Radio access point device location verification based on wireless user device roaming history

• US 8,644,818 B1
• Filed: 10/14/2010
• Issued: 02/04/2014
• Est. Priority Date: 10/14/2010
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Okmyanskiy, Anton, Antoline, Jeffrey
• Primary Examiner(s): Zewdu, Meless N
• Assistant Examiner(s): Chang, Jean
• Application Number:
  US12/904,592
• Time in Patent Office: 1,209 Days
• Field of Search: 455/432.1, 455/456.6, 455/436, 455/426.1, 370/230.1, 370/331, 370/230
• US Class Current: 455/432.1
• CPC Class Codes: H04W 24/04 Arrangements for maintaining operational condition
• CPC Class Codes: H04W 64/003 locating network equipment
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Techniques are provided to detect when a radio access point device in a wireless cellular communication network is operating at a location other than its expected location. Roaming history data is obtained for wireless user devices in a wireless cellular communication network with respect to base transceiver stations each configured to serve a corresponding coverage area at a fixed known location and with respect to radio access point devices each configured to serve a corresponding relatively smaller coverage area in the wireless cellular communication network than a macro base transceiver station. Radio access point devices are also readily movable from one location to another location. The roaming history data of wireless user devices is analyzed against expected locations of radio access point devices to determine when a radio access point device is operating at a location other than its expected location.

Claims

1. A method comprising:

obtaining roaming history data of wireless user devices in a wireless cellular communication network with respect to base transceiver stations each configured to serve a corresponding coverage area at a fixed known location and with respect to radio access point devices each configured to serve a corresponding relatively smaller coverage area in the wireless cellular communication network and which radio access point devices are readily movable from one location to another location, the roaming history data comprising;

location update information comprising local area code information associated with location areas of the wireless user devices relative to the base transceiver stations in the network; and

measurement record information comprising indications of frequencies of signals received by the user devices; and

analyzing the local area code information in the location update information and frequency information in the measurement record information of the roaming history data to determine a time between updates of the location update information and the measurement record information; and

determining that a radio access point device is operating at a location other than its expected location when the determined time indicates that the updates of the location update information and the measurement record information would not be possible unless the radio access point is operating at the location other than its expected location.

2. The method of claim 1, wherein analyzing comprises analyzing the roaming history data to determine when a wireless user device was registered for service with a first radio access point device and within a period of time registers for service at a macro base transceiver station whose known location is fixed and is sufficiently distant from the expected location of the first radio access point device such that it is not physically possible for the wireless user device to move between the expected location and the known location within the period of time.

3. The method of claim 1, wherein analyzing comprises analyzing the roaming history data to determine when a wireless user device registers for service with a first radio access point device and within an period of time registers for service with a second radio access point device whose known and verified location is sufficiently distant from the expected location of the first radio access point device such that it is not physically possible for the wireless user device to move between the expected location and the known location within the period of time.

4. The method of claim 1, wherein obtaining comprises obtaining location update records for location update requests sent by wireless user devices, each location update request containing a location area code detected by a wireless user device from signals received from base station transceivers, each location area code serving as a unique reference for a location of a wireless user device during a communication session in the wireless cellular communication network, and wherein analyzing further comprises analyzing the roaming history data to determine when a wireless user device was registered for service on a first radio access point device and within a period of time sends a location update request containing a location area code assigned to a location that is sufficiently distant from the expected location of the first radio access point device such that it is not physically possible for the wireless user device to move between the expected location and the location associated with the local area code contained in the location update request.

5. The method of claim 1, wherein analyzing comprises analyzing the roaming history data to determine when a wireless user device was registered for service with a first radio access point device and while registered for service with the first radio access point device sends a measurement report for a signal that the wireless user device detects from a base transceiver station whose known location is sufficiently distant from the expected location of the first radio access point device.

6. The method of claim 1, wherein analyzing comprises analyzing the roaming history data to determine when a wireless user device was registered for service with a base transceiver station at a known and verified location and while registered for service with the base transceiver station the wireless user device sends a measurement report for a signal that the wireless user device detects from a first radio access point device whose expected location is sufficiently distant from the known and verified location of the base transceiver station.

7. The method of claim 1, wherein obtaining comprises obtaining location update records comprising data identifying base transceiver stations on which wireless user devices registered for service, data indicating when the wireless user devices registered for service with base transceiver stations, data identifying radio access point devices on which wireless user devices registered for service, and data indicating when the wireless user devices registered for service with radio access point devices.

8. The method of claim 7, wherein obtaining location update records comprises obtaining cell identifiers as identifiers of base transceiver stations, and further comprising determining locations of respective base transceiver stations from corresponding cell identifiers.

9. The method of claim 7, wherein obtaining location update records comprises obtaining location area codes in location update reports generated from broadcast signals received by wireless user devices from base transceiver stations, and further comprising determining locations of respective base transceiver stations from corresponding location area codes contained in the location update records and information indicating which geographic areas are served by the location area codes.

10. The method of claim 1, wherein obtaining comprises obtaining measurement reports indicating measurements made by wireless user devices on signals received by wireless user devices from base transceiver stations and radio access point devices, the measurement reports indicating the base transceiver stations and radio access point devices on which measurements are made and times of the measurements.

11. The method of claim 10, and further comprising sending a message to a wireless user device that is currently served by a radio access point device, the message configured to instruct the wireless user device to scan a defined spectrum other than a spectrum that the wireless user device is normally configured to scan in order to detect signals from one or more base transceiver stations.

12. The method of claim 10, wherein obtaining measurement reports comprises obtaining data indicating a frequency of a signal received by a wireless user device a base transceiver station in a measurement report, and further comprising identifying a base transceiver station whose signal is used for the measurement report based on the data indicating the frequency based on the knowledge of which frequencies are used in geographic areas.

