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研究生:劉啟煌
研究生(外文):Liu,chi-huang
論文名稱:模糊控制的動態載波配置方法
論文名稱(外文):A Dynamic Radio Resource Allocation Approach with Fuzzy Controller in Wireless Cellular Network
指導教授:許榮隆許榮隆引用關係
指導教授(外文):Hsu,Jung-Lung
口試委員:許榮隆王堯天歐崇明
口試委員(外文):Hsu,Jung-LungWang,Yao-TienOu,Chung-Ming
口試日期:2011/05/14
學位類別:碩士
校院名稱:開南大學
系所名稱:資訊管理學系
學門:電算機學門
學類:電算機一般學類
論文種類:學術論文
論文出版年:2011
畢業學年度:99
語文別:中文
論文頁數:67
中文關鍵詞:模糊控制負載平衡動態載波配置蜂巢式網路
外文關鍵詞:Fuzzy ControllerLoad BalancingDynamic radio resource allocationHexagonal cellular networks
相關次數:
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  • 下載下載:6
  • 收藏至我的研究室書目清單書目收藏:0
在無線通訊網路中,由於負載流量的不平衡會讓基地台產生尖峰時段,且可能在尖峰時段引起高阻塞率。以往常用的方法是使用負載指數的門檻值去決定基地台的負載狀況。然而,接近門檻值的負載指數卻存在著乒乓效應。這結果導致不穩定的系統和不必要的訊息更新。此外,負載的流量估計是困難且費時的。為了彌補傳統設計的缺點,因此需要一個智慧型預測機制。我們將在本文中提出模糊控制的方法去預測基地台負載狀態,以及解決動態頻道配置問題。基地台負載決策、基地台交涉的複雜性和多頻道配置等,三個新策略也會呈現在本文中。此新研究及策略可使通訊系統具有快速選擇且準確的方式來判斷系統之負載狀態,且根據不同的輸入變數對系統產生的影響及關係,利用各基地台的之負載狀態指標來決定在各基地台間之頻道借用方式與數目,在此研究過程中,我們針對頻道隨機配置和選擇性配置的負載平衡,兩種不同方式的通訊服務需求及不同系統情境的頻道借用演算法,提出表現更佳之新演算法模糊控制基礎的動態頻道配置方法。模糊基礎的動態頻道配置方法對照其他演算法顯示出更好的適應性、強健性和容錯性能力。透過模擬評估阻塞率、更新管理和取得頻道延遲時間。結果證明我們的演算法擁有較低的阻塞率、較少的更新管理和較短的頻道延遲時間。
The fuzzy-based dynamic radio resource allocation scheme is presented to maximize the number of served calls in a distributed wireless cellular network. The uneven traffic load may create hot-spot cells and possibly causes a high blocking rate in hot-spot cells. Most conventional methods use load indices with a threshold value to determine the load status of a cell. However, there exists a ping-pong effect, as loads are around the threshold value. This result causes an unstable system and unnecessary message passing overhead. In addition, the estimation of traffic load is difficult and time-consuming. Thus, an intelligent prediction mechanism is needed. In this paper, we develop a method to predict the cell load and to solve the radio resource allocation problem based on the fuzzy controller. A new radio resource allocation algorithm with multi-channels allocation is also presented in this paper. A allocation mechanism supporting the present facility has been built on the application-level of wireless cellular networks. The fuzzy-based dynamic radio resource allocation scheme exhibits better adaptability, robustness, and fault-tolerant capability thus yielding better performance compared to other algorithms. Through simulations, we evaluate the blocking rate, update overhead, and channel acquisition delay time of the proposed method. The results demonstrate that our algorithm has lower blocking rate, less updated overhead, and shorter channel acquisition delays.
目 錄

中文摘要 ----------------------------------------------------------------------------------- I
ASBTRACT ------------------------------------------------------------------------------- III
目錄 ------------------------------------------------------------------------------------------ V
表目錄 -------------------------------------------------------------------------------------- VII
圖目錄 -------------------------------------------------------------------------------------- IX

第一章 緒論

第一節 研究背景 ---------------------------------------------------------- 1
第二節 研究動機 ---------------------------------------------------------- 2
第三節 研究目的 ---------------------------------------------------------- 3

第二章 文獻探討-

第一節 固定頻道配置 --------------------------------------------------- 7
第二節 動態頻道配置 --------------------------------------------------- 8
第三節 頻道隨機配置 --------------------------------------------------- 10
第四節 選擇性配置的負載平衡 ------------------------------------- 14

第三章 研究方法

第一節 以模糊為基準的蜂巢式系統模式 ----------------------- 19
第二節 基地台負載決策 ----------------------------------------------- 22
第三節 基地台交涉的複雜性 ---------------------------------------- 32
第四節 多頻道轉移 ------------------------------------------------------ 36

第四章 實驗結果

第一節 阻塞率與流量到達率 ---------------------------------------- 41
第二節 阻塞率與多媒體服務的多重頻道需求 --------------- 42
第三節 熱門基地台間的平均通話阻塞次數比較 ------------ 44
第四節 熱門基地台間的平均訊息更新次數比較 ------------ 45
第五節 熱門基地台間的平均取得延遲時間比較 ------------ 46

第五章 結論 ---------------------------------------------------------------------------- 47

參考文獻 ----------------------------------------------------------------------------------- 48






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