GSM无线网络基础知识考试题含答案

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G网无线试题和答案

G网无线试题和答案

G网无线试题和答案G网无线试题和答案GSM 测试题1.哪个网络部件能够提供交换并连接到像PSTN的其他网络上?DA.运行维修中心B.网络管理中心C.基站系统D.移动交换中心2.GSM采用5个标准来实现切换,其中三个是RF、MS位距和功率预算,另外两个是什么?ABA.移动电话的质量和功率等级B.质量和干扰C.干扰和短信息服务D.移动电话的功率等级和短消息服务3.GSM的哪个功能使同一带宽的信道数量翻倍?BA.断续传输B.半速率话音C.较高的数据速率D.调节两个电话的相位(使两个电话一致)4.BSS有3个主要部件,它们分别是什么?BA.M S、MSC和OMCB.BSC、BTS和XCDRC.B SC、XCDR和MSCD.M SC、HLR和VLR5.BSC把电路连接到空中接口的上。

CA.B SC把DATA(数据)电路连接到空中接口的CONTROL BITS(控制比特)上B.BSC把TERRESTRIAL(陆地)电路连接到空中接口的FRAMES(帧)上C.B SC把TERRESTRIAL(陆地)电路连接到空中接口的CHANNELS(信道)上D.B SC把RADIO(无线)电路连接到空中接口的CHANNELS(信道)上6.XCDR把kbps的音频电路转化为GSM规定的kbps信道。

AA.X CDR把64kbps的音频电路转化为GSM规定的16kbps信道B.XCDR把120kbps的音频电路转化为GSM规定的16kbps信道C.X CDR把9600kbps的音频电路转化为GSM规定的2400kbps信道D.X CDR把64kbps的音频电路转化为GSM规定的120kbps信道7.哪些网络单元使用OML信令链路?CA.M SC和MSB.BSC和BTSC.O MC和BSCD.B TS和MSC8.消息传送链路(MTL)载送往来于MSC和BSC间的信令消息,MTL使用的是哪种信令协议?CA.X.25/doc/5b14741280.html,PBC.C7D.L APD9.什么类型的突发序列是用来载送业务和控制信息,而且是双向的?BA.频率校正突发序列B.标准突发序列C.伪突发序列D.接入突发序列10.哪种编码可提供错误保护并以1:2的比率提高比特数量?CA.话音和数据编码B.加密编码C.卷积编码D.奇偶校验位编码11.交织为了进行错误保护,把已编码的话音或数据块的内容分散在许多空中接口突发序列上,请问话音块采用的是哪种交织方式?AA.对角线交织B.矩形交织C.对角线交织和矩形交织D.循环交织12.移动台可执行的最大时间提前量是多少?BA.4.615msB.233usC.3时隙D.577us13.下列中的哪一项不是用于克服多径衰减的?DA.跳频B.均衡C.分集D.小区定向14.空中接口时隙的时长是577us,那么一个突发序列的时长是多少?CA.20msB.577usC.546usD.4.615ms15.下列哪个信道载送呼叫期间来自移动台的测量信息?AA.S ACCHB.SDCCHC.B CCHD.T CH16.移动台在首次接入蜂窝系统时使用的是哪个逻辑信道?BA.F ACCHB.RACHC.S ACCHD.A GCH17.TDMA帧中哪些时隙可以用于载送DCCH 信道?AA.任意一个B.0时隙C.1-7时隙D.0,2,4,6时隙18.哪个逻辑信道把SDCCH指配给移动台?DA.F ACCHB.RACHC.S ACCHD.A GCH19.微蜂窝天线安装的最佳位置在哪?AA.户外,低于屋顶B.户外,置于屋顶C.建筑物内部D.尽可能的靠近BTS20.位于建筑物内的蜂窝叫什么名字?BA.E rlang爱尔兰B.Picocell微微蜂窝C.N anocell纳小区D.M acrocell宏蜂窝21.进行KSW扩展时,用半尺寸板发送扩展信息,用半尺寸板接收扩展信息BA.R mt KSWX, Rmt KSWXB.Rmt KSWX, Lcl KSWXC.E xp KSWX, Lcl KSWXD.E xp KSWX, Exp KSWX22.在一个BSC中,哪一个是OML的缺省位置?BA.M SI slot 16, port 0, Timeslot 1MSI slot 16, port 1, Timeslot 1MSI slot 14, port 0, Timeslot 1MSI slot 14, port 1, Timeslot 1B.MSI slot 16, port 0, Timeslot 1, Cage 0 MSI slot 16, port 1, Timeslot 1, Cage 0 MSI slot 14, port 0, Timeslot 1, Cage 0 MSI slot 16, port 0, Timeslot 1, Cage 1C.M SI slot 16, port 0, Timeslot 1, Cage 0 MSI slot 16, port 1, Timeslot 1, Cage 0 MSI slot 16, port 0, Timeslot 1, Cage 1 MSI slot 16, port 0, Timeslot 1, Cage 1D.M SI slot 12, port 0, Timeslot 1MSI slot 12, port 1, Timeslot 1MSI slot 14, port 0, Timeslot 1MSI slot 14, port 1, Timeslot 123.一个载频应该占用一条E1线(BSC-BTS)的几个时隙?BB.2C.4D.1624.GPROC板与全尺寸板之间的通信是由下列哪条总线来完成的?CA.S erial BusB.TDM HighwayC.M CAPD.L AN25.一个BSC以星型连接带两个BTS(BTS1 和BTS2),BSC从哪里提取时钟信号?DA.R XCDRB.BTS1C.B SC与BTS相连的具有较高优先级的E1 线D.B SC与RXCDR相连的具有较高优先级的E1线26.一条MCAP总线需要多少块GPROC板来管理?DA.0B.3D.127.FMIC属于下列哪一类告警?CA.仅仅是一条信息,不被认为是一条告警B.产生告警信息的故障被排除后,告警信息仍然存在C.产生告警信息的故障被排除后,告警信息自动清除D.严重告警28.决定是否有进行切换的必要的软件进程是:AA.H DPCB.CRMC.S SMD.C LM29.决定切换的标准的优先级顺序是BA.R eceive Quality, Receive Signal Strength,Distance, Power Budget, InterferenceB.Receive Quality, Interference, ReceiveSignal Strength, Distance, Power Budget C.R eceive Signal Strength, Receive Quality,Interference, Distance, Power BudgetD.R eceive Signal Strength, Receive Quality,Distance, Power Budget, Interference30.下面哪个陈述是正确的?AA.跳频时,接收器频率总是在不断跳变B.跳频只发生在MS这一端C.基带跳频不能包括BCCH载频D.以上说法都不对31.在繁忙的市中心,一商场角落, 需要900MHz的额外覆盖。

