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1. The _ temporarily stores information about the MS currently visiting its Service Area?(1) VLR(2) HLR(3) EIR2. Which of the following numbers is the directory number of a subscriber in a GSM/PCS network?(1) IMSI(2) MSISDN(3) MSRN3. What is the interface between MSC and BSC known as?(1) A-interface(2) Abis-interface(3) B-interfaceXxx4. The interface between BSC and the BTS is known as?a) A-interfaceb) A-bis-interfacec) B-interfaceXxb5. The normal cell maximum radius for GSM is?a) 35 kmb) 70 kmc) 50 kmxxx6. Which unit is used for the transcoding of speech information?a) TRAU(TC)b) TRHc) TRX7. The two different types of multiframes are?a) 13- and 26-frameb) 26- and 51-framec) 51- and 102-framexxb8. The Cell Identity is unique to?a) The Location Areab) The MSC/VLR Service Areac) The PLMN9. What type of interference is produced by other transmitters on the same requency?(1) Double interference(2) Co-channel interference(3) Adjacent channel interference(4) Reflected interference(5) Timing interferenceXxx10. What property of a cell is limited by timing advance?(1) Number of simultaneous calls(2) Frequency of call setups(3) Radius(4) Antenna length(5) ColorXxb11. What is the idea of using a combiner?(1) Up to four sites can share one PCM link(2) Several TRXs can share one antenna system(3) The mobile can listen to two base stations at the same time(4) Only one base station is needed per site(5) Sending and transmitting can be performed from the same antennaXxx、xxb12. Which of the following is the nominal output power for a GSM 900 class 4 or GSM 1800/GSM 1900 class 1 mobile station?(1) 27 dbm(2) 29 dbm(3) 31 dbm(4) 33 dbm(5) 35 dbm13. Why are base stations sometimes cascade/chain(级连) connected?(1) To save antennas(2) To be able to reuse frequencies(3) To share RBS equipment(4) To simplify the installation(5) To share PCM linksXxx、xxb14. A transmitted signal is received at -50 dBm and there is -150 dBm interference at the same frequency. What is C/I?(1) 12 dB(2) 30 dB(3) 50 dB(4) 80 dB(5) 100 dB15. Frequency Hopping _ .(1) Improves the speech quality of slow moving vehicles.(2) Reduces the effects of Co-Channel Interference.(3) Improves the efficiency of the PCM link.(4) Both A and B.16. How many timeslots per carrier?(1) 8(2) 3(3) 32(4) 1617. What is the transmission rate over the “air interface” in GSM?(1) 64 kbps(2) 13 kbps(3) 270 kbps(4) 9.6 kbpsxxx、xxb18. In GSM which of the following is the Uplink frequency range? GSM 1900 GSM 1800 GSM 900(1) 1840 - 1920 MHz 1700 - 1790 KHz 880 - 925 KHz(2) 1930 - 1990 KHz 1805 - 1850 KHz 935 - 960 KHz(3) 1850 - 1910 MHz 1710 - 1785 MHz 890 - 915 MHz(4) 1920 - 1980 MHz 1820 - 1870 MHz 925 - 970 MHz19. A duplex filter _.