Cellular telephone anti-fraud system
US6047174A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 2, 1998 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Mar 2, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W12/72
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Apparatus for identifying wireless subscriber units and for granting or denying access to a subscriber service includes a plurality of wireless subscriber units each for generating a wireless subscriber signal including internal data traits and external signal traits. The internal data traits include an identification code. The plurality of wireless subscriber units also receive a transmitter/receiver signal. A receiver/transmitter is located remote from the wireless subscriber units and receives the wireless subscriber signal and transmits the transmitter/receiver signal. A characterizing device is connected to the receiver/transmitter and generates a plurality of characterizing signals for one of said wireless subscriber units. The characterizing device generates said plurality of characterizing signals by measuring features of said external traits of said one of said wireless subscriber signal from at least one of a first category including variations of specified parameters of said one of said wireless subscriber units, a second category including variations in non specified parameters, and a third category including variations in reactions or responses to interrogations. A con…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.