The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 1999
Filed:
Feb. 28, 1997
Scott D Otterson, Seattle, WA (US);
Dmitry Kaplan, Bellevue, WA (US);
Cellular Technical Services Company, Inc., Seattle, WA (US);
Abstract
A system and method for combining the results of different analysis portions to produce a single YES/NO decision regarding the validity of a present cellular telephone call. A soft data analysis portion of the system analyzes soft data, such as the results of a signature analyzer and a customer call profile and determines the likelihood that the particular call is a valid call from an authorized cellular telephone or an invalid call from a fraudulent cellular telephone. In addition, the system performs a deterministic analysis of the particular phone call to independently designate the particular phone call as valid or invalid. The outputs from the deterministic analyzer and the soft data analyzer portion are combined in a combinatorial logic circuit to produce a single binary output having one logic level for valid calls from the authorized cellular telephone and the opposite logic level for invalid calls from the fraudulent cellular telephone. In addition, the deterministic analyzer may include a control line to override the decision of the soft analyzer to permit calls to designated numbers, such as emergency numbers, even if the independent analysis indicates that the particular call is invalid. In one embodiment, the soft data analyzer portion is a fuzzy logic classifier receiving data inputs and confidence values from the various soft data portions of the system. The fuzzy logic classifier combines the various soft data inputs to produce a single binary output. A sensitivity input is used to vary the threshold of the binary output. The binary output of the fuzzy logic analyzer is combined with the outputs of the deterministic analyzer by the combinatorial logic circuit.