Page 252 - Integrated Wireless Propagation Models

230 C h a p t e r F o u r

The position of a mobile as well as a cell site needs to be extremely accurate. Using only
CPS is not recommended in positioning urban microcell measurement data collection.
Utilizing both ETAK and CPS is more accurate in collecting measured data. In cities where
no ETAK data are available, road markers are used to keep track of the positions between
the cell site and mobiles. Comparisons with collected measurement data demonstrate that
the model does perform exceptionally well in varying mobile environments with different
cell site parameters.

4.3.3 Validation of the Model: Measured versus Predicted
The integrated microcell and macrocell models are validated in both 900- and 1800-MHz
frequency bands based on the collected measurement data. Some comparisons with
collected data in different countries/ cities are shown here for demonstration pur­
poses. Figures 4.3.3.1 to 4.3.3.4 show the RSSI signals along the different radial dis­
tances and CDF in percentage of the deviation between measured and predicted.
From the four figures (Figs. 4.3.3.1 to 4.3.3.4), their deviations in dB at 60% of data (CDF)

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FIGURE 4.3.3.1 Route A_0044_01. (a) Measured and predicted versus distance. (b) CDF of
difference between measured and predicted.