KR101624168B1 - System, Location Detecting Server and Method for Constructioning of Pilot Cell Database - Google Patents

Abstract

The present invention relates to a pilot cell database construction system, a location measurement server and method, and more particularly, to a pilot cell database construction system, a location measurement server, The distance between the current position of the portable terminal and the reference base station currently serving the portable terminal, the distance of the adjacent base station existing at a distance close to the current position, and the current position, And by constructing the pilot cell database, the accuracy of the position measurement for the mobile terminal can be improved.

Frequency pattern, pCell, database, pilot cell, DB construction

Description

Field of the Invention [0001] The present invention relates to a pilot cell database construction system, a location measurement server,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for constructing a pilot cell database and a method for constructing a pilot cell database at a current position using data on pilot cells related to a neighbor base station having a frequency pattern similar to a reference base station A pilot cell database construction system, a location measurement server, and a method.

Among various wireless Internet services using a mobile communication terminal, a location based service (LBS) is a service that has been greatly appreciated for its wide applicability and convenience. The location-based service refers to a communication service that grasps the location of a mobile terminal including a mobile communication terminal and a PDA (Personal Digital Assistant), and provides additional information related to the detected location.

Such location based services can be used in various fields such as rescue request, response to crime report, geographical information system of neighboring area information, traffic information, vehicle navigation and logistics control.

However, there is a disadvantage in that it is difficult to collect the current location information of the portable terminal from the portable terminal when the portable terminal is located in a place such as a shade area or a building, in the conventional location information collection method for location-based services. In order to solve this problem, a location information database for the shaded area must be constructed in advance.

However, in order to construct such a system, it is troublesome to manually collect various data by visiting a shadow area, and it takes a lot of time to collect various data.

In order to solve such conventional problems, it is an object of the present invention to provide a pilot cell database construction system for building a pilot cell database at a current location with pilot cell data related to a neighbor base station having a frequency pattern similar to that of a reference base station, , A location server and method.

Another object of the present invention is to provide a pilot cell database for a reference base station based on the current position of the mobile terminal, the distance of the reference base station currently serving the mobile terminal, the distance of the neighbor base station existing at a distance close to the current position, A location measurement server, and a method for establishing a pilot cell database at a current position by determining a distance between the mobile terminal and the mobile terminal.

In order to achieve the above object, a pilot cell database construction system according to the present invention receives a current location information of the mobile terminal, a message including data for a reference base station and a plurality of neighboring base stations currently serving in the mobile terminal, A data analysis server for receiving the message from the data analysis server, extracting current location information of the mobile terminal, receiving the message from the data analysis server, And a location measurement server for constructing a pilot cell database with pilot cell data associated with the neighbor base station if data for the base station is present in the message.

In addition, the location measurement server according to the present invention receives a current location information of the mobile terminal, a message including data on a reference base station and a plurality of neighboring base stations serving the mobile terminal, A condition determining unit for determining whether a neighboring base station having a frequency pattern similar to a frequency pattern of the reference base station currently serving to the mobile station is present at the position among a plurality of neighbor base stations included in the message, And a DB constructing unit for constructing a pilot cell database with pilot cell data related to the neighbor base station if a neighbor base station having a frequency pattern similar to the frequency pattern of the reference base station exists in the message as a result of the determination of the condition determining unit.

The condition determining unit may determine whether the current position and the reference base station distance are equal to or greater than a first threshold value, and provide the determination result to the DB building unit.

The condition determining unit may determine whether the distance between the current location and the current location of the pilot cell database including the reference BS is greater than or equal to a second threshold value, and provide the determination result to the DB building unit.

The condition determining unit may determine whether a distance between the adjacent base stations and a neighboring base station close to the current location is less than the first threshold and is greater than or equal to the second threshold and provides the determination result to the DB building unit .

In addition, the DB construction unit constructs a pilot cell database with pilot cell data associated with the neighbor base station if the neighbor base stations included in the message satisfy the determination condition according to the determination result provided by the condition determination unit .

The apparatus may further include a database for storing a pilot cell database constructed by the DB building unit.

