初级选择86题

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1、1.The_______temporarilystoresinformationabouttheMScurrentlyvisitingitsServiceArea?（1）VLR（2）HLR（3）EIR2.WhichofthefollowingnumbersisthedirectorynumberofasubscriberinaGSM/PCSnetwork?（1）IMSI（2）MSISDN（3）MSRN3.WhatistheinterfacebetweenMSCandBSCknownas?（1）A-interface（2）Abis-interface（3）B-interfaceXxx4.Th

2、einterfacebetweenBSCandtheBTSisknownas?a）A-interfaceb）A-bis-interfacec）B-interfaceXxb5.ThenormalcellmaximumradiusforGSMis?a）35kmb）70kmc）50kmxxx6.Whichunitisusedforthetranscodingofspeechinformation?a）TRAU（TC）b）TRHc）TRX7.Thetwodifferenttypesofmultiframesare?a）13-and26-frameb）26-and51-framec）51-and10

3、2-framexxb8.TheCellIdentityisuniqueto?a）TheLocationAreab）TheMSC/VLRServiceAreac）ThePLMN9.Whattypeofinterferenceisproducedbyothertransmittersonthesamerequency?（1）Doubleinterference（1）Co-channelinterference（2）Adjacentchannelinterference（3）Reflectedinterference（4）TiminginterferenceXxx2.Whatpropertyof

4、acellislimitedbytimingadvance?（1）Numberofsimultaneouscalls（2）Frequencyofcallsetups（3）Radius（4）Antennalength（5）ColorXxb3.Whatistheideaofusingacombiner?（1）UptofoursitescanshareonePCMlink（2）SeveralTRXscanshareoneantennasystem（3）Themobilecanlistentotwobasestationsatthesametime（4）Onlyonebasestationisne

5、ededpersite（5）SendingandtransmittingcanbeperformedfromthesameantennaXxx、xxb4.WhichofthefollowingisthenominaloutputpowerforaGSM900class4orGSM1800/GSM1900class1mobilestation?（1）27dbm（2）29dbm（3）31dbm（4）33dbm（5）35dbm5.Whyarebasestationssometimescascade/chain(级连)connected?（1）Tosaveantennas（2）Tobeableto

6、reusefrequencies（3）ToshareRBSequipment（4）Tosimplifytheinstallation（5）TosharePCMlinksXxx、xxb6.Atransmittedsignalisreceivedat-50dBmandthereis-150dBminterferenceatthesamefrequency.WhatisC/I?（1）12dB（2）30dB（3）50dB（4）80dB（5）100dB7.FrequencyHopping________________.（1）Improvesthespeechqualityofslowmovingv

7、ehicles.（1）ReducestheeffectsofCo-ChannelInterference.（2）ImprovestheefficiencyofthePCMlink.（3）BothAandB.2.Howmanytimeslotspercarrier?（1）8（2）3（3）32（4）163.Whatisthetransmissionrateoverthe“airinterface”inGSM?（1）64kbp