KR100549043B1 - Apparatus and Method for Pursuing Location of Mobile Terminal - Google Patents

Abstract

The present invention receives subscriber information from an mobile terminal through an access channel, and receives location information on a current location through a location information receiver provided therein, and transmits the device information with a device unique number information to a mobile communication network. An apparatus and method for tracking subscriber location using access channel information, wherein the subscriber location tracking device 200 according to the present invention receives location information of latitude and longitude from a GPS satellite 110 and establishes an access channel from a mobile terminal 310. Receives subscriber information (MIN / ESN) through the device, and transmits to the location information query 240 with the device unique number, the location information query 240 to the subscriber location tracking device to the mobile switching center 330 at regular intervals. It is characterized in that the location information of 200, the device unique number, and the subscriber information of the mobile terminal 310 is transmitted. According to the present invention, a service provider can easily provide a location tracking service to a user through a low cost and small subscriber location tracking device. In addition, various service contents may be provided to a mobile terminal not equipped with a satellite signal receiver. In addition, various location information services may be provided in a satellite signal shadow area such as inside a building.

Reverse Access Channel, Mobile Terminal, Location Tracking, CDMA, Subscriber Location

Description

Apparatus and Method for Pursuing Location of Mobile Terminal}

1 is a block diagram showing the configuration of a mobile terminal position tracking system 100 using a GPS satellite according to the prior art

2 is a block diagram of a mobile terminal location tracking device 200 according to a preferred embodiment of the present invention

3 is a configuration diagram of a mobile terminal location tracking system to which the mobile terminal location tracking apparatus 200 according to FIG. 2 is applied.

4 is a flowchart illustrating a method for tracking a location of a mobile terminal according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: location tracking system 110: GPS satellites

120: base station 130: GPS receiver

140: mobile switching center 150: application server

200: subscriber location tracking device 210: satellite signal receiver

212: satellite receiving antenna 214: satellite positioning receiver

220: access channel receiver 222: receiving antenna

224: RF receiver 230: location information processing unit

232: CDMA demodulator 234: control processor

240: location information query 300: mobile communication system

310: mobile terminal 320: wireless base station

322: base station transmitter 324: base station controller

330: mobile switching center 332: HLR

334: VLR

The present invention relates to a subscriber location tracking system and method, and more particularly, to receive subscriber information from a plurality of mobile terminals through an access channel, and to receive location information on a current location through a satellite signal receiver provided therein. In addition, the present invention relates to a mobile terminal location tracking system for tracking the location of mobile terminals by using a mobile terminal location tracking device that transmits device unique number information to a mobile communication network.

The mobile terminal is wirelessly connected to a base station that manages a certain cell area to perform voice call and data communication through the mobile switching center. The mobile switching center tracks real-time movement paths of mobile communication subscribers by registering location information of mobile terminals connected to each base station in a VLR (Visitor Location Register) and HLR (Home Location Register).

Recently, a location based service (LBS) has been implemented to detect a location of a mobile communication subscriber in real time and automatically transmit various information about a specific region to a mobile terminal. In providing such location-based services, the accuracy of location information for mobile terminals in a particular area is an important factor in determining the level of location-based services. That is, the greater the error range of the location information of the mobile terminal in a specific region, the more accurate location-based service becomes impossible.

In order to provide such a location-based service, a method of tracking the location of a mobile terminal using a current GPS (Global Positioning System) will be described with reference to FIG.

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In the conventional location tracking system 100, when the subscriber operates the GPS receiver 130 by pressing a specific button of the mobile terminal as shown, at least three GPS receivers 130 mounted on the mobile terminal (three-dimensional In order to obtain the location, the signal is received from four or more GPS satellites 110 to calculate the distances R1, R2, R3, and R4 between the mobile terminal and each satellite, and additional information received from the GPS satellites 110. The calculated position is automatically passed through the mobile switching center 140 using the cellular network and then transmitted to the application server 150 requiring the subscriber's location information.

This method has the advantage of detecting the exact position according to the GPS signal by using a mobile terminal with a built-in GPS module or a separate external GPS. However, a mobile subscriber can use a mobile terminal or an external GPS with a built-in GPS module. Since the module must be purchased separately, not only the economic burden on the subscriber side, but also the GPS module also needs to use the power of the terminal battery, thereby increasing the power consumption of the terminal. In addition, since the signal transmitted from the GPS satellite reaches a terminal on the earth, it is a very weak signal, so it is difficult to receive the GPS signal when there is an obstacle between the mobile terminal and the GPS satellite such as indoors, underground, or between urban buildings. There is a problem in that the shadow area is impossible to determine the location.

Unlike the prior art, there are various methods that do not require modification of the mobile terminal. Among them, a method that is frequently used is a method of using arrival time. In the method using the arrival time, a signal transmitted from a mobile terminal is received at various base stations around the terminal, the distance between the mobile terminal and the base station is obtained by measuring the arrival time of the signal received at each base station, and the distance is a radius. After a virtual circle is drawn around the base station, the point where these circles intersect is estimated as the location of the mobile terminal.
However, this method requires the use of at least three base stations around the mobile terminal. If the subscriber is located in a suburban area, it is not easy to track the location because there are not three or more base stations nearby. Due to the relatively large cell area under jurisdiction, the error range becomes relatively large, which makes accurate position detection impossible for the mobile terminal.
Even if such a method is possible, in order to determine the location of the mobile terminal, each base station needs an operation process of calculating a distance between the mobile terminal and each base station by measuring the arrival time of the signal of the mobile terminal received at each base station. Since a calculation process is needed to estimate the intersections of the plurality of circles, these operations are performed on a large number of mobile terminals, and an additional computational load is applied to such a calculation at each base station.

In order to solve the above problems, the present invention is a mobile terminal location tracking device that can recognize all mobile terminals in a specific area, regardless of whether or not the mobile terminal has a GPS function, and there is no computational load in the base station as described above Provides a mobile terminal location tracking system and tracking method for tracking the location of mobile terminals.

In order to achieve the above object, the present invention is a mobile terminal location tracking device for receiving location information from a GPS satellite as a satellite signal, and receives subscriber information from the mobile terminal and transmits it to a mobile communication network, the location information received by a satellite signal A satellite signal receiver; An access channel receiver configured to receive and demodulate the subscriber information as an RF signal through an access channel from the mobile terminal; A location information processing unit which extracts the subscriber information from the access channel data received from the mobile terminal and transmits the subscriber information together with the location information; And a location information inquiry device which stores the subscriber information and the location information transmitted from the location information processing unit and transmits the location information with the device unique number to the mobile communication network every predetermined time. do.

According to another object of the present invention, a mobile terminal location tracking method using reverse access channel information for receiving location information from a GPS satellite as a satellite signal, receiving subscriber information from a mobile terminal, and transmitting the subscriber information to a mobile communication network. A first step of receiving the location information from a satellite in a satellite signal; A second step of receiving the subscriber information from the mobile terminal through an access channel; A third step of converting and demodulating the location information and the subscriber information into CDMA data; And a fourth step of transmitting the location information and the subscriber information together with the device unique number to the mobile communication network.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram schematically showing the configuration of the CDMA mobile terminal location tracking apparatus 200 as one embodiment of the present invention.

The mobile terminal location tracking apparatus 200 according to the present invention includes a satellite signal receiver 210, an access channel receiver 220, a location information processor 230, a location information query 240, and the like.

The satellite signal receiver 210 receives current location information as a satellite signal from the GPS satellite 110. The satellite signal receiver 210 includes a satellite receiver antenna 212 having a built-in amplifier and a window attachable to receive a weak satellite signal, and a satellite position for extracting accurate position information from the received satellite signal. It has a configuration including a receiver 214. The satellite reception antenna 212 is preferably attached to a place where the field of view is secured so that an average of four or more satellite signals can be received. The satellite position receiver 214 reproduces the 1 second periodic clock synchronized with the received satellite signal, and transmits the 10 MHz frequency signal to the access channel receiver 220 using the reproduced 1 second periodic clock, and the system clock and 2 The second period clock is transmitted to the location information processor 230. The satellite location receiver 214 also transfers the extracted location information to the location information processor 230.

The access channel receiver 220 receives and demodulates an RF signal through an access channel from a mobile communication network. The access channel receiver 220 includes a reception antenna 222 for receiving a CDMA RF signal and an RF receiver 224 for converting and demodulating the received CDMA RF signal into a data stream. Here, the reception antenna 222 may use a built-in antenna to facilitate device configuration, and may be configured as a patch antenna to provide directivity to the front surface. Depending on the environment, a separate external antenna may be used to adjust the antenna direction. In addition, the RF receiver 224 performs a function of periodically changing the reception frequency of the CDMA mobile terminal distributed in various frequency bands while using a single reception path.

The location information processing unit 230 extracts subscriber information from the access channel data received from the mobile communication network, and extracts the information of the subscribers from the mobile terminal (subscriber) in the area covered by the mobile terminal location tracking device 200. Indicates. The location information processor 230 transmits such subscriber information to the location information query 240 together with the location information. The location information processor 230 extracts and demodulates only access channel data from the transmitted reverse channel data, and separates the message including the subscriber information from the demodulated access channel data by the CDMA demodulator 232 and the CDMA demodulator 232. And a control processor 234 for extracting subscriber information from the delivered message and sending the extracted subscriber information to the location information query 240 together with the location information and the device unique number. Here, the CDMA demodulator 232 demodulates the number of access channels set by the control processor 234 because a plurality of access channel data transmitted by the base station of the mobile communication network. In order to synchronize with the base station, the control processor 234 sets the channel demodulator in the same manner as the pilot offset, which is a base station unique number.

The location information inquiry unit 240 stores the transmitted subscriber information, the device unique number, and the device location information, and transmits the stored location information to the mobile communication network every predetermined time. In addition, the location information query 240 performs a subscriber location search function to the subscriber, and also performs a function of processing the stored information according to the service.

3 is a diagram illustrating an example of configuring a mobile terminal location tracking system 300 by applying the mobile terminal location tracking apparatus 200 according to FIG. 2.

Mobile terminal location tracking system 300 is a mobile terminal 310, wireless base station 320, mobile switching center 330, HLR 332, VLR 334, subscriber location tracking device 200 of the present invention And the application server 150 is added.
For convenience of explanation in FIG. 4, a description will be given of a conventional mobile terminal 310, a wireless base station 320, a mobile switching center 330, an HLR 332, and a VLR 334.

The mobile terminal 310 is a terminal that not only performs a wireless telephone call through a mobile communication network but also performs location registration with respect to a wireless base station 320 that manages a region in which it is currently located.

The mobile terminal 310 is a PDA (Personal Digital Assistant), cellular phone, PCS (Personal Communication Service) phone, Global System for Mobile (GSM) phone, W-CDMA (Wideband CDMA) phone, CDMA-2000 phone, MBS (Mobile) Broadband System) phones and the like. Here, MBS phone refers to a mobile phone to be used in the fourth generation system.

The wireless base station 320 includes a base station transmitter 322, a base station controller 324, and the like. Here, the base station transmitter 322 is disposed in units of cells, and the mobile terminal 310 transmits a call request generated from the mobile terminal 310 to the mobile switching center 330 or exists in a cell area under its control. Process the location registration to get the location of). The base station transmitter 322 may obtain information such as latitude and longitude of the base station transmitter 322 from the GPS satellite 110, and transmit the position information of the base station transmitter 322 through a system parameter message of the forward link call channel. Transfer to the mobile terminal 310. The mobile terminal 310 may register new location information by calculating the moving distance of the mobile terminal 310 itself using the location information of the base station transmitter 322 of the cell to which the mobile terminal 310 belongs.

Location registration is a processing procedure for informing the mobile switching center 330 of the location, status, identifier, slot period, and other features of the mobile terminal 210 via the base station transmitter 322. This is a procedure for effectively calling the mobile terminal 310 when the incoming call is to be set at 310. The location registration of the mobile terminal 310 is performed when the mobile terminal 310 is powered on or off, when the mobile terminal 310 moves between the mobile switching centers 330, and the parameters of the mobile terminal 310. This is done when the site is changed.

The base station controller 324 performs various functions required for radio call processing, such as handoff, while controlling and managing a plurality of base stations. In addition, the base station controller 324 transmits the subscriber information of the location registered mobile terminal 310 to the mobile switching center 330 and also to the subscriber location tracking device 200 through the base station transmitter 322.

The mobile switching center 330 has a control function for allowing the wireless base station 320 to operate efficiently and an interworking function with an exchange of a public telephone network. When the mobile switching center 330 registers the location of the mobile terminal 310 through the wireless base station 320, the visitor location register (VLR) in the mobile switching center 330 (hereinafter referred to as 'VLR') ( After temporarily storing the subscriber information of the mobile terminal 310 in 334, the mobile terminal 310 requests a location registration of the mobile terminal 310 to a home location register (HLR) 332.

Here, the HLR 332 is a database that stores a service profile regarding subscriber information of a user of the mobile terminal 310. The HLR 332 includes a subscriber's telephone call and a mobile identification number (MIN) of the mobile terminal 310. It has information about the Electronic Serial Number (ESN) and the type of service. The HLR 332 stores the subscriber information including the information of the wireless base station 320 and the mobile switching center 330 where the mobile terminal 310 is located. The mobile switching center 330 includes a control unit, a call path unit, and a peripheral device, and also has a charging data collection function for the mobile terminal 310.

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The mobile terminal location tracking device 200 installed at a specific desired location receives the latitude and longitude location information from the GPS satellites 110, and receives subscriber information from the mobile terminals 310 through the access channel. Along with the number is sent to the location information query 240. Accordingly, the location information inquiry device 240 transmits the location information of the mobile terminal location tracking device 200, the device unique number, and the subscriber information of the mobile terminal 310 to the mobile switching center 330 at predetermined time intervals. The mobile switching center 330 updates and stores the location information of the mobile terminal 310 in the HLR 332 or the VLR 334. In this way, the subscriber information of the mobile terminals 310 existing in the area covered by the specific mobile terminal location tracking device 200 is stored in the HLR 332 or the VLR 334.

Next, with reference to the accompanying Figure 4 will be described in detail with respect to the CDMA mobile terminal (subscriber) location tracking method according to a preferred embodiment of the present invention.

The subscriber location tracking device 200 according to the present invention receives location information as a satellite signal from the GPS satellite 110 or receives subscriber information such as a terminal number (MIN) and a terminal serial number (ESN) from the mobile terminal 310. In the waiting state that can be received (S402).

When the mobile terminal location tracking device 200 receives the location information from the GPS satellite 110 through the satellite reception antenna 212, the mobile terminal location tracking device 200 transmits the location information to the location information processor 230 through the satellite location receiver 214. (S404). At this time, the satellite position receiver 214 reproduces the synchronized 1 second periodic clock from the received signal, and transfers the 10 MHz frequency signal to the access channel receiver 220 using the reproduced 1 second periodic clock, the system clock and 2 The second period clock is transmitted to the location information processor 230.

Subsequently, when the subscriber location tracking device 200 receives the subscriber information from the mobile terminal 310 through the access channel to the receiving antenna 222 (S408), the subscriber location tracking apparatus 200 receives the received CDMA RF signal through the RF receiver 224. The CDMA data stream is converted to the location information processor 230 (S410).

The location information processor 230 demodulates the location information and the subscriber information in the CDMA demodulator 232, and transfers the location information and the subscriber information to the location information query device 240 together with the unique number of the mobile terminal location tracking device 200. (S412). The user may obtain the location information of the mobile terminal 310 through the location information query 240, and for this purpose, the location information query 240 may be connected to the Internet so that it can be checked at any time.

