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公开(公告)号：JP2001147262A
公开(公告)日：2001-05-29
申请号：JP2000304525
申请日：2000-10-04
Applicant: LUCENT TECHNOLOGIES INC
Inventor： TEKIN IBRAHIM , CHEN BYRON HUA , CHIANG TUNG CHING
Abstract: PROBLEM TO BE SOLVED: To provide a better system and method determining a wireless mobile unit 2 by using only a base station. SOLUTION: A position of the wireless mobile unit 2 is determined by a measurement value of the single base station. A distance between the wireless mobile unit 2 and base station is computed by using a round trip delay value of a RF up-link signal received from the wireless mobile unit 2. Then, an arrival angle of the received signal is determined as a measurement value received from each of a plurality of antenna sectors in a multi-sector antenna. The arrival angle is determined based on the antenna signal measurement value memorized of the multi-sector antenna, and a combination of discrete sector signal measurement values corresponds to a single angle measurement value. By using the determined distance and arrival angle, the position of the wireless mobile unit 2 is easily determined by using only the measurement value of the single base station.
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公开(公告)号：JP2001124842A
公开(公告)日：2001-05-11
申请号：JP2000268040
申请日：2000-09-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： TEKIN IBRAHIM , CHEN BYRON HUA , TSUN CHIN SHAN , DA REN
Abstract: PROBLEM TO BE SOLVED: To shorten the satellite searching time in a GPS system. SOLUTION: The integral time of a correlator is adjusted according to a signal strength measurement value of a satellite signal received by a GPS receiver. The integral value is adjusted proportionally; non-proportionally, or reversely to the received strength of a signal to be searched. In the implementation example, if received signal strength is more than a threshold value, an integral time is short (for example, 1 msec.). Contrarily, if received signal strength is lower than this threshold value, an integral time is long (for example, 1 sec.). For instance, the integral time is 1 sec. when a WAG client is in the interior and a satellite signal is weak, while the integral time is 1 msec. when the WGA client is in the outdoor and the satellite signal is strong. In this way, the integral time is dynamically regulated reversely according to the received signal strength of the satellite signal, so that the satellite signal can be easily detected without deteriorating detection system.
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公开(公告)号：BR0006781A
公开(公告)日：2001-07-24
申请号：BR0006781
申请日：2000-11-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BARROSO CHRISTOPHER BURKE , CHEN BYRON HUA , VANNUCCI GIOVANNI
IPC: G01C21/00 , G01S1/00 , G01S5/12 , G01S19/14 , G01S19/25 , G04G7/02 , H04B7/155 , H04Q7/22 , G01S1/04
Abstract: Disclosed is a method for deriving accurate global positioning satellite (GPS) timing by calibrating frame boundaries to GPS timing. Time calibration is achieved by determining a time, difference DELTA t between a reference GPS time (or pulse) and an nth frame boundary. The time difference DELTA t and a frame boundary identifier specifying the nth frame boundary are provided to a device equipped with a full or partial GPS receiver so that the GPS equipped device may synchronize itself to GPS timing. Upon synchronizing itself to GPS timing, the GPS equipped device may search for GPS signals using information provided by a geographical location server, e.g., WAG server.
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公开(公告)号：AU7190100A
公开(公告)日：2001-06-07
申请号：AU7190100
申请日：2000-11-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BARROSO CHRISTOPHER BURKE , CHEN BYRON HUA , VANNUCCI GIOVANNI
Abstract: Disclosed is a method for deriving accurate global positioning satellite (GPS) timing by calibrating frame boundaries to GPS timing. Time calibration is achieved by determining a time difference At between a reference GPS time (or pulse) and an nth frame boundary. The time difference At and a frame boundary identifier specifying the nth frame boundary are provided to a device equipped with a full or partial GPS receiver so that the GPS equipped device may synchronize itself to GPS timing. Upon synchronizing itself to GPS timing, the GPS equipped device may search for GPS signals using information provided by a geographical location server, e.g., WAG server.