GSM试题库(有答案)

GSM试题库(有答案)

一、选择题(一) 单项选择题1.如果空闲状态下手机用户改变所属小区会通知网络吗?A、会B、不会C、会,如果同时改变了位置区的话D、会,如果同时改变了所属BSC2.当手机向网络发送第一条信息时,其使用的空间逻辑信道是那一个?A、PCH信道B、RACH信道C、AGCH信道D、BCCH信道3.在空中接口中,使用的是以下哪一个逻辑信道发送系统信息给处于ACTIVE状态的手机?A、FACCH信道B、SDCCH信道C、SACCH信道D、SACCH与FACCH信道都用4.在信道建立过程中,手机从立即指派命令中得到的是什么信息?A、有关其将要使用的RACH信道的信息B、有关其将要使用的SDCCH信道的信息C、有关其将要使用的TCH信道的信息D、所有以上三种信道的信息都有5.如果使用LAPD Concentration技术传输某三个载波小区的语音与信令且Confact为4,则需要使用Abits接口上PCM链路的多少个时隙?A、4个B、6个C、7个D、9个6.GSM系统所使用的多址方式为A、码分多址B、时分多址C、频分多址D、B与C都用7.以下哪种频率复用方式的抗干扰能力最好?A、7/21B、4/12C、3/9D、MRP8.以下哪种情况容易出现C/R值偏低?A、将基站建在离建筑物近的地方B、将基站建在离建筑物远的地方,天线背向建筑物且具有较高的前背比C、将基站建在湖泊区附近的地方D、将基站建在平原地区9.基站与BSC之间的接口叫(1),它最多可以携带(2)个时隙用于传输基站信令与语音?(1)A、A接口B、Abits接口 C、Ater接口 D、以上都不对(2)A、32 B、31 C、16 D、810.MS与基站之间信息传递所使用的协议是A、LAPD协议B、LAPDm协议C、CCITT NO.7协议D、TCP/IP协议11.以下哪种情况可以通过跳频有效地改善?A、时间色散B、多径衰落C、互调干扰D、码间干扰12.在人口密集的市区,最适合使用以下哪种网络结构?A、伞形小区、普通小区B、伞形小区、普通小区、微蜂窝C、伞形小区、微蜂窝D、普通小区、微蜂窝13.以下哪种功能不是由BTS单独进行的?A、跳频B、功率控制C、不连续发射D、以上都不是14.某载波的频率号是95,其对应的频点是:A、954兆B、953兆C、952兆D、951兆15.与无线相关的功能是由GSM中的哪一个子系统进行管理的?A、ASSB、BSSC、OSSD、VOS16.我们使用最多的从BTS到BSC的传输接口是A、T1 1.5 Mbit/s, 100欧姆,内部同步B、T1 1.5 Mbit/s, 100欧姆,PCM同步C、E1 2 Mbit/s, 75欧姆,PCM同步D、E1 2 Mbit/s, 120欧姆,PCM同步17.以下总线不是RBS2202里所使用的。

无线试题-GSM1

无线试题-GSM1

一、填空1)目前,GSM频段是从__________到__________(手机发射),到(手机接收),相对应的频点号从_________到_________。

2)DCS1800频段是从__________到__________(手机发射),__________到__________(手机接收),相对应的频点号从_________到_________。

3)0dB的含义是__________?1W=__________dBm。

4)GSM系统使用的多址方式为__________。

答案:1.890MHZ、915MHZ、935MHZ、960MHZ、1、124。

2.1710MHZ、1785MHZ、1805MHZ、1880MHZ、512、885。

3.无增益、30。

4.FDMA+TDMA。

二、选择1)处于空闲模式下的手机所需的大量网络信息来自__________信道。

A、BCCHB、CBCHC、RACHD、SDCCH答案:(A)2)关于Um接口说法错误的是__________A、又称空中接口,用于手机与GSM系统固定部分之间的互通B、是手机与BTS间的通信接口C、其物理连接通过PCM链路实现D、传递的信息包括无线资源管理、移动性管理和接续管理答案:(C)3)未使用扩展范围(Extended Range)的GSM小区的最大半径为。

A、35kmB、50kmC、70kmD、129km答案:(A)4)关于位置区的说法错误的是__________A、一个位置区可以属于多个BSCB、一个位置区可以属于几个MSCC、一个位置区只能由一个MSC处理D、一个位置区有一个特定的识别码答案:(B)5)使用combiner的原因是__________A、最多可以有4个Site使用同一PCM链路B、多个TRXs可以使用同一天线系统C、手机可以同进收听2个基站的信息D、发射和传送均由同一天线完成答案:(B)6)手机使用DTX的好处是__________。

