Handbook

ClearFill Star CDMA
1100187 Rev. 1.0
Page 24 of 152
3.2.2 Coverage area / Architecture drawings
For optimizing a system design it is essential to have knowledge about the areas to be
covered.
A typical indication for the area to be covered is the reception probability:
-85dBm@95%RP means that 95% of the Building has to get covered with a signal strength
level better -85dBm.
Typical values for the minimum signal strength level are in the range of 85dBm to 95dBm, a
reception probability of 98% represents a very high demand.
Building drawings showing the structure of the floors or levels and can be useful to evaluate
type and structure of the walls and other constructions inside (pylons, elevators, stairs, etc).
This is very important for the calculation of the propagation loss which is a main parameter
for the link budget.
To prevent insufficient coverage it is very important to analyze losses from walls or obstacles
in the design process.
The evaluation of all losses for the propagation path is a critical point, because it is not
possible to get exact figures for the RF-attenuation from each wall.
Table 2 shows typical losses for commonly used materials in building constructions.