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1、LearningjournalonmultimediastreamingoverwirelesscommunicationI.IntroductionRecently,wirelesssensornetwork(WSN)hasbeenoneofthehottopicsintheITresearcharea.WSNsenablelargerscalenetworksofsensornodescapableofsensingreal-timeinformation,suchastemperature,pressu
2、re,humidity,orlocationofobjects,fromtheenvironment,processthesenseddataandtransmitthroughwirelesscommunicationittotheremotelocation.[3]However,withtheincreasingdemandofvariousapplicationsanddiverseinformation,collectinginformationintheformofmultimediasuchas
3、audio,image,andvideoisneeded.Therefore,itaddressesadditionalchallengesduetotheuniquerequirementsofmultimediastreamsdeliveryoverWSN,resultinginthedistributed,networkedsystems,referredaswirelessmultimediasensornetworks(WMSNs).[1]Throughreviewingsomerelatedart
4、icleintheliterature,IgraspafundamentalunderstandingofthenewconceptofWMSN,tobemorespecifically,theframeworkoftheprotocolstack,thecurrentstatusoftheliteratureonthemultimediastreamingoverWSNs,presentproposedsolutionsofprotocolsateachlayer,andcross-layerapproac
5、hestooptimizetheperformancesofmultimediacommunication.BelowIdiscussthechallengesandsolutionswiththeirprosandcons.Finally,mypersonalfeelingsandideasoverthisissuearesummarized.II.FrameworkoftheprotocolstackFigure1TraditionalframeworkofprotocolsinaWSN1.Physica
6、lLayerMultimediastreamsflowatthislayerintheformofradiowaves.Duetothelargeamountofdatacommunicationofmultimediacontent,theUltra-Wideband(UWB)technologyispreferredhereforitslowpowerconsumptionandhighdata-ratecommunicationinlocalsmallareas.Moreover,itswideband
7、widthpromisesfineresolutionforaccuratepositioninginhighdenseclutteredenvironment.I’vebeenfamiliarwithUWBsinceIjointasimilarprojectofpreciseindoorpositioningusingUWBtechnologyinNanyangTechnologicalUniversity,Singapore.ThereIexploredanddonesomesimulationthefi
8、rst-pathtimeofarrival(ToA)signaldetectioninadensemultipathenvironment.1.MAC(Link)LayerThetwomainfunctionsoftheMAClayerarearbitrationofthechannelandprovidingerrorandrecoveryschemes.Thetwomainchannelacce
