简介:Becauseofrapiddevelopmentinnetworktechnology,Internetusagehasbecomewidespread.Itallowsuserswithsensingdevicestoobtainmedicaldataforhealthcare,suchasphysiologicalsignals,voice,andvideostreamsfromtelemedicinesystems,andtosendthehealthcaredatatoback-enddatabasesystems,creatingaubiquitoushealthcareenvironment.However,thisenvironmentrequiresawidespreadandsuitablenetwork.IPv6(Internetprotocolversion6)isthenext-generationInternetprotocolthatwillbetheprotocoloffuturenetworks;itimprovesmanyshortcomingsofIPv4.Inthispaper,weproposeanIPv6/IPv4U-home-caretestsystemandanalyzethenetwork’sparametersthoughaseriesoftestsbyadjustingnetworkparameterstofindtheoptimaldesignforapplicationsintheIPv6/IPv4U-home-careservicesoastoassuregoodperformanceandhighquality.
简介:Thispaperproposesanewqueuingmodelandadaptiveschedulingschemewhichrealizesmulti-classQoSmechanismunderDiffServarchitecture.Thequeuingmodeliscomposedoftwoparalleloutputsubqueues,eachoutputsubqueueadoptsrandomdropalgorithmbysettingdifferentbufferthresholdfordifferentclasstraffic,soitcanprovidemulticlassQoS.Thenewproposedschedulingschemewhichadaptivelychangestheparameterλcanguaranteetheperformancetargetofhighclasstraffic,inthemeantime,improvetheQoSoflowclassestraffic.
简介:Withtheadventoflarge-scaleandhigh-speedIPv6networktechnology,aneffectivemulti-pointtrafficsamplingisbecominganecessity.Adistributedmulti-pointtrafficsamplingmethodthatprovidesanaccurateandefficientsolutiontomeasureIPv6trafficisproposed.TheproposedmethodistosampleIPv6trafficbasedontheanalysisofbitrandomnessofeachbyteinthepacketheader.Itoffersawaytoconsistentlyselectthesamesubsetofpacketsateachmeasurementpoint,whichsatisfiestherequirementofthedistributedmulti-pointmeasurement.Finally,usingrealIPv6traffictraces,theconclusionthatthesampledtrafficdatahaveagooduniformitythatsatisfiestherequirementofsamplingrandomnessandcancorrectlyreflectthepacketsizedistributionoffullpackettraceisproved.