GSM无线部分试题和答案

GSM无线部分试题和答案

GSM/GPRS test Radio Part单选题:1.What is GSM 900 and E-GSM 900 frequency band?A. UL:890-915,DL:935-960, UL:880-890, DL:925-935B. UL:890-915, DL:935-960; UL:880-915, DL:925-960C. UL:890-915, DL:935-960, UL:885-890, DL:930-935B2. The design level, SSdesign, isA) the signal strength value that should be used in the power budgetB) the signal strength value that should be obtained at the cell borderwhen planning with prediction tools like TEMS CellPlannerC) the signal strength value obtained as EiRP - LpD) the signal strength value an MS of class 4 must be able to obtainE) the required signal strength plus a Rayleigh fading marginB3. What is the most common value of the hysteresis used when estimating margins for log-normal fading?A) 3 dBB) 5 dBC) 6 dBD) 8 dBE) 10 dBA4. A repeater can be used toA) increase the capacity locally (in a traffic hot spot)B) increase the capacity along highwaysC) get better coverage on waterD) get better coverage where the area to be covered is blocked byobstaclesE) for neither of these purposesD5. What expression is usually used for the paging success rate?A) Successful repeated page attempts (in location area) of total numberof first and repeated page attempts (in location area).B) Successful repeated page attempts (in location area) of total numberof repeated page attempts (in location area).C) Rate of discarded paging messages in the BSC.D) Successful first and repeated page attempts (in location area) of total number of first page attempts (in location area).E) Successful first and repeated page attempts (in location area) of total number of first and second page attempts (in location area).D6. How many transmitters (TXs) can be configured to an omni antennausing a CDU-C?A) 1B) 2C) 4D) 6E) 8C7. The three radio network recording facilities in the BSC whichcan be accessed from OSS to monitor the behavior of the mobile fromthe network side is:A) STS, CER and RNRB) CER, MTR and RNRC) MTR, RNR and CTRD) CTR, RNR and STSE) CTR, MTR and CERE8. Why are neighbouring cell relations created before using the frequency TCP?A) To set hysteresis parametersB) For export to CNAC) To estimate adjacent-channel interferenceD) For application of carrier separation constraintsE) To estimate co-channel interferenceD9. Which unit is used for the transcoding of speech information?A) TRAUB) TRHC) TRXA10. What is true about microcells and picocells?A) A picocell is an indoor cell and a microcell is an antenna placedbelow the roof topB) A picocell is an umbrella cell and a microcell is a normal cellC) They are both the same thingD) A picocell is used in Europe and a microcell are used in the USAE) A picocell is an indoor cell and a microcell is a macro cellA11. What does the modified Keenan-Motley model for indoor wavepropagation path loss not take into account directly?A) Transmitter to receiver separation distanceB) Floor attenuation (and the number of floors traversed by the directwave)C) Wall attenuation (and the number of walls traversed by the directwave)D) Distant dependent linear attenuationE) Reflection and diffractionE10. Why is the GSM normal cell radius limited to 35 km with one time slot per traffic channel?A) Problems with time alignmentB) The frequency re-use pattern sets the limitC) The output power may not exceed 40 WA11. What type of system information message is mandatory to broadcast, when frequency hopping on SDCCH is used?A) System information type 1B) System information type 4C) System information type 7A12. When is the priority class considered for GPRS cell re-selection?A) Only, if there is no PBCCH in the cell.B) Only, if there is a PBCCH in the cell and there are cells with C31>= 0.C) Only, if there is a PBCCH in the cell and there are no cells with C31>= 0.D) Only, if there is a PBCCH in the cell and (C1<0 for the serving cell or there is a“better” cell).E) Only, if there is a PBCCH in the cell and C1>0 for the serving cell.B13. Are UL signal strength measurements used in the locating algorithm?A) Yes, of course.B) No, not at all.C) Yes, but it is used only to check if conditions for intra-cell andurgency handovers are fulfilled.D) No, it is used only for power control of the mobile.E) Yes, but it is used only to check if conditions for intra-cell handoverare fulfilled.E14. What is the parameter TINIT used for?A) To set the initial value of the timer that inhibits handover after a change of channel.B) To set the initial value of the timer that controls the measurement events of the mobile.C) To set the initial value of the timer that controls if handover during signaling is allowed or not.D) To set the initial value of the timer that controls if handover to another BSC is allowed or not.E) To set the initial value of the timer that controls the filtering process.A15. The purpose of ramping is to avoid handover decisions to a new neighborbased only on a few samples. What is a common parameter setting formacro cells?A) SSRAMPSI=10 and SSRAMPSD=20B) SSRAMPSI=20 and SSRAMPSD=10C) SSRAMPSI=10 and SSRAMPSD=10D) SSRAMPSI=5 and SSRAMPSD=2E) SSRAMPSI=2 and SSRAMPSD=5E16. What is true about inter-BSC handover?A) It is possible to transfer a penalty list.B) It is possible to indicate the cause of the handover.C) It is possible to use the penalties set for the old cell.D) TALLOC does not apply at inter-BSC handover.E) TURGEN does not apply at inter-BSC handover.B17. What is the purpose of setting BSRXSUFF to –150 dBm and MSRXSUFFto 0 dBm?A) To make sure that the uplink signal strength influences the basicranking.B) To enable path loss ranking.C) To ensure that the signal strength on the uplink is always sufficient.D) To obtain an absolute signal strength ranking.E) To disable path loss ranking.D18. The figure below shows the outcome from basic ranking. Assuming all cells except D and H fulfil band and layer thresholds, what cells should be prioritized and in what order?A) A, B, E, and GB) G, E, B, A, C, and FC) G, E, B, and AD) B, A, F, G, E, and CE) A, B, F, G, E, and CBasic Ranking OnlyCell SS Band LayerG -68 8 7E -72 8 6B -73 4 4A -74 4 3C -75 8 7F -78 4 4D -95 4 4H -96 8 7A19. The idle mobile derives an entity called C2. How is C2 used?A) C2 for a particular cell must be larger than zero for a mobile to be allowed to camp on that cell.B) C2 is a quality check, and if not fulfilled, the idle mobile must try another cell to camp on.C) C2 and BSIC are reported to the serving cell, at least ,once everyfive seconds to enable network controlled cell re-selection.D) At cell re-selection, the cell with the largest derived C2 is chosen to camp on.E) C2 is set to yes if both CB and CBQ are low.D20. Which of the following paging strategies is the most common?A) First page global, no second pageB) First page global, second page globalC) First page in location area, no second pageD) First page in location area, second page in location areaE) First page in location area, second page globalE21.. What is the paging capacity, if BCCHTYPE=NCOMB, AGBLK=1 andCBCH=YES assuming only IMSI pages are possible? 7*2/0.235A) 8 pages/secondB) 16 pages/secondC) 32 pages/secondD) 64 pages/secondE) 128 pages/secondD22. Which parameter(s) determine(s) whether assignment to another BSC ispossible or not?A) ASSOCB) IBHOASSC) HNDSDCCHTCHD) ASSOC, IBHOASS and HNDSDCCHTCH togetherE) ASSOC and IBHOASS togetherD23.Which of these conditions for cell load sharing is not true?A) CLS HO is not allowed during assignment.B) CLS HO is not allowed, if there is an urgency condition.C) When evaluating the amount of idle channels, CLS regards dedicated and on-demand PDCHs as idle full rate traffic channels.D) The neighboring cell must belong to the same HCS layer.E) The neighboring cell must have HOCLSACC=ON.C24. Which are the GPRS mobility management states?A) Idle and dedicated statesB) Idle, standby, and ready statesC) Idle, standby, and dedicated statesD) Idle, dedicated, and ready statesE) Idle and standby statesB25.. If a call is dropped during excessive TA, bad quality and poor signalstrength, which cause counter will step?A) SS drop counterB) Q drop counterC) TA drop counterD) All of theseE) None of theseC26. Which is the most important factor for determining the paging capacity inthe BTS?A) MFRMS (controls the number of paging groups)B) AGBLK (reserves a paging block for access grant)C) Paging strategy (for example, second page in the MSC service areaor in the LA)D) Combined or non-combined mappingE) The use of cell broadcastD27. What parameter is used for the output power at the locating reference point on non- BCCH carriers?A) BSPWRB) BSPWRBC) BSRXSUFFD) BSTXPWRE) BSPWRTD28.Which function is used to get the accurate data from the real Network into CNA Valid Area?1) Adjustment2) Update3) Consistency Check4) ModifyA29.What is added to the required MS sensitivity to obtain the required signal strength, SSreq?A) Rayleigh fading marginB) Rayleigh fading margin and interference marginC) Rayleigh fading margin, interference margin and body lossD) Rayleigh fading margin and body lossE) Interference margin and body lossC30. Which set of features below could be used to reduce interference in the network?A.BTS Power control and DTXB.DTX and assignment to worse cellC.Both a and bA多选题:1. Which of the following is not a valid SDCCH configuration?A. SDCCH/4 combined with CCCH on timeslot oneB. SDCCH/4 including CBCH combined with CCCH on timeslot zeroC. SDCCH/8 non-combined with CCCH on timeslot zeroD. SDCCH/8 including CBCH non-combined on timeslot oneE. SDCCH/8 non-combined on timeslot oneA,C2. Which factor will have impact on the paging capacity in the BTS?A. MFRMS (controls the number of paging groups)B. AGBLK (reserves a paging block for access grant)C. Paging strategy (for example, second page in the MSC service area or in the LA)D. Combined or non-combined mappingE. The use of cell broadcast or notB,C,D,E3. What is the correct protective equipment when handling replaceable units in the RBS?A. Use of an approved ESD wrist strapB. Use of a ground conductorC. Use of insulated toolsD. Use of a multimeterA4. Which of the following is not a BSC KPI?A. Channel Assignment Success RateB. Inter MSC Outgoing