The location information inquiry unit 240 counts a predetermined time (S414), and when the predetermined time elapses, transmits the location information, the subscriber information, and the device unique number to the application server 150 (S416).

The application server 150 uses the HLR 332 or the VLR through the mobile switching center 330 based on the location information transmitted from each mobile terminal location tracking device 200, the subscriber information, and the unique number of the mobile terminal location tracking device. 334 transmits information about the mobile terminal 310 in the area covered by the mobile terminal location tracking apparatus 200 to the location of the mobile terminal 310 stored in the HLR 332 or the VLR 334. Update the information.

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The above description is merely illustrative of the technical idea of the present invention, and it is easy for those skilled in the art to make various modifications and changes without departing from the essential characteristics of the present invention. I can tell. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, a service provider can easily acquire location information on a mobile terminal (subscriber) in a specific region through a low cost and small subscriber location tracking device. In addition, by using the obtained information, various service contents can be provided to a mobile terminal not equipped with a satellite signal receiver. In addition, various location information services may be provided in a satellite signal shadow area such as inside a building.

Claims (10)

In the mobile terminal location tracking device, A satellite signal receiver for receiving location information from a GPS satellite; An access channel receiver configured to receive access channel data including subscriber information from mobile terminals; A location information processing unit which extracts the subscriber information from the access channel data and transmits the subscriber information together with the location information; And And a location information inquiry device for transmitting the subscriber information and the location information transmitted from the location information processing unit together with the unique number of the location tracking device to the mobile communication network. delete The method of claim 1, The satellite signal receiver includes a satellite receiver antenna, an amplifier for amplifying a satellite signal received from the satellite receiver antenna, and a satellite position receiver for extracting accurate position information from the received satellite signal. Location tracking device. The method of claim 1, And the access channel receiver comprises a reception antenna for receiving an RF signal of a corresponding mobile communication method and an RF receiver for converting and demodulating the RF signal into a data stream. The method of claim 1, The location information processing unit, A demodulator for extracting and demodulating only access channel data from received reverse channel data and separating a message including the subscriber information from the demodulated access channel data; And a control processor for extracting the subscriber information from the message transmitted from the demodulator, and transmitting the extracted subscriber information to the location information inquiry unit together with the location information and the device unique number. Mobile terminal location tracking device. In the mobile terminal location tracking method, A satellite signal receiving step of receiving location information from a GPS satellite; An access channel receiving step of receiving access channel data including subscriber information from mobile terminals; A location information processing step of extracting the subscriber information from the access channel data and transmitting it together with the location information; And And a location information inquiry step of transmitting the subscriber information and the location information transmitted from the location information processing step to the mobile communication network together with the unique number of the mobile terminal location tracking device. delete The method of claim 6, The location information processing step, A demodulation step of extracting and demodulating only access channel data from the received reverse channel data, and separating a message including the subscriber information from the demodulated access channel data; And a control processing step of extracting the subscriber information from the message delivered in the demodulation step, and transmitting the extracted subscriber information to the location information query together with the location information and the device unique number. Location tracking method. Receiving location information from a GPS satellite to extract its own location information, receiving access channel data including subscriber information from mobile terminals to extract the subscriber information, and tracking the subscriber information and location information of the mobile terminal location From mobile terminal positioning devices that transmit to the mobile network with the device's unique number, A computer device for storing information about mobile terminals existing in an area where each mobile terminal location tracking device is located by receiving and storing the subscriber information, location information, and a unique number corresponding to each mobile terminal location tracking device. Mobile device location tracking server device comprising a. Receiving location information from a GPS satellite to extract its own location information, receiving access channel data including subscriber information from mobile terminals to extract the subscriber information, and tracking the subscriber information and location information of the mobile terminal location From mobile terminal positioning devices that transmit to the mobile network with the device's unique number, Receiving and storing the subscriber information, the location information, and the unique number corresponding to each mobile terminal location tracking device, thereby storing information about mobile terminals existing in an area where the mobile terminal location tracking device is located; A processing method of a mobile terminal position tracking server device comprising a.

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