KR20100035244A - Server and method for building pcell database improving determination accuracy - Google Patents

Abstract

PURPOSE: A server and method for building pCell database improving determination accuracy are provided to accurately position the pCell of a mobile communication terminal by storing a reference PN and an adjacent PN as a reference PN. CONSTITUTION: A communication unit(510) offers a data transceiving function to a positioning server. A controller(520) receives a PPM(Pilot Phase Measurement) data and a latitude/longitude data through a communications unit from the positioning server. If a plurality of active PNs(Pseudo Noise) are included in PPM data, the controller establishes a plurality of active PNs as a plurality of reference PN information of the pCell coping in the pCell database. A SNR(Signal to Noise Ratio) of an active PN is over constant reference value.

Description

Server and Method for Building pCell Database Improving Determination Accuracy}

The present invention relates to a server and method for building a pCell database that improves positioning accuracy. More specifically, the present invention relates to a system, server, and method for constructing a pCell database using PPM (Pilot Phase Measuremtnt) data and latitude / longitude data measured by a mobile communication terminal, and using the same to determine the location of the mobile communication terminal. .

The network-based positioning method using the pCell database is a positioning method to complement a hybrid method including a network-based method, a handset based method and a network-based method and a handset-based method, which are existing location measurement technologies. In the same manner as in FIG. 1, the position of the terminal is determined.

First, in order to determine the location of the corresponding terminal using a network-based positioning method using the pCell database, the pCell positioning server constructs a pCell database in which the location measurement service area is divided into grid units of a predetermined size (S110). It continuously checks whether a positioning request has occurred from the subscriber station which is the subscriber's mobile communication terminal (S120).

When the positioning request is generated from the subscriber station, the location calculation server receives pilot phase measurement (PPM) data received from the subscriber station from the location calculation server, compares the PPM data with the pCell database, determines a matched pCell, and then locates the location. The location measurement result is transmitted to the location based service platform (LBSP) which is used as a measurement result, that is, location based service (S130). Here, the position calculation server is a position determining entity (PDE) in synchronous code division multiple access (CDMA) scheme, a position server (PS) in asynchronous band code division multiple access (W-CDMA) scheme, and a European time division mobile communication system. In the Global System for Mobile Communication (SMG) scheme, a Serving Mobile Location Center (SMLC) is applied.

The conventional method for building a pCell database in step S110 of FIG. 1 is the same as that of FIG. 2.

2 is a flow chart illustrating a conventional method for building a pCell database.

First, in order to construct a pCell database, a location service target area is divided into grid units having a predetermined size as shown in FIG. 3, and each grid is defined as a pCell to give ID (IDentification) having unique information (S210). Here, the unique information of the pCell ID may be latitude and longitude data (hereinafter, referred to as 'latitude and longitude data') of the center point of each grid, and latitude and longitude data of all four vertices. Here, the size of the grid may be divided into 100 × 100m, 50 × 50m, 25 × 25m, etc. service target area according to the required positioning accuracy specifications.

The positioning result for each pCell ID is collected (S220). Here, the positioning result is PPM (Pilot Phase Measurement) data received by the location calculation server from the mobile communication terminal and latitude-longitude data which is a call positioning result (A-GPS or network-based positioning result), that is, the area where the mobile communication terminal is located. Latitude and longitude data of.

A required parameter is extracted from the positioning result for each collected pCell ID to construct a pCell database (S230).

As described above, the pCell database constructed by the pCell positioning server has a mobile communication system ID (SID: System ID), a mobile communication network ID (NID: Network ID), and a base station ID (Base-ID) for each pCell ID, that is, for each pCell. ), Including reference PN (Ref_PN) information and one or more adjacent measurement PN (PN) information, and one reference PN information for each pCell ID.

Accordingly, when any one of one or more active noise (PN) is performed by the pCell positioning server for a pCell positioning of a subscriber station located in a handoff border area between base stations, which may be a reference PN of PPM data, the pCell positioning server may be used. The reference PN included in the PPM data may be inconsistent with the reference PN information of the pCell corresponding to the region (handoff border region) where the subscriber station is located in the pCell database. For example, the subscriber station is located in the handoff border area of the base station A, the base station B, and the base station C (when the active PN received by the subscriber station is the PN of the A base station, the PN of the B base station, and the PN of the C base station). In the PPM data collected by the subscriber station, the PN of the A base station is included as the reference PN, whereas the PCell database of the pCell corresponding to the handoff border region may include the PN of the B base station as the reference PN information.

