GSM-选择150

1.手机在空闲状态下进行小区重选的准则是。(B)Thecriteriaforcellreselectioniswhenthemobilephoneisinidlestatus.(B)A.接收电平ReceivelevelB.C2值C2valueC.接收质量ReceptionqualityD.干扰指标Interferenceindex2.适用于密集城区的站型及天线选型是________;(B)Thebasestationandantennasuitablefordenseurbanareaare.(B)A全向基站；Omni-directionalbasestationB3小区基站，水平65度，增益15.5dbi左右；Basestationwith3cells,horizontal65degrees,about15.5dbigainC3小区基站，水平65度，增益18dbi左右；Basestationwith3cells,horizontal65degrees,about18dbigainD3小区基站，水平90度，增益15.5dbi左右；Basestationwith3cells,horizontal90degrees,about15.5dbigain3.在边际网的建设中，经常用到塔放，BOOSTER等设备，考虑到上行不足，需要改善的，是需要使用以下哪种设备：（A）ToweramplifiersandBOOSTERareoftenusedduringconstructionofaboundarynetwork.Whichdeviceshouldbeusedinordertoimprovetheinsufficiencyofuplink?(A)A塔放ToweramplifierBBOOSTER4.具有相同BCCH载波频率的不同基站可以通过来区分(D)DifferentbasestationswiththesameBCCHcarrierfrequencycanbedistinguishedby____.(D)AC1参数C1parameterBC2参数C2parameterC电平值RxlevLevelvalueRxlevD基站识别码BSICBaseStationIdentificationCode(BSIC)5.通话过程中由于信号质量劣化需要进行切换，通常在信道上传递切换指令的。（A）Whenhandoverisnecessaryasthesignalqualitydeterioratesduringconversation,usuallythehandovercommandistransmittedalongthe.(A)A.FACCHB.TCHC.SACCHD.BCCH6.当小区禁止限制CBQ打开（设置为“1”），小区接入禁止CBA也打开（即设置为1）时，小区选择优先级为。（C）WhenboththeCellBarQuality(CBQ)andtheCellBarAccess(CBA)ofthecellareenabled(bothsetto1),thepriorityofcellselectionis.(C)A.正常NormalB.高HighC.低Low7.基站控制器BSC与移动交换中心MSC之间的接口称为接口。（B）TheinterfacebetweentheBaseStationController(BSC)andtheMobileSwitchingCenter(MSC)iscalledinterface.(B)A.UmB.AC.BISD.G8.基站的发射功率为80W，如果算成dbm是多少：。（D）Thetransmitterpowerofbasestationis80W,whichisequaltodbm.(D)A.10B.46C.41D.499.移动台收发信号要求有时隙的间隔，这个演示对于整个GSM网络是个常数。（A）Thereshouldbeanintervaloftimeslotsforthemobilestationtoreceiveandsendsignals.ThisisaconstantastotheentireGSMnetwork.(A)A.3B.2C.4D.810.BSPAMFRMS的选择应以保证寻呼信道不发生过载为原则，在此前提下应使该参数尽可能。（C）ThevalueofBSPAMFRMSshouldnotcausethepagingchannelbeingoverloaded.Underthisprecondition,thisparametershould.(C)A.不变RemainunchangedB.大BelargestpossibleC.小Besmallestpossible11.移动台在收到立即支配拒绝消息后必须经过指示的时间后才能发生新的呼叫。（D）AfterreceivingtheImmediateAssignmentRejectedmessage,themobilestationcannotplaceanewcallbeforethetimeindicatedbyexpires.(D)A.T3101B.T3126C.T3212D.T312212.就是将所有载频分为几组，每一组载频作为独立的一层，不同层的频率采用不同的复用方式。（d）meansdividingallthecarrierfrequenciesintoseveralgroups,eachgroupofcarrierfrequenciesconstituteanindependentlayer,anddifferentreusemodesareusedforthefrequenciesindifferentlayers.(d)A普通复用OrdinaryreuseB.双重复用DoublereuseC.同心圆复用ConcentricreuseD.多重复用MRPMultipleReusePatter(MRP)13.