CA2192579A1 - Method and apparatus for location finding in a cdma system - Google Patents

Method and apparatus for location finding in a cdma system

Info

Publication number
CA2192579A1
CA2192579A1 CA2192579A CA2192579A CA2192579A1 CA 2192579 A1 CA2192579 A1 CA 2192579A1 CA 2192579 A CA2192579 A CA 2192579A CA 2192579 A CA2192579 A CA 2192579A CA 2192579 A1 CA2192579 A1 CA 2192579A1
Authority
CA
Canada
Prior art keywords
subscriber
location
base
receiving
spreading sequence
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.)
Granted
Application number
CA2192579A
Other languages
French (fr)
Other versions
CA2192579C (en
Inventor
Amitava Ghosh
John Douglas Reed
Walter Joseph Rozanski, Jr.
Kevin Andrew Buford
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Google Technology Holdings LLC
Original Assignee
Amitava Ghosh
John Douglas Reed
Walter Joseph Rozanski, Jr.
Kevin Andrew Buford
Motorola, Inc.
Motorola Mobility, Inc.
Motorola Mobility Llc
Google Technology Holdings LLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Amitava Ghosh, John Douglas Reed, Walter Joseph Rozanski, Jr., Kevin Andrew Buford, Motorola, Inc., Motorola Mobility, Inc., Motorola Mobility Llc, Google Technology Holdings LLC filed Critical Amitava Ghosh
Publication of CA2192579A1 publication Critical patent/CA2192579A1/en
Application granted granted Critical
Publication of CA2192579C publication Critical patent/CA2192579C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • 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
    • G01S5/14—Determining absolute distances from a plurality of spaced points of known location
    • 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
    • G01S5/14—Determining absolute distances from a plurality of spaced points of known location
    • G01S5/145—Using a supplementary range measurement, e.g. based on pseudo-range measurements

Abstract

A method and apparatus for determining the location of a communication unit in a CDMA system includes in a first embodiment, sending a location request via a spread spectrum signal to the subscriber (140), and receiving in return a subscriber signal including a response message showing a receive time of a particular symbol of the base's spreading sequence and a transmit time of a particular symbol of the subscriber's spreading sequence. The base (130), along with other receiving base(s) (140), also receives a predetermined symbol of the subscriber spreading sequence, and each determines a respective receive time of the predetermined symbol. The received information is then processed, along with known base location and delay information, to determine the subscriber location. If insufficient number of bases are capable of communicating with the subscriber, for example due to high loading/interference, auxiliairy bases (121) are also provided for receiving from or transmitting to the subscriber.
CA002192579A 1995-05-08 1996-03-21 Method and apparatus for location finding in a cdma system Expired - Lifetime CA2192579C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/436,760 US5508708A (en) 1995-05-08 1995-05-08 Method and apparatus for location finding in a CDMA system
US08/436,760 1995-05-08
PCT/US1996/003797 WO1996035958A1 (en) 1995-05-08 1996-03-21 Method and apparatus for location finding in a cdma system

Publications (2)

Publication Number Publication Date
CA2192579A1 true CA2192579A1 (en) 1996-11-14
CA2192579C CA2192579C (en) 1999-09-07

Family

ID=23733723

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002192579A Expired - Lifetime CA2192579C (en) 1995-05-08 1996-03-21 Method and apparatus for location finding in a cdma system

Country Status (15)

Country Link
US (3) US5508708A (en)
JP (1) JP3254682B2 (en)
KR (1) KR100208647B1 (en)
CN (1) CN1097734C (en)
BR (1) BR9606340A (en)
CA (1) CA2192579C (en)
FI (1) FI115886B (en)
FR (1) FR2734108B1 (en)
GB (1) GB2304500B (en)
IL (1) IL117654A (en)
IT (1) IT1284380B1 (en)
PL (1) PL180276B1 (en)
RU (1) RU2127963C1 (en)
SE (1) SE517676C2 (en)
WO (1) WO1996035958A1 (en)

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