GB2359699A - locating a mobile station in a cellular telephone network - Google Patents
locating a mobile station in a cellular telephone network Download PDFInfo
- Publication number
- GB2359699A GB2359699A GB0004286A GB0004286A GB2359699A GB 2359699 A GB2359699 A GB 2359699A GB 0004286 A GB0004286 A GB 0004286A GB 0004286 A GB0004286 A GB 0004286A GB 2359699 A GB2359699 A GB 2359699A
- Authority
- GB
- United Kingdom
- Prior art keywords
- location
- btss
- transmission
- determining
- mobile station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/0009—Transmission of position information to remote stations
- G01S5/0072—Transmission between mobile stations, e.g. anti-collision systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0284—Relative positioning
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/10—Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements, e.g. omega or decca systems
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A cellular telephone system includes a first mobile station (MS) (16) adapted to determine its location via a satellite positioning system (18) eg GPS, a second MS (20) whose location is initially unknown, and at least three base transceiver stations (BTS) (10,12,14) at known locations. In order to determine the second mobile stations' location, the first MS (16) receives a transmission from each of the BTSs (10,12,14), and calculates a transmission time offset of each BTS. The second MS (20) then receives a second transmission from each of the BTSs (10,12,14), and determines its location from the calculated transmission time offsets and the measured time difference of arrival (TDOA) of at least two pairs of second transmissions, from the BTSs (10,12,14). The invention has the advantage of allowing a non - GPS - enabled mobile station (22) to determine its location with the assistance of measurements made by a GPS-enabled mobile station (16).
Description
2359699
TITLE OF THE INVENTIOIN-
Method and apparatus for locating a mobile station in a cellular telephone system.
FIELD OF THE INVENITIG-N-
The present invention relates to wireless commumication systems in general, and more particularly to methods and apparatus for locating a mobile station in a cellular telephone system.
BACKGROUND OF THE 2, -XTEI\-TION
Methods and apparatus for determining the location of a mobile station (MS) in a cellular telephone system are well known in the art- In one method, known as hyperbolic trilateration, at least three base transceiver stations (BTS) at known locations send transmissions to an MS whose location is to be determined- - The time of arrival (TOA) of each of the transmissions at the MS is noted according to the MS internal clock, and the time difference of arrival (TDOA) of transmissions from at least two different pairs of BTSs is calculated. Where the BTSs transmit in synchronicity, a hyperbola may be demarcated between each BTS pair by presenting multiple solutions for each transmission's time of flight (TOF). The intersection between two hyperbolae indicates the estimated location of the MS.
Where the BTSs transmit asynchronously, such as in a cellular telephone system based on the Global System for Mobile Communications (GSM), the hyperbolae may be demarcated once the BTS transmission time offisets are calculated by making TDOA measurements at a known position, such as via a Location -Measurement Unit (LMU) as is known for Enhanced Observed Time Differential (EOTD) systems. An LMU is typically located in a fixed position at a BTS site so that no separate site is needed for the LMU, thus 2 providing for ease of maintenance and lower real estate costs. Unfortunately, the proximity of an LMU to a BTS occasionally results in an LMU not "seeing" one or both of the other two BTSs needed in order to perform the TDOA measurements. This is due to adjacent channel interference from the BTS where the LMU is deployed.
The use of the Global Positioning System (GPS) to determine the position of an MS is also known in the art. However, the use of a GPS-enabled MS in urban areas often suffers from line-of-sight limitations as buildings and other obstructions block the GPS signals needed to provide a location fix. Thus, while one GPS-enabled MSs might be able to determine its location at given point in time using GPS signals, another GPS-enabled MS might not.
SUMMARY OF THE INVENTION
The present invention seeks to provide improved methods and apparatus for locating a mobile station in a cellular telephone system that overcome the disadvantages of the prior art.
Accordingly, in one aspect the present invention consists of a method of determining the location of a mobile station MS, including the steps of, receiving at a first MS at a known location a first transmission from each of a plurality of base transceiver stations BTSs, calculating a relative transmission time offset of each of the BTSs from the received transmissions at the first MS, receiving at a second MS a second transmission from each of the BTSs, measuring time difference of arrival (TDOA) of at least two pairs of the second transmissions at the second MS and determining the location of the second MS from the calculated relative time offsets and the TDOA measurements.
telephone system.
