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Introduction
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This is an example
of an optimization project of an urban scenario. The project
is based on the CDMA air interface. As shown in the picture
below there are 18 sites located in the city - each site
with three transmitters. This means there are 54 transmitter
available.
The network
optimizer is used to determine the relevant sites to achieve
a good coverage. The goal of the optimization is not to get
a network configuration which is able to offer the highest
service everywhere, but to have all areas covered in the
city.
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Cell Areas
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The following image
shows the cell areas of the active transmitters after
optimization. From 54 transmitters, 23 transmitters are
considered as relevant by the network optimizer. The white
arrows show the active transmitters after optimization.
The total area is
covered, even with only 23 transmitters.
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Interference
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The image below
shows the Eb/No in the urban area. The selection of the
relevant transmitters is also based on the Eb/No thresholds
defined by the user. Here the minimum required Eb/No is 3 dB
- and this requirement is met everywhere.
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Detailed evaluation of results
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The results
obtained by the network optimizer are presented in a table.
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Site |
Priority |
Carrier |
Individual Coverage |
Total Coverage |
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Site 12 Ant 2 |
1 |
0 |
51,24% |
51,17% |
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Site 14 Ant 3 |
2 |
0 |
4,51% |
55,17% |
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Site 11 Ant 3 |
3 |
0 |
5,97% |
57,81% |
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Site 5 Ant 3 |
4 |
0 |
8,27% |
62,23% |
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Site 6 Ant 2 |
5 |
0 |
8,03% |
63,24% |
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Site 15 Ant 3 |
6 |
0 |
6,32% |
64,90% |
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Site 12 Ant 1 |
7 |
0 |
7,63% |
66,27% |
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Site 11 Ant 2 |
8 |
0 |
12,12% |
67,38% |
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Site 6 Ant 3 |
9 |
0 |
12,09% |
68,06% |
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Site 16 Ant 1 |
10 |
0 |
8,97% |
68,84% |
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Site 8 Ant 2 |
11 |
0 |
6,47% |
69,89% |
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Site 5 Ant 2 |
12 |
0 |
12,28% |
70,87% |
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Site 4 Ant 3 |
13 |
0 |
16,36% |
71,61% |
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Site 8 Ant 3 |
14 |
0 |
25,38% |
72,50% |
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Site 7 Ant 2 |
15 |
0 |
31,93% |
73,48% |
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Site 2 Ant 1 |
16 |
0 |
18,34% |
74,34% |
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Site 3 Ant 3 |
17 |
0 |
19,07% |
75,24% |
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Site 4 Ant 2 |
18 |
0 |
20,41% |
76,15% |
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Site 10 Ant 1 |
19 |
0 |
13,04% |
77,02% |
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Site 1 Ant 3 |
20 |
0 |
39,43% |
78,10% |
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Site 3 Ant 2 |
21 |
0 |
41,04% |
78,90% |
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Site 13 Ant 2 |
22 |
0 |
17,67% |
79,70% |
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Site 13 Ant 3 |
23 |
0 |
42,96% |
80,71% |
In this case the total coverage is only 80% as pixels inside
buildings are not considered. This means about 20% of the
pixels are located inside buildings and are not counted for
the evaluation.
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Read more about Network
Planning
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Read more about Propagation
Models
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