无线网优练习题 带答案.docx

1、无线网优练习题 带答案无线网优练习题一 单选题1. 无线接入信道属于随机和突发干扰并存的变参信道, 因此一般都要使用差错控制编码技术以保证数字信号和信令的可靠传输, _B_是其主要采用的差错控制方式. A. ARQ B. FEC C.BCH2. 下面哪个单元通常与MSC放在一起统一管理?_A_ A. VLR B. HLR C. AUC D. EIR3. GSM系统中, 用户寻呼所使用的标识码为:_B_ A. 11位拔号号码 B. IMSI号码或TMSI号码 C. 动态漫游号码 D. 以上皆可4. 在一个城市的GSM系统内, 小区识别码CGI:_A_ A. 是唯一的 B. 可以有两个小区相同 C

2、. 可以有三个小区相同 D. 可以有任意多个小区相同5. GSM系统中, 小区切换由谁控制?_D A.MSC B. 手机 C. AUC D. BSC6. BCCH载波不跳频, 应理解为: C A. 在小区设备中, 总有一套载波设备不参与跳频 B. OML-TGC功能固定在某一个TRX上激活 C. BCCH脉冲串固定在某一个频点上发送 D. 当使用混合跳频时(HOP=SY), 无法实现此功能7. 无线信号在水面上传播比在空气中传播的损耗_D_, 无线信号的频率越高, 在空气中的传播损耗越_ A. 大, 大 B. 小, 小 C. 大, 小 D. 小, 大8. 移动台开户数据和当前数据分别存放于:_

3、A_ A. HLR, VLR B.VLR, HLR C. VLR, MSC D. MSC, VLR9. Locating是指:_B_ 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.10. 假设一个用户在一个小时内分别进行了一个两分钟及一个四分钟的通话, 那么他在这一个钟内产生了多少话务?_C_ A. 10millierlangs B. 50millierlangs C. 100millierlangs D. 200millierlangs11. 如果使用LAPD Concentration技术传输某三个载波小区的话音与信令Confact为4,则需要

4、使用A-bits接口上PCM链路的多少个时隙?_C_ A. 4个 B. 6个 C. 7个 D. 9个12. 一个功率为20dBm的输入信号经过一个四功分器后, 它的信号强度为:_D_ A. 23dBm B. 17dBm C. 15dBm D. 14dBm13.以下_C_项不是空闲模式下的任务. A. 位置更新 B. 监听寻呼消息 C. 把测量报告送BSC D. 小区选择和重选14. GSM900系统中相邻频道的间隔和双工间隔为:_B_ A. 25KHZ和45MHZ B. 200KHZ和45MHZ C. 200KHZ和75MHZ D. 200KHZ和95MHZ15. 移动台在通话状态时HLR和M

5、SC分别知道移动台在哪个区域?_D_ A. HLR知道MS在哪个MSC服务区, 而MSC知道MS在哪个位置区域(LAI) B. HLR知道MS在哪个MSC服务区, 而MSC知道MS在哪个BSC服务区 C. HLR知道MS在哪个BSC服务区, 而MSC知道MS在哪个位置区域(LA) D. HLR知道MS在哪个MSC服务区, 而MSC知道MS在哪个小区(CGI)16. 200基站的小区馈线要装3条, 2000基站的小区馈线要装2条, 原因是:_A_ A. 200基站不采用双工器而2000基站采用双工器 B. 200基站与2000基站采用的合成器类型不同 C. 2000基站采用双极化天线, 而200

6、基站不采用双极化天线 D. 其它原因17. 跳频能有效改善以下哪种现象:_C_ A. 单通 B. 时间扩散 C. 多径衰落 D. 互调干扰18. 我公司GSM采用的是哪种接入方式:_B_ A. FDMA B. TDMA C. CDMA D. 上面三种都可以19. 我公司使用的频率范围是:_B_ A. 450M B. 900M和1800M C. 2G D. 3G20.GSM每个频点的带宽是:_C_ A. 10G B. 1G C. 200K D. 2G21. GSM系统大致可分为:_B_ A. 传输系统和交换系统 B. 交换系统和基站系统 C. 传输系统和基站系统 D. 交换系统和寻呼系统22.

7、基站控制器的英文缩写是:_C_ A. MSC B. HLR C.BSC D.BTS23. 目前广东移动网络GSM无线系统的主要厂家是:_A_ A. 爱立信 B. 摩托罗拉 C. 诺基亚 D. 华为24. 基站覆盖范围与以下哪些个因素无关:_D_ A. 天线高度 B. 天线类型 C. 基站发射功率 D. 用户25. 爱立信GSM中, 全速率话音信道的比特率为:_A_ A. 13Kb/s B. 64Kb/s C. 6.5Kb/s D. 2Mb/s26. -10DBm的无线信号比-20DBm的无线信号强:_A_ A. 对 B. 不对 C. 不能确定 D. 不可比较27. 爱立信系统中, BSC与MS

