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ID:34452023
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页数:12页
时间:2019-03-06
《integrated broadband mobile system (ibms) featuring smart antennas》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、IntegratedBroadbandMobileSystem(IBMS)FeaturingSmartAntennasM.Bronzel,J.Jelitto,M.Stege,N.Lohse,D.Hunold,andG.FettweisDresdenUniversityofTechnology,Germanybronzel@ifn.et.tu-dresden.deAbstract:IBMSisaconceptforfuturemobilecommunicationsystemstoprovidealargerange
2、ofdatarateswithdifferentdegreesofmobility.TheintegrationofheterogeneousservicesandcommunicationsystemsrequiresacommonNetworkAccessandConnectivityCHannel(NACCH)forbasicsignalingtoprovidepermanentnetworkaccess.SmartAntennasareutilizedtoadaptivelyenableatrade-off
3、betweenmobilityanddatarate.I.IntroductionCurrently,wirelesscommunicationsystemsaredesignedforspecificdataratesandmobilitysupport.Whilehighmobilityisprovidedbypersonalcommunicationsystemsatlowdatarateswithlimitedpotentialservices,higherdataratesupto155Mb/swillb
4、esupportedbywirelessATMand/orIPsystemsforuserswithlimitedmobility.However,futuredemandsformobilecommunicationsystemswillbedominatedbytheheterogeneityofbroadbandandnarrowbandservices,whichhavetobesuppliedinin-houseandoutdoorenvironmentssimultaneously,withvaryin
5、gdegreesofmobility.TheobjectiveoftheIntegratedBroadbandMobileSystem(IBMS)[1,2]istoprovideaunifiedwayforsupportingavarietyofcommunicationclassesrangingfromhighmobilitywithlowdataratestowardsportabilityathighdataratesasanintegralfeatureofawirelesscommunicationsy
6、stem.Thisrequiresthedevelopmentofauniformnetworkstructure,whichalsoenablestheintegrationofdifferentcommunicationsystems,workingatdifferentfrequencies.Figure1relatesIBMStootherEuropeanresearchprojects.MobilityMBSmobileGSMUMTSIBMSportableDECTHIPERLAN/WANDMEDIANf
7、ixedISDNB-ISDN2Mbit/s20Mbit/s155Mbit/sDataRateFigure1:IBMSconceptwithrespecttootherEuropeanresearchprojects(V.Brankovic).II.SystemConceptThekeyfeaturesoftheIBMSconceptarediscussedinmoredetailinthefollowingsections.HierarchicalstructureAnintegratedcommunication
8、systemforheterogeneousservicesandterminalswithdifferentairinterfacesandvariablebit-ratesrequiresanewnetworkinfrastructure.ApossibleapproachcouldbeahierarchicalstructureofNetworkSer
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