KR101624328B1 - Method for predicting wave environment using measured data and apparatus thereof - Google Patents

Abstract

A propagation environment predicting method using actual data and an apparatus therefor are disclosed.

The propagation environment prediction region is divided into a grid of a predetermined size, and a representative value of measured data measured in the divided grid is calculated. A propagation path from the external base station or repeater to the propagation environment prediction area is obtained and a correction coefficient that is the difference between the representative value of the lattice where the propagation path first comes and the propagation prediction value of the lattice is calculated. The propagation environment prediction in the propagation environment prediction region is performed by applying the path loss correction value to the propagation path by the correction coefficient.

Propagation environment prediction, path loss, loss correction, truncation average, ray tube

Description

TECHNICAL FIELD [0001] The present invention relates to a method of predicting propagation environment using measured data,

The present invention relates to a propagation environment predicting method, and more particularly, to a method and apparatus for predicting a propagation environment inside or outside a building formed by a base station or a repeater outside the building using data measured in the vicinity of the building.

As the modern civilization has advanced and mobile communication has developed rapidly, the number of users who use mobile phone mobile communication service is increasing exponentially, and users want to receive desired service in real time anytime and anywhere regardless of reason .

Therefore, mobile service providers are planning to design and invest more efficiently in wireless networks to meet the needs of these customers. This is a consequence of accurate propagation prediction and efficient cell design based on this.

Particularly, as the mobile communication rapidly develops, most people spend most of their time in the organizations (companies) and households to which they belong, and the proportion of mobile communication traffic in the building or in the home is gradually increasing.

According to a recent statistic, about 70% of traffic from mobile communication occurs inside a building such as a building or apartment, and about 90% for data applications.

In this way, whether or not to provide mobile communication services in a building, which occupies a large portion in mobile communication, has a direct effect on the evaluation of the mobile communication service of a subscriber, which has a great influence on the sales of the mobile communication service provider.

Therefore, it is necessary to design a cell capable of optimally positioning an external base station or repeater so that the mobile communication service in the building can be smoothly provided by accurately analyzing and predicting the propagation environment formed inside the building.

However, it is already known that it is very difficult to predict the radio wave environment formed outside the building and inside the building by an external base station or repeater in a mobile communication environment. In particular, it is very difficult to predict and input information about various buildings and apartment complexes located in the radio propagation environment prediction area in a device for predicting the propagation environment in an area where buildings are concentrated such as a high-rise building or an apartment complex.

On the other hand, mobile communication providers measure the propagation environment in areas where buildings are concentrated, such as high-rise buildings or apartment complexes, as a way to optimize the propagation environment. At this time, the propagation environment data measured includes the intensity of the radio wave in the measurement area, the information of the base station, and the signal-to-noise ratio. The measurement method includes using a vehicle equipped with a measurement device or a measurement terminal .

Thus, the propagation environment data actually measured in a building or an apartment complex includes the influence of the building / terrain / altitude from the external base station or repeater to the measurement area. Therefore, A method of utilizing propagation environment data actually measured as described above is required for propagation environment prediction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a radio wave propagation environment capable of performing accurate propagation environment prediction by applying a difference between predicted data and actual data, which are predicted on a propagation path from an external base station or repeater, Prediction method and apparatus therefor.

According to an aspect of the present invention, there is provided a propagation environment predicting method,

Setting a propagation path from an external propagation source to a point within the propagation environment prediction target area; Dividing the propagation environment prediction target area into a grid of a predetermined size; Calculating a representative value of actual data of regions located in the divided grid; Calculating a correction coefficient that is a difference between a representative value of a lattice where the propagation path first meets the divided lattices and a propagation environment predicted value of an area located in the lattice first encountered; And performing the propagation environment prediction at the one point by applying the correction coefficient to the path loss value on the propagation path.

