JP6116362B2 - Apparatus and program for estimating the number of households affected by radio wave interference - Google Patents

Description

  The present invention relates to an apparatus for estimating the number of households affected by radio wave interference and a program for estimating the number of households subject to radio wave interference when a white space use station such as an area broadcasting station is installed.

  Currently, as a system that uses white space (frequency allocated for broadcasting purposes, but can be used for other purposes depending on geographical and technical conditions), a specific narrow area (for example, Area broadcasting for the purpose of broadcasting to museums, universities, shopping streets, etc.) has been started. In addition to area broadcasting, communication systems such as specific radio microphones, sensor networks, disaster communication systems (hereinafter referred to as “area broadcasting, etc.”) are assumed. However, in order to perform area broadcasting or the like, it is necessary to examine in advance whether or not the influence of interference due to radio waves such as area broadcasting is large.

On the other hand, there is known an electric field strength estimating apparatus that accurately estimates the received electric field strength of radio wave propagation such as broadcast waves (see, for example, Patent Document 1). In the electric field strength estimation device described in Patent Document 1, the diffraction loss calculation circuit of the reference electric field strength calculation unit calculates the diffraction loss Lf by masking the diffraction loss in the urban attenuation region, and the ridge loss calculation circuit calculates the urban attenuation. The ridge loss Lr is calculated by masking the ridge loss in the region, and the phase loss calculation circuit masks the phase loss in the urban attenuation region and calculates the phase loss Lθ. As a result, in the urban attenuation region, the double loss of the propagation loss (diffraction loss Lf, ridge loss Lr or phase loss Lθ) and the urban attenuation Γ is caused by one radio wave attenuation factor due to radio wave shielding or ground reflection. Without consideration, the electric field strength E _h2 at the reception point with the reception height h2 is estimated with high accuracy. An apparatus for accurately estimating the electric field strength has been commercialized and put into practical use (see, for example, Non-Patent Document 1).

JP 2011-223486 A

“P-MAP”, [online], NHK ITEC Co., Ltd. [searched on April 30, 2013], Internet <URL: http://www.p-map.info/>

  Using the electric field strength estimating device described in Patent Literature 1 or Non-Patent Literature 1, it is possible to estimate the electric field strength at the household representative point of the radio wave transmitted by the terrestrial digital broadcasting station. Similarly, when a white space using station that performs area broadcasting or the like is set, the electric field strength at the household representative point of the radio wave transmitted by the white space using station can be estimated. However, it was not possible to automatically estimate the number of households subject to radio interference by the White Space User Bureau.

  An object of the present invention made in view of such circumstances is to provide an apparatus and a program for estimating the number of households affected by radio interference that can automatically estimate the number of households that are subject to radio interference when a white space utilization station is installed. There is.

  In order to solve the above problems, the apparatus for estimating the number of households affected by radio wave interference according to the present invention is an apparatus for estimating the number of households affected by radio wave interference that estimates the number of households subject to radio wave interference when a white space use station is installed, A plurality of installation candidate points that are candidate points for installing a white space use station and a plurality of household representative points that receive radio waves from the white space use station are set in advance, and a white space use station is installed at the plurality of installation candidate points. The radio field intensity of each white space user station at each household representative point is stored in advance, and the installation point of the white space user station to be investigated is acquired, and the radio wave intensity of the white space user station to be investigated is obtained. Interference data indicating interference is calculated using the radio field intensity, the interference data is compared with a preset threshold value of interference data, and the household fee is calculated. Calculate the number of households that are subject to radio interference by the white space utilization stations subject to the investigation, based on the radio interference assessment unit that determines the presence or absence of radio interference for each point, and the judgment result by the radio interference assessment unit And a radio wave interference affected household number calculating section.

  Further, in the apparatus for estimating the number of households affected by radio wave interference according to the present invention, the radio wave interference determining unit determines the presence or absence of the radio wave interference for each combination of the household representative point and the terrestrial digital broadcasting station, and The number-of-households calculation unit, based on the determination result by the radio interference interference determination unit, for each terrestrial digital broadcast station, the interference of the terrestrial digital broadcast station due to the radio wave of the white space utilization station to be investigated It is characterized by calculating the number of households received.

  Furthermore, in the apparatus for estimating the number of households affected by radio wave interference according to the present invention, when the installation point of the white space utilization station to be investigated is other than the installation candidate point, the installation candidate point around the installation point is white. Using the radio field intensity when the space use station is installed, the radio field intensity estimation unit for estimating the radio field intensity of the white space use station to be investigated at the household representative point, the radio interference interference determination unit, The interference data is calculated using the radio wave intensity estimated by the radio wave intensity estimating unit.