3 In accordance with a second aspect of the invention, apparatus for determining the location of a mobile station MS in a cellular telephone system comprises; means for receiving at a first MS at a known location a first transmission from each of a plurality of base transceiver stations (BTS), means for calculating a relative transmission time offset of each of the BTSs from the received transmissions at the first MS, means for receiving at a second MS a serpond transmission from each of the BTSs, and means for measuring time difference of arrival (TDOA) of at least two pairs of the second transmissions at the second MS and means for determining the location of the second MS from the calculated relative time offsets and the TDOA measurements In a third aspect, the present invention consists of a method of determining the location of a mobile station (MS) including the steps of., receiving at a first MS at a known location a first transmission from each of a plurablity of base transceiver stations BTSs, calculating a relative transmission time offset of each of the BTSs from the received transmissions at the first MS, receiving at each of the BTSs a second transmission from a second MS, measuring time difference of arrival (TDOA) of the second transmission at at least two pairs of the BTSs, and determining the location of the second MS from the calculated relative time offset and the TDOA measurements.
In a fourth aspect, the present invention, apparatus for determining the location of a mobile station (MS) in a cellular telephone system comprises means for receiving at a first MS at a known location a first transmission from each of a plurality of base transceiver stations BTSs, means for calculating a relative transmission time offset of each of the BTSs from the received transmissions at the first MS, means for receiving at each of the BTSs a second transmission from a second MS, means for measuring time difference of arrival 4 (TDOA) of the second transmission at at leaast two pairs of the BTSs, and means for determining the location of the second MS from the calculated relative time offset and the TDOA measurements.
In a fifth aspect; the present invention consists of a method of determining the location of a mobile station (MS) including the steps of., receiving at the MS at a first known location a first transmission from each of a plurality of base transceiver stations BTSs; calculating a relative transmission time offset of each of the BTSs from the received transmissions at the MS, receiving at the MS at a second location a second transmission from each of the BTSs, measuring time difference of arrival (TDOA) of at least two pairs of said second transmissions at the MS at the second location and determining the location of the MS at the second location from the calculated relative time offsets and the TDOA measurements.
In a sixth aspect of the present invention apparatus for determining the lcoation of a mobile station (MS) in a cellular telephone system comprises; means for receiving at the MS at a first known location a first transmission from each of a plurality of base transceiver stations, BTSs, means for calculating a relative transmission time offset of each of the BTSs from the received transmissions at the MS means for receiving at the MS at a second location a second transmission from each of the BTSs means for measuring time difference of arrival (TDOA) of at least two pairs of said second transmissions at the MS, at the second location and means for determining the location of the MS, at the second location from the calculated relative time offsets and the TDOA measurements.
The first MS may be provided with a satellite Global Positioning System (GPS) for determining its own location.
The mobile stations and BTSs may form part of a Global System for Mobile Communications (GSM) cellular telephone System.
Additionally in accordance with a preferred embodiment of the present invention any of the transmissions is a synchronization channel (SCH) transmission on a broadcast control channel (BCCH).
Moreover in accordance with a preferred embodiment of the present invention the determining step includes determining using hyperbolic trilateration.
The means for calculating or for determining may be located at a mobile station, a base transceiver station or at a remote control station.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be understood and appreciated more fully from the following detailed description taken in conjunction with the appended drawings in which:
Fig. 1 is a simplified diagrammatic flow illustration of a system for determining the location of a mobile station in a cellular telephone system, constructed and operative in accordance with a preferred embodiment of the present invention; Fig. 2 is a simplified flowchart illustration of a method of operation of the system of Fig. 1, operative in accordance with a preferred embodiment of the present invention; Fig. 3 is a simplified diagrammatic flow illustration of a system for determining the location of a mobile station in a cellular telephone system, constructed and operative in accordance with another preferred embodiment of the present invention; and Fig. 4 is a simplified flowchart illustration of a method of operation of the system of Fig. 3, operative in accordance with a preferred embodiment of the present invention.