适用于郊区的基站和天线是：。（C）Thebasestationandantennasuitableforthesuburbare.(C)A.全向基站Omni-directionalbasestationB.3小区基站，水平65度，增益15.5DBI左右；Basestationwith3cells,horizontal65degrees,about15.5DBIgainC.3小区基站，水平90~120度，增益15~18DBI天线；Basestationwith3cells,horizontal90~120degrees,about15~18dbigainD.2小区基站，水平180，增益20DBI左右。Basestationwith2cells,horizontal180degrees,about20DBIgain14.勘测中通常用到的工具中，下列不需要的是：。（C）Whichofthefollowingtoolsisnotrequriedduringsurvey?(C)A.GPSB.数码相机DigitalcameraC.频谱分析仪SpectrumanalyzerD.皮尺Tapemeasure15.GSM900常用的传播模型为：。（A）ThepropagationmodelcommonlyusedinGSM900is.(A)AOkumura-HataB.COST-231C.COST-231-Walfish-Ikegami16.移动台处于专用模式时，系统消息在信道上传送。(D)ThesystemmessageistransmittedonwhentheMSisinthededicatedmode.(D)A.BCCHB.FACCHC.DCCHD.SACCH17.GPS至少需要颗卫星进行3维定位？（C）GPSneedsatleast________satellite(s)for3Dpositioning.(C)A.1B.2C.3D.418.小区天线极化方式分为(ABC)Thepolarizationmodesofcellantennainclude:(ABC).a)A水平极化Horizontalpolarizationb)B.垂直极化Verticalpolarizationc)C.交叉极化Crosspolarizationd)D.直线极化Linearpolarization19.天线的下倾方式一般来说可分为（AB）Thetiltmodesofantennatypicallyinclude(AB).A.机械下倾MechanicaltiltB.电子下倾ElectronictiltC.固定下倾FixedtiltD.可调下倾Adjustabletilt20.切换按照涉及的前后两个小区的归属可以分为（ABCD）Accordingtothelocationsofthecellsinvolved,thehandovercanbeclassifiedinto(ABCD).A.小区内切换Intra-cellhandoverB.BSC内小区间切换Inter-cellhandoverwithinBSCC.MSC内BSC间切换Inter-BSChandoverwithinMSCb)DMSC间的切换Inter-MSChandover21.自由空间的传播损耗，1800MHZ比900MHZ的网络多（D）Thefreespacepropagationlossofthe1800MHZnetworkis(D)morethanthatofthe900MHZnetwork.A.3dbB.4dbC.5dbD.6db22.1800MHZ比900MHZ网络的建筑物贯穿损耗一般为（B）Thebuildingbreakthroughlossesofthe1800MHZnetworkandthe900MHZnetworkarerespectively(B).A.13.2db,14.3dbB.13.4db,14.2dbC.14.3db,13.2dbD.14.2db,13.3db23.基站识别码（BSIC）由（CD）组成。TheBaseStationIdentificationCodeconsistsof(CD).A.MCCB.MNCC.NCCD.BCC24.小区全球识别（CGI）由（ABCD）组成。TheCellGlobalIdentification(CGI)consistsof(ABCD).A.MCCB.MNCC.LACD.CI25.公共控制信道（CCCH_CONF）配置为（A）时，表示CCCH使用一个基本物理信道，不与SDCCH共用。WhentheCommonControlChannel(CCCH_CONF)isconfiguredas(A),itindicatesthatabasicphysicalchannelisusedasCCCH,notcombinedwithSDCCH.a)A000b)B.001c)C.010d)D.01126.C1是移动台进行小区选择的依据，计算公式和含义为（D）C1isabasisfortheMStoselectacell.Thecalculationformulaandmeaningare(D).A.C1＝RXLEV_MIN－RXLEV，RXLEV是小区的接收电平，RXLEV_MIN是手机允许接入的最小接收电平C1=RXLEV_MIN-RXLEV,whereRXLEVisthereceivelevelofcell,andRXLEV_MINistheminimumreceivelevelthatMSisallowedtoaccess.B.C1＝RXLEV_MIN－RXLEV，RXLEV是手机的接收电平，RXLEV_MIN是小区允许接入的最小接收电平C1=RXLEV_MIN-RXLEV,whereRXLEVisthereceivelevelofMS,andRXLEV_MINistheminimumreceivelevelthatthec