KR100839010B1 - Location pursuing appratus of mobile terminal within repeater service area - Google Patents

Abstract

An apparatus for pursuing a location of a terminal located in a repeater service area is provided to recognize all mobile terminals present within the repeater service area regardless of a GPS(Global Positioning System) function and without a delay device giving effects on a service. A repeater interface unit(501) is connected to a repeater(250) which wants location pursuit, and performs an interface function. A clock synchronizing unit(502) performs clock synchronization between a base station and a location pursuing apparatus(500). An access channel receiving unit(503) extracts subscriber information in an access channel of mobile terminals by demodulating an RF(Radio Frequency) signal received through the repeater interface unit. A location information storing unit(504) produces, updates and stores a list for the extracted subscriber information, and stores information about the repeater. A data processing unit(505) receives the stored subscriber information list and repeater information from the location information storing unit at predetermined time intervals, and transmits the received list and information to a device which wants an LBS(Location Based Service).

Description

Location Pursuing Appratus of Mobile Terminal within Repeater Service Area}

1 shows the configuration of a location tracking system using GPS satellites according to the prior art.

Figure 2 shows a position tracking system with a delay module installed in the repeater according to another prior art.

Figure 3 shows the configuration of a location tracking device according to the present invention.

4 shows that the location tracking device of the present invention according to FIG. 3 is connected to a mobile communication network.

5 is a flow chart illustrating a method for location tracking using a location tracking device in accordance with the present invention.

The present invention relates to a location tracking device of a terminal located in a service area of a mobile communication repeater.

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.

In the conventional location tracking system, 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 are configured to obtain a three-dimensional position. If you want to receive a signal from four or more GPS satellites 110 to calculate the distance (R1, R2, R3, R4) between the mobile terminal and each satellite, using the additional information received from the GPS satellites 110 Calculate the position of the mobile terminal 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. Since the cell area is relatively large, the error range becomes relatively large, thereby making it impossible to accurately detect the position of 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.

On the other hand, regardless of whether or not having a GPS function to enable the location tracking of each repeater level without incurring the computational load of each base station, in another prior art connected to the base station 200 as shown in FIG. All the repeaters 250-1 and 250-2 are additionally equipped with delay modules having significantly different delay values, so that the RTDs are designed to be completely different for each repeater 250-1 and 250-2. There is also a method of determining which repeater the mobile terminals 100-2 and 100-3 are near by the difference of the difference. However, in this method, a delay module must be additionally installed. Due to the arc coming in through the path, it is often difficult to track the repeater level because the incorrect RTD is measured instead of the originally designed RTD. Hi when the repeater is installed in a base station, the number is the service delay is significantly different depending on the use to which the repeater is delayed value is significantly different adverse effect on the service performance.

In view of the above problems, the present invention provides a location tracking system that enables all mobile terminals in a repeater service area to be recognized regardless of whether the mobile terminal has a GPS function and without the need for a delay device that affects the service. Provide the device.

In order to achieve the object of the present invention as described above, the present invention,

In the location tracking device of the terminal located in the mobile communication repeater service area,

A repeater interface unit connected to a repeater for which position tracking is performed and performing an interface function; A clock synchronizer for synchronizing clocks with a base station and the position tracking device; An access channel receiver for demodulating the RF signal received through the relay interface unit and extracting subscriber information from an access channel of mobile terminals; A location information storage unit for creating, updating, and storing a list of the extracted subscriber information, and storing information about the repeater; And a data processing unit for receiving the stored subscriber information list and repeater information at the predetermined time interval from the location information storage unit and transmitting a location based service to a desired device.

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

3 shows a schematic configuration of a CDMA mobile terminal repeater position tracking device 500 (hereinafter, referred to as position tracking device) as one embodiment of the present invention.

The mobile terminal position tracking apparatus 500 according to the present invention includes a repeater interface unit 501, a clock synchronizer 502, an access channel receiver 503, a location information storage unit 504, a data processor 505, and the like. do.

The repeater interface unit 501 is connected to the repeater 250 to perform an interface function, and the clock synchronizer 502 performs clock synchronization between the base station and the position tracking device of the present invention.

In order to synchronize the clock with the base station, the clock synchronizing unit 502 receives the current approximate time information (TOD) message from the location tracking server 600 through the network, and time is finely based on the time. Try to detect the access channel by changing the. If no access channel is detected, the time is continuously changed to find a time at which the access can be detected. Finding the exact time the access channel is detected is in sync with the base station.

The access channel receiver 503 demodulates the RF signal received through the repeater 250, converts the RF signal into a data stream, and extracts subscriber information from access channels of CDMA mobile terminals distributed in various frequency bands. At this time, the extracted subscriber information indicates a mobile terminal (subscriber) existing in the service area covered by the repeater 250. The extracted subscriber information is transmitted to the location information storage unit 504, forms a subscriber information list through the transmitted subscriber information, stores it together with the repeater information (device unique number), and transmits it to the mobile communication network every predetermined time. In order to perform the giving function, at a predetermined time interval, the subscriber information list and the repeater information are sent to the data processing unit 505 so as to require information on the mobile terminal located in the relay 250 service area (for example, For example, it is transmitted to the location tracking server 600, the location tracking server 600 utilizes the information on the mobile terminal located in the service area of the repeater 250 installed in each base station for location-based services.

4 illustrates a configuration in which the location tracking apparatuses 500-1 and 500-2 of the present invention according to FIG. 3 are connected to a mobile communication network.

The mobile terminals 100-1, 100-2, and 100-3 are terminals not only performing wireless telephone calls through the mobile communication network but also performing location registration with respect to the wireless base station 200 that manages the area in which they are currently located. .

The mobile terminals 100-1, 100-2, and 100-3 are personal digital assistants (PDAs), cellular phones, personal communication service (PCS) phones, global system for mobile (GSM) phones, and wideband CDMA (W-CDMA). Phone), CDMA-2000 phone, Mobile Broadband System (MBS) phone, etc. Here, MBS phone refers to a mobile phone to be used in the fourth generation system.

The wireless base station 200 is arranged in units of cells, and transmits a call request generated from the mobile terminals 100-1, 100-2, and 100-3 to the mobile switching center 400 or manages its own. A location registration process for identifying the location of the mobile terminals (100-1, 100-2, 100-3) existing in the cell area is processed.

The base station controller 300 performs various functions required for radio call processing such as handoff while controlling and managing a plurality of base stations 200. In addition, the base station controller 300 transmits subscriber information of the location-registered mobile terminals 100-1, 100-2, and 100-3 to the mobile switch 400.

The mobile switch 400 has a control function for allowing the base station 200 to operate efficiently and an interworking function with the switch of the public telephone network. In addition, when the location 400 of the mobile terminals 100-1, 100-2, and 100-3 is performed through the base station 200, the switch 400 visits the location register 700 of the visitor 400 (VLR :). After temporarily storing subscriber information of the mobile terminals 100-1, 100-2, and 100-3 in the Visitor Location Register (hereinafter referred to as VLR), the home location register 800 (HLR: Home Location Register, hereinafter) is stored. It requests a location registration of the mobile terminal (100-1, 100-2, 100-3) to the 'HLR'.

Here, the HLR 800 is a database that stores service profiles related to subscriber information of users of the mobile terminals 100-1, 100-2, and 100-3, and includes the subscriber's telephone call and the mobile terminal 100-1. It has information on a mobile identification number (MIN), a terminal unique number (Electronic Serial Number (ESN)), and a service type. The HLR 800 stores a subscriber information including information of the wireless base station 200 and the mobile switch 400 where the mobile terminals 100-1, 100-2, and 100-3 are located. The mobile switch 400 includes a control unit, a call path unit, and a peripheral device, and has a charging data collection function for the mobile terminal (100-1, 100-2, 100-3).

In addition, the location tracking apparatuses 500-1 and 500-2 of the present invention are connected to the repeaters 250-1 and 250-2, and receive subscriber information from each of the repeaters 250-1 and 250-2 to schedule them. The relay information and the subscriber information list are transmitted to the location tracking server 600 at a time interval, and the location tracking server 600 provides information on the mobile terminals in the area serviced by the relays 250-1 and 250-2. By performing the location-based service through the information, or by transmitting the subscriber information and repeater information to the VLR 700 or HLR 800 through the switch 400, the mobile terminal (100-1, 100) to the base station level rather than the base station level -2, 100-3) to store a more accurate position.