6 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Reference is now made to Fig. 1 which is a simplified diagrammatic flow illustration of a system for determining the location of a mobile station in a cellular telephone system, constructed and operative in accordance with a preferred embodiment of the present invention, and additionally to Fig. 2 which is a simplified flowchart illustration of a preferred method of operation of the system of Fig. 1. In Fig. 1 three base transmission stations (BTS) 10, 12, and 14 of a cellular telephone system are shown, each having a known location. A mobile station (MS) 16 is shown within communications range of BTSs 10, 12, and 14 and is adapted for determining its location via a satellite positioning system, typically the Global Positioning System (GPS), represented by a satellite 18. It is appreciated that several satellites may be consulted to determine the location of MS 16 although only satellite 18 is shown for diagrammatic clarity. A second MS 20 is shown at a different location from that of MS 16 but still within communications range of BTSs 10, 12, and 14. For purposes of understanding the present invention MS 20 is either not adapted for determining its location via the satellite positioning system or, if it is so adapted, is currently unable to determine its location in this manner due to malfunction or obstruction of signals to and/or from the satellite positioning system.
In a typical operational scenario of the system of Fig. 1 MS 16 determines its location via satellite 18 (step 100) and receives asynchronouslytransmitted transmissions from each of BTSs 10, 12, and 14 (step 110). A transmission from BTSs 10, 12, and 14 may be a GSM transmission, such as a synchronization channel (SCH) transmission on the broadcast control channel (BCCH), or any other known type of transInlission that may be relied upon to provide the location of MS 16 in accordance with known techniques including, but not limited to, hyperbolic trilateration. The time of arrival (TOA) of each BTS 7 transmission at MS 16 is noted by MS 16 according to its internal clock, and the time difference of arrival (TDOA) between pairs of BTS transmissions is calculated (step 120).
Given the known locations of BTSs 10, 12, and 14, the current location of MS 16 as determined by MS 16 and satellite 18, the distances between MS 16 and BTSs 10, 12, and 14 may be calculated (step 130). From these distances the time of flight (TOF) of each transmission may be calculated (step 140) from which the BTS transmission times and transmission time offsets between BTSs may then be calculated (step 150). It is appreciated that any of these calculations may be performed by MS 16, any of BTSs 10, 12, and 14, or any suitable computation means associated therewith within the cellular communications system. TOAs may be communicated by MS 16 to the BTS currently serving MS 16 using the Short Message Service (SMS) or any known MS-to-BTS communications means.
Operation of the system of Fig. 1 continues with MS 20 receiving asynchronously-transmitted transmissions from each of BTSs 10, 12, and 14 at a location other than the location determined by MS 16 via satellite 18 (step 160). In accordance with the present invention, MS 20 does not ascertain its location using satellite positioning. Rather, the transmission time offsets calculated for BTSs 10, 12, and 14 based on transmissions received by MS 16 at a first location are used to determine the location of MS 20 at its current, different location, as the transmission time offsets between transmissions from BTSs 10, 12, and 14 vary gradually over time, if at all. The TD0As of BTS pairs are calculated for transmissions received at MS 20 (step 170) and, together with the previouslycalculated transmission time offsets and the known locations of the BTSs, the location of MS 20 may be determined using known means as described above (step 180).
It is appreciated that MS 16 and MS 20 may be the same MS for which measurements are taken at two different locations. In this manner earlier satellite-based 8 location measurements taken by MS 16 at a first location may be supplemented by hyperbolic trilateration or other non-satellite based location methods where the MS is unable to determine its location using satellite-based means at a second location.
It is further appreciated that the accuracy of transmission time offset measurements may be improved by averaging timing measurements from multiple GPSenabled MSs, thereby adjusting for multipath propagation, noise, interference, and other effects.
Reference is now made to Fig. 3 which is a simplified diagrammatic flow illustration of a system for determining the location of a mobile station in a cellular telephone system, constructed and operative in accordance with another preferred embodiment of the present invention, and additionally to Fig. 4 which is a simplified flowchart illustration of a preferred method of operation of the system of Fig. 3. In Fig. 3 the three base transmission stations (BTS) 10, 12, and 14 of a cellular telephone system are shown, each having a known location. Mobile station (MS) 16 is shown within communications range of BTSs 10, 12, and 14 and is adapted for determining its location via the satellite positioning system represented by a satellite 18.
