- 學位論文
異質行動網路的允入控制與交遞決策
Admission Control and Handover Decision in Heterogeneous Mobile Networks
摘要
為使營運商能提供客戶多樣化的服務，行動網路將會是以網際網路協定為基礎，並整合多種無線傳輸技術之異質行動多媒體網路。為有效管理無線系統資源，並提供服務品質保證給客戶，異質行動網路需要探討允入控制與交遞決策機制。本文分三大部份探討及分析以下議題：如何設計低複雜度且可支援多種媒體服務之允入控制方法? 如何以無縫隙交遞機制提供端對端的服務品質保證? 如何以允入控制及交遞決策整合之聯合無線資源管理機制提昇系統資源使用效率?並對現有允入控制方法及垂直交換標準作簡單探討。 首先，基於保護通道控制提出調適性多保護通道傳輸法則，並提出調適性比率參數，以達調適性目的，除藉由馬可夫鏈模型推導出系統的阻絕率與丟棄率外，並評估不同調適性比率參數的系統效能。此參數調整邊界的多保護通道允入控制方法可應用於需同時支援多種不同優先度的通訊媒體，數學分析與電腦模擬可證明該方法的有效性及便利性。也提出以MIH(IEEE 802.21)為基礎的QoS對應模式之多屬性決策垂直交遞方法，並運用於Wi-Fi 和WiMAX無線網路，電腦模擬證明該方法優於其他垂直交遞決策方法，本論文所提出來的方法與以訊號強度或成本函數為考量的換手方式進行效能比較，不管是在換手次數、阻絕率，或是基地台使用率的變化，都有較佳的結果。並提出一套基於模糊邏輯控制和多屬性決策的聯合無線電資源管理方式，以聯合管理各個無線存取技術之有效資源，透過此演算法完成無線電存取技術之選擇、水平換手、垂直換手、允入控制和負載平衡，達成集中管理之目標。 本研究成果的允入控制與交遞決策機制可延伸應用於整合UMTS 、LTE 、Wi-Fi 和WiMAX的異質無線網路之無線系統資源管理。也可應用於降低Mobile IP行動網路之交遞延遲。未來也可應用賽局理論於次世代行動網路的允入控制與交遞決策，以解決更複雜的無線網路資源管理議題。
並列摘要
In the future, mobile networks will be unified networks that use a flat architecture and a combination of diverse radio access networks through which network operators can provide a wide variety of services. To achieve this objective, the Call Admission Control (CAC) and vertical handover decision will ensure efficient use of system resources and provide required Quality of Service (QoS) to mobile users in heterogeneous mobile networks. Firstly, an adaptive multi-guard channel scheme (AMGCS) based CAC strategy to prioritize traffic types and handoff calls is proposed, in order to mediate the drawbacks of static and dynamic CAC schemes in cellular networks. The numerical results show that this scheme can be used to maintain the targeted QoS requirement by suitably setting the adaptive ratio parameters. A multi-attribute decision making (MADM) based vertical handover function is also proposed to support a media-independent handover (MIH) mechanism. Using an MIH mechanism that supports seamless handover, a QoS model with MADM handover decision is proposed, in order to provide seamless mobility between Wi-Fi (Wireless-Fidelity) and WiMAX (Wireless Metropolitan Area Networks) networks. The simulation results show that the proposed scheme has smaller handover times and a lower dropping rate than RSS based system and cost function based vertical handover scheme. Because of its flexibility and simplicity, a fuzzy logic control (FLC) is used to ensure effective utilization of resources. The proposed joint radio resource management (JRRM) algorithm, combined fuzzy logic and MADM, allows proper initial Radio Access Technology (RAT) selection, horizontal handoff, vertical handoff, admission control and load balancing. These schemes could be applied to the study of the performance of radio resource management in a heterogeneous network which is integrated of UMTS (Universal Mobile Telecommunications System), Wi-Fi, LTE (Long Term Evolution) and WiMAX. In future work, game theory could be used to allow more complex and effective radio resource management schemes in heterogeneous wireless networks, for the next generation of mobile networks.
參考文獻
延伸閱讀
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