Handovers Success RateC. Location Update Success RateD. SDCCH Drop RateE. Traffic per TCHB,C5. How often are measurement reports delivered to the BSC?A. About Once every secondB. About Two times per secondC. About Four times per secondD. Every second 26th multiframeE. It depends on the parameter TINIT6. What does the parameter GAMMA_CH control?A. The nominal output power of the GPRS mobile when ALPHA=0.B. The “forgetting factor”.C. The desired received signal strength at the BTS.D. The maximum output power of a GPRS mobile when accessing a system on a packet control channel.E. The dynamic range of the power control algorithm.A,C7. Which sentence is not correct?A. The Valid Area in CNA is the model of the real Network.B. A Planned Area is an area in which the user can make changes, create, and delete objects etc. without interfering with the real Network.C. A Fallback Area is a copy of the changed part in Valid Area at the moment the Fallback Area was created.D. When the Network is updated with a Planned Area, the Valid Area is not automatically updated as well.C,D8. Which of the following is a reason for Low TCH Assignment Success Rate?A. CongestionB. High TAC. InterferenceD. HW ProblemsA.C.D9. Which application is not available in RNO?A. NCSB. FOXC. PMRD. MRRE. SMOC,E10. We have SDCCH congestion,Which of the following are true?A.No call set-up is possible on SDCCH.B.Features such as assignment to worse cell can be used to improve the situation.C.Call set-up can be made on a traffic channel instead.D.Too many SMS and location update may be the congestion reason.A,C,D11. What is meant by a “fractionally loaded planned” network?A. A network where DTX is used on both uplink and downlink.B. A network where the data transmission is very bursty.C. A network where the number of TRXs per cell is smaller than the number of hopping frequencies.D. A network where the channel utilization never goes above Aserved/#TCHs.E. A network where the “hardware load” is higher than the “frequency load”.C12. Which of the following statements is incorrect in Ericsson’s R10 system?A. One TG consists of up to 24 TRXsB. One TG can be connected to a maximum of 32 cellsC. A cell can be connected to one TG onlyA,Byer 3 provides the Mobile Network Signaling (MNS) service to the user application. To realize these functions in layer 3, separate protocol controlentities exist in the sub-layers, Which separate protocol control entities are in ?A.Connection Management (CM)B. Session Management(SM)C. General Management(GM)D. Mobility Management (MM)E. Radio Resource management (RR)A,D,E14.dTRU – double TRUWhat are double TRU(DTRU) characteristics in the following ?A.Two transceivers in one unit of the same size as the current single TRUB.Two versions, one for GMSK only and one for 8-PSK (EDGE) and GMSKC.Supporting E-GSM 900, GSM 1800 or GSM 1900D.Built in by-passable hybrid for TX combining together with CDU-GE.Supports WCDMAA,B,C,D15.What are RBS 2206 Main Characteristics?A.Antenna jumpers connected directly to the CDUs, which gives reduced RF power lossB. not support WCDMA Plug-in transceiver unit (wTRU)C. Can be co-sited with RBS 200 and RBS 2000 by use of Transceiver ,Group Synchronization (supporting up to 32 TRXs per cell)D.Same footprint as RBS 200, RBS 2202 and RBS 3202 (WCDMA)E.12 TRX capacity16. For what is the parameter TBFDLLIMIT used?A) To specify the maximum number of TBFs per PDCH DL.B) To specify the maximum number of TBFs per PSET DL.C) To specify the preferred number of TBFs per PDCH DL.D) To specify the preferred number of TBFs per PSET DL.E) To specify the maximum number of PDCHs per PSET DL.C17. Which of the following are Call Attempts Counter?A) TASSALLB) TATTALLC) TFCASSALLD) TASSATTA,C,D18. Which are new feature to increases end user application throughput in GPRS/EGPRS R10 network?A.New efficient TBF handlingB.Dynamic handling of resources in DL and ULC. Support more PSETs in one cellD. Increased PDCH channels in one PSETE. More flexible and adaptable GPRS cell planA,B,E(D)19. TEMS speech quality index, SQI, is capable of producing speech quality estimates. What is not taken into account?A) Bit error ratioB) Frame erasure ratioC) Time advanceD) C/I distributionE) DTXC,D20. What factors are wave propagation prediction algorithm 9999 takes into accountA) land usageB) diffraction loss due to obstructing objectsC) curvature of the earthD) vertical antenna gainE) transmitter and receiver antenna effective heights填空题:1. The required isolation between two TX antennas at the same site is____________ dB?302. The average TCH re-use in a 12/8/7/4 MRP is __________?6.33. The channel separation in GSM 900 is__________?200kHZ4. The Assignment Command got by MS will contain the information about__________? TCH5. One paging block can take at most ________ paging requests?4 TMSI6.Assume that there are 12 frequencies (f1-f1B. in the hopping frequency set..default MAIO values allocated to the first seven TRXs in the cell are______________ Answer:0, 2, 4, 6, 8, 10, and 1.7.The number of on-demand and/or dedicated PDCHs can be included in one PSET is__________(R10)Answer:88.As to described in the following,the GPRS network operation mode is_______“Th e network sends a CS paging message for a GPRS-attached MS, eitheron the same channel as the GPRS paging channel, that is, on the PPCH, ifthe MPDCH exists, otherwise on the PCH of the CCCH channel, or on thePACCH, if the MS is in packet transfer mode. This means that the MS needsonly to monitor one channel.”Answer:GPRS network operation mode 19.If MBCR=2 what is a multi-band MS reporting, if the nine strongest measurements are (in SS order) A (900), B (900), C (900), D (1800), E(900), F (1800), G (900), H (1800), I (900), and J (1800).In a 900 cell, the MS reports _____ ,in an 1800 cell, the MS reports____________Answer:A-FA,B, D, F, H, and J.10. AGBLK must be set to________ in Ericsson’s GSM system, if cell broadcast is used in a cell with a non-combined configuration.Answer:1判断题:1.Every 26th multiframe measurement reports delivered to the BSC.F 1042.Cells in the basic ranking list are divided into categories. 8 categories are there, if the serving cell is considered as a category of its own.F 33.The idle mobile derives an entity called C1, C1 for a particular cell must be larger than zero for a mobile to be allowed to camp on that cell. one of the differences between the phase 1 and phase 2T4.establishment causes is Phase 2 establishment causes distinguish between MS originated calls and SMS.T5. The TX reference point, when we do the link budget, is where the jumper cable is connected to the antenna.F6. Null fill-in is obtained by adjusting the phase of the power fed to the different antenna elements slightlyF7. In a 1:3 split the antenna directions on all sites that existed before must be changed 30 degreees.T8. The IMEI check is always done at call setupF9.According to GSM specification, required co-channel C/I>=9dB,adjacent C/I>=0dB. F10. The parameters PSSTEMP and PTIMTEMP are used to penalize another cell in a lower layer.T简答题:1. Logical channels, Please list all channels of following Logical channels contained. BCH:CCCH:DCCH:Answer:BCH:FCCH,SCH,BCCHCCCH:PCH,AGCH,RACHDCCH:SDCCH,SACCH,FACCH,CBCH2. How often the BSIC and the BCCH data must be decoded for the serving cell and for neighboringcells, both in idle and in active mode.3. GPRS question:A. The first message CHANNEL REQUEST of packet is sent on which logicalchannel?B.In which message old RAI (MCC+MNC+LAC+RAC) is sent?C.If there is no MPDCH allocated in the cell, but GPRS is supported, whichSystem Information is informing about GPRS?Answer:A.RACHB. Routing area update requestC.System information 134.Please give the method which can used to defend Multi-path Rayleigh Fading.Answer:Channel Coding, Interleaving, Hop, Receive Diversity5. Give out the command-file deblock MOs of BTSA new site should be connected to the BSC which is part of a GSM-network. The site is of the type RBS 2000; After finished all defined data,the BTS should be operated,but some MOs are still in blocking status, which commands may use let it working?Answer :the command should contained:RXBLE:MO=xx,subord;RXESI:MO=XX,subord;RXESE:MO=XX,subord;RXBLI:MO=xx,subord;分析题:1. There is a roaming customer from Hong Kong, every time he comes to mainland, his mobile will camp on Unicom’s network first. But he can switch the network to CMCC manual ly after the mobile’s automatic PLMN selection. Please analyse the possible reason, and give out at least 2 solutions. (Please also give out the background support theory for your reasons)可能原因1,机场移动信号覆盖较差低于-85dBm,但联通信号高于-85dBm;或者移动和联通电平都低于-85dBm,但是移动信号比联通还弱;可能原因2,机场移动和联通的信号都很强,但是由于用户原来在香港关机时使用的BCCH落在联通频点内方案1,把机场降落跑道的覆盖增强,把BCCH移动可用的最高端频点方案2,让用户把移动加入其优先选网列表中2.In your opinion, what is a possible explanation for the drop rate beingsometimes higher at night? How to improve it?Reason:1.lower DL/UL wireless signal strength2.worse speech quality because low C/I in low signal strength.3.more emergency handover in indoor area result in more handover lost4.bad frequency planning and neighbor relation planning,such as less neighborrelation andSolution:1.improve signal strength by add indoor site ,or repeater ,or add new macro site andso on.2.Improve C/I by change power and power control parameter.3.careful check neighbor relation by collecting night hour data ,add necessaryneighbor relation4.fine tuning frequency ,reduce frequency interference5.reduce not needed handover .6.Increase ACCMIN3. When BTS occur “Rx diversity lost” alarm, what are the main reason and how to improve it?Reason:1.Antenna feeder wrong connected.2.RBS line wrong connected.3.DU/TRU hardware problem.4.驻波比问题Solution:1.Drive test to confirm which cells have wrong coverage problem to located theproblem cell. If it have wrong coverage,Check the antenna directionCheck all the jumpers and feeders from BTS to antenna andCheck all the lines and connectors in BTS2.If no wrong coverage problem, pls check TRU problem or antenna RX problem.4. Please complete the following signaling procedureA. Subsequent HO from MSC B to MSC B’, MSC A is anchor MSCB. MT Basic Call procedure:。

