Installation guide

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Wi-Fi Location-Based Services—Design and Deployment Considerations
OL-11612-01
Deployment Best Practices
Figure 53 Location Inspection at 5 m Accuracy
Correlating the colors seen on the floor map display to the legend located at the top right of the screen
indicates that at the 5m accuracy level, the precision can be expected to degrade to about 80–85 percent,
with some pockets showing 75 percent precision.
Note that in both figures there are areas of pure white in proximity to the perimeter access points. This
signifies areas where there was simply not enough local data collected to allow the location inspection
tool to interpolate an estimate. To address this and eliminate these areas from the display, rerun the “Add
Data Points” data collection phase for the calibration model, and be sure to take a sufficient number of
new data points directly in these white areas. After completion, rerun the “Calibration” phase and
re-inspect location quality. These white areas should now be totally eliminated or at least drastically
reduced. The process can be repeated if desired to further address any remaining white areas.
Keep in mind that location inspection relies on the availability of signal strength information as well as
actual location coordinates. Although the Cisco LBS solution allows for the application of a path loss
model to multiple floors (not just the floor on which the model was calibrated), it is only possible to
perform location inspection on floors on which the path loss model was actually calibrated.
Using the information provided by location inspection coupled with a general understanding of
location-based services best practices, you can take action in the way of moving existing or adding
additional access points to bring the performance of the solution inline with expectations.