网络规划优化题目Test Questions on Network Planning and Optimization

网络规划优化题目

Test Questions on Network Planning

and Optimization

I 选择题

Single or Multiple Choices

1.小区的话务量一般按忙时话务量来设计。设一个小区有6个业务信道，平均每信道服务

18个用户，一次呼叫的平均通话时间为2分钟，则该小区忙时话务量为：

The cell traffic is usually designed according to the busy hour traffic. Suppose a cell has 6 traffic channels, each channel serves 18 subscribers, and the average conversation duration of one call is 2 minutes. The busy hour traffic of this cell is:

A 4Erlang

B 3.6 Erlang;

C 6 Erlang

D 5.4 Erlang

答案：B

Answer: B

2.一般认为，设计蜂窝系统时，使用Erlang B呼损公式，为了便于工程计算，制成了Erlang

B表。Erlang B表直接给出了下列哪个选项的相互关系：

Generally, the Erlang B call loss formula can be used in design of a cellular system. An Erlang B table is created for ease of engineering calculation. The Erlang B table shows the relationship between .

A 载频数、话音信道数和可提供的话务量；

Number of carrier frequencies, number of voice channels and available traffic

B 人均话务量、话音信道数和可提供的话务量；

(B) Traffic per person, number of voice channels and available traffic

C 呼损率、话音信道数和可提供的话务量；

Call loss rate, number of voice channels and available traffic

D 呼损率、载频数和可提供的话务量；

Call loss rate, number of carrier frequencies and available traffic

答案：C

Answer: C

3.以下哪些信道只有下行信道:

Which of the following channels has only downlink channel?

A PCH

B RACH

C SACCH

D SDCCH

答案：A

Answer: A

4.手机在通话状态下，BSS系统会在空中接口发送以下哪些系统消息：

Which of the following system messages will be sent by the BSS system through an air interface when the mobile station is in conversation status?

A 系统消息类型1、2

System message types 1 and 2

B 系统消息类型3、4

System message types 3 and 4

C 系统消息类型5、6

System message types 5 and 6

D 系统消息类型7、8

System message types 7 and 8

答案：C

Answer: C

5.―Call Confirmed‖是在_过程中被用到？

―Call Confirmed‖ is used in the _ process.

A MOC

B MTC

C Location Update

D Handover

答案：B

Answer: B

6.参数INTFBD1…INTFBD5 把基站在空闲信道上收到的上行干扰情况分为5个等级, 其

中反映干扰最严重的是

The INTFBD1…INTFBD5 parameter classifies the uplink interferences that the base station receives on the idle channel into 5 classes, among which indicates the most serious interference.

A Interference Band 1

B Interference Band 2

C Interference Band 4

D Interference Band 5

答案：D

Answer: D

7.―HO Access‖消息是在哪个信道上传送的

The ―HO Access‖ message is transmitted on .

A RACH

B AGCH

C SDCCH

D FACCH

答案：D

Answer: D

8.一般认为，GSM系统小区的最大覆盖半径；

Generally, the maximum coverage radius of a cell in the GSM system is.

A 15km

B 50km

C 25km

D 35km

答案：D

Answer: D

9.GSM手机最大发射功率一般是2W，如果算成dbm是多少:_ __dbm

The maximum transmitter power of GSM mobile phone is typically 2W, which is equal to:_ __dbm.

A 10

B 20

C 30

D 33

答案:D

Answer: D

10.为避免因过多跨越LAC的小区重选而造成的SDCCH阻塞，我们可以将与该小区有邻

区关系且与之LAC不同的相邻小区的____参数提高。

In order to prevent SDCCH congestion due to many cross-LAC cell selections, the ____ parameter can be increased for the cells that are adjacent to this cell and have a different LAC from this cell.

A T3212

B Cell_Reselect_hysteresis

C Cell_Reselect_Offset

D Rexlev_Access_Min

答案：B

Answer: B

11.GSM系统使用的多址方式为______。

The GSM system uses the ______ multiple access mode.

A FDMA

B TDMA

C CDMA

D FDMA+TDMA

答案：D

Answer: D

12.采用频率复用技术是有效提高频率利用率的手段。假设可用的频率资源为10M，分别

使用7*3与4*3频率复用方式，则前者与后者相比，频率利用率要：

The frequency reuse technology can effectively increase the frequency utilization. Suppose

the available frequency resource is 10M, and 7*3 and 4*3 frequency reuse modes are used respectively, then the frequency utilization of the former is that of the latter.

A 高Higher than

B 低Lower than

C 相等Equal to

D 无法比较

Not comparable with

答案：B

Answer: B

13.无线信号在水面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______。

The radio signal has a _____ loss over the water surface than in the air. The radio signal with

a higher frequency is propagated in the air with a ______ loss.

