TALIM
368. 对于BA表的描述，下列哪个是错误的？ A
A.立即更新方法只用于空闲模式表而默认方法只用于激活模式。 B.空闲模式表可取较长而激活模式表尽量短。 C.激活模式表最好不要超出16个。 D.空闲模式表用于移动台的空闲模式而激活模式表及于移动台的激活模式。 369. 关于一层小区的描述，下列哪种说法是不正确的？ B
A.第一层小区不论在何种情况下都有最优先的等级。 B.当移动台发生差质时将会优先切往一层小区。 C.当移动台在一层小区通话时，如果周围没有相邻的一层小区，将会在一定区域内失去选优切换的功能。 D.一层小区只用于室内覆盖。 370. 对于动态功率控制，下列描述哪个是错误的？ D
A.参数SSDES用于上行动态功率控制而参数SSDESDL用于下行动态功率控制。 B.上行链路的动态功率控制是控制移动台的发射功率。 C.下行链路的动态功率控制是控制BTS的发射功率。 D.参数INTDES及INTLEN是上下行功态功率控制的初始状态控制参数。
371. Which of the following algorithms is made up of the three stages: Mcriterion,
K-criterion and L-Creterion? A
A.Ericsson-algorithm B.GSM-algorithm C.Ciphering-algorithm
372. Which of the following Signaling System No. 7 Protocols are used for routing of
signaling messages? B
A.MAP, TCAP B.TCAP, SCCP C.MTP, SCP
373. Calculate the processor capacity in terms of calls/s when the traffic load is 72% and the
load per call is 25ms. A.28,8 calls/s B.31,4 calls/s C.33,8 calls/s
374. Which of these different “dropped call rates” gives a “subscriber perceived” drop
rate? B
A.Dropped TCH connections of the total number of TCH connections B.Dropped calls of the total number of calls terminated in the cell C.Erlang minutes per dropped TCH connection D.Average call drops experienced during one hour talk time E.All of these 375. Which of Ericsson?s Network Improvement Performance Services includes optimization
activities? E
A.Transmission Network Review (TNR) B.Network Design and Performance Consulting (NDPC) C.Brief System Audit (BSA) D.System Performance Review (SPR) E.Radio Network Improvement (RNI)
376. What is added to the MS sensitivity level to obtain the required signal strength,
SSreq? C
A.Rayleigh fading margin B.Rayleigh fading margin and interference margin C.Rayleigh fading margin, interference margin, and body loss D.Rayleigh fading margin and body loss E.Interference margin and body loss
377. What is the most common value of the hysteresis used when estimating margins for
log-normal fading? A
A.3 dB B.5dB C.6dB D.8dB E.10dB
378. Use 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 broadcast and no immediate assignment on the TCH.) C A.SDCCH/8 B.SDCCH/8 + SDCCH/4 C.2*SDCCH/8 D.2*SDCCH/8 + SDCCH/4 E.3*SDCCH/8
379. AGBLK must be set to a non-zero value (that is = 1 in Ericsson?s GSM system),
if: A
A.Cell broadcast is used in a cell with a non-combined configuration. B.Cell broadcast is used in a cell with 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=9
380. Which is the most important factor for determining the paging capacity in the
BTS? D
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 mapping E.The use of cell broadcast 381. Are the UL signal strength measurements used in the locating algorithm? E
A.Yes, of course. B.No, not at all. C.Yes, but it is used 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.
382. What is the parameter TINIT used for? A
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.
383. What is the difference between BSTXPWR at the “preferred reference point” and the
reported signal strength in the mobile? C A.Path loss B.Path loss, minus antenna gain C.Path loss, minus antenna gain, plus feeder loss D.Path loss, minus antenna gain plus feeder and combiner losses E.There is no difference
384. What is the purpose of setting BSRXSUFF to –150 dBm and MSRXSUFF to 0 dBm in
all cells? D
A.To make sure that the uplink signal strength influences the basic ranking. 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.
385. When may the merry-go-round effect occur? C A.If TINIT has a low value B.If the hysteresis is too small C.If the offset is non-zero D.If PSSTEMP is set to a low value E.If PTIMTEMP is set to a low value 386. What is TRHYST used for? B A.It modifies the sufficient level condition for neighboring cells. B.It modifies the sufficient level condition for neighboring cells and the serving cell. C.It is used to move the L-L border. D.It is used to move the K-K border. E.It is used to move both the K-K and the L-L borders.
387. What is BQOFFSET used for? E
A.It is used to trigger a bad quality urgency condition. B.It is used as a signal strength offset to penalize cells after a bad quality urgency handover. C.It is used to offset the trigger conditions for a bad quality urgency handover. D.It is used to prevent a new handover attempt in a cell after handover failure. E.It is used to restrict the distance to a candidate cell, if a bad quality urgency condition is triggered.
388. 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 own? B A.2 B.3 C.8 D.10 E.11
389. The idle mobile derives an entity called C1. How is C1 used? A
A.C1 for a particular cell must be larger than zero for a mobile to be allowed to camp on that cell. B.C1 is a quality check and if not fulfilled, the idle mobile must try another cell to camp on. C.C1 and BSIC are reported to the serving cell, at least, once every five seconds to enable network controlled cell re-selection. D.At cell re-selection, the cell with the largest derived C1 is chosen to camp on. E.C1 is set to yes, if both CB and CBQ are low.
390. The idle mobile derives an entity called C2. How is C2 used? D
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 every five 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.
391. What is CRH used for? C A.It is used in combination with ACCMIN to cater for a layered cell structure in a dual
band network. B.It is used as a temporary offset to make a cell appear better during cell re-selection. C.It is used as a hysteresis between location area borders. D.It is used in a limited service state to enable emergency calls. E.It is the maximum number of repeated unsuccessful access attempts.
392. An idle mode mobile must read the BCCH data and decode BSIC for the neighboring
cells, at least, once during certain time intervals. What are the intervals? D
A.Five seconds (BSIC and BCCH data) B.Five seconds (BSIC) and 30 seconds (BCCH data) C.30 seconds (BSIC) and 30 seconds (BCCH data) D.30 seconds (BSIC) and five minutes (BCCH data) E.Five minutes (BSIC) and five minutes (BCCH data)
393. What is one of the differences between the phase 1 and phase 2 establishment
causes? D
A.Phase 2 establishment causes distinguish between answer to paging and call re-establishment. B.Phase 2 establishment causes distinguish between MS originated call 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.
394. Which of the criteria below is not influenced by the value of CHAP? A
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 mobiles.
395. If the path loss compensation parameter, LCOMPDL, is set to ten, the down regulation
in the BTS output power, due to path loss compensation, is limited to: A A.6 dB B.10 dB C.12 dB D.20 dB E.30 dB
396. Why can BTS power control be used to increase the capacity (that is, tightening the
frequency re.use in the network)? E
A.It increases the sensitivity of the mobile B.It increases the number of mobiles with high C/I. C.The power consumption in the radio base station is reduced. D.It reduces the risk of MS receiver saturation. E.It reduces the number of mobiles with low C/I. 397. What is the result from field measurements of coverage compared with: B
A.The design criterion B.The required signal strength C.The required signal strength, plus the log-normal fading margin D.The design criterion, minus the body loss E.The design criterion multiplied by a “probability of coverage” factor 398. What are event and level counters? A
A.It is the name of the software counters that are stepped in function blocks outside the STS (in RPs and CPs). B.It is the name of the counters of alternative A when they are stored/used in the STS later. C.It is the name of the counters of alternative B when they are stored/used in OSS later. D.Both A and B are correct. E.Both B and C are correct. 399. What is not taken into account when deriving SQI? E
A.BER B.FER C.HO events D.Speech coder E.Timing advance
400. What is the normal event that leads to an abnormal disconnection and stepping of the
drop counter? B
A.Failed decoding of speech frames B.Failed decoding of SAACH frames C.Excessive BER D.Poor signal strength E.Excessive timing advance
401. 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”? C
A.0, 1, 2, 3, 4, 5, and 6 B.1, 2, 3, 4, 5, 6, and 7 C.0, 2, 4, 6, 8, 10, and 1 D.1, 3, 5, 7, 9, 11, and 0 E.0, 3, 6, 9, 1, 4, and 7
402. If a call is dropped during excessive TA, bad quality and poor signal strength, which
cause counter will step? C
A.SS drop counter B.Q drop counter C.TA drop counter D.All of these E.None of these 403. Which drop counter is stepped when a call is disconnected because MAXTA is
exceeded? E
A.SS drop counter B.Q drop counter C.TA drop counter D.All of these E.None of these 404. What expression is usually used for the paging success rate? D
A.Successful repeated page attempts (in location area) of total number 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 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). 405. What is ICDM? B
A.Intra-Cell Downlink Measurements B.Inter Cell Dependency Matrix C.Interference Combined with Downlink Measurements D.Internal Cell Disturbance Measurements E.Interfered Cell Disturbance Matrix
二、多选题
1. 下面哪个不是GSM无线接口网络层的功能子层 DE
A.MM B.CM C.RR D.RLC E.CC
2. 以下那些在”Channel Required” 消息中传送? ACD
A.Establish Cause B.LAC& CI C. Random Reference C.TA D.IMSI or TMSI 3. location updating在哪些情况下发生： AB
A.a) 当打开手机时 B.b) 当从一个BSC进入到另一个BSC时 C.c) 当从一个小区进入到另一个同LAC的小区时
4. 小区负荷分担，要满足 BCD 时，才可以向对方切换 。
A.排队在服务小区之后 B.同一个BSC C.同一LEVEL层 D.对方的HOCLSACC=ON
5. 哪些功能可以直接或间接改善网络话音质量 ABCD
A.开启动态功率控制 B.开启跳频 C.开启IHO D.开启EFR
6. 小区四个载波配置CDU－C＋，采用空间分集接收，在安装天线时，如果将两支天
线方向调得不一样，结果可能会产生以下哪些情况 ： ABC
A.接通率降低 B.掉话率增高 C.切入成功率降低 D.随机接入失败率增大 7. 以下哪些描述是的? BD
A.在同步的Intercell 切换中不需要Physical Context Request 过程. B.呼叫可以通过Normal Assignment 过程从TCH 被分配到SDCCH. C.在Normal Assignment 中, 如果Physical Context Request 过程不成功呼叫就无法进行下去. D.同步切换比异步快.
8. 在线测试中经常会碰到手机记忆效应，对此以下说法正确的是 ACE
A.记忆效应通常是由于小区BCCH频点安排不当引起的 B.记忆效应通常是由于小区BSIC安排不当引起的 C.记忆效应与手机解读六强邻区的BSIC速度有关 D.记忆效应不影响小区切换 E.通过调整小区天线方向角或下倾角改善记忆效应 9. 关于SQI的说法正确的是： BCF
A.频繁切换不影响SQI值 B.频繁切换影响SQI值 C.SQI是对无线链路的语音质量评估 D.SQI是对无线链路和有线链路的语音质量评估 E.误码率的时间分布对SQI影响不大 F.误码率的时间分布对SQI影响很大 10. 采用DTX的作用是 ACD
A.降低电池消耗。 B.减少基站处理器负荷。 C.提高话音质量。 D.减少互调干扰。 11. 下列哪些方法可以增加小区的覆盖区域. AC A.提高天线的高度 B.加大天线的下倾 C.增加基站的发射功率