According to another aspect of the present invention, there is provided a method of establishing a pilot cell database, the method comprising the steps of: requesting a position of the mobile terminal to a data analysis server to measure a current position of the mobile terminal; Receiving a message including current location information of the mobile terminal and data of a reference base station and a plurality of neighboring base stations serving the mobile terminal from the mobile terminal, Determining whether data for a neighbor base station having a frequency pattern similar to a frequency pattern of a reference base station currently serving to the mobile terminal exists in the message at the location, , The frequency pattern of the reference base station If the data for the adjacent base station having a similar frequency patterns are present in the message it comprises the steps of building a database with the pilot cell pilot cell data in association with the neighbor BS.

As described above, according to the present invention, by constructing a pilot cell database at a current position with pilot cell data related to a neighbor base station having a frequency pattern similar to that of a reference base station serving in the mobile terminal, it is possible to improve the accuracy of position measurement for the mobile terminal It is effective.

Also, according to the present invention, a pilot cell database for the reference base station is constructed based on the current position of the portable terminal, the distance of the reference base station currently serving the portable terminal, the distance of the adjacent base station existing at a distance close to the current position, The accuracy of the position measurement for the mobile terminal can be improved by constructing the pilot cell database at the current position by determining the distance.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the exemplary embodiments of the present invention, a description of technologies that are well known in the art and not directly related to the present invention will be omitted. This is to omit the unnecessary description so as to convey the key of the present invention more clearly without fading.

In the present invention, a portable terminal is a terminal for providing a location based service to a user, and can be used in place of a mobile communication terminal, a mobile phone, a personal digital assistant (PDA), and a smart phone. In addition, in the present invention, the portable terminal is exemplified as an All-IP based terminal, but it is preferable that the portable terminal does not depend on a communication method such as a terminal based on CDMA, WCDMA or GSM.

1 is a configuration diagram showing a main configuration of a pilot cell database construction system according to an embodiment of the present invention. 2 is a block diagram showing a main configuration of the position measurement server shown in FIG.

1 and 2, a pilot cell database construction system 10 according to an embodiment of the present invention includes a portable terminal 100, a quality acquisition server 110, a communication network 120, a data analysis server 130, And a location measurement server 140.

The mobile terminal 100 sets up traffic with the data analysis server 130 via the communication network 120 to use the network-based location-based service.

Particularly, the portable terminal 100 transmits data related to the quality of the pilot cell pCell currently providing the service (i.e., the number of the portable terminal 100, the identification number of the base station where the portable terminal 100 is located, To the quality acquisition server 110, and receives a triggering message from the data analysis server 130. The quality analysis server 110 receives the triggering message from the quality analysis server 110, Upon receiving the triggering message, the mobile terminal 100 measures its current position while transmitting / receiving the first message to / from the data analysis server 130 using the traffic set up with the data analysis server 130. At this time, when the portable terminal 100 is in an in-building environment, the portable terminal 100 can not receive the GPS signal, so that the portable terminal 100 requests the HSS 122 of the communication network 120 to transmit the position / do.

At this time, the first message means a message by a positioning protocol corresponding to the communication method. That is, in the synchronous Code Division Multiple Access (CDMA) scheme, the first message is a message based on the IS-801 protocol, the asynchronous WCDMA scheme, the first message is a message based on the RRLP protocol, In the global system for mobile communication (GSM), which is a mobile communication system, a message according to the RRC protocol is applied to the first message.

In addition, the portable terminal 100 generates a second message including current position information to which the portable terminal 100 belongs. Then, the mobile terminal 100 transmits the second message to the data analysis server 130 using the traffic set up with the data analysis server 130. At this time, the portable terminal 100 transmits the position / hardness coordinate information received from the HSS 122 to the data analysis server 130 in the second message.

At this time, the second message is a message similar to the pilot phase measurement message in the CDMA system, and includes the information of the currently serving system, the pilot signal of the adjacent base station, and the strength (Ec / lo) of the signal. The information of the current service system includes a mobile communication system number, a mobile communication network number, a base station number, a serving base station sector number (REF_PN, hereinafter referred to as a reference base station), and a pilot phase in a reference base station. Also, the pilot signal of the adjacent base station includes distance data and time data such as a number (PN) of adjacent base station sectors collected from the portable terminal 100, a pilot phase in each adjacent base station, a signal strength, .

