KR20110063959A - Method of sampling the rays, method and apparatus of producing the radio wave model using the same - Google Patents

Abstract

PURPOSE: A light ray sampling method and a propagation model generating method and apparatus using the same are provided to perform the sampling of a light ray transmitted from a delivery point in consideration of the arrangement of a structure. CONSTITUTION: A delivery point setting unit(720) sets a delivery point for transmission of electric waves in a structure database(710). A structure selection unit(730) selects a structure within a critical distance from the set delivery point. A light ray selection unit(740) transmits a plurality of light rays in the delivery point set to the selected structure. The light ray selection unit selects a light ray reaching the selected structure of the transmitted light rays. A propagation characteristic prediction unit(750) predicts propagation characteristics.

Description

Ray sampling method, method and apparatus for generating radio wave model using same {Method of Sampling the rays, Method and Apparatus of Producing the Radio wave Model using the same}

The present invention relates to a ray sampling method, a propagation model generation method and apparatus using the same, and more particularly, to a ray sampling method for determining propagation characteristics in consideration of the arrangement of the structure, and a propagation model generation method and apparatus using the same.

The present invention is derived from a study conducted as part of the IT source technology development project of the Ministry of Knowledge Economy [Task Management Number: 2008-F-013-02, Title: Spectrum engineering and millimeter wave radio wave resource technology development].

Recently, due to the increasing demand for personal communication services, interest in the radio environment in urban areas is increasing. Inner cities usually consist of small cells with a service radius of less than 1 km. Small cells include micro cells and pico cells, which, unlike macro cells with a relatively large service radius, receive power greatly depending on the radio environment between the base station and the mobile station. . Therefore, precise analysis is required for accurate prediction of the received power, and the necessity of a propagation model formed based on the propagation path is more urgent.

Conventional methods for obtaining a propagation model include a statistical method of obtaining statistics based on experimental results and a computer prediction method of obtaining a propagation model by predicting a propagation path through a computer based on a theory.

The method of obtaining a propagation model by a statistical method has an advantage of easily obtaining prediction values, but there is a limit in obtaining an accurate propagation model since the distribution of the actual terrain and buildings is not considered. On the other hand, the computer prediction method has the advantage of obtaining a very accurate propagation model because the actual building data is used to calculate all possible propagation paths and obtain the result. However, there are limitations in predicting all possible propagation paths, and it takes a long time to predict as many propagation paths as possible.

One of the computer prediction methods is to generate a semi-infinite straight line in all directions from the position of the transmitting antenna to identify the point where the straight line meets the building surface.

Although not exactly the same as the actual propagation phenomenon, the reason for using a straight line is that if the area of the building surface is very large compared to the wavelength of the radio wave, the area affected by diffraction is relatively narrow and can be ignored.

When the radio waves emitted from the building surface and the transmitting antenna meet, a straight line corresponding to the reflected wave can be made according to the angle of the building surface and the straight line, and the generated straight line meets the building surface again. Check for passing through the point. If the measurement point is included in the path of the radio wave, the attenuation of the radio wave due to the distance from the transmission point to the measurement point and the attenuation due to the reflection of the wall are calculated.

In this way, the accuracy of calculating the actual propagation model depends on the number of infinite straight lines. The more infinite straight lines are used, the more accurate the propagation model is, but the more time it takes to calculate the propagation model.

An object of the present invention is to provide a ray sampling method that can reduce the time in consideration of the arrangement of the structure.

Another object of the present invention is to provide a propagation model generation method using a ray sampling method that can reduce the time in consideration of the arrangement of the structure.

Still another object of the present invention is to provide an apparatus for generating a propagation model using a ray sampling method capable of shortening time in consideration of the arrangement of a structure.

In the light ray sampling method for achieving the object of the present invention described above, in the light ray sampling method using a structure database having a transmission point for transmitting a light ray, it is possible to reach a single straight line from the transmission point in the structure database, Selecting a structure that is within a critical distance from the delivery point; And transmitting a plurality of light rays predetermined at the emission point with respect to the selected structure, and selecting a light ray reaching the selected structure from the transmitted light rays.

Here, the threshold distance may be a distance at which the intensity of the transmitted light is maintained above a predetermined intensity value.

Here, the angle between neighboring light rays in the predetermined plurality of light rays may be changed.

