Method of detecting fraud in a radio communications network by analyzing activity, identification of RF channel data for mobile stations in the network
First Claim
1. In a radio communications system communicating with a plurality of mobile stations over a plurality of radio frequency (RF) channels, each of said mobile stations transmitting mobile identifying data when accessing said system and each of said RF channels being designated by channel identifying data, at least some of the RF channels being used in a part of said system being reused in a different part of said system, a method of detecting fraud in said system comprising the steps of:
- receiving at said system a first system access over a first RF channel;
receiving at said system a second system access over a second RF channel, said second system access having the same mobile identifying data as said first system access;
comparing the channel identifying data for said first and second RF channels to determine whether said first and second RF channels comprise one RF channel used in two different parts of the system and accessed by the same mobile station or, alternatively two different RF channels accessed by two different mobile stations having the same mobile identifying data; and
detecting fraud if the channel identifying data for said first and second RF channels do not match.
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Accused Products
Abstract
A method for detecting fraud in a cellular radio telephone system. Fraud is suspected when the system detects a multiple access from a mobile station, when an activity collision occurs, when the system receives a premature registration from the mobile station, when auditing or operator-initiated locating of the mobile station reveals the existence of the mobile station in two locations simultaneously, or when tracing of mobile subscriber activity reveals unusual activity.
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Citations
12 Claims
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1. In a radio communications system communicating with a plurality of mobile stations over a plurality of radio frequency (RF) channels, each of said mobile stations transmitting mobile identifying data when accessing said system and each of said RF channels being designated by channel identifying data, at least some of the RF channels being used in a part of said system being reused in a different part of said system, a method of detecting fraud in said system comprising the steps of:
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receiving at said system a first system access over a first RF channel; receiving at said system a second system access over a second RF channel, said second system access having the same mobile identifying data as said first system access; comparing the channel identifying data for said first and second RF channels to determine whether said first and second RF channels comprise one RF channel used in two different parts of the system and accessed by the same mobile station or, alternatively two different RF channels accessed by two different mobile stations having the same mobile identifying data; and detecting fraud if the channel identifying data for said first and second RF channels do not match. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting fraudulent activities among a plurality of mobile stations in a radio communications network, each of said mobile stations subscribing service from a home system and being capable of receiving service from at least one other system in said network, the method comprising the steps of:
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assigning in said home system at least one mobile station to a tracing class; reporting from said at least one other system to said home system selected activities of any one of said mobile stations in said at least one other system if said one mobile station is assigned to said tracing class or its activities are within a region marked as a fraud region by said at least one other system; and analyzing in said home system the reported activities of said one mobile station to determine whether there are fraudulent activities by other mobile stations having the identity of said one mobile station. - View Dependent Claims (8, 9, 10)
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11. In a radio communications system communicating with a plurality of mobile stations, each of said mobile stations transmitting a mobile identification number (MIN), an electronic serial number (ESN) and a station class mark (SCM) when accessing said system, a method of detecting fraud in said system comprising the steps of:
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receiving at said system a first system access including the MIN, ESN and SCM for a mobile station; receiving at said system a second system access including the same MIN and ESN as in said first system access; comparing the SCM in said second system access with the SCM in said first system access; and detecting fraud if the SCMs in said first and second system accesses do not match. - View Dependent Claims (12)
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Specification