Zte ZXG10 OB06, Техническое руководство

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Chapter 5 - Networking Modes and System Configurations
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and coaxial cables. Satellite links can be used for special transmission
modes.
System Configuration
There are many ways of BS configuration. In general, a proper number
and types of sites are selected to cater for the requirements of the
operators as well as the concrete geographical environment, and a
minimum hardware configuration should be used to meet the maximum
traffic requirement.
Number and Types of Sites
A radio cellular mobile network, according to its frequency resources and
cell planning, can be divided into a certain number of cells. The cells in a
cellular system are adjacent to each other, as shown in Figure 69.
F
I G U R E
6 9 S
C H E M A T I C
D
I A G R A M O F
C
E L L S
Cell1
Cell3
Cell4
Cell2
Cell5
Cell6
Cell7
Cell9
Cell8
A
B
In the system, each cellular cell is covered by multiple radio channels. If
an omni-antenna is employed, a base station will be set at the center of
each cell (as A in the diagram). And if a directional sectorized antenna is
used, the base station will be established at the intersection of three cells
(as B in the diagram). Such a base station covers three adjacent cells, and
in fact it contains at least three TRXs. Usually, a base station in this kind
of network is called a site. The base site with an omni-antenna covers only
one cell; while the base site with a directional antenna covers three cells.
Types of sites: O-type sites and S-type sites, and the models are shown in
Figure 70.
An O-type site is an omni-directional cell, that is, all the carriers of the
site serve the O-type cell;