JP2004104349A - Radio terminal equipment and radio communication system - Google Patents

Radio terminal equipment and radio communication system Download PDF

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Publication number
JP2004104349A
JP2004104349A JP2002261803A JP2002261803A JP2004104349A JP 2004104349 A JP2004104349 A JP 2004104349A JP 2002261803 A JP2002261803 A JP 2002261803A JP 2002261803 A JP2002261803 A JP 2002261803A JP 2004104349 A JP2004104349 A JP 2004104349A
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JP
Japan
Prior art keywords
base station
base stations
wireless terminal
detection
information
Prior art date
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Pending
Application number
JP2002261803A
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Japanese (ja)
Inventor
Takehiko Toyoda
Hiroshi Yoshida
吉 田   弘
豊 田 毅 彦
Original Assignee
Toshiba Corp
株式会社東芝
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Publication date
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Priority to JP2002261803A priority Critical patent/JP2004104349A/en
Publication of JP2004104349A publication Critical patent/JP2004104349A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide radio terminal equipment and a radio communication system that enable the accurate position detection of the radio terminal equipment by a simple method. <P>SOLUTION: The radio communication system has multimode radio terminal equipment 1 corresponding to a plurality of network systems. Around the radio terminal equipment 1, there are base stations BS1 to BS3 corresponding to a network system (carrier) A, base stations BS4, BS5 corresponding to a network system (carrier) B, and base stations BS6, BS7 corresponding to a network system (carrier) C. Even if the radio terminal equipment 1 is positioned at a place for preventing radio waves from at least three base stations of the same carrier from being received, the radio communication among the base stations of other carriers enables the accurate detection of the position of the radio terminal equipment 1 by utilizing a 3-point measurement method. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless terminal device and a wireless communication system corresponding to a plurality of different types of network systems.
[0002]
[Prior art]
With the increase in the number of users of mobile communication terminals and the diversification of services, various mobile communication systems are provided by many operators. The demand for a multi-mode mobile communication terminal corresponding to a plurality of systems is rapidly increasing so that the mobile communication terminal can be shared between different systems.
[0003]
On the other hand, with the obligatory use of E911 (Enhanced 911, a wireless emergency notification system in the event of a disaster, etc.) in the United States, the function of detecting the position information of mobile communication terminals is becoming essential, and various systems are being studied and proposed. .
[0004]
As a conventionally proposed mobile communication terminal having a position information detecting function, there is a method using an artificial satellite radio wave for detecting position information such as a GPS (Global Positioning System). Can be specified. In addition, a method called differential GPS in which GPS information is once transmitted to a base station, a detailed position is detected in a network connected to the base station, and the terminal is notified to a terminal has been proposed.
[0005]
However, in these systems, a GPS reception function is indispensable, and an extra high-frequency circuit and a signal processing circuit are required only for detecting position information, which makes it difficult to miniaturize the terminal. In addition, there is an extremely large drawback that extra power consumption is consumed for receiving GPS, and the standby time of the terminal is greatly reduced.
[0006]
In order to solve such a problem, there has been proposed a method which does not require a dedicated receiving circuit for detecting position information such as GPS. This is a method of detecting terminal position information based on information of a plurality of base stations (for example, see Patent Literature 1 and Patent Literature 2).
[0007]
FIG. 6 is a diagram schematically illustrating a conventional wireless communication system having a position information detecting function, in which position information is detected without using a dedicated position detecting system such as a GPS.
[0008]
FIG. 6 shows an example in which six base stations BS1 to BS6 exist around the wireless terminal device. Base stations BS1 to BS3 are base stations of carrier A, base stations BS4 and BS5 are base stations of carrier B, and base stations BS6 and BS7 are base stations of carrier C. It is.
[0009]
Here, it is assumed that the wireless terminal device can receive wireless signals from three base stations BS1 to BS3 of carrier A. At this time, in the carrier A network system, each of the three base stations BS1 to BS3 measures the reception electric field strength of the radio signal from the radio terminal device, and, based on the measurement result, uses the three-point measurement method. It is possible to estimate the position of the wireless terminal device. The position information estimated by this network system is transmitted to the wireless terminal device, and is used for providing route guidance, nearby shop information and traffic information, and the like.
