KR20120102277A

KR20120102277A - Positioning method using the phase shift of base station

Info

Publication number: KR20120102277A
Application number: KR1020110020308A
Authority: KR
Inventors: 이원석
Original assignee: (주)휴빌론
Priority date: 2011-03-08
Filing date: 2011-03-08
Publication date: 2012-09-18

Abstract

PURPOSE: A network positioning determination method using the phase conversion of a base station according to received signal strength is provided to accurately measure a location using the phase conversion of a base station. CONSTITUTION: A terminal collects sector base station reception signals from adjacent base stations(S100). When received signals are two or more, the terminal searches the location of the collected reception sector from a data base(S130,S140). The terminal creates a virtual sector reception base station which moves to a service area direction as signal strength(S150). The terminal determines the location of the terminal using the received signal strength received in a location where the sector base station is rearranged(S160). [Reference numerals] (AA) Start; (BB) End; (S100) A terminal collects sector base station signals from an adjacent base station; (S110) A terminal receives a location calculation request through an input unit; (S120) A terminal determines the number of the received reception signal; (S130) Is the number of the received signals more than two?; (S140) The collected sector base station is searched in a database; (S150) Moving to a service area direction of a sector base station as signal strength; (S160) Positioning is determined using signal strength received from the final location of the rearranged sector base station

Description

Positioning method using the phase shift of base station based on the phase change of the position of the base station according to the received signal strength

The present invention relates to a network positioning determination method, and more particularly, when the terminal determines the position, when the terminal collects a received signal from a predetermined base station, the phase of the base station in sectors according to the strength and the receiving direction of the received signal By determining the network position by reflecting the base station phase change, the network position can be accurately determined by using the base station phase change of each sector even when the LOS (Line of Sight) is not secured. The present invention relates to a network location determination method using a phase change of a base station location.

The present invention relates to a network location determination method using a phase change of a base station location according to received signal strength.

Among various wireless Internet services using a mobile communication terminal, in particular, location based services (LBS) have gained much attention due to their wide availability and convenience.

The location-based service refers to a communication service that detects a location of a mobile communication terminal and provides additional information related to the identified location.

These location-based services can be used to address rescue requests, respond to crime reports, differentiate mobile communication rates according to Geographical Inftion System (GIS) location for providing neighboring information, traffic information, vehicle navigation and logistics control, and location-based CRM. It is used in various fields and situations, such as CustomerRelationship Management.

In the location positioning method for providing a location based service (LBS) to a mobile communication terminal, the location is determined in software using a radio environment, which is a cell radius of a base station of a mobile communication network, to measure the location of the mobile communication terminal. There are a network based method, a handset based method using a GPS (GlobalPositioning System) receiver installed in a mobile communication terminal, and a hybrid method in which these two methods are mixed.

The A-GPS method is a handset-based method, and an IS using European-based Global System for Mobile Communication (GSM) based network using a TDMA (Time Devision Multiple Access) wireless access method and a Code Devision Multiple Access (CDMA) wireless access method. It can be used in both -95 based network technology.

In the GSM wireless access method, the SUPL POS (RRLP (Radio) protocol, which is a protocol for positioning the OMA SUPL (Secure User Plane Location) interface and O-MAPS within the OMA SUPL, between a mobile communication terminal with a GPS receiver and an SPC (Supl Positioning Center) in the GSM network. The positioning of the mobile communication terminal is performed by sending and receiving a message through the GSM A-GPS protocol (Integrated Resource Location Protocol), and the positioning is very accurate because it receives and locates four or more satellite signals from the GPS satellites.

The AGPS system is an SPC (SUPL Positioning Center) that calculates a location by receiving satellite signals received from a mobile communication terminal and a location information center (SLC) that links calculations based on base station information in a GSM mobile communication network to other systems. It consists of).

E-OTD (Enhanced Observed Time Difference) is a representative network-based positioning method and standardized through LCS Release 98 and 99 at the GSM standard committee of TDMA-based GSM system in Europe using TDMA wireless access standard. Positions are determined by calculating the difference between the relative arrival times and distances of signals received at more than one base station. The E-OTD method is a method of combining a time difference concept, such as Observed Time Difference (OTD), Relative Time Difference (RTD), and Geometric Timedifference (GTD), to be used in the calculation of network location.

OTD means a difference in arrival time of a signal arriving from two base stations to a mobile communication terminal, and can be obtained by measuring a UE Rx-Tx Time Difference Type 2 parameter in a GSM-based mobile communication terminal.

