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Method and systems are employed by a wireless location system (WLS) for locating a wireless device operating in a geographic area served by a wireless communications system. An exemplary method includes defining a geo-fenced area. The method then includes monitoring a set of predefined signaling lin

Method and systems are employed by a wireless location system (WLS) for locating a wireless device operating in a geographic area served by a wireless communications system. An exemplary method includes defining a geo-fenced area. The method then includes monitoring a set of predefined signaling links of the wireless communications system, and detecting that a mobile device has performed any of the following acts with respect to the geo-fenced area: (1) entered the geo-fenced area, (2) exited the geo-fenced area, and (3) come within a predefined degree of proximity near the geo-fenced area. A high-accuracy location function may then be triggered in order to determine the geographic location of the mobile device.

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1. A system for use in or by a wireless communications system, comprising: a links monitoring system (LMS) for monitoring one or more signaling links of the wireless communications system;a mechanism for defining a geo-fenced area by setting a common Location Area Code (LAC) in a broadcast control c

1. A system for use in or by a wireless communications system, comprising: a links monitoring system (LMS) for monitoring one or more signaling links of the wireless communications system;a mechanism for defining a geo-fenced area by setting a common Location Area Code (LAC) in a broadcast control channel (BCCH) of a plurality of cells or sectors that cover an area to be geo-fenced, thereby enabling detection of a mobile device's entry into and exit out of the geo-fenced area by causing at least one of an automatic, mobile device initiated, location update transaction, a handover transaction, and a Network Measurement Report (NMR) transaction; anda mechanism for detecting that a mobile device has performed any of the following acts with respect to the geo-fenced area: (1) entered said geo-fenced area, (2) exited said geo-fenced area, and (3) come within a predefined degree of proximity near said geo-fenced area;wherein the system is configured to define a static geo-fenced area by setting a common LAC in a plurality of cells or sectors that cover a specified area to be geo-fenced, whereby entry into and exit out of the geo-fenced area is detectable even if the mobile device is idle before the entry and exit;wherein the system is configured to use a process for detecting an idle mobile device, the process comprising: setting a LAC in a BCCH of selected cells so as to define the geo-fenced area;setting triggers for cell global identities (CGIs) in the geo-fenced area and for any location update transactions; in response to an idle mobile device entering the geo-fenced area, detecting the LAC broadcast in the BCCH, initiating a location update transaction, detecting the location update transaction, and collecting data concerning mobile identity, CGI, and radio frequency (RF) channel; anddelivering the data to a location application;wherein the system is configured to use a process for detecting a mobile device during handover, the process comprising: setting a LAC in a BCCH of selected cells;setting triggers for CGIs in the geo-fenced area and for any handover transactions; anddetecting a mobile device's presence in the geo-fenced area when the mobile device enters the proximity of the geo-fenced area and performs a handover to a CGI within the geo-fenced area; andwherein the system is configured to use a process for detecting a mobile device using proximity detection, the process comprising: setting a LAC in a BCCH of selected cells defining the geo-fenced area;setting triggers for CGIs in the geo-fenced area and for any NMR transactions; andin response to a mobile device on a call entering the proximity of the geo-fenced area, adding a CGI from the geo-fenced area to an NMR and detecting an NMR list containing a geo-fenced CGI. 2. A system as recited in claim 1, wherein the mechanism for defining a geo-fenced area is configured to use existing wireless communications system parameters, including any of: the Location Area (LA), the Location Area Code (LAC), and the Location Area Index (LAI), and their non-GSM equivalents. 3. A system as recited in claim 1, wherein the mechanism for defining a geo-fenced area comprises a deployment of location measuring units (LMUs) at selected sites. 4. A system as recited in claim 1, wherein said geo-fenced area comprises a geographic area contained within at least one cell of the wireless communications system. 5. A system as recited in claim 1, wherein said geo-fenced area comprises a geographic area contained within a plurality of cells of the wireless communications system. 6. A system as recited in claim 1, wherein said geo-fenced area comprises a geographic area defined, in part, by at least one sector of a cell of the wireless communications system. 7. A system as recited in claim 1, wherein said geo-fenced area comprises an area whose perimeter is defined by the joint coverage areas of a plurality of base transceiver station (BTS) antennae sectors. 8. A system as recited in claim 1, wherein said geo-fenced area comprises an area whose perimeter is defined by the joint coverage areas of a plurality of location measuring unit (LMU) antennae sectors. 9. A system as recited in claim 1, further comprising a mechanism for triggering a high-accuracy, uplink time difference of arrival (U-TDOA)-based location function for determining the geographic location of said mobile device. 10. A system as recited in claim 9, wherein said high-accuracy location function comprises the use of plural location measuring units (LMUs) and U-TDOA algorithms. 11. A system as recited in claim 9, wherein said high-accuracy location function comprises the use of at least one location measuring unit (LMU) and uplink angle of arrival (AoA) algorithms. 12. A system as recited in claim 9, wherein said high-accuracy location function comprises the use of plural location measuring units (LMUs) and hybrid U-TDOA and angle of arrival (AoA) algorithms. 13. A system as recited in claim 1, further comprising a mechanism for triggering a low-accuracy, CGI based location function for determining the geographic location of said mobile device. 