JP2010187140A - Communication characteristics analysis system, communication characteristics analysis method, and communicating characteristics analysis program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide information which is useful for installation design by enhancing the analysis accuracy of communication characteristics while minimizing the computational complexity and specifying the local dead areas. <P>SOLUTION: The communication characteristics analysis method includes a step (S2) of determining the area attributes of metropolis, local city and country based on the maximum population of the area to be analyzed, a step of receiving designation of a target building out of buildings in the area to be analyzed, steps (S3-S5) of performing local analysis of the communication characteristics of a target building by searching any one analysis method of Quota analysis, topological analysis or topographical analysis associated with the area attributes thus determined, and a step (S6) of correcting the reference estimation value (A value) in the area to be analyzed based on the analysis results and outputting the correction value as the communication characteristics value of the target building. A required installation solution is output according to the corrected communication characteristics value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless communication characteristic analysis system, a communication characteristic analysis method, and a communication characteristic analysis program for causing a computer system to execute the analysis method used for base station installation design (station placement design) in a mobile wireless communication system.

  Conventionally, in station design, the measured values of indoor and outdoor communication environments collected by electric vehicles, area testers, and experimental stations are used in combination with simulation results (estimated values) of radio wave propagation characteristics by computer. In many cases, the type of station, the installation location candidate, and the like are determined (Non-Patent Document 1). In this computer simulation, generally, wireless communication characteristics such as a radio wave propagation path and propagation loss are calculated based on geographical information such as terrain and buildings and specifications of base stations.

  In the simulation, in order to improve the analysis accuracy, a plurality of analysis methods are used properly in consideration of regional characteristics of the calculation target area. For example, Patent Literature 1 below discloses that the Sakagami model is used for urban areas and the Okumura-Kashiwa formula is used for suburban areas (paragraph [0029]). Further, in Non-Patent Documents 2 and 3 below, a plurality of radio waves such as a ray trace (ray launching method), Okumura-Kashiwa type, Sakagami model, free space type, etc., for a plurality of radio wave propagation environments such as cities, suburbs, and indoors. It is disclosed that an optimal model is selected from a propagation estimation model and radio wave propagation simulation is performed.

  In other words, statistical analysis methods such as Okumura-Kashiwa formula and free space formula can perform high-speed simulation with high accuracy in suburbs where there are few shields and the base station has a wide line-of-sight area. In urban areas where there are many structures and objects that give the desired accuracy, there is a problem that desired accuracy cannot be obtained. Therefore, it is effective to analyze urban areas using semi-empirical formulas such as the Sakagami model and deterministic analysis methods such as ray tracing methods (ray launching methods and imaging methods).

  Patent Document 2 discloses an invention that can reduce the amount of calculation processing when estimating the reception characteristics of radio waves in a service area using an imaging method. The present invention receives from a transmission point only by considering structures (buildings, etc.) existing within the line of sight from the transmission point (base station) and structures existing within line of sight from the reception point (mobile station). The object of tracing the path of the radio wave (ray) to the point is minimized, and the calculation processing is greatly speeded up (claim 1, paragraph [0022], etc.).

  Furthermore, in Patent Document 3, when calculating the line-of-sight ratio within the coverage area of the base station, the line-of-sight side is recognized for the line-of-sight building within the area, and line-of-sight judgment points are set on the straight lines that form this side. The invention is disclosed. Thereby, in this invention, compared with the case where the some grid point and building center point which exist in the roof top plane of a building are set as a determination point, the calculation amount is reduced significantly. In addition, more realistic and highly accurate determination is possible in accordance with a mode in which a radio station antenna is installed on a veranda or a building wall.

"Stationary Design Comprehensive Support System" NTT DoCoMo Technical Journal Vol. 4 No. 1 pp. 28-31 1996-04 http://www.remcom.com/wireless-insite/optional-modules/wireless-insite-rt.html http://www.kke.co.jp/news/2008/pdf/NewsRelease_wireless.pdf

JP 2004-304302 A (paragraph [0029]) Japanese Patent Laying-Open No. 2005-72667 (Claim 1, paragraph [0022]) JP 2006-352551 A (Claim 1, paragraph [0018])

  By the way, in the analysis method in the above-mentioned station design, depending on the ratio (occupied area ratio), height, altitude, etc. where there are shielding objects such as high-rise buildings and undulations in the mesh, The mesh area attributes are determined. Then, the communication characteristics are calculated for each mesh by an analysis method matching the area attribute. Therefore, it is impossible to grasp some local communication characteristics in the mesh.

  Specifically, in the statistical analysis methods such as the Okumura-Kashiwa equation and free space equation described above, the distance between the center point of the mesh and the base station is within the range, and the height and number of floors of the building included in the mesh Is less than or equal to a predetermined value and satisfies the condition that there is no high-rise building on the propagation path, the entire mesh is evaluated as “good communication characteristics” by statistical processing. Therefore, for example, even if the periphery of a low-rise building surrounded on all sides by a middle-rise building with several floors is an insensitive area, verification work based on measured values can be performed when responding to complaints from users, etc. It will not manifest unless done.

  On the other hand, even in a low-rise building adjacent to a high-rise building in the center of a big city, communication characteristics are good if the direction of the nearest base station is a road or a parking lot. Nevertheless, if the deterministic analysis method described above is applied as it is, the entire mesh including the low-rise building may be evaluated as a “necessary countermeasure area”. As a result, it is necessary to take measures to eliminate the dead area (actual measurement in the field, new installation of base stations and repeaters, interference adjustment between base stations, sector direction and output adjustment, etc.).

  Here, in order to specify the insensitive area, the unit of mesh division is reduced (approximately several meters), the analysis unit of communication characteristics is not a mesh but a building unit, or the communication characteristics of the mesh with reference to measured data It is also possible to verify the estimated value of.

  However, even if the unit of mesh division is reduced, there is a limit to improving the analysis accuracy as long as the area attribute judgment method and the analysis method selection criteria are the same. Is not an effective measure.

  Further, it is not realistic to analyze the communication characteristics in units of buildings in detail because it will analyze all the properties that have tens of millions in Japan, and it will take enormous costs and time. Note that the analysis target narrowing disclosed in Patent Documents 2 and 3 described above is a method for narrowing down the analysis target building from which the installation candidate area such as a base station, that is, the insensitive area is specified, It cannot be applied when narrowing down the analysis target from tens of millions.

  Furthermore, when verifying the estimated value by referring to the actual measurement data, if the mesh is divided into 50 to 500 m square, the total number of meshes will be over 1.5 million in Japan alone. It is not realistic to verify the estimated value of the characteristic. Further, in order to reduce the calculation amount and cost, narrowing down the mesh to be verified randomly or according to a specific standard is only a trade-off with the accuracy of insensitive area, and is not a fundamental measure.

  The present invention has been made in order to solve the above-described problems, and improves the analysis accuracy of the communication characteristics while minimizing the amount of calculation to identify the local insensitive area, which is useful for station placement design. An object is to provide a communication characteristic analysis system capable of providing information, a communication characteristic analysis method, and a communication characteristic analysis program for causing a computer to execute the method.

  In order to solve the above-described problem, a communication characteristic analysis system according to an embodiment of the present invention includes an area attribute determination reference storage unit, an analysis method storage unit, a reference estimated value storage unit, an area attribute determination unit, and a target building. The specifying means and the pole location analyzing means are provided.

The area attribute determination criterion storage unit stores a determination criterion for determining an area attribute of a certain area on the map. This area attribute is classified into two or more based on the thing data or statistical data of the area.
The analysis method storage unit stores a plurality of communication point analysis methods in association with the area attribute.
The reference estimated value storage unit stores estimated values of communication characteristics (hereinafter referred to as “reference estimated values”) calculated by a method different from the plurality of local analysis methods stored in the analysis method storage unit. The reference estimated value is calculated for each certain area on the map and stored in the reference estimated value storage unit in association with the area.
The area attribute determination means determines an area attribute for the analysis target area selected from the areas according to the area attribute determination criterion. This area attribute is determined based on the thing data or statistical data of the area.
The target building specifying means accepts designation of a building (hereinafter referred to as “target building”) to be subjected to polar analysis from among the buildings existing in the analysis target area.
The location analysis means retrieves the location analysis method associated with the discriminated area attribute from the analysis method storage unit. This local analysis means analyzes the communication characteristics of the target building. Further, the pole analyzing means outputs a value obtained by correcting the reference estimated value of the analysis target area based on the result of the pole analysis as a communication characteristic value of the target building.
Here, “polar analysis” in this specification refers to a process of individually analyzing or correcting communication characteristics of a specific building, not an area of a predetermined area such as a mesh, regardless of the analysis method.

  A communication characteristic analysis system according to another aspect of the present invention includes an area attribute determination reference storage unit, an analysis method storage unit, an area attribute determination unit, and a pole location analysis unit.

