大型無線通訊網路之無隙縫連結服務; Seamless Connectivity for Large Scale Cellular Networks

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题名:	大型無線通訊網路之無隙縫連結服務;Seamless Connectivity for Large Scale Cellular Networks
作者:	金明輝;Ming-Hui Jin
贡献者:	資訊工程研究所
关键词:	位置資料庫;換手;位置管理;頻道分配;無隙縫;無線通訊;位置預測;移動行為;Location Management;Handover;Location Database;Moving Behavior;Location Prediction;Seamless;Channel Assignment;Cellular Network
日期:	2002-10-03
上传时间:	2009-09-22 11:25:58 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	在追尋高品質移動化傳輸服務的趨勢下，如何利用有限的無線通訊頻道資源來滿足急速增加的無線通訊用戶之通訊需求是一個充滿急迫性的問題。在有限頻道資源的限制下，為了提供用戶無止盡的通訊服務需求，縮小各基地台的服務範圍以減少各基地台之服務用戶的數量並同時提升頻道資源之重複使用率就成為最後的解決策略。然而，這種策略不但提升了用戶位置管理之複雜度，也大幅度地增加了換手(Handover)事件的發生頻率。在本論文中，針對提高頻道資源之重複使用率，我們根據目前多數系統業者之需求提出了一個新的成本模型並設計了一個分解演算法。為了提升位置管理之效能，本論文提出一個分散式位置資料庫之架構，此架構可迅速有效地調整運作效能以提升位置管理之能力。此外，本論文亦根據各用戶之移動行為來設計適合各用戶之查詢範圍，並依此提出一個新穎的位置追蹤策略。最後，為了讓換手的程序更加平順，本論文整合了切線速度預測法與我們所提出之移動行為預測法來保留適當的頻道資源供換手之通訊連線使用。這些研究議題與我們所提出之解決策略在本論文中有更詳盡的描述。本論文亦評估我們所提出之各解決策略所得到的解之品質與運作效能，而實驗結果顯示我們所提出之解決策略確實有效地提升通訊品質與系統運作效能。 In the trend of mobilization which highly affects quality of service in mobile multimedia network, the acute problem of supporting the maximum number of mobile applications under the limited channel resources is urgent to be solved. To satisfy the eagerness of profuse bandwidths under limited radio resources, diminishing the coverage area of cells to reduce the number of clients for each base station while increasing the channel reusability seems to be the most adopted solution. This, however, not only increases the difficulty of location management, but also increases the number of handover events. In this dissertation, we first propose a new cost model and a decomposition algorithm for increasing the channel resources reusability directly. To improve the performance of location management, a distributed location database architecture which facilitates performance tuning is proposed in this dissertation. Besides, we propose a novel location tracking strategy whose paging areas are designed according to the moving behavior of each mobile terminal. Finally, to make each handover activity smooth, we integrate the tangent velocity approach and behavior based approach for estimating the handover prediction of each active mobile terminal and then estimate the most appropriate number of guard channels for handover connections. The problem issues and proposed strategies for each one of them are further introduced in this dissertation. The performance and solution quality of our proposed strategies are evaluated and the experimental results demonstrate that the proposed strategies do improve the communication quality and system performance.
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