According to another aspect of the present invention,

A method for predicting propagation environment inside a building, comprising: loading a two-dimensional design drawing for a propagation environment prediction area; Converting each building located on the two-dimensional design drawing into a three-dimensional building; Setting a design factor for the three-dimensional building; Setting information on an external propagation source; Dimensional design drawing is divided into a shape of a reference plane for dividing the two-dimensional design drawing into a predetermined size and a shape of a reference plane for dividing the two- Performing a propagation environment prediction on the three-dimensional building surface by applying a correction coefficient corresponding to the difference between the propagation environment predicted value and the measured data of the propagation environment on the propagation path as the path loss value on the propagation path; And predicting a propagation environment inside the building using a propagation environment prediction result formed up to the building surface.

According to another aspect of the present invention,

A path loss correcting unit for dividing the propagation environment prediction region into a grid of a predetermined size and calculating a correction coefficient corresponding to the difference between the propagation environment prediction value and the actual data for the divided grid; And estimating a propagation environment formed at a point in the propagation environment prediction target area by an external propagation source, wherein a correction coefficient of a lattice where a propagation path formed up to the point by the external propagation source first meets the path loss And a propagation environment predicting unit for estimating a propagation environment at the one point by applying the propagation path value as a path loss value on the propagation path.

According to the present invention, more accurate propagation environment prediction can be performed by predicting the propagation environment by applying a correction coefficient corresponding to a difference between actual data and predicted data on a propagation path from an external base station or repeater to a building surface.

This makes it possible to design a more efficient cell and reduce the investment cost.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

In this specification, a base station (BS) is an access point (AP), a radio access station (RAS), a node B, a base transceiver station (BTS) Mobile Multihop Relay) -BS, and may include all or some of the functions of the access point, the radio access station, the Node B, the base transceiver station, and the MMR-BS.

Now, a propagation environment predicting method using measured data according to an embodiment of the present invention will be described in detail.

The embodiment of the present invention can be applied to a case of predicting a propagation environment in a high-rise building or an apartment inside or outside an apartment, where a high-rise building is concentrated or an apartment complex where apartments are concentrated . Therefore, in order to explain the embodiment of the present invention more easily, hereinafter, the building means an apartment, and an area where the building is located is set as an apartment complex. However, it will be understood by those skilled in the art that the following description of an apartment complex can also be applied to areas where high-rise buildings are concentrated.

Further, in the embodiment of the present invention, a method of forming a ray tube by a method of tracing a propagation path to a building surface in order to predict a propagation environment outside or inside the building is used.

First, in the propagation environment predicting method according to an embodiment of the present invention, path loss is corrected using actual measurement data for a path from an external base station or a repeater (hereinafter, referred to as an "external propagation source" do.

In the embodiment of the present invention, in order to correct such a path loss, the difference between the propagation environment prediction data predicted by the propagation environment prediction apparatus at a point located within the propagation environment prediction region and the actual measurement data actually measured at the corresponding point, As shown in FIG. Here, the propagation intensity prediction data includes Received Signal Strength Indication (RSSI), Received Signal Code Power (RSCP), and Transmit Power Intensity (TX_POWER), for example. That is, when the actual data at one point is? And the propagation intensity prediction data at the corresponding point is?, The correction coefficient? At that point is set to? - ?.

In the embodiment of the present invention, the correction coefficient for the path loss is not simply used as described above in the propagation environment prediction, but the correction coefficient indicating the path loss is utilized according to the characteristic of the ray tube method used in the method of tracking the propagation path .

For this, in the embodiment of the present invention, as shown in FIG. 1, the plan view of the propagation environment prediction area, that is, the two-dimensional plan view of the propagation environment prediction area is divided into a grid of a certain size. Here, the size of the lattice varies depending on the characteristics such as density of the propagation environment prediction region and the like.

Then, a representative value is determined for the actual data of the regions in the divided grid. For example, in the embodiment of the present invention, a truncation average value of actual data for regions within a divided grid is determined as a representative value of the corresponding grid. Here, the truncation means is the average of the measured data excluding the maximum value and the minimum value of the measured data.

Therefore, each lattice that divides the propagation environment prediction region can have one measured data representative value or no representative value when there is no measured data.

