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1、TalkaboutthedevelopmenttrendformobilecommunicationsOne，introduction:Mobilecommunicationmeansbetweenthemobileusers,ormobileusersandfixedcommunicationsbetween.，Withthedevelopmentofelectronictechnology,particularlysemiconductors,setsDevelopmentofcircuitandcomputertechn
2、ologyandmobilecommunicationshaveenjoyedrapiddevelopment.Withtheexpansionofitsapplicationfieldsandonimprovingtheperformancerequirements,allowmobilecommunicationintechnologyanddevelopmentofthetheorytoahigherlevel.Sinceinthe1980softhe20thcentury,themobilecommunications
3、havebecomeindispensableinmoderncommunicationnetworkandoneofthefastestmeansofcommunication.Reviewingthedevelopmentofmobilecommunications,mobilecommunicationsdevelopmentthroughseveralstagesofdevelopment:thefirstmajorcellularmobilecommunicationtechnologyofanalogmobilec
4、ommunications,thetechnicalcharacteristicsofCellularnetworkstructureovercometheregionalcapacitylow,restrictedthescopeofactivitiesoftheproblem.SecondGisthecellularmobilecommunications,cellularsystemscanprovideintegratedservicedigitaltransmission,andotheradvantages.Mai
5、nCharacteristicsofthirdGisinadditiontoprovidingsecondofmobilecommunicationsystemownadvantages,overcomeitsshortcomings,butcanalsoprovidebroadbandmultimediaservicecanprovidehigh-qualityvideomultimediaintegratedservices,andglobalroaming.Withmostofthemarenowsecondtechno
6、logy,thirdtechnologyisstillnotverysuccessful.buttherearealreadyfourthtechnologyvision.4Gstandardwithmorethanthirdofthefourthmobilecommunicationsystemfunction.。Two.4Gaboutmobilecfourththeconceptofmobilecommunicationtechnologiesasbroadbandaccessanddistributionnetwork,
7、withasymmetryover2Mbitsdatatransmissioncapacity.Itconsistsoffixedbroadbandwirelessaccessandbroadbandwirelesslocalareanetwork,mobilebroadbandsystemandinteractivebroadcastingnetwork.fourthGstandardsthanthirdstandardhasmorefunctionality.Indifferentfixedfourthg,wireless
8、platformsandwirelessservicesacrossdifferentfrequencybandnetwork,inanyplacewithbroadbandInternetaccess,includingsatellitecommunicationandst
