Method and apparatus for using advanced positioning systems in cellular communications networks

• US 5,983,109 A
• Filed: 02/03/1997
• Issued: 11/09/1999
• Est. Priority Date: 02/03/1997
• Status: Expired due to Term

• Current Assignee: Hanger Solutions, LLC (IP Investments Group LLC)
• Original Assignee: Northern Telecom Limited (Nortel Networks Corporation)
• Inventors: Montoya, Alexander John
• Primary Examiner(s): TROST IV, WILLIAM GEORGE
• Application Number:
  US08/792,771
• Time in Patent Office: 1,009 Days
• Field of Search: 455/403, 455/404, 455/456, 455/567, 455/435, 455/426, 455/458, 455/422
• US Class Current: 455/456.2
• CPC Class Codes: G01S 19/42 Determining position
• CPC Class Codes: G01S 2205/002 for traffic control, mobile tracking, guidance, surveillance or anti-collision
• CPC Class Codes: G01S 2205/008 using a mobile telephone network
• CPC Class Codes: G01S 5/0027 of actual mobile position, i.e. position determined on mobile
• CPC Class Codes: H04B 7/18552 using a telephonic control signal and a second ranging satellite determining absolute distances from a plurality of spaced points of known location G01S5/14
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like

Abstract

A system and method that uses an advanced positioning system in combination with a cellular communication network to improve the performance of the network is disclosed One embodiment of the network includes a mobile switching center (MSC), a location tracker system (LTS), and a plurality of base stations for serving at least one mobile unit in the network. The LTS is able to receive a location code from the mobile unit that represents a specific coordinate, or location, in the network. The mobile unit may have generated the location code by analyzing its position from a global positioning satellite, or by other means. The LTS stores the location code in a data base. Whenever the MSC needs to communicate with the mobile unit, it queries the database of the LTS to determine the last location of the mobile unit. The MSC then selects one of the base stations that serves the location of the mobile unit and establishes a cellular link therethrough.

Claims

1. A method of providing location information of a mobile unit for use by a mobile switching center of a cellular communication network, the method comprising the mobile unit receiving a position signal from an advanced positioning system, determining a geographic location of the mobile unit, transmitting a location code that represents the geographic location to a location tracking system ("LTS"), which stores the transmitted location code in a database and forwards the location code to the mobile switching center responsive to a request by the mobile switching center for the location code;

and

transmitting to the LTS and forwarding to the mobile switching center a technology code with the location code.

2. The method of claim 1 wherein the receiving, determining and transmitting are repeated at predetermined time intervals.

3. The method of claim 1 wherein the position signal is a global positioning satellite ("G.P.S.") signal.

4. The method of claim 1 wherein the position signal is generated by one or more base stations of the cellular communication network.

5. The method of claim 1 further comprising transmitting to the LTS and forwarding to the mobile switching center an identification code identifying the mobile unit.

6. The method of claim 1 wherein the location code can be received by a base station connected to the mobile switching center.

7. In a cellular communication network, a mobile switching center linked to a plurality of base stations, and a location tracking system also linked to the plurality of base stations and to said mobile switching center, wherein the location tracking system comprises a database for storing a location code received from one or more mobile units in the cellular communication network;

and responsive to a request from the mobile switching center, the location tracking system transmits to the mobile switching center the location code for use by the mobile switching center in selecting one of the base stations for communicating with the mobile unit wherein the database stores a technology code received with the location code from one or more mobile units in the cellular communication network.

8. The mobile switching center of claim 7 further comprising an error log for recording errors that occur in the cellular communication network and an analyzer for comparing the errors with the database.

9. An apparatus for providing location information for use by a cellular communication network, the apparatus comprising means for receiving a position signal, means for determining a location of the apparatus, means for transmitting the location to a location tracking system, the location tracking system storing the transmitted location in a database of the location tracking system, wherein, responsive to a request by a mobile switching center of the cellular communication network the location tracking system forwards the location to the mobile switching center wherein said means for transmitting further comprises means for transmitting to the location tracking system a technology code with the location.

10. The apparatus of claim 9 wherein the apparatus repeatedly receives position signals, updates its location determination, and transmits the updated location to the location tracking system.

11. The apparatus of claim 9 wherein the position signal is a global positioning satellite ("GPS") signal.

12. The apparatus of claim 9 wherein the position signal is generated by one or more base stations of the cellular communication network.

13. The apparatus of claim 9 wherein the means for transmitting also transmits an identification code for the mobile unit.

14. The apparatus of claim 9 wherein the means for transmitting the location utilizes a base station connected to the mobile switching center.