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1、Chapter1ENERGY-EFFICIENTDATAMULTICASTINMULTI-HOPWIRELESSNETWORKSJenniferL.Wong,GiacaminoVeltriandMiodragPotkonjakDepartmentofComputerScienceUniversityofCalifornia,LosAngelesLosAngeles,CA,US90095Abstract:Multi-hopwirelessnetworks(MHWNs)areanemergingpar
2、adigmforbandwidthandenergy-efficientwirelesssystemswhereeachterminalcommunicatesonlywithafewcloselypositionedneighbornodesusinglowpowercommunicationschemes.High-rate(multimedia)datanetworks,sensornetworks,andvoicecommunicationsareseenasthreemainapplic
3、ationdomainsofMHWNs.WhileMHWNsopenmanynewresearchandeconomicopportunities,theysimultaneouslyposeanumberofnewchallengingtechnicalproblems.Amongthem,thefundamentalroleisreservedforenergy-efficientdatadelivery.WeaddresstheproblemofDataMulticastinMulti-Ho
4、pWirelessNetworksthateffectivelycapturesrequirementsofallthreeofthescenarios.Theproblemfocusesonhowtominimizeenergyconsumptionwhiledeliveringdatatoallconsumersthatrequestedit.Sinceinthecurrentandpendingtechnologiescommunicationdominatesenergyconsumpti
5、on,weaimtominimizethenumberofnodesthattransmitdatafortherequestdatadeliveryprobleminstance.First,weformulatetheproblemandestablishitscomputationcomplexity.Next,wedevelopanefficientheuristicwhichutilizesinformationaboutthegeographicalpositionofthenodes
6、inthenetworktofindthemostenergy-efficientcommunicationpath.Finally,weestablishtheeffectivenessoftheproposedapproachbyconductingcomprehensivetestingofourheuristicontypicalad-hocnetworksandinstances.Keywords:WirelessAd-hocNetworks,Multi-HopNetworks,Sens
7、orNetworks,DataDissemination.12Chapter11.IntroductionInthelastdecade,thecontinuoushighpaceoftechnologicaladvanceshasenabledtheexponentialgrowthoftheInternet.Wecantracethedevelopmentoftwoimplementationtechnologiesasprimeenablersofthisgrowth.Thefirstist
8、hedramaticreductioninthecostofdisks,ormassivepermanentstorage.Thesecondisthehugereductioninthecostofopticalcommunicationandsimultaneouscapacityincrease.Forexample,thecapacityofahundreddollardiskincreasedbyfactorof1,200timesinthelastelevenyears
