网规网优试题
Test Questions on Network Planning
and Optimization
I 填空题(14)
Fill in the Following Blanks. (14)
1.
(GSM 规范中规定的(在无跳频情况下),同频干扰保护比 C/I≥
9dB
,考虑到
3dB
的
工程余量,工程中要求同频干扰保护比 C/I≥
12dB
,
规范中规定邻频干扰保护比 C/I ≥
-
9dB
,考虑到
3dB
的工程余量,工程中要求同频干扰保护比 C/I≥
-6dB
。
The GSM specifications define that (when frequency hopping is not available) the co-
frequency interference protection ratio C/I≥
9dB
. Because
3dB
engineering allowance is
reserved, so the co-frequency interference protection ratio in the engineering should be
C/I≥
12dB
. The specifications defines that the adjacent frequency interference protection ratio
C/I ≥
-9dB
. Because
3dB
engineering allowance is reserved, the adjacent frequency
interference protection ratio in the engineering should be C/I≥
-6dB
.
2.
G 网网络规划的需要解决的是
覆盖
、
干扰
、
容量
三大问题。联通公司在频率规划中可用
的频点范围为 96~124。
Coverage
,
interference
and
capacity
are the three major problems that should be solved
during planning of G network. China Unicom can use the frequencies 96~124 during
frequency planning.
3.
GSM 系统中,用户通信占用的信道采用
频分复用(
FDMA
)
和
时分复用(
TDMA
)
两种方式。GSM 频段每
200KHz
分为一个小段,这也是 GSM 系统规定的载频间隔,
每一小段是一个频道,在每个频道中,采用时分复用,分成
8
个时隙。
In the GSM system, the channels occupied by user communication work in two modes:
Frequency Division Multiple Access (FDMA)
and
Time Division Multiple Access (TDMA)
.
The GSM frequency band is segmented every
200KHz
, which is also the interval of carrier
frequency specified for the GSM system. Each segment is a channel. Each channel is divided
into
8
timeslots through TDMA.
4.
描述天线增益通常使用的两个单位是
dBi
和
dBd
。(Gi)dBi=Gd(dBd)
+ 2.15 dB
。
dBi
and
dBd
are the two units that are typically used to describe the antenna gain. (Gi)
dBi=Gd (dBd)
+ 2.15 dB
.
5.
在 GSM 的网络中由
MCC
,
MNC
,
LAC
,
CI
唯一识别全球的基站小区。
In the GSM network,
MCC
,
MNC
,
LAC
and
CI
are used to uniquely identify the cells of
base stations around the world.
6.
从优化调整的对象来看,GSM 系统无线网络优化可以分为
工程参数
优化和资源参数
优化
By the object to be optimized and adjusted, the radio network optimization for the GSM
system can be divided into
engineering parameter
optimization and resource parameter
optimization.