Patent ID: 7555285

Claim:
A method in a base station of detecting cloned communication units, the method comprising: receiving, responsive to a page message, a first response message and a second response message; determining whether a first identification field corresponding to the first response message is equivalent to a second identification field corresponding to the second response message; when the first identification field is equivalent to the second identification field, assessing whether one of a first message content and a first message property corresponding to the first response message is not correlated, respectively, with one of a second message content and a second message property corresponding to the second response message indicating that one of the first response message and the second response message does not correspond to a cloned communication unit; when one of a first message content and a first message property corresponding to the first message is correlated, respectively, with one of a second message content and a second message property corresponding to the second response message, assessing whether the other of the first message content and a first message property corresponding to the message is not correlated, respectively, with the other of the second message content and the second message property corresponding to the second response message; and when the other of the first message content and the first message property is not correlated, respectively, with the other of the second message content and the second message property, deciding that one of the first response message and the second response message corresponds to a cloned communication unit.