本論文研究著重以光纖網路為基礎之光接取網路 (Optical-based Access Network) 為主要探討之網路架構，其中包含短距離和長距離乙太被動式光纖網路 (Short-Reach and Long-Reach Ethernet Passive Optical Networks，簡稱SR-/LR-EPONs)、整合式光纖/無線接取網路 (Integrated EPON/Broadband Wireless Access Networks，簡稱Integrated EPON/BWAN)，討論在光纖接取網路上對效能影響甚鉅的相關議題。
在本博士論文的第一部分會討論如何在光纖接取網路上支援私有網路的服務溝通 (Private Networking Communications)。在眾多接取網路架構中，樹狀拓樸的乙太被動式光纖網路 (Tree-based EPONs) 為寬頻接取網路技術中最為穩定且成熟的網路架構之一。這是因為tree-based EPON的網路架構利於網路業者實現對網路使用者的廣播服務應用卻無法直接支援點對點的直接傳輸 (或稱私有網路溝通傳輸)。這是由於傳統樹狀的EPON只允許資料訊號在光纖線路終端器 (Optical Line Terminal，簡稱OLT 和光纖網路單元 (Optical Network Unit，簡稱ONU) 之間傳輸。這限制使得網路業者無法有效率地使用網路頻寬而導致整體的網路效能下降。再者，若將網路架構換成樹狀長距離EPON (tree-based LR-EPON) 架構，則整體的網路效能會變得更糟，因為tree-based LR-EPON的OLT和ONU之間距離大幅拉長，使之可以涵蓋更大的範圍，若要進一步在此LR-EPON上提供私有網路溝通傳輸，這個限制 (即限制資料只能在OLT和ONU之間傳輸的限制) 更會使得網路頻寬的使用率進一步大幅下降，進而整體網路效能亦會大幅下降。因此，本論文提出全新的網路架構以及相對應的動態頻寬分配 (Dynamic Bandwidth Allocation，簡稱DBA) 演算法分別去達成在樹狀之SR-和LR-EPON架構上支援私用網路資料 (Private Networking) 的傳輸。同時，本論文亦提出一個效能分析模型估算其演算法效能。最後，由模擬得知，本論文所提出效能分析模型得到的結果與電腦模擬實驗吻合，藉此證明本研究所提出的效能分析模型的正確性及準確性。
在第二部分，本論文研究在傳統的EPON網路上支援三合一資料 (Triple-Play Services) 傳輸並同時滿足其嚴格的服務品質 (Quality of Service，簡稱QoS) 需求。因此，本論文提出一個以固定時框為基礎的DBA演算法支援並滿足triple-Play資料的QoS傳輸。再者，為了提供在EPON上所有方向上 (例如資料封包的目的端位址可為在或不在本地網路上) 的triple-play資料傳輸，本論文所提出的以固定時框為基礎的DBA演算法為每一個方向保留足夠的頻寬去支援傳輸並滿足triple-play的傳輸服務品質需求。同時，本論文亦根據M/G/1排隊理論提出一個相對應的分析模型去驗證所提出的DBA演算法的效能。
本博士論文的第三部分是探討如何有效地整合式乙太被動式光纖網路/寬頻無線存取網路，使之成為一個固定網路與移動網路融合 (Fixed Mobile Convergence，簡稱FMC) 之網路架構。由於這兩個相異網路特性之間的互補性，使得網路業者可以高頻寬和低成本的方式擴展和部署網路。然而，雖然目前的研究已提出很多相關的硬體架構，但是針對如何將EPON的頻寬有效率地分配給有線EPON和無線BWAN網路仍然是一個待解決的問題。因此，本論文提出一種新穎的DBA演算法使得相異網路協定之間可以順利並有效率的結合，以分別提供網路服務給有線與無線使用者。最後，本論文會基於M/G/1排隊模型理論提出一個分析模型來評估所提出的DBA演算法的效能，其結果與電腦模擬數值結果相互驗證證實該DBA演算法的效率和效益。
最後，本論文的第四個部分主要討論在LR-EPON上大幅增加的傳輸距離對網路傳輸效能造成的影響。由於LR-EPON可以大幅簡化都會網路和區域網路的網路架構，因此LR-EPON已經成為一個具有前瞻性的網路架構之一。然而，大幅增加的傳輸距離卻會使得傳統以交錯輪詢為基礎的DBA演算法的效能大幅下降。為了解決此問題，本論文於分波多工LR-EPON 提出了一個基於ONU端的分散式DBA演算法。最後，透過一系列的電腦模擬證實本研究的所提出的分散式演算法的效能。

This dissertation is aimed at addressing critical issues in the optical-based access networks including of Short-Reach Ethernet Passive Optical Networks (SR-EPONs), Long-Reach EPONs (LR-EPONs), and Integrated EPON/Broadband Wireless Access Networks (BWANs).
The first part of the dissertation is to discuss the issue of supporting private networking over the optical-based access networks. It is known that the tree-based EPONs have been regarded as a cost-effective network architecture for easily implementing and achieving the broadcast transmissions. However, the tree-based EPONs are not suitable for realizing the point-to-point transmissions (or called private networking) since the signal path is only restricted between the Optical Line Terminal (OLT) and the Optical Network Units (ONUs). In order to support the private networking in the optical-based access networks, the current dissertation proposes new network architectures to achieve the private networking in the tree-based EPONs. Furthermore, the corresponding Dynamic Bandwidth Allocation (DBA) schemes are proposed to fully utilize the network bandwidth. Meanwhile, the corresponding analytical frameworks are proposed to investigate the proposed DBA schemes. The analytical and simulation results are found to be in good agreement with each other.
The second part of the dissertation is to investigate the so-called triple-play services (Voice over IP, video and BE traffic) in the EPON-based access networks. Since the conventional EPONs perform poorly in supporting differentiated services and therefore fail to meet the Quality of Service (QoS) demands, this dissertation proposes a frame-based DBA scheme to satisfy the QoS requirements of each traffic type of triple-play services. Meanwhile, based on M/G/1 queueing model, this study develops an analytical model for evaluating multiuser cyclic polling system to derive the closed-form expressions for the network performance metric such as mean packet delay. A series of comparisons between the numerical and analytical results are performed to show the validity of the proposed frame-based DBA scheme.
The third part is to discuss the issue of the integration of EPON and the Broadband Wireless Access Networks (BWANs). Since the complementary features of these two network systems provide high bandwidth and mobility together with a low deployment cost, the problem of achieving an effective bandwidth division among the EPON and wireless traffic remains unresolved. The dissertation proposes an effective-bandwidth-division DBA scheme to accommodate the bandwidth sharing between the EPON and BWAN. Also, this study develops an N-user queueing model based on M/G/1 queueing model to evaluate the efficiency and the effectiveness of the proposed DBA scheme.
The fourth part of this dissertation is to discuss the effect of the increased propagation delay in LR-EPONs. It has no doubt that the increased propagation delay has led increased idle time for interleaved-based DBA schemes resulting in poor bandwidth utilization. Thus, the dissertation proposes a DBA scheme based on a decentralized manner over a WDM LR-EPON. In this scheduling scheme, the current study uses an Array Waveguide Grating (AWG) module to enable decentralized scheduling among all ONUs such that the network utilization is not degraded by the increased propagation delay. Finally, computer simulations are performed to compare with existing DBA schemes to verify the effectiveness and efficiency of the proposed DBA scheme.

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