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1、RudolfJ.StrijkersUniversiteitvanAmsterdamTheNetworkisintheComputerbyRudolfJ.StrijkersSubmittedtothefacultyofscienceinpartialfulfilmentoftherequirementsforthedegreeofMasterofScienceattheUniversityofAmsterdamMarch2007Supervisor…………………………………………………………………………………….P
2、rof.Dr.R.J.MeijerBoardofExaminers…………………………………………………………………………..Prof.Dr.PetervanEmdeBoasProf.Dr.ChrisR.JesshopeProf.Dr.RobertJ.MeijeriPrefaceTheconceptualmodelofthecurrentInternet,theInternetmodel,isovertwentyyearsold.Itwasdesignedtoprovideend-to-endconnectivi
3、tyevenifmanyroutersandlinkswouldfail.Asaresult,end-usersgetageneric“best-effort“networkservice.Inpractice,usersanddistributedsystemsassumethattheInternetworksjustlikeatelephonenetwork:reliable,constantbit-rateandpredictableQoS.TheInternetworksbecauseIPnetwork
4、sareover-dimensioned,keepingcongestionandlatencyreasonablylow.ThesuccessoftheWWWande-mail,whichhavebecomebasicservicesjustastelephonyandTV,leadsustobelievethatIPcouldtakeoverallothercommunicationforms.Alas,VoIPandbroadcastingservicesdemandQoSguarantees,whicht
5、hestate-of-the-artroutingandnetworkingtechnologiesofIPstillcannotdeliver.Thecurrentsolutionismoreover-dimensioning,resultinginevenlessutilisationofnetworkcapacity.Whenthousandsofwirelesssensordevicesformanetwork,monitoringtheenvironmentswelivein,itisimpractic
6、altoover-dimensionthenetwork.Theremightbehardlyenoughresourcesavailabletocommunicatesensordata.Largesensornetworksarealreadyareality:Londonalonehasanetworkofmorethan150.000surveillancecameras.Inthecaseaneventhappens,afire,acarcrash,orateenagerwithasuspiciousb
7、ackpack,whichsensordataismoreimportant?TheIJkdijkprojectisanefforttobuildadikemonitoringandconditioningsystemusingsensornetworksandalsosetsthecontextoftheacademicquestionsinthisresearch.OneofthechallengesintheIJkdijkprojectishowtoorchestratethemanydifferentty
8、pesofsensordatastreamstogetherwithapplicationdemands,inalargetelecommunicationinfrastructurespanningover40.000kilometresofdikes.Inthesecases,continuouslytuninglocalnetworkbehaviouriscruci
