EP0544449A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Arrangement for detecting fraudulently identified mobile stations in a cellular mobile telecommunications network
Assignee: AT&T Inc
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Filing: 1992-11-19
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Granted: —
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Expires: 2012-11-19
Abstract
Abstract This invention relates to 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 (210) plus those of a home location register (212), authentication center (216), visitor location register (214), and equipment identity register (218). 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 (204), and terminates signaling links between the mobile switching center and the base station systems.
Inventors
- 👤 Jack Kozik
- 👤 Chinmei Chen Lee
- 👤 Dennis James Wiest
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 14:32
CPC Classifications
H; H04; H04W; H04W12/00; H04W12/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
68 words
In a mobile telecommunications network, a method of detecting fraudulently identified mobile stations, comprising: upon receipt of state change messages to one of a selected plurality of new mobile station states, said messages comprising a mobile station identifier, accessing a previous state recorded for a mobile station having said identifier, and if a transition from said previous state to said new state is unlikely, reporting said state transition.
Claim 2
Dependent Claim
29 words
The method of claim 1 wherein said new states are one of attach and detach and wherein said transition is one of attach while attach or detach while detach.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein said previous state is detach and wherein said new state change message is a connection management service request.
Claim 4
Dependent Claim
33 words
The method of claim 1 wherein said previous state is one of an attach or a detach process in progress and wherein said new state change message is a connection management service request.
Claim 5
Dependent Claim
28 words
The method of claim 1 wherein said previous state is waiting for page response and wherein said state change messages are multiple page responses for the same identifier.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein said previous state is location update in progress and wherein said state change message is another location update request.
Claim 7
Dependent Claim
27 words
The method of claim 1 wherein said previous state is location update in progress and wherein said new state change message is a connection management service request.
Claim 8
Dependent Claim
27 words
The method of claim 1 wherein said previous state is an active connection management transaction and wherein said new state change message is a location update request.
Claim 9
Dependent Claim
27 words
The method of claim 1 wherein said previous state is an active connection management transaction and wherein said new state change message is a cancel location request.
Claim 10
Dependent Claim
20 words
The method of claim 5,6,7,8 or 9 wherein said reporting step comprises the step of issuing a fradulent identifier report.
Claim 11
Dependent Claim
18 words
The method of claim 1 further comprising: issuing a fraudulent identifier report if said state transition is impossible.
Claim 12
Dependent Claim
41 words
The method of claim 1 further comprising: accumulating counts of unlikely transitions for mobile station identifiers for which unlikely state transition reports have been made; and issuing probable fraudulent identifier reports for mobile station identifiers whose count exceeds a predetermined threshold.
Claim 13
Dependent Claim
85 words
In a mobile telecommunication switching center apparatus for detecting fraudulently identified mobile stations comprising: processor means operative under control of a program and responsive to data messages indicating a state transition of a mobile station for updating the state of said mobile station and for analyzing the transition from a previous state to the updated state; and responsive to recognizing that said transition is unlikely, for controlling transmission of a data message for reporting said unlikely state transition and an identifier of said mobile station.
Claim 14
Dependent Claim
53 words
The apparatus of claim 13 wherein said processor means is further responsive to said recognizing for analyzing said transition to determine whether it is impossible if only a single mobile station has a given identifier, and is responsive to said determining for controlling transmission of a data message for reporting a fraudulent identifier.
References Cited (Backward Citations)
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