QoS路由器帶寬公平性算法的改進(jìn)研究.pdf

1、^分類號(hào)密繳重慶郵電大學(xué)碩士學(xué)位論文論文題目Qos路由器帶寬公平性算法的改進(jìn)研究———————————————————————————_——_————————一英文題目一ResearchoftheF—airBandwid—thAllocation—AlgorithmforRouterofth—e—N——e—tw——o—r—k——Q—o—S———————碩士研究生麈繼愛(ài)指導(dǎo)教師塑延堊趲學(xué)科專業(yè)。讓簋扭應(yīng)團(tuán)撼盎論文提交目期一2QQ15論文答

2、辯日期呈塑』：!，口論文評(píng)耀人望l趣童望主盤壁塞聾鱉圈。諏蛐一耋笙塑地蝎答辯委員會(huì)主席耋馥幽遮量2006年4月20日冀痰幫迫走學(xué)硬士論文AbstractWiththefastdevelopmentofnetworktechnologiesandtheincreasingscaleofnetwork，traditionalIPnetworkcailonlyprovide”BestEffort”serviceandcantsatisfydi

3、fferentnetworktrRXticqualityrequimmemsofmultimediaapplicationsorallkindsofusersAmongthesharednetwork，fairnessisinescapablyemergedFairbandwidthallocationamongflowsisanimportantissueofnetworkQoS(QualityofService)。Themechan

4、ismsbasedontheSOllrcenodeandOnthemiddlenodeareusedtosolvethefaimessproblemsFairbandwidthallocationmechanismsbasedonendpointareeasytObeimplemented，buttherea轉(zhuǎn)problemswithfairnessandnoncompliantsourcesConsequentlyfaimesspro

5、blemsCannotbesolvedonlybydependingonTCPcongestioncontrolwhichisimplementedinsourcenodeRoutersshouldactivelyplayanimportantroleinfairnessbandwidthallocation。Atpresent，threeapproachesareusedtoachievefairbandwidthscheduling

6、namelyperflowdroppingalgorithmscheduling，perflowdroppingalgorithmandstatelessfairqueuingalgorithmTheformertwoschemesusuallyrequirethattheintermediatednetworknodemaintainsomestateforeachflowpassingthroughitandperformsperf

7、lowoperationThiscauseshigherimplementationcomplexityandbadsealabili夠ThelateravoidtheuseofperflowinformationandavoidperflowprocessingintheinteriorofanetworkdomainInthisthesis，wefollowthesamearchitectureofCSFQ(CoreStateles

8、sFairQueuing)，proposedbyIStoicsetal，thatcarlapproximatefairqueuingwithoutpevflowstateandperflowprocessingincoreroutersHowever，itsdroppingalgorithmisderivedfromnonresponsiveflowssuchasUDPflOWSanddoesnotsuitTCPflowsInaccor

9、dancewiththedrawback，weproposedamethodthatcanenhanceCSFQalgorithmwhichdynamicallyCallregularthedroppingprobabilitybasedonnetworkconditionamongTCPflowsandUDPflowsWithsimulationexperimentswefoundthatourmodifiedCSFQalgorith