A second MS 22 is shown at a different location from that of MS 16 but still within communications range of BTSs 10, 12, and 14. MS 22 is typically incapable of determining its own location by any means and of performing TOA measurements of transmissions from the BTSs. Normally, the location of MS 22 could be determined by instructing BTS 10, 12, and 14 to listen for a particular transmission from MS 22. The TOA of the transmission at each BTS would then be noted according to a common time reference, such as may be provided by a GPS-enabled receiver at each BTS or other BTS-wide clock synchronization 9 means. The TDOA could then be calculated between BTS pairs and hyperbolic trilateration performed.
In a typical operational scenario of the system of Fig. 3 MS 16 operates in a manner similar to that described hereinabove with reference to Figs. 1 and 2, determining its location via satellite 18 (step 400), receiving asynchronously-transmitted transmissions from each of BTSs 10, 12, and 14 (step 410), and measuring the TOA of each BTS transmission at MS 16, thereby allowing the time difference of arrival (TDOA) between pairs of BTS transmissions to be calculated (step 420). The distances between MS 16 and BTSs 10, 12, and 14 are then calculated (step 430), from which the time of flight (TOF) of each transmission (step 440) and, ultimately, the transmission time offsets between BTSs, are then calculated (step 450) using known techniques.
Given the known transmission time offsets of BTSs 10, 12, and 14, the BTSs are instructed to listen for a particular transmission from MS 22 (step 460). According to the present invention the TOA of the transmission at each BTS is not measured according to a common clock, but is instead measured in relation to the BTS's own transmission time offset as provided by MS 16, thus obviating the need for a GPS-enabled receiver at each BTS or other BTS-wide clock synchronization means. The TDOA is then calculated between BTS pairs (step 470) and hyperbolic trilateration performed to determine the position of MS 22 (step 480).
While the methods and apparatus disclosed herein may or may not have been described with reference to specific hardware or software, the methods and apparatus have been described in a manner sufficient to enable persons of ordinary skill in the art to readily adapt commercially available hardware and software as may be needed to reduce any of the embodiments of the present invention to practice without undue experimentation and using conventional techniques.
While the present invention has been described with reference to a few specific embodiments, the description is intended to be illustrative of the invention as a whole and is not to be construed as limiting the invention to the embodiments shown. It is appreciated that various modifications may occur to those skilled in the art that, while not specifically shown herein, are nevertheless within scope of the appended claims.
11
Claims (2)
1. A method of determining the location of a mobile station MS (20), including the steps of receiving (110) at a first MS (16) at a known location a first transmission from each of plurality of base transceiver stations BTSs (10,12,14); calculating (150) a relative transmission time offset of each of the BTSs (10,12,14) from the received transmissions at the first MS (16) receiving (160) at a second MS (20) a second transmission from each of the BTSs (10, 12,14); measuring (170) time difference of arrival (TDOA) of at least two pairs of the second transmissions at the second MS (20) and determining (180) the location of the second MS (20) from the calculated relative time offsets and the TDOA measurements.
2. Apparatus for determining the location of a mobile station MS (20) in a cellular telephone system comprising; means for receiving at a first MS (16) at a known location a first transmission from each of a plurality of base transceiver stations BTSs (10,12,14); means (16) for calculating a relative transmission time offset of each of the BTSs (10,12,14) from the received transmissions at the first MS (16); means for receiving at a second (20) MS a second location (20) a second transmission from each of said BTSs (10,12,14); means for measuring time difference of arrival (TDOA) of at least two pairs of said second transmissions at the second MS (20) and means for determining the location of the second MS from the calculated relative time offsets and the TDOA measurements.
A method of determining the location of a MS (16) including the steps of; receiving (410) at a MS (16) at a known location a first transmission from each of a plurablity of base transceiver stations BTSs (10,12,14); calculating (450) a relative transmission time offset of each of the BTSs (10,12,14) from the received transmissions at the first MS (16), receiving (460) at each of the BTSs (10,13,14) a second transmission from a 12 second MS (22) measuring (470) time difference of arrival (TDOA) of at least two pairs of the BTSs, and determining (480) the location of the second MS (22) from the calculated relative time offset and the TDOA measurements.
