网优疑难试题Word格式文档下载.docx

1、A.50欧姆B.75欧姆C.120欧姆1个2M传输不用信令压缩的情况下最多可以开通几个载波：A.9个B.10个C.12个D.15个在切换中，“HANDOVER PERFORMED”这条消息是从的。A.MSC发向BSCB.BSC发向MSCC.MS发向BSCD.BSC发向MSThe 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 a

2、nd the MSC in the GSM network?A.MAPB.BSSAPC.OMAPWhat part was added to the MTP in the SS7 signaling system to enable it to support connection-orientated and connection-less signaling? 正确答案应该是C A.ISUPB.TCAPC.SCCPCALL CONFIRMED is a signal sent from the MS to the MSC for the purpose of?A.Responding to

3、 SETUP signal from the MSCB.Responding to the AUTHENTICATION REQUEST signal from MSCC.Responding to the PAGING COMMAND from the MSCWhich of the following is used by the BTS and MS in providing security for the speech and data over the air interface?A.K1B.KcC.SRESWhy is TMSI used?A.As a temporary per

4、sonal code to access the networkB.For security reasonsC.For use with a rented mobile telephoneTimers are used for Periodic Location Updating. Where are these timers located?aA.A） MS and MSCB.B） MS and BSCC.C） BSC and MSCHow many TSs and E1s are required to connect the following access network to a B

5、SC when a DXC is used to get maximum utilization of the E1s? 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.CA.870 TSs, 29 E1sB.848 TSs, 28 E1sC.780 TSs, 26 E1sWhat is the difference between message transfer on a） MTP and b） SC

6、CP level in STP?A.a） GTT is in STP, b） no GTT in STPB.a） no GTT in STP, b） GTT in STPC.no differenceCalculate the signaling volume generated on the A interface in the PLMN shown belowInput data: 50 000 subscribers, traffic per subscriber is 25mE, MHT = 100 s, number of location updates=1 per/subscri

7、ber/busy hour, octets/call （to BSC/TRC）=270, octets/call （from BSC/TRC） = 280, octets/location updating （to, BSC/TRC） = 130, octets/location updating （from BSC/TRC） = 87.A.79,1 kbit/sB.42,4 kbit/sC.41,4 kbit/sBlocking supervision measurements take place everyA.100 secB.90 secC.60 secD.30 secE.25 sec

8、How many TRXs can the Ericsson BSC support?A.128B.256C.512D.1020E.10241毫瓦与1瓦约相差多少?A.20 dBB.30 dBC.1000 dBD.100 dBWhat is the name of the type of fading which is due to shadowing?A.MultipathB.Atmospheric fadingC.Rayleigh fadingD.Log-normal fadingE.Path lossWhat is the most common value of the hystere

9、sis used when estimating margins for log-normal fading?A.3dBB.5dBC.6dBD.8dB The purpose of ramping is to avoid handover decisions to a new neighbor based on only a few samples. What is a common parameter setting for macro cells?A.SSRAMPSI=10 and SSRAMPSD=20。B.SSRAMPSI=10 and SSRAMPSD=10。C.SSRAMPSI=5

10、 and SSRAMPSD=2。D.SSRAMPSI=2 and SSRAMPSD=5。从统计发现某小区掉话率偏高，仔细分析其掉话原因，发现弱信号掉话率占近100%，那么以下分析错误的是 答案应该是CA.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MAIO是为了减小频率干扰的，分为人工配置和缺省配置。哪一种复用形式建议采用人工配置的：A.1/3B.3/9C.1/1How many TSs and E1 are required for traffic on the Aatr interface when the traffic to be

11、 supported is 710 Erlang and GoS =1%A.738 TSs, 24 E1sB.185 TSs, 6 E1sC.683 TSs, 23 E1sWhich of the following Signaling System No. 7 Protocols are used for routing of signaling messages?A.MAP, TCAPB.TCAP, SCCPC.MTP, SCP1. Calculate the processor capacity in terms of calls/s when the traffic load is 7

12、2% and the load per call is 25ms.A.28,8 calls/sB.31,4 calls/sC.33,8 calls/sWhich of these different “dropped call rates” gives a “subscriber perceived” drop rate?A.Dropped TCH connections of the total number of TCH connectionsB.Dropped calls of the total number of calls terminated in the cellC.Erlan

13、g minutes per dropped TCH connectionD.Average call drops experienced during one hour talk timeE.All of theseWhat is added to the MS sensitivity level to obtain the required signal strength, SSreq?A.Rayleigh fading marginB.Rayleigh fading margin and interference marginC.Rayleigh fading margin, interf

