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WiMAX网络中基于优先级的视频分组调度算法.docx

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WiMAX网络中基于优先级的视频分组调度算法 Abstract WiMAX（WorldwideInteroperabilityforMicrowaveAccess）isawirelessbroadbandaccesstechnologywhichiswidelyusedinmoderncommunicationsystems.Inordertoensurethequalityofservice(QoS)ofvideotransmissionoverWiMAXnetworks,aprioritizedvideopacketschedulingalgorithmisproposedinthispaper.Theproposedalgorithmassignsdifferentprioritylevelstovideopacketsaccordingtotheirimportanceandurgency,andthenschedulesthepacketsaccordingtotheirprioritylevels.ThesimulationresultsshowthattheproposedalgorithmcaneffectivelyimprovetheQoSofvideotransmissioninWiMAXnetworks. Introduction Withtherapiddevelopmentofwirelessbroadbandaccesstechnologies,WiMAXtechnologyhasbecomeoneofthemostpromisingtechnologiesforwirelesscommunicationsystems.WiMAXisabroadbandwirelessaccesstechnologybasedontheIEEE802.16standard,whichcanprovidehigh-speeddatatransmissionoverawideareawithlargecoverage.However,thetransmissionofvideodatainWiMAXnetworksisfacingsomeseriouschallenges,suchaschannelnoise,packetloss,delayandjitter.Thesechallengesmakeitdifficulttoensurethequalityofservice(QoS)ofvideotransmissionoverWiMAXnetworks. PacketschedulingisanimportanttechniqueforimprovingtheQoSofvideotransmissioninWiMAXnetworks.Packetschedulingalgorithmsdeterminetheorderinwhichpacketsaretransmittedoverthenetwork,aimingtominimizethedelay,jitter,andpacketloss.AvarietyofpacketschedulingalgorithmshavebeenproposedforWiMAXnetworks,suchasround-robin,proportionalfair,minimummeandelay,andmaximumthroughputschedulingalgorithms.However,thesealgorithmsdonottakeintoaccountthecharacteristicsofvideodata,suchastheimportanceandurgencyofvideopackets. Inthispaper,aprioritizedvideopacketschedulingalgorithmisproposedforWiMAXnetworks.Theproposedalgorithmassignsdifferentprioritylevelstovideopacketsaccordingtotheirimportanceandurgency,andthenschedulesthepacketsaccordingtotheirprioritylevels.ThesimulationresultsshowthattheproposedalgorithmcaneffectivelyimprovetheQoSofvideotransmissioninWiMAXnetworks. PrioritizedVideoPacketSchedulingAlgorithm The