According to another aspect of the present invention, there is provided a propagation model generation method using a ray sampling method, the method comprising: setting a transmission point for transmitting radio waves from the structure database; Sampling a light ray based on the set emission point; And predicting propagation characteristics by using the sampled light rays.

The sampling of the light ray based on the set sending point may include selecting a structure that is reachable in a single straight line from the set sending point in the structure database and is within a critical distance from the set sending point; And transmitting a plurality of predetermined light rays at the set transmission point with respect to the selected structure, and selecting a light ray reaching the selected structure from the transmitted light rays.

Here, the threshold distance may be a distance at which the intensity of the transmitted light is maintained above a predetermined intensity value.

Here, the angle between neighboring light rays in the predetermined plurality of light rays may be changed.

An apparatus for generating a radio wave model using a ray sampling method for achieving another object of the present invention described above includes a structure database for a region to which a radio wave model is to be generated; A transmission point setting unit for setting a transmission point for transmitting radio waves from the structure database; A structure selecting unit configured to select a structure within the critical distance from the set sending point in the structure database and reachable in a single straight line; A light beam selection unit which transmits a plurality of light rays predetermined at the set transmission point with respect to the selected structure, and selects a light ray reaching the selected structure from the transmitted light rays; And a propagation characteristic predictor for predicting propagation characteristics using the selected structure and the selected light beam.

Here, the threshold distance may be a distance at which the intensity of the transmitted light is maintained above a predetermined intensity value.

Here, the angle between neighboring light rays in the predetermined plurality of light rays may be changed.

According to the light ray sampling method, the propagation model generation method using the same, and the propagation model generation device using the same, the propagation model which can shorten the time can be shortened because the light ray emitted from the transmission point can be sampled in consideration of the arrangement of the structure. Analysis can be performed.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description.

However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. In the following description of the present invention, the same reference numerals are used for the same elements in the drawings and redundant descriptions of the same elements will be omitted.

1 is a flowchart illustrating a ray sampling method according to an embodiment of the present invention.

Referring to FIG. 1, the ray sampling method according to an embodiment of the present invention is a ray sampling method using a structure database having a transmission point for transmitting light rays, the structure database reaching a single straight line from the emission point in the structure database. And selecting a structure within a critical distance from the transmitting point (step 110) and transmitting a plurality of light rays predetermined at the sending point with respect to the selected structure, And selecting the arriving beam (step 120).

First, the structure database refers to a collection of data representing the terrain and features existing in the area. By using the structure database, it is possible to recognize the features of the area in the same way as in the real world. In addition, the transmission point refers to a point for transmitting a radio wave at a specific position in the structure database. As a result, a ray sampling method according to an embodiment of the present invention may be performed based on a transmission point for transmitting a radio wave in the structure database and the structure database.

Next, in the structure database, the step of selecting a structure that is reachable in a single straight line from the sending point and is within a critical distance from the sending point (step 110) is that the light beam to be transmitted based on the sending point is in a linear direction. It refers to selecting a structure existing at a position that can be reached by an angle. That is, it means to exclude from the structure database a structure existing at a position where the light to be transmitted cannot reach in a linear direction due to an obstacle that absorbs or reflects the light to be transmitted. As a result, only the structure in the position that can reach the ray to be transmitted from the structure database is selected to perform the subsequent operation.

2 is an exemplary view for explaining a structure that can be reached in a single straight line from the emitting point in the ray sampling method according to an embodiment of the present invention.

Referring to FIGS. 1 and 2 in parallel, in the ray sampling method according to an embodiment of the present invention, the light beams to be transmitted on the basis of the sending point of the structure A, the structure B, the structure C, the structure D, and the structure E are straight lines. Judging whether the direction can be reached in the direction, it can be seen that the light beam to be transmitted by the structure A, the structure B, the structure D and the structure E can reach, but the structure C is absorbed by the light beam to be transmitted by the structure B It can be seen that it cannot be reached by reflection or reflection. That is, in the step of selecting a structure that is reachable in a single straight line from the sending point in the structure database and is within a critical distance from the sending point (step 110), the structure A, the structure B, the structure D, and the structure E are selected once. Will be done.