RTD is a parameter that can be used to obtain the start time difference between signals transmitted from two base stations. Measurement is possible only when the base station is equipped with a separate measurement unit (LMU).

Therefore, in order to obtain "GTD = OTD-RTD" which is a key parameter for the network position calculation recommended in the GSM standard, the E-OTD type network position calculation can be performed only by obtaining the RTD as well as the OTD.

Network-based positioning technology uses data (e.g. PPM, OTD, RTD, etc.) measured by the mobile communication terminal and the LMU by a promised protocol between the mobile terminal and the server (e.g., IS-801, RRLP, RRC, etc.). It transmits to the positioning server, and performs the positioning function of the mobile communication terminal in the positioning server by using the measurement data (for example, PPM, OTD, RTD, etc.) of the mobile communication terminal.

The positioning server performs network location positioning (a method of positioning a location of a terminal requested for positioning at a server end except for a positioning method using GPS satellites), and the result is a target (eg, SLC or CP (ContentsProvider) requesting a positioning service. ), To a mobile communication terminal requesting service.

The network-based positioning technique uses a cell ID method using a base station radius cell, and an AOA (Angle Of Arrival) method that calculates a position by calculating a line of bearing (LOB) while receiving a signal from a mobile communication terminal. The TOA (Time Of Arrival) method for calculating a position in a mobile communication terminal based on the arrival time of radio waves transmitted from three or more base stations, and the arrival time difference of a pilot signal received from three base stations in the mobile communication terminal. There is a TDOA (Time Difference Of Arrival) method that determines the point where the two hyperbolas intersect by measuring the distance difference between the base stations and the position of the mobile communication terminal.

However, the location measuring method using the conventional network as described above has the following problems.

First, the time and distance measurement data, which are parameters measured in a mobile communication terminal or a mobile communication network, are affected by a repeater when triangulation or hyperbolic intersection is calculated. That is, when using a repeater, since the time and distance data between the base station and the mobile communication terminal measured by the mobile communication terminal is delayed compared to the original data, there is a problem that the positioning accuracy is lowered.

Second, in the case of asynchronous mobile communication networks (GSM, W-CDMA), the triangulation method using time and distance measurement parameters adds an LMU with an additional GPS device in addition to the Observed Time Difference (OTD), a parameter measured by the mobile communication terminal. It is necessary to measure up to RTD (Relative Time Difference) measured by LMU to calculate the positioning result by the formula.However, it is not significant for investment in installing additional LMU in the entire mobile network for network positioning. In the region where the LMU is not installed, there is a problem that the network positioning method using the triangulation method cannot be used.

Third, when relocating the base station, since the latitude and longitude data of the relocated base station cannot be immediately reflected, it is not possible to determine whether the latitude and longitude data referred to for positioning are the latitude and longitude data of the relocated base station. have.

Fourth, it is difficult to promote commercialization due to excessive input of human and physical resources in the parameter optimization process that is used differently for each base station or sector to improve the location measurement accuracy because the characteristics of mobile communication base stations and sectors are different for each network-based location measurement technology. There is a problem that occurs.

The present invention is invented to solve the above problems, the present invention is to determine the location of the terminal, when the terminal collects a received signal from a predetermined base station, the base station in sector units according to the strength and receiving direction of the received signal The received signal strength can be accurately determined by using the base station phase change in sectors even when the line of sight (LOS) is not secured by changing the phase of the network and reflecting the base station phase change. An object of the present invention is to provide a network location determination method using a phase change of a location of a base station.

In addition, the present invention provides a network positioning determination method using the phase change of the position of the base station according to the received signal strength that can be optimized in a small amount of time by setting the parameters for each sector by the environment in determining the position of the terminal It aims to do it.

In order to achieve the above object, the network positioning determination method using the phase change of the position of the base station according to the received signal strength according to the present invention is a method in which the terminal determines the position, the terminal receiving two or more from a predetermined base station When the signal is collected, the phase of the base station is changed in units of sectors according to the strength and receiving direction of the received signals, and the positioning is determined by reflecting the change of the base station phase.

In this case, the present invention comprises the steps of (A) the terminal collects the sector base station received signal from the base station; (B) the terminal determining the number of received signals collected by step (A); As a result of the determination of step (B), when the number of received signals collected by step (A) is two or more, each sector base station in which the terminal transmits the received signal is moved by a movement distance proportional to the signal strength in the received signal transmission direction. (C) moving to generate a virtual sector receiving base station; And (D) determining the position of the terminal based on the position of the virtual sector receiving base station generated by the step (C).

And step (C) is,

It is preferable to calculate a moving distance proportional to the signal strength using.

