초록 ▼

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 loc

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.

대표청구항 ▼

[ What is claimed is:] [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

[ What is claimed is:] [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; anddetecting fraud if the channel identifying data for said first and second RF channels do not match.