A 大、大

Larger, larger

B 小、小

Smaller, smaller

C 大、小

Larger, smaller

D 小、大

Smaller, larger

答案：D

Answer: D

14.天线增益是如何获得的?

How the antenna gain is obtained?

A 在天线系统中使用功率放大器

Use a power amplifier in the antenna system

B 使天线的辐射变得更集中

Focus the radiation of antenna

C 使用高效率的天馈线

Use an efficient antenna feeder

D 使用低驻波比的设备

Use a device with a low standing wave ratio

答案：B

Answer: B

15.GSM系统在城市的主要传播方式为：

The main propagation mode of the GSM system in the urban areas is:

A 直射波传播；

Collineation wave propagation

B 绕射波传播；

Diffraction wave propagation

C 多径传播；

Multipath propagation

D 表面波传播；；

Surface wave propagation

答案：C

Answer: C

16.在同等条件下，即从基站天线到同一点接收点，假设接收点离基站距离5km，则900MHz

与1800MHz相比，其传播损耗要：

Suppose the receiving point is 5km away from the base station, then the propagation loss of 900MHz is that of 1800MHz under the same conditions (from the antenna of base station to the same receiving point).

A 大Larger than

B 低Lower than

C 相等Equal to

D 无法比较

Not comparable with

答案：B

Answer: B

17.GSM系统中，传播损耗与距离的关系服从：

In the GSM system, the propagation loss and distance have relationship.

A 对数关系；

Logarithmic relationship

B 指数关系；

Exponential relationship

C 线性关系；

Linear relationship

D 对数线性关系；；

Logarithmic and linear relationship

答案：D

Answer: D

18.传播模型的选择与覆盖区域的半径有关，一般认为，当覆盖半径大于时，统计型模

型的预测精度比较理想。

Selection of propagation model is related to the coverage radius. Generally, the statistics model has a more desirable prediction accuracy when the coverage radius is larger than .

A 100m

B 500m

C 1km

D 35km

答案:B

Answer: B

19.手机开机时进行小区选择的准则是:

The criterion for cell selection is when the mobile phone is switched on.

A 接收电平

Receive level

B 接收质量

Reception quality

C C1值

C1 value

D 干扰指标

Interference index

答案:C

Answer: C

20.手机在空闲状态下进行小区重选的准则是:

The criterion for cell reselection is when the mobile phone is in idle status.

A 接收电平

Receive level

B C2值

C2 value

C 接收质量

Reception quality

D 干扰指标

Interference index

答案:C

Answer: C

21.―1*3‖复用，射频跳频，50%负荷能带来以下增益：

―1*3‖ reuse, radio frequency hopping and 50% load will result in the following gain:

A 频率分集增益和干扰分集增益

Gain of both frequency diversity and interference diversity

B 只有频率分集增益

Gain of frequency diversity only

C 只有干扰分集增益

Gain of interference diversity only

D 既没有频率分集增益，也没有干扰分集增益

Neither gain of frequency diversity nor interference diversity gain

答案:B

Answer: B

22.采用水平空间分集接收时，为保证得到较好分集增益效果，两个接收天线间距最好保

持。

If the horizontal space diversity is used for receiving, two receiver antennas should be kept away from each other in order to achieve better diversity gain effect.

A 0.2米0.2m

B 1米1m

C 2米2m

D 4到6米。

4~6m

答案：D

Answer: D

23.具有相同BCCH载波频率的不同基站可以通过来区分

Different base stations with the same BCCH carrier frequency can be distinguished by.

A C1参数

C1 parameter

B C2参数

C2 parameter

C 电平值Rxlev

Level value Rxlev

D 基站识别码BSIC

Base Station Identity Code (BSIC)

答案：D

Answer: D

24.下面几种频率规划方法中必须采用射频跳频的是。

Which of the following frequency planning methods must use the radio frequency hopping?

A. 4*3

B. 7*3

C. 1*3

D. MRP

答案：C

Answer: C

25.对于引起HO的原因，下面描述是错误的。

Which of the following descriptions is wrong about the cause for HO?

A Better cell HO

B Emergency HO

C Low battery HO

C Power budget HO

答案：C

Answer: C

26.呼叫请求排队条件为____。

The condition for call request queuing is ____.

