DE69223405D1 - Positionsbestimmungssystem auf Abstand - Google Patents

Positionsbestimmungssystem auf Abstand

Info

Publication number
DE69223405D1
DE69223405D1 DE69223405T DE69223405T DE69223405D1 DE 69223405 D1 DE69223405 D1 DE 69223405D1 DE 69223405 T DE69223405 T DE 69223405T DE 69223405 T DE69223405 T DE 69223405T DE 69223405 D1 DE69223405 D1 DE 69223405D1
Authority
DE
Germany
Prior art keywords
frequency
timing signals
mobile
transmitter
base 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.)
Expired - Fee Related
Application number
DE69223405T
Other languages
English (en)
Other versions
DE69223405T2 (de
Inventor
Hanoch Yokev
Haim Harel
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.)
Nexus Telecommunication Systems Ltd
Original Assignee
Nexus Telecommunication Systems Ltd
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
Priority claimed from US07/961,776 external-priority patent/US5335246A/en
Application filed by Nexus Telecommunication Systems Ltd filed Critical Nexus Telecommunication Systems Ltd
Publication of DE69223405D1 publication Critical patent/DE69223405D1/de
Application granted granted Critical
Publication of DE69223405T2 publication Critical patent/DE69223405T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/713Spread spectrum techniques using frequency hopping
    • H04B1/7156Arrangements for sequence synchronisation
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S1/00Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/022Means for monitoring or calibrating
    • G01S1/026Means for monitoring or calibrating of associated receivers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S3/00Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02Direction-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
    • G01S3/023Monitoring or calibrating
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S3/00Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02Direction-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
    • G01S3/04Details
    • G01S3/043Receivers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S3/00Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02Direction-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
    • G01S3/04Details
    • G01S3/10Means for reducing or compensating for quadrantal, site, or like errors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/0009Transmission of position information to remote stations
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-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
    • G01S5/0205Details
    • G01S5/021Calibration, monitoring or correction
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO 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
    • G01S5/00Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02Position-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
    • G01S5/04Position of source determined by a plurality of spaced direction-finders
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/713Spread spectrum techniques using frequency hopping
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662Arrangements for Wireless System Synchronisation
    • H04B7/2671Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678Time synchronisation
    • H04B7/2681Synchronisation of a mobile station with one base station
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662Arrangements for Wireless System Synchronisation
    • H04B7/2671Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678Time synchronisation
    • H04B7/2687Inter base stations synchronisation
    • H04B7/2693Centralised synchronisation, i.e. using external universal time reference, e.g. by using a global positioning system [GPS] or by distributing time reference over the wireline network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W64/00Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • H04W88/022Selective call receivers
DE69223405T 1992-08-20 1992-12-30 Positionsbestimmungssystem auf Abstand Expired - Fee Related DE69223405T2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US93261092A 1992-08-20 1992-08-20
US07/961,776 US5335246A (en) 1992-08-20 1992-10-15 Pager with reverse paging facility

Publications (2)

Publication Number Publication Date
DE69223405D1 true DE69223405D1 (de) 1998-01-15
DE69223405T2 DE69223405T2 (de) 1998-04-23

Family

ID=25462595

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69223405T Expired - Fee Related DE69223405T2 (de) 1992-08-20 1992-12-30 Positionsbestimmungssystem auf Abstand

Country Status (5)

Country Link
US (1) US5379047A (de)
EP (2) EP0583523A3 (de)
AT (1) ATE160882T1 (de)
DE (1) DE69223405T2 (de)
IL (1) IL104264A (de)

