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ID:42381360
大小:73.00 KB
页数:12页
时间:2019-09-14
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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
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