KR101163413B1 - Server, System and Method for Measuring Position of Mobile Communication Terminal by Using Transmitted Signal Output Power Value and Received Signal Strength - Google Patents

Abstract

The present invention relates to a server, a system, and a method for positioning a mobile communication terminal using a transmission signal output value and a reception signal strength.

The present invention provides a server, a system, and a method for positioning a mobile communication terminal using the corrected received signal strengths after correcting the received signal strength of each base station received from the mobile communication terminal with the transmission signal output value of each base station. do.

According to the present invention, since the positioning server corrects the received signal strength of the base station measured by the mobile communication terminal to the transmission signal output value of the base station, the location of the mobile communication terminal is measured by using the corrected received signal strength. When positioning the position of the mobile communication terminal using the has the effect of increasing the positioning accuracy.

Positioning, transmission signal output value, reception signal strength, correction

Description

Server, System and Method for Measuring Position of Mobile Communication Terminal by Using Transmitted Signal Output Value and Received Signal Strength

The present invention relates to network-based positioning servers, systems, and methods that utilize transmit signal output and received signal strength. More particularly, the present invention relates to a server, a system, and a method for positioning a mobile communication terminal in a network-based positioning manner after receiving at least one received signal strength from the mobile communication terminal.

The location measurement service for providing location based service (LBS) is a network based software that uses a radio environment, which is the cell radius of a mobile communication network and a base station, to determine the location of a mobile communication terminal. Based method, handset based method using a GPS (Global Position System) receiver installed in a mobile communication terminal, and a hybrid (hybrid) method in which these two methods are mixed.

Among them, the network-based positioning method transfers the data measured by the mobile communication terminal to the positioning server by using a protocol (IS-801, RRLP, RRC, etc.) between the mobile communication terminal and the server, and uses the measurement data to locate the measurement server. The server performs the location measurement function of the mobile communication terminal. Here, the positioning server performs a network-based position measurement and transmits the result to any one of a server such as a mobile positioning center (MPC), a content provider (CP), etc. and a mobile communication terminal requesting a service.

In the network-based positioning method using the received signal strength, as shown in FIG. 1, the mobile communication terminal measures received signal strength (unit: dB) of pilot signals received from three base stations and transmits them to the positioning server. The positioning server determines the position of the mobile communication terminal at a point where two hyperbolas obtained by calculating a distance difference between base stations through received signal strengths of three base stations.

Here, each base station operates by setting different pilot signal output values, that is, transmit signal output values (unit: dBm) according to the surrounding environment.

Therefore, when positioning the position of the mobile communication terminal using the received signal strength in the conventional positioning server, there is a problem that a positioning error may occur due to different transmission signal output value of each base station.

For example, in FIG. 1, when the mobile communication terminal is actually located in the area where the first base station, the second base station, and the third base station are installed, is the point A and the size of the transmission signal output value of the second base station is the largest, the mobile communication terminal. The magnitude of P2, which is the received signal strength of the second base station, measured by λ is greater than the magnitudes of P1 and P3, which are the received signal strengths of the first and third base stations. Therefore, when positioning the position of the mobile communication terminal using the received signal strength in the positioning server, the positioning server is located in the position of the mobile communication terminal point B, which is close to the second base station rather than near the point A where the mobile communication terminal is located Positioning may increase the possibility of a large positioning error.

In order to solve the above problems, the present invention, after correcting the received signal strength of each base station received from the mobile communication terminal to the transmission signal output value of each base station, and then using the corrected received signal strength to position the position of the mobile communication terminal Its purpose is to provide servers, systems and methods.

In order to achieve the above object, the present invention provides a positioning server for positioning a mobile communication terminal, comprising: a first received signal strength for a first base station, a second received signal strength for a second base station, and a third base station; Receiving a third received signal strength over a mobile communication network, a first transmission signal output value that is a transmission signal output value of the first base station, a second transmission signal output value that is a transmission signal output value of the second base station, and transmission of the third base station A communication unit for receiving a third transmission signal output value, which is a signal output value, from the base station information management server; A data storage unit for storing a reference output value; And calculating the first transmission signal output value, the second transmission signal output value, and the third output value as a first correction value, a second correction value, and a third correction value, respectively, by using the reference output value, and the first correction value. Correct the first received signal strength, correct the second received signal strength with the second correction value, correct the third received signal strength with the third correction value, and then correct the first received signal strength. And positioning a location of the mobile communication terminal by using a second received signal strength and a third received signal strength. Provide a server.