4 Apparatus for determining the location of a mobile station MS (16) in a cellular telephone system comprising; means (16) for receiving at a first MS (16) at a known location a first transmission from each of a plurality of base transceiver stations BTSs (10,12,14); means (16flor calculating a relative transmission time offset of each of the BTSs from the received transmissions at the first MS (16), means (10,12,14) for receiving at each of the BTSs a second transmission from a second MS (22), means (10, 12,14) for measuring time difference of arrival (TDOA) of the second transmission at at least two pairs of the BTSs (10,12,14), and means (10, 12,14) for determining the location of the second MS (22) from the calculated relative time offset and the TDOA measurements.
A method of determining the location of a mobile station MS (16) including the steps of receiving ( 110) at the MS (16), at a first known location a first transmission from each of a plurality of base transceiver stations BTSs (10,12,14); calculating (150) a relative transmission time offset of each of the BTSs from the received transmissions at the MS (16), receiving (160) at the MS(16) at a second location (20) a second transmission from each of the BTSs and measuring time difference of arrival (TDOA) of at least two pairs of said second transmissions at the MS (16) at the second location (20) and determining (180) the location of the MS at the second location (20) from the calculated relative time offsets and the TDOA measurements.
13 6 Apparatus for determining the location of a mobile station MS (16) in a cellular telephone system comprising: means (16) for receiving at a MS (16) at a first known location a first transmission from each of a plurality of base transceiver stations BTSs (10,12,14), means for calculating (16) a relative transmission time offset of each of the BTS s (10, 12,14) from the received transmissions at the first MS (16), means for receiving (16) at the MS (16) at a second location (20) a second transmission from each of the BTSs (10, 12,14) means for measuring the time difference of arrival (TDOA) of at least two pairs of said second transmissions at the MS (16) at said second location (20) and means for determing the location of the MS at the second location (20) from the calculated relative time offsets and the TDOA measurements.
7 Apparatus according to any of claims 2,4 or 6 wherein the first mobile station (16) is provided with a satellite Global Positioning System (GPS).
8 Apparatus according to any of claims 2,4,6 or 7 wherein the mobile stations (16,22) and BTSs (10, 12,14) form part of a GSM cellular telephone system.
9 A method according to any of claims 1,3 or 5 wherein any of said transmissions is a s ynchronization channel (SCH) transmission made on a broadcast control channel (BCCH).
A method according to any of claims 1,3,5 or 9 wherein said determining step comprises determining using hyperbolic trilateration.
11 A method of determining the location of a mobile station substantially as 14 hereinbefore described with reference to the drawings.
12 Apparatus for determining the location of a mobile station in a cellular telephone system substantially as hereinbefore described with reference to the drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0004286A GB2359699A (en) | 2000-02-23 | 2000-02-23 | locating a mobile station in a cellular telephone network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0004286A GB2359699A (en) | 2000-02-23 | 2000-02-23 | locating a mobile station in a cellular telephone network |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0004286D0 GB0004286D0 (en) | 2000-04-12 |
| GB2359699A true GB2359699A (en) | 2001-08-29 |
| GB2359699A8 GB2359699A8 (en) | 2001-09-24 |
Family
ID=9886254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0004286A Withdrawn GB2359699A (en) | 2000-02-23 | 2000-02-23 | locating a mobile station in a cellular telephone network |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2359699A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2386014A (en) * | 2002-03-01 | 2003-09-03 | Nec Technologies | Cellular location system using time of arrival to determine location of a mobile unit |