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公开(公告)号：BR9903778A
公开(公告)日：2000-09-05
申请号：BR9903778
申请日：1999-08-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHEN BYRON HUA , FREIDENFELDS JOHN , CHIANG TUNG CHING
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Patent Agency Ranking
公开(公告)号：CA2288490A1
公开(公告)日：2000-06-16
申请号：CA2288490
申请日：1999-11-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHEN BYRON HUA , VARVARO CHARLES , PALAMARA MARIA E
Abstract: A local positioning system (LPS) uses the radio propagation parameters in a CDMA forward link or TDMA reverse link to establish a mobile station's position. The mobile station receives pilot channel signals from at least three distinct base stations and records the PN chip offset of the pilot channel signals. The LPS time difference of arrival triangulation approach requires no additional signal detection capabilities. Base stations send out pilot channel signals that arrive at a mobile station with a particular phase and at least a predetermined minimum strength. The mobile station reports back the "visible" pilot channel signals, their phases and signal strength to the LPS which uses a location non-linear system, expressed as a set of cost functions, to estimate the mobile location. The LPS can also solve the 9-1-1 mobile location problem for wireless CDMA systems by determining the position of a person in distress that has a digital cellular phone.
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公开(公告)号：CA2337300A1
公开(公告)日：2001-09-30
申请号：CA2337300
申请日：2001-02-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DA REN , CHEN BYRON HUA , TEKIN IBRAHIM
Abstract: Weighted ridge regression (WRR) processing is applied to three or more distance measurements to determine the location of a terminal. For example, in an integrated satellite-based navigation system / wireless network, the location of a mobi le unit can be determined by applying WRR processing to at least three distance measurement s, where one or more of the distance measurements are satellite-based distance measurements (e.g., GPS pseudorange measurements) and one or more are wireless network- based distance measurements (e.g., round-trip delay or pilot phase offset measurements). WRR processing provides improved accuracy in the determination of mobile un it position over conventional least mean square techniques.
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公开(公告)号：AU7163200A
公开(公告)日：2001-05-31
申请号：AU7163200
申请日：2000-11-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： TEKIN IBRAHIM , CHIANG TUNG CHING , CHEN BYRON HUA , FREIDENFELDS JOHN
IPC: G01S5/12 , H04B7/06 , H04B7/08 , H04B7/10 , H04B7/26 , H04L12/28 , H04W24/00 , H04Q7/38 , H04Q7/36
Abstract: Network performance of a wireless network is enhanced by using geolocation information. The network enhancement may be achieved by determining call-dropping zones by the use geolocation information and by improving the signal quality in these call-dropping zones. The network enhancement may also be achieved in the form of increased capacity and reduced interference by utilizing geolocation information in beam steering and shaping of intelligent antennas. Rather than having antennas passively steering and shaping their beams in terms of the rays coming directly from mobiles or reflected by objects, geolocation information may be used to steer the beams (i.e., when antennas are adaptive) or select particular beams (i.e., when antennas are fixed-beam). In addition, the network enhancement may be achieved by using geolocation information in downtilt technology. The network enhancement may be further achieved by using geolocation information to reduce mobile registration requirements. The network enhancement may be also achieved by better managing the power level of a mobile. Additionally, the network enhancement may be achieved by enhancing load-balancing capabilities in a wireless system by the use of geolocation information.
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9.发明专利
公开(公告)号：AU1527800A
公开(公告)日：2000-08-24
申请号：AU1527800
申请日：2000-02-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： CHEN BYRON HUA , TEKIN IBRAHIM , FREIDENFELDS JOHN , CHIANG TUNG CHING
Abstract: Information obtained from one or multiple base stations is used to calculate a mobile terminal's location in a cellular system based on combining multiple estimated locations. The estimated locations are averaged using a weighted sum, where the weights reflect the quality of information or data that produced the estimated location. The estimated locations are based on information such as time difference of arrival (TDOA), time of arrival (TOA), and angle of arrival (AOA). The round-trip delay (RTD) provides TOA information, and the pilot strength measurement messages (PSMM) contain the TDOA information, AOA information and the ID of base stations that provide signals to the mobile terminal.
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公开(公告)号：AU3131801A
公开(公告)日：2001-10-04
申请号：AU3131801
申请日：2001-03-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： TEKIN IBRAHIM , DA REN , CHEN BYRON HUA
Abstract: Weighted ridge regression (WRR) processing is applied to three or more distance measurements to determine the location of a terminal. For example, in an integrated satellite-based navigation system / wireless network, the location of a mobile unit can be determined by applying WRR processing to at least three distance measurements, where one or more of the distance measurements are satellite-based distance measurements (e.g., GPS pseudorange measurements) and one or more are wireless network-based distance measurements (e.g., round-trip delay or pilot phase offset measurements). WRR processing provides improved accuracy in the determination of mobile unit position over conventional least mean square techniques.
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