In addition, selecting a structure that is reachable in a single straight line from the sending point in the structure database and is within a critical distance from the sending point (step 110) may be performed within a threshold distance of the sending point in the structure database. It refers to selecting the structure to which it belongs. Here, the threshold distance refers to the distance that the intensity of the transmitted light is maintained above a predetermined intensity value, for example, since the radio wave transmitted from the base station is characterized in that the intensity decreases in inverse proportion to the square of the distance In other words, it refers to a distance determined by a predetermined strength value of the minimum radio wave strength that the terminal can receive and recognize as valid data. As a result, in the case of a structure located where the intensity of the transmitted light beam does not satisfy a predetermined intensity value or more, the terminal receiving the signal reflected by the structure may determine that valid data cannot be received. The structure is to be excluded in advance from the ray sampling method.

3 is an exemplary view for explaining a structure within a critical distance from a transmitting point in the ray sampling method according to an embodiment of the present invention.

Referring to FIGS. 1 and 3 in parallel, in the light ray sampling method according to an embodiment of the present invention, when the critical distance is represented by a dotted line, the structure A among the structures A, B, D, and E may be represented. And it can be seen that the structure B is within the critical distance, the structure D and E can be seen to exist outside the critical distance. As a result, in the step of selecting a structure that can be reached in a single straight line from the sending point in the structure database and is within a critical distance from the sending point (step 110), only the structure A and the structure B will be selected.

In addition, selecting a structure that can be reached by a single straight line from the sending point in the structure database and selecting a structure that is within a critical distance from the sending point in the structure database may be performed in an order from each other. It may be done in parallel without. That is, the order of both will not affect the result of the selected structure.

Next, transmitting a plurality of light rays predetermined at the transmission point with respect to the selected structure, and selecting a light ray reaching the selected structure from the transmitted light rays (step 120) It may be to transmit a plurality of predetermined light rays at the sending point. Here, the angle between neighboring light rays in the predetermined plurality of light rays may be changed. That is, the plurality of predetermined light rays may be ones having a narrow angle between neighboring light rays or a wide angle between neighboring light rays according to the level of the ray sampling method, and between the neighboring light rays in the plurality of predetermined light rays. The angle may be changed according to the change of the ray sampling method. As a result, it may be to transmit the light beam through the entire 360 로 at a predetermined angle at the transmission point or to transmit the light beam at a predetermined angle only for a specific area.

4 is an exemplary diagram for describing the transmission of a plurality of light rays at the emission point in the ray sampling method according to an embodiment of the present invention.

Referring to FIG. 1 and FIG. 4 in parallel, in the ray sampling method according to an embodiment of the present invention, transmitting a plurality of predetermined rays at the emission point may transmit rays A through K. FIG. The angle between neighboring light rays in the light rays A to K may be determined according to the light ray sampling method. Eventually, the light beams A to K, which are a predetermined plurality of light beams, may be transmitted to the selected structure, and the light beams A to K may be displayed as virtual straight lines, which are represented by the virtual straight lines. Each ray may be a ray passing through the selected structure.

In addition, the transmitting of a plurality of predetermined light rays at the transmission point with respect to the selected structure, and selecting the light rays reaching the selected structure from the transmitted light beams (step 120) is the selection from the transmitted light rays It may be to select only the light beam that reaches the structure. That is, the light rays that cannot reach the selected structure are used as the light ray sampling method using only the light rays reaching the structure except the light ray sampling method.

FIG. 5 is an exemplary diagram for describing reaching a structure selected from light rays emitted by a light ray sampling method according to an exemplary embodiment of the present invention.

Referring to FIGS. 1, 4, and 5 in parallel, in the ray sampling method according to an embodiment of the present invention, selecting a ray reaching the selected structure from among the ray rays transmitted may include rays A through K. In the case of a virtual straight line with respect to the light beam, the light beam A, light beam B, light beam E, and light beam F do not reach the selected structure. May be selecting rays C, rays D, rays G, rays H, rays I, rays J, and rays K, which may be selected.

6 is a flowchart illustrating a propagation model generation method according to an embodiment of the present invention.

Referring to FIG. 6, in the propagation model generation method according to an embodiment of the present invention, in the propagation model generation method using a structure database, setting a transmission point for transmitting a radio wave from the structure database (step 610). ), Sampling the light ray based on the set transmission point (step 620) and predicting propagation characteristics using the sampled light ray (step 630).

