WiMAX (Worldwide Interoperability for Microwave Access) 提供了大都會區傳輸範圍較廣且高頻寬的網路服務，然而在IEEE 802.16 裡，並沒有定義出SS(Subscriber Station) 選擇則路徑的方法，因此SS 如何替眾多使用者找到路徑將資料上傳到BS (Base Station)，就成為了值得研究的問題。在本論文中，我們提出了Optimal Route Selection Schemes (ORSS) 機制來選擇路徑，並考量了三項影響因素，SS 可能分配到的頻寬、SS 四周干擾點數還有距離BS 的Hop 數目。我們還將QoS (Quality of Service) 加入Mesh Mode 裡面，在MN (Mobile Node) 是傳送rtPS (real-time Polling Service) 資料類別時，SS 只需要與相同Level 同樣是傳送rtPS 資料類別的SS 共用頻寬，而不是傳送rtPS 資料類別的SS 則必須和所有相同Level 的SS 共用頻寬，並且我們也預估出路徑的Delay，確保所選擇路徑能滿足rtPS 的頻寬和Delay 的要求。
我們建立數學模式來分析當MN 是傳送rtPS 資料類別的路徑選擇法，並且改變不同的網路參數來討論選擇路徑的成功率。我們定義出Level、Brother 和Relay 矩陣並使用Matlab 來驗證我們的路徑選擇公式，最後的結果也證明我們的機制相較於其他人的機制，能夠更有效的尋找到一條適合rtPS 資料傳輸的路徑並且確實滿足MN 的要求。

WiMAX (Worldwide Interoperability for Microwave Access) provides wide
transmission range and broadband network services. However, in IEEE 802.16
standard, there is no specific definition for SS (Subscriber Station) to select an
optimal route in a mesh-based WiMAX network. In this thesis, we propose an
Optimal Route Selection Scheme (ORSS) for SS to select a route to its BS (Base
Station). ORSS basically considers three influential factors, the bandwidth SS to be
assigned, the number of interference nodes around SS, and the hop counts to BS. We
also investigate QoS (Quality of Service) issue in a mesh-based WiMAX network; an
SS transferring the rtPS traffic type will share bandwidth with the neighboring SS of
the same level that transmit the same traffic type. To ensure the selected route that can
meet the bandwidth requirements of rtPS and the delay constraints, we estimate the
average transmission delay from SS to BS. For the purpose of evaluation, we establish
a mathematical model to analyze the proposed ORSS and discuss the impact of
varying network parameters on the successful rate of route selection. Through the
Matlab simulation, we validate our mathematical model. The simulation results
demonstrate that our ORSS, in comparison to a previous work, is more effective in
ensuring the delay constraints when selecting a route to transfer rtPS traffic.

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 Mesh Networks 上的路徑選擇法...............................4
2.1 WIMAX 網路之架構..........................................................................................4
2.2 在MESH MODE 下選擇路徑的相關研究...........................................................7
2.2.1 Centralized Routing ......................................................................................7
2.2.2 Distributed Routing.......................................................................................8
2.3 本論文的MESH MODE 路徑選擇.....................................................................10
第三章 路徑選擇法.................................................................................11
3.1 系統運作流程...................................................................................................11
3.2 數學模式的建立...............................................................................................14
3.2.1 數學模式的假設........................................................................................14
3.2.2 路徑選擇法的建立....................................................................................14
3.2.3 BS 分配頻寬的方式...................................................................................17
3.2.4 傳送rtPS 資料的限制...............................................................................18
第四章 結果與分析................................................................................20
4.1 路徑選擇的求解...............................................................................................20
4.2 數值結果與分析...............................................................................................21
4.2.1 不同Level 的影響....................................................................................22
4.2.2 不同頻寬要求 (BR) 的影響....................................................................23
4.2.3 不同SS 總數的影響...............................................................................25
4.2.4 時間複雜度和計算....................................................................................26
第五章 結論與未來工作......................................................................27
5.1 結論...................................................................................................................27
5.2 未來工作...........................................................................................................29
References ................................................................................................30
索引 (Index) ............................................................................................34

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