In addition, the second message is a pilot phase measurement (PPM) message used in the IS-801 protocol in the CDMA system, a message used in the RRLP protocol in the WCDMA system, and a message used in the RRC protocol in the GSM system.

The quality acquisition server 110 acquires data related to the service quality of the pilot cell including the reference base station currently providing the service from the mobile terminal 100 to the mobile terminal 100. [ Particularly, the quality obtaining server 110 stores the number of the mobile terminal 100, the identification number of the base station where the mobile terminal 100 is located, the latitude and longitude coordinates of the location where the mobile terminal 100 is currently located, 100 to the location measurement server 140 and requests the location measurement server 140 to measure the location of the mobile terminal 100.

The communication network 120 includes a General Packet Radio Service (GPRS) 121, a Home Subscriber Server (HSS) 122 and a Call State Control Function (CSCF) 123 and is wirelessly connected to the mobile terminal 100 The mobile terminal 100 performs various functions for performing a mobile communication service such as a voice communication service, a wireless data service, or a wireless Internet service message service.

The GPRS 121 performs a connection function between the communication network 120 and the external packet data network and performs a data packet transfer function with the base station in the service area. The gateway GPRS support node (GGSN) and the Serving GPRS Support Node (SGSN) ).

The HSS 122 is a database for storing a service profile related to mobile communication subscriber information. The HSS 122 stores the service profile of the mobile communication subscriber information, such as MIN, Mobile Identification Number (ESN), Electronic Serial Number (ESN) And stores the subscriber information.

CSCF 123 is responsible for the call and session processing related portions. That is, the CSCF performs a call control function, a SPD (Serving Profile Database) function, and an address processing function for signals that are respectively input to different CSCFs.

The data analysis server 130 transmits the triggering message to the mobile terminal 100 via the communication network 120 in response to the location measurement request of the mobile terminal 100 received from the location measurement server 140. The data analysis server 130 receives the second message from the mobile terminal 100 via the communication network 120 and transmits the received second message to the location measurement server 140. [

At this time, the data analysis server 130 applies PDE (Position Determination Entity) in the CDMA system, PS (Position Server) in the WCDMA system, and Serving Mobile Location Center (SMLC) in the GSM system.

The location measurement server 140 constructs and stores a pilot cell database. The location measurement server 140 includes a location extracting unit 141, a condition determining unit 142, a DB establishing unit 143, and a database 144.

At this time, the pilot cell database is a database in which a location measurement service area is divided into grid units of a predetermined size, each grid is defined as a pilot cell, and an ID having unique information is assigned. The unique information of the pilot cell ID can be the top / longitude data of the center point of each lattice, the top / longitude data of the four corners of the lattice, and the size of the lattice can be divided into 100X100m, 50X50m, 25X25m, etc. according to the measurement accuracy specification have.

The position extracting unit 141 extracts the current position of the mobile terminal 100 from the position and hardness coordinate information of the mobile terminal 100 included in the second message received from the data analysis server 130, ) Is located in the base station.

Based on the second message received from the data analysis server 130, the condition determination unit 142 extracts data on the reference base station providing the service to the mobile terminal 100, distance data of the neighbor base stations and time data, do. The condition determiner 142 determines the distance between the base station corresponding to the current location of the mobile terminal 100 and the reference base station providing the service to the mobile terminal 100, It is determined whether or not the distance to the adjacent base station close to the near distance and the distance between the current location and the established pilot cell database satisfy a specific condition.

More specifically, when the distance of the reference base station providing the service to the mobile terminal 100 in the base station corresponding to the current position is equal to or greater than the first threshold (for example, 500 m) And provides a determination result to the DB building unit 143 to build the pilot cell database with the pilot cell data related to the reference base station.

