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periods.
\newpage
-\section*{Abstract} \ No newline at end of file
+\section*{Abstract}
+This thesis examines the possibility to localize mobile users inside of GSM networks.
+While the number of mobile users grow it is possible to provide them with assistance
+information with regard to their location and increase profits. The GPS receivers inside
+of smart phones are exploited to provide the position. This work investigates
+how complicated it is to implement the localization protocol RRLP inside of the existing
+GSM networks and to provide assistance data for the GPS receivers to deliver faster
+and more accurate positions. To obtain the estimated positions two GSM hardware platforms
+have been deployed, dedicated and undedicated GSM hardware. Software for processing
+assistance data has been developed. The generated data by the developed software were
+sent to the employed smart phones. More than half of the tested smart phones delivered
+their position. The obtained results provide a study how the localization system
+could be deployed for assisting GSM users in avoidance of traffic jams as well as
+the risks of such systems if it is abused. \ No newline at end of file