According to another object of the present invention, a mobile communication terminal for measuring and transmitting a first received signal strength for a first base station, a second received signal strength for a second base station, and a third received signal strength for a third base station In the system for positioning the position of the first transmission signal output value of the first base station, the second transmission signal output value of the transmission signal output value of the second base station and the third transmission signal output value of the third base station; A base station information management server for storing and managing base station information including a transmission signal output value; The first received signal strength, the second received signal strength and the third received signal strength transmitted from the mobile communication terminal are received, and the first transmission signal output value and the second transmission signal output value from the base station information management server. And after receiving the third transmission signal output value, the first transmission signal output value, the second transmission signal output value, and the third output value, respectively, using the pre-stored reference output value. Calculate a third correction value, correct the first received signal strength with the first correction value, correct the second received signal strength with the second correction value, and use the third received signal with the third correction value. After the strength is corrected, the positioning is performed to position the mobile communication terminal using the corrected first received signal strength, second received signal strength, and third received signal strength. Burr; And a mobile communication network for mediating data transmission and reception between the mobile communication terminal and the positioning server.

In addition, according to another object of the present invention, in the method for positioning the position of the mobile communication terminal in the positioning server, (a) the first received signal strength, the second received signal strength and the third received signal strength from the mobile communication terminal Receiving; (b) receiving a first transmission signal output value, a second transmission signal output value, and a third transmission signal output value from a base station management server; (c) calculating a first correction value by subtracting a previously stored reference output value from the first transmission signal output value, subtracting the reference output value from the second transmission signal output value, and calculating a second correction value; Calculating a third correction value by subtracting the reference output value from the transmission signal output value; (d) correcting the first received signal strength using the first correction value, correcting the second received signal strength using the second correction value, and using the third correction value. Correcting the received signal strength; And (e) positioning the mobile communication terminal using the corrected first received signal strength, second received signal strength, and third received signal strength. Provides a method for positioning the position of the mobile communication terminal using.

As described above, according to the present invention, after the positioning server corrects the received signal strength of the base station measured by the mobile communication terminal to the transmission signal output value of the base station, the position of the mobile communication terminal is determined using the corrected received signal strength. Therefore, when positioning the position of the mobile communication terminal by using the received signal strength, there is an effect of increasing the positioning accuracy.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a block diagram schematically showing a positioning system according to an embodiment of the present invention.

The positioning system according to the embodiment of the present invention includes a mobile communication terminal 210, a mobile communication network 220, a base station information management server and a positioning server 240.

The mobile communication terminal 210 measures received signal strength, which is the strength of a pilot signal received from a plurality of base stations (not shown) included in the system currently serving, that is, the mobile communication network 220, for each base station, and measures a plurality of measured The first received signal strength, the second received signal strength, and the third received signal strength, which are the top three received signal strengths, are selected from the received signal strengths and then transmitted to the positioning server 240 through the mobile communication network 220. Here, base stations that transmit pilot signals corresponding to the first received signal strength, the second received signal strength, and the third received signal strength are defined as a first base station, a second base station, and a third base station.

In the present invention, when the mobile communication terminal 210 transmits the first received signal strength, the second received signal strength, and the third received signal strength to the positioning server 240, a first base station ID, a second base station ID, and a first base station ID. 3 base station ID is transmitted, of course.

The mobile communication network 220 is a CDMA 2000 network, a wideband code division multiple access (W-CDMA) network, an IS-95 network, a global system for mobile communication (GSM) network, a Wibro network, and future implementations. It includes any one of the next generation mobile communication networks such as the fourth generation mobile communication network.

In the present invention, the mobile communication network 220 mediates data transmission and reception between the mobile communication terminal 210 and the positioning server 240. Here, since the technology for the mobile communication network 220 is a known technology, a detailed description thereof will be omitted.

The base station information management server 230 manages base station information including base station IDs, transmission signal output values, and latitude and longitude information of each of the base stations that exist in the mobile communication service area, that is, the positioning server 240. To transmit.