On the other hand, if the number of received signals collected by step (A) is one or less as a result of the determination of step (B), it is preferable that the terminal returns the location of the sector base station that transmitted the received signal.

And in the step (D), the terminal

(D1) calculating a propagation distance based on the signal strength of each of the received signals using; Terminal

Obtaining a weight of each received signal by using a step (D2); And the terminal

It includes; (D3) step of determining the position of the terminal using.

On the other hand, in the step (D1),

If you don't know the value,

It is desirable to find the propagation distance using.

According to the present invention, when the terminal determines the position, when the terminal collects a received signal from a predetermined base station, the phase of the base station is changed in sector units according to the strength and the receiving direction of the received signal, the base station By determining the network location by reflecting the phase change, there is an advantage in that the network location can be accurately determined by using the base station phase change in units of sectors even when a line of sight (LOS) is not secured.

In addition, the present invention has an advantage that the parameter can be optimized in a small time by setting the parameters for each sector in the environment in determining the position of the terminal.

In addition, the present invention has the advantage that accurate positioning is possible because the base station uses the phase change of the base station even if one base station is received.

In addition, the present invention has the advantage that it is possible to determine the exact positioning at any time, regardless of the repeater environment.

1 is a flowchart sequentially illustrating a network positioning determination method using a phase change of a base station location according to a received signal strength according to an exemplary embodiment of the present invention.
2 is an explanatory diagram illustrating that the terminal determines network positioning using only three base stations among received signals.
3 is an explanatory diagram for explaining that the terminal determines network positioning using only two base stations among received signals.
4 is an explanatory diagram illustrating that the terminal determines network positioning using only one base station among received signals.

Hereinafter, a preferred embodiment of a network positioning determination method using a phase change of a base station location according to the received signal strength according to the present invention as described above will be described in detail with reference to the accompanying drawings.

1 is a flowchart sequentially illustrating a method for determining network location using a phase change of a base station location according to a received signal strength according to an exemplary embodiment of the present invention.

The present invention relates to a method of changing the phase of a base station position according to the strength and reception direction of a signal transmitted from a base station, and determining a network position based on the changed information.

The terminal collects a sector base station received signal from a receiving base station located near the terminal (step S100).

In this case, the terminal may receive a location calculation request for querying the location of the current terminal through the input unit (step S110).

Then, the terminal determines the number of received signals collected (step S120), and if the number of received signals collected is one or less, the position of the base station is returned.

On the other hand, if the result of the determination is that the number of the received signal is two or more, the position of the received sector (Sector), which transmitted the received signal, respectively, is taken from the database (step S140), and the received signal is signaled in the on direction (antenna direction). Moving by the intensity, a virtual sector receiving base station is generated (step S150). That is, the terminal moves by the signal strength toward the service area of the sector base station to generate the virtual sector receiving base station.

At this time, when moving by the signal strength to calculate the moving distance by applying [Equation 1].

As described above, when the position of the sector receiving base station is moved, the terminal determines the position of the terminal with the signal strength received at the position of the moved sector receiving base station (step S160).

More specifically, the terminal calculates the propagation distance di by the signal strength of each received signal by using Equation (2). At this time,

Means the transmission strength of the base station,

Denotes a reception strength of the base station, and n denotes a pathloss. At this time, the pathloss is a value representing a characteristic of attenuation of the signal strength according to the distance as the radio wave proceeds through free space, and may exhibit different characteristics according to the frequency environment, and thus may be applied differently.

At this time,

If you do not know, use Equation 3.

Thereafter, the terminal weights each received signal by using Equation 4.

. At this time, the weight is the propagation distance

Is the inverse of.

Then, the terminal finally obtains the center point coordinates using Equation 5. That is, the center point coordinates are obtained after applying the weight of each received signal.

According to the present invention as described above, the present invention has the advantage that it is possible to determine the accurate positioning by using the phase change of the base station in the sector (Sector) even in a situation where the line of sight (LOS) is not secured.

Hereinafter, a process of operating the present invention will be described in detail with reference to embodiments to help the understanding of the description.

2 is an explanatory diagram illustrating that the terminal determines a location using only three base stations (A, B, and C of FIG. 2) among the received signals.

As shown in FIG. 2, the terminal collects sector base station received signals from receiving base stations (A, B, and C of FIG. 2) located around the terminal. In the present embodiment, it will be described that the terminal determines the network location with signals of three different base stations (A, B, C in FIG. 2).

Conventionally, the location of the terminal is determined using only the base station. In this conventional positioning method, the location result can be calculated only within the area of L1. However, if the terminal is located outside the L1 region, a large error occurs in the location result.