In this case, the pCell positioning server includes a pCell including the reference PN included in the PPM data as the reference PN information in the pCell database, that is, the propagation pattern of the reference PN and PPM data of the PPM data in an area farther than the region where the subscriber station is actually located. Searching for a similar pCell and providing corresponding latitude and longitude information as a positioning result causes a larger positioning error than a general pCell positioning error, thereby degrading pCell positioning accuracy in the handoff border region.

In order to solve the above-described problem, the present invention provides a plurality of active PNs in a pCell database when a plurality of active PNs having a signal-to-noise ratio of a predetermined reference value or more exist in PPM data corresponding to predetermined latitude and longitude data when constructing a pCell database. An object of the present invention is to provide a server and a method for setting a plurality of reference PN information of a pCell corresponding to predetermined latitude and longitude data.

In order to achieve the above object, the present invention provides a server for constructing a pCell database, comprising: a communication unit for providing a data transmission / reception function with a location calculation server; And receiving PPM (Pilot Phase Measurement) data and latitude-longitude data from the position calculation server through the communication unit, and the plurality of active PNs having a signal-to-noise ratio of a predetermined reference value or more are included in the PPM data. And a control unit configured to set the active PN of the pCell database to a plurality of pieces of reference PN information of the pCell corresponding to the latitude and longitude data in the pCell database.

According to another object of the present invention, in the method for building a pCell database in the pCell positioning server, (a) receiving the PPM data and latitude-longitude data from the position calculation server, the active PN ( Checking whether a plurality of pseudo noises are included in the PPM data; And (b) if the PPM data includes a plurality of active PNs, setting the plurality of active PNs as a plurality of reference PN information of a pCell corresponding to latitude and longitude data in the pCell database. It provides a method for building a pCell database that improves the positioning accuracy.

As described above, according to the present invention, the pCell positioning server uses not only the reference PN of the PPM data but also the adjacent PN corresponding to the active PN as the reference PN in the pCell database for the handoff border area between the base stations where the plurality of active PNs exist. Because of the storage, the pCell positioning of the mobile communication terminal located in the handoff border region can be accurately performed.

Hereinafter, exemplary 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.

Figure 4 is a block diagram showing a brief configuration of the pCell positioning system according to an embodiment of the present invention.

The pCell positioning system according to an embodiment of the present invention includes a location calculation server 410 and a pCell positioning server 420.

When the location calculation server 410 receives the location location request from the pCell location server 420, requests the mobile communication terminal (not shown) to collect PPM data, and receives the PPM data from the mobile communication terminal (not shown). PPM data and latitude-longitude data of an area where a mobile communication terminal (not shown) is located are provided to the pCell positioning server 420.

In addition, the location calculation server 410 provides the PCell positioning server 420 with PPM data and latitude-longitude data for each pCell ID when the pCell positioning server 420 constructs the pCell database. Here, the latitude and longitude data is latitude and longitude data of a region where a mobile communication terminal (not shown) in which PPM data is measured is located.

Here, the PPM data includes a system ID (SID), a mobile communication network ID (NID), a base station ID (BS-ID), a reference PN (Ref_PN), which is a sector number of a currently serving base station, and a pilot in the reference PN. Phase and signal-to-noise ratios, adjacent PNs (Measurement PNs), which are sector numbers of adjacent base stations, pilot phases and signal-to-noise ratios within each adjacent PN.

The pCell positioning server 420 constructs and stores a pCell database, and when receiving a pCell positioning request from a mobile communication terminal (not shown) which is a subscriber station, the PCell data of the mobile communication terminal (not shown) from the location calculation server 410. Receive, extract location-related location data and compare it with the pCell database. Here, the pCell positioning server 420 selects a pCell having the most matching PPM data and patterns among a plurality of pCells, and uses the pCell as a location measurement result.

