DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT Generally, the present invention provides a method for detecting the location of an unauthorized communication unit in a wireless communication system.
This may be accomplished by determining that an identification code being used by a communication unit has been validated in an unauthorized manner.
Having determined this, the site from which the communication unit is transmitting is determined.
With the transmitting site determined, RF receivers in the proximity of the transmitting site are enabled to receive a subsequent RF transmission from the communication unit.
The RF transmissions received by the RF receivers are then used to calculate the location of the communication unit.
With such a method, the location of an unauthorized communication unit may be determined such that the person operating the unit may be apprehended, or the communication unit retrieved.
The present invention can be more fully described with reference to FIGS.
1-3.
FIG.
1 illustrates a wireless communication system 100 that includes two sites, which are defined by their coverage areas 121, 122.
To one skilled in the art, it is readily apparent that the wireless communication system 100 may include more or less sites.
Each site includes a communication resource controller, or central controller, 101, 117, communication resources 103, repeaters 104-108, 112-116, a database 104, 118, communication units 102, RF receivers 110, 111, 119, 120 and a monitoring computer 123.
While only a few RF receivers are shown, one skilled in the art will appreciate that many more RF receivers could be used and that the more RF receivers used, the more accurately the location can be determined.
In operation, a communication unit 102 may request access to the communication system 100 by transmitting an inbound signaling word (ISW) to the central controller 101, 117, via a communication resource dedicated for control information (i.
e.
, a control channel).
The ISW includes the communication unit's unique ID, an ID of a target unit (i
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Telecommunications 