Families Citing this family (68)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5430759A (en) * 1992-08-20 1995-07-04 Nexus 1994 Limited Low-power frequency-hopped spread spectrum reverse paging system
US5592180A (en) * 1992-08-20 1997-01-07 Nexus1994 Limited Direction finding and mobile location system for trunked mobile radio systems
US5583517A (en) * 1992-08-20 1996-12-10 Nexus 1994 Limited Multi-path resistant frequency-hopped spread spectrum mobile location system
US5596330A (en) * 1992-10-15 1997-01-21 Nexus Telecommunication Systems Ltd. Differential ranging for a frequency-hopped remote position determination system
US7917145B2 (en) * 1992-11-02 2011-03-29 Broadcom Corporation Radio frequency local area network
WO1995000821A1 (en) * 1993-06-25 1995-01-05 Omniplex, Inc. Determination of location using time-synchronized cell site transmissions
US5530452A (en) * 1993-10-21 1996-06-25 Nexus Telecommunication Systems Ltd. Method of synchronizing spread spectrum radio transmitters
IL107461A (en) * 1993-11-01 1997-04-15 Tadiran Ltd Personal location and message system and unit
JP3136076B2 (ja) * 1994-06-08 2001-02-19 キヤノン株式会社 符号分割多重変復調装置
US5903618A (en) * 1995-07-18 1999-05-11 Casio Computer Co., Ltd. Multimode radio communication system
AU7396096A (en) 1995-10-09 1997-04-30 Precision Tracking, Inc. Improved gps receivers and garments containing gps receivers and methods for using these gps receivers
US5884214A (en) * 1996-09-06 1999-03-16 Snaptrack, Inc. GPS receiver and method for processing GPS signals
US6002363A (en) * 1996-03-08 1999-12-14 Snaptrack, Inc. Combined GPS positioning system and communications system utilizing shared circuitry
US5874914A (en) * 1995-10-09 1999-02-23 Snaptrack, Inc. GPS receiver utilizing a communication link
US5825327A (en) * 1996-03-08 1998-10-20 Snaptrack, Inc. GPS receivers and garments containing GPS receivers and methods for using these GPS receivers
AU7396596A (en) * 1995-10-09 1997-04-30 Precision Tracking, Inc. Method and apparatus for determining the location of an object which may have an obstructed view of the sky
EP1260830B1 (de) * 1995-10-09 2010-09-15 Snaptrack, Inc. GPS-Empfänger und Verfahren zur Verarbeitung von GPS-Signalen
US5831574A (en) * 1996-03-08 1998-11-03 Snaptrack, Inc. Method and apparatus for determining the location of an object which may have an obstructed view of the sky
US6208290B1 (en) 1996-03-08 2001-03-27 Snaptrack, Inc. GPS receiver utilizing a communication link
US6131067A (en) 1995-10-09 2000-10-10 Snaptrack, Inc. Client-server based remote locator device
US5841396A (en) * 1996-03-08 1998-11-24 Snaptrack, Inc. GPS receiver utilizing a communication link
US5883598A (en) * 1995-12-15 1999-03-16 Signatron Technology Corporation Position location system and method
US7358857B1 (en) 1996-03-27 2008-04-15 Symbol Technologies, Inc. Global positioning systems applications
GB9611425D0 (en) * 1996-05-31 1996-08-07 Tracker Network Uk Ltd Digital communications
GB2329290B (en) * 1996-05-31 2001-04-18 Tracker Network Method of transmitting and receiving data,system and receiver therefor
AU716647B2 (en) * 1996-07-04 2000-03-02 Cambridge Positioning Systems Limited Ambiguity resolution in MCPS
AUPO084596A0 (en) * 1996-07-04 1996-07-25 University Of Technology, Sydney Location and tracking system enhancements
US6185427B1 (en) 1996-09-06 2001-02-06 Snaptrack, Inc. Distributed satellite position system processing and application network
DE19645808B4 (de) * 1996-11-07 2005-12-15 Kiekert Ag Kraftfahrzeug mit einer Zentralverriegelungsanlage sowie mit einer Fernbetätigungsinstallation
US6968737B2 (en) * 1997-01-02 2005-11-29 Lucent Technologies Inc. Position determining system using transmitted position information
US5955986A (en) * 1997-11-20 1999-09-21 Eagle Eye Technologies, Inc. Low-power satellite-based geopositioning system
US6002342A (en) * 1997-11-21 1999-12-14 Motorola, Inc. Communication system and device having unit locating feature
US6243587B1 (en) 1997-12-10 2001-06-05 Ericsson Inc. Method and system for determining position of a mobile transmitter
US6061018A (en) 1998-05-05 2000-05-09 Snaptrack, Inc. Method and system for using altitude information in a satellite positioning system
US6133873A (en) * 1998-06-03 2000-10-17 Krasner; Norman F. Method and apparatus for adaptively processing GPS signals in a GPS receiver