GSM最新试题(含答案)(2021年整理精品文档)

GSM最新试题(含答案)(2021年整理精品文档)

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GMS网规网优(1)一、单项选择题(每题1分,共20分)1。

下列不需要占用SDCCH的活动为: Da.SMS b。

被叫 c.加密 d。

切换2。

“CHANNEL REQUEST”这个消息是在 _____ 信道上发送的。

A a。

RACH b.AGCH c.PCH d.SDCCH3. 小区选择C1算法跟以下那个因素有关? Ca。

Rxlev_min b。

MS_Txpwr_Maxc. Rxlev_Access_Min d。

BS_Txpwr_Max4. 为避免因过多跨越LAC的小区重选而造成的SDCCH的阻塞,我们将与该小区有切换关系且与之LAC不同的相邻小区的哪个参数提高? Ba. T3212 b。

Cell_Reselect_Hysteresisc。

Cell_Reselect_offset d. Rxlev_Access_Min5. 一个小区 combined BCCH、MFR=6, AG=1情况下,计算有多少个Paging Group数目?a.6b.54c.48 d。

126. 在执行Direct Rrtry 功能时, Layer 3 message 出现哪一条信令? Ca。

Immediate assignment b. Assignment commandc。

Handover command d. Connect7。

MS占用Cell A,已经触发了切换门限,需要向处切换,目前有两个邻区做为目标小区候选,三个小区的具体情况为,电平值: Cell B=—85 dBm, Cell C=—95 dBm,Cell D=-90 dBm.. 邻区参数设置均相同,如下:btsLoadThreshold=80%hoLevPriority =3hoLoadFactor=2rxlevmincell (n)=-92 dBm. (Cell A à Cell B/C/D) the TCH load is Cell B=90%, Cell C=70%, Cell D=75%哪个小区为最佳候选a. CELL B b。

[整理]GSM网络基础知识---题库.