Now, a method of collecting information on a mobile terminal in an area serviced by a repeater in mobile communication using the location tracking apparatus 500 according to the present invention will be described with reference to FIG. 5.

The position tracking device 500 according to the present invention is connected to the repeater 250 that the position tracking is desired (S1).

Next, repeater information (relay device number, installation location, related base station information, etc.) of the repeater 250 is stored in the location information storage device 504 (S2).

Now, the access channel receiving unit 503 that receives the RF signal through the repeater interface unit 501 demodulates the RF signal and extracts subscriber information from the access channel of the mobile terminal currently using the repeater (S3).

The extracted subscriber information is transmitted to the location information storage unit 504 to create and update the subscriber information list (S4).

If the predetermined time has not elapsed, the above steps S3 and S4 are repeated.

When a predetermined time elapses, the subscriber information list and repeater information stored in the location information storage unit 504 are transmitted to the data processing unit 505, the timer for measuring the predetermined time elapsed is reset, and the subscriber information list is reset (S5).

The data processing unit 505 transmits the relay information and the subscriber information list to the location tracking server 600 (S6).

The location tracking server 600 performs location based service using mobile terminal information existing in the service area of each repeater 250 through the repeater information and the subscriber information list of each repeater 250 delivered at predetermined time intervals. (S7).

At this time, the location tracking device 500 transmits the repeater information and the subscriber information list to the VLR 700 or the HLR 800 via the mobile switch 400, if necessary, in the VLR 700 or the HLR 800. It is possible to store the exact location of the mobile terminal in units of repeaters rather than units of base stations.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains various modifications and variations without departing from the essential characteristics of the present invention. This can be seen.

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, the present invention can recognize all mobile terminals in the repeater service area regardless of whether the mobile terminal has a GPS function and without the need for a delay device that affects the service. It is possible to provide a location tracking device.

Claims (7)

In the location tracking device of the terminal located in the mobile communication repeater service area, A repeater interface unit connected to a repeater for which position tracking is performed and performing an interface function; A clock synchronizer for synchronizing clocks with a base station and the position tracking device; An access channel receiver for demodulating the RF signal received through the relay interface unit and extracting subscriber information from an access channel of mobile terminals; A location information storage unit for creating, updating, and storing a list of the extracted subscriber information, and storing information about the repeater; And a data processor for receiving the stored subscriber information list and repeater information from the location information storage unit at predetermined time intervals and transmitting a location-based service to a desired device. Location tracking device. The apparatus of claim 1, wherein the clock synchronizer receives time information from a device for the location-based service and adjusts time to find and synchronize an access channel. . The terminal of claim 1, wherein the preparation and updating of the subscriber information list is made and updated based on the subscriber information extracted by the access channel receiving unit on a predetermined time interval basis. Location tracking device. 2. The apparatus of claim 1, wherein the subscriber information list is also transmitted to a home location register via an exchange. In the location tracking method of a terminal located in a mobile communication repeater service area, A repeater interface step of connecting a repeater interface unit performing an interface function to a repeater for which position tracking is desired; A clock synchronizing step of synchronizing clocks with the base station and the positioning apparatus; An access channel receiving step of demodulating the RF signal received through the relay interface step and extracting subscriber information from an access channel of mobile terminals; A location information receiving step of creating, updating, and storing a list of the extracted subscriber information, and storing information about the repeater; Receiving the stored subscriber information list and repeater information at regular intervals, and transmitting the location-based service to the desired device comprising the step of tracking the location of the terminal located in the mobile communication repeater service area. [6] The method of claim 5, wherein the clock synchronization receives time information from the device for tracking the location, adjusts the time, and finds and synchronizes an access channel. The method of claim 5, wherein the creation and updating of the subscriber information list is made and updated based on the subscriber information extracted at the predetermined time interval unit.

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