Method for detecting fraudulent use of a communication system
First Claim
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1. 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.
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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.
38 Citations
10 Claims
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1. A method for detecting fraudulent use of a communication system, comprising the steps of:
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(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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting fraudulent use of a communication system, comprising the steps of:
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(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.
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8. A method for detecting fraudulent use of a communication system, comprising the steps of:
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(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. - View Dependent Claims (9)
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10. A method for detecting fraudulent use of a communication system, comprising the steps of:
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(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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Specification