  Furthermore, in the apparatus for estimating the number of households affected by radio wave interference according to the present invention, the interference data is an IN ratio or a DU ratio.

  Moreover, in order to solve the said subject, the program which concerns on this invention makes a computer function as said radio wave interference influence household number estimation apparatus.

  According to the present invention, it is possible to automatically estimate the number of households that receive radio interference when a white space utilization station is installed.

It is a block diagram which shows the structure of the electromagnetic wave interference influence household number estimation apparatus which concerns on the 1st Embodiment of this invention. It is a figure explaining the example of calculation of reception electric wave information. It is a flowchart which shows operation | movement of the electromagnetic wave interference influence household number estimation apparatus which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the electromagnetic wave interference influence household number estimation apparatus which concerns on the 2nd Embodiment of this invention. It is a figure explaining the estimation method of the radio wave intensity of the radio wave interference influence household number estimation apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the electromagnetic wave interference influence household number estimation apparatus which concerns on the 2nd Embodiment of this invention.

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

(First embodiment)
FIG. 1 is a block diagram showing the configuration of the apparatus for estimating the number of households affected by radio wave interference according to the first embodiment. In the example illustrated in FIG. 1, the radio wave interference affected household number estimating apparatus 1 includes a radio wave interference interference determining unit 10 and a radio wave interference affecting household number calculating unit 20. In FIG. 1, the received radio wave information storage unit 30 is provided outside the radio wave interference affected household number estimating device 1, but the radio wave interference affected household number estimating device 1 may be configured to include the received radio wave information storing unit 30.

  The received radio wave information storage unit 30 receives the received power or the received electric field strength (hereinafter referred to as “the following”) when each household representative point receives from each white space using station when a white space using station is virtually installed at a plurality of installation candidate points. The received radio wave information including “radio wave intensity” is stored. The received radio wave information may include the radio field intensity received from the terrestrial digital broadcasting station by each household representative point. Further, the channel of the terrestrial digital broadcasting station may be associated with the radio field intensity from the terrestrial digital broadcasting station. The radio wave intensity can be obtained using a product described in Non-Patent Document 1, for example.

FIG. 2 is a diagram illustrating an example of calculating received radio wave information. The household representative points are set in advance in each household area by dividing the area to be investigated into predetermined household intervals, for example, 1 km square household areas. The installation candidate points of the white space utilization station are set in advance at predetermined intervals, for example, at intervals of 1 km or 5 km. In FIG. 2, Q _{1 to} Q ₁₂ are shown as household representative points, and P _{1 to} P ₉ are shown as installation candidate points of white space utilization stations.

The reception radio wave information storage unit 30 receives each of the household representative points Q _{1 to} Q ₁₂ from the white space utilization station G ₁ when the white space utilization station G ₁ is installed at the white space utilization station installation candidate point P _1. Similarly, when the white space utilization stations G _{2 to} G ₉ are installed at the candidate installation points P _{2 to} P ₉ of the white space utilization stations, the household representative points Q _{1 to} Q ₁₂ are stored in the white space. storing signal strength received from the user station _G 2 ~G _9. The received radio wave information storage unit 30 may further store the radio wave intensity received by the household representative points Q _{1 to} Q ₁₂ from the terrestrial digital broadcasting stations T ₁ and T ₂ .

  In the radio wave interference disturbance determination unit 10, a threshold value of interference data indicating interference due to radio waves transmitted by the white space using station is set by the user. The interference data is, for example, an IN ratio (interference wave power to noise power ratio) in which the radio wave transmitted by the white space using station is an interference wave, or the digital terrestrial broadcasting station using the radio wave transmitted by the white space using station as an interfering wave. It is a DU ratio in which a radio wave to be transmitted is a desired wave. Further, installation information indicating the installation point of the white space utilization station to be investigated is set by the user in the radio wave interference disturbance determination unit 10. In the present embodiment, the installation point of the white space utilization station to be investigated is set as a preset candidate point (or a nearby point) of the white space utilization station.

  The radio wave interference disturbance determination unit 10 acquires the received radio wave information when the white space use station is installed at the installation candidate point corresponding to the installation point set by the user from the received radio wave information storage unit 30, and for each household representative point Then, interference data indicating interference due to radio waves transmitted by the white space utilization station to be investigated is calculated. Then, for each household representative point, the calculated interference data is compared with the threshold value of the interference data. If the radio wave intensity of the interference wave is greater than the threshold value, it is determined that there is radio wave interference, and the radio wave intensity of the interference wave is the threshold value. When it is below, it is determined that there is no radio wave interference. Then, the radio wave interference disturbance determination result is output to the radio wave interference affected household number calculation unit 20.