If the distance to the neighboring base station closest to the base station corresponding to the current position is equal to or greater than the second threshold value (for example, 300 m) and is less than the first threshold value, And provides the DB construction unit 143 with the determination result to construct the pilot cell database with the pilot cell data related to the adjacent base station.

If the distance between the pilot cell database and the current position is equal to or greater than the second threshold value, the condition determination unit 142 determines the pilot cell database at the current location as a pre-built pilot cell database, And provides it to the building unit 143. At this time, it is preferable that the base station and the reference base station corresponding to the current position are constructed by key.

Accordingly, the location measurement server 140 can improve the accuracy of the location measurement of the portable terminal 100 by constructing the pilot cell database using the data that has been recognized and erased as data that is conventionally unnecessary.

In addition, the condition determination unit 142 determines whether adjacent base stations having frequency patterns similar to those of the reference base station among the neighbor base stations included in the second message are continuously collected. As a result of the determination, if there is a neighbor base station having a frequency pattern similar to the frequency pattern of the reference base station, the pilot cell database can be constructed using only the pilot cell data associated with the neighbor base station.

The condition determiner 142 can construct the pilot cell database using only the pilot cell data related to the neighboring base station satisfying any one of the three conditions among the neighbor base stations having similar frequency patterns. As a result, the location measurement server 140 can establish a database that is more accurate and accurate at the time of building the pilot cell database by setting the conditions for building the pilot cell database in detail.

If the data included in the second message satisfies the determination condition according to the determination result of the condition determination unit 142, the DB building unit 143 constructs the pilot cell database with data satisfying the determination condition.

The database 144 stores the pilot cell database built in the DB construction unit 143. [

3 is a flowchart illustrating a method of constructing a pilot cell database according to an embodiment of the present invention. 4 is a diagram illustrating a message received from a mobile terminal by a location measurement server for establishing a pilot cell database according to an embodiment of the present invention. FIG. 5 is a diagram for explaining a construction of a pilot cell database according to an embodiment of the present invention.

3 to 5, the mobile terminal 100 transmits data related to the pilot cell quality to the quality acquisition server 110 in step S301. The quality acquisition server 110 receives the number of the mobile terminal 100 and the identification number of the base station where the mobile terminal 100 is located from the mobile terminal 100 in step S302, And requests the location measurement of the portable terminal 100. [

In step S303, the location measurement server 140 requests the data analysis server 130 to measure the location of the mobile terminal 100. The data analysis server 130 receives the triggering message from the mobile terminal 100 in step S304, .

At this time, the triggering message instructs the portable terminal 100 to perform position measurement so that the portable terminal 100 can acquire positional information of the place where the portable terminal 100 is currently located.

Then, in step S305, the mobile terminal 100 transmits and receives a positioning protocol message (first message) according to the communication method with the data analysis server 130, and in step S306, the mobile terminal 100 measures a position . In this case, when the portable terminal 100 is in an in-building environment, the portable terminal 100 can not directly receive the GPS signal, and thus the portable terminal 100 can transmit the GPS signal to the HSS 122 of the communication network 120, Information can be requested and coordinates of the place where the user is currently located can be received.

In step S307, the mobile terminal 100 generates a second message including current location information to which the mobile terminal 100 belongs, and transmits the second message to the data analysis server 130 using the traffic set up with the data analysis server 130. [

At this time, the second message may include position / hardness coordinate information received from the HSS 122 by the mobile terminal 100. In the second message, the mobile communication system number currently serving for each pilot cell, A reference number of the reference base station currently serving in the current location, a neighbor list of neighbor base stations of the reference base station, distance data and time data of neighbor base stations located close to the reference base station, the strength (Ec / lo) .

In the present invention, the second message includes the positional / longitudinal coordinate information of the portable terminal 100, and the second message is transmitted to the data analysis server 130. However, since the positional / And the second message may be transmitted to the data analysis server 130, respectively.

In step S308, the data analysis server 130 transmits the second message received from the mobile terminal 100 to the location measurement server 140. [ In step S309, the location measurement server 140 extracts and confirms the current location of the mobile terminal 100 included in the second message, and extracts the identification number of the base station corresponding to the current location. In step S309, the location measurement server 140 transmits data related to the reference BS, which is included in the second message, to the current location of the mobile terminal 100, The time data, and the like.