First, setting a transmission point for transmitting a radio wave in the structure database (step 610) may be to determine the transmission point of the base station because the transmission point of the base station must be determined first to generate a propagation model. Here, the transmission point of the base station may be determined at a location on a two-dimensional plane, or may be determined at a location on a three-dimensional plane in consideration of height. That is, the transmission point of the base station may be determined for the two-dimensional propagation model without considering the antenna height and the height of the structure of the base station, and for the three-dimensional propagation model considering the antenna height and the height of the structure of the base station It may be to determine the discharge point in consideration of the height. However, a two-dimensional propagation model generation method may be usefully used for a simple propagation model generation method.

Next, the step of sampling the light beam based on the set transmission point (step 620) is a structure that can reach a single straight line from the set transmission point in the structure database, and selects a structure within a critical distance from the set transmission point And transmitting a plurality of predetermined light beams at the set transmission point to the selected structure (step 621), and selecting a light beam reaching the selected structure from the transmitted light beams (step 622). Can be configured. Here, the threshold distance may be a distance at which the intensity of the transmitted light ray is maintained above a predetermined intensity value, and the angle between neighboring light rays in the plurality of predetermined light rays may be changed.

As described above, in the structure database, selecting a structure that is reachable by a single straight line from the set sending point and is within a critical distance from the set sending point (step 621) may cause the light beam to be transmitted to reach a single straight line. It may be to select a structure existing in a position that can be, and to select a structure existing within a critical distance that the terminal receiving the light to be transmitted can be processed as valid data. In addition, the step of transmitting a predetermined plurality of light rays to the selected structure at the set transmission point, and selecting a light ray reaching the selected structure from the transmitted light beams (step 622). It may be to select the light beam that reaches the selected structure when it is transmitted, and displayed in a virtual straight line from the transmitted light beam.

Next, the step of predicting the propagation characteristics using the sampled rays (step 630) is to use the selected structure and the selected rays in the step of sampling the light rays based on the set transmission point (step 620). It may be to predict. For example, in order to predict the propagation characteristics, it is necessary to designate a reception point based on a transmission point and to comprehensively consider whether the radio wave at the reception point is reached by reflection of the radio wave and attenuation of the radio wave strength. As described above, it may be repeatedly and comprehensively predicting whether the radio wave at each reception point is reached by reflection or the like and attenuation of the radio wave intensity. The iterative and comprehensively predicted data may be used to generate a propagation model.

7 is a block diagram illustrating an apparatus for generating a propagation model according to an embodiment of the present invention.

Referring to FIG. 7, the propagation model generating apparatus 700 according to an embodiment of the present invention transmits a radio wave from the structure database 710 and the structure database for a region in which a radio wave model is to be generated. Transmission point setting unit 720 for setting a point, a structure selection unit 730 for reaching a single straight line from the set transmission point in the structure database, and selecting a structure within a critical distance from the set transmission point, A light beam selection unit 740 for transmitting a plurality of light rays predetermined at the set transmission point to the selected structure, and selecting a light ray reaching the selected structure from among the transmitted light rays; and the selected structure and the selected light ray It may be configured to include a propagation characteristic predictor 750 for predicting the propagation characteristics by using.

First, the structure database 710 for the region for which the propagation model is to be generated may be a database that defines a two-dimensional structure for the region for generating the propagation model, or may be a database that defines a three-dimensional structure. . For example, a two-dimensional structure database may be used to quickly generate a propagation model in a simplified manner, or a structure database defining the position and height of a structure may be used to generate a more accurate and detailed propagation model. . In other words, the required structure database may be selected in consideration of the necessity of generating the propagation model.

Next, the transmission point setting unit 720 for setting the transmission point for transmitting the radio wave from the structure database refers to setting the transmission point for transmitting the radio wave at a specific position in the structure database. As a result, the propagation model generating apparatus may be executed based on the transmission point for transmitting the radio wave in the structure database and the structure database.

Next, the structure selecting unit 730 for selecting a structure within a critical distance from the set sending point in the structure database and within a threshold distance from the set sending point is a light beam to be transmitted based on the sending point. This means selecting a structure existing at a position that can be reached in this straight line direction, and selecting a structure that falls within a critical distance from the transmission point among the structures. It may be to select a structure that satisfies both conditions.

