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研究生:蔡宗勳
研究生(外文):Tsung-Hsun Tsai
論文名稱:基於斷訊機率考量來調整WCDMA系統引導功率之研究
論文名稱(外文):A Study of Pilot Power Adjustment in WCDMA Systems Based on Outage Probability
指導教授:吳介騫
指導教授(外文):Jieh-Chian Wu
學位類別:碩士
校院名稱:國立高雄第一科技大學
系所名稱:電腦與通訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:中文
論文頁數:96
中文關鍵詞:負載平衡共同引導功率斷訊率
外文關鍵詞:outage probabilityload balanceCPICHWCDMA
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在都會區,細胞處於重負載狀態是不可避免的情況。在負載率和行動用戶的斷訊率成正比的情況下,解決重負載情形下的高斷訊率成了一個重要的議題。本論文透過兩種指標過度收縮比率與過度擴張比率去評估在負載平衡機制下,共同通道引導功率是否導致細胞過度擴張或者收縮,並藉由所提之演算法降低細胞於過度調整CPICH功率狀況下所附加造成的斷訊率。
本研究在行動台均勻分佈的環境下進行有序動態模擬,讓行動台貼近真實情況於街道上模擬移動,而行動台因為不斷移動,其與基地台相對位置的龐大樣本組合是驗證演算法是否有通適性的最佳方法。本論文之演算法無論在行動台動態均勻分佈環境下或者動態熱點分佈環境下,斷訊率都有顯著的改善。本演算法除了在高負載環境下有顯著效能外,更因其彈性的演算機制,可以導入其他已存在之負載平衡之演算法上。藉以降低其斷訊率。
Cells in heavy loading status is unavoidable in urban. Reducing high outage probability is a crucial issue due to the fact that outage probability is proportional to system loading. Our research is based on the estimation that if Common Pilot Channel power is over adjusted; or if the range of available signal is over shrinking or expanding. Our approach is to adjust the pilot power by two indicator: over shrinking ratio and over expanding ratio. The proposed method could reduce outage probability while load balancing is also maintained.
  We simulate under the environment that mobile stations move along the street in the real world alike. Because of mobility, there are plenty relative positions between mobile stations and base stations, it can be shown that our proposed algorithms can improve outage in generally situation. Furthermore, our proposed algorithms can significantly reduce outage probability in case of uniform dynamic distribution or dynamic hot spot. Specially in heavy loading status. It could be used to modify existing algorithms and improve outage performance.
中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
表目錄 ix
圖目錄 xi
第一章 緒論 1
1.1 前言 1
1.2 研究背景和動機 2
1.3 研究目的 3
1.4 論文架構 4
第二章 背景知識與相關研究 5
2.1 前言 5
2.2 第三代通訊系統 6
2.2.1 WCDMA 6
2.2.2 CDMA2000 7
2.2.3 TD-SCDMA 8
2.3 WCDMA系統架構 8
2.3.1 用戶設備(UE) 9
2.3.2 陸地無線接取網路(UTRAN) 9
2.3.3 核心網路(CN) 10
2.3.4 外部網路 11
2.4 WCDMA通道類型 11
2.4.1 傳輸通道 11
2.4.2 實體通道 13
2.5 無線通道傳播特性 15
2.5.1 路徑衰減 16
2.5.2 多重路徑 17
2.5.3 屏蔽效應 17
2.6 無線電資源管理 18
2.6.1 允諾控制 18
2.6.2 封包排程 18
2.6.3 功率控制 19
2.6.4 負載控制 20
2.6.5 交遞控制 20
第三章 研究方法 21
3.1 負載平衡機制 21
3.1.1 調整共同引導通道功率 21
3.1.2 調整天線傾角 23
3.1.3 軟式交遞參數調整 23
3.2 文獻探討 25
3.3 系統模擬環境 35
3.4 文獻討論 39
3.5 系統模型 43
3.5.1 問題描述:呼吸效應 43
3.5.2 問題描述:CPICH Ec/Io訊號強度門檻值限制 44
3.5.3 問題描述: DPCH功率容量限制 47
3.5.4 問題討論 50
3.5.5 改善之演算法 52
第四章 研究結果與效能分析 61
4.1 均勻動態分佈下之表現 61
4.2 動態熱點分佈環境下之表現 71
4.2.1 Hot Spot Scenario 1 73
4.2.2 Hot Spot Scenario 2 77
4.2.3 Hot Spot Scenario 3 80
4.2.4 Hot Spot Scenario 4 83
第五章 結論 93
文獻參考 94
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