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1、356IEEETRANSACTIONSONMULTIMEDIA,VOL.3,NO.3,SEPTEMBER2001AnImprovedUDPProtocolforVideoTransmissionOverInternet-to-WirelessNetworksHaitaoZheng,Member,IEEE,andJillBoyce,Member,IEEEAbstract—Packetvideowillbecomeasignificantportionofemergingandfuturewireless/Internettraffic.Howeve
2、r,networkcongestionandwirelesschannelerroryieldstremendouspacketlossanddegradedvideoquality.Inthispaper,weproposeanewcompleteuserdatagramprotocol(CUDP),whichutilizeschannelerrorinformationobtainedfromthephysicalandlinklayerstoassisterrorrecoveryatthepacketlevel.Weproposesever
3、almaximaldistanceseparable(MDS)code-basedpacketlevelerrorcontrolcodingschemesandderiveanalyticalformulastoestimatetheequivalentvideoframelossfordifferentversionsofuserdata-gramprotocol(UDP).WevalidatetheproposedpacketcodingandCUDPprotocolusingMPEG-codedvideoundervariousIntern
4、etpacketlossandwirelesschannelprofiles.TheoreticandsimulationresultsshowthatthevideoqualitycanbesubstantiallyimprovedbyutilizingtheframeerrorinformationatUDPandapplicationlayer.IndexTerms—Forwarderrorcorrection,packetloss,protocols,videocoding,wirelessnetworks.I.INTRODUCTIONN
5、TERACTIVEandnetwork-basedmultimediaapplicationsIsuchasvideo,image,andaudioarebeingusedincreasinglybothintheInternetandoverwirelesschannels.GiventheFig.1.Internet-to-wirelessmultimediacommunications.successofdigitalcellularnetworks,itisinevitablethatfuturewirelessserviceswills
6、upportInternetProtocol(IP)-basedyieldspacketloss.Atthereceivinghost,packetsareeithermultimediaapplications[1],[2].Typicalapplicationsincludeperfectorcompletelylost.mobileinternetaccess,mobilevideoconferencing,streamingIncontrast,wirelesspacketnetworksarecharacterizedasvideo/a
7、udio,distancelearning,e-commerce,entertainment,low-bandwidthandunreliable,inwhichaconsiderableamountetc.Particularly,inanInternet-to-mobiletrafficflowscenario,ofpacketlossesareinducedbybothchannelfailureandnetworkasshowninFig.1,themultimediapacketsarefirstsentcongestion.Depen
8、dingontheenvironment,movingspeed,throughInternetandthenoverwirelessp
