JP7144186B2 - Station location candidate selection system - Google Patents

Description

The present invention relates to a station location candidate selection system that selects candidates for installation locations of wireless base stations, and not only candidates for installation locations of wireless base stations to satisfy service areas, but also antenna heights (building heights) required therefor. The present invention relates to a station location candidate selection system capable of efficiently performing station placement work by presenting information necessary for installation work such as the height of a steel tower) and installation work.

Communication systems that use radio waves, such as mobile phone systems and MCA (multi-channel access systems), divide the service area into finely divided cells, each of which is called a cellular system. Base stations are arranged on a cell-by-cell basis.

A cellular system is a system that repeatedly uses a limited number of allocated frequencies so that many subscribers can use it at the same time. proper arrangement is required.

However, in actual situations, it may not be possible to install a base station in a theoretical location for various reasons such as topography, environment, consent of local residents, and intention of land/building owners. Therefore, in general, the number of base stations required is approximately 30% greater than the theoretically calculated number of base stations.

Conventionally, when deciding where to install a base station, it was assumed that the base station was installed near the center of the service area, and simulations were performed to see how far the radio waves would reach. Antenna height, antenna orientation (direction, tilt), transmission power, etc., are adjusted according to the altitude and topography of the installation site, and designed to satisfy the required service area.

After that, they went to the site and negotiated land leases, etc., but they were not allowed to install the base station in the desired installation location for the reasons described above. The general procedure is to repeat the negotiations on site.

Patent Document 1 discloses a system for exchanging information between a master unit (transceiver) installed in a specific area and child units (transceivers) installed in buildings included in the specific area. Disclosed is a station placement design support map creation method that allows stations to be planned using objective indicators.

According to Patent Document 1, a station location design support map creation method includes a step of preparing map data, a step of meshing a map included in the map data to form a plurality of sections, and dividing the plurality of sections into sections. a step of extracting buildings included in an area of a predetermined size centered on the center; a step of assigning an evaluation value corresponding to the number of extracted buildings to each of a plurality of sections; and displaying on a map. Based on the evaluation value displayed on the attribute map, it is determined where to install the base unit.

Patent Literature 2 discloses a base station installation information management system capable of grasping history information for each building on a map by selecting an area in which a base station of a wireless communication network is desired to be installed.

According to Patent Document 2, map information provided by a provider, building information including building addresses, heights, conditions, etc., and base station information including conditions as a base station of a wireless communication network are input. and a cloud with a group of servers that store a database in which is registered. When the user selects an area in which the user wishes to install a base station while the user's communication terminal is connected to the cloud server via the network, the server displays a map of the selected area on the display of the communication terminal. At the same time, an icon corresponding to the status including history information is displayed at the building position on the map.

Japanese Patent Application Laid-Open No. 2001-005851 JP 2017-130875 A

When actually determining the installation location of a radio base station, the radio wave propagation simulation results show that the station location that satisfies the service area is not limited to one location, and there may be multiple candidates for the station location. These multiple candidates for station locations are selected for various reasons, such as topography, environment, consent of local residents, and intentions of land/building owners. height) and the period required for installation work.

In the station location design support map creation method disclosed in Patent Document 1, a map is meshed to form a plurality of divisions, and buildings included in areas of a predetermined size centered on the divisions are extracted from the plurality of divisions. Then, by assigning an evaluation value corresponding to the number of extracted buildings to each of the plurality of sections, the installation location of the parent device is determined. However, the topography, altitude, etc. of the location where the base unit is installed are not taken into consideration, and radio wave propagation from the base unit is not simulated, so it cannot be said that the optimum location for the base unit has been selected. .

In the base station installation information management system disclosed in Patent Document 2, map information, building information such as building address, height, conditions, etc. are input, conditions as a base station of a wireless communication network, distance from an antenna position, and so on. Only the visible area and the like are managed, and in the first place, there are few candidates for the installation location of the wireless base station, and it is limited.

Therefore, in order to solve the above problems, the present invention divides a station placement candidate area that includes the service area into grids, and determines the service area based on the radio wave propagation simulation results when the station is placed at the center of each grid. The coverage rate is quantified, and map information, land use classification, required antenna height (building height and steel tower height), and existing wireless base stations are selected from among multiple station location candidates that satisfy the predetermined coverage rate. By referring to information such as whether or not there is interference with the surrounding area, the number of neighboring residents who need their consent, and information on land and building owners, we will determine the most appropriate location for the installation of wireless base stations in terms of cost, period, and other conditions. It is an object of the present invention to provide a station location candidate selection system capable of selecting candidates.

In order to achieve the above object, the present invention provides a station location candidate selection system for selecting candidates for installation locations of wireless base stations, wherein a service area in which radio wave propagation from the wireless base station is desired can be specified. an input unit, a simulation condition input unit capable of designating simulation conditions for radio wave propagation, a map-related data management unit for managing map data including at least elevation data of a candidate station location area including the service area, and the elevation A radio wave propagation simulation unit for calculating the radio wave propagation coverage ratio in the service area using data, a storage unit for storing the coverage ratio calculated by the radio wave propagation simulation unit, and a display capable of designating display conditions of the coverage ratio. a condition input unit; a display information generation unit that generates display information of the coverage rate based on the display conditions; divides the station placement candidate area into grids based on the size of the grid and the height of the radio base station specified in , and calculates the coverage ratio when the radio base station is installed at the center of each grid. and the display unit is capable of displaying the display information including the coverage ratio for each grid, which is generated by the display information generation unit based on the display method specified by the display condition input unit. characterized by

Further, the altitude data of the present invention is characterized in that it is surface layer height data to which heights of objects existing on the ground surface are also added.

Further, the coverage rate of the present invention is calculated by calculating the received power of radio waves at the center position of all the grids related to the service area when the wireless base station is installed at the center position of each grid. The received power of the radio wave specified by the simulation condition input unit is obtained from the ratio of the number of grids that satisfies the received power of the radio wave specified in the simulation condition input unit and the number of all grids in the service area.

Further, the map-related data management unit of the present invention further manages station placement restriction information in the station placement candidate area, and the station placement restriction information includes land use classification information, radio wave interference location information, station placement negotiation NG, and station placement restriction information. information, building number information and/or landowner information.

In addition, the display information generation unit of the present invention is configured to display the outer edge of the service area, the grids, the coverage ratio, the height of the antenna of the radio base station, and the like based on the display conditions specified by the display condition input unit. generating display information in which character information and/or colors are superimposed on a map, or display information consisting only of character information, based on the station location restriction information and/or information related to the map-related data management unit; characterized by

Further, the display condition input unit and the display unit of the present invention are arranged in a terminal device, the terminal device has a positioning unit capable of acquiring position information of the terminal device, and the display information generation unit includes the It is characterized in that position information from a positioning unit is reflected in the display information.