Also, the representative value of the grid should be distinguishable by PSC (Primary Scrambling Code) or RTD (Round Trip Delay).

In the embodiment of the present invention, as described above, the representative coefficient of the actual data set for each lattice is used as the actual data of the area in the lattice to calculate the correction coefficient. That is, the propagation prediction data in the region within the specific lattice and the actual data, which is a representative value of the corresponding lattice, are used as the actual data of the corresponding region, and the difference is calculated as the correction coefficient.

Therefore, the final propagation environment prediction value after the path loss correction is applied in the area is calculated by subtracting the free space loss from the transmission power from the external propagation source to the corresponding region and the correction coefficient of the corresponding region.

On the other hand, when the region to be predicted is located at the center rather than the outer periphery of the propagation environment prediction region in the propagation environment prediction, as shown in Fig. 2, the propagation path from the external propagation source to the propagation environment prediction target region has at least two It is most likely to pass through a grid. In this case, only the correction coefficient in the first lattice where the path is encountered is used for the path loss correction for the corresponding path. That is, even if the propagation path passes through several lattices from the external propagation source to the propagation environment prediction target area, only the correction coefficients extracted from the lattice are applied only when the propagation path reaches the first lattice, For grids, only Free Space Loss is applied.

2, when the propagation environment prediction region is located in the F region, the propagation path from the first base station 10 passes the lattice A and the lattice F, but according to the above description, A correction coefficient is extracted and applied.

On the other hand, when the gratings on the path do not have correction coefficients, only free space loss is naturally applied.

Also, if the first lattice on the path does not have a correction factor and the second lattice has a correction factor, then the second lattice correction factor is applied to predict the propagation environment in that region.

As described above, in the embodiment of the present invention, the difference between the predicted data and the measured data is applied as a correction coefficient to the propagation path from the external propagation source to the propagation environment prediction region, and correction Instead of applying the coefficient, only the correction factor for the lattice where the propagation path first arrives when the propagation environment prediction region is divided into lattices is applied.

An example of predicting the propagation environment inside the building by applying the above-described path loss correction contents will be described in detail.

3 is a block diagram of a radio wave environment predicting apparatus according to an embodiment of the present invention.

3, a propagation environment prediction apparatus according to an embodiment of the present invention includes an input unit 100, a storage unit 200, a three-dimensional building data processing unit 300, a building factor setting unit 400, A path setting unit 500, a path loss correcting unit 600, a propagation environment predicting unit 700, a display unit 800, and a control unit 900.

The input unit 100 includes input means such as a keyboard and a mouse for receiving commands or other information from a user (or an administrator).

The storage unit 200 stores a plan view of a building or an apartment complex (hereinafter referred to as a propagation environment prediction area), and stores various kinds of information necessary for predicting other propagation environments. In particular, the storage unit 200 according to the embodiment of the present invention stores actual measurement data, which is actually measured propagation intensity prediction data for each location in the propagation environment prediction area.

The three-dimensional building data processing unit 300 controls the two-dimensional buildings based on the plan view of the propagation environment prediction area stored in the storage unit 200 under the control of the controller 900, And stores the corresponding information in the storage unit 200.

The building parameter setting unit 400 sets the types and properties of the structures inside the building, which are the propagation environment prediction target, under the control of the controller 900. [ In this case, the type of the internal structure of the building is divided into the front surface, the side surface, the back surface, and the top surface of the building, and the type of medium on each surface must be set for analyzing the propagation environment inside the building. Here, the type of the medium may be glass, special glass, lightweight barrier, wood, masonry, iron gate, concrete, and the like. In addition, the properties of each structure may be the thickness, height, propagation loss value, dielectric constant, conductivity, reflection coefficient, etc. of the structure.

Under the control of the control unit 900, the external propagation source setting unit 500 sets the types and attributes of the external base station or the repeater and the base station or the repeater, which are located in the propagation environment prediction area and generate radio waves. Here, the location of the base station or the repeater can be set not only on the ground but also on the building roof. Parameters such as the rated output, the maximum power, the number of FAs, and the PSC of the external wave source are automatically selected by selecting the type of the external wave source. The attributes of the external propagation source may be the main direction of the antenna, the number of antennas, transmission parameters, and the like.

