Method and system for locating a mobile station within a mobile telecommunications network

• US 6,055,434 A
• Filed: 02/11/1997
• Issued: 04/25/2000
• Est. Priority Date: 02/11/1997
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Seraj, Jila
• Primary Examiner(s): Bost, Dwayne D.
• Assistant Examiner(s): MAUNG, NAY AUNG
• Application Number:
  US08/798,956
• Time in Patent Office: 1,169 Days
• Field of Search: 455/404, 455/422, 455/432, 455/436, 455/445, 455/456, 455/457, 455/466, 342/450, 342/451, 342/457
• US Class Current: 455/456.1
• CPC Class Codes: G01S 2205/007 for management of a communication system
• CPC Class Codes: G01S 5/0045 Transmission from base station to mobile station G01S5/009 takes precedence

Abstract

A plurality of low powered beacons are selectively placed throughout a serving mobile telecommunications network without connecting the beacons and the telecommunications network therebetween. Each of the beacons independently transmits identification data uniquely identifying itself. An application module and a mapping table correlating each identification data with the location of the corresponding beacon are associated with the serving mobile telecommunications network. As a mobile station travels within the serving mobile telecommunications network, the mobile station receives the identification data broadcast by the closest beacon located thereto. In connection with a call connection, the mobile station then transmits the received identification data to the serving mobile telecommunications network. By determining the location of the identified beacon, the mobile telecommunications network then determines that the mobile station is located approximate thereto.

Claims

1. A system for locating a mobile station within a mobile telecommunications network, comprising:

a mobile telecommunications node for providing mobile service over a particular geographic area;

a plurality of beacons, each of said plurality of beacons having a known location and being selectively placed throughout said particular geographic area and broadcasting identification data identifying said beacon, wherein said plurality of beacons are not connected to said mobile telecommunications node;

a mobile station for effectuating a call connection with said mobile telecommunications network, said mobile station further comprising;

a receiver for receiving said identification data from at least a portion of said plurality of beacons; and

a transmitter for communicating said received identification data for certain plural ones of said plurality of beacons with the strongest received signal strength towards said mobile telecommunications node; and

an application module associated with said mobile telecommunications network and configured to determine the location of said mobile station as being approximate to the known locations of said certain plural ones of the plurality of beacons with the strongest received signal strength identified by the received identification data communicated from the mobile station.

2. The system of claim 1 further associated with a telecommunications terminal (TT) and wherein said transmitter associated with said mobile station transmits said identification data within a call setup signal requesting a call connection between said mobile station and said TT.

3. The system of claim 2 wherein said call setup signal comprises a Direct Transfer Application Part (DTAP) signal encapsulating said location data.

4. The system of claim 1 further comprising a control channel for communicating information between said mobile station and said mobile telecommunications node, and wherein said transmitter associated with said mobile station transmits said identification data using a packet signal transmitted over said control channel.

5. The system of claim 4 wherein said packet signal comprises a Short Message Service (SMS) signal transmitted over said control channel.

6. The system of claim 2 wherein said transmitter associated with said mobile station periodically transmits said location data during a call connection with the mobile telecommunications network.

7. A method for approximating a current location of a particular mobile station within a mobile telecommunications network, wherein a plurality of beacons having known locations are selectively located within geographic area covered by said mobile telecommunications network, each of said beacons independently broadcasting a signal without communicating with said mobile telecommunications node, said method comprising the steps of:

receiving radio signal broadcasts by a particular mobile station from at least a portion of said plurality of beacons located close to said mobile station, said radio signal broadcasts including identification data identifying each of said beacons;

transmitting a request for a call connection with a particular telecommunications terminal (TT) towards a serving mobile telecommunications node by said mobile station;

communicating at least the identification data for certain plural ones of said plurality of beacons with the strongest received signal strength from said mobile station to said telecommunications node in connection with said requested call connection;

periodically communicating said at least the identification data for certain plural ones of said plurality of beacons with the strongest received signal strength towards said telecommunications node during the call connection until instructed otherwise, and

processing the periodically communicated beacon identification data to identify the location of said mobile station as being approximate to the known locations of said certain plural ones of said plurality of beacons with the strongest received signal strength identified by said beacon identification data.

8. The method of claim 7 wherein said mobile station receives said identification data over a radio channel assigned for broadcasting said identification data from said plurality of beacons.

9. The method of claim 7 wherein said TT comprises a Public Safety Answering Point (PSAP) terminal.

10. The method of claim 7 wherein said step of communicating said identification data further comprises the step of including said identification data within a call setup request signal transmitted in connection with said call connection towards said TT.

11. The method of claim 7 wherein said step of communicating said identification data further comprises the step of communicating said identification data via an unstructured data message.

12. The method of claim 11 wherein said unstructured data message comprises a Short Message Service (SMS) message.

13. A mobile station for establishing a call connection within a mobile telecommunications network, said mobile telecommunications network providing mobile service for a particular geographic area wherein a plurality of independent beacons are selectively placed throughout said geographic area, each of said plurality of beacons broadcasting identification data uniquely identifying said beacon and said mobile telecommunications network includes an application module that determines the location of said mobile station as being approximate to the known locations of certain plural ones of the plurality of beacons with the strongest received signal strength identified by the received identification data communicated from said mobile station to said mobile telecommunications network, said mobile station comprising:

receiving means for receiving identification data from at least a portion of said plurality of beacons, including certain plural ones of said plurality of beacons with the strongest received signal strength, over a first radio communication channel;

transceiving means for establishing a call connection with a particular telecommunications terminal (TT) through said mobile telecommunications network over a second communication channel, wherein said transceiving means further transmits said received identification data from said certain plural ones of said plurality of beacons towards said mobile telecommunications network over said second communication channel in connection with said call connection; and

an application module associated with said transceiving means for periodically transmitting said received identification data towards said mobile telecommunications network over said second communications channel during the call connection.

14. The mobile station of claim 13 wherein said first and second communications channels comprise different time slots within a Time Division Multiple Access (TDMA) communications system.

15. The mobile station of claim 13 wherein said first and second communications channels comprise different frequencies within an analog radio communications system.

16. The mobile station of claim 13 wherein said transceiving means transmits said identification data towards said mobile telecommunications network by including said identification data within a call setup signal requesting said call connection towards said TT through said mobile telecommunications network.

17. The mobile station of claim 16 wherein said call setup signal comprises a Direct Transfer Application Part (DTAP) based call setup signal.

18. The mobile station of claim 13 wherein said identification data are transmitted towards said mobile telecommunications network by transmitting said identification data within an unstructured data message transmitted over a control channel.

19. The mobile station of claim 13 wherein said unstructured data message comprises a Short Message Service (SMS) message.