A 无SDCCH，无TCH

SDCCH not available, TCH not available

B 无SDCCH，有TCH

SDCCH not available, TCH available

C 有SDCCH，无TCH

SDCCH available, TCH not available

D 有SDCCH，有TCH

SDCCH available, TCH available

答案：C

Answer: C

27.一个基站位于农村，原来下行(DownLink)覆盖半径为15公里，现欲扩大该小区的下行

覆盖半径，使之为25km，则下列手段可以考虑：（多选）

There is a base station in the country, whose downlink coverage radius is 15km. Now the downlink coverage radius of this cell is to be increased to 25km, then which of the following measures can be used? (Multiple choices)

A 增大BTS发射功率；

Increase the transmitter power of BTS

B BTS使用塔放；

Use a tower amplifier for BTS

C 该小区使用更多的载频；

Use more carrier frequencies for this cell

D 提高天线高度；

Increase the height of the antenna

E 使用低增益天线；

Use an antenna with a low gain

答案：A D

Answer: A, D

28.上下行链路平衡是网络规划的要点之一。设目前有一个小区，其下行覆盖半径为8km，

上行覆盖半径为5km；为了使上下行链路平衡，可以采取的手段有：(多选)

Uplink/downlink balancing is a key point in the network planning. Suppose there is a cell with the downlink coverage radius 8km and the uplink coverage radius 5km. Which of the following measures can be used in order to keep the uplink and downlink balanced?

(Multiple choices)

A 增大BTS发射功率；

Increase the transmitter power of BTS

B 减小BTS发射功率；

Decrease the transmitter power of BTS

C BTS使用塔放；

Use a tower amplifier for BTS

D 使用低增益天线；

Use an antenna with a low gain

答案：BC

Answer: B, C

29.下列几种情况中，作为降低干扰的一般手段，有：

Which of the following measures can be used to reduce interference? （多选）

(Multiple choices)

A 改善频率配置；

Improve frequency configuration

B 使用定向天线及定向天线下倾；

Use a directional antenna and tilt the directional antenna

C 降低天线高度；

Decrease the height of the antenna

D 增大BTS发射功率；

Increase the transmitter power of BTS

答案：ABC

Answer: A, B, C

30.以下____不可执行DTX操作。（多选）

The DTX operation cannot be performed to ____. (Multiple choices)

A SDCCH

B SACCH

C BCCH

D TCH

答案AC

Answer: A, C

II 填空题

Fill in the Following Blanks.

1.UM口给手机分配SDCCH信道的层3信令是：immediate assignment ,给手机分配TCH

信道的层3信令是：Assignment command.

The UM interface uses the Layer 3 signaling immediate assignment to assign the mobile phone with SDCCH, and uses the Layer 3 signaling Assignment command to assign the mobile phone with TCH.

2.通常说的拥塞是指：SDCCH信道和TCH信道的拥塞，中国移动定义的无线接通率的

算法是(1-SDCCH拥塞率)×（1－TCH拥塞率）。

Generally, congestion means the congestion of SDCCH and TCH. The algorithm of wireless call completion ratio defined by China Mobile is (1-SDCCH congestion rate) X (1-TCH congestion rate).

3.中国移动定义的话务掉话比的算法是：话务量*60/TCH掉话次数

The algorithm of traffic dropped call rate defined by China Mobile is traffic * 60/number of TCH dropped calls.

4.平常我们说得GSM上行干扰实际上是指GSM上行频段受到的干扰。

Generally, GSM uplink interference actually refers to the interference to the GSM uplink frequency band.

5.开启射频调频的小区BCCH载频的TCH时隙是否可以调频：不可以，开启基带调频

的小区BCCH载频的TCH时隙是否可以调频：可以

Can the TCH timeslot of the BCCH carrier frequency with the radio frequency modulation enabled be modulated? No. Can the TCH timeslot of the BCCH carrier frequency with the baseband modulation enabled be modulated? Yes.

6.如果CCCH-CONF配置为‖0‖,则一个BCCH复帧的CCCH消息块数为9 ，如果其

中每个BCCH复帧中保留给AGCH信道的块数为2 块，则每个BCCH复帧中留给PCH 信道的块数7 。

If CCCH-CONF is configured to ―0‖, one BCCH multiframe has 9 CCCH message blocks.

If two of these blocks in each BCCH multiframe are reserved for AGCH, then 7 blocks in each BCCH are reserved for PCH.

7.引起定向重试的主要原因是：本小区TCH信道拥塞

The major cause for directed retry is that TCH of this cell is congested.

8.切换的Margin主要包括：PBGT切换Margin，质量切换Margin和电平切换Margin.

The handover Margins include PBGT handover Margin, quality handover Margin and level handover Margin.

9.OMC_R是Operation and Maintenance Center —Radio的全称。

The full name of OMC_R is Operation and Maintenance Center – Radio.

10.GSM系统规定的（在无跳频情况下），同频干扰保护比C/I≥9dB，邻频干扰保护比C/I ≥

－9dB

The GSM system specifies that (in case of no frequency hopping), the co-frequency interference protection ratio C/I≥9dB, and the adjacent frequency interference protection ratio C/I ≥－9dB.