The path loss correcting unit 600 divides the plan view of the propagation environment prediction area stored in the storage unit 200 into a grid of a predetermined size and then uses the actual data for each location stored in the storage unit 200, The representative value of the measured data is determined. Here, as described above, the representative value is determined by the truncation average value of the actual data for each position belonging to the lattice. The path loss corrector 600 calculates a correction coefficient corresponding to the difference between the propagation environment prediction data at a specific position in the lattice and the actual data representative value of the lattice.

Under the control of the control unit 900, the propagation environment predicting unit 700 divides the building surface into meshes, tracks the propagation path to the mesh of the propagation environment analysis target through a ray tube method, After correcting the path loss on the tracked propagation path through the path loss corrector 600, the propagation environment to the interior of the building corresponding to the mesh is predicted. At this time, the propagation environment predicting unit 700 transmits the predictive data for the propagation path of the grid passing first among the grids divided by the path loss corrector 600 to the path loss corrector 600, Receives the correction coefficient calculated by the path loss corrector 600, and applies a correction coefficient when estimating the propagation environment on the propagation path.

Under the control of the controller 900, the display unit 800 displays various kinds of information generated in the propagation environment predicting process. In particular, the display unit 800 displays the result of predicting the propagation environment inside the building by the propagation environment predicting unit 700 so that the user can view the result. For example, the display unit 800 can display the internal propagation environment prediction results for the buildings by comparing them with the propagation environment predicting unit 700.

FIG. 4 is a detailed block diagram of the path loss correcting unit 600 shown in FIG.

4, the path loss correction unit 600 includes a lattice division unit 610, a representative value calculation unit 620, a target lattice determination unit 630, and a correction coefficient calculation unit 640.

The lattice division unit 610 loads the plan view of the propagation environment prediction area stored in the storage unit 200, divides the plan view into a grid of a predetermined size, and then stores the division information in the storage unit 200. [

The representative value calculation unit 620 receives the actual data of each region located in each grid from the storage unit 200 for each of the grids divided by the grid partitioning unit 610 and stores the average value of the actual data as the actual data representative value of the corresponding grid .

The target lattice determiner 630 receives the propagation path determined by the propagation environment predicting unit 800, and among the grids passing through the propagation path, the propagation path among the grids whose representative values are calculated by the representative value calculating unit 620 is the first Determine the grid to meet.

The correction coefficient calculator 640 receives the propagation environment prediction value of the area in the lattice determined by the object lattice determiner 630 to the propagation environment prediction unit 700 and calculates a correction coefficient corresponding to the difference from the representative value of the lattice To the propagation environment predicting unit 700 as the path loss correction value of the propagation path.

FIG. 5 is a detailed block diagram of the propagation environment predicting unit 700 shown in FIG.

5, the propagation environment predicting unit 700 includes a mesh division unit 710, a ray tube path tracing unit 720, an external propagation intensity calculation unit 730, and an internal propagation environment predicting unit 740 .

The mesh division unit 710 divides the building and the floor into meshes based on the building data converted into the three-dimensional form by the three-dimensional building data processing unit 300. Here, the front, back and bottom surfaces of the building are basically divided into a rectangular mesh, and the upper surface is divided into two types of triangular meshes. In the case of the side surface, if the medium is the same as the front surface, it is divided into a square mesh. If the medium is concrete, it is divided into a large square. The shape and size of such a mesh can be arbitrarily selected in triangle, square, or other form, taking speed and accuracy into consideration. At the same time as the division of the mesh, information necessary for the basic operation is stored in the storage unit 200 for each mesh. For example, the mesh midpoint, mesh normal vector, and so on.