When the interference data is the IN ratio, the radio wave interference disturbance determination unit 10 determines whether or not there is radio wave interference disturbance at each household representative point Q _{1 to} Q _{12 with} respect to the white space utilization station to be investigated. For example, in FIG. 2, when the installation point of the white space utilization station as a research subject and P _1, if the interference data is IN ratio in households representative point Q ₁ to Q _12, is installed in P ₁ and calculating a ratio of an RSSI u ₁ and a predetermined noise power from white space utilization station G _1.

In addition, when the interference data is a DU ratio, the radio wave interference disturbance determination unit 10 determines whether there is radio wave interference disturbance for each combination of household representative point and digital terrestrial broadcasting station with respect to the white space utilization station to be investigated. To do. For example, in FIG. 2, when the installation point of the white space utilization station as a research subject and P _1, if the interference data is DU ratio in households representative point Q ₁ to Q _12, terrestrial digital broadcast station T the ratio of an RSSI u ₁ from the radio wave strength d ₁ and white space utilization station G ₁ from _1, and the radio wave intensity u ₁ from the radio wave intensity d ₂ and white space utilization station G ₁ from digital terrestrial broadcasting station T ₂ And the ratio is calculated. The radio wave interference disturbance determination unit 10 may determine the presence or absence of radio wave interference for each combination of household representative point and digital terrestrial broadcasting station channel.

  When the interference data is the IN ratio, the radio wave interference affected household number calculation unit 20 performs radio wave interference interference by the white space using station to be investigated based on the radio interference interference determination result by the radio wave interference interference determination unit 10. Calculate and output the number of households affected (number of affected households). The radio wave interference affected household number calculation unit 20 stores the number of households for each household area, and calculates the total number of households in the household area having the household representative points determined by the radio wave interference interference determination unit 10 as having radio interference interference. Although it is preferable to use the number of affected households, for simplicity, the number of household representative points determined to have radio interference interference by the radio interference determination unit 10 may be used as the number of affected households.

  In addition, when the interference data is a DU ratio, the radio wave interference affected household number calculation unit 20 determines the number of households based on the radio interference interference determination result by the radio interference interference determination unit 10 or the digital terrestrial broadcast station. For each of the channels, the number of affected households (for example, the number of households in which reception failure occurs) is calculated and output. Further, the radio wave interference affected household number calculation unit 20 may output information indicating which terrestrial digital broadcasting stations are affected by the white space utilization stations to be investigated.

  FIG. 3 is a block diagram showing the operation of the radio wave interference affected household number estimation apparatus 1. First, reception radio wave information for each household representative point when a white space utilization station is virtually installed at installation candidate points at predetermined intervals is calculated in advance and stored in the reception radio wave information storage unit 30 (step S101). . Further, the interference data threshold value and the installation point of the white space utilization station to be investigated are set in the radio wave interference disturbance determination unit 10 (step S102).

  Next, the received radio wave information is acquired from the received radio wave information storage unit 30 by the radio wave interference determination unit 10, and interference data indicating interference due to radio waves transmitted by the white space utilization station to be investigated, and a threshold value of the interference data, And the presence / absence of radio wave interference is determined for each household representative point (step S103).

  Finally, the number of affected households affected by radio interference is calculated by the radio wave interference affected household calculating unit 20 based on the determination result of the presence or absence of radio interference obtained in step S103. (Step S104).

  As described above, according to the apparatus 1 for estimating the number of households affected by radio wave interference according to the first embodiment, when a white space use station is installed at an installation candidate point (or its vicinity), the number of households affected by radio interference. Can be estimated. Therefore, the installation company of the white space use station can consider the installation place of the white space use station in advance from the result of the number of affected households.

(Second Embodiment)
In the apparatus 1 for estimating the number of households affected by radio wave interference according to the first embodiment, when a white space use station is installed at a location other than the installation candidate point, the white space use station is installed at the nearest installation candidate point. In this case, the accuracy of the estimation is lacking. Therefore, in the second embodiment, a radio wave interference affected household number estimation device capable of accurately estimating the number of affected households even when a white space utilization station is installed at an arbitrary point will be described.

  FIG. 4 is a block diagram showing the configuration of the apparatus for estimating the number of households affected by radio wave interference according to the second embodiment. In the example shown in FIG. 4, the radio wave interference affected household number estimating apparatus 2 includes a radio wave interference interference determining unit 10, a radio wave interference affecting household number calculating unit 20, and a radio wave intensity estimating unit 40. The radio wave interference affected household number estimating apparatus 2 of the second embodiment is different from the radio wave interference affecting household number estimating apparatus 1 of the first embodiment in that it further includes a radio wave intensity estimating unit 40. As in the first embodiment, the received radio wave information storage unit 30 is provided outside the radio wave interference affected household number estimating apparatus 1 in FIG. A configuration including the unit 30 may be adopted.

  The radio wave intensity estimation unit 40 is set by the user with installation information indicating the installation point of the white space utilization station to be investigated. Hereinafter, this installation point is referred to as a designated installation point in order to distinguish it from the installation candidate points. In the present embodiment, the designated installation point is not limited to the installation candidate point set at a predetermined interval or the vicinity thereof, and can be an arbitrary point.

  The radio wave intensity estimating unit 40 acquires the received radio wave information when the white space using station is installed at the installation candidate points existing around the designated installation point from the received radio wave information storage unit 30, and uses the received radio wave information. The radio field intensity at each household representative point due to the radio wave transmitted by the white space utilization station installed at the designated installation point is estimated and output to the radio wave interference disturbance determination unit 10.

  FIG. 5 is a diagram illustrating a radio field intensity estimation method performed by the radio field intensity estimation unit 40. The radio wave intensity u 'at the household representative point Q of the white space utilization station G' installed at an arbitrary designated installation point R is expressed by the following equation (1). Here, p is the transmission power of the white space using station, and is the same value in all the white space using stations. l ′ is the distance between the designated installation point R of the white space utilization station G ′ and the household representative point Q, and is calculated from, for example, latitude and longitude.

The propagation coefficient k ′ in the expression (1) is obtained from the propagation coefficient k _{i of} n white space utilization stations G _i virtually installed at the installation candidate points around the designated installation point R by the following expression (2) Ask for. In Figure 5, using the propagation coefficients _k 1 to k ₄ of the four white space placed virtually the installation candidate points _P 1 to P ₄ of the periphery of the specified installation point R available station _G 1 ~G _4. Here, l _i is the distance between the installation candidate point P _i and the household representative point Q, and is calculated from, for example, latitude and longitude. h _i is the distance between the installation candidate point P _i and the white space utilization station G ′, and is calculated from, for example, latitude and longitude. u _i is the radio field intensity of the white space utilization station G _{i at} the household representative point Q, and is stored as received radio wave information in the received radio wave information storage unit 30.

Therefore, the radio field intensity u ′ of the white space utilization station G ′ at the household representative point Q is expressed by the following equation (3). Here, the weight of the propagation coefficient is calculated as 1 / h, but the weight of the propagation coefficient may be set to 1 / h ² or 1 / h ^3, for example.

  Here, the antennas of all the white space using stations are regarded as the same antenna having no directivity. When considering the directivity of the antenna, the designated installation point R of the white space utilization station G ′ and the household representative point with respect to the radio field intensity of the white space utilization station G ′ at the household representative point Q obtained by equation (3) A value obtained by subtracting the attenuation due to the antenna directivity determined by the positional relationship of Q is defined as a radio wave intensity u ′.

  In the radio wave interference disturbance determination unit 10, a threshold value of interference data indicating interference due to radio waves transmitted by the white space using station is set by the user. The radio wave interference disturbance determination unit 10 acquires the radio wave intensity estimated by the radio wave intensity estimation unit 40 and calculates interference data indicating interference due to radio waves transmitted by the white space utilization station to be investigated for each household representative point. . Then, for each household representative point, the threshold value of the interference data is compared with the calculated interference data. If the radio wave intensity of the interference wave is greater than the threshold value, it is determined that there is radio wave interference, and the radio wave intensity of the interference wave is the threshold value. When it is below, it is determined that there is no radio wave interference. Then, the radio wave interference disturbance determination result is output to the radio wave interference affected household number calculation unit 20.

  Similar to the radio wave interference influence household number estimation device 1 of the first embodiment, the radio wave interference influence household number calculation unit 20 determines the radio wave interference disturbance by the radio wave interference disturbance determination unit 10 when the interference data is an IN ratio. Based on the result, for each household representative point, the number of households affected by radio wave interference (the number of affected households) by the white space utilization station to be investigated is calculated and output. When the interference data is a DU ratio, based on the radio interference interference determination result by the radio interference interference determination unit 10, for each combination of the household representative point and the terrestrial digital broadcasting station, or the household representative point and the terrestrial digital broadcasting station Calculate and output the number of affected households subject to radio wave interference by the white space usage stations to be investigated for each channel combination.