[0010]
Further, when the wireless terminal device holds the position information of the base stations BS1 to BS3 in advance, the position of the wireless terminal device itself can be detected without the help of the network system of the carrier A. More specifically, by sequentially receiving radio signals from base stations BS1 to BS3 of carrier A, and comparing the obtained base station ID with the position information of each base station stored in advance by itself, Detect your position.
[0011]
As described above, the conventional wireless communication system shown in FIG. 6 does not use a dedicated position detection system such as GPS or the like, and uses the wireless terminal device based on the reception electric field strength of wireless signals from a plurality of base stations of the same carrier. Location information was detected.
[0012]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-52101
[Patent Document 2]
JP-A-7-181242
[Problems to be solved by the invention]
However, the wireless communication system of FIG. 6 has the following two problems. One is that if only radio waves from two or less base stations can be received by the wireless terminal device, the position information cannot be detected. For example, in FIG. 6, a wireless terminal device corresponding to carrier A can receive wireless signals from three base stations BS1 to BS3, so that position measurement is possible. In the case of a terminal device, since there are only two base stations BS4 and BS5 or BS6 and BS7 around the wireless terminal device, the above-described three-point measurement method cannot be used, and the position of the wireless terminal device cannot be detected. That is, in the wireless communication system of FIG. 6, if wireless communication is not possible with at least three base stations, the position of the wireless terminal device cannot be detected.
[0015]
Another problem is that the position detection error increases when the position of the base station is far away from the wireless terminal device. Generally, the zone radius of a mobile communication system such as a PDC (Personal Digital Cellular system) or a GSM (Global System for Mobile communications) is about 0.5 to 20 km. For this reason, the position information detected by the wireless terminal device includes an error of several hundred meters to several kilometers, and it is difficult to perform high-accuracy position detection.
[0016]
A common problem between the case where position detection is performed using an artificial satellite such as a GPS and the case where position detection is performed by wireless communication with a base station is that position detection may not be possible indoors or underground. . Since radio waves from artificial satellites do not reach indoors and underground, position detection by GPS is impossible. Also, indoors and underground, the number of base stations is limited, and three or more base stations of the same carrier There is hardly any environment that enables wireless communication with the Internet.
[0017]
The present invention has been made in view of such a point, and an object of the present invention is to enable high-accuracy position detection of a wireless terminal device by a simple method without using a dedicated position detection system such as a GPS. To provide a wireless terminal device and a wireless communication system.
[0018]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention provides a first base station corresponding to a first network system, a second base station corresponding to a second network system, and the first or second base station. A wireless communication unit capable of performing wireless communication with the network system or a third base station corresponding to the third network system; and a wireless communication unit transmitted from each of the first to third base stations. A base station information detection unit that detects at least one of an electric field strength of a radio signal received by the radio communication unit and a propagation time difference of a radio signal transmitted and received between the first to third base stations; A position detection unit that detects a position of the base station based on a detection result by the base station information detection unit and position information of each of the first to third base stations.
[0019]
In the present invention, wireless communication is performed with a plurality of base stations corresponding to two or more different network systems using a multi-mode wireless terminal device, and the position of the wireless terminal device is detected based on the communication result. As a result, even when the wireless terminal device is located in a place where wireless communication with three or more base stations corresponding to the same network system cannot be performed, the position of the wireless terminal device can be detected.
[0020]
Also, the present invention provides a first base station corresponding to a first network system, a second base station corresponding to a second network system, and the first or second network system or the third base station. A wireless communication unit capable of performing wireless communication with a third base station corresponding to the network system; and a position for issuing a position detection request to a position detection device for detecting the position of the wireless terminal device. A detection requesting unit, a position information measuring unit that measures a reception electric field strength or a propagation time difference of the radio signal from the first to third base stations, and the measured reception electric field strength or the propagation time difference to the position detection device. A position information transmitting unit for transmitting; and a position detection result receiving unit for receiving a position detection result performed by the position detecting device in response to the position detection request.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a wireless terminal device and a wireless communication system according to the present invention will be specifically described with reference to the drawings.