In other words, the base station information management server 230 according to the embodiment of the present invention is the first transmission signal output value that is the transmission signal output value of the first base station, the second transmission signal output value that is the transmission signal output value of the second base station and the third base station It manages the base station information including the third transmission signal output value of the transmission signal output value of, and transmits it to the positioning server (240).

Here, the base station information management server 230 preferably transmits the first transmission signal output value, the second transmission signal output value, and the third transmission signal output value, that is, the base station information to the positioning server 240 on a daily basis.

The positioning server 240 is a server capable of positioning the position of the mobile communication terminal 210 by using the received signal strength measured by the mobile communication terminal 210. The first receiving signal strength from the mobile communication terminal 210, After receiving the second received signal strength and the third received signal strength, receiving base station information from the base station information management server 230, that is, receiving the first transmitted signal output value, the second transmitted signal output value, and the third transmitted signal output value. The first transmission signal output value, the second transmission signal output value, and the third transmission signal output value are calculated as the first correction value, the second correction value, and the third correction value, respectively, using the previously stored reference output value (unit: dBm). . Here, the positioning server 240 calculates the first correction value by subtracting the reference output value from the first transmission signal output value, calculates the second correction value by subtracting the reference output value from the second transmission signal output value, and the third transmission signal. The third correction value is calculated by subtracting the reference output value from the output value. Here, the unit of the first correction value, the second correction value, and the third correction value obtained by subtracting the reference output value that is the same unit from the first transmission signal output value to the third transmission signal output value having a unit of dBm is equal to the unit of the reception signal strength. The unit is dB.

In the present invention, the size of the reference output value may be set by an administrator of the location server 240 to manage. In other words, the administrator can set the reference output value in consideration of the transmission signal output value of each base station. Here, the reference output value is preferably a value smaller than the smallest transmission signal output value among the transmission signal output values of each base station.

The positioning server 240 that calculates the first to third correction values corrects the first received signal strength with the first correction value, corrects the second received signal strength with the second correction value, and adjusts the third correction value. After correcting the third received signal strength, the position of the mobile communication terminal 210 is measured by using the corrected first received signal strength, second received signal strength, and third received signal strength. Here, the positioning server 240 corrects the first received signal strength by multiplying the first received signal strength by the first correction value, and corrects the second received signal strength by multiplying the second received signal strength by the second correction value, The third received signal strength is corrected by multiplying the third received signal strength by a third correction value. Meanwhile, the unit of the corrected first received signal strength to third received signal strength is dB.

In the present invention, the positioning server 240 preferably positions the position of the mobile communication terminal 210 in a network-based positioning method using the corrected first received signal strength, second received signal strength, and third received signal strength. .

In the present invention, the reason for calculating the first to third correction values, that is, the reason for subtracting the reference output value from the transmission signal output value is that the transmission signal output value has a larger value than the received signal strength, and thus the transmission signal output value as the reference output value. By subtracting, to correct the received signal strength with a correction value similar to or less than the value of the received signal strength.

3 is a block diagram schematically illustrating an internal configuration of a positioning server according to an embodiment of the present invention.

Positioning server 240 according to a preferred embodiment of the present invention includes a data storage unit 310, the communication unit 320 and the control unit 330.

The data storage unit 310 stores a driving program and a reference output value of the positioning server 240.

The communication unit 320 is a network interface connecting a communication path between the mobile communication network 220 and the positioning server 240 and an external device and the positioning server 240, and transmits and receives data with the mobile communication network 220 and the base station information management server ( 230 provides data transmission and reception function.

In other words, the communication unit 320 receives the first received signal strength, the second received signal strength and the third received signal strength transmitted from the mobile communication terminal 210 through the mobile communication network 220, and outputs the first transmission signal output value, The second transmission signal output value and the third transmission signal output value are received from the base station information management server 230.

The controller 330 executes and controls a driving program stored in the data storage unit 310 according to a signal input through a key input unit (not shown), thereby controlling the overall function of the positioning server 240.