The area attribute determination criterion storage unit stores a determination criterion for determining an area attribute of a certain area on the map. This area attribute is classified into two or more based on the thing data or statistical data of the area.
The analysis method storage unit stores a plurality of local analysis methods of communication characteristics including topology analysis, quarter analysis, or topographic analysis in association with the area attribute.
The area attribute determination means determines an area attribute for the analysis target area selected from the areas according to the area attribute determination criterion. This area attribute is determined based on the thing data or statistical data of the area.
The pole analysis means searches the analysis method storage unit for an analysis method associated with the discriminated area attribute. This analysis means analyzes the communication characteristics of the analysis target area by the specified analysis method.

A communication characteristic analysis method according to another aspect of the present invention is realized by a computer in which a storage device stores an area attribute discrimination criterion, a communication characteristic analysis method, and an estimated value (reference estimated value) of the communication characteristic. The
This communication characteristic analysis method includes an area attribute determination step, a target building identification step, and a pole location analysis step.

The area attribute determination criterion is a determination criterion for determining an area attribute of a certain area on the map. This area attribute is classified into two or more based on the thing data or statistical data of the area.
The analysis method of communication characteristics is a plurality of local analysis methods of communication characteristics. This analysis method is associated with the area attribute.
The reference estimated value is calculated by a method different from the above-described method for analyzing the communication characteristic location. This reference estimated value is calculated for each fixed area on the map.
The area attribute determining step determines an area attribute for the analysis target area selected from the areas according to the area attribute determining criterion. In the area attribute determination step, the area attribute is determined based on the thing data or statistical data of the area.
The target building specifying step accepts designation of a building (hereinafter referred to as “target building”) to be subjected to polar analysis from among the buildings existing in the analysis target area.
In the location analysis step, the location analysis method associated with the discriminated area attribute is searched from the storage device. In this local analysis step, the communication characteristics of the target building are analyzed locally. In this local analysis step, the reference estimated value of the analysis target area is corrected based on the result of the local analysis. Then, the pole location analysis step outputs the corrected value as the communication characteristic value of the target building.

  According to another aspect of the present invention, there is provided a communication characteristic analysis program that stores an area attribute discrimination criterion, a communication characteristic analysis method, and a communication characteristic estimation value (reference estimation value) in a storage device. An attribute discrimination step, a target building identification step, and a pole location analysis step are executed.

The area attribute determination criterion is a determination criterion for determining an area attribute of a certain area on the map. This area attribute is classified into two or more based on the thing data or statistical data of the area.
The analysis method of communication characteristics is a plurality of local analysis methods of communication characteristics. This analysis method is associated with the area attribute.
The reference estimated value is calculated by a method different from the above-described method for analyzing the communication characteristic location. This reference estimated value is calculated for each fixed area on the map.
The area attribute determining step determines an area attribute for the analysis target area selected from the areas according to the area attribute determining criterion. In the area attribute determination step, the area attribute is determined based on the thing data or statistical data of the area.
The target building specifying step accepts designation of a building (hereinafter referred to as “target building”) to be subjected to polar analysis from among the buildings existing in the analysis target area.
In the location analysis step, the location analysis method associated with the discriminated area attribute is searched from the storage device. In this local analysis step, the communication characteristics of the target building are analyzed locally. In this local analysis step, the reference estimated value of the analysis target area is corrected based on the result of the local analysis. Then, the pole location analysis step outputs the corrected value as the communication characteristic value of the target building.

FIG. 1 is a schematic diagram showing a hierarchical structure of map data in a communication characteristic analysis system according to an embodiment of the present invention. FIG. 2 is also a diagram showing a mesh structure of map data. FIG. 3 is a flowchart showing the overall processing steps. FIG. 4 is a schematic diagram for explaining the quota analysis. FIG. 5 is a diagram illustrating an example of the sector type in the quota analysis. FIG. 6 is a diagram illustrating an example of conditions and correction values for each sector type in the quota analysis. FIG. 7 is a diagram illustrating an example of a topology shape in the topology analysis. FIG. 8 is a schematic diagram for explaining the conditions of the shielded building and the shielding rate in the topology analysis. FIG. 9 is a diagram illustrating an example of conditions and correction values for each topology shape in the topology analysis. FIG. 10 is a diagram for explaining the irradiation partial shielding rate in the topology analysis. FIG. 11 is a diagram illustrating an example of a terrain object in the terrain analysis. FIG. 12 is a diagram showing a hardware configuration of a communication characteristic analysis system according to an embodiment of the present invention. FIG. 13 is a block diagram schematically showing a software configuration and a data configuration. FIG. 14 is a block diagram schematically showing the configuration of the analysis system according to the second embodiment of the present invention. FIG. 15 is a graph showing a verification result comparing the analysis result (A value) by the conventional RF simulator and the local analysis correction value by the analysis system according to the present embodiment with the actual measurement value. FIG. 16 is a graph showing a verification result comparing the result of the pole analysis in the large city with the actual measurement value. FIG. 17 is a diagram illustrating correction results of open type and I type topology analysis. FIG. 18 is a table showing correction results of L-type, parallel-type, three-way, and four-way topology analysis. FIG. 19 is a graph showing a correction result for each of a plurality of sector patterns in the quota analysis. FIG. 20 is a graph showing a correction result for each of a plurality of terrain patterns in the terrain analysis.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The present invention is to make it possible to efficiently execute highly accurate placement design using a geographic information system (GIS). This GIS integrates the management and processing of digitized map (terrain) data and statistical data and location-related data such as attribute information for advanced analysis and analysis, visual It is a system that displays automatically. The GIS includes a database in which map data and other data are associated with each other, and a computer program that searches, analyzes, and displays the information.

Here, the map data in the present embodiment has a hierarchical structure in which a plurality of the following data layers (layers) are associated with each other and overlapped with the basic map data layer, as shown in FIG.
1) Population / household data layer such as daytime population and nighttime population and number of households for each mesh 2) NG area data layer showing areas where measured values of communication characteristics are below the standard value 3) Calculated for each mesh by existing RF simulator 4) RSCP (Received Signal Code Power) data layer calculated for each mesh based on simulation data 5) Building data layer 6) such as building height and floor area Base station data layer such as base station installation position, height, output level and device type 7) Customer data layer such as contractor's address / building name 8) Complaints related to communication characteristics such as “difficult to connect” and “cut right away” The location where the customer's address and the record of correspondence recorded, etc., and the communication equipment to improve the communication environment in an extreme place Improved claims data layer 9, such as equipment data) churn's address that identifies the churn data layer, such as a cancellation date

  As shown in FIG. 2, the basic map data layer described above is divided into a number of meshes having different areas according to population density, building density, and the like. As an example, if the mesh unit is 500 m, it is divided into about 1.5 million meshes throughout Japan. Of these, about 500,000 mesh, which is a stationary / unsteady residential area, can be an analysis target area of communication characteristics. FIG. 1 is an enlarged view of a part of the mesh shown in FIG. In addition, the NG area indicated by a thick line in FIG. 2 is a mesh group that is a candidate for the local analysis described later.

(Outline of Preferred Embodiment of the Present Invention)
In a preferred embodiment of the present invention, the analysis method storage unit stores topology analysis, quota analysis, or terrain analysis in association with the area attribute as a local analysis method. In any of the local analysis methods, the reference estimated value obtained by the statistical analysis method can be accurately corrected according to the area attribute.

In a preferred embodiment of the present invention, a map data storage unit is provided. The map data storage unit stores map data including basic map data, population / household data, and building data.
The area attribute discrimination criterion storage unit stores discrimination criteria for discriminating two or more area attributes that are classified based on thing data or statistical data of population, household or building in the area.
The area attribute determining means determines the area attribute of the analysis target area based on the population / household data and building data in the map data storage unit.
According to such a configuration, for example, a plurality of area attributes can be instantaneously determined based on statistical data such as population and the number of buildings.

In a preferred embodiment of the present invention, the map data storage unit stores building data and / or population / household data for each area obtained by dividing the basic map data by a predetermined range.
The area attribute discrimination standard storage unit determines the area attributes of “large cities”, “local cities”, and “countries”, daytime population, nighttime population, maximum population between daytime and nighttime, population density, and density of buildings. Stores discriminant criteria based on any data or statistical data of degree, average height, or maximum height.
According to such a configuration, it is possible to determine an area attribute according to a parameter that is likely to affect communication characteristics, and to perform an optimal local analysis according to the attribute. As a result, it is possible to simultaneously narrow down the analysis target area and improve the analysis accuracy by the local analysis.

In another preferred embodiment of the present invention, the analysis method storage unit stores the quota analysis and the topology analysis in association with the area attribute of “large city”, stores the terrain analysis in association with the area attribute of “countryside”, No analysis method is stored in the area attribute of “local city”.
When the area attribute of the analysis target area is determined to be “local city”, the pole analysis means outputs the reference estimated value of the analysis target area as the communication characteristic value of the target building.
With such a configuration, it is possible to correct the reference estimated value only in an area where a local analysis is necessary. Thereby, the amount of calculation can be reduced to the minimum and the calculation speed can be increased.

In another preferred embodiment of the present invention, the analysis method storage unit stores a plurality of analysis methods including topology analysis as the local analysis method. In addition, for topology analysis, a topology shape storage unit for storing a shielding building determination criterion, a plurality of topology shape determination criteria, and a communication characteristic correction value is provided.
The pole analysis means determines the topology shape around the target building with reference to the map data storage unit and the topology shape storage unit. Further, the pole analyzing means outputs a value obtained by correcting the reference estimated value of the analysis target area by the communication characteristic correction value of the topology shape as the communication characteristic value of the target building.
According to the above-mentioned shielding building judgment criteria, whether a building located in the vicinity of any target building (peripheral building) can be a shielding building that blocks radio waves from the base station due to the distance and / or height difference with the target building. It is a standard.
The topology shape determination criterion is a topology shape criterion (establishment condition) obtained by simplifying the outline of one or more shielded buildings.
The communication characteristic correction value is set for each topology shape.
With such a configuration, the communication environment around the target building can be simplified to several patterns, and analysis accuracy can be improved while minimizing the amount of calculation.

In another preferred embodiment of the present invention, the location analysis means includes a building data extraction means, a shielded building determination means, and a topology analysis execution means for topology analysis.
The building data extraction unit extracts the position and height data of the target building and the position and height data of buildings existing around the target building from the building data in the map data storage unit.
The shielded building determination means calculates the distance from the target building and / or the height difference of the extracted surrounding buildings, and determines whether the shielded building determination criterion is satisfied.
The topology analysis execution means determines the topology shape around the target building based on whether there is a shielded building around the target building, and estimates the reference area of the analysis target area based on the communication characteristic correction value of the determined topology shape Correct the value and output it as the communication characteristic value of the target building.
With such a configuration, it is possible to easily execute a local analysis by topology analysis.

In another preferred embodiment of the present invention, the topology shape storage unit includes a plurality of topology shapes classified according to whether a shielded building exists in N directions (0 ≦ N ≦ 4) of the four directions of the target building. Stores the judgment criteria.
The topology analysis executing means determines the topology shape by specifying N directions where the shielded building exists by referring to the position data of the building determined as the shielded building and the target building.
With such a configuration, the topological shape can be further simplified and the local analysis can be easily performed.

In another preferred embodiment of the present invention, the topology shape storage unit has a ratio of the lengths of the line segments facing the outlines of the surrounding buildings among the outlines of the target building in any direction as the shielding building determination standard. Stores the reference value of (shielding rate).
The building data extraction means extracts the planar shape (outline) of the target building and the surrounding buildings from the building data in the map data storage unit.
The topology analysis execution means calculates a shielding rate in each direction of the target building based on the extracted target building and the outlines of the surrounding buildings. The topology analysis execution means determines the topology shape by determining that there is a shielded building in a direction where the shielding rate exceeds the reference value.
With such a configuration, it is possible to easily perform the local analysis by simplifying various shielding patterns between the target building and the surrounding buildings.

In another preferred embodiment of the present invention, the map data storage unit stores base station data including the position of the base station for topology analysis.
The topology shape storage unit stores at least one communication characteristic correction value depending on whether the direction of the base station is shielded by a shielded building or not when the topology shape is open in at least one plan view. To do.
The topology analysis execution means refers to the base station data, determines whether the direction of the base station having the determined topology shape is shielded / opened, and extracts the communication characteristic correction value from the topology shape storage unit.
With such a configuration, different correction values can be output for the same topology shape in accordance with the positional relationship with the base station, and the accuracy of the pole location analysis can be further improved.

In another preferred embodiment of the present invention, the analysis method storage unit stores a plurality of analysis methods including a quota analysis as a local analysis method. In addition, a sector communication characteristic correction value storage unit is provided for quota analysis.
The map data storage unit stores base station data including the position of the base station.
The sector communication characteristic correction value storage unit stores the number of buildings in a sector obtained by equally dividing a virtual circle with a predetermined radius centered on an arbitrary building, the number of buildings with respect to the sector area (density), or the sector area. A communication characteristic correction value set based on the ratio of the total floor area of the building (building ratio) and the direction of the base station including the arbitrary building in the communication area is stored.
The pole analysis means extracts the communication characteristic correction value of the sector with reference to the map data storage unit and the sector communication characteristic correction value storage unit. Further, the pole analyzing means outputs a value obtained by correcting the reference estimated value of the analysis target area by the sector communication characteristic correction value as the communication characteristic value of the target building.
With such a configuration, it is possible to easily realize the local analysis by the quarter analysis. In addition, by executing this quota analysis in combination with the topology analysis described above, it is possible to further improve the analysis accuracy in a large city where local communication characteristics are likely to vary.

In another preferred embodiment of the present invention, the pole location analysis means includes building data extraction means, base station data identification means, and sector communication characteristic correction value extraction means for quota analysis.
The building data extracting means equally divides a virtual circle centered on the target building into four sectors, and extracts building data in each sector with reference to the basic map data and building data in the map data storage unit.
The intra-sector building data calculation means calculates the number of buildings in the sector, the building density or the building ratio (hereinafter collectively referred to as “in-sector building data”) based on the extracted building data.
The base station data specifying means specifies the position of the base station including the target building in the communication area with reference to the base station data in the map data storage unit.
The sector communication characteristic correction value extracting means extracts the communication characteristic correction value of the sector with reference to the building data in the sector and the position of the base station and the sector communication characteristic correction value storage unit.
With such a configuration, the quota analysis can be efficiently executed based on the building data in the sector.

In another preferred embodiment of the present invention, the analysis method storage unit stores a plurality of analysis methods including terrain analysis as the pole location analysis method. In addition, the terrain analysis includes a shielding terrain object storage unit that stores a shielding terrain object determination criterion and a communication characteristic correction value.
The shielding terrain object determination criterion is a criterion for determining whether or not a terrain object existing around an arbitrary target building can be a shielding terrain object that blocks radio waves from a base station including the target building in a communication area. This criterion is at least one of the distance, elevation difference, or elevation angle between the terrain object and the target building, and the distance, elevation difference, or elevation angle between the terrain object and the base station (hereinafter, “terrain object parameter”). And
The communication characteristic correction value is set for each of a plurality of terrain patterns classified according to terrain data such as the shape, size, and height of the shielding terrain object.
The map data storage unit stores base station data including the position of the base station.
The pole analyzing means determines the terrain pattern of the terrain object around the target building with reference to the map data storage unit and the shielding terrain object storage unit. The pole analysis means outputs a value obtained by correcting the reference estimated value of the analysis target area by the communication characteristic correction value of the topographic pattern as the communication characteristic value of the target building.
With such a configuration, it is possible to easily execute a local analysis by topographic analysis.

In another preferred embodiment of the present invention, regarding the terrain analysis, the data extraction means comprising a data extraction means, a shielded terrain object determination means, a terrain pattern determination means, and a communication characteristic value output means comprises: a map data storage unit; Referring to the basic map data, building data, and base station data, the building data of the target building, the base station data of the base station including the target building in the communication area, and the terrain data around the target building are extracted, respectively. .
The occluded terrain object determination means calculates the value of the terrain object parameter based on the extracted data, and applies it to the occluded terrain object determination criterion to determine whether the occluded terrain object exists.
The terrain pattern determining means determines the terrain pattern according to the terrain data of the shielding terrain object.
The communication characteristic value output means retrieves the communication characteristic correction value of the determined terrain pattern from the shielding terrain object storage unit, and outputs the communication characteristic correction value as the communication characteristic value of the target building.
With such a configuration, it is possible to easily execute terrain analysis according to various shielding terrain patterns.

In another preferred embodiment of the present invention, the map data storage unit stores improved device data. This improved device data is data for identifying a point related to a complaint regarding a complaint about the communication environment acquired from a user of the wireless communication service (hereinafter referred to as “claim data”), or for improving the communication environment in an extreme manner. This data identifies the point where the communication device is installed.
This system further comprises analysis target area specifying means. The analysis target area specifying means specifies a specific point on the basic map data based on the claim data or the improvement device data in the map data storage unit, and extracts an area including the specific point as an analysis target area.
The area attribute determining means determines an area attribute for the extracted analysis target area.
With such a configuration, it is possible to estimate the dead area based on the improved device data, to efficiently identify the analysis target area, and to perform the local analysis more efficiently.

In another preferred embodiment of the present invention, an indoor communication characteristic correction value storage unit, a building-specific communication characteristic estimation value storage unit, an indoor communication characteristic correction unit, and an analysis target area selection unit are provided.
The indoor communication characteristic correction value storage unit stores an indoor communication characteristic correction value set in accordance with the size or type of a building (hereinafter collectively referred to as “building type”).
The communication characteristic estimated value storage unit for each building is an estimated value of the communication characteristic of the building on the map data (hereinafter referred to as “communication characteristic estimation for each building” calculated by a method different from the analysis method stored in the analysis method storage unit. Value ") is stored in association with each building.
The indoor communication characteristic correcting means determines the building type of the building by referring to the building data in the map data storage unit, and corrects the building-specific communication characteristic estimated value of the building by the indoor communication characteristic correction value corresponding to the building type. To do.
The analysis target area selecting means selects, as the analysis target area, an area that includes a predetermined number or more of buildings whose corrected communication characteristic estimated values for each building are equal to or less than a predetermined reference value.
With such a configuration, the analysis target area can be narrowed down efficiently and with high accuracy based on the corrected communication characteristic estimation value for each building.

(Overall flow)
Next, the overall flow of this embodiment will be described with reference to FIG.

  S1: First, using analysis software such as a well-known RF simulator, communication characteristics are calculated (simulation) for all meshes in the analysis target area (nationwide, prefectures, states, counties, municipalities, special wards, etc.). (S1). The calculation in this case is performed with reference to building data (floor, height, floor area), topographic data (elevation above sea level, etc.), base station data (position, height, etc.) included in the digital map data.

  As the analysis software, for example, “Atoll” of FORSK of France or the software disclosed in Non-Patent Documents 2 and 3 described above can be used. The calculation result of this analysis software is output in the form of what percentage of the radio wave transmitted from the nearest base station was received and the value (dBm) lost on the propagation path. In this specification, this output value is referred to as a “communication characteristic value”. In addition, in order to distinguish between the output value from the above existing analysis software and the output value after correction processing of the local analysis by this system, the former is “A value” or “estimated value”, the latter is “polar analysis” This is referred to as “value” or “correction value”. In addition, since the analysis method by the existing analysis software is known, detailed description is abbreviate | omitted.

S2: Next, the area attribute of each mesh is determined with reference to the population / household data (statistical data) included in the map data of the mesh (S2). In the present embodiment, the following three attributes are classified according to the maximum value (maximum population) of the daytime population and the nighttime population.
The maximum population of _{N 1} person less than: Countryside maximum population is _{N 1} or more _{N 2} person less than: regional cities maximum population of _{N 2} or more people: big cities

  The “country”, “local city”, and “large city” referred to here are based only on the maximum population in the mesh, regardless of the municipality (address data, etc.) of each administrative division. Therefore, for example, even if the mesh belongs to a large city (Yokohama City, London City, etc.) on the administrative division, a mesh in which non-residential areas such as parks, lakes, rivers, etc. occupy the majority are classified as “countryside”. Sometimes.

  For meshes classified as country or local city, refer to the building data included in the map data, and the density of the building (total floor area / mesh area), average number of floors, maximum number of floors, or more than the specified number of floors It is preferable to calculate or extract matter data such as the number of middle- and high-rise buildings, and to correct meshes whose matter data is greater than or equal to a reference value to local cities and large cities, respectively.

  S3, S4, S5: Next, the above-described A value is corrected locally according to the determined area attribute. Specifically, a quarter analysis and a topology analysis are executed for a mesh in a large city (S3, S4), and a terrain analysis is executed for a mesh in a country (S5). In large cities and rural areas, there are many different objects (buildings, partial undulations of the land, forests, valleys, etc.) that have a large influence on the radio wave propagation characteristics. It is because it is easy to occur. In these polar analysis, designation of an arbitrary target building in the target mesh is accepted from the user, or the target building is specified at random from among low-rise buildings near the center of the mesh.

  On the other hand, regional analysis is not performed for local cities. This is because local cities have few variations in the number and size of buildings in the mesh, and sufficient accuracy can be obtained even with uniform processing using statistical methods. When it is determined that the A value in the local city has a large error based on the verification based on the actual measurement data, the correction process may be performed in the same manner as in the large city or the countryside. Further, the area attribute may be further subdivided into “local city center” and “local city suburb”, and correction processing similar to or different from that of the above-described large city or country may be executed. The “different correction processing” in this case includes a case where correction values and execution conditions are made different by the same analysis method as in a large city or country.

  S6: When the above correction processing is completed, the corrected communication characteristic value is recorded on the map data in association with the address or the like as the local communication characteristic of the target building (S6). If necessary, such correction processing is executed for all buildings in the mesh and all meshes in the NG area.

  S7, S8, S9: Also, the communication characteristic value of the target building is compared with the threshold value (S7), and if it is equal to or less than the threshold value (Yes in S7), the mesh or adjacent area is instructed by the user or according to the program. The above-mentioned locality analysis is executed for other buildings of other meshes to be performed (S8). And it is determined whether the building below a threshold value exists over a some mesh (S9).

  S10, S11: When there are multiple buildings below the threshold across multiple meshes (Yes in S9), a new base station (macro station) or repeater (picocell) is installed, or the output of an existing base station An outdoor countermeasure solution such as adjustment is output in a predetermined format (measure list, fixed message, etc.) (S10). On the other hand, when buildings below the threshold exist only in a local location (No in S9), an indoor countermeasure solution for the target building such as a home antenna, a public repeater, or an indoor base station is output in a predetermined format (S11).

  In this way, enormous calculations for a wide area are processed at high speed with a conventional simulator using statistical methods, etc., and the analysis result (A value) is narrowed down to the correction target mesh in consideration of the mesh area attribute. We decided to execute extreme correction processing with an analysis method suitable for the area attribute. Thereby, it is possible to improve the analysis accuracy while suppressing the calculation amount. In addition, by conducting local analysis on a building-by-building basis, it is possible to extract local insensitive areas according to the surrounding buildings, topographical conditions, and positional relationship with the base station, without using field surveys, etc. New solutions can be proposed quickly.

  Next, the correction processing method based on the above-described local analysis will be described in detail.

(Quota analysis)
First, a quota analysis to be performed on a mesh whose area attribute is “large city” will be described. This quarter analysis is an analysis method in which a virtual circle with a predetermined radius centered on a target building is equally divided into four sectors and a communication characteristic correction value set in advance based on the number of buildings in the sector is output. . This quarter analysis is intended to correct the influence of attenuation by other buildings existing between the base station and the target building T.

Specifically, as shown in FIG. 4, the quarter analysis is performed for a “large city” mesh with reference to the building data of the map data, and the target building T of the lower layer (for example, the third floor or less or 10 m or less). Is identified. The target building T may be specified by receiving an input of an address, a customer identification number (customer number, telephone number, etc.) from the user, or accepting a selection on map data. A circle with a predetermined radius is drawn on the map around the target building T. The “predetermined radius” is determined according to the scale of the target building T. As an example, the floor area of the building in the case of Sm ² The following sub-medium sized If _L 1 m, the Sm ² than the _{L 2} m.

  Next, the virtual circle is equally divided into four sectors, and all the buildings included in any sector are extracted. A building straddling a plurality of sectors is allocated to any one sector according to the occupied area or the like. Further, the position and height (the height of the antenna) of the base station BS installed within a predetermined distance from the target building T is specified with reference to the base station data of the map data.

  Based on the building data and the base station data of the buildings in each sector, the type of each sector shown in FIGS. 5A to 5D is determined. There are four types of sectors: building crossing (polar building congestion), building crossing (polar building shadow), open and along the road, based on the height of the building and the distance from the target and the direction of the base station BS. being classified. The reliability of communication characteristics and A value tends to improve in the order of over-building (densely in polar buildings), over-building (shadows of extreme buildings), along roads, and open. Set the correction value.

  Here, “beyond the building” can be further subdivided into “densely concentrated buildings” (FIG. 5A) and “polar building shadows” (FIG. 5B). “Pole building congestion” is calculated with reference to the floor area occupancy and number of buildings in the quarter. Further, the “polar building shadow” does not correspond to building congestion, but a building (aa2 in FIG. 5B) having a predetermined height or more exists on the radio wave propagation path between the target building T and the base station BS. Is the case. In addition, when it corresponds to a some attribute, it is preferable to determine with an attribute with a lower communication characteristic. For example, when the building is over the building (polar building shadow) and along the road, it is determined that the building is over (polar building shadow).

The sector attribute thus determined, the floor area of the target building T, and the height of the base station (the height of the antenna) are applied to the correction value determination table shown in FIG. A correction value (r ₁ ) is specified.

(Topology analysis)
Next, topology analysis to be performed on a mesh having an area attribute “large city” will be described. This topology analysis is an analysis method capable of reducing the amount of calculation while maintaining accuracy by replacing complicated shapes with simple shapes to derive the identity of the shapes. Topology analysis is used mainly to simplify complex shapes (structures) of cells and molecules, time-series changes, etc., and discover common features and trends. In the present embodiment, this topology analysis is applied to calculation (correction) of communication characteristics to improve analysis accuracy and increase efficiency. That is, in the topology analysis in the present embodiment, it is determined whether the building a around the target building T is a building that shields radio waves in relation to the nearest base station BS, and the target building according to the direction where the shielding building exists. The topology shape around T is determined, and a value obtained by correcting the reference estimated value of the analysis target area by the communication characteristic correction value of this topology shape is output as the communication characteristic value of the target building T.

  As shown in FIG. 7, in the topology analysis of this embodiment, according to the positional relationship between the target building T, the surrounding buildings, and the base station BS, four-way type, three-way type, L-type, parallel type, I Six shapes, a mold and an open mold, are set. A method for determining these shapes will be described with reference to FIG.

First, similar to the above-described quota analysis, a target low-rise building is specified. Next, the buildings a _{1 to} a ₄ adjacent to the target building T and the base station BS installed within a predetermined distance from the target building T are extracted. For the extracted adjacent buildings a _{1 to} a ₄ , it is determined whether the distance (within Lm) and the height (N stories or more) with the target building T shown in FIG. Here, it is assumed that all of the buildings a _{1 to} a ₄ satisfy the condition. Next, the shielding rate is calculated for the direction in which the buildings a _{1 to} a ₄ satisfying the above conditions exist among the four sides (four sides) of the target building T.

The shielding rate (%) in each direction (surface) is calculated by the following formula 1, respectively.
(The length of the contour line Ot _n of T) ((target building length of the contour line _{O an,} adjacent building facing the outline Ot _n of T) × 100) / ··· Equation 1

In the example of FIG. 8, the outlines Ot ₁ and Ot ₂ of the target building T are shielded entirely by the adjacent buildings a ₁ and a ₂ , so the shielding rate is 100%. Further, as for the outline Ot ₃ , since the adjacent buildings a ₃ and a ₄ partially overlap each other, as shown in FIG. 8B, the length l ₁ that overlaps with the outline of the adjacent building a ₃ is adjacent. The length l ₂ that overlaps the outline of the building a ₂ is added together to calculate the shielding rate of the outline Ot ₃ .

  The direction (surface) in which the shielding rate calculated by the above formula exceeds the reference value (50% or more) is specified, and it is determined which of the above six topology shapes is applicable. In the example of FIG. 8, since the downward direction of the target building T is a road and there is no adjacent building, it is determined that the topology is a three-way topology where the lower side is open as shown by a thick line in FIG.

For the topology shape determined in this way, the correction value (r ₂ ) is specified with reference to the correction value determination table of FIG. In particular correction value r _2, to correct the value corrected by the quota analysis described above again.

In general, the influence of the communication characteristics of the higher target building more open surface (direction) becomes relatively small and simulation accuracy is higher, the correction value r ₂ is greater for four-way or three-way type, Ya open type The type I is set small. Also, for topology shapes with one or more open surfaces (other than "Open type" and "4-way type"), whether the nearest base station is on the open surface side (even if it is Open or Close) Depending on the setting, different correction values are set. Furthermore, for some or all of the topology shapes, a plurality of correction values r ₂ are set or adjusted in consideration of the scale of the target building T (floor area, etc.) and the height difference between the adjacent building and the target building T. Is preferable (three-way type and four-way type in FIG. 9).

Here, with reference to FIG. 10, a method will be described in which, when there are a plurality of base stations, the irradiation partial shielding rate is calculated to determine whether the open surface side of the target building T is open or closed. The example of FIG. 10 is a three-way topology with the right side of the drawing open. In this example, the nearest direction of the base station BS1 of the target building T is shielded by neighboring buildings aa _1. On the other hand, there is no adjacent building in the direction of the other base station BS2, which is expected.
Therefore, in such an example, it is determined as “three-way type-Open”, and the correction value is specified as − (h) dB.

(Terrain analysis)
Finally, the terrain analysis to be performed on the mesh whose area attribute is “countryside” will be described.
In this terrain analysis, if there is a terrain characteristic that affects communication characteristics (electric field strength) between the target building T and the base station BS, the A value of the target building is determined in consideration of the influence of the characteristic. The correction is made locally. This terrain analysis is intended to correct the influence of the electric field strength due to the terrain cause such as the altitude of the base station or the target building T, unevenness on the route, and the like.

  In the present embodiment, as a topographic pattern (characteristic) between the target building T and the base station BS, “horizontal line of sight”, “high line of sight”, “high horizon”, “bottom ground”, and “mountain grazing” shown in FIGS. ”And“ 2nd station ”are set. These terrain patterns satisfy the conditions such as the distance / elevation difference / elevation angle between the target building T and the base station B, the distance from the target building T to the topographic obstacle, as shown in FIG. It is judged by. Then, the A value is corrected by a correction value set according to the determined terrain pattern (such as “(b) dB for“ horizontal line of sight ”). This correction value is recorded (as a communication characteristic value of the target building T. Thereby, correction processing according to the terrain pattern can be executed, and analysis accuracy can be improved.

  In determining the terrain pattern, it is preferable to sequentially determine the conditions for forming each terrain pattern in the order shown in FIGS. That is, first, the condition for establishing “horizontal line of sight” is determined, and when the condition is not satisfied, the condition for establishing “high line of sight” is determined. If none of the terrain patterns fits, correction by terrain analysis is not performed and the A value is recorded as it is as the communication characteristic value of the target building T.

(Configuration of analysis system)
Next, the configuration of the analysis system of the present embodiment that executes the above-described location analysis will be described with reference to FIG.
The analysis system 1 is configured by a computer such as a host computer, a workstation, or a PC, and is conventionally known as a control device 2, a storage device 3, an input / output interface (I / F) 4, an input / output device 5, a communication device 6, and the like. Hardware. This hardware includes, for example, a CPU (Central Processing Unit), MPU (Micro Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), It is selected from ASIC (Application Specific Integrated Circuit), NIC (Network Interface Card), WNIC (Wireless NIC), modem, optical disk, magnetic disk, flash memory, LED display, keyboard, mouse and the like.

  The storage device 3 includes a data storage area 3A for storing the above-described map data (see FIG. 1) and the like, and a program storage area 3B for storing a computer program for executing processing to be described later including a local analysis.

  The data storage area 3A includes a map data storage unit 10 that stores map data, an area attribute determination criterion storage unit 11 that stores the above-described area attribute determination criteria, and algorithms and correction values of the above-described plurality of locality analysis methods. For example, and a reference estimated value storage unit 13 for storing an estimated value (A value) for each mesh calculated by the above RF simulator or the like. Each storage unit is a certain area secured in the storage device 3.

  The analysis method storage unit 12 stores topology analysis, quota analysis, and terrain analysis types in association with area attributes, and also stores detailed data necessary for each analysis method. In the present embodiment, quota analysis and topology analysis are stored for “large city”, and topographic analysis is stored for “country”, and no local analysis method is stored for “local city”.

  First, as the information related to the topology analysis, the judgment criteria for the shielded buildings shown in FIGS. 7 to 9, the judgment criteria for a plurality of topology shapes, communication characteristic correction values, and the like are stored (topology shape storage unit). This communication characteristic correction value is preferably set / adjusted according to actual measurement values measured at a number of points.

  The topology shape is simplified as much as possible to effectively use hardware resources. Therefore, N directions (0 ≦ N ≦ N) out of the four directions of the target building, regardless of the planar shape (contour line) of the target building and the surrounding buildings. It is classified according to whether there is a shielded building in 4). Specifically, it is classified into six types shown in FIG. 7 according to the direction and the number of shielded buildings.

  For example, as shown in FIG. 8, the criteria for determining whether the building is a shielded building are the shortest distance to the target building, the height difference (difference in floor number, difference in height), and the ratio of opposing contour lines (in FIG. The shielding rate described) is set. In addition, you may include the distance between adjacent buildings, the distance between an adjacent building and a base station, an adjacent building floor area, etc. in a parameter.

  Next, the quarter analysis related information stored in the analysis method storage unit 12 includes building related indices in four sectors centered on the target building T, and a base station including the index and the target building T in the communication area. And a communication characteristic correction value set based on the direction of (sector communication characteristic correction value storage unit). Here, as described above, the building-related index includes the number of buildings in the sector, the degree of congestion, and the like. Any index is specified with reference to the building data in the map data storage unit 10 described above.

  Next, for the terrain analysis, the determination criteria for the plurality of occluded terrain objects and communication characteristic correction values for each terrain pattern shown in FIG. 11 are stored (the occluded terrain object storage unit). The occlusion landform object determination criterion is set with parameters such as the distance between the landform object and the target building, and the height difference.

(Structure of analysis program)
Next, the analysis program stored in the program storage area 3B of the storage device 3 will be described with reference to FIG.

  The analysis program includes an analysis target area identification unit 15, an area attribute determination unit 16, a target building identification unit 17, and a pole location analysis execution unit 18. Each of these means is an independent program, routine, module, or the like, and each function is exhibited by being loaded from the storage device 3 to the RAM work area and executed by the control device 2.

  First, the analysis target area specifying means 15 specifies a point (mesh) that is considered to be a dead area on the basic map data based on the claim data or the improved device data in the map data storage unit 10, and analyzes the area including this mesh. Extract as an area. The analysis target area extracted by the analysis target area specifying means 15 is the “NG area” shown in FIG. In addition to complaint data, points where the maximum population has increased rapidly due to newly built high-rise buildings or large condominiums, communication areas covered by base stations to be exchanged, etc. may be extracted as specific points or analysis target areas. . Further, the analysis target area may be extracted according to search information such as an address or a building name input by the user.

  The area attribute determination unit 16 is configured to analyze the analysis target area extracted by the analysis target area specifying unit 15 based on the building data and population / household data in the map data storage unit 10 according to the area attribute determination criterion. The area attribute of either city or country is discriminated.

  The target building specifying means 17 is similar to a well-known address search engine (software) or the like, from the basic map data according to the search conditions such as the address and building name input by the user, from the buildings existing in the analysis target area. Search the target building, accept the target building designation directly on the map data, or identify the target building from the building data according to the search conditions such as the building height, floor area, distance from the base station specified by the user .

  The location analysis execution means 18 searches the analysis method storage unit 12 for an analysis method associated with the discriminated area attribute, analyzes the communication characteristics of the target building, and analyzes the area to be analyzed based on the analysis result. A value obtained by correcting the reference estimated value is output as a communication characteristic value of the target building. If the area attribute of the analysis target area is determined to be “local city”, the reference point estimation value of the analysis target area is output as the communication characteristic value of the target building without performing the local analysis.

  This local analysis execution means 18 has a function common to the above three local analysis methods and a specific function for each analysis method.

First, as a common function, a building data extraction function (means) and a base station data identification function (means) are provided.
The building data extraction function is based on the building data stored in the map data storage unit 10, the position and height (floor, altitude, etc.) data on the map of the target building, the position and height data of the surrounding buildings of the target building, the target This is a function for extracting the planar shape (contour line) of the building and the surrounding buildings.
The base station data specifying function is a function for specifying the position on the map of one or more base stations including the target building in the communication area with reference to the base station data in the map data storage unit 10.

  Next, specific functions for each analysis method will be described.

First, with respect to quota analysis, the above-mentioned location analysis execution means 18 includes a sector division function, an intra-sector building data calculation function, and a sector communication characteristic correction value extraction function.
The sector division function is a function of equally dividing a virtual circle having a predetermined radius centered on the target building into four sectors (sectors) and distributing the building data extracted by the building data extraction function to each sector.
The intra-sector building data calculation function is a function of calculating intra-sector building data such as the number of buildings in each sector, the building density, or the building ratio based on the building data distributed to each sector by the sector division function.
The sector communication characteristic correction value extracting function refers to the sector building data and the base station position, and the sector communication characteristic correction value (see FIG. 6) stored in the analysis method storage unit 12 to communicate the sector. This is a function for extracting characteristic correction values.

Next, the topology analysis includes a shielded building determination function and a topology analysis execution function.
The shielded building determination function is a function for determining whether or not the above-mentioned shielded building determination criterion is satisfied by calculating the distance and height difference from the target building for the extracted surrounding buildings.
The topology analysis execution function determines the topology shape around the target building based on whether there is a shielded building around the target building, and estimates the reference area of the analysis target area based on the communication characteristic correction value of the determined topology shape This function corrects the value and outputs it as the communication characteristic value of the target building.

Next, the terrain analysis includes a data extraction function, a shielding terrain object determination function, a terrain pattern determination function, and a communication characteristic value output function.
The data extraction function refers to the basic map data, building data, and base station data in the map data storage unit 10, the building data of the target building, the base station data of the base station that includes the target building in the communication area, the target This is a function for extracting the terrain data around the building.
The occluded terrain object determination function is a function that calculates the value of the terrain object parameter based on the extracted data and applies it to the occluded terrain object determination criterion to determine whether the occluded terrain object exists.
The terrain pattern determination function is a function for determining the terrain pattern shown in FIG. 11 according to the terrain data of the shielding terrain object.
The communication characteristic value output function is a function that searches the storage device 3 for a communication characteristic correction value of the determined topographic pattern and outputs the communication characteristic correction value as a communication characteristic value of the target building.

(Effect of this embodiment)
As described above, according to the analysis system (analysis method and analysis program) of the present embodiment, the analysis of communication characteristics can be performed while minimizing the calculation amount by using different analysis methods according to area attributes. It is possible to improve the accuracy and specify the insensitive area. In particular, when the present invention is used in combination with other simulators (analysis software), it is possible to execute necessary correction processing after specifying areas and meshes with low accuracy of analysis results by other simulators, increasing the amount of calculation. It is possible to realize a more accurate analysis without causing the change.

  Here, in indoor (indoor) installation design such as in a building or underground mall, the accuracy of analysis is further reduced due to the influence of the outer walls and partitions of the building itself in addition to the shielding around the building. Tend to. Therefore, conventionally, the indoor RSCP value is calculated by subtracting a uniform internal penetration loss (attenuation) value from the RSCP calculated for the target mesh. And the same indoor RSCP value is used about all the indoor points in the said mesh, and it is useful for applications, such as improvement of a dead area.

  However, the analysis of indoor communication characteristics (calculation of indoor RSCP value) is only statistically processed with a small number of measured values, map data, indoor floor plan data, etc. It cannot be extracted with high accuracy.

  Even in such indoor communication characteristic analysis, by using the analysis system of the above-described embodiment, it is possible to improve the efficiency and accuracy of the analysis. In particular, as the frequency band of a wireless communication network increases in order to realize high-speed communication, radio waves are less likely to wrap around and the indoor communication environment tends to be further deteriorated. Therefore, the telecommunications carrier uses the analysis system of this embodiment to optimize the indoor communication characteristics of various types of buildings such as schools, high-rise buildings, users' homes and small stores, etc. New solutions can be obtained immediately and efficiently.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG.
This embodiment is characterized in that an indoor communication characteristic value for each building is calculated, and a mesh including a predetermined number or more of buildings whose indoor communication characteristic value does not satisfy the reference value is selected as an analysis target area. In addition, illustration and description are omitted for the constituent elements common to the first embodiment and the corresponding constituent elements.

  Specifically, as shown in FIG. 14, the analysis system 20 of this embodiment includes an indoor communication characteristic correction value storage unit 21, a building-specific communication characteristic estimation value storage unit 22, an indoor communication characteristic correction unit 23, And an analysis target area selecting unit 24.

The indoor communication characteristic correction value storage unit 21 stores an indoor communication characteristic correction value set in accordance with the size or type of a building (hereinafter collectively referred to as “building type”). This indoor communication characteristic correction value is set, for example, as follows in consideration of indoor penetration loss of radio waves based on the material, thickness, structure of the casing, height, and the like of the outer wall and the inner wall.
Large buildings with floor space of S ₁ m ² or more: -A ₁ dB
Medium-sized buildings with floor space of S ₂ m ² or more and less than S ₁ m ² : -A ₂ dB
Small buildings with floor space of S ₃ m ² or more and less than S ₂ m ² : -A ₃ dB
Detached house: -A ₄ dB regardless of floor space

  The communication characteristic estimated value storage unit 22 for each building is an estimated value of the communication characteristic of the building on the map data calculated by a method different from the analysis method stored in the analysis method storage unit 12 such as an existing RF simulator. (Hereinafter, “communication characteristic estimated value by building”) is stored in association with each building. This building-specific communication characteristic estimated value storage unit 22 may be incorporated as a layer of the map data shown in FIG.

  The indoor communication characteristic correction means 23 refers to the building data in the map data storage unit 10 to determine the building type described above for each building, and the building-specific communication of the building by the indoor communication characteristic correction value according to the building type. Correct the estimated property value. For example, if the indoor communication characteristic value by the RF simulator is -AdBm for a large building, the indoor communication characteristic correction value is -BdB, so the indoor communication characteristic value of this building is-(A + B) dBm It becomes.

  The analysis target area selecting unit 24 analyzes an area including a predetermined number or more (for example, N buildings or more) of buildings having a corrected communication characteristic estimated value for each building equal to or less than a predetermined reference value (for example, −AdBm or less). Select as. This area selection process may be performed in units of meshes or administrative divisions, or may be performed in units of any area centered on or including a specific point. For the area thus selected, the above-described area attribute determination and topology analysis are executed.

(Verification based on measured values)
Next, with reference to FIG. 15 to FIG. 20, the result of verifying the result of the local analysis by the analysis system according to the above-described embodiment based on the actual measurement value will be described.

  First, FIG. 15A is a graph comparing the coincidence rate between the analysis value (A value) obtained by the existing RF simulator and the actual measurement value in the field, and FIG. It is the graph which compared the coincidence rate of the result which correct | amended the value, and the measured value. This graph is a difference distribution graph in which the horizontal axis represents the difference in radio wave reception intensity between the measured value and the analysis value (-35dB to + 45dB), and the number of the corresponding points is plotted on the vertical axis. It does not indicate the level of (characteristic) (reception strength, ease of connection, etc.). For example, “points that are difficult to connect” and “points that are easy to connect” are mixed in the points having the same difference from the actual measurement value.

Here, the “coincidence rate” means that, of all measurement points, the difference between the communication characteristic analysis value (A value and the value after correction of the local analysis) and the actual measurement value is within ± Xdb considering the measurement error. It means the ratio of measurement points. In addition, the actual measurement value was in principle an outdoor measurement value, and when the measurement was not possible outdoors, the best value among the indoor measurement values was used as a substitute for the outdoor electric field strength. Other measured data and basic data of the A value are as follows.
Measurement date and time: December 2007 Measurement unit: 100m mesh Measurement point: 18,855 points Point where communication characteristics are judged to be good by A value: 15,887 points Of the above, points where communication characteristics were not good by actual measurement values: 200 points (Match rate 98.7%)
Points determined that communication characteristics are not good (NG) at A value: 2,968 points FIG. 15 shows the result of verification on 2,968 points determined as NG by the A value.

  As shown in FIG. 15A, in the A value before the correction process, the coincidence rate with the actually measured value was 61.91% (about 1,840 points). By performing correction processing on the A value by means of the pole analysis, the coincidence rate was improved to 72.92% (about 2,160 points).

  In addition, in FIG. 15A, the proportion of points where the A value is better than the actually measured value (left side of the graph) is 3.48% (about 100 points), and the actually measured value is better than the A value. The percentage of points (right side of the graph) is 34.62% (about 1,030 points), and the distribution peak is at + 4dB, so it can be said that the evaluation is more severe than actual. In addition, a clear boundary cannot be found between the coincidence rate range and the mismatch range. Therefore, in order to improve the coincidence rate, it is necessary to extract inconsistent points, individually verify the cause, set correction values, or modify constants / coefficients and the like.

  On the other hand, in FIG. 15B, the ratio of the points where the analysis value after the correction of the locality is better (left side of the graph) is 11.17% (about 330 points), and the actual measurement value is better than the analysis value. The percentage of major points (right side of the graph) is 15.90% (about 470 points). In addition, the distribution peak is in the vicinity of ± 3 dB, and the boundary between the coincidence rate range and the non-coincidence range is clear. Therefore, it is easy to further increase the coincidence rate by adjusting the analysis parameter, the correction value for the local analysis, and the like.

  Next, with reference to FIGS. 16 to 20, an example in which the A value before correction and the correction value after correction of the local position are compared with the actual measurement value for each of the plurality of patterns of the above-described local analysis will be described. The vertical axis and horizontal axis of the graph are the same as those in FIG.

  First, FIG. 16 shows a comparison result before and after executing a local analysis by a quarter analysis and a topology analysis for a mesh in a large city. In the A value before correction of the location shown in FIG. 16 (A), the coincidence rate was 65.65%, but it was improved to 68.70% by correcting by the quota analysis (FIG. 16 (B)). . Furthermore, the matching rate was increased to 80.36% by correcting by topology analysis.

  Next, FIG. 17 shows the result of comparing the “open type” and “I type” before and after correction in the topology analysis. In any type, the coincidence rate is improved by 10% or more. FIG. 18 shows a comparison result in another type of topology analysis. Also in this table, the coincidence rate is improved by 3% to 19% by the correction by the local analysis.

  FIG. 19 shows the comparison results before and after correction for each of the four sector types in the quota analysis. In any type, the coincidence rate is greatly improved to about 30% to 60%.

  Finally, FIG. 20 shows a comparison result before and after correction for each of the five terrain types in the terrain analysis. In any type, the coincidence rate is greatly improved to about 30% to 65%.

<Modification>
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  For example, in the above-described embodiment, the case where the communication characteristic value (A value) calculated by the existing RF simulator is corrected by the analysis system according to the present invention has been described. It can also be used as analysis software or implemented as an add-in to an existing RF simulator. When used as an independent analysis software, the above-mentioned analysis processing is executed for a plurality of targets in the analysis target area (one or a plurality of meshes), and a plurality of analysis results are statistically processed to determine the communication characteristics of the area. It can be calculated. Alternatively, communication characteristic values corresponding to a plurality of area attributes may be set in advance for each mesh regardless of the simulator, and the communication characteristic values may be corrected by the system according to the present invention. In this case, it is preferable to subdivide the area attributes and set more than the above three types.

  Further, the first embodiment and the second embodiment may be combined or selectively executed. That is, when selecting (specifying) the analysis target area, both the claim data and the building-specific communication characteristic estimation value are referred to, and the local analysis is performed on the area extracted under any condition. Alternatively, the pole analysis is executed with the highest priority for an area that satisfies both conditions, and the pole analysis is not executed or the pole analysis is not executed as necessary for an area that satisfies only one of the conditions. Further, the criteria for determining area attributes, the correction value for location analysis, the type of topology shape, the criteria for judgment, and the like may be changed depending on which condition is selected.

  Furthermore, the types of location analysis methods, the classification of area attributes, the analysis methods for each area attribute, the types and conditions of topology shapes, the types and conditions of topographic patterns for topographic analysis, and the correction values are not limited to those described above. .

  In the above-described embodiment, the pole location analysis system includes the map data storage unit. For example, the map data storage server on the network is accessed to acquire the map data when necessary. Also good. In this case, the map data providing server may be installed or rented by the user, or may use an external commercial service.

DESCRIPTION OF SYMBOLS 1,20 ... Analysis system 2 ... Control apparatus 3 ... Storage device 4 ... Input / output interface 5 ... Input / output device device 6 ... Communication device 10 ... Map data storage unit 11 ... Area attribute discrimination reference storage unit 12 ... Analysis method storage unit 13 ... reference estimated value storage unit 15 ... analysis target area specifying unit 16 ... area attribute determining unit 17 ... target building specifying unit 18 ... polar region analysis executing unit 21 ... indoor communication characteristic correction value storing unit 22 ... building-specific communication characteristic estimated value storage 23: Indoor communication characteristic correcting means 24 ... Analysis target area selecting means

Claims (19)