The ray tube path tracing unit 720 sets a ray tube from an external propagation source for all meshes partitioned by the mesh division unit 710 and sets the set ray tube as a forward tree structure And a storage unit 200. The storage unit 200 determines a valid path through a mesh corresponding to a mesh designated by the user through the input unit 100, that is, an apartment call for analyzing an internal propagation environment, . Here, the method of determining the effective path by the setting of the ray tube is well known, and a detailed description thereof will be omitted here.

The external propagation intensity calculation unit 730 calculates the external propagation intensity of the radio wave that has been incident, reflected, transmitted, or diffracted up to the mesh surface designated by the user through the effective path determined by the ray tube path tracing unit 620 through the antenna of the external propagation source Calculate the strength. Here, the external propagation intensity calculation unit 730 transmits the effective path determined by the ray tube path tracing unit 620 to the path loss correction unit 600, and the correction coefficient calculated by the path loss correction unit 600 And calculates the intensity of the final propagation to the mesh surface by applying a correction factor when calculating the intensity of the radio wave through the effective path. Meanwhile, the intensity of the radio wave output from the antenna of the external propagation source is estimated by calculating the three-dimensional radiation pattern of the antenna, and interpolation is used for predicting the three-dimensional radiation pattern of the antenna. Since the interpolation method is well known, detailed description is omitted.

The internal propagation environment predicting unit 740 estimates the intensity of the radio wave at a specific internal position based on the sum of the intensities of all the radio waves that pass through the interior of the mesh designated by the user and are incident on the mesh, Of the propagation environment. There are various methods for predicting the propagation environment inside, and since the embodiment of the present invention is not characterized by the method for predicting the propagation environment inside the building, the method of predicting the propagation environment inside the building A detailed description thereof will be omitted. Nevertheless, as an example, assuming that the building is an apartment, one of the apartments has a veranda side for the front side and a kitchen side for the back side, so the mesh side is the veranda side and the kitchen side. Therefore, the intensity of all radio waves passing through a specific location is obtained by entering the veranda side and the kitchen side. Here, the specific location inside the apartment can be set differently according to the internal structure of the apartment, but since most people spend a lot of time in the living room based on living in the apartment, . For example, you can set the location to be 4 m from the veranda, 8 m from the kitchen, and 1.5 m from the bottom.

Hereinafter, a propagation environment predicting method according to an embodiment of the present invention will be described in detail with reference to FIG.

The three-dimensional building data processing unit 300 loads the two-dimensional design drawing of the propagation environment prediction area stored in the storage unit 200 under the control of the controller 900, (S100). When converting a two-dimensional building into a three-dimensional building, it is well known that a scale is set on a two-dimensional design drawing and converted to an actual size.

Next, the building parameter setting unit 400 sets the material to be given to the building converted into the three-dimensional form, in particular, the material of the surface of the building (S110). Here, the material to be given to the surface of the building may be divided into glass front surface, glass side surface, glass back surface, concrete side surface, and concrete back surface material. Accordingly, the building factor setting unit 400 controls the user to select the material for the building surface as described above.

Next, the external propagation source setting unit 500 receives the location, direction, and setting information of an external propagation source, which is an external base station or a repeater within the propagation environment prediction area, from the user, and sets the external propagation source as an external propagation source. Here, the location of the external propagation source can be input on a design drawing changed into a three-dimensional shape, and the location of the external propagation source may be located on a ground, a building, or the like because the building is a three- If the external radio source is a base station, the type, height, angle, and direction angle of the base station antenna can be set. The cable type and the length from the radio wave output terminal to the antenna can also be input and set. In the case of the repeater, the rated output, the total power, the FA number, the PSC, the height, and the like can be automatically set by setting the type of the repeater. In the embodiment of the present invention, since the propagation environment prediction of the three-dimensional form is performed, the direction of the antenna can also be set in a three-dimensional form. That is, it can be set by using a three-dimensional building in the direction of the antenna.

As described above, since the two-dimensional design drawing is converted into the three-dimensional design drawing and the external propagation source is also set, the propagation environment predicting unit 700 under the control of the controller 900 is influenced by the influence of the propagation by the external propagation source Prediction of the propagation environment formed inside the building is performed (S130).