In the present invention, the pCell positioning server 420 receives the PPM data and the latitude-longitude data from the position calculation server 410 in order to build the pCell database, and if the PPM data includes a plurality of active PNs whose signal-to-noise ratio is greater than or equal to a predetermined reference value, The plurality of active PNs are set as a plurality of pieces of reference PN information of the pCell corresponding to the latitude and longitude data in the pCell database. Thereafter, of course, the pCell positioning server 420 builds a pCell database.

Here, the pCell positioning server 420 compares the signal-to-noise ratio and the predetermined reference value of the plurality of PNs included in the PPM data, respectively, and checks whether the plurality of active PNs are included in the PPM data.

In the present invention, the plurality of PNs includes a reference PN included in the PPM data and one or more adjacent PNs, and the predetermined reference value is preferably any one of an active PN setting criterion, that is, -12 dB to -13 dB. Here, since the reference PN of the PPM data is the PN of the base station currently serving, the signal-to-noise ratio is higher than the active PN setting reference. Therefore, the reference PN of the PPM data becomes the active PN unconditionally.

Meanwhile, if the PCell positioning server 420 includes one active PN (when only the reference PN of the PPM data is the active PN) in the PPM data, the pCell positioning server 420 may include a plurality of active PNs of the pCell corresponding to the latitude and longitude data in the pCell database. Set to one reference PN information.

When the pCell database is constructed in the above configuration in the pCell positioning server 420, the neighboring PN corresponding to the active PN, as well as the reference PN of the PPM data measured at the handoff border region between the base stations where the plurality of active PNs exist, is applied. Since it can be stored as a plurality of reference PN information of the pCell, even if any one of the plurality of active PNs included in the PPM data of the mobile communication terminal (not shown) located in the handoff border area becomes the reference PN, it is stored in the handoff border area. It can match the baseline PN information of the pCell database.

Accordingly, the pCell positioning server 420 can accurately perform pCell positioning of a mobile communication terminal (not shown) located in a handoff border region between base stations.

5 is a block diagram schematically showing the internal configuration of the pCell positioning server according to an embodiment of the present invention.

The pCell positioning server 420 according to the embodiment of the present invention includes a communication unit 510, a control unit 520, and a data storage unit 530.

The communication unit 510 is a network interface connecting the communication path between the external device and the pCell positioning server 420 and provides a data transmission / reception function with the location calculation server 410.

The controller 520 executes and controls a driving program stored in the data storage unit 710 according to a signal input through a key input unit (not shown), thereby controlling the overall functions of the pCell positioning server 420. .

In the present invention, the control unit 520 receives the PPM data and the latitude-longitude data from the position calculation server 410 through the communication unit 510 to build the pCell database, and the PPM data has a large number of active PNs whose signal-to-noise ratio is greater than or equal to a predetermined reference value. Is included, a plurality of active PNs is set as a plurality of reference PN information of a pCell corresponding to the latitude and longitude data in a pCell database. The signal-to-noise ratios of the plurality of PNs included in the PPM data and a predetermined reference value are respectively compared to determine whether the plurality of active PNs are included in the PPM data.

In the present invention, the predetermined reference value is preferably an active PN setting reference, that is, any one of -12 dB to -13 dB.

If the PPM data includes one active PN (when only the reference PN of the PPM data is the active PN), the controller 520 converts one active PN into one of the pCells corresponding to the latitude and longitude data in the pCell database. Set as reference PN information.

The data storage unit 530 stores a driving program of the pCell positioning server 420.

In the present invention, the data storage unit 530 stores the pCell database.

6 is a flowchart illustrating a process of building a pCell database in a pCell positioning server according to an embodiment of the present invention.

The pCell positioning server 420 receives the PPM data and the latitude and longitude data from the position calculation server 410 and checks whether a plurality of active PNs having a signal-to-noise ratio equal to or greater than a predetermined reference value are included in the PPM data (S610 and S620). Here, the pCell positioning server 420 compares the signal-to-noise ratio and the predetermined reference value of the plurality of PNs included in the PPM data, respectively, and checks whether the plurality of active PNs are included in the PPM data.