US6236354B1 (en) 1998-07-02 2001-05-22 Snaptrack, Inc. Reducing satellite signal interference in a global positioning system receiver
US6434184B2 (en) * 1998-12-30 2002-08-13 International Business Machines Corporation Orthogonal frequency hopping using skip zones
US20040143392A1 (en) * 1999-07-12 2004-07-22 Skybitz, Inc. System and method for fast acquisition reporting using communication satellite range measurement
US8255149B2 (en) 1999-07-12 2012-08-28 Skybitz, Inc. System and method for dual-mode location determination
US6560536B1 (en) 1999-07-12 2003-05-06 Eagle-Eye, Inc. System and method for rapid telepositioning
JP4187377B2 (ja) 2000-02-23 2008-11-26 富士通株式会社 無線送受信機及び電波放射方向制御方法
WO2002013476A1 (en) 2000-08-09 2002-02-14 Skybitz, Inc. System and method for fast code phase and carrier frequency acquisition in gps receiver
AU2001288963A1 (en) * 2000-09-18 2002-04-02 Skybitz, Inc System and method for fast code phase and carrier frequency acquisition in gps receiver
US7024331B2 (en) * 2000-11-15 2006-04-04 Scientific Generics Limited Tag tracking
WO2002041029A1 (en) * 2000-11-15 2002-05-23 Racetrace Inc. Tag tracking
US6590534B1 (en) 2000-12-16 2003-07-08 Kroll Family Trust Electronic car locator
US7151790B1 (en) * 2001-09-28 2006-12-19 Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Industry Automatic signal extraction and analysis from time-frequency representation
US8010124B2 (en) * 2003-03-24 2011-08-30 Sony Ericsson Mobile Communications Ab Methods, systems and computer program products for providing location determination information to an assisted location service
US7321776B2 (en) * 2003-09-25 2008-01-22 Sony Ericsson Mobile Communications Ab Estimating GPS time at cellular terminals based on timing of information from base stations and satellites
US20050237959A1 (en) * 2004-04-26 2005-10-27 Christopher Osterloh Mobile automatic meter reading system and method
JP4123195B2 (ja) * 2004-06-22 2008-07-23 オムロン株式会社 タグ通信装置、タグ通信装置の制御方法、タグ通信制御プログラム、および、タグ通信管理システム
US7453956B2 (en) 2004-08-16 2008-11-18 Sony Ericsson Mobile Communications Ab Apparatus, methods and computer program products for signal acquisition using common demodulation templates
US7358897B2 (en) * 2004-08-16 2008-04-15 Sony Ericsson Mobile Communicatios Ab Apparatus, methods and computer program products for GPS signal acquisition using an adaptive search engine
US20060034354A1 (en) * 2004-08-16 2006-02-16 Camp William O Jr Apparatus, methods and computer program products for positioning system signal processing using parallel computational techniques
JP4509863B2 (ja) * 2005-05-27 2010-07-21 株式会社東芝 無線基地局と無線端末
US7535378B2 (en) * 2005-09-09 2009-05-19 Itron, Inc. RF meter reading system
US20080068262A1 (en) * 2006-08-25 2008-03-20 Peter Van Wyck Loomis Remote node providing GPS signal samples for GPS positioning over a communication network
US7589671B2 (en) * 2006-08-25 2009-09-15 Trimble Navigation Limited GPS node locator using an intermediate node location for determining location of a remote node
CA2674334A1 (en) * 2007-01-04 2008-07-17 Itron, Inc. Collecting utility data information and conducting reconfigurations, such as demand resets, in a utility metering system
US7719467B2 (en) 2007-03-08 2010-05-18 Trimble Navigation Limited Digital camera with GNSS picture location determination
US7551126B2 (en) * 2007-03-08 2009-06-23 Trimble Navigation Limited GNSS sample processor for determining the location of an event
US8494561B2 (en) 2007-05-30 2013-07-23 Trimble Ab Radio network list for vehicle control and real time position data
WO2009021664A1 (en) * 2007-08-15 2009-02-19 Baimos Technologies Gmbh Method and system for locating the sender of a frequency hopping radio signal
US20100026517A1 (en) * 2008-01-04 2010-02-04 Itron, Inc. Utility data collection and reconfigurations in a utility metering system
US8269650B2 (en) 2010-04-14 2012-09-18 Itron, Inc. Meter right sizing
US8576123B2 (en) 2010-06-29 2013-11-05 International Business Machines Corporation Method and system for vessel authentication and location validation
US10330769B1 (en) * 2016-06-06 2019-06-25 The Boeing Company Method and apparatus for geolocating emitters in a multi-emitter environment
EP3809526A1 (de) 2019-10-18 2021-04-21 Rohde & Schwarz GmbH & Co. KG Antennensystem und antennensteuerverfahren