13. The method of claim 1, and further comprising generating a command to deactivate a radio access point device from service when it is determined that it is operating a location other than its expected location.

14. An apparatus comprising:

a network interface unit configured to enable communications over a network;

a processor configured to be coupled to the network interface unit, the processor configured to;

obtain roaming history data of wireless user devices in a wireless cellular communication network with respect to base transceiver stations each configured to serve a corresponding coverage area at a fixed known location and with respect to radio access point devices each configured to serve a corresponding relatively smaller coverage area in the wireless cellular communication network and which radio access point devices are readily movable from one location to another location the roaming history data comprising;

location update information comprising local area code information associated with location areas of the wireless user devices relative to the base transceiver stations in the network; and

measurement record information comprising indications of frequencies of signals received by the user devices; and

analyze the location area code information in the location update information and frequency information in the measurement record information of the roaming history data of wireless user devices to determine a time between updates of the location update information and the measurement record information; and

determine that a radio access point device is operating at a location other than its expected location when the determined time indicates that the updates of the location update information and the measurement record information would not be possible unless the radio access point is operating at the location other than its expected location.

15. The apparatus of claim 14, wherein the processor is configured to analyze by analyzing the roaming history data to determine when a wireless user device was registered for service with a first radio access point device and within a period of time registers for service at a macro base transceiver station whose known location is fixed and sufficiently distant from the expected location of the first radio access point device such that it is not physically possible for the wireless user device to move between the expected location and the known location within the period of time.

16. The apparatus of claim 14, wherein the processor is configured to analyze the roaming history data to determine when a wireless user device registers for service with a first radio access point device and within an period of time registers for service with a second radio access point device whose known and verified location is sufficiently distant from the expected location of the first radio access point device such that it is not physically possible for the wireless user device to move between the expected location and the known location within the period of time.

17. The apparatus of claim 14, wherein the processor is configured to obtain location update records for location update requests sent by wireless user devices, each location update recording comprising a location area code from broadcast signals received by wireless user devices from base station transceivers, each location area code serving as a unique reference for a location of a wireless user device during a communication session in the wireless cellular communication network, and to analyze the roaming history data to determine when a wireless user device was registered for service on a first radio access point device and within a period of time sends a location update request containing a location area code assigned to a location that is sufficiently distant from the expected location of the first radio access point device such that it is not physically possible for the wireless user device to move between the expected location and the location associated with the local area code contained in the location update request.

18. The apparatus of claim 14, wherein the processor is configured to analyze the roaming history data to determine when a wireless user device was registered for service with a first radio access point device and while registered for service with the first radio access point device sends a measurement report for a signal that the wireless user device detects from a base transceiver station whose known location is sufficiently distant from the expected location of the first radio access point device.

19. The apparatus of claim 14, wherein the processor is configured to analyze the roaming history data to determine when a wireless user device was registered for service with a base transceiver station at a known and verified location and while registered for service with the base transceiver station the wireless user device sends a measurement report for a signal that the wireless user device detects from a first radio access point device whose expected location is sufficiently distant from the known location of the base transceiver station.

20. A non-transitory computer readable medium storing instructions that, when executed by a processor, cause the processor to:

obtain roaming history data of wireless user devices in a wireless cellular communication network with respect to base transceiver stations each configured to serve a corresponding coverage area at a fixed known location and with respect to radio access point devices each configured to serve a corresponding relatively smaller coverage area in the wireless cellular communication network and which radio access point devices are readily movable from one location to another location, the roaming history data comprising;

location update information comprising local area code information associated with location areas of the wireless user devices relative to the base transceiver stations in the network; and

measurement record information comprising indications of frequencies of signals received by the user devices; and

analyze the location area code information in the location update information and frequency information in the measurement record information of the roaming history data to determine a time between updates of the location update information and the measurement record information; and

determine that, a radio access point device is operating at a location other than its expected location when the determined time indicates that the updates of the location update information and the measurement record information would not be possible unless the radio access point is operating at the location other than its expected location.

21. The computer readable medium of claim 20, wherein the instructions that cause the processor to analyze comprise instructions that cause the processor to analyze the roaming history data to determine when a wireless user device was registered for service with a first radio access point device and within a period of time registers for service at a macro base transceiver station whose known location is fixed and is sufficiently distant from the expected location of the first radio access point device such that it is not physically possible for the wireless user device to move between the expected location and the known location within the period of time.

22. The computer readable medium of claim 20, wherein the instructions that cause the processor to analyze comprise instructions that cause the processor to analyze the roaming history data to determine when a wireless user device registers for service with a first radio access point device and within an period of time registers for service with a second radio access point device whose known and verified location is sufficiently distant from the expected location of the first radio access point device such that it is not physically possible for the wireless user device to move between the expected location and the known location within the period of time.

23. The computer readable medium of claim 20, wherein the instructions that cause the processor to analyze comprise instructions that cause the processor to analyze the roaming history data to determine when a wireless user device was registered for service with a first radio access point device and while registered for service with the first radio access point device sends a measurement report for a signal that the wireless user device detects from a base transceiver station whose known location is sufficiently distant from the expected location of the first radio access point device.

24. The computer readable medium of claim 20, wherein the instructions that cause the processor to analyze comprise instructions that cause the processor to analyze the roaming history data to determine when a wireless user device was registered for service with a base transceiver station at a known and verified location and while registered for service with the base transceiver station the wireless user device sends a measurement report for a signal that the wireless user device detects from a first radio access point device whose expected location is sufficiently distant from the known location of the base transceiver station.