Mobile localization in gsm networks

• US 20050272439A1
• Filed: 12/23/2002
• Published: 12/08/2005
• Est. Priority Date: 12/21/2001
• Status: Abandoned Application

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Monguzzi, Giulio, Moretto, Maurizio, Picciriello, Agostino, Picciriello, Katia, Osterling, Jacob Kristian
• Application Number:
  US10/498,200
• Publication Number:
  US 20050272439A1
• Time in Patent Office: Days
• US Class Current: 455/456.100
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 16/28 using beam steering

Abstract

A positioning system and an antenna in a cellular mobile network, for operators that requires no modifications to standard phones and terminals used in said network and capable of using a range of different positioning methods, comprising one or several LMU systems that makes radio measurement (GSM and GPS)and transmit measurement data needed in the geographical positioning procedure of said phone or said terminal. Said LMU systems are composed of two parts a main box unit, comprising—measure receiver block—mobile station block (when an air interface is used)—main functionality and GPS block—digital signal block antenna unit, which can be placed in a remote position.

Claims

1. A positioning system in a cellular mobile network, comprising one or several Location Measurement Unit (LMU) systems that makes radio measurement (Global System for Mobile Communication (GSM) and Geosynchronous Positioning Satellite (GPS)) and transmit measurement data needed in the geographical positioning procedure of a phone or a terminal, wherein said LMU systems each comprise:

a main box unit, comprising as minimum

measure receiver block—

main functionality and GPS block and

digital signal block antenna unit, which can be placed in a remote position and;

an antenna unit, which can be placed in a remote position.

2. The positioning system of claim 1, wherein said antenna unit is a separate unit comprising;

a GSM antenna

a GPS antenna with LNA included

3. The positioning system of claim 1, wherein said GSM antenna is a adaptive antenna.

4. The positioning system of claim 3, wherein said adaptive antenna is a multi-beam antenna in order to improve the carrier to interference ratio (CIR) experienced at the LMU site of the received signal from the target BTS or to suppress reflections.

5. The Positioning system of claim 4, wherein said multi-beam antenna has dual polarisation with both spatial beams and polarisation beams.

6. The positioning system of claim 5, wherein said multi-beam antenna is a three sector patch antenna with polarity diversity for each path.

7. The positioning system of claim 6, wherein an antenna-beam is selected to one BTS and based on the radio environment of each BTS.

8. The positioning system of claim 7, wherein said antenna-beam is selected on prior knowledge of the radio environment.

9. The positioning system of claim 7, wherein said beam to use in said antenna unit is controlled by said main box unit.

10. The positioning system of claim 7, wherein said beam to use in said antenna unit is selected by means of a superimposed control word on a RF feeder between said antenna unit and said main box unit.

11. The positioning system of claim 9, wherein said main box unit receive a table of BTS co-ordinates from MPS and then predict or find correct antenna beam direction for one of the BTS in the list.

12. The positioning system of claim 7, wherein said antenna beam selection is based on prior measurements on the BTS.

13. The positioning system of claim 7, wherein a algorithm tries different beams at an installation procedure and then sticks to the best beam.

14. The positioning system of claim 13, wherein said beam is reselected at given instances to adapt to modified radio environments.

15. The positioning system of claim 1, wherein said GSM antenna is a tri-sector antenna in which each sector is individually selected by a switch while the remaining two are inactive.

16. The positioning system of claim 1, wherein the LMU deployment density is in the order of 1:

3 (1 LMU per 3 BTS sites) which permits to hear all cells(BTS s) with the required CIR.

17. The positioning system of claim 1, wherein said LMU is able to work in two modes.

18. The positioning system of claim 17, wherein said two modes comprise:

Mode A;

LMU exchanges data with the BTS by means of Um interface and communicates with SMPC via Over-The-Air (OTA) interface using SMS and is independent of the BTS implementation and is defined both for E-OTD and A-GPS and

Mode B;

LMU exchanges data with the BTS by means of LMU-RBS Data Interface and communicates with SMPC via BTS using CF-OML (Central Function Operation &

Maintenance Link)

19. The positioning system of claim 17, wherein said antenna unit is placed remote from the main box which is collocated with the base station in order to minimise interference.

20. The positioning system of claim 7, wherein information received on different beams, at different times, are combined to form the desired information about said BTS.

21. An antenna unit in a positioning system in a cellular mobile network, for operators that require no modifications to standard phones and terminals used in said network and capable of using a range of different positioning methods, comprising one or several LMU systems that makes radio measurement (GSM and GPS) and transmit measurement data needed in the geographical positioning procedure of said phone or said terminal, wherein said antenna is an adaptive antenna and situated in said LMU system.

22. The antenna of claim 21, wherein said adaptive antenna is a multi-beam antenna for improving the carrier to interference ratio (CIR) experienced at the LMU site of the received signal from the target BTS or to suppress reflections.

23. The antenna of claim 22, wherein said multi-beam antenna has dual polarisation with both spatial beams and polarisation beams.

24. The antenna of claim 22, wherein said multi-beam antenna is a three sector patch antenna with polarity diversity for each path.

25. The antenna of claim 24, wherein an antenna-beam is selected per GSM antenna is an adaptive antenna BTS and based on the radio environment of each BTS.

26. The antenna of claim 25, wherein said antenna-beam is selected on prior knowledge of the radio environment.

27. The antenna of claim 25, wherein said antenna beam selection is based on prior measurements on a BTS.

28. The antenna of claim 25, wherein an algorithm tries different beams at an installation procedure and then sticks to the best beam.

29. The antenna of claim 25, wherein said beam is reselected at given instances to adapt to modified radio environments.

30. The antenna of claim 21, wherein said antenna is a tri-sector antenna in which each sector is individually selected by a switch while the remaining two are inactive.

31. The antenna of claim 30, wherein information received on different beams, at different times, are combined to form the desired information about said BTS.

32. The antenna of claim 30, wherein more than one multi-beam antenna is connected in the system.

33. The antenna of claim 32, wherein said multi-beam antennas is serial connected.

34. The antenna of claim 32, wherein said antennas is connected in a star.

35. The antenna of claim 33, wherein said multi-beam antenna using a switch output dedicated for the serial antenna connection and just only one antenna unit has the GPS antenna.

36. The antenna of claim 33, wherein said multi-beam antenna receive a control word, for selection of a specific antenna beam, have a field to select the multi-beam antenna in the chain and another field to activate the requested beam.

37. The antenna of claim 34, wherein said connection have a distribution box, that allows connecting a set of multi-beam antennas in a star configuration, splitting the GSM signal.

38. The antenna of claim 34, wherein said multi-beam antenna receive a control word, for selection of a specific antenna beam, have one field to select the distribution box output and a second field to address the antenna beam and one of said antenna units has the GPS antenna.