In step S310, the location measurement server 140 determines whether the distance from the base station corresponding to the current location included in the second message to the reference base station providing the service to the mobile terminal 100 is equal to or greater than a first threshold (e.g., 500 m) do. If it is determined in step S310 that the distance between the base station corresponding to the current position of the mobile terminal 100 and the reference base station is equal to or greater than the first threshold value, the position measurement server 140 proceeds to step S313. .

In step S311, the location measurement server 140 determines whether the distance from the neighboring base station that is closest to the base station corresponding to the current location is greater than or equal to a second threshold (e.g., 300 m) and less than the first threshold. As a result of the determination in step S311, if the distance between the base station corresponding to the current location and the neighboring base station closest to the current location is equal to or greater than the second threshold value and less than the first threshold value, the location measurement server 140 proceeds to step S313. .

In step S312, the location measurement server 140 determines whether the distance between the current location and the pilot cell database that is closest to the current location is equal to or greater than a second threshold value. As a result of the determination in step S312, the location measurement server 140 proceeds to step S313 if the location of the pilot cell database closest to the current location is equal to or greater than the second threshold, and proceeds to step S314 if the location is below the second threshold. At this time, it is preferable that the base station and the reference base station corresponding to the current position are constructed by key.

In addition, the second message may be represented as shown in FIG. 4 in steps S310 to S312. Reference numeral 410 in FIG. 4 denotes a reference base station providing service to the mobile terminal 100, and PN 1, PN 2, and PN 7 denote neighbor base stations adjacent to the REF PN. At this time, although there are various data in the second message, only the base station is displayed for convenience of explanation.

Also, if the second message received after 410 is equal to 420, the mobile terminal 100 can recognize that it exists in the handoff region of REF PN and PN 1.

Conventionally, only when the data included in the second message does not satisfy the above-mentioned conditions, it is determined that the data is reliable, and the pilot cell database is created, and all the other data are erased. However, according to the present invention, the location of the portable terminal 100 can be measured in more detail by collecting all the data on the neighbor base stations included in the second message and constructing the pilot cell database where the portable terminal 100 is located.

Thereafter, in step S313, if the data included in the second message satisfy the above conditions, the location measurement server 140 determines whether there exists a neighbor BS having a frequency pattern similar to that of the reference BS, .

If it is determined in step S313 that a neighbor BS having a frequency pattern similar to that of the reference BS is present among the data included in the second message, the POS server 140 proceeds to step S314, And builds a pilot cell database with the related pilot cell data. However, the present invention is not limited to this. However, the present invention is not limited to this case even if S313 and S312 are performed after S313, I will clarify.

More specifically, as shown in FIG. 5, the area A represents a second threshold value, that is, an area within 300 m, based on the location of the portable terminal 100, and the area B represents 300 m From the above, a first threshold value, that is, an area within 500 m is shown. The C region indicates a region of 500 m or more based on the location of the portable terminal 100.

At this time, the mobile terminal 100 can receive a service from a base station 502 (hereinafter referred to as a reference base station) existing in the C region. In this case, since the pilot cell database corresponding to the reference base station 502 does not exist in the pilot cell database existing in the area A where the actual portable terminal 100 is located, the frequency pattern similarity . Therefore, a large error occurs between the current position and the measured position of the portable terminal 100, which may degrade the accuracy of the measurement of the position of the portable terminal 100. [ Therefore, the location measurement server 140 constructs a pilot cell database in area A with data on the pilot cell related to the reference base station 502.

In FIG. 5, a base station 503 in a region B represents a neighbor base station 503 located at a shortest distance from the current position of the mobile terminal 100. The location measurement server 140 determines whether the distance between the base station corresponding to the current location and the adjacent base station 503 is equal to or greater than a second threshold value (for example, 300 m), and is less than the first threshold value. As a result of the determination, when the distance between the current location and the adjacent base station 503 falls within the B area, the location measurement server 140 constructs a pilot cell database in the A area with data on the pilot cell associated with the neighboring base station 503 .