Further, in the station position candidate selection system of the present invention, after the display unit displays the coverage rate for each of the grids, the radio base station is selected in any specific desired station position candidate. The radio wave propagation simulation unit recalculates the radio wave propagation coverage rate for the service area when the antenna is installed at an antenna height of .

Further, the radio wave propagation simulation unit of the present invention can calculate the radio wave propagation coverage rate of the service area when a plurality of the radio base stations are installed in the station placement candidate area, and the calculation is performed individually. is installed at the center position of each grid under the simulation conditions specified by the simulation condition input unit, the range of radio wave propagation in the service area is calculated, and the service of each of the radio base stations is calculated. The radio wave propagation coverage of the service area is calculated by combining radio wave propagation ranges with respect to the area when a plurality of the radio base stations are installed.

Further, the radio wave propagation simulation unit of the present invention calculates the coverage rate with a plurality of patterns for the height of the wireless base station, and the display condition input unit replaces the coverage rate with a predetermined coverage rate. The display condition of the height of the radio base station required to satisfy can be specified together with the predetermined coverage rate, and the display information generation unit substitutes the cover rate for the height of the radio base station can be generated based on the display conditions, and the display unit replaces the display information including the coverage with the predetermined display information for each grid generated by the display information generation unit It is characterized in that it is possible to display the display information including the height of the radio base station required to satisfy the coverage rate.

According to the station location candidate selection system of the present invention, the station location candidate area including the periphery of the service area is divided into grids, and a radio wave propagation simulation is performed in advance when the station is placed at the center of each grid. As a result, not only near the center of the service area, but also in the station placement candidate area including the periphery of the service area, while quantitatively confirming the coverage rate of radio wave propagation to the service area, multiple station placement locations can be selected.

Further, according to the present invention, when performing radio wave propagation simulation in advance, it is possible to specify a plurality of antenna heights in the simulation condition input unit and perform radio wave propagation simulation using each antenna height. Considering the antenna height required for each candidate station location, selecting a station location that satisfies the coverage rate of radio wave propagation to the service area with the minimum antenna height reduces costs related to station placement. can be suppressed.

In addition, according to the present invention, when selecting a plurality of candidates for station locations from the results of radio wave propagation simulation performed in advance, not only the coverage rate of radio wave propagation to the service area but also management by the map-related data management unit Since it is also possible to check the station placement restriction information that is set, it is possible to eliminate the risk of radio wave interference and candidate sites where station placement negotiations are not possible.

Further, according to the present invention, when selecting a plurality of station location candidates from the results of radio wave propagation simulation performed in advance, the number of buildings around the candidate station location managed by the map-related data management unit Since it is also possible to check the information of the landowner, etc., it is possible to reduce the period and cost related to station placement by selecting a station placement location that requires less station placement negotiations.

Further, according to the present invention, when selecting a plurality of candidates for a station location from the results of a radio wave propagation simulation performed in advance, plane map data, aerial photographs, etc., as the latest map data acquired from an external map database, etc. It is possible to visualize and display the service area, station candidate area, and coverage ratio, which is the result of radio wave propagation simulation, in characters, figures, numbers, colors, etc., making it easy to find station candidates. can be grasped.

Further, according to the present invention, when selecting a plurality of station position candidates from the results of a radio wave propagation simulation performed in advance, information necessary for selecting the station position candidates is obtained based on predetermined display conditions. Since it can be generated, for example, it is possible to generate a list of station position candidates in the vicinity of the geometric center of the service area and with higher coverage, as display information, and display it on the display unit. can be easily selected.

In addition, according to the present invention, since it is possible to select a plurality of candidates for station placement locations that take various conditions into account using the results of radio wave propagation simulations performed in advance, the number of repetitions of on-site surveys and station placement negotiations can be reduced. can be reduced, and the cost and construction period related to station installation work can be greatly shortened.

Further, according to the present invention, the terminal device can be connected to the simulation device via the communication network, and the radio wave propagation simulation results stored in the storage unit can be confirmed at the site. Candidates can be easily confirmed.

Further, according to the present invention, since the terminal device has a positioning unit, it is possible to confirm the position of the terminal device by superimposing the radio wave propagation simulation results stored in the storage unit on site with the map information. Therefore, it is possible to easily confirm candidates for station locations on site.

In addition, according to the present invention, it is possible to calculate the radio wave propagation coverage ratio when a plurality of wireless base stations are installed in one service area, and the combination when wireless base stations are installed in two locations Therefore, even if one radio base station cannot sufficiently cover the service area, two candidates for the station location can be selected.

1 is a block diagram showing the configuration of a station location candidate selection system; FIG. FIG. 10 is a diagram showing a processing flow of radio wave propagation simulation in the station location candidate selection system; FIG. 3 is a diagram showing service areas and station placement candidate areas on a map; FIG. 4 is a diagram showing an example of altitude data at the center position of each grid displayed on the map; FIG. 5 is a diagram showing a processing flow for generating display information to be displayed on the display unit of the terminal device; FIG. 10 is a diagram showing an example of coverage of radio wave propagation to a service area when a station is placed at the center position of each grid displayed on the map. FIG. 10 is a diagram showing a processing flow for confirming locations where stations cannot be placed based on station placement restriction information; FIG. 10 is a diagram showing an example of displaying radio wave propagation coverage in a service area and places where stations cannot be placed; FIG. 10 is a diagram showing another example of displaying radio wave propagation coverage in a service area and locations where stations cannot be placed; FIG. 10 is a diagram showing an example of a list format in which station location candidates are displayed in descending order of priority. Fig. 3 shows a detailed map within the selected grid; FIG. 2 is a diagram showing the concept of the coverage rate of the service area by 2 stations, (a) shows the range of radio wave propagation of station A, (b) shows the range of radio wave propagation of station B, and (c) shows It shows the range of radio wave propagation when both A and B stations are combined. FIG. 10 is a diagram showing candidates for each station location in a list format in descending order of coverage by dual stationization;

A mode for implementing a station location candidate selection system according to the present invention will be described below with reference to the drawings. The present invention relates to a station location candidate selection system for selecting candidates for installation locations of radio base stations. (the height of the building and the height of the steel tower) and the information necessary for the installation work are presented, and the station placement work can be performed efficiently.

[Structure of station location candidate selection system]
First, the station location candidate selection system will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of a station location candidate selection system.

