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 Detection of cloned communication units based on message contents

Details
Inventors: Thorson, Dean E.; Keels, Wayne A.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Banks-Harold; Marsha D.
Assistant Examiner: Ly; Nghi H.
Attorney, Agent or Firm:

A method (FIG. 3), corresponding call screening unit, and base station (FIG. 2), suitable for detecting cloned communication units (111 or 113), 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).

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT In overview, the present disclosure concerns communications systems that provide service to communications units or more specifically users thereof operating therein.
More particularly various inventive concepts and principles embodied in methods and apparatus for the detection or discovery of cloned or duplicated communication units are discussed.
The communications systems of particular interest are those being deployed such as CDMA2000 spread spectrum systems although the principles and concepts can have application in many other wide area or local area systems where differences between a cloned and unauthorized versus authorized communication unit can be detected or discovered based on differences between signals that are provided by such units.
As further discussed below various inventive principles and combinations thereof are advantageously employed to detect or discover a cloned or duplicated communication unit based on expected or resultant impacts on inbound signals that can result from such units, thus alleviating various problems associated with cloned communication units, such as the monitoring of legitimate communications with authorized communication units.
This is accomplished in a cost effective low latency manner provided these principles or equivalents thereof are utilized.
The disclosed approaches can be used in conjunction with other authentication or authorization techniques and equipment and still yield a low latency approach, at least until a possible cloned unit is detected thereby causing a more thorough authentication process, etc.
to be utilized.
The instant disclosure is provided to further explain in an enabling fashion the best modes of making and using various embodiments in accordance with the present invention.
The disclosure is further offered to enhance an understanding and appreciation for the inventive principles and advantages thereof, rather than to limit in any manner the invention.
The invention is defined solely by the appended claims including any amendments made during the pendency of this application and all equivalents of those claims as issued



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