8、C的逻辑地位是:_A_ A. MSC高 B. BSC高 C.无法确定 D. 一样高28. 在我公司的GSM系统中, 存放用户数据的归属位置寄存器的英文缩写是:_A_ A. HLR B.MSC C. VLR D.BTS29. 基站与BSC之间的接口叫:_D_ A. C接口 B. B接口 C. Um接口 D.A-bits接口30. TA限制了小区的什么特性?_C_ A. 允许同时的通话数量 B. 呼叫建立的频率 C. 半径 D. 天线长度31. 应用跳频技术时, BCCH载波不能跳频的时隙是:_A_ A. TS0 B. TS1 C. TS7 D. TS832. 30/32的PCM系统中, 用于传输

9、同步信号的时隙是:_A_ A.0时隙 B. 16时隙 C. 28时隙 D.32时隙33. 下列哪种情况, 不需做位置更新:_D_34. IMSI Detach and IMSI Attatch信息存储在哪个网络单元中:_C_ A. BSC B. HLR C. MSC/VLR D. BTS35. 向基站传送测量报告的时间周期约为：_D_ A. 1秒 B. 2秒 C. 10毫秒 D. 0.5秒36. 目前的GSM系统使用的调制方式为:_C_ A. FSK B. FM C. GMSK D. PM37. 以下哪种不是GSM的系统的控制信道:_C_ A. 广播信道(BCH) B. 话音信道(TCH) C

10、. 公共控制信道(CCCH) D.专用控制信道(DCCH)38. 空闲模式下, 短消息通过哪个逻辑信道完成发送:_B_ A. BCCH B. SDCCH C. SACCH D.FACCH39. 若定义移动台的最大发射功率为33dBm, 则其对应的功率为多少瓦?_C_ A. 5W B. 10W C. 2W D. 1W40. 在空闲状态下手机用户改变所属小区会通知网络吗?_C_ A. 会 B. 不会 C. 会, 如果同时改变了位置区 D. 会, 如果同时改变了所属BSC41. 假设一部手机正在通话, 此时有一个短消息发给它, 那么短消息会占用哪个逻辑信道:_C_ A. BCCH B.SDCCH C

11、. SACCH D. FACCH第二部分1. 跳频能有效改善以下哪种现象:_C_ A. 单通 B. 时间扩散 C. 多径衰落 D. 互调干扰2. 在通话模式下, 网络通过_B_信道传送系统消息 A. BCCH B.SACCH C.SDCCH3. 在小区选择中, MS至少在5Min内对_A_个最强的非服务小区的BCCH载波进行BCCH数据块的解码. A. 6 B. 5 C. 4 D. 74. “CHANNEL REQUEST”这个消息是在_A_信道上发送的 A. RACH B. AGCH C. PACH D. SDCCH5. 在切换中, “HANDOVER PERFORMED”这条消息是从_D_

12、 A. MSC发向BSC B. BSC发向MSC C. MS发向BSC D. BSC发向MS6. 移动台在以下哪种情况下开始可以进行切换?_C_ A. 移动台切换到AGCH时 B. 移动台切换到TCH时 C. 移动台切换到SDCCH时 D. 移动台完成分配后7. The information contained in one timeslot on the TDMA frame is called a _B_ A. traffic channel B. burst C. control channel8. The A-ter interface is used between these 2

13、 nodes:_C_ A. BSC-BTS B. MSC-BSC C. TRC-BSC9. Transceiver Handler(TRH) is used for _A_ A. LAPD signaling B. Encoding and decoding of speech and rate adaptation of data C. Switching of bits rates lower than 64kb/s10. 以下关于切换的描述, 哪个是错的?_B_ A. 从高层小区切向低层小区的切换具有最高优先等级 B. 当移动台在通话质差很严重时会出现质差切换 C. 在设置正常的系统中,

14、 大部分切换是使移动台切往通话质量较好的小区 D. 两次切换间的最小时间间隔是可以定义的11. The SS7 signaling is made up of a Massage Part(MTP) and a number of User/Application Parts(UP).What User or Application Part is used for signaling between the BSC and the MSC in the GSM network ?_B_ A.MAP B. BSSAP C. OMAP12. 13.14.15.16.Which of the fo

15、llowing effects the size of the cell ?_A_ A. The type of BSC that the BTS is connected to B. Timing Advance C. Number of cells in a cluster 17. Which of the following groups of cells would be most likely to be used in a city area ? _B_ A. Umbrella, Micro and Pico B. Omnidirectional, Sector and Overl

16、aid C. Underlaid, Overlaid and Omnidirectional18. Which logical channel transmits the BSIC of a cell? _B_ A. BCCH B. SCH C. RACH19. Where are measurement report, which determine handover a cell, carried out? _A_ A. BSC and MS B. MS and BTS C. MS and MSC20. The MS is close to the cell border defined

