IEEE 802.16e-2005我們提出動態允入控制及頻寬保留演算法。在IEEE 802.16e的規範把行動式頻寬無線存取系統也加入，所以如何讓連線不中斷並且有較低延遲的無縫細換手就變的非常重要。本研究在IEEE 802.16e無線都會型網路(Wireless Metropolitan Area Network; WMAN)中如何去動態調整允入的QoS參數且在連線允入後去調整換手連線與新進連線之間使用頻寬問題。在IEEE 802.16e行動寬頻網路中為了讓行動端可順利切換到鄰近基地端，因此基地端如何保留適當頻寬給予換手連線用戶以降低換手延遲和丟棄機率，同時又能提高系統使用效率以讓新進連線能有效率的使用頻寬資源將是我們探討的問題。我們將以理論推導的方式分析無線網路中新進連線與換手連線在不同比例下保留頻寬對於服務品質和系統效能的影響，並且以此理論模型為基礎提出我們的連線允入控制與頻寬保留演算法。我們設計的演算法將會考慮目前基地端網路負擔情況來動態調整允入控制的規則和換手連線之保留頻寬，以提昇換手連線用戶的服務品質，並且同時增加頻寬使用效能。 The thesis presents the problem for handover and new connection between allocation bandwidth in IEEE 802.16e Worldwide Interoperability for Microwave Access. In IEEE 802.16e mobile bandwidth networks, it is important to assure seamless handover and the base station how to adaptively reserves bandwidth for the handover connection to decrease handoff latency and dropping probability, moreover, it is worthy investigate the problem of increase system efficiency for the new connection to use bandwidth resource. In wireless networks, the new and the handover connection in the different proportion to reserve bandwidth for the quality-of-service and system efficiency by theoretical analysis. Besides, we propose the Connection Admission Control Algorithm is according to theoretical mold. The algorithm is considering the load condition for the network of base stations which is adjust admission control and reserve handover connection bandwidth to increase the quality-of-service and the using bandwidth efficiency for the subscriber handover connection.