在乙太被動光纖網路中以平均為標準的動態頻寬分配演算法

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研究生：	陳秉毅 Bing-Yi Chen
論文名稱：	在乙太被動光纖網路中以平均為標準的動態頻寬分配演算法 Average Based Dynamic Bandwidth Allocation in Ethernet Passive Optical Network
指導教授：	李端興 Duan-Shin Lee
口試委員:
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 資訊工程學系 Computer Science
論文出版年：	2005
畢業學年度：	93
語文別：	英文
論文頁數：	29
中文關鍵詞：	乙太被動光纖網路、動態頻寬分配
外文關鍵詞：	EPON, DBA, MPCP
相關次數：	點閱：2 下載：0
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近年來，骨幹網路和一般使用者的區域網路都拜技術提昇所賜，在速度和效能上，都有了相當程度的提升。然而在兩段網路中介的接取網路卻沒有大幅度的改善和更新，以致於接取網路已經漸漸的成為了網路效能的瓶頸之一。目前比較通用的接取網路架構像是數位用戶迴路（DSL）、纜線數據機（Cable Modem），都無法完全的滿足越來越大量的網路頻寬需求。因此，接取網路段的技術提昇，已經成為目前最迫切需要改善的議題之一。
乙太被動光纖網路（EPON）在許多的提案中被視為下一代寬頻接取網路的一個相當具有吸引力的方案，相關的技術探討也被許多學界和業界的學者先進熱烈的討論。在許多研究方向中，頻寬分配的問題是在乙太被動光纖網路中的一個關鍵性議題。因此，在這份論文中，我們使用動態頻寬分配的概念設計了一個公平且有效的方法。而其中，網路的傳輸是由在IEEE 802.3ah專案工作小組中所制訂的控制訊息以插敘的方式來支配。而我們提出的動態頻寬分配的演算法同時也支援了不同的網路應用服務，並且消除了由於乙太網路封包的不可分割性所造成的頻寬浪費。另外，為了將特定網路串流的服務品質這個議題納入考量，我們也在提出的演算法中增加了一些合理的改善以符合需求。在最後，我們也對提出的演算法做了詳盡的效能評估。

Ethernet passive optical network (EPON) has been considered as an attractive solution for next-generation broadband access networks. Bandwidth distribution problem is a critical issue of EPON system. In this study, we design a fair and effective scheme with dynamic bandwidth allocation. The transmission is dominated by the interleaved control messages defined within the IEEE 802.3ah Task Force. The DBA scheme is also designed to support differentiated services and to eliminate the bandwidth wastes owing to the indivisibility of Ethernet frames. Considering the quality of service (QoS) issues of specific traffic flow, we perform some feasible improvement of the scheme we proposed. Detailed simulations are performed to verify the effectiveness of our DBA algorithm.

Contents

Abstract    I
Contents    II
List of Figures    III
List of Tables    IV
1 Introduction    1
2 System Model and Related Works    4
2.1 EPON System Model Description    4
2.2 Related Works    7
3 Proposed Scheme    8
3.1 Average Based DBA scheme    8
3.2 Extensions of the Proposed scheme    13
3.2.1 Second Boundary Concept    13
3.2.2 Jitter Performance Improvement    14
4 Simulation Results    18
4.1 Performance Evaluation compared with IPACT    18
4.2 Performance Evaluation of DBA1 and the Extensions    21
5 Conclusions    28
6 References    29

List of Figures

Figure 1. EPON access network.    5
Figure 2. Priority Sequence of the Average Based DBA Scheme.    10
Figure 3. Chaining Data Structure of the Requests in OLT.    11
Figure 4. Illustration of 2 sub-cycle arrangement.    16
Figure 5. Average packet delay for DBA1 and IPACT.    19
Figure 6. Average packet delay of three queues for DBA1 and IPACT.    20
Figure 7. System Utilization of DBA1 and IPACT.    21
Figure 8. Average packet delay of DBA1 and the extensions.    22
Figure 9. Average delay of GF queue of DBA1 and the extensions.    22
Figure 10. System utilization of DBA1 and the extensions.    23
Figure 11. Transmission interval of DBA1.    24
Figure 12. Transmission interval of DBA2.    24
Figure 13. Transmission interval of DBA3.    25
Figure 14. GF buffer occupancy of DBA1.    26
Figure 15. GF buffer occupancy of DBA2.    26
Figure 16. GF buffer occupancy of DBA3.    27

List of Tables

Table 1. Boundaries of transmission interval and guard time overhead.    17
Table 2. Simulation Parameters and Assumptions.    18

                                

6 References

[1] G. Kramer, G. Pesavento, “Ethernet Passive Optical Network (EPON): Building a Next-Generation Optical Access Network”, IEEE Communication Magazine, 66-73, February 2002.
[2] G. Kramer, B. Mukherjee, G. Pesavento, “Interleaved Polling with Adaptive Cycle Time (IPACT): A Dynamic Bandwidth Distribution Scheme in an Optical Access Network”, Photonic Network Communication, 4:1, 89-107, 2002
[3] C. M. Assi, Y. Ye, S. Dixit and M.A. Ali, “Dynamic Bandwidth Allocation for Quality-of-Service Over Ethernet PONs”, IEEE JSAC, Vol. 21, No. 9, pp. 1467-1477, 2003.
[4] A. Shami, X. Bai, C. M. Assi, N. Ghani, “Jitter Performance in Ethernet Passive Optical Networks”, IEEE Journal of Lightwave Technology, Vol. 23, No. 4, 1745-1753, APRIL 2005.
[5] S.-I. Choi, “Cyclic polling-based dynamic bandwidth allocation for differentiated classes of service in Ethernet passive optical networks”, Photonic Network Communications, 7:1, pp. 87–96, 2004.
[6] IEEE 802.3ah Ethernet in the First Mile Task Force. Home Page is available at http://www.ieee802.org/3/efm
[7] S. Blake, D. Black, M. Carlson, E. Davies, Z. Wang, and W. Weiss, An Architecture for Differentiated Services, IETF, RFC 2475, Dec. 1998.

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