As shown in FIG. 1, in the station location candidate selection system 1, a simulation device 3 and a terminal device 30 are communicably connected to each other via a communication network 15. It is possible to import the latest map-related data from the map database 17 .

The simulation device 3 performs a radio wave propagation simulation from a radio base station for a service area, and stores and outputs the results. It consists of a section 10 and a map-related data management section 12 .

The service area input unit 5 in the station location candidate selection system 1 is for inputting numerical information of latitude and longitude of a service area in which radio wave propagation from a radio base station is desired. Latitude and longitude information of each vertex is input.

The simulation condition input unit 7 is for inputting the conditions used by the radio wave propagation simulation unit 9. The size of the grid when dividing the station position candidate area including the periphery of the service area into grids (1 side length, etc.), size of station candidate area (e.g., distance from outer edge of service area), height of antenna to be used, transmission power, antenna gain, antenna beam pattern (omni, directivity, etc.), cable loss ( feeder loss), etc.

Based on the information input from the service area input unit 5 and the simulation condition input unit 7, the radio wave propagation simulation unit 9 divides the station position candidate area including the periphery of the service area into grids, When the radio base station is installed at the specified antenna height, the received power of radio waves at the center position of all grids related to the service area is calculated.

In the calculation of the received power of radio waves, the altitude data is used to determine whether there is an obstacle within a straight distance. That is, radio wave propagation is simulated from the visibility (LOS: Line of Site), and from the results, the ratio of the number of grids with which a predetermined radio wave reception power is obtained out of all grids related to the service area is calculated as radio wave propagation. is stored in the storage unit 10 as the coverage ratio of .

The altitude data is preferably the height data of the ground surface, or surface height data obtained by adding the height of an object existing on the ground surface. In other words, the elevation data is not only the height of the ground surface, but also surface height data that includes the height of buildings such as buildings, the height of forests, etc. (DSM: Digital Surface Model).

Also, even if it is determined that radio waves cannot be received due to the lack of visibility from the altitude data, radio waves may still be received due to reflection and diffraction of radio waves. (Omni, directivity, etc.), cable loss (feeder loss), etc. may be used to simulate radio wave propagation in more detail to calculate whether predetermined radio wave reception can be obtained.

The storage unit 10 stores the result of the radio wave propagation simulation unit 9 together with an ID or the like that uniquely identifies the service area and simulation conditions.

The map-related data management unit 12 manages data related to service areas in which radio wave propagation from wireless base stations is desired and station location candidate areas, together with latitude and longitude. Further, the data related to the service area where radio wave propagation from the radio base station is desired and the station position candidate area also include map data related to the service area and station position candidate area. data is at least included.

The map-related data management unit 12 has a station placement restriction information database 13 that stores station placement restriction information. The station placement restriction information database 13 stores station placement restriction information such as radio wave interference point information affecting the service area, station placement negotiation NG information in the station placement candidate area, information on the number of units in the building, and landowner information. These are also managed together with latitude and longitude.

The radio wave interference location information stores information necessary for calculating radio wave interference, such as installation locations and antenna heights of wireless base stations in other nearby service areas.

Negotiation NG information for station placement is information on landowners who had difficulty in station placement negotiations in the past, and information on wireless base stations (antennas, etc.) of other carriers that have already been installed even after station placement negotiations. It stores information on installation locations where negotiations on station placement should be avoided, such as interference.

The building number information and land owner information store the building number information and land owner information related to the corresponding station location candidate area. In some cases, the consent of nearby residents is required for the installation of a wireless base station, and the number of residents who need consent varies depending on the height of the antenna of the wireless base station (for example, the length of the antenna is twice as long as the height of the installed antenna). Consent of residents included in a circle with a radius of is required, etc.). Reducing the number of residents who need their consent reduces the cost and time required for negotiating station installation, enabling efficient station installation work.

In order to transmit and receive data to and from exchanges and base stations, radio base stations require fiber optic cables to be installed. may become. If it is not possible to connect an optical fiber cable, data is sent and received to and from the switching center or base station via wireless communication (wireless entrance) via other wireless base stations in the vicinity, but other wireless base stations in the vicinity It is also possible to use station placement restriction information as to whether or not it is possible to see the

The line of sight between the radio base stations can also be calculated using the radio wave propagation simulation unit 9 . At that time, in order to consider not only the altitude data but also the reflection and diffraction of radio waves, we also use transmission output, antenna gain, antenna beam pattern (omni, directivity, etc.), cable loss (feeder loss), etc. , it is preferable to simulate radio wave propagation in more detail.

The map-related data management unit 12 can access the external map database 17 via the communication network 15 using the latitude and longitude data.

As the external map database 17, a map information DB of the Geospatial Information Authority of Japan or a private map information DB can be used. It is possible to acquire map data such as classification information data. It is conceivable that the building number information and landowner information are also obtained from the external map database 17 . It is also assumed that these map data are stored in the map-related data management unit 12 in advance.

Land use classification information data manages the use classification of each land (place) (rice field, other agricultural land, forest, barren land, building land, main transportation land, lake, river, etc.) corresponding to latitude and longitude. It is used to confirm the feasibility of the installation work of the wireless base station.

The altitude data is height data of the ground surface based on latitude and longitude, and may be surface layer height data to which the height of objects existing on the ground surface is also added. The map-related data management unit 12 can store in advance height data of structures such as buildings and forests corresponding to latitude and longitude.

Further, when the external map database 17 provides the surface height data, it is possible to import the surface height data as altitude data using the latitude and longitude data.

As shown in FIG. 1, the terminal device 30 comprises a display section 32, a display condition input section 34, a display information generation section 36, and a positioning section .

The station location candidate selection system 1 has at least one or more terminal devices 30 , and the terminal devices 30 are preferably portable, such as a tablet terminal connectable to the communication network 15 . However, a device such as a desktop PC, which is unsuitable for portability, is not excluded.

The display unit 32 in the terminal device 30 displays display information generated by the display information generation unit 36 based on the display conditions input by the display condition input unit 34, and displays characters, numbers, images, moving images, and the like. It consists of a possible liquid crystal monitor, etc.

The display condition input unit 34 specifies display conditions for display information to be displayed on the display unit 32 . Display conditions include specification of the antenna height used to display the coverage rate of radio wave propagation to the service area, specification (switching) of the map data to be displayed such as plane map data and aerial photograph data, and specification of the map to the service area. The radio wave propagation simulation results stored in the storage unit 10, such as the display of the antenna height required for each station location (grid) candidate in order to specify the radio wave propagation coverage rate and the map-related Any display information that can be generated from data that can be obtained from the data management unit 12 and the external map database 17 may be designated as display conditions.