[0022]
(1st Embodiment)
FIG. 1 is a diagram schematically illustrating a first embodiment of a wireless communication system according to the present invention. The wireless communication system in FIG. 1 includes a multi-mode wireless terminal device 1 corresponding to a plurality of network systems, and base stations BS1 to BS3 corresponding to a network system (carrier) A around the wireless terminal device 1. And base stations BS4 and BS5 corresponding to the network system (carrier) B, and base stations BS6 and BS7 corresponding to the network system (carrier) C.
[0023]
Among the base stations BS1 to BS7, the base stations BS1, BS2, BS4 to BS7 are located in the communication area with the wireless terminal device 1, but the base station BS3 is located outside the communication area with the wireless terminal device 1. That is, in the case of FIG. 1, since there are only two base stations of the same carrier that can wirelessly communicate with the wireless terminal device 1, the position of the wireless terminal device 1 cannot be detected by the conventional method shown in FIG.
[0024]
The wireless terminal device 1 in FIG. 1 can perform wireless communication with base stations of at least two types of carriers. Here, the specific type of the carrier is not particularly limited, but for example, a general-purpose carrier such as PDC, Cdma-One, W-CDMA, PHS, and CDMA2000 can be applied.
[0025]
FIG. 2 is a block diagram illustrating an example of an internal configuration of the wireless terminal device 1, and illustrates an internal configuration of a transmission system of the wireless terminal device 1 corresponding to PDC, W-CDMA, and PHS. The description of the receiving system is omitted.
[0026]
The wireless terminal device 1 shown in FIG. 2 includes a digital signal processing unit 2 that outputs an I channel band signal and a Q channel band signal, synthesizers 3 and 4, a quadrature modulator 5, signal branching units 6 and 7, an IF Variable gain amplifiers 8 and 9, IF band-pass filters 10 and 11, frequency converter 12, RF variable gain amplifier 13, RF band-pass filter 14, and a control unit for performing position detection processing to be described later 15 and a storage unit 16 for storing position information and the like of the base station.
[0027]
The digital signal processing unit 2 outputs a control signal C1 corresponding to the input baseband signal. The control signal C1 determines the signal path in the signal branching units 6 and 7, and determines the frequency of the local oscillation signal (LO signal) output from the synthesizers 3 and 4.
[0028]
For example, if the baseband signal input to the digital signal processing unit 2 is for PDC, the signal that has passed through the quadrature modulator 5 passes through the signal branching unit 6, the variable gain amplifier 13 for RF, and the bandpass filter 14 for RF. The RF signal for PDC (887 to 958 MHz) is output from the terminal T2.
[0029]
If the baseband signal input to the digital signal processing unit 2 is for W-CDMA, the signal passing through the quadrature modulator 5 is divided into the signal branching units 6 and 7, the IF variable gain amplifier 8, the IF band The RF signal (1920-1980 MHz) for W-CDMA is output from the terminal T1 through the pass filter 10 and the frequency converter 12.
[0030]
If the baseband signal input to the digital signal processing unit 2 is for PHS, the signal that has passed through the quadrature modulator 5 is divided into the signal branching units 6 and 7, the IF variable gain amplifier 9, the IF bandpass filter. 11 and the frequency converter 12, an RF signal for PHS (1894-1919 MHz) is output from the terminal T1.
[0031]
FIG. 3 is a flowchart illustrating an example of the position detection process performed by the control unit 15 in the wireless terminal device 1 of FIG. First, it is determined whether or not the terminal device itself is in an environment such as indoors or underground where radio waves from three or more base stations of the same carrier cannot be received (step S1). This determination is made by communicating with a specific base station that manages the position of a nearby base station. Alternatively, if there is a base station management device that manages the base station, the determination in step S1 may be performed by accessing such a base station management device.
[0032]
When radio waves from three or more base stations of the same carrier can be received, the position of the own terminal device can be detected by the conventional method shown in FIG. 6, so that the processing of the flowchart of FIG. The process ends. Note that, even when radio waves from three or more base stations of the same carrier can be received, the processing of step S2 and later described later may be performed, and in this case, the processing of step S1 can be omitted.