11.GSM系统规定的载频间隔为200kHz

The specified carrier frequency interval for the GSM system is 200 kHz.

12.GSM空中接口的一个时隙的长度__0.577ms，每个时隙的间隔包含156.25bit,GSM的调

制方式是GMSK，调制速率270.833k bit/s。

One timeslot of the GSM air interface is 0.577ms long. The interval of each timeslot contains 156.25 bits. GSM uses the modulation mode GMSK with the rate 270.833k bit/s.

13.天线有较多的电气性能参数，主要包括半功率角、前后比和增益。

An antenna has many electrical performance parameters, including half-power angle, front-back ratio and gain.

14.小区的信号覆盖不太理想，可以通过调整天线的物理参数方向角和俯仰角等来尝试改变

覆盖范围

If the cell has a poor signal coverage, the coverage can be changed by adjusting the physical parameters direction angle and tilt angle of the antenna.

15.根据CMCC城市路测规范，测试指标主要包括：接通率、掉话率、覆盖率、话音质量

等。

According to the drive test specification for CMCC urban area, the test indexes mainly include call completion ratio, dropped call rate, coverage, voice quality, etc.

16.信号在无线路径上的衰落有多种，请写出至少三种：快衰落、长期衰落和多径衰落。

Please list at least three types of fading of signals on the radio path: fast fading, long-term fading and multipath fading.

17.列出导致小区切换的五种具体原因：PBGT切换、救援性电平切换、救援性质量切换、

话务引起的切换和距离切换

Please list five causes for cell handover: PBGT handover,rescue level handover, rescue quality handover, traffic-caused handover and distance handover.

18.无线信道在自由空间的衰落情况是：传播距离每增大一倍，信号强度减小__6__db。

The radio channel is faded in the free space as follows: The signal strength decreases by 6_db when the propagation distance is doubled.

19.GSM系统，手机在通话TCH状态中每_480 ms向网络提供一次测量报告，其中包含

__4__个TCH复频。

In the GSM system, the mobile phone in the conversation TCH status will submit a measurement report to the network every 480 ms, which includes 4 TCH multiframes.

20.GSM系统中时间提前量（TA）的一个对应空间传播的距离接近_550_米

The Timing Advance (TA) in the GSM system corresponds to nearly 550m space propagation distance.

21.GSM系统中，话音质量总共分为_8_等级

In the GSM systems, the voice quality is divided into 8 grades.

22.GSM系统中的跳频分为基带跳频和射频跳频两种。

The frequency hopping in GSM can be classified into baseband frequency hopping and radio frequency hopping.

23.逻辑信道又分为两大类业务信道和控制信道。

Logical channels can be divided into Traffic Channel and Control Channel.

24.分集的方法有空间分集、频率分集、极化分集、角度分集、时间分集和分量分集等多种。

（至少写出4种）

The diversity methods include space diversity, frequency diversity, polarization diversity, angle diversity, time diversity and component diversity. (List at least 4 methods.)

25.蜂窝移动通信系统主要是由交换网路子系统（NSS），无线基站子系统和(BSS)和移

动台（MS）三大部分组成。

The cellular mobile communication system consists of switching network subsystem (NSS), wireless base station subsystem, and (BSS) and Mobile Station (MS).

26.NSS与BSS之间的接口为―A‖接口，BSS与MS之间的接口为―Um‖接口。

The interface between NSS and BSS is the ―A‖ interface, and the interface between BSS and MS is the ―Um‖ interface.

27.在GSM中每一频点（频道或叫载频TRX）上可分成8个时隙，每一时隙为一个信道，

因此，一个TRX最多可有8个移动客户同时使用。

In GSM, each frequency (channel or carrier frequency TRX) can be divided into 8 timeslots.

Each timeslot is a channel. Therefore, one TRX can be used by up to 8 mobile subscribers at the same time.

28.PBGT切换的全称是：power budget evaluation（功率预算切换）

The full name of PBGT handover is power budget evaluation handover.

29.BSIC 是移动网络中的一个重要参数,它是由NCC和BCC组成，组合的最大8进制数是

77

BSIC, a significant parameter in the mobile network, is composed of NCC and BCC. The maximum octave number of combination is 77.

30.位置更新可分为两种：周期性位置更新和跨Lac的位置更新。

There are two types of location update: periodic location update and cross-LAC location update.

III 简答题 Questions

1. 请用树结构简单描述GSM 系统的基本信道分类

Please describe the basic channel types of the GSM system in a tree structure.