| WO2004008171A1 (en) * | 2002-07-15 | 2004-01-22 | Qualcomm Incorporated | Apparatus and method of position determination of a first mobile device using information from a second mobile device |
| GB2402825A (en) * | 2003-06-12 | 2004-12-15 | Anthony Michael O'doherty | Competitor monitor |
| GB2399244B (en) * | 2001-05-18 | 2005-07-13 | Southwest Res Inst | Passive GSM-Based self-locating device |
| EP1619921A1 (en) * | 2004-07-22 | 2006-01-25 | Bouygues Telecom | Method for localising a mobile terminal in a non-synchronized mobile network |
| WO2007103821A2 (en) * | 2006-03-02 | 2007-09-13 | Qualcomm Incorporated | Position determination with peer-to-peer communication |
| WO2008064745A1 (en) * | 2006-11-29 | 2008-06-05 | Rohde & Schwarz Gmbh & Co. Kg | Method and device for determination of the position of a terminal in a mobile communication network |
| WO2008080226A1 (en) * | 2006-12-28 | 2008-07-10 | Worldscout Corporation | System and method for determining the location of a location tracking device |
| WO2010040392A1 (en) * | 2008-10-07 | 2010-04-15 | Nokia Corporation | Upload and download of position reference data |
| WO2010040391A3 (en) * | 2008-10-07 | 2010-07-08 | Nokia Corporation | Upload and download of position reference data |
| EP2372386A1 (en) * | 2010-03-24 | 2011-10-05 | Xiaoyun Li | Method for distance estimation |
| US8457657B2 (en) | 2010-01-22 | 2013-06-04 | Qualcomm Incorporated | Method and apparatus for peer-assisted localization |
| US8644850B2 (en) | 2009-10-05 | 2014-02-04 | Bae Systems Plc | Radio navigation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2254508A (en) * | 1991-04-02 | 1992-10-07 | James Collier Mitchinson | Vehicle location determining system |
| WO1997023785A1 (en) * | 1995-12-22 | 1997-07-03 | University Of Technology, Sydney | Location and tracking system |
| WO1999011086A1 (en) * | 1997-08-23 | 1999-03-04 | Cambridge Positioning Systems Ltd. | Location system for digital mobile telephony |
-
2000
- 2000-02-23 GB GB0004286A patent/GB2359699A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2254508A (en) * | 1991-04-02 | 1992-10-07 | James Collier Mitchinson | Vehicle location determining system |
| WO1997023785A1 (en) * | 1995-12-22 | 1997-07-03 | University Of Technology, Sydney | Location and tracking system |
| WO1999011086A1 (en) * | 1997-08-23 | 1999-03-04 | Cambridge Positioning Systems Ltd. | Location system for digital mobile telephony |
Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2399244B (en) * | 2001-05-18 | 2005-07-13 | Southwest Res Inst | Passive GSM-Based self-locating device |
| US7363043B2 (en) | 2001-05-18 | 2008-04-22 | Southwest Research Institute | Passive GSM-based self-locating device |
| CN100420312C (en) * | 2002-03-01 | 2008-09-17 | 日本电气株式会社 | Improved positioning system and cellular communication network |
| US7089019B2 (en) | 2002-03-01 | 2006-08-08 | Nec Corporation | Location systems and cellular communication networks |
| GB2386014A (en) * | 2002-03-01 | 2003-09-03 | Nec Technologies | Cellular location system using time of arrival to determine location of a mobile unit |
| US7084809B2 (en) | 2002-07-15 | 2006-08-01 | Qualcomm, Incorporated | Apparatus and method of position determination using shared information |
| WO2004008171A1 (en) * | 2002-07-15 | 2004-01-22 | Qualcomm Incorporated | Apparatus and method of position determination of a first mobile device using information from a second mobile device |
| CN1688892B (en) * | 2002-07-15 | 2010-08-25 | 高通股份有限公司 | Apparatus and method of position determination of a first mobile device using information from a second mobile device |
| GB2402825A (en) * | 2003-06-12 | 2004-12-15 | Anthony Michael O'doherty | Competitor monitor |
| GB2402825B (en) * | 2003-06-12 | 2007-02-14 | Anthony Michael O'doherty | Monitoring system and method |
| EP1619921A1 (en) * | 2004-07-22 | 2006-01-25 | Bouygues Telecom | Method for localising a mobile terminal in a non-synchronized mobile network |
| FR2873533A1 (en) * | 2004-07-22 | 2006-01-27 | Bouygues Telecom Sa | METHOD FOR LOCATING A MOBILE TERMINAL IN A NON-SYNCHRONIZED MOBILE NETWORK |
| WO2007103821A2 (en) * | 2006-03-02 | 2007-09-13 | Qualcomm Incorporated | Position determination with peer-to-peer communication |
