博碩士論文 etd-0709108-173631 詳細資訊


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姓名 黃凱偵(Kai-chen Huang) 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 96學年第2學期
論文名稱(中) 針對有線及無線WiMAX網路的適應性頻寬分配
論文名稱(英) Adaptive Bandwidth Allocation for Wired and Wireless WiMAX Networks
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    摘要(中) 無論來自有線網路或者WiMAX網路的資料,皆想透過WiMAX的網路做傳輸時,因為WiMAX網路的可用頻寬有限,為了維持即時性資料的傳輸品質,又同時兼顧其他類別資料的傳送機會,在本篇論文中,我們提出一套ABA (Adaptive Bandwidth Allocation)機制為BS (Base Station)提供一套可滿足QoS的頻寬配置法,ABA會先針對一些對即時性要求高的高優先權類別資料,如影音串流等,分配最小需求的保障頻寬,先使其能滿足對延遲時間的最大上限,然後觀察其他對即時性沒有特別需求的低優先權資料是否已被犧牲太久,並為那些已被犧牲很久的低優先權資料適度的保留一些頻寬,使其因被犧牲而封包丟棄的情況能得到舒緩。最後若還有剩餘的額外頻寬,我們將用來給高優先權的資料作效能的提升。
    我們以四維的馬可夫鏈做網路效能分析,且將WiMAX的資料傳輸分為資料上載(Upload)和下載(Download)兩個階段,使用Poisson Traffic模擬網路上的流量,來分析其對系統的影響。最後試著以不同的網路參數和條件限制,觀察ABA演算法對平均延遲時間、平均傳輸率(Throughput)和平均封包丟棄率等結果的影響,並與他人的機制做效能的分析與比較。
    摘要(英) In this thesis, we consider a network environment which consists of wired Internet and a wireless broadband network (WiMAX); data from wired or wireless network are all conveyed through WiMAX links to its destination. In order to promise the quality of real-time traffic and allow more transmission opportunity for other traffic types, we propose an Adaptive Bandwidth Allocation (ABA) algorithm for BS to adequately allocate bandwidth. Our ABA algorithm would first reserve required minimum bandwidth for high-priority traffic, such as video streaming. By allocating minimum bandwidth to real-time traffic, the delay time constraint can be satisfied. Other traffic types, such as non-real-time, which have no real-time requirement, may gain extra bandwidth to improve their throughput. For best-effort traffic, the remaining bandwidth can be used to avoid any possible starvation.
    We build four-dimension Markov chains to evaluate the performance of the proposed ABA algorithm. In the analytical model, we first divide transmission on WiMAX into upload and download phases, and analyze the ABA performance by using Poisson process to generate traffic. At last, by comparing to a previous work, we observe the impacts of different traffic parameters on WiMAX network performance in terms of average delay time, average throughput, and average packet-drop ratio.
    關鍵字(中)
  • 有線網路
  • 馬可夫鏈
  • 服務品質
  • 動態頻寬配置
  • 關鍵字(英)
  • Quality of Services
  • Wired Networks
  • Dynamic Bandwidth Allocation
  • Markov Chains
  • WiMAX
  • 論文目次 第一章 導論 1
    1.1 研究動機 1
    1.2 研究方法 2
    1.3 章節介紹 3
    第二章 WiMAX網路的頻寬配置 4
    2.1 IEEE 802.16 WiMAX的系統架構 4
    2.1.1 WiMAX的資料傳輸方式 4
    2.1.2 WiMAX的傳輸資料類別 5
    2.1.3 取得頻寬的途徑 6
    2.2 WiMAX的頻寬分配方式 7
    2.2.1 Request-Based的頻寬分配 7
    2.2.2 Polling-Based的頻寬分配 8
    2.2.2.1 以Connection導向 8
    2.2.2.2 以Packet導向 9
    2.3 本論文的頻寬配置法 11
    第三章 Adaptive Bandwidth Allocation 13
    3.1 系統架構與傳送資料流的過程 13
    3.2 ABA排程演算法 15
    3.2.1 各類別的最小DR求得方法 17
    3.2.2 針對額外頻寬(Remaining Bandwidth)的DR分配 19
    3.3 建立數學模型 20
    3.3.1 數學模型的假設 20
    3.3.2 馬可夫鏈 21
    3.3.2.1 Uplink暫態轉換機率 22
    3.3.2.2 Downlink的暫態轉換機率 24
    3.3.3 馬可夫鏈狀態轉換機率矩陣 24
    3.4 效能參數 25
    第四章 數學分析與結果 29
    4.1 示範與驗證 29
    4.2 數值結果與效能分析 33
    4.2.1 網路環境參數的設定 34
    4.2.2 負載率的比較 34
    4.2.2.1 rtPS的平均延遲時間 35
    4.2.2.2 nrtPS的平均傳輸率 36
    4.2.2.3 BE的平均封包丟棄率 37
    4.2.3 rtPS延遲時間限制(τ)的比較 39
    4.2.4 nrtPS最低傳輸率需求(α)的比較 41
    4.2.5 Departure Rate (μ)的比較 44
    4.3 增加Q-Aware流量控制門檻的範圍 46
    第五章 結論與未來工作 49
    5.1 結論 49
    5.2 未來工作 51
    參考文獻 (REFERENCES) 53
    索引 (Index)............. 58
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