An area attribute discriminant storage unit for storing discriminant criteria for discriminating area attributes of a certain area on the map and two or more area attributes classified based on the thing data or statistical data of the area;
An analysis method storage unit that stores a plurality of communication point analysis methods in association with the area attribute;
An estimated value of communication characteristics (hereinafter referred to as “reference estimated value”) calculated for each fixed area on the map by a method different from the plurality of local analysis methods stored in the analysis method storage unit A reference estimated value storage unit for storing in association;
An area attribute determination means for determining an area attribute according to the area attribute determination criterion based on the thing data or statistical data of the area for the analysis target area selected from the area;
Target building identification means for accepting designation of a building subject to polar analysis (hereinafter, “target building”) from among the buildings existing in the analysis target area,
The local analysis method associated with the identified area attribute is searched from the analysis method storage unit to analyze the communication characteristics of the target building, and the reference estimation value of the analysis target area is corrected based on the analysis result. A communication characteristic analysis system comprising: a pole analysis means for outputting the measured value as a communication characteristic value of a target building. The communication characteristic analysis system according to claim 1,
The analysis method storage unit is a communication characteristic analysis system that stores topology analysis, quota analysis, or terrain analysis in association with the area attribute as a local analysis method. The communication characteristic analysis system according to claim 1,
Furthermore, it has a map data storage unit for storing map data including basic map data, population / household data, and building data,
The area attribute discrimination criterion storage unit stores discrimination criteria for discriminating two or more area attributes classified based on the population data in the area, household data, or building data or statistical data,
The communication system for analyzing characteristics, wherein the area attribute discrimination means discriminates an area attribute according to the area attribute discrimination criteria based on population / household data and building data of the map data storage unit for the analysis target area. The communication characteristic analysis system according to claim 3,
The map data storage unit stores building data and / or population / household data for each area obtained by dividing the basic map data by a predetermined range,
The area attribute discrimination standard storage unit determines the area attributes of “large city”, “local city”, and “countryside”, daytime population, nighttime population, maximum daytime and nighttime population, population density, building Communication characteristic analysis system that stores discrimination criteria based on thing data or statistical data of density, average height, or maximum height. The communication characteristic analysis system according to claim 4,
The analysis method storage unit stores the quota analysis and the topology analysis in association with the area attribute of “large city”, stores the terrain analysis in association with the area attribute of “country”, and the area attribute of “local city”. Do not store any analysis method,
When the area attribute of the analysis target area is determined to be “local city”, the above-mentioned location analysis means outputs a reference estimated value of the analysis target area as a communication characteristic value of the target building. The communication characteristic analysis system according to claim 3,
The analysis method storage unit stores a plurality of analysis methods including topology analysis as a local analysis method,
This analysis method storage unit can determine whether a building located in the vicinity of any target building (peripheral building) can be a shielded building that blocks radio waves from the base station due to the distance and / or height difference with the target building. A topology shape storage unit for storing a shielding building judgment criterion, a plurality of topological shape judgment criteria obtained by simplifying the outline of one or more shielding buildings, and a communication characteristic correction value set for each topology shape;
The location analysis means refers to the map data storage unit and the topology shape storage unit to determine the topology shape around the target building, and corrects the reference estimated value of the analysis target area by the communication characteristic correction value of the topology shape. Communication characteristic analysis system that outputs the value as the communication characteristic value of the target building. The communication characteristic analysis system according to claim 6,
The above-mentioned location analysis means is
Building data extraction means for extracting data on the position and height of the target building and position and height data of the buildings existing around the target building from the building data in the map data storage unit;
Shielded building determination means for calculating the distance from the target building and / or the height difference of the surrounding buildings extracted to determine whether the above-mentioned shielded building determination criteria are satisfied,
Determine the topology shape around the target building based on whether there is a shielded building around the target building, and correct the reference estimated value of the analysis target area based on the communication characteristic correction value of the determined topology shape. A communication characteristic analysis system comprising: topology analysis execution means for outputting the communication characteristic value of The communication characteristic analysis system according to claim 7,
The topology shape storage unit stores a plurality of topology shape determination criteria classified according to whether a shielded building exists in N directions (0 ≦ N ≦ 4) among the four directions of the target building,
The topology analysis executing means is a communication characteristic analysis system for determining a topology shape by specifying N directions where a shielded building exists by referring to position data of a building determined as a shielded building and a target building. The communication characteristic analysis system according to claim 7,
The topology shape storage unit stores, as a shielded building determination criterion, a reference value of a ratio (shielding rate) of the length of a line segment that is opposed to a contoured line of a surrounding building among contour lines in an arbitrary direction of the target building. ,
The building data extraction means extracts the planar shape (contour line) of the target building and surrounding buildings from the building data in the map data storage unit,
The topology analysis execution means calculates the shielding rate in each direction of the target building based on the extracted target building and the outline of the surrounding building, and there is a shielding building in the direction in which the shielding rate exceeds the reference value. Communication characteristic analysis system that determines topology shape based on this determination. The communication characteristic analysis system according to claim 7,
The map data storage unit stores base station data including the position of the base station,
The topology shape storage unit stores at least one communication characteristic correction value depending on whether the direction of the base station is shielded by a shielded building or not when the topology shape is open in at least one plan view. And
The topology analysis execution means refers to the base station data, determines whether the direction of the base station of the determined topology shape is shielded / opened, and extracts a communication characteristic correction value from the topology shape storage unit. Analysis system. The communication characteristic analysis system according to claim 3,
The analysis method storage unit stores a plurality of analysis methods including a quota analysis as a local analysis method,
This analysis method storage unit stores the number of buildings in a sector obtained by equally dividing a virtual circle with a predetermined radius centered on an arbitrary building, the number of buildings with respect to the sector area (density), or the number of buildings with respect to the sector area. A sector communication characteristic correction value storage unit that stores a communication characteristic correction value that is set based on the ratio of the total floor area (building ratio) and the direction of the base station that includes the arbitrary building in the communication area;
The map data storage unit stores base station data including the position of the base station,
The above-mentioned location analysis means extracts the communication characteristic correction value of the sector with reference to the map data storage unit and the sector communication characteristic correction value storage unit, and corrects the reference estimated value of the analysis target area by the sector communication characteristic correction value. Communication characteristic analysis system that outputs the value as the communication characteristic value of the target building. The communication characteristic analysis system according to claim 11,
The above-mentioned location analysis means further includes
A building data extracting means for equally dividing a virtual circle centered on the target building into four sectors and extracting building data in each sector with reference to the basic map data and building data in the map data storage unit;
In-sector building data calculation means for calculating the number of buildings in the sector, the building density or the building ratio (hereinafter collectively referred to as “building data in the sector”) based on the extracted building data;
With reference to the base station data in the map data storage unit, base station data specifying means for specifying the position of the base station including the target building in the communication area,
A communication characteristic analysis system comprising sector communication characteristic correction value extraction means for extracting the communication characteristic correction value of the sector with reference to the building data in the sector and the position of the base station and the sector communication characteristic correction value storage unit . The communication characteristic analysis system according to claim 3,
The analysis method storage unit stores a plurality of analysis methods including terrain analysis as a local analysis method,
This analysis method storage unit is a criterion for determining whether or not a terrain object existing around an arbitrary target building can be a shielding terrain object that blocks radio waves from a base station that includes the target building in the communication area. A shielding terrain object determination standard having at least one of a distance, a height difference, or an elevation angle with a building, a distance between a terrain object and a base station, a height difference, or an elevation angle (hereinafter, “terrain object parameter”); A shielding terrain object storage unit that stores communication characteristic correction values set for each of a plurality of terrain patterns classified according to terrain data such as the shape, size, and height of the shielding terrain object;
The map data storage unit stores base station data including the position of the base station,
The above-mentioned location analysis means determines the terrain pattern of the terrain object around the target building with reference to the map data storage unit and the shielding terrain object storage unit, and estimates the reference area of the analysis target area based on the communication characteristic correction value of this terrain pattern Communication characteristic analysis system that outputs the corrected value as the communication characteristic value of the target building. The communication characteristic analysis system according to claim 13,
The above-mentioned location analysis means further includes
With reference to the basic map data, building data and base station data in the map data storage unit, the building data of the target building, the base station data of the base station including the target building in the communication area, and the terrain data around the target building Data extracting means for extracting
Occluding terrain object determining means for calculating the value of the terrain object parameter based on the extracted data and applying the terrain object determining criterion to determine whether the occluding terrain object exists;
Terrain pattern determination means for determining a terrain pattern according to the terrain data of the occluded terrain object;
A communication characteristic analysis system comprising: communication characteristic value output means for retrieving a communication characteristic correction value of the determined terrain pattern from the shielding terrain object storage unit and outputting the communication characteristic correction value as a communication characteristic value of a target building . The communication characteristic analysis system according to claim 3,
The above-mentioned map data storage unit is a data for identifying a point related to the complaint (hereinafter referred to as “claim data”) regarding the complaint about the communication environment acquired from the user of the wireless communication service, or to improve the communication environment in an extreme manner Store data that identifies the location of the communication device (hereinafter “improvement device data”),
The system further includes an analysis target area specifying means for specifying a specific point on the basic map data based on the claim data or the improvement device data in the map data storage unit, and extracting an area including the specific point as an analysis target area. And
The area attribute determination means is a communication characteristic analysis system for determining an area attribute for the extracted analysis target area. The communication characteristic analysis system according to claim 3,
further,
An indoor communication characteristic correction value storage unit that stores an indoor communication characteristic correction value that is set according to the scale or type of the building (hereinafter collectively referred to as “building type”);
Associating estimated values of building communication characteristics on the map data (hereinafter referred to as “communication characteristic estimated values by building”) calculated by a method different from the analysis method stored in the analysis method storage unit with each building A building-specific communication characteristic estimated value storage section to store;
Indoor communication characteristic correction means for determining the building type of the building with reference to the building data in the map data storage unit and correcting the communication characteristic estimated value for each building by the indoor communication characteristic correction value according to the building type; ,
A system comprising: an analysis target area selecting unit that selects, as the analysis target area, an area that includes a predetermined number or more of buildings whose communication characteristic estimation values for each building after correction are a predetermined reference value or less. An area attribute discriminant storage unit for storing discriminant criteria for discriminating area attributes of a certain area on the map and two or more area attributes classified based on the thing data or statistical data of the area;
An analysis method storage unit that stores a plurality of local analysis methods of communication characteristics including topology analysis, quota analysis, or terrain analysis in association with the area attribute;
Area attribute determination means for determining the area attribute according to the area attribute determination criteria based on the object data or statistical data of the selected analysis target area;
A communication characteristic analysis system comprising: a local analysis method for searching a local analysis method associated with the determined area attribute from the analysis method storage unit and performing a local analysis on a communication characteristic of an analysis target area by the analysis method . In the storage device,
A discrimination criterion for discriminating two or more area attributes that are classified based on the thing data or statistical data of a certain area on the map,
A plurality of local analysis methods of communication characteristics, the analysis method associated with the area attribute,
An estimated value of communication characteristics calculated for each fixed area on the map (hereinafter referred to as “reference estimated value”) by a method different from this local analysis method,
Executed by the computer that stored
An area attribute determination step for determining an area attribute according to the area attribute determination criterion, based on the object data or statistical data of the area for the analysis target area selected from the area;
A target building identification step for accepting designation of a building to be subjected to polar analysis from the buildings existing in the analysis target area (hereinafter referred to as “target building”);
The local analysis method associated with the identified area attribute is searched from the analysis method storage unit to analyze the communication characteristics of the target building, and the reference estimation value of the analysis target area is corrected based on the analysis result. A location analysis step of outputting the measured value as the communication property value of the target building. In the storage device,
A discrimination criterion for discriminating two or more area attributes that are classified based on the thing data or statistical data of a certain area on the map,
A plurality of local analysis methods of communication characteristics, the analysis method associated with the area attribute,
An estimated value of communication characteristics calculated for each fixed area on the map (hereinafter referred to as “reference estimated value”) by a method different from this local analysis method,
On the computer that stores
An area attribute determination step for determining an area attribute according to the area attribute determination criterion, based on the object data or statistical data of the area for the analysis target area selected from the area;
A target building identification step for accepting designation of a building to be subjected to polar analysis from the buildings existing in the analysis target area (hereinafter referred to as “target building”);
The local analysis method associated with the identified area attribute is searched from the analysis method storage unit to analyze the communication characteristics of the target building, and the reference estimation value of the analysis target area is corrected based on the analysis result. A communication characteristic analysis program that executes a local analysis step that outputs the measured value as the communication characteristic value of the target building.

Images