[0033]
If it is determined in step S1 that there is an environment where radio waves from three or more base stations of the same carrier cannot be received, three base stations that receive radio waves for position detection are selected (step S2). For example, when a specific base station or base station management apparatus manages the position of another base station, a position information request signal is sent to the specific base station or base station management apparatus, and the base station information is transmitted. Receive. Then, three base stations are selected based on the base station information. When there are three or more base station candidates, three base stations are selected in the order of good radio propagation state. From a base station in good wireless condition, it is possible to detect a direct wave with little signal degradation due to reflections and the shortest propagation path, and select based on the measurement result of the received electric field strength or propagation time difference of the direct wave can do.
[0034]
When three base stations are selected, the location information of these three base stations is stored in the storage unit 16 of the wireless terminal device 1 (Step S3).
[0035]
Next, radio waves from the three base stations selected in step S2 are received (step S4). Next, the distance to the base station is detected based on the electric field strength or propagation time difference of the radio wave received in step S4 (step S5), and the detection result is compared with the position information of the base station stored in the storage unit 16. Based on this, the position of the own terminal device is detected by the three-point measurement method (step S6).
[0036]
The position detection result of the own terminal device can be used for the purpose of providing route guidance, information on nearby shops and traffic information, and the like.
[0037]
As described above, in the first embodiment, even when the wireless terminal device 1 is located in a place where radio waves from three or more base stations of the same carrier cannot be received (for example, indoors or underground), other wireless terminals 1 By performing wireless communication with the carrier base station, the position of the wireless terminal device 1 can be accurately detected using the three-point measurement method. Accordingly, accurate position information can be provided to the wireless terminal device 1 indoors and underground, and useful and useful information such as shop information, surrounding shop information and traffic information can be quickly provided.
[0038]
(Second embodiment)
In the first embodiment, the example in which the position detection is performed by the wireless terminal device 1 itself has been described. However, in the second embodiment described below, the position detection of the wireless terminal device 1 is performed and the wireless terminal device 1 is notified. And a position measuring signal generating device.
[0039]
FIG. 4 is a diagram schematically illustrating a second embodiment of the wireless communication system according to the present invention. The radio communication system of FIG. 4 includes a radio terminal device 1, a base station BS1 corresponding to carrier A, a base station BS2 corresponding to carrier B, and a base station BS3 corresponding to carrier C, A signal generator 17 is provided.
[0040]
In the first embodiment, it is assumed that the position information of each base station is made public. However, in the second embodiment, even if the position information of each base station is not made public, the position of each base station can be detected. The feature is that it can be done.
[0041]
FIG. 5 is a flowchart illustrating a processing procedure according to the second embodiment. First, the wireless terminal device 1 sets the terminal position measurement signal generating device 17 to a usable state (enable) (step S11). More specifically, an enable signal is superimposed on a control signal of a preset frequency and transmitted directly to the position measurement signal generator 17 (arrow {circle around (1)} in FIG. 4). Alternatively, a control signal is transmitted from the wireless terminal device 1 to the base station, and an enable signal is transmitted from the base station that has received the control signal to the position measurement signal generator 17.
[0042]
Next, the wireless terminal device 1 receives radio waves from three neighboring base stations and measures the received electric field strength or the propagation time difference (step S12, arrow {circle around (2)} in FIG. 4). Next, the distance to each base station is calculated from the measured reception electric field strength or the propagation time difference (step S13), and the calculation result is transmitted to each base station (step S14, arrow {3} in FIG. 4).
[0043]
Note that the calculation of the distance in step S13 may be performed by each base station instead of the wireless terminal device 1.
[0044]
Next, each base station transmits the distance information sent from the wireless terminal device 1 to the position measurement signal generator 17 (step S15, arrow (4) in FIG. 4).
[0045]
Next, based on the distance information transmitted from each base station and the position information of each base station held in advance by the position measurement signal generating device 17, the radio terminal device 1 Is detected (step S16).
