US5777558A
Expired / Lapsed
US
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Method for detecting fraudulent use of a communication system
Assignee: Google Technology Holdings LLC
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Filing: 1996-02-29
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Granted: 1998-07-07
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Expires: 2016-02-29
Abstract
Abstract A method for detecting fraudulent use of a communication system (10) includes the steps of determining a system parameter associated with a subscriber unit (32). The system then compares the system parameter to a previous system parameter for the subscriber unit (32). An alarm is set when the system parameter differs more than a predetermined amount from the previous system parameter.
Inventors
- 👤 Frank Pennypacker
- 👤 Richard J. Corrigan
- 👤 Timothy M. Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:20
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/47; H04M3/00; H04M3/22; H04M3/26; H04M3/28; H04M3/30; H04W; H04W12/00; H04W12/12; H04W12/126; H04M2215/00; H04M2215/01; H04M2215/0148; H04M3/36
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
A method for detecting fraudulent use of a communication system, comprising the steps of: (a) determining a system parameter associated with a subscriber unit; (b) comparing the system parameter to a previous system parameter for the subscriber unit; (c) when the system parameter differs more than a predetermined amount from the previous system parameter, setting an alarm condition; (d) determining the system parameter for a plurality of neighboring subscriber units; and (e) when the system parameter differs more than the predetermined amount from the previous system parameter for more than a predetermined number of the plurality of neighboring subscriber units, canceling the alarm condition.
Claim 2
Independent Claim
104 words
A method for detecting fraudulent use of a communication system, comprising the steps of: (a) determining a system parameter associated with a subscriber unit; (b) comparing the system parameter to a previous system parameter for the subscriber unit; (c) when the system parameter differs more than a predetermined amount from the previous system parameter, setting an alarm condition; (d) determining the system parameter for a plurality of neighboring subscriber units; and (e) when the system parameter differs more than the predetermined amount from the previous system parameter for more than a predetermined number of the plurality of neighboring subscriber units, canceling the alarm condition.
Claim 3
Dependent Claim
20 words
The method of claim 1, wherein step (a) includes determining a time delay between a base and the subscriber unit.
Claim 4
Dependent Claim
19 words
The method of claim 1, wherein step (a) includes determining a required transmit power level for the subscriber unit.
Claim 5
Dependent Claim
22 words
The method of claim 1, wherein step (a) includes determining a number of responses to a base query of the subscriber unit.
Claim 6
Dependent Claim
20 words
The method of claim 1, wherein step (a) includes determining a distance between a base unit and the subscriber unit.
Claim 7
Dependent Claim
18 words
The method of claim 1, further including the step of: (d) measuring a distance to the subscriber unit.
Claim 8
Independent Claim
134 words
A method for detecting fraudulent use of a communication system, comprising the steps of: (a) initiating a communication session by a base unit to a subscriber unit; (b) counting a number of times the subscriber unit responds to an alert transmitted by the base unit; (c) when the number of times exceeds a predetermined number, determining an alarm condition exists; (d) determining a delta delay value between the base unit and the subscriber unit; (e) when the delta delay value exceeds a predetermined delta delay value, determining the alarm condition exists; (f) determining the delta delay value for a plurality of neighboring subscriber units; and (g) when the delta delay value for more than a predetermined number of the plurality of neighboring subscriber units exceeds the predetermined delta delay value, canceling the alarm condition.
Claim 9
Independent Claim
134 words
A method for detecting fraudulent use of a communication system, comprising the steps of: (a) initiating a communication session by a base unit to a subscriber unit; (b) counting a number of times the subscriber unit responds to an alert transmitted by the base unit; (c) when the number of times exceeds a predetermined number, determining an alarm condition exists; (d) determining a delta delay value between the base unit and the subscriber unit; (e) when the delta delay value exceeds a predetermined delta delay value, determining the alarm condition exists; (f) determining the delta delay value for a plurality of neighboring subscriber units; and (g) when the delta delay value for more than a predetermined number of the plurality of neighboring subscriber units exceeds the predetermined delta delay value, canceling the alarm condition.
Claim 10
Independent Claim
113 words
A method for detecting fraudulent use of a communication system, comprising the steps of: (a) measuring a delta time delay between a base unit and a subscriber unit; (b) measuring a delta transmit power for the subscriber unit; (c) when the delta time delay exceeds a maximum delta time delay, setting an alarm; (d) when the delta transmit power exceeds a maximum delta transmit power, setting the alarm; (e) when the alarm is set, measuring the delta time delay for a plurality of neighboring subscriber units; and (f) when the delta time delay for a predetermined number of the plurality of neighboring subscriber units exceeds the maximum delta time delay, canceling the alarm.
Claim 11
Independent Claim
113 words
A method for detecting fraudulent use of a communication system, comprising the steps of: (a) measuring a delta time delay between a base unit and a subscriber unit; (b) measuring a delta transmit power for the subscriber unit; (c) when the delta time delay exceeds a maximum delta time delay, setting an alarm; (d) when the delta transmit power exceeds a maximum delta transmit power, setting the alarm; (e) when the alarm is set, measuring the delta time delay for a plurality of neighboring subscriber units; and (f) when the delta time delay for a predetermined number of the plurality of neighboring subscriber units exceeds the maximum delta time delay, canceling the alarm.
Claim 12
Dependent Claim
55 words
The method of claim 8, further including the steps of: (e) when the alarm is set, measuring the delta transmit power for a plurality of neighboring subscriber units; and (f) when the delta transmit power for a predetermined number of the plurality of neighboring subscriber units exceeds the maximum delta transmit power, canceling the alarm.
Claim 13
Independent Claim
133 words
A method for detecting fraudulent use of a communication system, comprising the steps of: (a) initiating a communication session by a base unit to a subscriber unit; (b) counting a number of times the subscriber unit responds to an alert transmitted by the base unit; (c) when the number of times exceeds a predetermined number, determining an alarm condition exists (d) determining a delta transmit power for the subscriber unit; and (e) when the delta transmit power exceeds a predetermined delta transmit power value, determining the alarm condition exists; (f) determining the delta transmit power for a plurality of neighboring subscriber units; and (g) when the delta transmit power for more than a predetermined number of the plurality of neighboring subscriber units exceeds the predetermined delta transmit power value, canceling the alarm condition.
Claim 14
Independent Claim
133 words
A method for detecting fraudulent use of a communication system, comprising the steps of: (a) initiating a communication session by a base unit to a subscriber unit; (b) counting a number of times the subscriber unit responds to an alert transmitted by the base unit; (c) when the number of times exceeds a predetermined number, determining an alarm condition exists (d) determining a delta transmit power for the subscriber unit; and (e) when the delta transmit power exceeds a predetermined delta transmit power value, determining the alarm condition exists; (f) determining the delta transmit power for a plurality of neighboring subscriber units; and (g) when the delta transmit power for more than a predetermined number of the plurality of neighboring subscriber units exceeds the predetermined delta transmit power value, canceling the alarm condition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-06 | 2002-01-05 | 2002-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-06 | 2006-01-05 | 2006-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-06 | 2010-01-05 | 2010-07-07 | $7700.00 | Window Closed / Lapsed |