This propagation environment prediction will be described in more detail with reference to FIG.

First, the lattice division unit 610 of the path loss correction unit 600 loads the plan view of the propagation environment prediction area stored in the storage unit 200, divides the plan view into a grid of a predetermined size, 200) (S131).

The representative value calculation unit 620 receives the actual data of each region located in each grid from the storage unit 200 for each of the grids divided in the grid partitioning unit 610 and calculates the truncation average value of the actual data as the actual data representative value of the corresponding grid (S132).

Next, the mesh division unit 710 of the propagation environment predicting unit 700 divides the building and the floor into meshes based on the building data converted into the three-dimensional form (S133).

Thereafter, the ray tube path tracing unit 720 sets a ray tube from an external propagation source for all of the divided meshes, stores the set ray tube in the storage unit 200 as a forward tree structure (S134), determines a valid path passing through each mesh, and stores it in the storage unit 200 (S135).

Next, the external propagation path strength calculation unit 730 transmits the effective path determined in the step S155 via the antenna of the external propagation source to the path loss correction unit 600, In step S136, the unit 630 receives a valid path and determines a grid in which the propagation path is first encountered among the grids in which the representative value is calculated by the representative value calculation unit 620 among the grids passing through the valid path.

The correction coefficient calculating unit 640 receives the propagation environment prediction value of the region in the lattice determined by the target lattice determining unit 630 to the propagation environment predicting unit 700 and outputs a correction coefficient corresponding to the difference from the representative value of the lattice And provides it to the propagation environment predicting unit 700 as a path loss correction value of the propagation path (S137).

Accordingly, the external propagation intensity calculation unit 730 receives the correction coefficient provided from the path loss correction unit 600 and calculates the intensity of the final propagation to the mesh surface by applying the correction coefficient when calculating the intensity of the radio wave through the valid path (S138).

In this way, the internal propagation environment predicting unit 740 predicts the propagation environment inside the building by calculating the intensity of the radio wave at a specific position located inside each mesh, using the intensity of the radio wave calculated up to the mesh face (S139 ).

When the prediction of the propagation environment formed inside the building is completed due to the influence of the propagation by the external propagation source, the controller 900 determines that the propagation environment prediction for the inside of the building is completed in the step S130 And displays it on the screen through the display unit 800 (S140).

Thereafter, the control unit 900 stores the result information analyzed by the propagation environment predicting unit 700 in the storage unit 200 (S150).

As described above, in the embodiment of the present invention, when predicting the propagation intensity from the external propagation source to the building surface, a correction coefficient corresponding to the difference between the measured data and the predicted data is applied on the propagation path from the external propagation source to the building surface A more accurate propagation environment prediction can be performed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

FIG. 1 is a diagram illustrating an example of dividing a propagation environment prediction region into a grid of a predetermined size in the propagation environment predicting method according to an embodiment of the present invention.

2 is a diagram showing a case where a propagation path from an external propagation source to a propagation environment prediction target region passes through at least two or more lattices in the propagation environment predicting method according to the embodiment of the present invention.

3 is a block diagram of a radio wave environment predicting apparatus according to an embodiment of the present invention.

4 is a detailed block diagram of the path loss corrector shown in FIG.

5 is a detailed block diagram of the propagation environment predicting unit shown in FIG.

6 is a flowchart of a propagation environment predicting method according to an embodiment of the present invention.

7 is a detailed flowchart of the propagation environment prediction process shown in FIG.

