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.
简介:多播提供了一种以一对多的方式发送数据的有效通信机制,它没有为上层提供任何服务质量和投递保证。为了提高其可靠性,设计了大量的可靠多播协议,但设计一种适合各种应用情况的多播协议是不可能的。文中针对C/S架构、在双机热备系统中,设计了一种简单弹性可靠多播协议(SFRM)。