[整理]GSM网络基础知识---题库.

一、GSM网络知识基础(填空题)1、GSM的英文全称是____Global System For Mobile Communications__。

【考察知识点】GSM网络知识基础【题目难度】(1)级2、蜂窝系统采用技术以增加系统容量。

【考察知识点】GSM网络知识基础【题目难度】(1)级3、Ms 与基站之间的接口是Um接口__。

【考察知识点】GSM网络知识基础【题目难度】(1)级4、BTS与BSC之间的接口是:Abis接口__。

【考察知识点】GSM网络知识基础【题目难度】(1)级5、BSC与MSC之间的接口是:A接口__。

【考察知识点】GSM网络知识基础【题目难度】(1)级6、NSS是指:交换子系统主要包括哪几个单元:MSC 、HLR、VLR、AUC、EIR。

【考察知识点】GSM网络知识基础【题目难度】(1)级7、TC指的是码型变换器。

TC置于BSC 和MSC之间。

【考察知识点】GSM网络知识基础【题目难度】(2)级8、用户电话号码例如 139********在系统中被称为移动用户号码(MSISDN ) 。

【考察知识点】GSM网络知识基础【题目难度】(1)级9、IMSI 号码由MCC 、MNC、MSIN三部分组成,IMSI 长度为15位。

【考察知识点】GSM网络知识基础【题目难度】(1)级10、TMSI是由VLR 分配的,仅在该模块控制的区域内有效。

【考察知识点】GSM网络知识基础【题目难度】(1)级11、LAC区是指移动台可任意移动而不需要进行位置更新的区域,寻呼移动台时,系统将在一个位置区内的所有基站同时发寻呼消息。

【考察知识点】GSM网络知识基础【题目难度】(2)级12、BSIC 由NCC 和BCC 两部分组成。

【考察知识点】GSM网络知识基础【题目难度】(1)级13、GSM 900M 频段是:上行 890MHZ-915MHZ,下行 935MHZ -960MHZ 。

【考察知识点】GSM网络知识基础【题目难度】(1)级14、DCS1800M的频段是:上行 1710MHZ-1785MHZ,下行 1805MHZ-1880MHZ 。

GSM中心试题及答案1

GSM中心试题及答案1

GSM中心试题及答案1GSM理论基础考试试卷及答案一、填空题(每空1分共20分)1.移动通信系统目前采用_FDMA_、__TDMA_和__CDMA_三种多址方式,GSM采用FDMA/TDMA(或TDMA)多址方式。

2.GSM系统按照功能分为 NSS、BSS、OSS和 MS等三部分。

3.在GSM 系统一个载频可带有__8__个物理信道,其调制技术采用___GMSK___。

4.无线接口上CCCH包括 PCH 、 AGCH 、RACH三类信道。

5.华为M900/1800基站可支持星形、链形、树形和环形灵活组网。

6.在GSM系统中,移动台(MS)与基站(BTS)间传输的数字话音信号速率为13 Kbit/s, 移动交换局(MSC)与基站间传输的数字话音信号速率为 64 Kbit/s,因此在BSS 与MSC之间需增加码型变换设备。

7.根据规范要求,移动交换机房接地电阻应不大于 0.5 欧姆,基站机房的接地电阻应不大于 5 欧姆。

8.GT码转换表的翻译结果一般有两种,分别为:DPC和DPC+GT,其中DPC方式用在:省内,DPC+GT用在:省际间。

9.射频跳频时,一个小区内不同TRX的MAIO建议配置不同,不同基站的HSN建议配置不同。

10.在GSM系统中,接地系统的主要作用是:减少雷击破坏;减少人为噪声。

11.分集技术是对付快衰落的有效方法,在众多的分集技术中,我们目前最常用的是__空间分集__ 12.GSM业务有三类:电信业务、承载业务、补充业务。

13.DCS1800使用的频带宽度是75MHz,双工频率间隔是95MHz 。

14.切换一般是指MS在通话状态(空闲、通话)下由于位置改变而要进行的行为。

15.移动台实现DTX和VAD功能的目的是1、减小干扰;2、省电,延长通话时间。

16.LAI由三部分组成: MCC+MNC+LAC17.常规突发脉冲中训练比特有8种。

18.AUC的基本功能是产生三参数组RAND、 SRES 、 Ki 。

中国联通GSM无线试题和答案(诺基亚)

中国联通GSM无线试题和答案(诺基亚)

中国联通GSM无线试题和答案(诺基亚)一、选择题1.信令链路UA-AD状态表示:( B )A、LINK状态正常B、LINK 未允许激活C、已执行激活操作,但LINK未激活D、该LINK已被删除2.每块AS7-V插板最多支持处理( C )条64Kbit 信令A、4条B、8条C、16条D、32条3.创建ABIS口TRXSIG时,SAPI值应为(B )A、1B、0C、62D、任意4.监视基站重启动的service terminal扩展块的名称为:( A)A、RPHASEB、REOMMIC、MASHAND、REOMMI5.创建BSC信令点编码的命令为:(C )A、ZNPCB、ZNSCC、ZNRPD、ZNRC6.存放的是LAPD信令链路信息的电路组名称是( E )。

A、ETPCMB、OSIAS7C、ETT00D、DAS7UE、D30BD7.X.25信道由OMU单元中(B )板处理A、HWATB、AS7C、SEROD、SCSIF8.DX200软件平台文件中可用MML命令修改的数据文件是(B)A、工作文件B、配置文件C、循环文件D、软件文件10.通过MML命令对备用MCMU单元进行重启动操作时,若使用命令ZUSU:MCMU,0:R=WARM,C=DSK;时,该MCMU将(C)A、从硬盘装载软件代码及配置数据文件。

