臺灣博碩士論文加值系統

Ethernet Passive Optical Network (EPON) has been considered as a promising solution for next-generation broadband access networks due to its low cost, simplicity, and scalability. A critical issue of EPONs is bandwidth allocation of the shared upstream channel between end users. Some bandwidth allocation schemes based on interleaved polling have been proposed. However, none of them outperforms the others under all traffic loads. The credit-based scheme has an edge over the others in the case of light load, while the limited scheme prevails in the case of heavy load. We propose a new credit-based bandwidth allocation scheme that performs well under all traffic loads. In the proposed scheme, the size of the credit is dynamically determined by the OLT (Optical Line Terminal) according to each ONU''s (Optical Network Unit''s) traffic situation and the entire system load. Besides, the OLT has a maximum transmission window size limit for each ONU. Every ONU can transmit data up to the maximum window size per cycle. Simulation results verify that our proposed scheme has impressive performance under all traffic loads.

Acknowledgements i
Abstract ii
Contents iii
List of Figures iv
List of Tables vi
1 Introduction 1
2 Background and Related Research 5
2.1 Passive Optical Network 5
2.1.1 WDMA PON 7
2.1.2 TDMA PON 8
2.2 Ethernet Passive Optical Network 8
2.3 Multi-Point Control Protocol 10
2.4 Dynamic Bandwidth Allocation 11
2.4.1 Polling Policies 12
2.4.2 IPACT 14
2.4.3 Dynamic Bandwidth Allocation Schemes 19
3 Problem Statement and Proposed Scheme 22
3.1 Problem Statement 23
3.2 Proposed Scheme 26
4 Simulation Results and Discussions 31
4.1 Simulation Model 32
4.2 Simulation Results and Discussions 33
4.2.1 Simulation Results of ONUs with Identical Load 34
4.2.2 Simulation Results of Tagged ONU under Various System Loads 40
5 Conclusion 59
References 60

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[22]http://wwwcsif.cs.ucdavis.edu/~kramer/code/trf_gen3.html