14、erence margin, and body lossD.Rayleigh fading margin and body lossE.Interference margin and body lossUse the enclosed Erlang Table to work out which is the optimum SDCCH configuration using four TRXs, if the SDCCH/TCH traffic ratio is 30% and the required GoS on the TCH is 2%. （Assume no cell broadc

15、ast and no immediate assignment on the TCH.）A.SDCCH/8B.SDCCH/8 + SDCCH/4C.2*SDCCH/8D.2*SDCCH/8 + SDCCH/4E.3*SDCCH/8AGBLK must be set to a non-zero value （that is = 1 in Ericssons GSM system）, if:A.Cell broadcast is used in a cell with a non-combined configuration.B.Cell broadcast is used in a cell w

16、ith a combined configuration.C.System information, type 4, is sent on the BCCH.D.System information, type 5, is sent on the BCCH.E.MFRMS=2 or MFRMS=92. Which is the most important factor for determining the paging capacity in the BTS?A.MFRMS （controls the number of paging groups）B.AGBLK （reserves a

17、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!Are the UL signal strength measurements used in the locating algorithm?EA.Yes, of course.B.No, not at all.C.Yes, but it is used

18、 only to check if conditions for intra-cell and urgency 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 the conditions for intra-cell handover are fulfilled.What is the basic ranking in the Ericsson1 locating algorithm based on?A.R

19、elative signal strengthB.Absolute signal strengthC.Minimum signal strengthD.Sufficient signal strengthE.QualityWhat is the purpose of setting BSRXSUFF to 150 dBm and MSRXSUFF to 0 dBm in all cells?A.To make sure that the uplink signal strength influences the basic ranking.B.To enable path loss ranki

20、ng.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.Cells in the basic ranking list are divided into categories. How many categories are there, if the serving cell is considered as a category of its

21、 own?A.2B.3C.8D.10E.11What is one of the differences between the phase 1 and phase 2 establishment causes?PHASE1不能支持起呼的呼叫与SMS.其它类型的接入可区别A.Phase 2 establishment causes distinguish between answer to paging and call re-establishment.B.Phase 2 establishment causes distinguish between MS originated call

22、and answer to paging.C.Phase 2 establishment causes distinguish between location updating and answer to paging.D.Phase 2 establishment causes distinguish between MS originated calls and SMS.E.Phase 2 establishment causes distinguish between call re-establishment and SMS.Which of the criteria below i

23、s not influenced by the value of CHAP?（影响用户信道分配的功能是微分信道分配,用于做品牌接入）A.Prioritizing of different users or not.B.Immediate assignment on the TCH allowed or not.C.TCH or SDCCH first.D.Overlaid subcell as a last resort or not.E.Phase 1 or phase 2 mobiles3. If the path loss compensation parameter, LCOMPDL,

24、 is set to ten, the down regulation in the BTS output power, due to path loss compensation, is limited to:A.6 dBB.10 dBC.12 dBD.20 dBE.30 dB4. Assume that there are 12 frequencies （f1-f12） in the hopping frequency set. What default MAIO values are allocated to the first seven TRXs in the cell”?A.0,

25、1, 2, 3, 4, 5, and 6B.1, 2, 3, 4, 5, 6, and 7C.0, 2, 4, 6, 8, 10, and 1D.1, 3, 5, 7, 9, 11, and 0E.0, 3, 6, 9, 1, 4, and 7What is not taken into account when deriving SQI?A.BERB.FERC.HO eventsD.Speech coderE.Timing advanceWhich drop counter is stepped when a call is disconnected because MAXTA is exc

26、eeded?（TA掉话原因是与TALIM比较,大于MAXTA的掉话为不明原因掉话）A.SS drop counterB.Q drop counterC.TA drop counterD.All of theseE.None of these5. What expression is usually used for the paging success rate?（PAGING成功率为（第1次+第2次寻呼成功数）/第1次寻呼申请,因为第二次寻呼申请是重复第一次的）A.Successful repeated page attempts （in location area） of total nu

27、mber of first and repeated page attempts （in location area）.B.Successful repeated page attempts （in location area） of total number of 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 num

28、ber 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）.如果将T3101设置抬高,可能会造成什么影响?A.risk of SDCCH CongestionB.risk of PCH CongestionC.risk of TCH CongestionD.risk of AGCH Congesti

29、onCall Proceding是在以下哪个过程中被用到?A.MOCB.MTCC.Location UpdateD.handoverWhich of the following statements about the urban model is not true?A.Permanent screens, used in the half-screen part of the urban model,are used to define the environment along the calculation profile in a general way and, therefore, the lo