Claims (11)

A method for predicting propagation environment in a propagation environment prediction target area, Setting a propagation path from an external propagation source to a point within the propagation environment prediction target area; Dividing the propagation environment prediction target area into a grid of a predetermined size; Calculating a representative value of actual data of regions located in the divided grid; Calculating a correction coefficient that is a difference between a representative value of a lattice where the propagation path first meets the divided lattices and a propagation environment predicted value of an area located in the lattice first encountered; And Applying the correction coefficient as a path loss value on the propagation path to perform propagation environment prediction at the one point And estimating the propagation environment. The method according to claim 1, And a propagation environment prediction is performed at the one point by calculating a correction coefficient for a grid having a representative value at which the propagation path first meets when there is no actual data for the regions located within the grid that is first encountered. Environmental prediction method. 3. The method according to claim 1 or 2, Wherein propagation environment prediction at the one point is performed by applying only the free space loss to the propagation path when all the gratings passing through the propagation path are not grids having a representative value. 3. The method according to claim 1 or 2, Wherein the propagation intensity prediction value at the first meeting lattice is determined as a value obtained by subtracting the correction coefficient from the free space loss at the transmission power of the external propagation source. 3. The method according to claim 1 or 2, Wherein the representative value is a truncation average value of the actual data. A method for predicting propagation environment inside a building, Loading a two-dimensional design drawing for a propagation environment prediction area; Converting each building located on the two-dimensional design drawing into a three-dimensional building; Setting a design factor for the three-dimensional building; Setting information on an external propagation source; Dimensional design drawing is divided into a shape of a reference plane for dividing the two-dimensional design drawing into a predetermined size and a shape of a reference plane for dividing the two- Performing a propagation environment prediction on the three-dimensional building surface by applying a correction coefficient corresponding to the difference between the propagation environment predicted value and the measured data of the propagation environment on the propagation path as the path loss value on the propagation path; And Estimating a propagation environment in the building using a propagation environment prediction result formed up to the building surface And estimating the propagation environment. The method according to claim 6, Wherein the step of performing the propagation environment prediction comprises: Setting a propagation path from the external propagation source to the three-dimensional building surface; Dividing the two-dimensional design drawing into a grid of a predetermined size; Calculating a representative value of actual data of regions located in the divided grid; Calculating a correction coefficient that is a difference between a representative value of a lattice where the propagation path first meets the divided lattices and a propagation environment predicted value of an area located in the lattice first encountered; And Performing propagation environment prediction on the three-dimensional building surface by applying the correction coefficient as a path loss value on the propagation path And estimating the propagation environment. An apparatus for predicting a propagation environment in a propagation environment prediction area, A path loss corrector for dividing the propagation environment prediction region into a grid of a predetermined size and calculating a correction coefficient corresponding to a difference between the propagation environment prediction value and the actual data for the divided grid; And A propagation environment formed at a point in a propagation environment prediction target area by an external propagation source is predicted, and a correction coefficient of a lattice where a propagation path formed up to the above point by the external propagation source first arrives, A propagation environment predicting unit for estimating a propagation environment at the one point by applying the calculated pathloss value to the path loss value on the propagation path, And estimates the propagation environment of the radio wave. 9. The method of claim 8, The path loss correcting unit, A lattice division part for dividing the propagation environment prediction area into lattices of a predetermined size; A representative value calculation unit for calculating a representative value of actual data for each region located in each grid by the grid divided by the grid division unit; A target lattice determining unit that determines a lattice where the propagation path is first encountered among grids whose representative values are calculated by the representative value calculating unit among lattices passing through the propagation path; And Calculating a correction coefficient corresponding to a difference between a propagation intensity prediction value of an area in the lattice determined by the target lattice determiner and a representative value of the lattice, and transmitting the correction coefficient to the propagation environment predicting unit, And estimates the propagation environment of the radio wave. 9. The method of claim 8, The propagation environment predicting unit, A mesh dividing unit dividing a building surface in the propagation environment prediction area into meshes; A path tracing unit for setting a propagation path from the external propagation source for one mesh divided by the mesh division unit; And Calculating an external propagation intensity for calculating the external propagation intensity for the one mesh by applying the correction coefficient transmitted from the path loss corrector as a path loss value on the propagation path, part And estimates the propagation environment of the radio wave. 11. The method of claim 10, Wherein the intensity of a radio wave at a specific location inside the building is calculated based on a sum of intensities of all the radio waves that can pass through the inside of the one mesh and are incident on the mesh, The propagation environment predicting unit Further comprising:

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