The display condition input unit 34 of the terminal device 30 receives display conditions according to a menu displayed on the display unit 32, for example.

Based on the display conditions specified by the display condition input unit 34, the display information generation unit 36 generates the outer edge of the service area, each grid, the coverage ratio, the height of the antenna of the wireless base station, the station location restriction information and/or the map. Based on the information related to the related data management unit, display information in which character information and/or colors are superimposed on the map, or display information consisting only of character information is generated.

That is, the display information generation unit 36 uses the data managed by the map-related data management unit 12, the data of the external map database 17, and the radio wave propagation simulation results stored in the storage unit 10 according to the display conditions. to generate display information (display image) to be displayed on the display unit 32 .

The display information uses latitude and longitude to superimpose the service area on plane map data and aerial photograph data as map data with polygons. , to display the coverage within each grid. That is, it is possible to display the coverage rate in each grid by superimposing character information and/or colors on the map. Further, display information may be generated by displaying the results of radio wave propagation simulation in the form of a list using only character information without using planar map data, aerial photograph data, or the like.

The positioning unit 42 measures the current position of the terminal device 30 using a built-in GPS (Global Positioning System). The current position can be displayed. In addition, the display information generation unit 36 generates display information according to the position information from the positioning unit 42, and moves the map displayed on the display unit 32, etc. can be reflected in display information displayed on the display unit 32 .

[Processing of Candidate Locations for Installation of Wireless Base Stations]
Next, processing of radio wave propagation simulation in the station location candidate selection system will be described. FIG. 2 is a diagram showing a processing flow of radio wave propagation simulation in the station location candidate selection system.

First, numerical information on the latitude and longitude of a service area in which radio wave propagation from a radio base station is desired is input from the service area input unit 5 of the simulation device 3 (step S1).

Numerical information on the latitude and longitude of the service area is information on the latitude and longitude of each vertex of a polygon representing the service area. Read in 9.

The conditions to be used in the radio wave propagation simulation section 9 are designated from the simulation condition input section 7 (step S2). The conditions to be used include, for example, the size of the grid when dividing the station position candidate area into grids, the height of the antenna, the size of the surrounding area, and the like. For setting the antenna height, it is possible to select a plurality of heights such as "15m, 20m, 40m".

The radio wave propagation simulation unit 9 uses the altitude data (which may be surface height data as described above) to determine whether there is an obstacle within a straight line or not, that is, whether or not there is a line of sight, to simulate radio wave propagation. (LOS: Line of Site), reflection and diffraction of radio waves, it may be possible to receive radio waves even if there is no line of sight. omni, directivity, etc.), cable loss (feeder loss), etc. can be specified from the simulation condition input unit 7. FIG.

For conditions that are required only when performing a detailed radio wave propagation simulation, it is preferable to normally use specified values so that specification from the simulation condition input unit 7 can be omitted.

Based on the data input from the service area input unit 5, a polygon is formed by connecting the positions indicated by the latitude and longitude with straight lines, and the outer edge of the service area is determined (step S3).

Next, the radio wave propagation simulation unit 9 selects a station location candidate area that includes a peripheral area with a widened width (distance) specified by the simulation condition input unit 7 from the outer edge of the service area to the outside as a candidate for the installation location of the wireless base station. is set (step S4). Note that the station placement candidate area is an area that is a candidate for the installation location of a wireless base station capable of sufficiently propagating radio waves to the service area even outside the service area.

FIG. 3 is a diagram showing a service area 57 where radio wave propagation from a radio base station is desired and a station location candidate area 55 on a map 51. The geometric center of the service area 57 is indicated by symbol "C".

Next, the radio wave propagation simulation unit 9 divides the station position candidate area 55 including the service area 57 into grids 70 (shown in FIG. 3) having the size designated by the simulation condition input unit 7 (step S5). For example, when the size of the grid 70 is set to 50 m (meters) in the east-west and north-south directions from the simulation condition input unit 7, if the east-west distance of the station placement candidate area is 1500 m and the north-south distance is 1800 m, 30 Thirty-six grids 70 are formed in the north-south direction. In FIG. 3, as an example for explanation, the distance between east and west is 500 m, the distance between north and south is 500 m, and 10 grids 70 are formed in the east and west and 10 grids 70 in the north and south.

Next, the altitude data of the center position of each grid 70 (which may be surface layer height data as described above) is read (step S6). The radio wave propagation simulation unit 9 outputs the latitude and longitude data of the center position of each grid 70 to the map-related data management unit 12, and the map-related data management unit 12 uses the latitude and longitude data to store data in the external map database 17. Then, the altitude data at the latitude and longitude are read out and output to the radio wave propagation simulation unit 9 . FIG. 4 is a diagram showing an example of altitude data at the center position of each grid 70. As shown in FIG.

Next, the antenna height above sea level is calculated from the altitude data at the center position of each grid 70 and the antenna height specified by the simulation condition input unit 7 (step S7).

Next, when the radio wave propagation simulation unit 9 is placed at the center position of each grid 70, using the antenna height from the sea level at the center position of each grid 70, all the grids 70 in the service area 57 Radio wave propagation is simulated to calculate the received power of radio waves (step S8).

Here, radio wave propagation is calculated using the antenna height above sea level at the center position of the grid 70 where the station is assumed to be placed, and the altitude data at the center position of all the grids 70 in the service area 57. (LOS), but in more detail, it may be possible to receive radio waves even if there is no line of sight due to radio wave reflection, diffraction, etc. Therefore, the antenna transmission output, gain, beam pattern (omni, directivity etc.), cable loss (feeder loss), etc. may be used for calculation.

Next, a coverage ratio is calculated as a ratio of the number of grids 70 satisfying a predetermined reception power of radio waves in the service area 57 and the number of all grids 70 in the service area 57 (step S9). For example, in FIG. 3, a total of 41 grids 70 are formed in the service area 57 . Assuming that the station is placed at the center position of one grid 70 in the station placement candidate area 55, when the received power of the radio wave at the center position of a total of 41 grids 70 related to the service area 57 is calculated, When the number of grids 70 satisfying the received power is 36, the coverage rate in the grids 70 assumed to be located is approximately 88%.

Further, when a plurality of antenna heights are designated in the simulation condition input unit 7 (for example, 15 m, 20 m, 40 m, etc.), the antenna heights are sequentially changed, the process returns to step S7, and the radio wave propagation simulation unit 9 performs the simulation. and calculate the coverage ratio for that antenna height.

The coverage ratio calculated by the radio wave propagation simulation unit 9 is stored in the storage unit 10 (step S10).

In this way, the station location candidate selection system 1 divides the station location candidate area 55 including the service area 57 into grids, and the wireless base station is designated at the center of each grid 70 by the simulation condition input unit 7. The reception power of radio waves when the antenna is installed at a high height is calculated, and the coverage rate for the service area 57 of each grid 70 is stored in the storage unit 10 . Thereby, the radio wave propagation coverage rate of the service area 57 can be calculated.

[Confirmation processing of simulation results by terminal device]
Next, confirmation of the simulation result of radio wave propagation stored in the storage unit 10 of the simulation device 3 by the terminal device 30 will be described.

FIG. 5 is a diagram showing a processing flow for generating display information to be displayed on the display section of the terminal device 30. As shown in FIG. As shown in FIG. 5, an ID or the like that uniquely identifies the service area 57 and the simulation conditions is specified in the display condition input unit 34 of the terminal device 30, and the results of the radio wave propagation simulation stored in the storage unit 10 are displayed. Conditions for displaying a certain coverage rate, for example, antenna height, map data to be used, display form, for example, superimposed display on the map, or display of priority of station position where the coverage rate is high (from character information list display), etc. (step S20).

Next, the display information generation unit 36 transmits input data such as display conditions such as an ID that uniquely identifies the service area 57 and the simulation conditions input from the display condition input unit 34 to the simulation device 3 via the communication network 15 . (step S21).

Next, based on the data received from the display condition input unit 34, the storage unit 10 of the simulation device 3 outputs the corresponding service area 57 and the radio wave propagation simulation result for the service area 57 to the terminal device 30 (step S22).

When displaying map data or the like under the display conditions received from the display condition input unit 34, the map-related data management unit 12 of the simulation device 3 accesses the external map database 17 using the latitude and longitude of the service area 57. , to obtain the necessary map-related data (step S23).

The display information generation unit 37 of the terminal device 30 acquires the coverage ratio and the map data, which are the radio wave propagation simulation results, from the storage unit 10 and the map-related data management unit 12, forms the grid 70 on the acquired map data, Display information is generated by superimposing the numerical data of the coverage rate in each grid 70 (step S24).

The display information generation unit 36 outputs the generated display information to the display unit 32, and the display unit 32 displays the acquired display information (step S25).

If map data is not displayed under the display conditions specified by the display condition input unit 34, for example, a radio wave propagation simulation result from the storage unit 10 with a high coverage ratio is given priority, and a station with a high coverage ratio is selected. Along with the information of the grid 70 corresponding to the location, it is also possible to generate display information in the form of a list or the like consisting of character information and display it on the display unit 32 .

FIG. 6 is a diagram showing an example of coverage of radio wave propagation to the service area 57 when the station is placed at the center position of each grid 70 displayed on the map. The coverage rate of radio wave propagation in the service area 57 is displayed in each grid 70 as shown in FIG. As shown in FIG. 6, the coverage rate within the grid is displayed on the display unit 32 of the terminal device 30 using character information including numbers and colors.

[Confirmation processing of locations where wireless base stations cannot be installed]
Next, processing for confirming locations where wireless base stations cannot be installed based on station placement restriction information held by the map-related data management unit 12 will be described with reference to FIG. FIG. 7 is a diagram showing a processing flow for confirming locations where stations cannot be placed based on station placement restriction information.

First, the display information generator 36 of the terminal device 30 reads land use division information data corresponding to each grid 70 of the station location candidate area 55 from the external map database 17 (step S40).

Next, the terminal device 30 superimposes, on the grid 70, the places where the radio base station cannot be installed in the station placement candidate area 55 with numbers, colors, etc., and displays them on the display unit 32 based on the read land use division information data. (Step S41). Thereby, it is possible to determine whether or not the position of the grid 70 can be set.

Next, the display information generation unit 36 of the terminal device 30 outputs latitude and longitude data regarding the station location candidate area 55 to the map-related data management unit 12, and the map-related data management unit 12 uses the latitude and longitude data to The radio wave interference point information in the station placement candidate area 55 is read (step S42).

Next, the terminal device 30 superimposes figures, numbers, colors, etc. on the grid 70 and displays the places where the radio base station cannot be installed on the display unit 32 based on the read radio wave interference point information (step S43). Thereby, it is possible to determine whether or not the position of the grid 70 can be set. For example, it is confirmed whether or not the distance between the existing radio base station in the adjacent service area and the selected station location candidate is greater than or equal to a predetermined distance.

Next, the display information generation unit 36 of the terminal device 30 outputs latitude and longitude data regarding the station position candidate area 55 , and the map-related data management unit 12 uses the latitude and longitude data to determine the position of the station position candidate area 55 . The station negotiation NG information is read (step S44).

Next, the terminal device 30 superimposes and displays on the grid the locations related to buildings and land where station negotiation is impossible based on the read station negotiation NG information (step S45). As a result, it is possible to determine whether or not the building or land included in the grid 70, which is a candidate station location, is negotiable for station location.

Next, the display information generation unit 36 of the terminal device 30 outputs latitude and longitude data related to the station position candidate area 55, and the map-related data management unit 12 uses the latitude and longitude data to determine the location of buildings in the station position candidate area 55. number of households and land owner information (step S46).

By reading out the building unit number information and land owner information, the number of dwelling units, land owners, and the like to be negotiated for station placement are specified in the grid 70, which is a candidate for the station location, when a more specific station location is designated. can grasp. For example, when installing an antenna, it is necessary to obtain consent from the landowner within a predetermined distance from the antenna. It is also possible to make judgments for efficient station placement work, such as the number of landowners to be negotiated because they match.

In this way, locations where radio base stations cannot be installed are confirmed based on the station location restriction information, and candidate locations for station locations are selected (step S47). Since it is possible to display and confirm the consent of neighboring residents and the intentions of land and building owners, it is possible to select a station location with a higher possibility. In addition, it is possible to obtain information for the procedure necessary for station placement.

[Display example of candidate station location]
FIG. 8 is a diagram showing an example in which radio wave propagation coverage ratios and locations where stations cannot be placed in the service area 57 are superimposed on a map. As shown in FIG. 8, locations where wireless base stations cannot be installed based on station placement restriction information are indicated by "0 (numerical value)" or white (color). In this way, it is possible to visualize and display not only character information but also numbers and colors, and it is possible to easily grasp a place where a station cannot be placed.

FIG. 9 is a diagram showing another example of displaying the radio wave propagation coverage ratio and locations where stations cannot be placed in the service area 57. In FIG. As shown in FIG. 9, it is also possible to pinpoint the position of the station placement restriction information by using a station location restriction mark 75 . Further, for example, by selecting the mark 75 by a touch operation on the touch panel or a mouse operation, it is possible to display the details of the station placement restriction information.

FIG. 10 is a diagram showing an example of displaying candidates for station locations in the form of a list consisting of character information in descending order of priority. For example, in a grid within a predetermined distance from the geometric center of the service area 57 ("C" shown in FIG. 3), and in descending order of coverage of radio wave propagation, display information A candidate list of station locations is created as , and displayed on the display unit 32 .

That is, the display information generation unit 36 calculates the distance from the geometric center of the service area 57 (“C” in FIG. 3), the inside and outside of the service area 57, the coverage rate, the antenna height, and the height of buildings around the candidate site for station placement. Any combination of various information such as the number of households, the number of landowners, the availability of optical fiber cables to wireless base stations, the presence or absence of line-of-sight to existing wireless base stations in adjacent service areas, etc., is weighted as desired. The priority of each grid 70 can be evaluated. The display information generating unit 36 can generate display information indicating a list of station location candidates in descending order of priority using character strings.

In addition, in FIG. 10, river areas, railways, and forests, which cannot be placed as land use classifications, are listed on the list for reference information, but it is naturally possible to display a list excluding these. In this way, the position, latitude and longitude, and land use classification of the grid 70 are displayed in order from the grid 70 having the highest priority. It may be possible to check the map.

Similarly, this high priority grid 70 can also be displayed on the map. That is, the display information generation unit 36 can display the numerical values of the priorities superimposed on the map 51, such as 1 to 5 in the rounded squares in FIG.

Further, in the present invention, the radio wave propagation simulation unit 9 calculates the coverage rate with a plurality of patterns for the height of the radio base station, thereby calculating the height of the radio base station required to satisfy a predetermined coverage rate. It can be displayed in place of the coverage rate.

That is, the radio wave propagation simulation unit 9 calculates coverage ratios for the height of the wireless base station using a plurality of patterns, and stores the calculation results in the storage unit 10 . The display condition input unit 34 of the terminal device 30 can specify the display condition of the height of the wireless base station required to satisfy a predetermined coverage rate, instead of the coverage rate, together with the predetermined coverage rate. The display information generation unit 36 can generate display information on the height of the wireless base station based on the display conditions specified by the display condition input unit 34 instead of the coverage rate.

Therefore, the display unit 32 displays the height of the wireless base station required to satisfy the predetermined coverage ratio for each grid generated by the display information generation unit 36 instead of the display information including the coverage ratio. Information can be displayed, for example, instead of the display of FIGS. 8 and 9, the height of the required radio base stations can be displayed in numbers instead of the coverage rate in each grid 70. FIG. In this case, the radio wave propagation simulation unit 9 performs radio wave propagation simulations for a plurality of patterns of the height of the radio base station, and the simulation results are stored in the storage unit 10 in advance.

As for the height of the radio base station required to satisfy a predetermined coverage rate in each grid, the coverage rate is shown numerically in each grid 70 as shown in FIGS. It is also possible to indicate the required height of the radio base station by the color of the applied color. Conversely, it is also possible to indicate the height of the required radio base stations numerically in each grid 70 and to indicate the coverage rate in color. In addition, it is also possible to output the display of the required height of the radio base station in the form of a list consisting of character information.

As a result, since it is possible to easily grasp the height of the radio base station required to satisfy a predetermined coverage rate, it is possible to efficiently select candidates for station locations without incurring costs.

The display information generator 36 not only displays the altitude of the antenna as the height of the radio base station, but also uses surface height data obtained by adding the height of objects such as buildings existing on the ground surface to the altitude data. In that case, it is also possible to consider the height of the building, etc., and display how much steel tower is required from the height of the building (for example, the roof of the building). Also, the height of the wireless base station from the ground surface may be displayed. Also, if there is elevation data and building height data, it is possible to display how many steel towers are required by performing calculations by combining them.

[Optimization of station location candidates]
The station location candidate selection system of the present invention can select a more optimal station location within the grid 70 selected as a station location candidate. Optimization of station position candidates will be described below with reference to FIG. FIG. 11 shows a detailed map within the selected grid 70 .

Since the calculation of the coverage by the radio wave propagation simulation unit 9 is performed at the center position of the grid 70 such as 50 m × 50 m or 100 m × 100 m, the surroundings of the center position of the grid 70 can be obtained from maps such as planar map data and panoramic photo data. When it is confirmed by the data that the center position 71 of the grid 70 is the field 80 on the map 51, for example, when the station cannot be placed, the local station 50 of the wireless base station can be used as the base station 50. It is easy to bring in construction vehicles and heavy machinery. The sides of the road 81 (places indicated by black circles) are specifically selected as candidates for station locations.

Then, the radio wave propagation simulation unit 9 can recalculate the radio wave propagation coverage ratio in the service area 57 when the radio base station is installed at a desired antenna height at the more specifically selected station location 50. be. That is, the terminal device 30 outputs the latitude and longitude of the station location selected more specifically and the designated antenna height to the simulation device 3, and receives the result recalculated by the radio wave propagation simulation unit 9. , the coverage rate of the service area 57 in the more specifically selected station location 50 can be displayed.

In this way, based on the land use classification information data, radio wave interference point information, and station placement restriction information, which is station placement negotiation NG information, it is possible to superimpose and display places where wireless base stations cannot be installed, so it is possible to place stations. It is possible to select a station placement location that is highly reliable and reduces the cost and time required for station placement.

Note that the order of processing shown in FIG. 7 is an example, and is not limited to this. Further, the process of confirming the location where the wireless base station cannot be installed may be performed by displaying a process menu on the display unit 32 of the terminal device 30 and individually selecting items to be processed.

As described above, the present invention performs radio wave propagation simulation in the station placement candidate area 55 including not only the center of the service area 57 but also the periphery of the service area 57 to calculate the coverage rate, and satisfies the service area 57. It is a station position candidate selection system capable of obtaining a station position such as a station position. In addition, the simulation results include the required antenna height (building height and steel tower height), the radio wave propagation coverage rate in the service area 57 obtained when the station is placed at that location, and the areas where radio waves are difficult to reach. Display information is generated and output to the display unit 32 so that the location can be found.

This reduces the number of repetitions of station placement negotiations on site, and likewise reduces the number of repetitions of radio wave propagation simulation. In addition, even in the service area 57 where an appropriate station placement location has not been found until now, a station placement location with a coverage rate that satisfies the service area can be found in the surrounding area outside the service area 57. Expansion is possible.

[Dual station placement]
In the above, the wireless base station is installed in one place. If the base station 57 has a V shape or the like, it may be blocked by a mountain or the like, and one radio base station may not be able to satisfy the service area 57. In such a case, two radio base stations are used. It is possible to calculate the coverage rate for the service area 57 when

That is, the radio wave propagation simulation unit 9 simulates radio wave propagation when two wireless base stations are installed in the station placement candidate area 55 including the periphery of the service area 57, and calculates the coverage rate of the service area 57. It is possible to The radio wave propagation range for the service area 57 is calculated when each wireless base station is installed at the center position of each grid 70 in the station placement candidate area 55 at the antenna height specified by the simulation condition input unit 7, and each wireless base station By combining the radio wave propagation ranges for the service area 57 of the stations, it is possible to calculate the coverage ratio for the service area 57 when two wireless base stations are installed.

A radio wave propagation simulation in the case of installing two radio base stations will be described below with reference to FIGS. 12 and 13. FIG. FIG. 12 is a diagram showing the concept of the coverage rate of the service area when two wireless base stations are installed. (a) shows the radio wave propagation range of station A, and (b) shows the radio wave propagation of station B. , and (c) shows the range of radio wave propagation when both stations A and B are combined.

Even when two radio base stations are installed, radio wave propagation simulation is performed when the station is placed at the center position of each grid 70 in the station placement candidate area 55 in the same manner as when one radio base station is installed. . FIG. 12 shows that the grid with 0 or 1 is the service area 57, and the result of the radio wave propagation simulation when the wireless base station is installed in the station placement candidate area 55 is the center position of the grid related to the service area 57. Calculate the received power of the radio wave, set the grid where the calculated received power of the radio wave satisfies the received power of the radio wave specified in the simulation condition input section to 0, and specify the calculated received power of the radio wave in the simulation condition input section. A grid that does not satisfy the received power of the received radio wave is set to 1.

FIG. 12(a) shows the radio wave propagation range for the service area 57 when station A is installed as the first radio base station in the center of the grid indicated by the thick frame. It shows the radio wave propagation range for the service area 57 when station B is installed as the second radio base station in the center of the grid indicated by the frame. 57 is a combination of radio wave propagation ranges.

For example, if the grid size is set every 50m (meters) in the east-west and north-south directions, the east-west distance of the station candidate area is 1500m, and the north-south distance is 1800m. grid is formed. The radio wave propagation range for the service area 57 when a wireless base station is installed at the center of each grid in a total of 1080 grids is calculated. In FIG. 12, as an example for explanation, the number of grids in the north-south and east-west directions is reduced, and the distance in the east-west direction is 700 m, the distance in the north-south direction is 750 m, and the grids 70 are 14 in the east-west direction and 15 in the north-south direction. Shown for. As shown in FIGS. 12A and 12B, when the number of stations is 1 (Station A alone or B station alone), the calculated reception power of the radio wave is There are many grids (marked with 1) that do not meet the received power of . Therefore, the number of stations placed in the station placement candidate area is set to 2 (both A and B stations).

In this case, there are about 582,660 combinations of 2 stations in a total of 1080 grids, 30 in the east-west and 36 in the north-south. . Also, for example, as shown in FIG. 12, there are about 21,945 combinations of 2 stations in 210 grids, 14 in the east-west direction and 15 in the north-south direction. to select.

FIG. 13 is a diagram showing candidates for each station location in the order of high coverage ratio by dual station display in a list format consisting of character information. The coverage rate by one station and the distance between two stations are shown together in the list.

As shown in FIG. 13, for example, a first base station (A station) is installed at Y1 position 21 and X1 position 20 on the grid, and a second base station (A station) is installed at Y2 position 27 and X2 position 28 on the grid. Station B), the coverage rate will be about 93%, and the coverage rate with one base station will be about 71% for Station A and about 76% for Station B, so two base stations will be installed. Thereby, the coverage can be greatly improved.

In this way, for example, when securing a road in a mountainous area as the service area 57, if the service area 57 is V-shaped or the like along the road, if a station can be placed near the corner of the V-shape, There is a possibility that one station can cover the area, but if it is not possible to place a station at that location, or if the coverage rate is too low with one station, two stations will cover the area.

In this case, based on the calculation results of the radio wave propagation simulation to the service area 57 to be covered by one station, the antenna height is the lowest among the two combinations extracted from all the calculation results, and the probability of area coverage is can derive a combination of two stations with a high . Even in this case, even if the probability is high, if two stations are located at a predetermined short distance, there is a possibility of radio wave interference, so it is possible to exclude them from selection targets.

Also, in order to eliminate radio wave interference to the maximum extent possible, it is possible to sort the list with priority given to those with few overlaps (overlapping grids) in the radio wave propagation ranges with respect to the service areas 57 of the two stations.

As described above, according to the station location candidate selection system of the present invention, the station location candidate area 55 including the periphery of the service area 57 is divided into grids, and a station is placed at the center of each grid 70. By conducting a radio wave propagation simulation in advance, not only near the center of the service area 57, but also in the station placement candidate area 55 including the periphery of the service area 57, the coverage rate of radio wave propagation to the service area 57 can be quantified. It is possible to select a plurality of station location candidates while checking numerically.

Further, according to the present invention, when performing radio wave propagation simulation in advance, it is possible to specify a plurality of antenna heights in the simulation condition input unit 7 and perform radio wave propagation simulation using each antenna height. By selecting a station position that satisfies the radio wave propagation coverage rate to the service area 57 with the minimum antenna height while considering the antenna height required for each of a plurality of station position candidates, You can keep costs down.

Further, according to the present invention, when selecting a plurality of station location candidates from the results of the radio wave propagation simulation performed in advance, not only the coverage rate of radio wave propagation to the service area 57 but also the map-related data management unit 12 Since it is also possible to check the station placement restriction information managed by , it is possible to exclude the risk of radio wave interference and candidate sites where station placement negotiations are not possible.

Further, according to the present invention, when selecting a plurality of station location candidates from the results of the radio wave propagation simulation performed in advance, the map-related data management unit 12 manages the buildings around the station location candidates. Since it is also possible to check the number of houses and landowner information, it is possible to reduce the period and cost related to station placement by selecting a station location that requires less negotiation.

Further, according to the present invention, when selecting a plurality of candidates for the station location from the results of the radio wave propagation simulation performed in advance, the , the service area 57, the station candidate area 55, and the coverage ratio, which is the result of the radio wave propagation simulation, can be visualized and displayed using characters, figures, numbers, colors, etc., making it easy to grasp candidate station locations. can do.