In the present invention, the control unit 330 uses the reference output value stored in the data storage unit 310 to convert the first transmission signal output value, the second transmission signal output value and the third transmission signal output value into a first correction value, a second correction value, and Calculating a third correction value, correcting the first received signal strength with the first correction value, correcting the second received signal strength with the second correction value, and correcting the third received signal strength with the third correction value. After that, the position of the mobile communication terminal is measured by using the corrected first received signal strength, second received signal strength, and third received signal strength. Here, the controller 330 calculates the first correction value by subtracting the reference output value from the first transmission signal output value, calculates the second correction value by subtracting the reference output value from the second transmission signal output value, and outputs the third transmission signal output value. The third correction value is calculated by subtracting the reference output value from. In addition, the controller 330 corrects the first received signal strength by multiplying the first received signal strength by the first correction value, and corrects the second received signal strength by multiplying the second received signal strength by the second correction value. The third received signal strength is corrected by multiplying the received signal strength by a third correction value. Meanwhile, the unit of the corrected first received signal strength to third received signal strength is dB.

4 is a flowchart illustrating a process of positioning a position of a mobile communication terminal in a positioning server according to an embodiment of the present invention.

First, the positioning server 240 receives the first received signal strength, the second received signal strength and the third received signal strength from the mobile communication terminal 210, and outputs the first transmitted signal output value and the second received signal from the base station management server 230. The transmission signal output value and the third transmission signal output value are received (S410 and S420).

The positioning server 240 calculates the first correction value by subtracting the previously stored reference output value from the first transmission signal output value, calculates the second correction value by subtracting the reference output value from the second transmission signal output value, and transmits the third transmission. The third correction value is calculated by subtracting the reference output value from the signal output value (S430).

The positioning server 240 having calculated the first correction value, the second correction value, and the third correction value corrects the first received signal strength using the first correction value, and uses the second correction value to determine the second received signal. The intensity is corrected and the third received signal strength is corrected using the third correction value (S440). In other words, the first received signal strength is multiplied by the first correction value to correct the first received signal strength, the second received signal strength is multiplied by the second correction value to correct the second received signal strength, and the third received signal strength is The third received signal strength is corrected by multiplying by a third correction value.

Thereafter, the positioning server 240 positions the position of the mobile communication terminal 210 by using the corrected first received signal strength, second received signal strength, and third received signal strength (S450). Here, the positioning server 240 is a mobile communication terminal 210 in a network-based positioning method (eg, TDOA method) using the corrected first received signal strength, second received signal strength, and third received signal strength. It is preferable to position the position of.

After the step S450, the positioning server 240 requests the positioning service of the mobile communication terminal 210 and the server such as a mobile positioning center (MPC), a content provider (CP), etc. To transmit.

5 is a diagram illustrating a result for measuring the position of the mobile communication terminal in the positioning server according to an embodiment of the present invention by way of example.

When positioning the location of the mobile communication terminal 210 by performing the positioning process as shown in Figure 4 in the positioning server 240, the positioning server 240 is the same as or close to the point A, the actual location of the mobile communication terminal 210 Since positioning is performed, it is possible to increase positioning accuracy than when positioning a location of the mobile communication terminal 210 using only received signal strength.

In FIG. 5, P1, P2, and P3 mean a first received signal strength, a second received signal strength, and a third received signal strength, and T1, T2, and T3 indicate a first transmit signal output value, a second transmit signal output value, and a third Means a transmission signal output value, and r means a reference output value.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. 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, the present invention is applied to the location-based service field, and after the positioning server corrects the received signal strength of the base station measured by the mobile communication terminal to the transmission signal output value of the base station, it moves using the corrected received signal strength. Since the location of the communication terminal is located, it is a very useful invention to generate the effect of increasing the positioning accuracy when positioning the location of the mobile communication terminal using the received signal strength.

1 is a diagram illustrating a result for measuring a position of a mobile communication terminal by using a received signal strength in the prior art;

2 is a block diagram schematically showing a positioning system according to an embodiment of the present invention;

3 is a block diagram schematically showing an internal configuration of a positioning server according to an embodiment of the present invention;

4 is a flowchart illustrating a process of positioning a location of a mobile communication terminal in a positioning server according to an embodiment of the present invention;

5 is a diagram illustrating a result for measuring the position of the mobile communication terminal in the positioning server according to an embodiment of the present invention.