B、不装载软件代码,只装载配置数据文件C、从硬盘装载软件代码,从主用MCMU装载配置数据文件。

D、只装载软件代码,不装载配置数据文件11. 一个软件包的主文件为MAFILE文件,该文件存于(B)A、ASWDIRB、BLCODEC、LFILESD、SCMANA12. GSM网进化历程按照数据传输速率由大到小排布为(A)A、EDGE HSCSD GPRS GSMB、EDGE GPRS HSCSD GSMC、HSCSD EDGE GPRS GSMD、HSCSD GPRS EDGE GSM13. BSC显示终端的参数设置中,关于数据位,停止位和奇偶校验设置正确的是:( B )A 7,2,oddB 7,2,evenC 8,1,oddD 8,1,even14. BSC的MCMU单元1的MB的地址是 ( C )A 01B 04C 05D 1115. NOKIA 2I的BSC最多支持的载频数为(B )A. 448 B 512 C 660 D 102416. 下列哪种类型的PCU不能用于BSC2I的GPRS扩容?(D)A .PCU B.PCU_S C.PCU_T D.PCU_B17.当ET状态是SE-NH时,连到这个ET的传输线断开时能否看到告警?( B )A、能B、不能C、如果ET数据完整可以看到D、如果ET是120欧姆类型的可以看到18. BSC3i 每个BCSU最多能带多少个TRX?( B )A、64B、110C、128D、25619. 1个时隙的SDCCH信道有多少个子信道?( B )A、4B、8C、64D、5120. 以下哪一个ServiceTerminal 扩展可以用来查询观察CPU单元? ( C )A. RPHASESXB. MASHANDC. RCBUGGGXD. RCXPRO21. 517号频点对应的下行中心频率为( D)。

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姓名服务地市合作单位优化岗位优化工程师GSM网络优化考试卷注意事项:A.本试卷为GSM工程师网优水平考试题,考试时间为120分钟,闭卷考试。

B.应考人员在答题前,请将姓名、单位等信息认真准确地填写在答题纸的折线内。

C.应考人员应严格遵守考场纪律,服从监考人员的监督和管理,凡考场舞弊不听劝阻或警告者,监考人员有权终止其考试资格,没收试卷,以0分处理。

一、单项选择题(每题1分,共20分)1.以下是手机开机过程中需要占用逻辑信道的顺序,哪一项是正确的( A )A、FCCH-SCH-BCCH-RACH-AGCH-SDCCHB、FCCH-SCH-RACH-AGCH-SDCCHC、RACH-AGCH-SDCCH-TCH-SACCH-FACCHD、PCH-RACH-AGCH-SDCCH2.下面关于C1算法和C2算法的说明,哪个是正确的?( A )A、C1用于小区选择和重选,C2算法用于定位(Locating)。

B、C1算法用于定位(Locating),C2用于小区选择和重选。

C、C1算法用于Phase Two手机的小区选择和重选,C2算法用于Phase One手机的小区选择和重选。

D、C1算法用于Phase One手机的小区选择和重选,以及Phase Two手机的小区选择,C2算法用于Phase Two手机的小区重选。

3.在空中接口信令消息中,CHANNELREQUEST消息在下列哪个信道中发送: ( B )A、PCH;B、RACH;C、AGCH;D、SDCCH4.一个用户在忙时的一小时内进行了6分钟的通话,那么这个用户产生的话务量为( D )。

A、10毫爱尔兰;B、33毫爱尔兰;C、66毫爱尔兰;D、100毫爱尔5.若某小区的CCCH配置为一个非组合、接入允许保留块数为5、相同寻呼间帧数编码为6,则寻呼子信道数为( B )A、30B、24C、15D、126.从统计发现某小区掉话率偏高,仔细分析掉话原因,发现弱信号掉话率占近100%,那么以下分析错误的是( C )A.该小区可能漏定义了重要邻区B.该小区可能覆盖太远C.该小区的ACCMIN设得太低D.该小区有硬件故障7.为了实现周期位置更新功能,定时器设在哪些网络实体里?( C )A、MSC、BSC和MS。

B、MSC和BSC。

C、MSC和MS。

D、BSC和MS。

8.新开站时,假如MSC定义小区的CGI与BSC定义小区的CGI不一致,会出现以下哪种情况?( C )A、该小区无话务B、接入失败过多,信令接通率低C、手机不能起呼D、邻区的呼叫无法切入该小区9.以下关于测量报告的描述,哪个是错的?( B )A、它包含了当前小区的信号强度和信号质量,以及最多六个最好的邻近小区的信号强度。

B、当移动台空闲时通过SDCCH来传送测量报告,而当移动台处于通话状态时通过SACCH来传送。

C、BTS收到测量报告后,会将上行信号强度和信号质量加进测量报告,并传送BSC处理。

D、测量报告大约每480ms传送一次。

10.你对天线的增益(dBd)是如何认识的?( C )A、这是一个绝对增益值。

B、天线是无源器件,不可能有增益,所以此值没有实际意义。

C、这是一个与集中幅射有关的相对值。

D、全向天线没有增益,而定向天线才有增益。

11.适用于密集城区的站型及天线选型是( B )A、全向基站B、3小区基站,水平65度,增益15.5dbi左右C、3小区基站,水平65度,增益18dbi左右D、3小区基站,水平90度,增益15.5dbi左右12.若直放站的收发天线之间的隔离度不能达到要求,会对系统造成什么影响:( C )A、上行信号增益过大B、下行信号增益过大C、系统自激D、天线不工作13.1毫瓦与1瓦约相差多少? ( B )A、10 DbB、30 dBC、1000dBD、100 Db14.对于路由区编码RAI,下列哪个描述是正确的:( D )A、RAI=MCC+MNC+LAC;B、RAI=MCC+MNC+LAI;C、RAI=MCC+MNC+RAC;D、RAI=MCC+MNC+LAC+RAC。

15.切换过程中,下面哪条信令是异步切换独有的?( A )A、PHYSICAL INFOMATIONB、HANDOVER DETECTIONC、HANDOVER COMMANDD、HANDOVER COMPLETE16.以下有关GSM系统中BSS内对T3103进行设置的目的,以及设置原则说法正确的是:( A )A纯粹为了限制切换的时间,使切换过程不要持续时间太长,并且设置值不能大于RadioLinkTimeOut。

B.为了限制切换的时间,使切换过程不要持续时间太长浪费系统资源,并且设置值不能小于RadioLinkTimeOut。

C.T3103在BSC发出切换命令之后开始计算,收到建立提示命令后清零,算切换成功。

D.T3103在BSC发出切换命令之后开始计算,只有收到切换失败命令后才清零。

17.GPRS无线传输以下那一种编码方式Coding Scheme 的纠错能力是最高的:( A )A、CS-1B、CS-2C、CS-3D、CS-418.关于GPRS MM状态,下列说法正确的是( C )。