信道

物理信道（时隙TS ）

逻辑信道

业务信道（TCH ）

全速率半速率

广播信道(BCH )

控制信道（CCH ）

通用控制（CCCH ）

专用控制（DCCH ）

广播控制BCCH

同步SCH 频率纠正FCCH

寻呼PCH 随机接入RACH 接入允许AGCH

独立专用SDCCH 小区广播CBCH 快速随路FACCH 慢速随路SACCH

Channel

Physical Channel (timeslot)

Logical Channel

Traffic channel (TCH)

Full Rate Half Rate

Broadcast channel

(BCH)

Control channel (CCH)

Common Control

(CCCH)Dedicated Control (DCCH)

Broadcast Control BCCH Synchronous SCH

Frequency Correction FCCH

Paging PCH Random Access RACH Access Grant AGCH

Stand-alone Dedicated SDCCH Cell Broadcast CBCH Fast Associated FACCH Slow Associated SACCH

2. 频率复用的定义，常用的几种频率复用方式？

Describe the definition of frequency reuse and list the several common frequency reuse modes.

答：频率复用就是指在数字蜂窝系统中重复使用相同的频率，一般把有限的频率分成若干组，依次形成一簇频率分配给相邻小区使用。频率规划的基础工作就是频率复用。常用的频率复用方式有7*3、4*3、3*3、1*3。

Answer: Frequency reuse means the same frequency is reused in the digital

cellular system. Generally, limited frequencies are divided into several groups to form a cluster of frequencies that can be allocated to the adjacent cells for use.

Frequency reuse is the basic job of frequency planning. The common frequency reuse modes include 7*3, 4*3, 3*3 and 1*3.

3.请简述GSM系统的基本信道分类

Please describe the basic channel types of the GSM system.

答：GSM系统中，信道分成物理信道和逻辑信道，时隙是基本的物理信道，即一个载频包含8个物理信道。无线子系统的物理信道支撑着逻辑信道。逻辑信道按其功能分为业务信道（TCH）和控制信道（CCH）。其中控制信道用于携载信令或同步数据，包括三类控制信道：广播信道、公共控制信道和专用控制信道。

Answer: In the GSM system, channels can be divided into physical channel and logical channel. Timeslot is a basic physical channel, namely one carrier frequency contains eight physical channels. The physical channel of the radio subsystem bears the logical channel.

Logical channels can be divided into Traffic Channel (TCH) and Control Channel (CCH) by function. The control channel is used to carry the signaling or synchronize data. There are three types of control channel: broadcast channel, common control channel and dedicated control channel.

4.请简述GSM系统跳频的意义

Please describe the meaning of frequency hopping in the GSM system.

答：在蜂窝移动通信系统中应用，可以提高系统抗多径衰落的能力，并且能抑制同频干扰对通信质量的影响，跳频主要带来的好处是所谓频率分集(Frequency Diversity)和干扰分集(Interference Diversity)的效果。频率分集实际上是提高了网络的覆盖范围，干扰分集则提高了网络的容量。

Answer: This function can be used in the cellular mobile communication system to improve the ability of the system to prevent multipath fading and reduce the influence of co-frequency interference on the communication quality. The benefits of frequency hopping are the effects of frequency diversity and interference diversity. The frequency diversity extends the network coverage, while the interference diversity increases the network capacity.

5.A接口、Abis接口和Um接口分别是哪些接口？

What are the A interface, Abis interface and Um interface?

A接口时BSS与MSC之间的接口；Abis接口是BSS系统的两个功能实体BSC与BTS 之间的接口；Um接口是MS与BTS之间的空中无线接口；

A interface is an interface between BSS and MSC. Abis interface is an interface between the

two functional entities BSC and BTS in the BSS system. Um interface is an air interface between MS and BTS.

6.列出GSM网络存在地常见干扰类型？

List the common interference types in the GSM network.

同频干扰、邻频干扰、互调干扰、带外干扰和阻塞干扰等

Co-frequency interference, adjacent interference, inter-modulation interference, out-of-band interface and blocking interference.

7.0dB的含义是什么？BER、FER和C/I 均可用于表征无线信号质量的好坏，其中文名

称分别是什么？

What is the meaning of 0dB? What are the full names of BER, FER and C/I that can be used to indicate the quality of radio signals?

0dB的含义是无增益。BER：误码率

0dB means no gain. BER: Bit Error Rate FER：帧擦除（丢失）率

FER: Frame Erase (Error) Rate C/I：载干比

C/I: Carrier/Interference Ratio

8.以下为某型号的基站典型无线链路参数值：

Presented below are the typical radio link parameter values of a base station of a model:

上行：手机发射功率33dBm，手机天线增益2dB，人体损耗3dB，基站天线增益15dBi，分集接收增益 5 dB，基站馈线损耗3dB，基站灵敏度-110dBm。

Uplink: MS transmitter power 33dBm, MS antenna gain 2dB, human body loss 3dB, base station antenna gain 15dBi, diversity reception gain 5 dB, base station feeder loss 3dB, and base station sensitivity -110dBm.