Family Cites Families (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2706933A (en) * 1951-08-27 1955-04-26 Comm Res Inc Method of forming rod-like paper articles
US3223779A (en) * 1962-01-23 1965-12-14 Robertshaw Controls Co Combined frequency shift and phase shift keying
US3384822A (en) * 1964-03-21 1968-05-21 Nippon Electric Co Frequency-shift-keying phase-modulation code transmission system
US3447085A (en) * 1965-01-04 1969-05-27 Gen Dynamics Corp Synchronization of receiver time base in plural frequency differential phase shift system
NL6612935A (de) * 1966-09-14 1968-03-15
US3493866A (en) * 1968-06-13 1970-02-03 Sperry Rand Corp Frequency stepped phase shift keyed communication system
US4030033A (en) * 1975-06-13 1977-06-14 Lowell Technological Institute Research Foundation Method and apparatus for transmitting messages to and from remote locations
US4079378A (en) * 1977-02-28 1978-03-14 General Dynamics Corporation Coherent pulse radar system with time-shared frequency source
US4222115A (en) * 1978-03-13 1980-09-09 Purdue Research Foundation Spread spectrum apparatus for cellular mobile communication systems
US4267592A (en) * 1979-03-30 1981-05-12 Rockwell International Corporation Anti-jam radio
US4309703A (en) * 1979-12-28 1982-01-05 International Business Machines Corporation Segmented chirp waveform implemented radar system
US4403343A (en) * 1980-09-30 1983-09-06 Clarion Co., Ltd. Diversity receiver
FR2527871B1 (fr) * 1982-05-27 1986-04-11 Thomson Csf Systeme de radiocommunications, a sauts de frequence
US4578819A (en) * 1983-07-25 1986-03-25 Sony Corporation Space diversity receiver
US4698781A (en) * 1983-08-01 1987-10-06 Spymark, Incorporated Systems for determining distances to and locations of features on a golf course
US4665404A (en) * 1983-10-24 1987-05-12 Offshore Navigation, Inc. High frequency spread spectrum positioning system and method therefor
US4545059A (en) * 1984-03-27 1985-10-01 Rockwell International Corporation Antenna coupler system
DE3566338D1 (en) * 1984-06-14 1988-12-22 Airtech Ltd Improvements in multicoupler systems
GB2171576B (en) * 1985-02-04 1989-07-12 Mitel Telecom Ltd Spread spectrum leaky feeder communication system
US4740792A (en) * 1986-08-27 1988-04-26 Hughes Aircraft Company Vehicle location system
US4747122A (en) * 1986-10-27 1988-05-24 Mobile Communications Corporation Of America Mobile paging call back system and related method
US4811379A (en) * 1987-12-21 1989-03-07 Motorola, Inc. Speak back paging system
GB8814456D0 (en) * 1988-06-17 1988-08-17 Cleveland Innovative Technolog Road vehicle locating system
US5021794A (en) * 1989-08-15 1991-06-04 Lawrence Robert A Personal emergency locator system
FR2667949A3 (fr) * 1990-01-30 1992-04-17 Spinosi Pierre Systeme de reperage de localisation et d'identification de tout mobile terrestre, aerien ou maritime.
US5073900A (en) * 1990-03-19 1991-12-17 Mallinckrodt Albert J Integrated cellular communications system
US5142534A (en) * 1990-10-17 1992-08-25 O'neill Communications, Inc. Wireless integrated voice-data communication system
US5212831A (en) * 1990-11-28 1993-05-18 Bell Communications Research, Inc. Method and apparatus for autonomous adaptive frequency assignment in TDMA portable radio systems
US5222101A (en) * 1991-05-03 1993-06-22 Bell Communications Research Phase equalizer for TDMA portable radio systems
US5155742A (en) * 1991-05-03 1992-10-13 Bell Communications Research, Inc. Time dispersion equalizer receiver with a time-reversal structure for TDMA portable radio systems
US5235615A (en) * 1991-05-22 1993-08-10 Cylink Corporation Spread spectrum method
US5164958A (en) * 1991-05-22 1992-11-17 Cylink Corporation Spread spectrum cellular handoff method
US5239677A (en) * 1991-07-01 1993-08-24 Motorola, Inc. Method and apparatus for initiating communication on an assigned frequency
US5267261A (en) * 1992-03-05 1993-11-30 Qualcomm Incorporated Mobile station assisted soft handoff in a CDMA cellular communications system
US5226045A (en) * 1992-05-07 1993-07-06 Bell Communications Research, Inc. Method and apparatus for autonomous selective routing during radio access in TDMA portable radio systems
US5224121A (en) * 1992-06-04 1993-06-29 Motorola, Inc. Rolling synthesizer method for baseband slow frequency hopping

Also Published As

Publication number Publication date
EP0583522A3 (en) 1994-07-27
EP0583523A3 (en) 1994-07-27
IL104264A (en) 1996-07-23
EP0583522A2 (de) 1994-02-23
EP0583522B1 (de) 1997-12-03
ATE160882T1 (de) 1997-12-15
DE69223405T2 (de) 1998-04-23
US5379047A (en) 1995-01-03
EP0583523A2 (de) 1994-02-23

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8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee