光突發(fā)交換網(wǎng)絡(luò)中支持QoS的一種競(jìng)爭(zhēng)處理機(jī)制
QoS Supporting Contention Resolution for Optical Burst Switched Networks
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摘要: 分段丟棄是最近提出的一種資源競(jìng)爭(zhēng)解決方法.該文對(duì)尾部丟棄競(jìng)爭(zhēng)處理方法中存在的弊端進(jìn)行了分析.提出了改進(jìn)的頭部丟棄處理方法,該方法是當(dāng)競(jìng)爭(zhēng)重疊部分長(zhǎng)度小于整個(gè)后到的競(jìng)爭(zhēng)突發(fā)數(shù)據(jù)的長(zhǎng)度時(shí)就丟棄后到突發(fā)數(shù)據(jù)的頭部,否則就丟棄整個(gè)后到突發(fā)數(shù)據(jù).為了更好地支持區(qū)分服務(wù)和盡可能地減少錯(cuò)序,該文還提出了基于優(yōu)先級(jí)的混合封裝機(jī)制.仿真結(jié)果證明基于優(yōu)先級(jí)的混合封裝機(jī)制和改進(jìn)的頭部丟棄方法聯(lián)合使用時(shí),對(duì)降低分組丟失率及支持區(qū)分服務(wù)等性能效果很明顯.Abstract: Segment dropping is a novel contention resolution proposed recently. Firstly, the drawback of tail-dropping contention resolution is analyzed in this paper. Then a mod-ified head-dropping policy is proposed. This policy drops the head of contending burst only if the overlapping region of the two bursts is less than the whole contending burst size, oth-erwise drops the whole contending burst. In order to have a better support of differentiated service and alleviate the disorder resulted from head-dropping, a new burst assembly scheme, priority-based mixed burst assembly, is proposed. Such a burst consists of several classes segments, each of which is composed of one or several same class packets and separate head information. The priority of segments is arranged in ascending order in a burst from head to tail. Simulation results show that the proposed scheme performs very well in terms of performance metrics such as the packet loss probability and differentiated services.
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Qiao C,Yoo M.Optical Burst Switching (OBS):A new paradigm for an optical Internet.J High Speed Networks,1999,8(1):69-84.[2]Yoo M,Chunming Qiao,Sudhir Dixit.QoS performance of optical burst switching in IP-over-WDM networks[J].IEEE J.on Selected Areas in Communications.2000,18(8):2062-2071[3]Gauger C,et al..Contention resolution in optical burst switching networks.Advanced Infrastructures for Photonic Networks:WG 2 Intermediate Report,2002:62-82.[4]Vokkarane V M,Jue J P.Prioritized Routing and Burst Segmentation for QoS in Optical BurstSwitched Networks.OFC 2002:221-222.[5]Andrea Detti,Eramo V,Listanti M.Performance evaluation of a new technique for IP support in a WDM optical network:Optical Composite Burst Switching(OCBS)[J].J.of Lightwave Technology.2002,20(2):154-165[6]Yuang M C,et al..QoS Burstification for Optical Burst Switched Networks.OFC 2002:781-783. -
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