下行：基站发射功率43dBm, H2D合路-双工器损耗4.5 dB,馈线损耗3dB, 基站天线增益15dBi, 手机灵敏度-102dBm，人体损耗3dB，手机天线增益-2dB

Downlink: Base station transmitter power 43dBm, H2D combiner-duplexer loss 4.5 dB, feeder loss 3dB, base station antenna gain 15dBi, MS sensitivity -102dBm, human body loss 3dB, and MS antenna gain -2dB.

答案：Answer:

上行最大允许无线传播损耗分别是：155dB

The maximum allowed wireless propagation losses of the uplink are respectively 155dB

((33+2-3)- (-110+3-5-15)=32+127)=159

下行最大允许无线传播损耗分别是：151.5dB

The maximum allowed wireless propagation losses of the downlink are respectively 151.5dB (43-4.5-3+15)-(-102+3-2)=50.5+101=151.5

无线链路上行受限

The uplink of radio link is limited.

实际最大允许无线传播损耗是：151.5dB

The actual maximum allowed wireless propagation loss is 151.5dB.

I 填空题

Fill in the Following Blanks.

1.35o13143″=______o(用**.#####度的形式表示，注意保留小数点后5位)；（35.2279444）

35o13143″=______o(in the form of **.##### degree, where five digits are reserved after the decimal point). (35.2279444)

2.2、网络优化最常用的方法是、。（拨打测试（CQT）、

路侧（DT））

The most commonly used methods for network optimization are

and . (Call Quality Test (CQT), Drive Test (DT))

3.移动通信工程设计包括、和。（交换网设计、无线网

设计、中继线路设计）

Designs of mobile communication engineering covers ,

and .（design of switching network, design of radio network, design of trunk)

4.跳频通过频率分集来减小的影响。（多经衰落）

Frequency hopping reduces influence of through frequency diversity. (multipath fading)

5.移动通信中，进行覆盖预测时，最通常使用的传播模型是、模

型。（通用、奥村）

In mobile communication, the most commonly used propagation model for coverage prediction are and models. (universal, Okumura)(中级)

6.塔顶放大器在移动通信中是一项非常适用的技术，人们主要是用塔放来解决的

问题。（移动通信基站台商、下行不平衡）

Tower amplifier is a technology very suitable for mobile communication. The tower amplifier is used to solve the problems of . (unbalanced uplink and downlink of mobile communication base station)

7.引入不连续发射（DTX）的优点是和。（降低干扰、节省移

动台电池）

Discontinuous Transmission (DTX) is introduced to and .

(reduce interference, save battery energy for mobile station)

8.GSM中的调频可分为和两种。是通过腔体合

成器来实现的。在GSM中就采用此种技术。（基带调频、射频调频）

Frequency modulation in GSM includes and .

is realized through a cell synthesizer. This technology is used in GSM. (baseband frequency modulation, radio frequency modulation)

9.在移动通信中为了避免经常出现的成串的比特差错问题，引入了。（交

织技术）

is introduced in the mobile communication in order to avoid a sequence of bit errors that occur frequently. (Interleaving technology)

10.在通信过程中，系统对切换和功率控制的判决取决于移动台定期向网络发送

的。（对下行链路测量的报告）

In the mobile communication, the system determines handover and power control depending on the that the mobile station sends to the network regularly. (downlink measurement report)

11.天线的性能参数包括、、。（增益、极化方式、

波束宽度）

The performance parameters of antenna includes ,

and . (gain, polarization mode, beam width)

12.城区要求覆盖距离较近，一般选用增益天线，郊区要求覆盖距离较远，选

用增益的天线。（15.5dbi、17dbi）

Typically the gain antenna is used in urban areas where small coverage is required, while is used in suburbs where large coverage is required. (15.5dbi, 17dbi)

13.同样的单元通常有多个功能实体，在不同的功能实体之间的逻辑链路通过功能地址来识

别。（Service Access Points Identifier （SAPI））

A single unit usually consists of multiple functional entities. The logical links between

different functional entities are identified by the function address . (Service Access Points Identifier (SAPI))

14.Erlang B表定义了的关系。（呼损、

信道数及话务量）

The Erlang B table defines the relationship

between . (call loss, number of

channels and traffic)

15.L3包括三个基本子层包括。（无线资源管理

RR、移动性管理MM、接续管理CM）

L3 consists of three basic sub-layers: . (Radio Resource management (RR), Mobility Management (MM), Connection Management (CM))

16.交换子系统各接口采用协议，它采用交换协议数据与会话的方式，主要传递

与移动台漫游相关的信息。（MAP）

Various interfaces of the switching subsystem use the protocol, which transfers information about roaming of mobile station using the switching protocol data and sessions.