However, the present invention has been devised to solve this problem, and each of the receiving sectors a1, a2, b1, and c1 is moved by the distances of the signal strengths of as1, as2, bs1 and cs1 of the receiving sector Sector. A virtual sector receiving base station (a1, a2, b1, c1 in FIG. 2) is generated.

By using the virtual sector receiving base station generated as described above, the terminal finally determines the network location, that is, the location. In this case, the positioning result can be calculated in the area of L2 on the positioning method. This means that if the area of L1 is simply an area connecting the receiving base station, the area of L2 can calculate an accurate position result in a more detailed area than the area of L1 by using the direction of the receiving sector and the distance of the received signal.

FIG. 3 is an explanatory diagram illustrating that the terminal determines a location using only two base stations (A and B of FIG. 3) among the received signals.

As shown in FIG. 3, the terminal collects sector base station received signals from receiving base stations (A and B of FIG. 3) located around the terminal. In the present embodiment, it will be described that the terminal determines the network location with signals from two different base stations (A and B in FIG. 3).

The present invention has been made to solve such a problem, and each received sector a1, a2, b1 is moved by a distance of as1, as2, bs1, the signal strength of the received sector (Sector) to receive each virtual sector (Sector) Create a base station. When the location is determined using each of the generated virtual sector receiving base stations, the location result can be calculated within the area of L2 on the location determination method.

That is, if the area of L1 was a line area simply connecting the receiving base station, the area of L2 can calculate the accurate position result in a more detailed area than the area of L1 by using the direction of the receiving sector and the distance of the received signal. .

4 is an explanatory diagram illustrating a method of determining a network location using only one base station of a received signal.

As shown in FIG. 4, the terminal collects a sector base station received signal from a receiving base station (A of FIG. 4) located near the terminal.

Conventionally, the location of the terminal is determined using only the base station. In this conventional positioning method, the location result can be calculated only within the area of L1. However, if the terminal is located outside of the L1 area, that is, at a far distance from the base station, an error occurs in the location result.

The present invention has been made to solve such a problem, and each of the receiving sectors a1 and a2 is moved by a distance of as1 and as2, which are distance ratios of the received signals, so that each of the virtual sector receiving base stations (a1 in FIG. , a2).

When the location is determined using each of the generated virtual sector receiving base stations, the location result can be calculated within the area of L2 on the location determination method. This means that if the area of L1 is the receiving base station itself, the area of L2 can calculate an accurate position result in a more detailed area than the area of L1 by using the direction of the receiving sector and the distance of the received signal.

As described above, the present invention has the advantage that accurate positioning is possible because the base station uses the phase change of the base station even if one base station is received.

The present invention has been shown and described with respect to specific preferred embodiments thereof. However, the present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the technical spirit of the present invention by those skilled in the art. Accordingly, the scope of the present invention should be construed as being determined not by the specific embodiments but by the appended claims.

Claims

In the method for determining the location of the terminal,
When the terminal collects two or more received signals from a predetermined base station, the phase of the base station is changed in units of sectors according to the strength and receiving direction of the received signals, and the positioning is determined by reflecting the change of the base station phase. Network location determination method using phase change of base station location according to received signal strength.

The method of claim 1,
(A) the terminal collecting the sector base station received signal from the base station;
(B) the terminal determining the number of received signals collected by step (A);
As a result of the determination in step (B), when the number of received signals collected by step (A) is two or more, the terminal moves the base station in proportion to the signal strength in the receiving signal transmission direction based on the received signals for each sector. (C) generating a virtual sector receiving base station by moving the distance;
(D) determining the position of the terminal based on the position of the virtual sector receiving base station generated by the step (C); and using the phase change of the position of the base station according to the received signal strength. How to determine network location.

The method of claim 2, wherein step (C) comprises:

A method of determining network location using a phase change of a base station position according to a received signal strength, characterized in that a movement distance proportional to the signal strength is calculated using a.

The method of claim 2,
As a result of the determination in step (B), when the number of received signals collected by step (A) is one or less, the terminal returns the location of the sector base station that has transmitted the received signal. Network location determination method using the phase change of the location of the base station.

The method of claim 1, wherein (D) comprises:
Terminal

Obtaining a weight of each received signal by using a step (D2); And
Terminal

(D3) determining the location of the terminal using the network location determination method using the phase change of the position of the base station according to the received signal strength.

The method of claim 5,
In the step (D1),

If you don't know the value,

Network positioning determination method using the phase change of the position of the base station according to the received signal strength, characterized in that to obtain a propagation distance using.