Circuit design assistance device, processing method, program

Abstract

This line design assisting device uses a propagation loss calculation formula, antenna coupling loss formulas for a plurality of techniques, and a status specification parameter to calculate an estimated value of a propagation loss L. The line design assisting device performs by specifying the propagation loss calculation formula and specifying an atmospheric structure parameter M to be used in the propagation loss calculation formula, such that the estimated value of the propagation loss L approaches an actual measured value of the propagation loss, on the basis of a relationship between the actual measured value of the propagation loss, recorded on the basis of transmitted and received radio waves between a transmission side antenna and a reception side antenna, and the estimated value of the propagation loss L. The line design assisting device records the propagation loss calculation formula and the atmospheric structure parameter specified by a learning unit for each of a plurality of different combinations of transmission side antenna installation positions and reception side antenna installation positions.

Description

Technical Field

[0001] The present disclosure relates to a line design assistance device, a processing method, and the like used for assisting in the line design between antennas. Program It relates to.

Background Art

[0002] There is a technology for performing radio wave communication out of sight where direct waves do not reach between a transmission point and a reception point separated by a mountainous area or the like. In such a technology, the azimuths of the transmission antenna at the transmission point and the reception antenna at the reception point are made to face each other, and each antenna is directed toward the vicinity of the top of the mountainous area. The transmission antenna and the reception antenna used for the radio wave communication have a large aperture of the antenna and use a high-power power amplifier device. Incidentally, radio wave communication out of sight may be called OH communication (Over the horizon communication).

[0003] Related technologies are disclosed in Patent Document 1. Patent Document 1 discloses a technology for estimating radio wave propagation loss at a reception altitude where measurement is difficult in an out-of-sight environment.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the line design work that requires grasping the propagation loss and the like in the radio wave communication path between the installation position of the transmission-side antenna and the installation position of the reception-side antenna where OH communication is performed, it is necessary to assume the propagation loss, specify the calculation formula for calculating the propagation loss, and specify the parameters used in the calculation formula.

[0006] In the technology of the above-described line design work, there is a need for a technology that assists in more easily performing propagation loss in a radio communication path between the installation position of a transmission-side antenna and the installation position of a reception-side antenna, specifying a calculation formula for calculating the propagation loss, and specifying parameters used in the calculation formula.

[0007] An example of the object of this disclosure is to provide a line design assistance device, a processing method, Program to solve the above problems.

Means for Solving the Problems

[0008] According to a first aspect of the present disclosure, a line design assistance device includes: a propagation loss calculation formula for calculating a propagation loss L of the radio wave communication path using at least an atmospheric structure parameter M corresponding to an area of the radio wave communication path between the installation positions of the transmission-side antenna and the reception-side antenna, a frequency f of the radio wave transmitted and received by the transmission-side antenna and the reception-side antenna, a propagation loss Ln of the radio wave in the tropospheric radio wave scattering space in the radio wave communication path, an antenna coupling loss Lc of the radio wave communication path, a gain Gt of the transmission-side antenna, and a gain Gr of the reception-side antenna; an antenna coupling loss calculation formula of a plurality of different methods used for calculating the antenna coupling loss Lc; acquisition means for acquiring terrain data in the radio wave communication path and a situation identification parameter used for at least one of the propagation loss calculation formula or the antenna coupling loss calculation formula; estimation value calculation means for calculating an estimated value of the propagation loss L using the propagation loss calculation formula, the antenna coupling loss formulas of the plurality of methods, and the situation identification parameter; learning means for performing, based on the relationship between the actually measured value of the propagation loss recorded based on the transmission and reception of the radio wave between the transmission-side antenna and the reception-side antenna and the estimated value of the propagation loss L, specifying the propagation loss calculation formula using any one of the plurality of antenna coupling loss calculation formulas in which the estimated value of the propagation loss L approaches the actually measured value of the propagation loss, and specifying the atmospheric structure parameter M used in the propagation loss calculation formula; and recording means for recording the propagation loss calculation formula and the atmospheric structure parameter specified by the learning means for each combination of installation positions of a plurality of different transmission-side antennas and reception-side antennas.

[0009] According to a second aspect of the present disclosure, the processing method includes: a propagation loss calculation formula for calculating the propagation loss L of the radio wave communication path using at least the atmospheric structure parameter M corresponding to the area of the radio wave communication path between the installation positions of the transmission-side antenna and the reception-side antenna, the frequency f of the radio wave transmitted and received by the transmission-side antenna and the reception-side antenna, the propagation loss Ln of the radio wave in the radio wave scattering space of the troposphere in the radio wave communication path, the antenna coupling loss Lc of the radio wave communication path, the gain Gt of the transmission-side antenna, and the gain Gr of the reception-side antenna; an antenna coupling loss calculation formula of a plurality of different methods used for calculating the antenna coupling loss Lc; terrain data in the radio wave communication path; and a situation identification parameter used for at least one of the propagation loss calculation formula or the antenna coupling loss calculation formula. The estimated value of the propagation loss L is calculated using the propagation loss calculation formula, the antenna coupling loss formulas of the plurality of methods, and the situation identification parameter. Based on the relationship between the actually measured value of the propagation loss recorded based on the transmission and reception of the radio wave between the transmission-side antenna and the reception-side antenna and the estimated value of the propagation loss L, the estimated value of the propagation loss L approaches the actually measured value of the propagation loss, and the specific propagation loss calculation formula using any one of the plurality of antenna coupling loss calculation formulas is identified, and the atmospheric structure parameter M used in the propagation loss calculation formula is identified. For each combination of the installation positions of a plurality of different transmission-side antennas and the reception-side antenna, the propagation loss calculation formula and the atmospheric structure parameter identified in the machine learning are recorded.

[0010] According to a third aspect of the present disclosure, the recording medium causes a computer of a line design assistance device to calculate a propagation loss L of the radio wave communication path using at least the atmospheric structure parameter M corresponding to the area of the radio wave communication path between the installation positions of the transmission-side antenna and the reception-side antenna, the frequency f of the radio wave transmitted and received by the transmission-side antenna and the reception-side antenna, the propagation loss Ln of the radio wave in the tropospheric radio wave scattering space in the radio wave communication path, the antenna coupling loss Lc of the radio wave communication path, the gain Gt of the transmission-side antenna, and the gain Gr of the reception-side antenna; an antenna coupling loss calculation formula of a plurality of different methods used for calculating the antenna coupling loss Lc; topographic data in the radio wave communication path; and a situation identification parameter used for at least one of the propagation loss calculation formula or the antenna coupling loss calculation formula; to calculate an estimated value of the propagation loss L using the propagation loss calculation formula, the antenna coupling loss formulas of the plurality of methods, and the situation identification parameter; based on the relationship between the actually measured value of the propagation loss recorded based on the transmission and reception of the radio wave between the transmission-side antenna and the reception-side antenna and the estimated value of the propagation loss L, to identify the propagation loss calculation formula using any one of the plurality of antenna coupling loss calculation formulas in which the estimated value of the propagation loss L approaches the actually measured value of the propagation loss, and to identify the atmospheric structure parameter M used in the propagation loss calculation formula; and to store a program for causing the learning means to record the propagation loss calculation formula and the atmospheric structure parameter identified for each combination of a plurality of different installation positions of the transmission-side antenna and the reception-side antenna and the installation position of the reception-side antenna.

Effect of the Invention

[0011] According to the present disclosure, it is possible to assist in more easily assuming the propagation loss in the radio wave communication path between the installation positions of the transmission-side antenna and the reception-side antenna, identifying the calculation formula for calculating the propagation loss, and identifying the parameters used in the calculation formula.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

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Figure 7

Embodiments for Carrying Out the Invention

[0013] Hereinafter, a line design assistance device for a radio communication system according to an embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a diagram showing the configuration of a radio communication system in which the line design assistance device in this embodiment assists line design. As shown in FIG. 1, the radio communication system 100 has radio communication facilities each composed of an antenna and a radio control device at each of point A and point B separated by a mountainous area or the like or where direct waves do not reach. The first radio facility at point A is provided with an antenna 10 and a radio control device 11. The second radio facility at point B is provided with an antenna 20 and a radio control device 21. The line design assistance device 1 may be communicatively connected to the radio control device 11 and the radio control device 21.

[0014] The transmitted radio wave from either the antenna 10 or the antenna 20 diffracts around obstacles such as mountainous areas, or is reflected by obstacles, or scattered in the troposphere, and then is received by the other antenna. Thus, OH communication, which is a radio wave communication where there is no line of sight between the antenna 10 and the antenna 20, is performed. The radio control device 11 may control the amplification of the signal, output power, transmission direction of the transmitted radio wave, etc. in the antenna 10. The line design assistance device 1 is a computer device provided to assist in line design according to arbitrary installation positions of the antenna 10 and the antenna 20. Specifically, for each combination of the installation positions of a plurality of different transmitting antennas and the installation position of the receiving antenna, the line design assistance device 1 specifies a propagation loss calculation formula appropriate for calculating the propagation loss between the antennas of the combination, and specifies the atmospheric structure parameters used in the formula, and records them. By performing such processing, the line design assistance device 1 can calculate the propagation loss between antennas at arbitrary installation positions and record information for use in line design.

[0015] Figure 2 is a hardware configuration diagram of the line design assistance device according to the present embodiment. As shown in Figure 2, the line design assistance device 1 is a computer equipped with each hardware such as a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, an HDD (Hard Disk Drive) 104, a communication module 105, and a database 106. The radio control device 11 and the radio control device 12 may also have a similar hardware configuration.

[0016] Figure 3 is a functional block diagram of the line design assistance device according to the present embodiment. The line design assistance device 1 executes a processing program. As a result, the line design assistance device 1 is provided with each function of a control unit 111, an acquisition unit 112, an estimated value calculation unit 113, a learning unit 114, a recording unit 115, and a design assistance unit 116.

[0017] The acquisition unit 112 acquires various data used by the line design assistance device 1 for processing. For example, the acquisition unit 112 acquires a propagation loss calculation formula for calculating the propagation loss L of the radio wave communication path using at least the atmospheric structure parameter M, the frequency f, the propagation loss Ln, the antenna coupling loss Lc of the radio wave communication path, the gain Gt of the transmitting antenna, and the gain Gr of the receiving antenna. The atmospheric structure parameter M corresponds to the area of the radio wave communication path between the installation position of the transmitting antenna and the installation position of the receiving antenna. The frequency f is the frequency of the radio wave transmitted and received by the transmitting antenna and the receiving antenna. The propagation loss Ln is the propagation loss of the radio wave in the radio wave scattering space 5 of the troposphere in the radio wave communication path. The acquisition unit 112 acquires a plurality of antenna coupling loss calculation formulas used for calculating the antenna coupling loss Lc and corresponding to a plurality of different methods respectively. The acquisition unit 112 acquires the terrain data in the radio wave communication path and the situation specific parameter used for at least one of the propagation loss calculation formula or the antenna coupling loss calculation formula. The acquisition unit 112 may acquire other data. The situation specific parameter is a parameter used for at least one of the propagation loss calculation formula or the antenna coupling loss calculation formula. As an example, it is the atmospheric structure parameter M which is a value that changes the radio wave communication situation. In this embodiment, the terrain data and the situation specific parameter are described as different information, but the information of the terrain data may be included in the definition of the situation specific parameter.

[0018] The estimated value calculation unit 113 calculates an estimated value of the propagation loss L using the propagation loss calculation formula, a plurality of antenna coupling loss formulas corresponding to a plurality of different methods respectively, and the situation specific parameter. The learning unit 114, based on the relationship between the actually measured value of the propagation loss recorded in the past based on the transmission and reception of radio waves between the transmitting antenna and the receiving antenna and the estimated value of the propagation loss L, uses machine learning to identify the propagation loss calculation formula using any one of the plurality of antenna coupling loss calculation formulas for which the estimated value of the propagation loss L approaches the actually measured value of the propagation loss, and to identify the atmospheric structure parameter M used in the propagation loss calculation formula. The recording unit 115 records the propagation loss calculation formula specified by the learning means and the atmospheric structure parameters for each combination of the installation positions of a plurality of different transmission-side antennas and the installation position of the reception-side antenna.

[0019] As shown in FIG. 1, the line design assistance device 1 records data for assisting in line design in OH communication. In line design in OH communication, it is necessary to estimate the propagation loss L in the radio wave communication path between the installation position of the transmission-side antenna and the installation position of the reception-side antenna. Also, it is necessary to specify an appropriate formula for calculating this propagation loss L and to specify the atmospheric structure parameter M. The atmospheric structure parameter M is a value given for each climate region on the earth, and is given for each climate region defined by classifications such as Climate-1, Climate-2, Climate-3, Climate-4, Climate-5, Climate-6, Climate-7a, Climate-7b, Climate-8, etc. This value affects the refractive index of radio waves in the air. For example, Climate-1 is defined as the tropics up to 10 degrees latitude. Climate-2 is defined as the continental subtropics from 10 degrees to 20 degrees latitude. Climate-3 is defined as the maritime subtropics from 10 degrees to 20 degrees latitude. Climate-4 is defined as the desert from 20 degrees to 30 degrees latitude. Climate-5 is defined as the area adjacent to the desert from 3 degrees to 40 degrees latitude. Climate-6 is defined as the continental temperate zone from 30 degrees to 60 degrees latitude. Climate-7a is defined as the land area of the maritime temperate zone from 30 degrees to 60 degrees latitude. Climate-7b is defined as the maritime area of the maritime temperate zone from 30 degrees to 60 degrees latitude. Climate-8 is defined as the polar region above 60 degrees latitude. The above definition of the atmospheric structure parameter M is the definition of CCIR, but other standards such as ITU-R have different definitions. In the propagation loss calculation formula, by using the atmospheric structure parameter M corresponding to the climate region, it is possible to calculate the propagation loss L considering the influence of radio wave scattering according to the climate region. It is known that tropospheric scattering of radio waves occurs approximately in the upper air to 15 km, and it is necessary to calculate the propagation loss L considering this tropospheric scattering.

[0020] In line design, it is also necessary to specify an appropriate propagation loss calculation formula according to the season. The line design assistance device 1 specifies formulas for estimating the propagation loss L in the radio wave communication path between the installation positions of an arbitrary transmitting antenna and a receiving antenna, and identifies the atmospheric structure parameter M, and records them for each combination of the installation positions of the transmitting antenna and the receiving antenna.

[0021] FIG. 4 is a diagram showing an overview of the processing of the line design assistance device. The line design assistance device 1 acquires a propagation loss calculation formula, a plurality of different antenna coupling loss calculation formulas used for calculating the antenna coupling loss Lc used in the propagation loss calculation formula, terrain data, situation specific parameters, etc. (step S41). The line design assistance device 1 calculates an estimated value of the propagation loss L using the propagation loss calculation formula, the plurality of antenna coupling loss formulas, and the situation specific parameters (step S42). The line design assistance device 1 acquires the measured value of the propagation loss L recorded in the past based on the transmission and reception of the radio wave between the transmitting antenna and the receiving antenna (step S43). The line design assistance device 1, based on the relationship between the measured value of the propagation loss recorded based on the transmission and reception of the radio wave between the transmitting antenna and the receiving antenna and the estimated value of the propagation loss L, uses machine learning to specify one of the plurality of antenna coupling loss calculation formulas for the estimated value of the propagation loss L to approach the measured value of the propagation loss, and to identify the atmospheric structure parameter M used in the propagation loss calculation formula (step S44). The line design assistance device 1 may also use machine learning to identify other parameters.

[0022] The line design assistance device 1 may use machine learning to specify one of the plurality of antenna coupling loss calculation formulas for the estimated value of the propagation loss L to approach the measured value of the propagation loss, and to identify the atmospheric structure parameter M used in the propagation loss calculation formula, based on the relationship between the measured value of the propagation loss recorded based on the transmission and reception of the radio wave between the transmitting antenna and the receiving antenna and the estimated value of the propagation loss L, for each period (predetermined period) indicating a predetermined season.

[0023] The line design assistance device 1 records, for each combination of installation positions of a plurality of different transmission-side antennas and reception-side antennas for each period indicating a predetermined season, a specified propagation loss calculation formula and atmospheric structure parameters (step S45).

[0024] The propagation loss calculation formula is a propagation loss calculation formula for calculating a predetermined statistical value of the propagation loss that varies in a long cycle. Specifically, as an example, the propagation loss calculation formula is a formula for calculating the annual median value (propagation loss L(50%)) which is a predetermined statistical value of the propagation loss that varies in a long cycle. The line design assistance device 1 may perform the specification of the propagation loss calculation formula for calculating the annual median value L (propagation loss L(50%)) of the propagation loss that varies in a long cycle and the specification of the atmospheric structure parameter M used in the propagation loss calculation formula using machine learning. Or, as an example, it is a formula for calculating the propagation loss L(99.9%) when the line quality for the year, which is a predetermined statistical value of the propagation loss that varies in a long cycle, is 99.9%, and the line design assistance device 1 may perform the propagation loss calculation formula for calculating the propagation loss L(99.9%) and the specification of the atmospheric structure parameter M used in the propagation loss calculation formula using machine learning.

[0025] The following formula (1) is a propagation loss calculation formula for calculating the annual median value L (propagation loss L(50%)) of the propagation loss that varies in a long cycle.

[0026]

Equation

[0027] This formula is a formula configured using at least the atmospheric structure parameter M, the frequency f, the propagation loss L N (propagation loss Ln), the antenna coupling loss Lc of the radio communication path, the gain Gt of the transmission-side antenna, and the gain Gr of the reception-side antenna. The atmospheric structure parameter M corresponds to the area of the radio communication path between the installation positions of the transmission-side antenna and the reception-side antenna. The frequency f is the frequency of the radio wave transmitted and received by the transmission-side antenna and the reception-side antenna. The propagation loss L of the radio wave NIt is the propagation loss of radio waves in the tropospheric radio scattering space 5 in the radio communication path.

[0028] As other examples of propagation loss calculation formulas, there are known calculation formulas such as the method of Parl, the method of Masashi Hirai, the method of H. Staras, the method of Hartman-Wilkerson, the method of Booker-deBettencourt, the method of Collins, the method of Rider, the method of ITU-R, the method of Yeh, and the method of NBS. Similarly, there are differences in the ways of calculating the parameters that make up the formulas. For example, if the antenna coupling loss Lc of the radio communication path is calculated using each of the known calculation formulas such as the method of Parl, the method of Masashi Hirai, the method of H. Staras, and the method of ITU-R, different results will be obtained.

[0029] FIG. 5 is a diagram showing the processing flow of the line design assistance device. Hereinafter, the processing flow of the line design assistance device according to the present embodiment will be described. The line design assistance device 1 acquires, from the radio control device 11 and the radio control device 21, the reception sensitivity level data for each reception sensitivity level when the antenna 10 or the antenna 20 is the receiving antenna over a predetermined period such as one year. The reception sensitivity level data may be the received power value at the receiving antenna. The acquisition unit 112 of the line design assistance device 1 calculates, as the measured value, the average of the propagation loss L(50%) at each date and time over a long period such as one year based on the reception sensitivity level data and the output of the transmitting antenna, etc., and records it in the database 106. The acquisition unit 112 associates the measured value L(50%) of the propagation loss at each date and time of a predetermined period over a long period such as one year with a combination ID indicating the combination for each combination of a plurality of different transmitting antennas and receiving antennas, and records it.

[0030] The control unit 111 detects the timing of the start of processing (step S101). The start of processing may be detected by the control unit 111 when obtaining a processing start instruction by an administrator's operation input, or may be detected by the control unit 111 based on a processing start instruction automatically obtained based on some program. This processing start instruction may include a combination ID indicating a combination of the transmission-side antenna and the reception-side antenna. Further, this processing start instruction may include a line quality value indicating a probability of interruption at a predetermined unit period as information for specifying the line quality. For example, when the probability of no interruption in a unit period of 1 minute is 50%, information of 50% may be included as the line quality. When the probability of no interruption in a unit period of 1 minute is 99.9%, information of 99.9% may be included as the line quality. The control unit 111 outputs the instruction information including the combination ID and the line quality value to the acquisition unit 112.

[0031] When the line quality is 50%, the acquisition unit 112 acquires from the database 106 a propagation loss calculation formula for calculating the propagation loss L(50%) and a plurality of antenna coupling loss calculation formulas for calculating the antenna coupling loss Lc, which is one of the parameters included in the propagation loss calculation formula. The acquisition unit 112 acquires the predefined atmospheric structure parameter M corresponding to the area of the radio wave communication path between the installation position of the transmission-side antenna and the installation position of the reception-side antenna indicated by the combination ID, the frequency f of the radio wave transmitted and received by the past transmission-side antenna and reception-side antenna when the line quality is 50%, the radio wave propagation loss Ln in the radio wave scattering space 5 of the troposphere in the radio wave communication path, the gain Gt of the transmission-side antenna, and the gain Gr of the reception-side antenna. These pieces of information may be recorded in the database 106 in advance. Alternatively, these pieces of information may be values acquired by the line design assistance device 1 from the radio control device 11 or the radio control device 12. The acquisition unit 112 outputs the acquired information to the estimated value calculation unit 113.

[0032] Based on the information acquired by the acquisition unit 112, the estimated value calculation unit 113 calculates the propagation loss L(50%) in the radio wave communication path between the transmission-side antenna and the reception-side antenna indicated by the combination ID (step S102). At this time, the estimated value calculation unit 113 calculates the antenna coupling loss Lc using a plurality of different antenna coupling loss calculation formulas, and calculates the propagation loss L(50%) corresponding to each antenna coupling loss Lc.

[0033] Based on the combination ID, the learning unit 114 acquires the measured value of the propagation loss L(50%) previously recorded in the database 106 (step S103). This measured value is the average of the propagation loss L(50%) at each date and time over a long period such as one year. The learning unit 114 compares the acquired measured value of the propagation loss L(50%) with the plurality of estimated propagation losses L(50%) calculated by the estimated value calculation unit 113, and determines the propagation loss calculation formula and the antenna coupling loss calculation formula used for calculating the estimated propagation loss L(50%) that is closest to the measured value of the propagation loss L(50%) (step S104). Also, based on the plurality of relationships between the acquired measured value of the propagation loss L(50%) and the plurality of estimated propagation losses L(50%) calculated by the estimated value calculation unit 113, the learning unit 114 determines the value of the atmospheric structure parameter M for the estimated propagation loss L(50%) to approach the measured value of the propagation loss L(50%) (step S105).

[0034] The value of the atmospheric structure parameter M may be specified by comparing the estimated propagation loss L(50%) calculated by sequentially changing the atmospheric structure parameter M with the measured value L(50%), and specifying the atmospheric structure parameter M that is closest. Alternatively, the learning unit 114 may input the information acquired by the acquisition unit 112 into a specific model calculated in the past, and as a result of the output, a propagation loss calculation formula, an antenna coupling loss calculation formula, an atmospheric structure parameter M, and other parameters for calculating the propagation loss L of the radio wave communication path between the transmitting antenna and the receiving antenna indicated by the combination ID. The specific model may be, for example, a combination of reference values of situation-specific parameters such as the installation position of the transmitting antenna used in the past, the installation position of the receiving antenna, the terrain data between those antennas, and the atmospheric structure parameter M, and a specific model calculated by machine learning the relationship between the calculated values of the situation-specific parameters such as the propagation loss calculation formula, the antenna coupling loss calculation formula, and the value of the atmospheric structure parameter M used to calculate the estimated value close to the measured value of the propagation loss L.

[0035] Note that the processing start instruction may include a period indicating a predetermined season. In this case, in the above-described processing, the control unit 111 may output instruction information including information on the period indicating the season, the combination ID, and the value of the line quality to the acquisition unit 112. Also in this case, the acquisition unit 112 acquires the measured value of the propagation loss L(50%) corresponding to the period specified by the instruction information from the database 106 and outputs it to the learning unit 114. The learning unit 114 compares the measured value of the propagation loss L(50%) in a predetermined season acquired from the acquisition unit 112 with the plurality of estimated propagation losses L(50%) in that season calculated by the estimated value calculation unit 113, and determines the propagation loss calculation formula and the antenna coupling loss calculation formula used to calculate the estimated propagation loss L(50%) that is closest to the measured value of the propagation loss L(50%). Also, the learning unit 114 specifies the value of the atmospheric structure parameter M for the estimated propagation loss L(50%) to approach the measured value of the propagation loss L(50%) based on a plurality of relationships between the measured value of the propagation loss L(50%) in a predetermined season acquired from the acquisition unit 112 and the plurality of estimated propagation losses L(50%) in that season calculated by the estimated value calculation unit 113 by machine learning.

[0036] The recording unit 115 records in the database 106 by associating the identified propagation loss calculation formula, the antenna coupling loss calculation formula, the value of the atmospheric structure parameter M used in the propagation loss calculation formula, and the combination ID (step S106). When the period indicating a predetermined season is included in the processing start instruction, the recording unit 115 may further record the information on the season period in association with the identified information in the database 106.

[0037] Through the above processing, the line design assistance device 1 can identify and record the propagation loss calculation formula capable of calculating the propagation loss L(50%) corresponding to the combination of the transmission-side antenna and the reception-side antenna with high accuracy close to the measured value, the antenna coupling loss calculation formula, and the atmospheric structure parameter M used in the propagation loss calculation formula. The line design assistance device 1 performs the same processing for each combination of different transmission-side antennas and reception-side antennas, and may record by associating the propagation loss calculation formula, the antenna coupling loss calculation formula, the value of the atmospheric structure parameter M used in the propagation loss calculation formula, the combination ID, and the period indicating the season for each combination of the transmission-side antenna and the reception-side antenna. The line design assistance device 1 can assist the user in easily identifying the propagation loss calculation formula capable of calculating the propagation loss L(50%) corresponding to the combination of the transmission-side antenna and the reception-side antenna with high accuracy close to the measured value, the antenna coupling loss calculation formula, and the atmospheric structure parameter M used in the propagation loss calculation formula at the time of line design or the like for each predetermined period such as a season.

[0038] The design assistance unit 116 of the line design assistance device 1 acquires a design assistance request including information on a period indicating a combination ID and a season based on a user operation or the like on a management screen provided by the web server function or the like of the line design assistance device 1. In this case, the design assistance unit 116 acquires a propagation loss calculation formula, an antenna coupling loss calculation formula, and an atmospheric structure parameter M used in the propagation loss calculation formula, which are recorded in the database 106 in association with the combination ID and the information on the period indicating the combination ID and the season, and presents them to a terminal or the like used by the user. As a result, the user can easily grasp the propagation loss calculation formula, the antenna coupling loss calculation formula, and the atmospheric structure parameter M used in the propagation loss calculation formula for calculating an appropriate propagation loss L(50%) between the transmitting antenna and the receiving antenna indicated by the combination ID. Also, the user can easily grasp the propagation loss calculation formula, the antenna coupling loss calculation formula, and the atmospheric structure parameter M used in the propagation loss calculation formula for calculating an appropriate propagation loss L(50) according to the season between the transmitting antenna and the receiving antenna indicated by the combination ID.

[0039] In the above-described line design assistance device 1, the learning unit 114 may similarly learn situation identification parameters other than the atmospheric structure parameter M for calculating a highly accurate propagation loss L for a combination of a transmitting antenna and a receiving antenna and a period indicating a season. The atmospheric structure parameter M is also an example of the situation identification parameters.

[0040] In the above-described process, the recording unit 115 may associate and record the identified propagation loss calculation formula, the antenna coupling loss calculation formula, the value of the atmospheric structure parameter M used in the propagation loss calculation formula, and the terrain data acquired by the acquisition unit 112 with the combination ID. In this case, the user can easily grasp the propagation loss calculation formula, the antenna coupling loss calculation formula, the atmospheric structure parameter M used in the propagation loss calculation formula, etc. for calculating an appropriate propagation loss L according to the terrain data at the time of line design.

[0041] For the machine learning process by the above-described learning unit 114, any method may be used as long as it is a known technique.

[0042] In the above processing, when the line quality information included in the processing start instruction information is 99% of the line quality, the acquisition unit 112 may obtain from the database 106 a propagation loss calculation formula for calculating the propagation loss L(99%). Or when the line quality information included in the processing start instruction information is 99% of the line quality, the acquisition unit 112 obtains a propagation loss calculation formula for calculating the propagation loss L(50%), and after the estimated value calculation unit 113 calculates the propagation loss L(50%), the fading characteristic parameter fd that can be specified according to the terrain data, the radio refractive index No in the radio wave scattering space 5 of the radio wave communication path between the transmitting antenna and the receiving antenna, etc. may be used to calculate the propagation loss L(99%). For example, the propagation loss L(99%) can be obtained by adding the fading characteristic parameter fd(99%) to the propagation loss L(50%). Note that the radio refractive index No in the radio wave scattering space 5 can be calculated by a known calculation formula using the absolute temperature T(°K), atmospheric pressure P(mb), saturated water vapor pressure es(mb), relative humidity H(%), etc. in the radio wave communication path between the transmitting antenna and the receiving antenna.

[0043] FIG. 6 is a diagram showing an example of the configuration of the line design assistance device according to the present embodiment. FIG. 7 is a diagram showing a processing flow by the line design assistance device shown in FIG. 6. The line design assistance device 1 exhibits at least the functions of an acquisition unit 112, an estimated value calculation unit 113, a learning unit 114, and a recording unit 115. The acquisition unit 112 acquires a propagation loss calculation formula for calculating the propagation loss L of the radio wave communication path using at least the atmospheric structure parameter M corresponding to the area of the radio wave communication path between the installation positions of the transmission-side antenna and the reception-side antenna, the frequency f of the radio wave transmitted and received by the transmission-side antenna and the reception-side antenna, the propagation loss Ln of the radio wave in the radio wave scattering space 5 of the troposphere in the radio wave communication path, the antenna coupling loss Lc of the radio wave communication path, the gain Gt of the transmission-side antenna, and the gain Gr of the reception-side antenna, an antenna coupling loss calculation formula of a plurality of different methods used for calculating the antenna coupling loss Lc, terrain data in the radio wave communication path, and a situation identification parameter used for at least one of the propagation loss calculation formula or the antenna coupling loss calculation formula (step S201). The estimated value calculation unit 113 calculates an estimated value of the propagation loss L using the propagation loss calculation formula, the antenna coupling loss formulas of a plurality of methods, and the situation identification parameter (step S202). The learning unit 114, based on the relationship between the actually measured value of the propagation loss recorded based on the transmission and reception of the radio wave between the transmission-side antenna and the reception-side antenna and the estimated value of the propagation loss L, identifies the propagation loss calculation formula using any one of the antenna coupling loss calculation formulas of the plurality of antenna coupling loss calculation formulas for which the estimated value of the propagation loss L approaches the actually measured value of the propagation loss, identifies the atmospheric structure parameter M used in the propagation loss calculation formula, and identifies the characteristic parameter (fd) of fading using machine learning (step S203). The recording unit 115 records at least in association with each combination of the installation positions of the plurality of different transmission-side antennas and the reception-side antennas the propagation loss calculation formula and the atmospheric structure parameter identified by machine learning (step S204).

[0044] Each of the above devices has a computer system inside. And, the processes of each of the above-described processes are stored in a computer-readable recording medium in the form of a program, and the above processes are performed by the computer reading and executing this program. Here, the computer-readable recording medium refers to a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, and the like. Also, this computer program may be distributed to a computer via a communication line, and the computer that has received this distribution may execute the program.

[0045] Also, the above program may be for realizing a part of the functions described above. Further, the above program may be a so-called differential file (differential program) that can be realized in combination with a program already recorded in the computer system for the functions described above.

[0046] This application claims priority based on Japanese Patent Application No. 2021-151196 filed on September 16, 2021, and incorporates all of its disclosures herein.

Industrial Applicability

[0047] The present disclosure may be applied to a line design assistance device, a processing method, and a recording medium.

Explanation of Signs

[0048] 1 ··· Line design assistance device 10, 20 ··· Antenna 100 ··· Radio communication system 111 ··· Control unit 112 ··· Acquisition unit 113 ··· Estimated value calculation unit 114 ··· Learning unit 115 ··· Recording unit 116 ··· Design assistance unit

Claims

1. An atmospheric structure parameter M corresponding to the area of the radio wave communication path between the installation position of the transmitting antenna and the installation position of the receiving antenna, the frequency f of the radio wave transmitted and received by the transmitting antenna and the receiving antenna, the propagation loss Ln of the radio wave in the radio wave scattering space of the troposphere in the radio wave communication path, the antenna coupling loss Lc of the radio wave communication path, the gain Gt of the transmitting antenna, the gain Gr of the receiving antenna, and a propagation loss calculation formula for calculating the propagation loss L of the radio wave communication path using at least these; an antenna coupling loss calculation formula of a plurality of different methods used for calculating the antenna coupling loss Lc; terrain data in the radio wave communication path; and acquisition means for acquiring a situation specifying parameter used for at least one of the propagation loss calculation formula or the antenna coupling loss calculation formula. Estimation value calculation means for calculating an estimated value of the propagation loss L using the propagation loss calculation formula, the antenna coupling loss calculation formulas of the plurality of methods, and the situation specifying parameter. Based on the relationship between the measured value of the propagation loss recorded based on the transmission and reception of the radio wave between the transmitting antenna and the receiving antenna and the estimated value of the propagation loss L, the learning means determines that the estimated value of the propagation loss L approaches the measured value of the propagation loss, and specifies the propagation loss calculation formula using any one of the antenna coupling loss calculation formulas of the plurality of methods, and specifies the atmospheric structure parameter M used in the propagation loss calculation formula. Recording means for recording the propagation loss calculation formula and the atmospheric structure parameter M specified by the learning means for each combination of the installation positions of a plurality of different transmitting antennas and the installation positions of the receiving antennas. A line design assistance device comprising the above.