Description of the Related Art

210: mobile communication terminal 220: mobile communication network

230: base station information management server 240: positioning server

310: data storage unit 320: communication unit

330: control unit

Claims (7)

In the positioning server for positioning the position of the mobile communication terminal, Receiving a first received signal strength for a first base station, a second received signal strength for a second base station, and a third received signal strength for a third base station through a mobile communication network, and being a transmission signal output value of the first base station. A communication unit which receives a first transmission signal output value, a second transmission signal output value of the transmission signal output value of the second base station, and a third transmission signal output value of the transmission signal output value of the third base station from the base station information management server; A data storage unit for storing a reference output value; And The first transmission signal output value, the second transmission signal output value, and the third output value are respectively calculated as a first correction value, a second correction value, and a third correction value using the reference output value, and the first correction value is calculated as the first correction value. Correcting the first received signal strength, correcting the second received signal strength with the second correction value, correcting the third received signal strength with the third correction value, and then correcting the first received signal strength, A control unit for positioning the position of the mobile communication terminal using the second received signal strength and the third received signal strength The server for positioning the position of the mobile communication terminal using a transmission signal output value and the received signal strength, characterized in that it comprises a. The method of claim 1, The control unit calculates the first correction value by subtracting the reference output value from the first transmission signal output value, calculates the second correction value by subtracting the reference output value from the second transmission signal output value, and the third And calculating the third correction value by subtracting the reference output value from the transmission signal output value to determine the position of the mobile communication terminal using the transmission signal output value and the received signal strength. The method of claim 1, The control unit corrects the first received signal strength by multiplying the first received signal strength by the first correction value, and corrects the second received signal strength by multiplying the second received signal strength by the second correction value. And correcting the third received signal strength by multiplying the third received signal strength by the third correction value to determine the location of the mobile communication terminal using the transmission signal output value and the received signal strength. A system for positioning a mobile communication terminal for measuring and transmitting a first received signal strength for a first base station, a second received signal strength for a second base station, and a third received signal strength for a third base station, Storing base station information including a first transmission signal output value of the transmission signal output value of the first base station, a second transmission signal output value of the transmission signal output value of the second base station, and a third transmission signal output value of the transmission signal output value of the third base station; And a base station information management server for managing. The first received signal strength, the second received signal strength and the third received signal strength transmitted from the mobile communication terminal are received, and the first transmission signal output value and the second transmission signal output value from the base station information management server. And after receiving the third transmission signal output value, the first transmission signal output value, the second transmission signal output value, and the third output value, respectively, using the pre-stored reference output value. Calculate a third correction value, correct the first received signal strength with the first correction value, correct the second received signal strength with the second correction value, and use the third received signal with the third correction value. After the strength is corrected, the positioning is performed to position the mobile communication terminal using the corrected first received signal strength, second received signal strength, and third received signal strength. Burr; And A mobile communication network for transmitting and receiving data between the mobile communication terminal and the positioning server System for positioning the position of the mobile communication terminal using the transmission signal output value and the received signal strength, characterized in that it comprises a. The method of claim 4, wherein The positioning server is a system for positioning the position of the mobile communication terminal using the transmission signal output value and the received signal strength, characterized in that for positioning the position of the mobile communication terminal in a network-based positioning method. In the method of positioning the position of the mobile communication terminal in the positioning server, (a) receiving a first received signal strength, a second received signal strength, and a third received signal strength from the mobile communication terminal; (b) receiving a first transmission signal output value, a second transmission signal output value, and a third transmission signal output value from a base station management server; (c) calculating a first correction value by subtracting a previously stored reference output value from the first transmission signal output value, subtracting the reference output value from the second transmission signal output value, and calculating a second correction value; Calculating a third correction value by subtracting the reference output value from the transmission signal output value; (d) correcting the first received signal strength using the first correction value, correcting the second received signal strength using the second correction value, and using the third correction value. Correcting the received signal strength; And (e) positioning the mobile communication terminal using the corrected first received signal strength, second received signal strength, and third received signal strength; And positioning the location of the mobile communication terminal using the transmission signal output value and the reception signal strength. The method of claim 6, (f) transmitting a positioning result of the mobile communication terminal to a server requesting a positioning service or a mobile communication terminal requesting the positioning service; And positioning the location of the mobile communication terminal by using the transmission signal output value and the reception signal strength.

Images