  FIG. 6 is a block diagram showing the operation of the radio wave interference affected household number estimation apparatus 2. First, reception radio wave information for each household representative point when a white space utilization station is virtually installed at installation candidate points at predetermined intervals is calculated in advance and stored in the reception radio wave information storage unit 30 (step S201). . Further, the interference data threshold value is set in the radio wave interference disturbance determination unit 10, and the designated installation point of the white space utilization station to be investigated is set in the radio wave intensity estimation unit 40 (step S202).

  Next, the radio wave intensity estimation unit 40 uses the received radio wave information when the white space use station is installed at the installation candidate points around the designated installation point, and the white space use station to be surveyed at the household representative point. The radio wave intensity is estimated (step S203).

  Next, the radio wave interference disturbance determination unit 10 acquires the radio wave intensity estimated from the radio wave intensity estimation unit 40, compares the interference data indicating interference due to the radio wave transmitted by the white space utilization station, and the threshold value of the interference data, The presence / absence of radio interference is determined for each household representative point (step S204).

  Finally, the number of affected households affected by the radio wave interference by the white space using station is calculated by the radio wave interference affected household number calculation unit 20 based on the determination result of the presence or absence of the radio wave interference disturbance obtained in step S204 (step S205). ).

  As described above, according to the apparatus 2 for estimating the number of households affected by radio wave interference according to the second embodiment, the number of households affected by radio wave interference by a white space using station when a white space using station is installed at an arbitrary point. Can be estimated automatically and in a short time with high accuracy.

  In addition, a computer can be used to function as the above-described radio wave interference influence household number estimation devices 1 and 2, and such a computer performs processing contents for realizing each function of the radio wave interference influence household number estimation devices 1 and 2. Is stored in a storage unit of the computer, and the program is read and executed by the CPU of the computer. This program can be recorded on a computer-readable recording medium.

  Each of the above embodiments has been described as a representative example, but it will be apparent to those skilled in the art that many changes and substitutions can be made within the spirit and scope of the invention. Therefore, the present invention should not be construed as being limited by the above-described embodiments, and various modifications and changes can be made without departing from the scope of the claims. For example, a plurality of constituent blocks described in the embodiments can be combined into one, or one constituent block can be divided.

  As described above, the present invention is useful for any application for estimating the number of households affected by radio wave interference when a white space using station such as an area broadcasting station is installed.

1, 2 Radio wave interference influence household number estimation device 10 Radio wave interference disturbance judgment unit 20 Radio wave interference influence household number calculation unit 30 Received radio wave information storage unit 40 Radio wave intensity estimation unit

Claims (5)

A device for estimating the number of households affected by radio wave interference that estimates the number of households subject to radio wave interference when a white space usage station is installed,
A plurality of installation candidate points that are candidate points for installing a white space use station and a plurality of household representative points that receive radio waves from the white space use station are set in advance, and a white space use station is installed at the plurality of installation candidate points. Radio field strength of each white space use station at each household representative point when
The installation point of the white space utilization station to be investigated is acquired, interference data indicating interference due to radio waves of the white space utilization station to be investigated is calculated using the radio field intensity, and the interference data is set in advance. A radio interference interference determination unit that compares the threshold value of the interference data and determines the presence or absence of radio interference interference for each household representative point,
Based on the determination result by the radio wave interference disturbance determination unit, a radio wave interference influence household number calculation unit that calculates the number of households that are subject to radio interference by the white space utilization station to be investigated,
An apparatus for estimating the number of households affected by radio wave interference, comprising: The radio interference disturbance determination unit determines the presence or absence of the radio interference interference for each combination of the household representative point and the terrestrial digital broadcasting station,
The number of households affected by radio wave interference is calculated for each digital terrestrial broadcast station based on the determination result by the radio wave interference disturbance determination unit, and the radio wave of the white space utilization station to be investigated is the radio wave of the terrestrial digital broadcast station. The apparatus for estimating the number of households affected by radio wave interference according to claim 1, wherein the number of households subject to interference interference by the radio wave is calculated. When the installation point of the white space utilization station to be investigated is other than the installation candidate point, using the radio field intensity when the white space utilization station is installed at the installation candidate point around the installation point, A radio field intensity estimating unit that estimates the radio field intensity of the white space utilization station to be surveyed at the household representative point,
The apparatus for estimating the number of households affected by radio wave interference according to claim 1 or 2, wherein the radio wave interference disturbance determination unit calculates the interference data using the radio wave intensity estimated by the radio wave intensity estimation unit.   The apparatus for estimating the number of households affected by radio wave interference according to any one of claims 1 to 3, wherein the interference data is an IN ratio or a DU ratio.   The program for functioning a computer as a radio wave interference influence household number estimation apparatus as described in any one of Claim 1 to 4.

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