博碩士論文 etd-0709116-112742 詳細資訊


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姓名 林宜洵(Yi-hsun Lin) 電子郵件信箱 E-mail 資料不公開
畢業系所 電機工程學系研究所(Electrical Engineering)
畢業學位 碩士(Master) 畢業時期 104學年第2學期
論文名稱(中) 在有微小型細胞嵌入的大型細胞扇形網路上建立數學分析模型
論文名稱(英) An Analytic Model for a Small-cell Embedded Large-cell Sectored Network
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    紙本論文:5 年後公開 (2021-08-09 公開)

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    論文語文/頁數 中文/85
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    摘要(中) 本論文提出一個小型細胞嵌入大型細胞的扇形網路(Small-cell Embedded Large-cell Sectored Networks, SELSN)的網路架構,一SELSN可以分為sector和small cell兩個區域,我們使用部分頻率復用(Fractional Frequency Reuse, FFR)的方法來增加整體系統的通道(channels)總數,並依照sector的個數為奇數或偶數分別將頻寬分成三段或兩段。為了分析所提出的SELSN的new calls (NC)和handoff calls (HC)的連線中斷機率,我們使用馬可夫鏈建立數學模型,在數學模型中,我們透過一個行動裝置(mobile station, MS)所在sector和small cell的面積和邊界長度、MS的移動速度和方向推導出HC的換手率(handoff rate)。從HC的換手率中,我們推導出馬可夫鏈的狀態轉移矩陣以求得每個狀態的機率,最後我們藉著改變一個small cell的半徑大小、sector的個數、MS的移動速度來比較分析NC和HC的連線中斷機率,從連線中斷機率中,我們求得MS的平均等待時間(average waiting time, AWT)和整體系統的產出(throughput)。
    摘要(英) In this thesis, we propose a small-cell embedded large-cell sectored network (SELSN) architecture. An SELSN can be divided into two regions, the sector and the small cell. We increase the total number of overall system channels by using fractional frequency reuse (FFR), and divide the bandwidth into two or three sections depending on whether the number of sectors is even or odd. In order to analyze the new-call (NC) blocking and handoff-call (HC) dropping probability of the proposed SELSN, we build a mathematical model of Markov chains. In the mathematical model, we derive the handoff rate from HC by the area and the boundary length where a mobile station (MS) stays, and the speed and the direction of an MS. Based on the handoff rate of HC, we derive the Markov chain’s transition matrix to obtain the probability of each state. Finally, we change the size of a small cell’s radius, the number of the sectors, and the speed of MS to analyze the NC blocking and the HC dropping probability. From the two probabilities, we obtain the average waiting time (AWT) of an MS and the throughput of the overall system.
    關鍵字(中)
  • 連線中斷機率
  • 馬可夫鏈
  • FFR
  • 換手率
  • 扇形區域
  • Small cell
  • 關鍵字(英)
  • blocking and dropping probability
  • FFR
  • handoff rate
  • sector
  • small cell
  • Markov chains
  • 論文目次 致謝 i
    摘要 ii
    Abstract iii
    目錄 iv
    圖表目錄 vi
    第一章 緒論 1
    1.1 研究動機 1
    1.2 研究方法 1
    1.3 章節介紹 2
    第二章 小型細胞嵌入大型細胞的扇形網路 3
    2.1 SELSN之架構 3
    2.2 FFR 4
    2.3 New Call和Handoff Call的換手率 6
    2.4 相關研究 8
    2.5 本論文所提出的SELSN 12
    第三章 建立馬可夫鏈的數學模型 13
    3.1 系統架構 13
    3.2 UE在small-cell與sector之間的換手率 15
    3.3 馬可夫數學模型的建立 17
    3.3.1 數學模型的假設 18
    3.3.2 Arrival Rate和Departure Rate 18
    3.3.3 馬可夫鏈狀態計算 31
    3.4 效能參數的推導 36
    3.4.1 Blocking與Dropping機率 36
    3.4.2 Average Waiting Time 39
    3.4.3 Normalized Throughput 44
    第四章 數學分析與結果討論 50
    4.1 效能參數的設定 50
    4.2 數值結果與分析 51
    4.2.1 固定small cell的半徑 51
    4.2.1.1 NC被block的機率 51
    4.2.1.2 HC被drop的機率 53
    4.2.2 改變small cell的半徑與sector的數目 56
    4.2.2.1 MS的AWT 57
    4.2.2.2 Sector和Small-cell的NT 60
    4.2.3 實驗結果摘要 62
    第五章 結論與未來工作 64
    5.1 結論 64
    5.2 遭遇的困難 64
    5.3 未來工作 65
    References 66
    Acronyms 72
    Index 73
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  • 口試日期 2016-07-27 繳交日期 2016-08-09

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