(MAP)

17.MS上报的测量报告包括。（DL

信号强度、DL信号质量、邻小区信号强度）

The measurement report submitted by MS

contains . (DL signal strength, DL signal quality, and signal strength of an adjacent cell)

18.传播模型的选择与覆盖区域的半径有关，一般认为，当覆盖半径大于___ __时，统计

型模型的预测精度比较理想。（1公里）

Selection of propagation model is related to the radius of coverage. Generally, the statistics model has a desirable prediction accuracy when the radius of coverage is larger than ___

__. (1 km)(中级)

19.提高网络容量方法很多，常用的

是、、、。（蜂窝小区分裂、采用紧密的频率复用方式、同心圆、扩展频段）

The network capacity can be increased in such ways as , ,

and . (Cell splitting, close frequency reuse mode, concentric circle, extended frequency band)

20.GPRS系统相对于GSM系统组成，增加了、

两种功能单元。（SGSN、GGSN）

The GPRS system has two functional units added compared with the GSM system, which are and . (SGSN, GGSN)

1.在GSM中，控制信道用于携带信令或同步数据，可分为，和。[广

播信道，公共控制信道，专用控制信道]

In GSM, the control channel is used to carry signaling or synchronize data. It can be classified into , and . [broadcast channel, common control channel, dedicated control channel]

2.SACCH是一伴随着TCH和SDCCH的专用信令信道。在上行链路上它主要传递

和第一层报头消息（包括和）；在下行链路上它主要传递系统消息type5，5bis，5ter，6及第一层报头消息。[无线测量报告，TA值，功率控制级别]

SACCH is a dedicated signaling channel that accompany the TCH and SDCCH. It transfers

and Layer 1 header message (including and ) on the uplink. And it transfers the system messages type5, 5bis, 5ter, 6 and Layer 1 header message on the downlink. [radio measurement report, TA value, power control level]

3.传播模型分为统计型模型和决定型模型。其中常见的统计型模型

有，；常见的决定型模型有。

[Okumura-Hata模型，COST-231模型，COST-231-Walfish-Ikegami模型]

The propagation models are classified into statistics model and decision model. The common statistics models are and ; and the common decision models are . [Okumura-Hata model, COST-231 model, COST-231-Walfish-Ikegami model]

4.在GSM中采用交织技术来实现分集；通过跳频技术来实现分集。[时

间，频率]

In GSM, the diversity is implemented by using the interleaving technology, and the diversity is implemented by using the frequency hopping technology. [time, frequency]

5.全速率TCH信道编码是每20ms内形成bit的编码序列，经过交织后在个1/2

普通突发脉冲上发送；[456，8]

Full-rate TCH channel code is the bit code sequence formed every 20ms, which is interleaved and sent on the 1/2 normal burst. [456，8]

6.天线的增益是指天线在其最大辐射方向上的增益，它的单位是dBi或者dBd。其中dBi

用于天线增益相对于的参考值，而dBd是用于天线增益相对于的参考值，两者相差dB。[全向辐射器，半波振子，2.15]

The antenna gain refers to the gain of antenna in the direction of maximum radiation, in dBi or dBd. DBi is used for the reference value of antenna gain relative to , while dBd is used for reference value of antenna gain relative to . Their difference is

dB. [omni-directional radiator, half-wave dipole, 2.15]

7.定时器T3212的单位是min，当该值设为0时则表示。[6，该

小区无需位置更新]

The timer T3212 is in the unit of min. When this value is set to 0, it indicates that . [6, this cell does not need location update]

8.定时器T3122的设置原则是在网络的信道不发生过载的情况下，应使

T3122尽可能，通常建议在业务量密集区设置为s。[CCCH,小，15~25]

The principle to set the timer T3122 is that T3122 should be as as possible while of the network is not overloaded. It is recommended to set the value to s for the area with high traffic. [CCCH, small, 15~25]

9.惩罚时间PT由bit组成。如果不希望快速MS接入微蜂窝小区，则微蜂窝越大，

惩罚时间越。[5，大]

The Penalty Time (PT) consists of bits. If the rapid MS is not expected to access the micro cell, then a larger micro cell will have a longer penalty time. [5, longer]

10.DTX的应用有两个优越性，分别为和。[降低无线

信道的干扰，降低移动台的功率损耗]