| WO2007103821A3 (en) * | 2006-03-02 | 2007-10-25 | Qualcomm Inc | Position determination with peer-to-peer communication |
| US8369872B2 (en) | 2006-11-29 | 2013-02-05 | Rohde & Schwarz Gmbh & Co. Kg | Method and device for determination of the position of a terminal in a mobile communication network |
| JP2010511155A (en) * | 2006-11-29 | 2010-04-08 | ローデ ウント シュワルツ ゲーエムベーハー ウント コー カーゲー | Method, software and system for determining the position of a user device |
| WO2008064745A1 (en) * | 2006-11-29 | 2008-06-05 | Rohde & Schwarz Gmbh & Co. Kg | Method and device for determination of the position of a terminal in a mobile communication network |
| WO2008080226A1 (en) * | 2006-12-28 | 2008-07-10 | Worldscout Corporation | System and method for determining the location of a location tracking device |
| US8121609B2 (en) | 2006-12-28 | 2012-02-21 | Worldscout Corporation | System and method for determining the location of a location tracking device |
| WO2010040391A3 (en) * | 2008-10-07 | 2010-07-08 | Nokia Corporation | Upload and download of position reference data |
| WO2010040392A1 (en) * | 2008-10-07 | 2010-04-15 | Nokia Corporation | Upload and download of position reference data |
| US8515448B2 (en) | 2008-10-07 | 2013-08-20 | Nokia Corporation | Upload and download of position reference data |
| US8818400B2 (en) | 2008-10-07 | 2014-08-26 | Nokia Corporation | Upload and download of position reference data |
| US8644850B2 (en) | 2009-10-05 | 2014-02-04 | Bae Systems Plc | Radio navigation |
| US8963775B2 (en) | 2009-10-05 | 2015-02-24 | Bae Systems Plc | Tracking radio signal sources |
| US9261579B2 (en) | 2009-10-05 | 2016-02-16 | Bae Systems Plc | Radio positioning of a mobile receiver using a virtual positioning reference |
| US8457657B2 (en) | 2010-01-22 | 2013-06-04 | Qualcomm Incorporated | Method and apparatus for peer-assisted localization |
| EP2372386A1 (en) * | 2010-03-24 | 2011-10-05 | Xiaoyun Li | Method for distance estimation |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0004286D0 (en) | 2000-04-12 |
| GB2359699A8 (en) | 2001-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhao | Standardization of mobile phone positioning for 3G systems | |
| JP5791968B2 (en) | Method and apparatus for determining position using a small number of GPS satellites and synchronous and asynchronous base stations | |
| US7171225B2 (en) | Methods and apparatuses for using mobile GPS receivers to synchronize basestations in cellular networks | |
| KR100660257B1 (en) | System and method for determining the location of a wireless CDM transceiver | |
| EP1897399B1 (en) | Method and apparatus for determining whether a mobile terminal has moved outside a given locale | |
| US8050687B2 (en) | Location systems and methods | |
| EP2167987B1 (en) | Facilitating mobile station location using a ground-based cellular network | |
| US20070252761A1 (en) | Method and arrangement for base station location, base station synchronization, and mobile station location | |
| AU756930B2 (en) | Method and system for locating a mobile subscriber in a CDMA communication system | |
| NZ544549A (en) | A method and apparatus for finding a mobile radio terminal | |
| KR20000062203A (en) | Local positioning system | |
| Kos et al. | Mobile user positioning in GSM/UMTS cellular networks | |
| JP4068149B2 (en) | Method for using signals with increased power to determine the location of a mobile subscriber in a CDMA cellular telephone system | |
| US7403155B2 (en) | Method for the accelerated acquisition of satellite signals | |
| GB2359699A (en) | locating a mobile station in a cellular telephone network | |
| KR100881869B1 (en) | Method and apparatus for using mobile GPS stations to synchronize base stations | |
| KR100379435B1 (en) | Method for measuring position of user equipment Radio Mobile Commuination System | |
| KR20050088594A (en) | The method for recognition of repeater area of mobile phone in network-based location service | |
| KR101100637B1 (en) | Determining the Location of Mobile Stations in a Building | |
| Jayant et al. | 3G Mobile phones positioning systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |