KR100614408B1 - Method of point-to-point prediction using ray struct - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a point-to-point propagation analysis method using a light beam structure and a computer-readable recording medium having recorded thereon a program for realizing the method.

2. The technical problem to be solved by the invention

The present invention implements a point-to-point radio wave analysis function on a radio network design tool in a radio network design system, and thus provides a point-to-point radio wave characteristic environment through radio wave analysis using actual vector data in the urban microcell / picocell and indoor radio wave environment. To provide a point-to-point radio wave analysis method for performing a more accurate radio wave analysis in consideration of the present invention and a computer-readable recording medium recording a program for realizing the method.

3. Summary of Solution to Invention

The present invention relates to a radio wave analysis method in a radio network design system, in which a ray-launching technique is applied to a radio network design tool to perform point-to-point radio wave analysis. Direct / reflected wave of the path information from the Tx to the receiving wall with the direct wave, the reflected wave, and the diffracted wave after encountering the reflective wall surface or the corner point of the inner city building in the microcell / picocell. Defining and assigning structures for (Ray) and diffraction waves (Subray) to memory; And direct / reflected and diffracted waves emitted from the transmission antenna (Tx) and diffracted waves emitted from the diffraction point are directly received / reflected and diffracted to the reception antenna (Rx). / Storing in the reflected wave structure and the diffraction wave structure, and performing a point-to-point propagation analysis based on the direct / reflected wave structure and the diffraction wave structure.

4. Important uses of the invention

The present invention is used in radio network design tools and the like.

Ray-launching, wireless network design, radio wave analysis, diffraction point, structure

Description

Method of point-to-point propagation analysis using ray structs {Method of point-to-point prediction using ray struct}             

1 is an exemplary configuration diagram of a general wireless network design system.

FIG. 2 is an exemplary view for explaining a propagation mechanism along a ray path in general ray-launching. FIG.

3 is an exemplary view for explaining a light beam structure according to each propagation mechanism used in the present invention.

Figure 4 is an example for explaining the angle used in the reflection and diffraction coefficient calculation used in the present invention.

FIG. 5 is an exemplary diagram for explaining the configuration of light beam structures and memory allocation used in the present invention. FIG.

Figure 6 is a flow diagram of an embodiment of the point-to-point propagation analysis method using a light beam structure according to the present invention.

* Explanation of symbols for the main parts of the drawings

11 input unit 12 output unit

13 central processing unit 14 storage unit

The present invention is a point-to-point propagation analysis method using a ray-launching model technique when developing a wireless network design tool considering a indoor microcell / picocell and indoor radio environment using vector data of a building in a wireless network design system. The present invention relates to a computer-readable recording medium having recorded thereon a program for realizing this.

1 is an exemplary configuration diagram of a general wireless network design system.

As shown in FIG. 1, a general wireless network design system includes an input unit 11, an output unit 12, a central processing unit 13, and a storage unit 14.

Here, the input unit 11 receives data from the user for the wireless network design, the output unit 12 presents the user's input result, the processing result in the central processing unit 13 to the user.

The storage unit 14 stores Geographic Information System (GIS) data such as building data, topographical data, and city coordinates in the form of a database (DB) for designing a wireless network. In addition, the central processing unit 13 processes various tasks for the wireless network design using the data stored in the storage unit 14 at the request of the user.

In general, the radio wave environment in the city has unique values such as the arrangement of the building, the width of the building, the height of the building, the material of the building, and the direction of the building. Thus, ray-launching is a radio wave analysis method to consider these various characteristics. Many techniques are used. The beam emission technique calculates the intensity of the received radio wave considering the effects of reflection, diffraction, etc., which the radio wave experiences until it reaches a receiving point by emitting a ray at a predetermined distance from the transmitting antenna.

Therefore, there is an active research on the method of finding out whether all the reflection points, diffraction points within a radio wave analysis radius generated by one ray and whether the ray and the reception point intersect.

Each propagation mechanism in the ray-launching technique as described above will be described in more detail with reference to FIG. 2.

FIG. 2 illustrates an example in which a ray ray emitted from a transmitting antenna Tx is received by the receiving antenna Rx by a propagation mechanism such as a direct wave, a diffraction wave, a reflected wave, and the like as the light rays 2a, 2b, and 2c, respectively. It seems.

Light beam 2a is a direct beam emitted from the transmitting antenna Tx and received directly to the receiving antenna Rx, and the light beam 2b is emitted from the transmitting antenna Tx and hits the corner point of the building. Is a diffraction wave scattered at a predetermined distance from the new radio source and received by the receiving antenna Rx, and the light beam 2c is reflected on the wall of the building and received by the receiving antenna Rx. to be.

The ray-launching technique provides a method for further developing the function of the wireless network design system by providing more accurate results of urban radio wave environment characteristics than the measurement and empirical model. On the contrary, as the number of buildings and reception points in urban radio environment increases, and the firing angle becomes more dense, the number of rays increases, so the computational amount increases exponentially, so much time is required for radio wave analysis between transmission points (Tx) and receiving points. This takes

Therefore, when developing wireless network design tool considering urban microcell / picocell and indoor propagation environment using vector data of building, a more accurate propagation analysis method considering ray-launching model technique is considered. It is required.

The present invention devised to solve the problems as described above, by implementing a point-to-point radio wave analysis function on the radio network design tool in the radio network design system, the actual vector data in the urban microcell / picocell and indoor radio environment The purpose of the present invention is to provide a point-to-point radio wave analysis method for performing more accurate radio wave analysis in consideration of point-to-point radio wave characteristic environment and a computer-readable recording medium recording a program for realizing the method. .

The present invention for achieving the above object, in the radio wave analysis method in a radio network design system, in order to perform point-to-point wave analysis, ray-launching on a radio network design tool The path from the transmitting antenna (Tx) to light beams, which are sequentially emitted at a certain angle, meets the reflective wall or corner point of the inner city building in the microcell / picocell and reaches the receiving point by direct wave, reflected wave, or diffraction wave, respectively. Defining structures for direct / reflected (Ray) and diffracted (Subray) information and assigning them to memory; And when the direct / reflected wave emitted from the transmitting antenna Tx and the diffracted wave emitted from the diffraction point are received directly / reflected and diffracted by the receiving antenna Rx, the information between these propagation paths is stored and then directly / Performing a point-to-point propagation analysis based on the reflection wave structure and the diffraction wave structure.

In addition, the present invention applies a ray-launching technique on the radio network design tool to perform a point-to-point propagation analysis in a radio network design system having a processor and transmit antenna ( Tx) direct / reflected waves for the path information from the light beams which are sequentially emitted at a certain angle to the reflective wall surface or corner point of the inner city building in the microcell / picocell and reach the receiving point by the direct wave, the reflected wave, and the diffraction wave, respectively. Defining and assigning structures to Ray and Diffraction Waves to memory; And direct / reflected and diffracted waves emitted from the transmission antenna (Tx) and diffracted waves emitted from the diffraction point are directly received / reflected and diffracted to the reception antenna (Rx). A computer readable recording medium storing a reflection structure and a diffraction wave structure and recording a program for realizing a function of performing point-to-point propagation analysis on the basis of the direct / reflection wave structure and the diffraction wave structure. .

The present invention relates to a method of implementing a point-to-point radio wave analysis function using a ray-launching model technique in the development of a wireless network design tool considering indoor microcells / picocells and indoor propagation environment using vector data of a building. Defines an efficient Ray structure that can store various information about the reflection of the reflection and diffraction point by the building on the propagation path, the incident angle, the number of reflection before and after diffraction, the reception status, etc. In order to provide the point-to-point radio wave analysis function by applying the ray-launching model technique to the wireless network design tool by calculating the radio wave strength and time delay for each received ray.

To this end, the present invention uses a ray-launching technique to efficiently perform point-to-point propagation analysis in a wireless network design tool. The ray structure is used to define information on the path from the inner wall of the cell to the reflection wall or corner point and reach the receiving point with direct wave, reflected wave, and diffraction wave, respectively. Save the data. Thus, the present invention can be used for a wireless network design tool for performing radio wave analysis using vector data of a building.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is an exemplary view illustrating a light beam structure according to each propagation mechanism used in the present invention, in which a ray emitted from a transmitting antenna Tx is diffracted at a corner of a building and received at a receiving antenna Rx. Two types of diffracted rays are shown.

As shown in FIG. 3, when a ray meets an edge of the building, the edge becomes a diffraction point and emits a ray as a new propagation source at a predetermined distance from the outside angle of the building.

Looking at this in detail.

Looking at the two rays 3a and 3b reaching the diffraction point, the ray 3a is incident directly on the diffraction point of the building directly from the transmitting antenna Tx, and the ray 3b is reflected twice on the wall of the building. It is incident on the diffraction point.

The light beams 3c and 3d show a case in which light beams scattered equally by the light beams 3a and 3b incident on the corners of the building are respectively reflected or directly received by the reception antenna Rx.

As in this case, only the path and angle of the light incident on the diffraction point of the building are different, and the path from the diffraction point to the reception point is always the same. Therefore, the calculation of whether the receiver receives the diffraction waves by the same diffraction point is 1 You only have to do it once.

4 is an exemplary view for explaining the angle used in the reflection and diffraction coefficient calculation used in the present invention, the incident angle (θ _i ) and diffraction used to calculate the reflection coefficient in the Ray and Subray structure of the reflected wave and diffraction wave The incidence and diffraction angles used to calculate the coefficients are shown.

In the calculation of the reflection coefficient, the angle of incidence is the angle at which the ray Ray incident on the incident surface formed by the incident wave and the surface perpendicular to the reflective surface forms the vertical vector of the reflective surface.

In the calculation of the diffraction coefficient, the incident wave angle for calculating the diffraction coefficient is the clockwise angle for the incident point and the diffraction point, respectively, based on the "0-face surface" of the edge of the building where the diffraction point is formed. ψ _Inc and the diffraction wave angle ψ _Dfc .

FIG. 5 is an exemplary view for explaining the structure of the light beam structure and the memory allocation used in the present invention. FIG. 5 is applicable to the microcell / picocell and indoor propagation environment using urban building vector data to be solved in the present invention. It shows the memory allocation structure and C ++ code of the Ray structure for efficient point-to-point propagation.

This structure makes it easy to store path information about Rays emitted from the transmit antenna (Tx). Therefore, as shown in the example of FIG. 3, the point-to-point radio wave analysis function is effectively performed in the wireless network design tool by using information on whether the ray Ray emitted from the transmission antenna Tx is received by the reception antenna Rx. Can be implemented.

In FIG. 5, "5a" denotes a new propagation when hitting the starting point (Tx), the reflection point, the coordinates and the incident angle, the number of reflections, the reception, and the diffraction point of all the rays Ray emitted from the transmission antenna Tx. "5b" is the structure defining the member variable for the circle, and "5b" is the coordinates of the starting point (diffraction point), the reflection point, and the end point for the ray emitted from the new wave source, the diffraction point, the incident angle, the number of reflections, and the reception. Structure that defines member variables for whether or not. And "5c" and "5d" are parts for allocating the memory of the structure for "5a" and "5b", respectively.

Therefore, when using such a structure, in the point-to-point propagation analysis, calculation of reception propagation strength and time delay using only the information of Ray for the case where the bHit value is "true" This can be done efficiently.

FIG. 6 is a flowchart illustrating a point-to-point propagation analysis method using a light beam structure according to the present invention, and illustrates an example of an efficient ray-launching technique for point-to-point propagation analysis on a wireless network design tool.

As shown in FIG. 6, in the point-to-point propagation analysis method using the light ray structure according to the present invention, a ray structure for a reflected wave is directly allocated to a memory as shown in FIG. 5A, and a light ray corresponding to each ray structure is transmitted to a transmission antenna. It is fired 601 by the number of times (360 / α = N) with a constant separation angle (α angle) from Tx.

Subsequently, it is determined whether there is an obstacle in a direction in which the ray Ray travels for each ray 602.

As a result, when Ray meets the building, it checks whether the building collides with the diffraction point of the building (603), and when received at the diffraction point of the building, the diffraction point is followed (604,605) below the permissible diffraction number. If not, it is determined whether the number of reflections is less than or equal to the allowed reflection number (606). If the number of reflections is less than or equal to the allowed reflection number, the multi-reflection routine is followed (607). At this time, the reflection routine calculates the reflection point coordinates (Point2D [n] [0], Point2D [n] [1]), the incident angle (IncidentAngle [n]), and the reflection frequency (n_ReflBefore). It is determined whether the reception antenna Rx is received (bHit == TRUE) (608).

In this process, multiple reflection routines are carried out up to the maximum allowable reflection number, and after each reflection path section, it is determined whether the reception antenna (RH) is received (bHit == TRUE), and then the ray is received using only the final bHit value. It is determined whether it is received at (Rx). At this time, the ray Ray having the value "bHit == FALSE" is ignored.