14. A system as recited in claim 1, further comprising a mechanism for triggering a medium-accuracy, enhanced cell ID (ECID)-based location function for determining the geographic location of said mobile device. 15. A system as recited in claim 1, wherein said predefined signaling links include an Abis link between a base transceiver station (BTS) and a base station controller (BSC). 16. A system as recited in claim 1, wherein said predefined signaling links include an A link between a base station controller (BSC) and a mobile switching center (MSC). 17. A system as recited in claim 1, wherein said predefined signaling links include a GSM-MAP link. 18. A system as recited in claim 1, wherein said predefined signaling links include an Iub link. 19. A system as recited in claim 1, wherein said predefined signaling links include an Iu-PS link. 20. A system as recited in claim 1, wherein said predefined signaling links include an Iu-CS link. 21. A system as recited in claim 1, further comprising a radio network monitor (RNM) configured to monitor a radio link between a base transceiver station (BTS) and a wireless device. 22. A system as recited in claim 21, wherein the RNM is configured to monitor RACH and SDCCH messages. 23. A system as recited in claim 1, wherein said LMS is configured for passively monitoring said set of predefined links such that the operation of said wireless device and said wireless communications system is unaffected by said monitoring. 24. A system as recited in claim 1, wherein said system is incorporated into a wireless location system (WLS), and said WLS is overlaid on said wireless communications system. 25. A system as recited in claim 1, further comprising a radio network monitor (RNM) and a mechanism for using cell ID or cell global identity (CGI) information to locate the mobile device. 26. A system as recited in claim 25, further comprising a mechanism for using CGI plus Timing Advance (CGI+TA) information to locate the mobile device. 27. A system as recited in claim 26, further comprising a mechanism for using an NMR in combination with enhanced cell ID (ECID, or CGI+TA+NMR) information to locate the mobile device. 28. A system as recited in claim 1, wherein said system is configured to employ a mapping of a serving cell-ID, serving sector, or a combination of serving cell, sector and handover candidate measurements as contained in an NMR. 29. A system as recited in claim 1, wherein said system is configured to detect at least one predefined network transaction occurring on at least one signaling link. 30. A system as recited in claim 29, wherein said at least one predefined network transaction comprises a Location Update transaction. 31. A system as recited in claim 29, wherein said at least one predefined network transaction comprises an Identity Request transaction. 32. A system as recited in claim 29, wherein said at least one predefined network transaction comprises a Network Measurement transaction. 33. A system as recited in claim 29, wherein said at least one predefined network transaction comprises a mobile-originated short message service (SMS) transaction. 34. A system as recited in claim 29, wherein said at least one predefined network transaction comprises a mobile-terminated short message service (SMS) transaction. 35. A system as recited in claim 29, wherein said at least one predefined network transaction comprises a mobile origination transaction. 36. A system as recited in claim 29, wherein said at least one predefined network transaction comprises a mobile termination transaction. 37. A system as recited in claim 29, wherein said at least one predefined network transaction comprises a Release transaction. 38. A system as recited in claim 1, wherein said system is configured to perform said detecting while said mobile device is idle and crossing a Location Area boundary and thereby causing an automatic Location Update transaction. 39. A system as recited in claim 1, wherein said system is configured to perform said detecting while said mobile device is on a voice call. 40. A system as recited in claim 1, wherein said system is configured to perform said detecting while said mobile device is on a data call. 41. A system as recited in claim 1, wherein the system is configured to define a dynamic geo-fenced area by making a change to a cell's location area code (LAC) and thereby provoking an idle mobile device to transmit and thus create a low-accuracy, cell ID-based location estimate. 42. A system as recited in claim 41, wherein the system is configured to use a dynamic process for detecting a mobile device, said process comprising: initially setting an original LAC in the BCCH for all of a plurality of cells; changing the LAC in a selected subset of said plurality of cells; setting triggers for location update transactions; and when an idle mobile device in the geo-fenced area detects the new LAC broadcast in the BCCH and initiates a location update transaction, detecting the location update transaction. 43. A system as recited in claim 1, wherein the system is configured to define a dynamic geo-fenced area by making a change to a cell's LAC and thereby provoking a mobile device currently on a call to experience a handoff or be released but allowed to redial and resume the call. 44. A system as recited in claim 43, wherein the system is configured to use a dynamic process for detecting a mobile device, said process comprising: initially setting an original LAC in the BCCH for all of a plurality of cells; changing the LAC in a selected subset of said plurality of cells; setting triggers for location update transactions; and when an idle mobile device in the geo-fenced area detects the new LAC broadcast in the BCCH and initiates a location update transaction, detecting the location update transaction. 45. A system as recited in claim 1, wherein the system is configured to query a Home Location Register (HLR) of the wireless communications system for identity information concerning at least one mobile device to be located, to issue an Any Time Interrogation (ATI) message to a Mobile Switching Center (MSC) to cause the at least one mobile device to transmit a Page Response message, and to use said Page Response message as a trigger to locate the at least one mobile device. 46. A system as recited in claim 1, wherein the LMS is incorporated into the wireless communications system.