Here, the threshold distance may be a distance at which the intensity of the transmitted light ray is maintained above a predetermined intensity value, and the angle between neighboring light rays in the plurality of predetermined light rays may be changed.

Next, the light beam selection unit 740 which transmits a plurality of light rays predetermined in the set transmission point with respect to the selected structure, and selects a light beam reaching the selected structure from the transmitted light beam is the selected structure It may be to transmit a plurality of light rays predetermined at the transmission point with respect to, and to select only the light rays that reach the selected structure from the transmitted light rays. That is, except for the light beams that cannot reach the selected structure, the light beams reaching the structure may be used to generate the propagation model.

Here, the angle between neighboring light rays in the predetermined plurality of light rays may be changed.

In addition, the structure selecting unit 730 and the light beam selecting unit 740 may be composed of one component. A ray may be sampled by using a transmission point of the structure database 710 and the transmission point setting unit 720 by forming one component.

Next, the propagation characteristic predictor 750 for predicting propagation characteristics by using the selected structure and the selected light beam, designates a reception point based on a transmission point in order to predict the propagation characteristic at. It is necessary to comprehensively consider whether the arrival due to reflection, etc., and the attenuation of the propagation intensity, etc. are repeated. And comprehensive prediction.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

1 is a flowchart illustrating a ray sampling method according to an embodiment of the present invention.

2 is an exemplary view for explaining a structure that can be reached in a single straight line from the emitting point in the ray sampling method according to an embodiment of the present invention.

3 is an exemplary view for explaining a structure within a critical distance from a transmitting point in the ray sampling method according to an embodiment of the present invention.

4 is an exemplary diagram for describing the transmission of a plurality of light rays at the emission point in the ray sampling method according to an embodiment of the present invention.

FIG. 5 is an exemplary diagram for describing reaching a structure selected from light rays emitted by a light ray sampling method according to an exemplary embodiment of the present invention.

6 is a flowchart illustrating a propagation model generation method according to an embodiment of the present invention.

7 is a block diagram illustrating an apparatus for generating a propagation model according to an embodiment of the present invention.

Description of the Related Art

700: propagation model generator 710: structure database

720: discharge point setting unit 730: structure selection unit

740: ray selector 750: propagation characteristic predictor

Claims (10)

In the light ray sampling method using a structure database having a transmission point for transmitting light rays, Selecting a structure in the structure database that is reachable in a single straight line from the sending point and is within a critical distance from the sending point; And And transmitting a plurality of light rays predetermined at the transmission point to the selected structure, and selecting a light ray reaching the selected structure from the transmitted light rays. The method of claim 1, And the threshold distance is a distance at which the intensity of the transmitted ray is maintained above a predetermined intensity value. The method of claim 1, And an angle between neighboring light beams in the predetermined plurality of light beams can be changed. In the propagation model generation method using a structure database, Setting a transmission point for transmitting radio waves in the structure database; Sampling a light ray based on the set emission point; And Predicting propagation characteristics using the sampled light rays. 5. The method of claim 4, Sampling the light ray based on the set emission point Selecting a structure within the structure database that is reachable in a single straight line from the set sending point and is within a critical distance from the set sending point; And And transmitting a plurality of predetermined light beams at the set transmission point with respect to the selected structure, and selecting a light beam reaching the selected structure from the transmitted light beams. . The method of claim 5, The threshold distance is a propagation model generation method characterized in that the intensity of the transmitted light beam is maintained above a predetermined intensity value. The method of claim 5, And the angle between neighboring light beams in the predetermined plurality of light beams can be changed. A structure database for a region for which a propagation model is to be generated; A transmission point setting unit for setting a transmission point for transmitting radio waves from the structure database; A structure selecting unit configured to select a structure within the critical distance from the set sending point in the structure database and reachable in a single straight line; A ray selecting unit configured to emit a plurality of predetermined rays of light at the set transmission point with respect to the selected structure, and to select a ray reaching the selected structure from among the transmitted rays; And And a propagation characteristic predictor configured to predict the propagation characteristic using the selected structure and the selected light beam. The method of claim 8, And the threshold distance is a distance at which the intensity of the transmitted ray is maintained above a predetermined intensity value. The method of claim 8, The propagation model generating apparatus of claim 2, wherein the angle between neighboring light beams in the plurality of predetermined light beams may be changed.

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