5, when the pilot cell database located nearest to the current position of the mobile terminal 100 exists at 300 m or more from the current location, the location measurement server 140 searches the area A for the pilot cell database Build a cell database.

Even if the location server 140 receives a service through the reference base station 503 located at a position far from the current location of the portable terminal 100, The pilot cell database is constructed in the area A by using the information of the pilot cell related to the adjacent base station 502 having a frequency pattern similar to the frequency pattern of the reference base station 503. [ Accordingly, the mobile terminal 100 can receive the service from the base station corresponding to the base station data existing in the pilot cell database established at the current location, without receiving the service through the reference base station 503 located at a remote location Therefore, the current position of the portable terminal 100 can be measured more accurately.

While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

The present invention can be applied to a location measurement service of a mobile terminal. In particular, a mobile terminal collects neighbor base stations close to a reference base station receiving a service, and constructs a pilot cell database with pilot cell data related to the neighbor base stations, Location measurement service can be provided.

1 is a configuration diagram showing a main configuration of a pilot cell database construction system according to an embodiment of the present invention;

2 is a block diagram showing a main configuration of the position measurement server shown in Fig. 1

3 is a flowchart showing a method of constructing a pilot cell database according to an embodiment of the present invention

4 is an exemplary diagram illustrating a message received from a mobile terminal by a location measurement server for establishing a pilot cell database according to an embodiment of the present invention.

5 is a diagram illustrating an example of a screen for explaining the construction of a pilot cell database according to an embodiment of the present invention.

DESCRIPTION OF THE EMBODIMENTS

100: portable terminal 110: quality acquisition server

120: Network 121: GPRS

122: HSS 123: CSCF

130: Data Analysis Server 140: Location Measurement Server

141: position extracting unit 142: condition judging unit

143: DB construction unit 144: Database

Claims (8)

delete A location extracting unit for extracting current location information of the mobile terminal by receiving a current location information of the mobile terminal and a message including data on a reference base station and a plurality of neighboring base stations serving the mobile terminal from the mobile terminal; A distance between the current position of the portable terminal and the reference base station, a distance between adjacent base stations of the plurality of neighbor base stations adjacent to the current position of the portable terminal, a distance between areas mapped to the pilot cell database including the reference base station, A threshold value comparing unit for comparing at least one of the plurality of threshold values with a predetermined threshold value and providing the determination result to the DB building unit; A DB construction unit for constructing a pilot cell database according to a result of the determination by the condition determination unit; And a location server. 3. The method of claim 2, The condition determination unit Determining whether a first condition is satisfied if the distance between the current location of the portable terminal and the reference base station is equal to or greater than a first threshold and if the first condition is satisfied, To the DB construction unit. The method of claim 3, The condition determination unit Determining a second condition that a distance between a current position of the portable terminal and a neighboring base station close to a current position of the portable terminal is less than or equal to the first threshold and is greater than or equal to a second threshold if the first condition is not satisfied, When the condition is satisfied, provides a determination result to the DB building unit to build a pilot cell database with pilot cell data related to the neighbor base station. 5. The method of claim 4, The condition determination unit Determining whether a distance between a current location of the portable terminal and a region mapped to a pilot cell database including the reference base station is equal to or greater than the second threshold value if the second condition is not satisfied, 3 < / RTI > condition is satisfied, provides a determination result to the DB building unit to build a pilot cell database with the pilot cell database constructed in advance. delete 3. The method of claim 2, A database for storing a pilot cell database constructed by the DB building unit; Further comprising a location server for receiving location information from the location server. Receiving location information of a current location of the mobile terminal from a mobile terminal and a message including data of a reference base station and a plurality of neighboring base stations currently serving the mobile terminal; The location server extracting current location information of the portable terminal included in the message; The location server measures a distance between a current location of the mobile terminal and the reference base station, a distance between neighboring base stations adjacent to the current location of the mobile terminal among the plurality of neighbor base stations, Comparing at least one of distances between regions mapped to the database to a predetermined threshold; And Constructing a pilot cell database according to a result of the comparison based on the comparison; The method comprising the steps of:

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