Telecommunications – Radiotelephone system – Security or fraud prevention
Reexamination Certificate
2005-08-25
2009-06-30
Ly, Nghi H (Department: 2617)
Telecommunications
Radiotelephone system
Security or fraud prevention
C455S410000, C455S415000, C380S249000, C380S247000, C380S270000
Reexamination Certificate
active
07555285
ABSTRACT:
A method (FIG.3), corresponding call screening unit, and base station (FIG.2), suitable for detecting cloned communication units (111or113), are operable to receive a first response message and a second response message (305); determine whether identification fields (ESNs, MINs) corresponding to the response messages are equivalent (307); and if so, assess whether message contents or message properties corresponding to the response messages are not correlated (311) thus indicating the response messages are from different communication units; and when not correlated, decide that one of the response messages corresponds to a cloned communication unit (313).
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Keels Wayne A.
Thorson Dean E.
Ly Nghi H
Motorola Inc.
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