2. The learning means, for each period indicating a predetermined season, based on the relationship between the measured value of the propagation loss recorded based on the transmission and reception of the radio wave between the transmitting antenna and the receiving antenna and the estimated value of the propagation loss L, determines that the estimated value of the propagation loss L approaches the measured value of the propagation loss, and specifies the propagation loss calculation formula using any one of the antenna coupling loss calculation formulas of the plurality of methods, and specifies the atmospheric structure parameter M used in the propagation loss calculation formula. The recording means records, for each combination of installation positions of a plurality of different transmission-side antennas and installation positions of the reception-side antennas, for each period indicating the predetermined season, the propagation loss calculation formula specified by the learning means and the atmospheric structure parameter M. The line design assistance device according to claim 1.

3. The propagation loss calculation formula is a propagation loss calculation formula for calculating a predetermined statistical value of the propagation loss that varies in a long cycle. The learning means performs identification of the propagation loss calculation formula for calculating a predetermined statistical value of the propagation loss and identification of the atmospheric structure parameter M used in the propagation loss calculation formula. The recording means records, for each combination of installation positions of the plurality of different transmission-side antennas and installation positions of the reception-side antennas, the identification of the propagation loss calculation formula for calculating a predetermined statistical value of the propagation loss and the identification of the atmospheric structure parameter M used in the propagation loss calculation formula. The line design assistance device according to claim 1 or claim 2.

4. The learning means performs identification of the propagation loss calculation formula and identification of the atmospheric structure parameter M used in the propagation loss calculation formula by using machine learning. The line design assistance device according to any one of claims 1 to 3.

5. Obtain the atmospheric structure parameter M corresponding to the area of the radio wave communication path between the installation position of the transmission-side antenna and the installation position of the reception-side antenna, the frequency f of the radio wave transmitted and received by the transmission-side antenna and the reception-side antenna, the propagation loss Ln of the radio wave in the radio wave scattering space of the troposphere in the radio wave communication path, the antenna coupling loss Lc of the radio wave communication path, the gain Gt of the transmission-side antenna, the gain Gr of the reception-side antenna, a propagation loss calculation formula for calculating the propagation loss L of the radio wave communication path using at least these, an antenna coupling loss calculation formula of a plurality of different methods used for calculating the antenna coupling loss Lc, topographic data in the radio wave communication path, and a situation identification parameter used for at least one of the propagation loss calculation formula or the antenna coupling loss calculation formula. Calculate an estimated value of the propagation loss L using the propagation loss calculation formula, the antenna coupling loss calculation formulas of the plurality of methods, and the situation identification parameter. Based on the relationship between the measured value of the propagation loss recorded based on the transmission and reception of the radio wave between the transmission-side antenna and the reception-side antenna and the estimated value of the propagation loss L, specifying the propagation loss calculation formula using any one of the antenna coupling loss calculation formulas of the plurality of methods in which the estimated value of the propagation loss L approaches the measured value of the propagation loss, and specifying the atmospheric structure parameter M used in the propagation loss calculation formula, recording the specified propagation loss calculation formula and the atmospheric structure parameter M for each combination of the installation positions of the plurality of different transmission-side antennas and the installation positions of the reception-side antennas A processing method including this.

6. In the computer of the line design assistance device, the atmospheric structure parameter M corresponding to the area of the radio wave communication path between the installation position of the transmission-side antenna and the installation position of the reception-side antenna, the frequency f of the radio wave transmitted and received by the transmission-side antenna and the reception-side antenna, the propagation loss Ln of the radio wave in the radio wave scattering space of the troposphere in the radio wave communication path, the antenna coupling loss Lc of the radio wave communication path, the gain Gt of the transmission-side antenna, and the gain Gr of the reception-side antenna, at least using a propagation loss calculation formula for calculating the propagation loss L of the radio wave communication path, an antenna coupling loss calculation formula of a plurality of different methods used for calculating the antenna coupling loss Lc, the terrain data in the radio wave communication path, and a situation specifying parameter used for at least one of the propagation loss calculation formula or the antenna coupling loss calculation formula, obtaining calculating an estimated value of the propagation loss L using the propagation loss calculation formula, the antenna coupling loss calculation formula of the plurality of methods, and the situation specifying parameter Based on the relationship between the measured value of the propagation loss recorded based on the transmission and reception of the radio wave between the transmission-side antenna and the reception-side antenna and the estimated value of the propagation loss L, specifying the propagation loss calculation formula using any one of the antenna coupling loss calculation formulas of the plurality of methods in which the estimated value of the propagation loss L approaches the measured value of the propagation loss, and specifying the atmospheric structure parameter M used in the propagation loss calculation formula recording the specified propagation loss calculation formula and the atmospheric structure parameter M for each combination of the installation positions of the plurality of different transmission-side antennas and the installation positions of the reception-side antennas A program for causing it to execute.

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