ZTE Corporation ZXG-BTS2 Manuale Utente
Chapter 5 - Networking Modes and System Configurations
Confidential and Proprietary Information of ZTE CORPORATION 93
In actual networking projects, due to the decentralized sites, unlike basic
networking modes, the transmission equipment is usually used for
intermediate connection between BSC and BTS. The transmission modes
intermediate connection between BSC and BTS. The transmission modes
commonly employed are Microwave, optical cable, HDSL cable and coaxial
cable. Satellite links can be used for special transmission modes.
cable. Satellite links can be used for special transmission modes.
System Configuration
There are many ways of BS configuration. In common practice, 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
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 that abut on
cell planning, can be divided into a certain number of cells that abut on
each other with one cellular system. Figure 78 illustrates the structure.
F
I G U R E
7 8
C
E L L S I N A
C
E L L U L A R
S
Y S T E M
C ell1
C ell3
C ell4
C ell2
C ell5
C ell6
C ell7
C ell9
C ell8
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
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
(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 stationsite with an omni-antenna
covers only one cell; while the base stationsite with a directional antenna
covers only one cell; while the base stationsite with a directional antenna
covers three cells.
There are two types of sites: O-type and S-type. An O-type site refers to
an omni-directional cell. That is, all the frequencies of one site serve this
O-type cell. An S-type site refers to a sectorized cell. Typically, a three-
O-type cell. An S-type site refers to a sectorized cell. Typically, a three-
sector site is preferred; that is, each site has three sectors. Models of the
O-type site and S-type site are shown in Figure 79.
O-type site and S-type site are shown in Figure 79.