(1) makes it possible to transmit and receive, using the same antenna(2) is used for TX diversity(3) makes it possible to combine received signals.(4) both A & B20. Which node does not belong to the Switching System/Network Switching System?(1) AUC (2) BSC(3) MSCXxx21. What information is checked by the EIR?a) The subscriptionb) The telephonec) The subscriber categoryXxb22. What is the area called where a mobile station is paged?a) Paging areab) Location areac) Service areaXxx、xxb23. Why might two receiver antennas be mounted on a base station?a) To improve the received signal strengthb) One spare if the other one failsc) One for each direction to/from the mobileXxx、xxb24. What is the common name for RAND, Kc and SRES?a) Mobile number groupb) Tripletc) Triple group25. Which timing information is used for ciphering?a) Call durationb) TDMA frame numberc) The time of the day when the call is made26. After the TRC, in the direction towards the BSC, which is the bitrate per traffic channel?a) 22.8 kbits/sb) 64 kbits/sc) 16 kbits/s27. Where is speech coding performed in GSM systems?a) The MS and the MSCb) In the MS and the TRCc) In the BSC and the TRCXxb28. Which unit enables several transmitters connected to the same antenna?a) Combinerb) Transceiver unitc) Antenna diversity29. Which of the following identity numbers is dialed when making a call to an MS?a) MSISDNb) IMEIc) IMSI30. When is IMEI used?a) When the subscription belongs to a rental phoneb) When it is necessary to identify the MS equipmentc) As a temporary personal code to be able to use the MS equipment31. Which identity is used to denote a specific cell?a) CGIb) BSICc) LAI32. What is a change of cells during conversation called in GSM?a) Handoverb) Roamingc) Active33. Why is Periodic Registration performed?a) To inform the network that the MS is detachedb) To inform the network that the MS is attachedc) To page the MSXxx34. What is the meaning of multi-drop?(ericsson)(1) A quick way of decreasing the temperature inside the cabinet.(2) Cascading of PCM-links between RBSs.(3) A quick way of decreasing the output power of the TRUs.(4) All calls are dropped when you push the reset button on one of the TRUs.35. Which unit is used for measuring traffic?1、 Erlang2、 Bit/second3、 Hertz4、 Subscribers/kHz5、 Subscribers/minute36. LAI是在什么信道上发送的?(1) PCH(2) BCCH(3) RACH(4) SCH37. 目前中国移动用户号码已升为11位,这11位是指MSISDN中的_。A) CC 和NDCB) CC和SNC) NDC和SND) CC、NDC和SNXxx、xxb38. 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 参数提高?A) T3212B) Cell_Reselect_HysteresisC) Cell_Reselect_offsetD) Rxlev_Access_Min39. 如果一个网络运营商分别有15 MHz的上、下行频宽,那么他可以获得多少个GSM频点 (减去一个保护频点)?A) 600B) 599C) 75D) 74xxx40. 