17、by the timing Advance. The BSC compares the current average value of TA to the defined value timing Advance LIMit(TALIM) if TA exceeds the limit, what happens? _A_ A. A attempt is made to handover the call to a neighbouring cell B. An intercell handover takes place C. The TALIM is increased until a

18、handover can be effect 21. The maximum timing Advance(TA) allow in GSM is? _B_ A. 63 bit periods B. 128 bit periods C. 2048 bit periods22. Which unit performs LAPD concentration multidrop? _C_ A. GS B. TRAU C. SRS23. Intracell Handover involves: _A_ A. Change of timeslot only B. Change of frequency

19、only C. Change of timeslot and change of frequency24. The normal cell maximum radius for GSM is ?_A_ A. 35km B. 70km C. 50km25. Which of the following types of signals would carry the information “Location updating request”?_B_ A. Initial MS message B. BSSMAP C. DTAP26. Which unit is used for the tr

20、anscoding of speech information? _A_ A. TRAU B. TRH C. TRX27. What is a MO?_C_ A. A logical representation of software in the BTS B. A logical representation of hardware unit in the BTS C.A logical representation of hardware unit and software in the BTS28. Which of the following statements is incorr

21、ect? _B_ A. One TG consists of up to 16 TRXs B. One TG can be connected to a maximum of 32 cells C. A cell can be connected to one only29. The two different types of multiframes are? _B_ A. 13-and 26-frame B. 26-and 51-frame C. 51-and 102-frame30. When a MS is powered on what happens?_B_ A. The MS s

22、cans the radio frequencies of the network B. The mobile scans the frequencies carrying the BCCH channels only C. The mobile scans the frequencies carrying the BCCH channel of the neighboring cells only31. CALL CONFIRMFD is a signal sent from the MS in the MSC for the purpose of ?_A_A. Responding to

23、SETUP signal from the MSC B. Responding to the AUTHENUCATION REQUEST signal from MSC C. Responding to the PAGING COMMAND form the MSC32. Which of the following is used by the BTS and MS in providing security for the speech and data over the air interface?_B_ A. K1 B. Kc C. SRES33. The subsystem that

24、 id connected with the PCM links is ?_B_ A. RCS B. RTS C. TAS34. he following: Normal, IMSI detach, IMSI Attach, Periodic Registration are all forms of :_A_ A. Location Updating B. Authentication C. Paging35. Which of the following is false regarding Location Areas?_B_ A. One Location Area can belon

25、g to several BSCs B. One Location Area can belong to several MSCs C. One Location Area is always handle by only one MSC36. Why is TMSI used? _B_ A. As a temporary personal code to access the network B. For security reasons C. For use with a rented mobile telephone37. Which of the following channels

26、operation in bit-stealing mode?_C_ A. SDCCH B. SACCH C. FCCH38. Timers are used for Periodic Location Updating. Where are these timers located?_B_ A. MS and MSC B. MS and BSC C. BSC and MSC39. The cell Identity is unique to? _C_ A. The Location Area B. The MSC/VLR Service Area C. The PLMN40. How man

27、y traffic channels can maximum be handled by a TRX?_C_ A. 1 B. 4 C. 841. How many TS are required on the A-bis interface per TRX if LAPD?_C_ A. 2 B. 2.5 C. 342. How many TSs and Els are required to connect the following access network to a BSC when a DXC is used to get maximum utilization of the Els

28、? Access network with 30 sites of type 3/3/3 and 20 sites of type 2/2/2. LAPD-multiplexing and LAPD-concentration is used._C_ A. 870TSs, 29Els B. 848TSs, 28Els C. 780TSs, 26Els 43. Is flat, meshed network architecture best used in small, large or medium network?_ A. Small B. Medium C. Large44. How m

29、any physical connections are required in a network with 10 MSCs in a flat fully meshed network and in a hierarchical transit network with two transit?_A. 100(meshed),10(transit) B. 45(meshed),20(transit) C. 100(meshed),20(transit)45. A link set has three signaling links, on which load sharing is use

30、d and the maximum load per signaling link is 30%.What will be the maximum signaling volume that can be carried on this link set?_ A. 192kbit/s B. 57,6kbit/s C. 51,2kbit/s46. What is the difference between message transfer on a) MTP and b) SCCP level is STP?_ A. a)GTT is in STP b)no GTT in STP B. a)n

31、o GTT is in STP b)GTT in STP C. no difference47. Calculate the signaling volume generated on the A interface in the PLMN shown below Input data: 50000 subscribers, traffic per subscriber is 25 mE, MHT=100s, number of location updates=1 per/subscribers/busy hour, octets/call (to BSC/TRC)=270,octets/c

32、all(from BSC/TRC)=2,octets/location updating(to BSC/TRC)=130, octets/location updating(from BSC/TRC)=87_ A. 79,1kbit/s B. 42,4kbit/s C. 414kbit/s48. Which of the following is not valid SDCCH configuration?_A_ A. SDCCH/4 combined with CCCH on timeslot one B. SDCCH/4 including CBCH combined with CCCH on timeslot