https://scholars.lib.ntu.edu.tw/handle/123456789/152206
Title: | IP over WDM 網路中具服務品質保證及群播技術之研究(2/2) | Authors: | 廖婉君 | Keywords: | 分波長多工光纖網路;全光網 路;群播;Optical Burst Switching (OBS);WDM;differentiated service;wavelength reservation | Issue Date: | 31-Jul-2005 | Publisher: | 臺北市:國立臺灣大學電機工程學系暨研究所 | Abstract: | 本年度計畫主要研究分波長多工全光 網路(WDM all-optical networks)中品質保 證演算法的設計。我們所針對的環境是 OBS 為基礎之全光網路,目前相關研究成 果如JET 機制大都只能在網路不壅塞的環 境下運作,一旦網路壅塞,這類作法將退 化成無程級的機制。在本年計畫中我們提 出演算法改進此缺點,藉由模擬驗證,我 們所提出的演算法有較低的阻斷機率及較 好的資源使用率。此外,我們亦分析所提 出的演算法在壞情況下之效能。 This project proposes a preemptive multiclass wavelength reservation protocol to provide differentiated service for Optical Burst Switched (OBS) networks, without requiring buffers at the WDM layer. Unlike existing approaches, such as JET QoS, which suffer from implementation constraints and which may degrade to classless schemes, our mechanism is robust and supports an incremental deployment of QoS support and cooperates well with other “best-effort” reservation mechanisms like Horizon and the original JET. We maintain a usage profile for each class at the router, and implement a preemptive wavelength reservation algorithm to ensure QoS. We also conduct simulations to evaluate performance. The result shows that our approach performs best in terms of lower blocking probability and higher resource utilization, making our approach an excellent QoS mechanism for OBS networks. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/8029 | Other Identifiers: | 932213E002032 | Rights: | 國立臺灣大學電機工程學系暨研究所 |
Appears in Collections: | 電機工程學系 |
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932213E002032.pdf | 116.88 kB | Adobe PDF | View/Open |
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