本篇論文針對在目前接取網路中新興的三合一整合型網路服務，提出了一個延遲限制的服務品質保證頻寬分配演算法。本演算法採用一個固定傳輸訊框方法使得即時性服務可在每一個傳輸訊框中去保留足夠的頻寬，藉此來滿足即時性服務所需求的傳輸品質，如延遲變量或延遲上限保證等。如此本演算法就能提供即時性資料有更好的傳輸品質保證。此外，本演算為了防止飢餓現象發生在盡量服務的資料傳輸上，因此在每一個傳輸訊框中保留最小頻寬使得盡量服務的資料不會因為即時性資料而無限延遲傳輸，使得延遲時間大幅上升。再者，本演算可以針對網路上不同使用者的回報需求，動態地調整即時性資料和盡量服務的傳輸界線位置，使之更可以有效地利用頻寬，提高頻寬的使用率。最後，電腦模擬結果顯示出本演算法比起其他的服務品質演算法，在產能、延遲變量以及延遲上限的保證中，皆能呈現較好的效能成果。

This thesis proposes a Delay-Constrained Scheme for supporting the triple-play services in EPON networks. The proposed scheme adopts a fixed frame approach. In each frame, a mechanism is provided to enable real-time traffic to reserve sufficient bandwidth and control the delay variation to meet its transmission needs. In this manner, the proposed scheme can provide the necessary requirements, such as the guaranteed of the delay variation and delay bound for real-time traffic. Additionally, because the proposed scheme reserve the minimum bandwidth for the BE traffic, the BE traffic can be prevent from starvation. Furthermore, the proposed scheme can dynamically adjust transmission boundary between the real-time and the BE traffic according to the various requests of the subscribers. Finally, computer simulations have shown that the proposed scheme can have better performance than other QoS schemes in terms of throughput, jitter and delay bound.

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