Detection of duplicate identification codes in communication units
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04Q-003/02
G06K-015/00
출원번호
US-0389613
(1995-02-16)
발명자
/ 주소
Grube Gary W. (Barrington IL) Markison Timothy W. (Austin TX)
출원인 / 주소
Motorola, Inc. (Schaumburg IL 02)
인용정보
피인용 횟수 :
20인용 특허 :
0
초록▼
A monitoring computer (115) monitors the communications occurring within at least one communication system for a unique communication unit identification (ID) code associated with a communication unit (105, 110). In a first embodiment, for each occurrence of the unit ID code, the monitoring computer
A monitoring computer (115) monitors the communications occurring within at least one communication system for a unique communication unit identification (ID) code associated with a communication unit (105, 110). In a first embodiment, for each occurrence of the unit ID code, the monitoring computer determines a location of the communication unit affiliated with that unit ID code. When two or more instances of the unit ID code occur within a predetermined period of time at locations separated by more than a predetermined distance, the unit ID code is identified as a potentially duplicated unit ID code. In a second embodiment, a counter is incremented for each occurence of the unit ID code. If the counter exceeds a predetermined number within a predetermined period of time, the unit ID code is identified as a potentially duplicated unit ID code.
대표청구항▼
In a radio communication system, a method for detecting unauthorized duplication of a first RF communication unit identity, the method comprising the steps of: a) operably receiving, by a monitoring computer, a first RF transmission, wherein the first RF transmission includes the first RF communicat
In a radio communication system, a method for detecting unauthorized duplication of a first RF communication unit identity, the method comprising the steps of: a) operably receiving, by a monitoring computer, a first RF transmission, wherein the first RF transmission includes the first RF communication unit identity; b) when the first RF transmission is received, determining, by the monitoring computer, source location of the first RF transmission; c) storing, by the monitoring computer in a data base, the source location of the first RF transmission and the first RF communication unit identity; d) within a predetermined period of time after receiving the first RF transmission, operably receiving, by the monitoring computer, a second RF transmission, wherein the second RF transmission includes a second RF communication unit identity; e) when the second RF transmission is received, determining by the monitoring computer, source location of the second RF transmission; f) comparing, by the monitoring computer, the first RF communication unit identity with the second RF communication unit identity; g) when the first RF communication unit identity substantially matches the second RF communication unit identity, determining, by the monitoring computer, a difference between the source location of the first RF transmission and the source location of the second RF transmission; and h) when the difference exceeds a predetermined distance, identifying, by the monitoring computer, the unauthorized duplication of the first RF communication unit identity.
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이 특허를 인용한 특허 (20)
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