7.
位置区 LAC 的大小,在系统中是一个相当关键的因素,如果 LAC
覆盖范围
过小
,
则移动台发生的位置更新过程将增大,从而增加了系统的信令流量;反之,则网络寻
呼移动台时,同一寻呼消息会在许多小区中发送,这样会导致
PCH
信道的负荷过
重,同时也增加了 ABIS 接口上的信令流量。
LAC is a critical to the system. If the coverage of LAC is
too small
, the location update
process of mobile station will become longer, thus increasing the signaling traffic of the
system. Otherwise, the paging message will be sent in many cells when the network calls the
mobile station, thus overloading the
PCH
and increasing the signaling traffic on the ABIS
interface.
8.
基站识别码(BSIC)是由
NCC
(网络色码)
和
BCC
(基站色码)
组成的,他们各自的
取值范围为:
0 ~
7
。
BSIC (Base Station Identity Code) consists of
NCC (Network Color Code)
and
BCC (Base
station Color Code_)
, both of which have a value range
0~7
.
9.
对 GSM 移动网络运行情况无线部分通常评价指标有:
切换成功率、话务掉话比、掉话
率、无线接通率。
The indexes used to evaluate the operation performance of the radio part of the GSM mobile
network are
handover success rate, call drop rate, wireless call completion rate.
10. 在边际网的工程建设中,边际网的建设方法主要有
插花分布
、
分片分布
。
During construction of boundary network, the equipment is distributed in
hybrid mode
or
separate mode
.
11. GSM2000 可以处理的扫频测试数据有
万禾的
ANTPILOT
扫频数据
和
TEMS
的扫
频数据
。
GSM2000 can process the following frequency sweep test data:
frequency sweep data of
Wanhe ANTPILOT
and
frequency sweep data of TEMS
.
12.
移动通信中,进行覆盖预测时,最通常使用的传播模型是
奥春赫塔模型
、
Lee
模型
。
In the mobile communication, the propagation models used most frequently during coverage
prediction are
Okumura-Hata model
and
Lee’s model
.
13. 频率规划的基本内容包括确定
复用方式
、
小区频点
、
信道配置
Frequency planning includes determining the
reuse mode
,
cell frequency
, and
channel
configuration
.
14. 在相同的传播环境中,1800MHz 比 900Mhz 的贯穿损耗
小
。
1800MHz has a
smaller
breakthrough loss than 900Mhz in the same propagation
environment.
II 选择题(46)
Single or Multiple Choices (46)
1.
DT 路测设备主要是对何种信号进行测量?
B
Which type of signal is the DT (Drive Test) device used to test?
B