A、MS在空闲、待命和就绪状态下都可以接收分组寻呼,但只有就绪状态下才能传送数据B、MS只有在待命状态下才能接收分组寻呼,在就绪状态下才能传送数据C、MS在待命和就绪状态下都可以接收分组寻呼,但只有就绪状态下才能传送数据D、MS在空闲、待命状态下都可以接收分组寻呼,但只有就绪状态下才能传送数据19.全速率业务信道和半速率业务信道传送数据最快速度分别为( C )。

A、13kbit/s、6.5 kbit/sB、11.2kbit/s、5.6 kbit/sC、9.6kbit/s、4.8 kbit/sD、4.8kbit/s、2.4 kbit/s20.造成下行高BLER的原因不包括下列那些因素( D )A、服务小区信号弱B、干扰小区功率大C、小区覆盖不合理D、手机发射功率设置不合理二、多项选择题(每题全答对得2分,共10分)1.不连续发射(DTX)的目的是( AD )A、减少整个系统的干扰B、提高频谱利用率C、节约无线信道资源D、延长移动台的电池的寿命2.在GSM规范中,有两个参数用来定义跳频序列,分别为: ( AC )A、MAIOB、TFIC、HSND、USF3.下列情况中,可能引起某小区信号过覆盖的原因有:(ABCDE )A、天线设置过高B、相邻关系缺失C、切换不及时或困难D、水面反射E、相邻基站硬件故障4.关于指配以下说法错误的是:(无答案)A、早指配和及早指配的区别是后者的指配流程在Alerting消息之后,其它方面没有差别B、及早指配的缺点,如果后续指配不成功,会造成被叫用户听到振铃却不能打通电话,从而易导致用户投诉C、及早指配:在没有SDCCH信道或紧急呼叫(要求及早指配)等情况下,在立即指配SDCCH时,直接选择一个TCH信道作为SDCCH信道使用D、正常的指配为早指配,早指配的整个过程是串行的,比较慢。

5.对于由于“孤岛效应”导致的掉话问题,如果不进行实地路测,可以通过话统台上哪些指标分析出来?(ABCDE )A.从功率控制性能测量中,是否平均上下行信号强度过低;B.从接收电平性能测量中,接收电平低的次数所占比例过大;C.在小区性能测量/小区间切换性能测量中,发起切换时电平等级过低,平均接收电平过低;D.掉话性能测量中,掉话时电平过低,掉话前TA值异常,超出预期的覆盖范围的TA值;E.功率控制性能测量,MS与BTS的最大距离(TA值),连续多个时段超常;6.请问下列关于天线的描述哪些是正确的? ( ABCD )A、天线的机械下倾角度过大会导致天线方向图严重变形(即主瓣前方产生凹坑)B、电子下倾通过改变天线振子的相位使得波束的发射方向发生改变,各个波瓣的功率下降幅度是相同的C、当天线下倾角增大到一定数值时,天线前后辐射比变小,此时主波束对应覆盖区域逐渐凹陷下去,同时旁瓣增益增加,造成其它方向上同频小区干扰D、当天线以垂直方向安装时,它的发射方向是水平的,由于要考虑到控制覆盖范围和同频干扰,小区制的蜂窝网络的天线一般有一个下倾角度7.如果在某地方,MS在空闲状态下信号不稳定,最可能是什么原因是:(ABD )A、可能与MSRXMIN设置不合理有关B、可能与重选参数有关C、可能与双频网切换参数设置不当有关D、可能与基站的硬件性能有关8.下面关于第3层信令信息说法正确的是( BCD )A、IMMEDIATE ASSIGNMENT是指分配TCHB、PHYSICAL INFORMA TION中含有TA信息;C、CHANNEL REQUEST发起的原因主要有:MO, MT, LOCA TION UPDATE;D、AG主要用于对RACH的回应;9.掉话与切换失败有那些共同的可能原因:(ABCD )A、干扰程度较高B、硬件有故障C、天馈线联接方向错误D、越区10.从路测中我们可以看到一些什么信息( ADEF )A、下行接收质量和下行接收电平B、上行接收质量和上行接收电平C、邻区信号强度和信号质量D、跳频状态E、呼叫事件F、Layer3层信令信息三、填空题(每格0.5分,共9分)1.GSM系统中,TCH信道为26复帧结构,26帧的GSM复帧时间间隔为 120ms ,每 4 个TCH复帧传送一个测量报告。

2.GSM网络中唯一识别移动台的号码是 IMEI ,而在公共电话交换网中唯一识别移动台的号码是 MSISDN 。

3.当一个tdma帧的结构是TS0=BCCHSDCCH4CBCH;TS1~TS7=TCH时,请说出有1个bcch信道、 4 个sdcch信道、 1 个cbch信道;4.GPRS移动性管理包含 IDLE 、STANDBY保持和 READY 三种状态。

5.无线信号在水面传播比在空气中传播的损耗小,无线信号的频率越高,在空气中传播的损耗越大;6.GSM对C/I的要求,同频干扰保护比 >= 9 dB,邻频干扰保护比>= -9 dB。

7.激活tch分配排队等候功能,可降低过忙小区的溢出率,并提高小区话务承载努力。

代价是延长接续时间和占用部分 SDCCH 资源。

8.某城市的GSM网络目前拥有10000个手机用户,假定平均每个用户在忙时有三次呼叫,平均每次呼叫时长为1分钟。

计算该城市在忙时的每用户话务量和总话务量。

每用户话务量: 0.05ERL 总话务量: 500ERL9.发生掉话时,BSC会上发一条 clear request 消息给MSC。

10.在双频网中网络是通过手机上报的 classmark3 信息知道手机的频段能力。

四、简答题(33分)1.路测中发现某个小区覆盖区域过大,你觉得可能是哪些原因引起?可以尝试那些技术手段调整?(4分)答:可能原因:1)天线过高;2)天线俯仰角过小;3)邻区漏配;4)切换参数设置不合理;5)信号反射;6)切换目标小区故障;调整手段:1)降低天线高度;2)增大天线俯仰角;3)补齐邻区关系;4)优化切换参数,加快切换;5)结合周边环境,减少信号反射;6)排除切换目标小区故障;2.请简要描述高速公路优化思路( 4分)答:首先要了解高速GSM网络整体覆盖情况。

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