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1、AFlexibleAirInterfaceforIntegratedBroadbandMobileSystemsAndréNollBarreto*,MichaelMecking=andGerhardFettweis**DresdenUniversityofTechnologyMobileCommunicationsSystems,01062,Dresden,Germany,Tel:+493514632790/Fax:+493514637255e-mail:{noll,fettweis}@ifn.et.tu-dresden.de=MunichUniversityofTechnologyArc
2、isstr.21,D-80290Muenchen,Germany,Tel:+4989289-23089/Fax:+4989289-23490e-mail:Michael.Mecking@ei.tum.deAbstract-Inthispaperwepresentaflexibleairinterfaceincreaseinthesignal-to-noiseratioandtothereductionofforanIntegratedBroadbandMobileSystem,whichintersymbolinterference.However,smartantennasareutil
3、isesadaptiveantennaarraysinthreeconfigurations.expectedtobeemployedonlyforslowmovingmobiles,Thesecorrespondtodifferentclassesofuserswhichduetothecomplexityofantennatrackingalgorithms.supportdifferentdataratesandQualityofServiceThus,atrade-offbetweendatarateandmobilityisrequirements.Duetothecomplex
4、ityofsmartantennarequired.ThreedifferentTrafficChannelClasses(TCC)algorithms,atrade-offbetweendatarateandmobilityiswithdifferentantennaconfigurationsanddifferentQoSrequired.Themodulationandcodingparametersoftheparameters(biterrorrate,frameerrorrate,mobility,etc.)variousclassesarespecifiedandsimula
5、tionresultsarehavebeenestablished.InTCC-A,onlyomnidirectionalshownforaspace-timechannel,consideringapre-Rakeantennasareemployedandadatarateof64kbits/sisandaspace-timeRakereceiver.envisaged.InTCC-Balinearantennaarraywith8elementsisemployedatthebasestationtosupportdata1-Introductionratesofupto2Mbits
6、/s.InTCC-CantennaarraysaretobeFirstandsecondgenerationmobilecommunicationemployedinbothmobile(4elements)andbasestations(8systemshavebeensuccessfullydeployedworldwide,butelements),supportingupto32Mbits/s.Acommonnewdevelopmentsarenecessaryinordertosatisfythesignallingchannel,theNACCH(NetworkAccessan
7、dnewrequirementsofhighercapacity,higherdataratesandConnectivityChannel),isembeddedinalltheTrafficserviceflexibility.OnestepinthisdirectionhasbeenChannelClasses.TheIBMSconceptisdepictedinFig.1.achievedbythe3rdgene
