Arrangement for detecting fraudulently identified mobile stations in a cellular mobile telecommunications network
First Claim
1. In a mobile telecommunications network comprising a mobile switching center, a method of detecting fraudulently identified mobile stations, comprising:
- in said switching center, upon receipt of a call state change message from a base station system, said message reporting a state change to a present mobile station call state that is one of a plurality of selected mobile station call states, said message comprising a mobile station identifier, accessing a previous call state recorded for a mobile station having said identifier, said selected mobile station call states each representing an operational status of a mobile station, during each call said mobile station passing through a plurality of different call states during each call; and
responsive to accessing said previous call state, if a transition from said previous call state to said present mobile station call state is one of a predetermined set, reporting said transition.
0 Assignments
0 Petitions
Accused Products
Abstract
Apparatus and methods for providing cellular mobile telecommunication service in accordance with the requirements of the Global Systems for Mobile Communications (GSM) standard. A modular switching system is provided which performs the functions of the mobile switching center plus those of a home location register, authentication center, visitor location register, and equipment identity register. The latter functions are advantageously spread among the modules of the switching system, thus avoiding the getting started cost of expensive dedicated data bases. A wireless global switching module advantageously switches mobile communications control messages among the modules of the system and between the modules and the base station systems, and terminates signaling links between the mobile switching center and the base station systems.
-
Citations
18 Claims
-
1. In a mobile telecommunications network comprising a mobile switching center, a method of detecting fraudulently identified mobile stations, comprising:
-
in said switching center, upon receipt of a call state change message from a base station system, said message reporting a state change to a present mobile station call state that is one of a plurality of selected mobile station call states, said message comprising a mobile station identifier, accessing a previous call state recorded for a mobile station having said identifier, said selected mobile station call states each representing an operational status of a mobile station, during each call said mobile station passing through a plurality of different call states during each call; and responsive to accessing said previous call state, if a transition from said previous call state to said present mobile station call state is one of a predetermined set, reporting said transition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 17, 18)
-
-
15. In a mobile telecommunication switching center apparatus for detecting fraudulently identified mobile stations comprising;
-
means for receiving data messages from a base station system generated in response to detected call state changes in mobile stations the call states each representing an operational status of a mobile station during each call, said mobile stations, passing through a plurality of different call states during each call; and processor means responsive to data messages reporting an identifier of a mobile station and a change in state of said mobile station for updating the state of said mobile station and for analyzing a transition from a previous call state to the updated call state; and
responsive to recognizing that said transition is one of a predetermined set, for controlling transmission of a data message for reporting said transition and said identifier of said mobile station. - View Dependent Claims (16)
-
Specification