Nortel Networks Welding System 411-2021-111 ユーザーズマニュアル
2-4
Cell Site Configurations
411-2021-111 Standard 01.01 June 1996
60
°
sectorized configuration
In a 60
°
(N=4) sectorized configuration, the 416 RF channels are divided
among a group of four cells. Each cell contains a maximum of 104 RF
channels, with six Control channels for each cell. Since each cell is further
divided into six sectors, each sector will contain a maximum of 16 or 17 RF
channels, with one Control channels for each sector. The RF channels are
reused by other groups of cells.
channels, with six Control channels for each cell. Since each cell is further
divided into six sectors, each sector will contain a maximum of 16 or 17 RF
channels, with one Control channels for each sector. The RF channels are
reused by other groups of cells.
Figure 2-3 shows the layout of a 60
°
(N=4) sectorized frequency reuse plan.
The RF channels used in Cell 1 of a cluster are reused in Cell 1 of other
clusters, channels in Cell 2 are reused in Cell 2 of other clusters and so on.
This arrangement will have the RF channels on the same carrier frequency in
different areas to be separated from one another by the greatest possible
distance so that co-channel interference is minimized.
clusters, channels in Cell 2 are reused in Cell 2 of other clusters and so on.
This arrangement will have the RF channels on the same carrier frequency in
different areas to be separated from one another by the greatest possible
distance so that co-channel interference is minimized.
However, 60
°
sectorization is difficult to expand and optimize due to a more
demanding environment of frequency re-use.
Figure 2-3
60
60
°
(N=4) sectorized frequency reuse plan
CELL 1
Sector
X
Sector
Y
Sector
Z
Sector
X
Sector
Y
Sector
Z
CELL 2
Sector
X
Sector
Y
Sector
Z
CELL 3
Sector
X
Sector
Y
Sector
Z
CELL 4
Sector
X
Sector
Y
Sector
Z
CELL 1
Sector
X
Sector
Y
Sector
Z
CELL 2
Sector
X
Sector
Y
Sector
Z
CELL 3
Sector
X
Sector
Y
Sector
Z
CELL 4
Sector
X
Sector
Y
Sector
Z
CELL 1
Sector
X
Sector
Y
Sector
Z
CELL 2
Sector
X
Sector
Y
Sector
Z
CELL 4
Sector
X
Sector
Y
Sector
Z
CELL 3
Sector
X
Sector
Y
Sector
Z
CELL 1
Sector
X
Sector
Y
Sector
Z
CELL 2
Sector
X
Sector
Y
Sector
Z
CELL 3
Sector
X
Sector
Y
Sector
Z
CELL 4
Sector
U
Sector
V
Sector
W
Sector
U
Sector
V
Sector
W
Sector
U
Sector
V
Sector
W
Sector
U
Sector
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Sector
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Sector
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Sector
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Sector
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Sector
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Sector
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Sector
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Sector
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Sector
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Sector
U
Sector
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Sector
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Sector
U
Sector
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Sector
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Sector
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Sector
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Sector
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Sector
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Sector
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Sector
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Sector
U
Sector
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Sector
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Sector
U
Sector
V
Sector
W
Sector
U
Sector
V
Sector
W
Sector
U
Sector
V
Sector
W
Sector
U
Sector
V
Sector
W