2. How does it work?
CellViz is a mobile app that collects GPS and cell signal
information simulatenously
To collect data, run the CellViz mobile app
(e.g., Android) on the device
Click “Start” to begin recording
Click “Stop” to stop recording
The app collects the data, and emails you the results:
CSV file – can be imported into any spreadsheet
software
KML file – can be visualized in Google Earth
(C) 2012 Barbeau Development
3. What cell networks are supported?
CellViz can potentially be used to analyze any type of
cellular network that is exposed via a developer API.
CellViz has been implemented on Android v2.1 and
higher for:
CDMA, 1xRTT, EVDO, and WiMax
GSM
iDEN
(C) 2012 Barbeau Development
4. What data is collected? (1)
CellViz collects the following values for each GPS fix:
Latitude and Longitude (in decimal degrees), and
Altitude (in meters)
Timestamp (to the millisecond)
Speed (meters/sec)
Bearing (i.e., Heading) in 0-359 degrees
Estimated Horizontal Accuracy (i.e., how accurate the
positioning technology thinks the position is)
Number of Satellites used to calculate the position
(C) 2012 Barbeau Development
5. What data is collected? (2)
CellViz is capable of collecting the following cell signal
data (if available) simultaneous to each GPS fix:
RSSI
EC/IO
Bit Error Rate
Signal-to-Noise ratio
base station ID
base station location
network ID
sector ID
(continued on next slide…)
(C) 2012 Barbeau Development
6. What data is collected? (3)
CellViz is capable of collecting the following signal data (if
available) related to each GPS fix:
…
MAC address
Frequency
Channel
IP address
NAPID
Connection time
CINR
Link speed
NSPID
Transmission power
(C) 2012 Barbeau Development
7. Visualize results in Google Earth
Google Earth allows 4D
visualization of your cell
network data, including:
3D camera orientation
Time-lapse for handoffs
3D tower models
3D building models
3D terrain modeling
Some screenshots follow
(C) 2012 Barbeau Development
8. See each cell signal sample with lines drawn to serving tower
(C) 2012 Barbeau Development
9. Folders on the left organize data
(C) 2012 Barbeau Development
11. See 3D buildings and their effect on signal strength
(C) 2012 Barbeau Development
12. Color and altitude of circles represent signal strength
(C) 2012 Barbeau Development
13. Diameter of circle represents accuracy of GPS
(C) 2012 Barbeau Development
14. View 3D terrain’s effect on signals
As the mountain blocks the phone’s line-of-sight with
the tower, cell signal quality decreases
(C) 2012 Barbeau Development