If the plurality of active PNs are included in the PPM data in step S620, the pCell positioning server 420 sets the plurality of active PNs as a plurality of pieces of reference PN information corresponding to the latitude and longitude data in the pCell database (S630). ). Here, the predetermined reference value is preferably an active PN setting reference, that is, any one of -12 dB to -13 dB.

On the other hand, if one active PN is included in the PPM data, that is, the PPM data not including the plurality of active PNs in step S620, one active PN is one reference of the pCell corresponding to the latitude and longitude data in the pCell database. Set to PN information (S640).

7 is a diagram illustrating a conventional pCell database for a handoff border region and a pCell database according to an embodiment of the present invention.

If the subscriber station is located in the handoff border area of the base station A (PN2), the base station B (PN4), and the base station C (PN7), the PN data collected by the subscriber station includes the base station PN as the reference PN. As in 7A, PN2, which is the PN of the A base station, is set as reference PN information of the conventional pCell database.

However, in the embodiment of the present invention, among the plurality of PNs included in the PPM data, as shown in FIG. Since it is set to PN information, even if the reference PN of PPM data measured by subscriber stations located in the handoff border region of A, B and C base stations becomes PN4 or PN7, the reference PN information of the pCell database for the handoff border region To match.

Accordingly, the pCell positioning server 420 may provide a more accurate pCell positioning result for the subscriber station located in the handoff border region. Here, it is preferable that the pCell positioning server 420 performs pCell positioning by considering reference PN information, except for reference PN information that matches the reference PN of PPM data, as neighboring PN information at the time of pCell positioning of the subscriber station.

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. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical spirit 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, where the pCell positioning server corresponds to the active PN as well as the reference PN of the PPM data in the pCell database for the handoff border area between the base stations where the plurality of active PNs exist. Since the adjacent PN is stored as the reference PN, it is a very useful invention to generate the effect of accurately positioning the pCell of the mobile communication terminal located in the handoff border region.

1 is a flowchart showing a network-based positioning method using a pCell database,

2 is a flowchart illustrating a conventional method for building a pCell database;

3 is a diagram illustrating an example of dividing a location service target area by a pCell;

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

5 is a block diagram schematically illustrating an internal configuration of a pCell positioning server according to an embodiment of the present invention;

6 is a flowchart illustrating a process of building a pCell database in a pCell positioning server according to an embodiment of the present invention;

 7 is a diagram illustrating a conventional pCell database for a handoff border region and a pCell database according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

410: location calculation server 420: pCell positioning server

510: communication unit 520: control unit

530: data storage unit

Claims (6)

In the server building the pCell database, Communication unit for providing data transmission and reception function with the position calculation server; And When receiving PPM (Pilot Phase Measurement) data and latitude-longitude data from the position calculation server through the communication unit, and the PPM data includes a plurality of active PN (Pseudo Noise) having a signal-to-noise ratio of a predetermined reference value or more, A controller configured to set an active PN as a plurality of pieces of reference PN information of a pCell corresponding to the latitude and longitude data in the pCell database Server for building a pCell database to improve the positioning accuracy, comprising a. The method of claim 1, Wherein the predetermined reference value is a signal-to-noise ratio value of any one of -12 dB to -13 dB. The method of claim 1, Wherein the plurality of active PNs includes a reference PN included in the PPM data and one or more adjacent PNs. A method for building a pCell database on a pCell location server, (a) receiving PPM data and latitude and longitude data from a location calculation server, and checking whether the PPM data includes a plurality of active PNs having a signal-to-noise ratio equal to or greater than a predetermined reference value; And (b) if the PPM data includes a plurality of active PNs, setting the plurality of active PNs as a plurality of pieces of reference PN information of a pCell corresponding to latitude and longitude data in the pCell database. Method for building a pCell database to improve the positioning accuracy, comprising a. The method of claim 4, wherein (c) setting one active PN as one reference PN information of the pCell if the active PN is included in the PPM data in step (a); Method for building a pCell database to improve the positioning accuracy, comprising a. The process of claim 4, wherein in step (a) The predetermined reference value is a value of any one of -12 dB to -13 dB.

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