由于阻挡物而产生的类似阴影效果的无线信号衰落称为:A) 多径衰落B) 快衰落C) 慢衰落D) 路径衰落41. 1毫瓦与1瓦约相差多少?A)20 dBB)30 dBC)1000dBC)100 dBXxb42. 以下哪个现象不存在模拟网,而只存在于数字无线网中?A)瑞利衰落B)拥塞C)快衰落D)码间干扰Xxb43. 假设一个用户在一小时内分别进行了一个两分钟及一个四分钟的通话,那么他在这一小时内产生了多少话务?A)10 millierlangsB)50 millierlangsC)100 millierlangsD)200 millierlangsXxx44. 移动台功率控制带来的好处是:A)延长移动台的电池使用时间B)获得更好的Bit Error Rate(BER)C)获得更高的接收信号强度D)获得更好的话音质量Xxx、xxb45. Locating是指:A)在多于一个小区的范围内对手机进行寻呼B)选择最佳小区C)对移动台进行定位D)漫游46. 天线增益是如何获得的?A)在天线系统中使用功率放大器B)使天线的辐射变得更集中C)使用高效率的天馈线D)使用低驻波比的设备Xxx47. 无线信号在水面上传播比在空气中传播的损耗_,无线信号的频率越高,在空气中传播的损耗越_。A)大、大B)小、小C)大、小D)小、大Xxb48. 1W_dBmA)10B)20C)30D)3349. GSM系统使用的多址方式为_。A)FDMAB)TDMAC)CDMAD)FDMA+TDMA50. GSM系统中时间提前量(TA)的一个单位对应空间传播的距离接近 米A) 450B) 500C) 550D) 60051. 下列信道中不属于DCCH信道的是:A:RACH B:SDCCH C:SACCH D:FACCHXxb52. 下列信道中不属于CCCH信道的是:A:RACH B:AGCH C:SDCCH D:PCHXxx53. 下列哪种技术不能有效降低网络干扰:A:同心圆 B:功率控制 C:LOW LOSS改造 D:跳频Xxx54. 下列哪种方法能够有效降低网络拥塞:A:直接重试 B:功率控制 C:跳频 D:DTXXxb55. 路测仪表一般能够解决下列哪些工作:A:网络干扰 B:掉话分析 C:切换分析 D:ABCXxb56. 下列哪个因素不影响小区的覆盖距离:A:基站天线高度 B:天线方位角 C:基站设备发射功率 D:天线俯仰角Xxx、xxb57. 对于话务热点地区有效的吸收话务方法为:A:微蜂窝室内分布系统 B:直放站室内分布系统 C:跳频 D:同心圆小区Xxx58. 在全速率或半速率信道上通过不同的速率适配、信道编码和交织,支撑着不同速率的透明和非透明数据业务。以下哪些不是GSM支持的速率。(1) 9.6kbit/s(2) 4.8kbit/s(3) 2.4kbit/s(4) 11.4kbit/sxxb59. 基站识别码(BSIC)在信道编码之前,占有 。A) 3比特B) 6比特C) 8比特D) 12比特xxx60. AUC的基本功能是产生三参数组(RAND、SRES、Kc),其中RAND由随机数发生器产生,SRES由RAND和Ki由 得出,Kc由RAND和Ki用 算出。A) A8、A3B) A3、A5C) A3、A8D) A5、A8Xxb61. In which surroundings is the time dispersion problem most severe?A) In the desertB) In hilly terrain with many lakesC) IndoorsXxx62. Which of the following is handled by the BSC?A) Measurements on the radio connectionB) Allocation of the radio channelsC) Local switching63. CDMA系统对GSM系统可能产生的频率干扰为:A:下行干扰 B:上行干扰 C:上下行均干扰 D:CDMA不会对GSM产生干扰Xxx64. MS在IDLE模式下一般对哪个信道守侯监听:A:AGCH B:BCCH C:SACCH D:FACCH65. 根据TA值原理为计算依据,一般认为GSM900小区最大覆盖范围为:A:15KM B:20KM C:35KM D:无限大66. AIS告警的基本含义为A:对端告警 B:远端告警 C:2M丢失 D:误码Xxx67. LOSS OF 2MB/S的基本含义为A:对端告警 B:远端告警 C:2M丢失 D:误码Xxb68. 现网宏蜂窝基站主设备使用的电源为A:直流电或两相电 B:直流电 C:两相电 D:三相电 Xxx69. 当用测试手机测试时,手机显示TA=8时,则可以粗略推算手机离基站的距离为A:8KM B:4KM C:5KM D:4.4KMXxb70. 两载频的小区中,最多可以让多少部手机同时进行通话(不考虑半速率情况)(D)A:14 B:13 C:16 D:15Xxx、xxb71. 关于基站防雷接地说法正确的是(B)A:铁塔接地与基站主设备接地不能互连,以防雷电引入B:铁塔接地与基站主设备接地必须互连。C:天馈线系统需两点接地D:设备已安装了避雷器,因而主设备可以不接地Xxx72. 在基站建设设计中对接地电阻的要求为(A)A:小于1欧姆 B:小于2欧姆 C:小于3欧姆 D:小于0.5欧姆Xxb73. 下列哪种仪表在检查干扰问题时不会使用(D)A:信令仪表 B:路侧仪表 C:频谱仪 D:功率计Xxb74. 切换是移动网络的基本特点,下列关于切换说法正确的是(D)A:触发切换只有两种原因:电平、质量B:切换过程中通话要瞬间间断C:切换成功率不影响网络指标D:切换会对网络掉话率和系统接通率产生重大影响Xxx75. 下列哪种仪表不能测试基站发射功率(D)A:功率计 B:频谱仪 C:基站综合测试仪 D:频率计Xxx76. BTS与BSC之间接口名称与使用的协议为(C)A:UM、LAPDm B:ABIS、LAPDm C:ABIS、LAPD D:RSL、BSSMAPXxb77. 下列哪种情况下肯定不会发生位置更新过程(B)A:当计数时间达到T3212值时B:当手机发生小区内切换时C:当手机从一个
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