System and method for extraction of location related data in a wireless communication system

• US 8,781,503 B2
• Filed: 03/11/2008
• Issued: 07/15/2014
• Est. Priority Date: 03/11/2008
• Status: Expired due to Fees

• Current Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Original Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Inventors: Ferguson, Jeffrey D.
• Primary Examiner(s): LEE, JUSTIN YE
• Application Number:
  US12/046,296
• Publication Number:
  US 20090233625A1
• Time in Patent Office: 2,317 Days
• Field of Search: 455/456.5, 455/414.1, 455/456.1, 455/456.3
• US Class Current: 455/456.5
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 92/12 between access points and access point controllers

Abstract

A system and method to collect data related to the geographical location of a mobile station communicating with a GSM network and to use the location related data to determine the geographical location of the mobile station. A tap is place in an Abis link between a base station and a base station controller, the tap providing a copy of a signal carried by the Abis link. The copy signal is routed to a protocol analyzer that extracts location related data from the copy signal. A location processor uses the location data to determine the geographical location of the mobile station. The geographical location data is used by a data analyzer to provide location based services, such as estimating traffic intensity and speed of mobile stations.

Claims

1. A system to provide location-based services for a mobile station in communication with a base station, the base station communicating with a base station controller via a communication link, comprising:

a protocol analyzer for extracting data from a copy of a signal provided by a tap on the communication link between the base station and the base station controller, the extracted data related to a location of the mobile station, wherein the extracted data includes contents of one or more specific data fields in the copy of the signal, and wherein the protocol analyzer further comprises one or more probes, each probe configured to filter out the contents of a specific data field in the copy of the signal; and

a location processor for receiving the extracted data and deriving location data therefrom, the location data being indicative of the location of the mobile station, wherein the extracted data comprises received signal strength indication measurement sets related to the location of the mobile station associated with the base station, each set including received signal strength indications measured by the mobile station of control signals from base stations within range of the mobile station, and wherein the location processor derives location data from the extracted data by;

comparing one of the received signal strength indication measurement sets with a database of predetermined received signal strength indication measurement sets associated with geographical location data and selecting as the derived location data the geographical location data associated with the predetermined received signal strength indication measurement set that most closely matches the one received signal strength indication measurement set;

or

determining distances from the mobile station to base stations within range of the mobile station using one of the received signal strength indication measurement sets and an algorithm based on a radio frequency propagation model and determining the derived location data by triangulation using the determined distances and data relating to the geographical locations of the base stations.

2. The system of claim 1 wherein the tap is a physical tap of the communication link for providing the copy of the signal by splitting the signal.

3. The system of claim 1 wherein the tap is a digital cross connect for receiving the signal, regenerating the signal, and generating the copy of the signal.

4. The system of claim 1 wherein the communication link is constructed in conformance with an industry standard for an Abis interface.

5. The system of claim 1 wherein the communication link is an electrical link, the signal is an electrical signal and the tap is an electrical tap.

6. The system of claim 1 wherein the communication link is an optical link, signal is an optical signal and the tap is an optical tap.

7. The system of claim 1 wherein the extracted data comprises Global Positioning System (GPS) data related to the location of the mobile station associated with the base station.

8. The system of claim 1, further comprising a data analyzer for processing the location data and providing location based services.

9. The system of claim 8 wherein the data analyzer performs statistical modeling of vehicular traffic through a geographic area covered by the base station, the modeling based on the derived mobile station location data.

10. The system of claim 1 wherein the extracted data comprises Global Positioning System (GPS) data related to the location of the mobile station associated with the base station.

11. A method to provide location-based services for a mobile station in communication with a base station, the base station communicating with a base station controller via a communication link, comprising:

extracting data from a copy of a signal provided by a tap on the communication link between the base station and the base station controller, the data extracted related to a location of the mobile station, and deriving location data therefrom, wherein extracting data from the copy of the signal comprises identifying one or more data fields in the copy of the signal, the data fields containing contents related to the location of the mobile station and extracting the contents of one or more identified data fields, wherein the extracted data comprises received signal strength indication measurement sets related to the location of the mobile station associated with the base station, each set including the received signal strength indications measured by the mobile station of control signals from base stations within range of the mobile station, and wherein deriving location data from the extracted data comprises;

comparing one of the received signal strength indication measurement sets with a database of predetermined received signal strength indication measurement sets associated with geographical location data and selecting as the derived location data the geographical location data associated with the predetermined received signal strength indication measurement set that most closely matches the one received signal strength indication measurement set;

or

determining distances from the mobile station to base stations within range of the mobile station using one of the received signal strength indication measurement sets and an algorithm based on a radio frequency propagation model and determining the derived location data by triangulation using the determined distances and data relating to the geographical locations of the base stations.

12. The method of claim 11 wherein the copy of the signal is provided by the tap physically splitting the signal into at least two portions including the copy of the signal and a continuing portion of the signal.

13. The method of claim 11 wherein the copy of the signal is provided by the tap:

receiving the signal;

regenerating the signal; and

generating the copy of the signal.

14. The method of claim 13 wherein generating the copy of the signal comprises:

analyzing the signal into component channels;

excluding channels from the copy of the signal, the excluded channels not containing information related to the location of the mobile station.

15. The method of claim 11 further comprising providing location based services using the location data.