[0046]
Next, the position measurement signal generator 17 notifies the wireless terminal device 1 of the detected position information of the wireless terminal device 1 (step S17, arrow (5) in FIG. 4). More specifically, the position measurement signal generating device 17 superimposes position information on a control signal of a preset frequency and transmits the control signal directly to the wireless terminal device 1. Alternatively, the wireless terminal device 1 transmits the position information from the position measurement signal generator 17 to a specific base station whose position is registered, and this specific base station transmits the positional information to the wireless terminal device 1.
[0047]
As described above, in the second embodiment, since the position measurement signal generation device 17 that detects the position of the wireless terminal device 1 is provided, the wireless terminal device 1 does not need to perform position detection itself, and the wireless terminal device 1 does not need to perform position detection. Processing load can be reduced. In addition, since the position measurement signal generating device 17 holds the position information of each base station in advance, when the position detection request is received from the wireless terminal device 1, the position detection signal of the wireless terminal device 1 can be easily and quickly detected. Can be performed.
[0048]
(Other embodiments)
In each of the above-described embodiments, the radio terminal 1 receives radio waves from the base station and detects the distance to the base station based on the received electric field strength or the propagation time difference. May be detected, the position may be detected based on whether or not the signal can be received.
[0049]
In each of the above-described embodiments, the base station used for position detection is not limited to the base station for the cellular system, and some base stations may be base stations for wireless LAN or Bluetooth. In addition, a specific type such as a cellular system or a wireless LAN system is not particularly limited.
[0050]
Further, the internal configuration of the wireless terminal device 1 is not limited to that shown in FIG.
[0051]
【The invention's effect】
As described in detail above, according to the present invention, by performing wireless communication with a plurality of base stations corresponding to two or more different network systems, the position of a wireless terminal device is detected. Even if the wireless terminal device is located in a place (for example, indoor or underground) where wireless communication cannot be performed with three or more base stations corresponding to the above, position detection can be performed with high accuracy.
[Brief description of the drawings]
FIG. 1 is a diagram schematically illustrating a first embodiment of a wireless communication system according to the present invention.
FIG. 2 is a block diagram showing an example of an internal configuration of the wireless terminal device.
FIG. 3 is a flowchart illustrating an example of a position detection process performed by a control unit in the wireless terminal device in FIG. 2;
FIG. 4 is a diagram schematically illustrating a second embodiment of the wireless communication system according to the present invention.
FIG. 5 is a flowchart illustrating a processing procedure according to the second embodiment;
FIG. 6 is a diagram schematically illustrating a conventional wireless communication system having a position information detecting function.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 wireless terminal device 2 digital signal processing unit 3, 4 synthesizer 5 quadrature modulator 6, 7 signal branching unit 8, 9 IF variable gain amplifier 10, 11 IF bandpass filter 12 frequency converter 13 RF variable gain amplifier 14 RF band pass filter 15 Control unit 16 Storage unit

Claims (12)

  1. A first base station corresponding to the first network system, a second base station corresponding to the second network system, and a second base station corresponding to the first or second network system or the third network system. A wireless communication unit capable of performing wireless communication with each of the third base station;
    The electric field strength of the radio signal transmitted from each of the first to third base stations and received by the radio communication unit, and the propagation time difference of the radio signal transmitted and received between the first to third base stations. A base station information detection unit that detects at least one of:
    A wireless terminal device comprising: a position detecting unit for detecting a position of the base station based on a detection result by the base station information detecting unit and position information of each of the first to third base stations. .
  2. The position detection unit performs its own position detection using the position information held in a base station position information holding unit that holds position information of each of the first to third base stations. The wireless terminal device according to claim 1.
  3. The wireless terminal device according to claim 1, wherein at least two of the first to third base stations are base stations corresponding to different cellular systems.
  4. The wireless terminal device according to any one of claims 1 to 3, wherein at least one of the first to third base stations is a base station compatible with a predetermined wireless LAN system.
  5. 4. A base station selecting unit for selecting three base stations as the first to third base stations when there are four or more base stations capable of wireless communication. 5. The wireless terminal device according to any one of 4.