횟수만큼 발사된다. In the diffraction routine, a subray structure for diffraction waves such as "5b" of FIG. 5 is allocated to a memory, and a subray corresponding to each subray structure has a predetermined separation angle (α angle) from a diffraction point inside the building at 360 degrees. Divided by the interior angle minus the interior angle

Fired a number of times.

And, in the case of diffraction, from the coordinate value of the reflection point before the diffraction (or Tx when incident directly into the diffraction point from Tx) from the incident angle with respect to 0-face and the coordinate value of the reflection point after diffraction (or Rx when directly received by Rx) The diffraction angle calculation and reflection count (n_ReflAfter) for the 0-face are increased and it is determined whether the reception antenna Rx is received within the propagation path on the routine.

Finally, the Ray structure Boolean variable bHit is set to TRUE only when the rays Ray emitted from the transmitting antenna Tx are received by the receiving antenna Rx in the form of direct wave, reflected wave, and diffraction wave, respectively. Since only these rays are considered, it is easy to analyze the radio network design parameters required for point-to-point propagation analysis.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to drawings.

As described above, the present invention considers point-to-point propagation characteristics through radio wave analysis using real vector data in urban microcell / picocell and indoor propagation environment by implementing point-to-point propagation analysis function on wireless network design tool. There is an effect that can perform a more accurate radio wave analysis.

Claims (6)

In the radio wave analysis method in the wireless network design system, In order to perform point-to-point radio wave analysis, a ray-launching technique is applied to a wireless network design tool, and light rays sequentially emitted from a transmission antenna (Tx) at a predetermined angle are microcell / Defines the structure of direct / reflection wave and sub-ray diffraction wave for the path information from the reflecting wall surface or corner point of the city building in the picocell to the receiving point with the direct wave, reflected wave and diffraction wave respectively. Assigning to; And When the direct / reflected wave emitted from the transmitting antenna Tx and the diffracted wave emitted at the diffraction point are received directly / reflected and diffracted to the receiving antenna Rx, the inter-path propagation information for all the light beams is received. Storing in the reflected wave structure and the diffraction wave structure and performing point-to-point propagation analysis based on the direct / reflected wave structure and the diffraction wave structure Point-to-point propagation analysis method using a light beam structure comprising a. The method of claim 1, The information between the propagation paths, Point-to-point propagation analysis method using a light beam structure, characterized in that the coordinates of the reflection and diffraction points, the incident angle, the number of reflection and diffraction, the reception information. The method of claim 1, When considering the point-to-point radio wave analysis, Point-to-point propagation analysis method using a light beam structure, characterized in that the received radio wave strength, time delay information. The method according to any one of claims 1 to 3, The direct / reflective wave structure, A structure defining a member variable for a new radio source when hitting the starting point, the reflection point, the coordinates of the ray, the incident angle, the number of reflections, the reception, and the diffraction point of all the rays emitted from the transmission antenna Tx. Point-to-point propagation analysis method using a light beam structure, characterized in that. The method according to any one of claims 1 to 3, The diffraction wave structure, Substantially, it is a structure defining the start point (diffraction point), the reflection point, the coordinate value of the end point, the incident angle, the number of reflections, and the member variables for the ray emitted from the new wave source, which is a diffraction point. Point-to-point propagation analysis method using a light ray structure. In a wireless network design system having a processor, In order to perform point-to-point radio wave analysis, a ray-launching technique is applied to a wireless network design tool, and light rays sequentially emitted from a transmission antenna (Tx) at a predetermined angle are microcell / Defines the structure of direct / reflection wave and sub-ray diffraction wave for the path information from the reflecting wall surface or corner point of the city building in the picocell to the receiving point with the direct wave, reflected wave and diffraction wave respectively. Function to assign to; And When the direct / reflected wave emitted from the transmitting antenna Tx and the diffracted wave emitted at the diffraction point are received directly / reflected and diffracted to the receiving antenna Rx, the inter-path propagation information for all the light beams is received. Store in the reflected wave structure and the diffraction wave structure, and perform a point-to-point propagation analysis based on the direct / reflected wave structure and the diffraction wave structure A computer-readable recording medium having recorded thereon a program for realizing this.

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