Further, according to the present invention, when selecting a plurality of station position candidates from the results of a radio wave propagation simulation performed in advance, information necessary for selecting the station position candidates is obtained based on predetermined display conditions. Since it can be generated, for example, a list (character information) of station location candidates can be generated as display information and displayed on the display unit with priority given to those near the geometric center of the service area 57 and having a high coverage rate. Therefore, it is possible to easily select a station location candidate.

In addition, according to the present invention, since it is possible to select a plurality of candidates for station placement locations that take various conditions into account using the results of radio wave propagation simulations performed in advance, the number of repetitions of on-site surveys and station placement negotiations can be reduced. can be reduced, and the cost and construction period related to station installation work can be greatly shortened.

Further, according to the present invention, the terminal device 30 can be connected to the simulation device via the communication network 15, and the radio wave propagation simulation results stored in the storage unit 10 can be checked at the site. Candidates for station locations can be easily confirmed.

Further, according to the present invention, since the terminal device 30 has a positioning unit, the position of the terminal device 30 is also confirmed by superimposing the radio wave propagation simulation results stored in the storage unit 30 on site with the map information. Therefore, it is possible to easily confirm candidates for station locations on site.

Further, according to the present invention, it is possible to calculate the radio wave propagation coverage ratio in the case where a plurality of radio base stations are installed in one service area 57. Since the optimum solution of the combination can be obtained, even if the service area 57 cannot be fully covered with one radio base station, two candidates for the station location can be selected.

Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. , is included in the scope and gist of the invention, and is included in the scope of the invention described in the claims and its equivalents.

Also, the functional blocks shown in the functional block diagram of FIG. 1 show the functional configuration of the station location candidate selection system according to the present invention, and do not limit the specific implementation form. In other words, hardware corresponding to the functional blocks in the figure need not be implemented, and it is of course possible to adopt a configuration in which one processor executes a program to realize the functions of a plurality of functional units. Moreover, part of the functions realized by software in the embodiments may be realized by hardware, and further, part of the functions realized by hardware may be realized by software.

1 station location candidate selection system 3 simulation device 5 service area input unit 7 simulation condition input unit 9 radio wave propagation simulation unit 10 storage unit 12 map-related data management unit 13 station location restriction information database 15 communication network 17 external map database 30 mobile terminal Device 32 Display unit 34 Display condition input unit 36 Display information generation unit 42 Positioning unit 50 Station position 51 Map 55 Station position candidate area 57 Service area 59 Surrounding area 61 Calculation area 70 Grid 71 Center position 75 Mark (station position restriction point)
80 field 81 road

Claims (9)

A station location candidate selection system for selecting candidates for installation locations of wireless base stations,
a service area input unit capable of designating a service area in which radio wave propagation from the radio base station is desired;
a simulation condition input unit capable of designating simulation conditions for radio wave propagation;
a map-related data management unit that manages map data including at least elevation data of a station location candidate area that includes the service area;
a radio wave propagation simulation unit that calculates a radio wave propagation coverage rate in the service area using the altitude data;
a storage unit that stores the coverage ratio calculated by the radio wave propagation simulation unit;
a display condition input unit capable of designating display conditions for the coverage ratio;
a display information generating unit that generates display information of the coverage rate based on the display condition;
A display unit that displays the display information,
The radio wave propagation simulation unit divides the station location candidate area into grids based on the size of the grid and the height of the radio base station designated by the simulation condition input unit, and places the radio wave at the center position of each grid. calculating the coverage rate when installing a base station;
The display unit is capable of displaying the display information including the coverage rate for each grid, which is generated by the display information generation unit based on the display method specified by the display condition input unit. A station location candidate selection system. 2. The station location candidate selection system according to claim 1, wherein the altitude data is surface height data to which heights of objects existing on the ground surface are also added. When the radio base station is installed at the center position of each grid, the coverage rate is calculated by calculating the reception power of radio waves at the center position of all the grids related to the service area, and receiving the calculated radio waves. 2. The station position according to claim 1, wherein power is obtained from a ratio of the number of grids satisfying the reception power of radio waves specified in the simulation condition input unit and the number of all grids in the service area. Location candidate selection system. The map-related data management unit also manages station placement restriction information in the station placement candidate area,
2. The station location candidate selection according to claim 1, wherein the station location restriction information comprises land use classification information, radio wave interference location information, station location negotiation NG information, building number information and/or landowner information. system. Based on the display conditions specified by the display condition input unit, the display information generation unit generates the outer edge of the service area, each grid, the coverage ratio, the height of the antenna of the radio base station, the position of the station, and the like. Based on the restriction information and/or information related to the map-related data management unit, display information is generated in which text information and/or colors are superimposed on the map, or display information consisting only of text information is generated. Item 5. The station location candidate selection system according to item 4. The display condition input unit and the display unit are arranged in a terminal device,
2. The terminal device has a positioning unit capable of acquiring position information of the terminal device, and the display information generating unit reflects the position information from the positioning unit in the display information. The station location candidate selection system described in . In the station location candidate selection system, after the display unit displays the coverage rate for each grid, the radio base station is installed at a desired antenna height in any desired specific station location candidate. 2. The station location candidate selection system according to claim 1, wherein the radio wave propagation coverage ratio for the service area in the case where the radio wave propagation simulation is performed is recalculated in the radio wave propagation simulation unit. The radio wave propagation simulation unit is capable of calculating a radio wave propagation coverage rate of the service area when a plurality of the radio base stations are installed in the station placement candidate area,
The calculation includes calculating the range of radio wave propagation in the service area when each of the radio base stations is installed at the center of each grid under the simulation conditions specified by the simulation condition input unit, 2. The method according to claim 1, wherein radio wave propagation coverage of said service area is calculated by combining ranges of radio wave propagation with respect to said service area of a base station when a plurality of said radio base stations are installed. Station location candidate selection system. The radio wave propagation simulation unit calculates the coverage rate with a plurality of patterns for the height of the wireless base station,
The display condition input unit is capable of specifying a display condition of the height of the radio base station required to satisfy a predetermined coverage rate in place of the coverage rate together with the predetermined coverage rate,
The display information generation unit is capable of generating display information of the height of the wireless base station based on the display condition, instead of the coverage ratio,
The display unit substitutes the display information including the coverage ratio with the height of the radio base station required to satisfy the predetermined coverage ratio for each grid generated by the display information generation unit. 2. The station location candidate selection system according to claim 1, wherein said display information including .

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