  6. A first base station corresponding to the first network system, a second base station corresponding to the second network system, and a second base station corresponding to the first or second network system or the third network system. A wireless communication unit capable of performing wireless communication with each of the third base station;
    For a position detection device that performs position detection of the wireless terminal device, a position detection request unit that makes a position detection request,
    A position information measuring unit for measuring a reception electric field strength or a propagation time difference of a radio signal from the first to third base stations;
    A position information transmission unit that transmits the measured reception electric field strength or the propagation time difference to the position detection device,
    A wireless terminal device comprising: a position detection result receiving unit that receives a position detection result performed by the position detection device in response to the position detection request.
  7. The wireless terminal device according to any one of claims 1 to 6, wherein the first to third base stations are provided indoors or underground.
  8. A first base station corresponding to the first network system;
    A second base station corresponding to the second network system;
    A third base station corresponding to the first or second network system or a third network system;
    A wireless terminal device capable of performing wireless communication with the first to third base stations,
    The wireless terminal device,
    The electric field strength of the radio signal transmitted from each of the first to third base stations and received by the radio terminal device, and the propagation time difference of the radio signal transmitted and received between the first to third base stations. A base station information detection unit that detects at least one of:
    A wireless communication system comprising: a position detecting unit that detects a position of the base station based on a detection result by the base station information detecting unit and position information of each of the first to third base stations. .
  9. A first base station corresponding to the first network system;
    A second base station corresponding to the second network system;
    A third base station corresponding to the first or second network system or a third network system;
    A wireless terminal device capable of performing wireless communication with the first to third base stations;
    A position detection device that performs position detection of the wireless terminal device,
    The wireless terminal device,
    A position detection request unit that makes a position detection request to the position detection device,
    A position information measuring unit for measuring a reception electric field strength or a propagation time difference of a radio signal from the first to third base stations;
    A position information transmission unit that transmits the measured reception electric field strength or the propagation time difference to the position detection device,
    A position detection result receiving unit that receives a position detection result performed by the position detection device in response to the position detection request.
  10. The position detection device,
    A position detection request receiving unit that receives a position detection request from the wireless terminal device,
    A position detection unit that detects a position of the wireless terminal device based on the reception electric field strength transmitted from the wireless terminal device and position information of the first to third base stations;
    The wireless communication system according to claim 10, further comprising: a position information transmitting unit configured to transmit the detected position information of the wireless terminal device to the wireless terminal device.
  11. A base station position information holding unit that holds position information of each of the first to third base stations;
    The wireless communication system according to claim 8, wherein the position detecting unit detects the position of the wireless terminal device by using the position information held in the base station position information holding unit.
  12. The wireless terminal communication system according to claim 11, wherein one of the first, second, and third base stations includes the base station position information holding unit.
JP2002261803A 2002-09-06 2002-09-06 Radio terminal equipment and radio communication system Pending JP2004104349A (en)

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JP2007180882A (en) * 2005-12-27 2007-07-12 Kyocera Corp Radio communication terminal device, radio communication system, and radio communication method
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JP2009521868A (en) * 2005-12-22 2009-06-04 京セラ株式会社 Apparatus, system, and method for managing location information in portable communication device
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US8798613B2 (en) 2007-09-17 2014-08-05 Wavemarket, Inc. Systems and method for triggering location based voice and/or data communications to or from mobile ratio terminals
JP2016042733A (en) * 2009-10-12 2016-03-31 クアルコム,インコーポレイテッド Method and device for transmitting indoor context information
US9363782B2 (en) 2011-06-22 2016-06-07 Qualcomm Incorporated Methods and apparatus for wireless device positioning in multicarrier configurations
US9398442B2 (en) 2009-04-21 2016-07-19 Qualcomm Incorporated Supporting version negotiation for positioning for terminals in a wireless network
US9435874B2 (en) 2009-04-21 2016-09-06 Qualcomm Incorporated Method and apparatus for supporting positioning for terminals in a wireless network
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JP2008512961A (en) * 2004-09-07 2008-04-24 クゥアルコム・インコーポレイテッドQualcomm Incorporated Locating wireless devices based on information about base stations belonging to multiple networks
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