Short Message Service (sms) security solution for mobile devices

4. 
SMS Blue Force Tracking (Personnel) 
Personnel tracking in an urban area is difficult because the “concrete 
jungle” is not a favorable environment for radio frequency propagation. GPS 
information may also be affected due to lack of line-of-sight to satellites. 
Research has shown that a pure client-based GSM localization system can 
achieve median localization accuracies of 5 and 75 meters for indoor and 
outdoor environments, respectively [37]. If the information can be further 
correlated with the Base Transceiver Stations (BTS), better accuracies may be 
achieved. Currently small portable GSM BTS are commercially available that can 
be set up quickly. If a few of such BTS can be set up near the area of operations, 
the mini-GSM network can be used to provide positional information for individual 
soldiers. The information can then be sent back to the Command Post to provide 
a situation of the Blue Force disposition. The key research question is the 
positional accuracy that can be achieved using portable GSM BTS.

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APPENDIX A. 
POWER CONSUMPTION EXPERIMENT 
A. PRE-MEASUREMENT 
CHECKLIST 
The following settings are checked prior to each measurement to ensure 
consistency of measurements: 
Feature 
Setting 
Wifi OFF 
GSM OFF 
Bluetooth OFF 
Active Processes 
File Explorer is the only process 
running. This is because File Explorer 
is required to start the application 
LCD Backlight Setting: Battery Power 
“Turn off backlight if device is not used 
for “
– 30 sec 
LCD Backlight Setting: Battery Power 
“Turn on backlight when a button is 
pressed or the screen is tapped”
– 
Enabled 
LCD Backlight: Brightness Level 
6 / 10 
“Auto adjust backlight level by battery 
level” – 
Disabled
 
“Auto adjust backlight level by idle time” 
- 
Disabled
 
Power Management: Sleep Mode 
Settings: On Battery Power 
“Turn off device if not used for”
- 
Disabled 
Power Management: Sleep Mode 
Settings: On External Power 
“Turn off device if not used for”
- 
Disabled 
Table 9. Pre-Measurement Checklist 

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