DTX has two advantages: and . [reduce the interference of radio channel, reduce the power consumption of mobile station]

11.无论是否采用DTX，测量报告都有两个值，一个是测量，一个是测量。

[全局，局部]

The measurement report has two values regardless the use of DTX. One is the

measurement, and the other is the measurement. [global, local]

12.根据定时提前来分，切换可分为切换和切换。[同步，异步]

The handovers can be classified into handover and handover by the timing advance. [synchronous, asynchronous]

13.当移动台收到网络发出的―HANDOVER COMMAND‖后，将根据四种方式来接入目标

小区，这四种方式是，，

和。[完全同步小区，非同步小区，预同步小区，伪同步小区]

Upon receiving ―HANDOVER COMMAND‖ from the network, the mobile station will access the target cell in four modes, which are , ,

and . [fully synchronized cell, non-synchronized cell, pre-synchronized cell, pseudo-synchronized cell]

9a65efe39b89680202d82505PD和MTP2都采用的是的定义方式，而LAPDm是利用无线接口的同

步方式来传送以帧方式定义的信息。[HDLC（高级数据链路控制）]

Both LAPD and MTP2 employ the definition mode of , while LAPDm uses the radio interface synchronization mode to transmit the information defined using frames.

[HDLC (High-level Data Link Control)]

9a65efe39b89680202d82505PDm的帧长度等于23byte，但一个LAPDm帧在SACCH上最多为21byte，这是因

为SACCH块还有两个特殊用途的字节，分别是和。[定时提前，传输功率控制]

The frame of LAPDm is 23 bytes long. However, one LAPDm frame includes21 bytes at most on SACCH, because the SACCH block has two special-purpose bytes, which are

and . [timing advance, transmission power control](中级)

16.为了在接口两侧启动一个证实模式的传输，在LAPD和LAPDm中使用了一个简单的程

序，它由两条报文组成，它们是和。[SABM（设置异步平衡模式），UA（无编号证实）]

In order to start the transmission in Acknowledge mode at both sides of the interface, a

simple program is used in LAPD and LAPDm, which consists of two packets:

and . [SABM (Set Asynchronous Balanced Mode), UA (Unnumbered Acknowledge)](中级)

17.在无线接口上，同时存在两种相互独立的流，一种专用于传送信令报文，一种用于传送

短消息业务，这两种流通过的链路识别符来区分。[SAPI（业务接入点识别符）]

Two streams independent of each other exist on the radio interface at the same time. One is used to transfer the signaling packet, and the other is used to transfer the short message service. The two streams are distinguished by the link identifier of . [SAPI (Service Access Point Identifier)](中级)

18.A接口的物理层是基于数字传输的链路，链路层是基于七号信令的。

[2Mbit/s的PCM，MTP（消息传递部分）]

The physical layer of A interface is the link based on digital transmission. The link layer is the based on No. 7 signaling. [2Mbit/s PCM, MTP (Message Transfer Part)]

19.在Abis接口上我们可以通过来识别不同TRX的信令链路。[TEI（终端设备标

识）]

On the Abis interface, can be used to identify the signaling links of different TRXs.

[TEI (Terminal Equipment Identifier)]

20.BSSAP（BSS应用部分）可分为和，其中用于透明传

输发往或来自MS的有关呼叫控制和移动性管理的消息。[BSSMAP（BSS管理单元），DTAP（直接传送单元），DTAP]

BSSAP (BSS Application Part) comprises and , where is used to transparently transmit the messages related to call control and mobility management from and to MS. [BSSMAP (BSS Management Application Part), DTAP (Direct Transfer Application Part), DTAP](中级)

21.在A接口上引入虚电路的概念，每个连接的建立和释放都是彼此独立的，这就是CCS7

信令系统中的。[SCCP（信令连接控制部分）]

The concept of virtual circuit is introduced on the A interface. Each connection is set up and released independently of each other. This is in the CCS7 signaling system.

[SCCP (Signaling Connection Control Part)](中级)

22.网络识别参数主要包含小区全球识别（CGI）和基站识别码（BSIC）。其中CGI主要由

和组成。[位置区识别（LAI），小区识别（CI）] The network identification parameter mainly contains Cell Global Identification (CGI) and Base Station Identification Code (BSIC), where CGI consists of

and . [Location Area Identification (LAI), Cell Identification (CI)]

23.小区中BCCH载频的训练序列号应与该小区的相同。[BCC]

The training sequence number of the BCCH carrier frequency in the cell should be the same as of this cell. [BCC]

24.移动台重新进入工作状态后将检测当前所在位置区是否和最后记录在移动台中的位置

区一致，若相同则移动台启动过程，否则移动台启动过程。

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