Information processing device, information processing system, data generation method, and program

Abstract

To provide an information processing device capable of creating a received power distribution around a shield or an obstacle.SOLUTION: An information processing device 10 according to the present disclosure includes: a detecting unit 11 for detecting the presence of an obstacle using a measured value of received power measured by a measuring device that has received radio waves; an estimation unit 12 for estimating a change in the received power in a predetermined area after the detection of the presence of the obstacle and before the detection of the obstacle; and an updating unit 13 for updating a first received power distribution in the prescribed area stored in a storage device and generated based on the measurement value before the detection of the presence of the obstacle by using the change in the received power.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an information processing device, an information processing system, a data generation method, and a program. [Background technology]

[0002] Wireless communication using radio waves is utilized in various fields, and the received power when receiving radio waves is one of the important factors in evaluating the quality of wireless communication. For example, when evaluating the quality of wireless communication in a certain area, a received power distribution may be created. The received power distribution refers to the distribution of received power in a certain area, and visualizing the distribution of received power makes it easier to estimate the quality of wireless communication spatially.

[0003] When calculating the received power distribution in a certain area based on actual observation data, the received power distribution is calculated by observing the received power at each position within the area using a sensor that receives radio waves and outputs received power. Since the observations are made in a discrete space, spatial interpolation methods such as the IDW method and Kriging algorithm are commonly used to calculate the received power distribution in a continuous space or a more detailed discrete space. These methods take advantage of the property of received power that the received power values ​​are close at nearby positions or short distances.

[0004] Furthermore, when it is not possible to simultaneously observe the received power at desired observation points, the received power is observed at different times. In this case, the results of the received power observed at different times will be reflected in the same received power distribution. For example, a situation can be imagined in which a sensor is installed on a moving object such as a person or a vehicle, and the positions where the received power is observed and the received power are collected along the trajectory of the moving object.

[0005] On the other hand, it is generally known that radio waves are attenuated by the influence of obstacles, resulting in a decrease in the received power of the radio waves received by a receiver. Patent Document 1 discloses the configuration of an estimation device that, when a receiver receives a wireless signal, calculates the propagation loss from the received power and determines the number of obstructions between the transmitter and receiver using the propagation loss. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2020 / 090540 Summary of the Invention [Problem to be solved by the invention]

[0007] However, although the estimation device disclosed in Patent Document 1 can determine the number of obstructions present between a transmitter and a receiver, it cannot estimate the received power around the obstructions. Therefore, even if the estimation result output from the estimation device disclosed in Patent Document 1 is used, there is a problem in that it is not possible to create a received power distribution around the obstructions.

[0008] An object of the present disclosure is to provide an information processing device, an information processing system, a data generation method, and a program that can create a received power distribution around a shield or obstacle. [Means for solving the problem]

[0009] An information processing device according to a first aspect of the present disclosure includes a detection unit that detects the presence of an obstacle using a measurement value of received power measured by a measurement device that receives radio waves, an estimation unit that estimates a change in received power in a specified area before detecting the presence of the obstacle and after detecting the presence of the obstacle, and an update unit that updates a first received power distribution in the specified area that is generated based on the measurement value before detecting the presence of the obstacle and stored in a storage device using the change in received power.

[0010] An information processing system according to a second aspect of the present disclosure includes an information processing device having a measuring device that measures the received power of radio waves, a detection unit that detects the presence of an obstacle using the measurement value of the received power measured by the measuring device, an estimation unit that estimates a change in the received power in a specified area before and after detecting the presence of the obstacle, and an update unit that updates a first received power distribution in the specified area that is generated based on the measurement value before detecting the presence of the obstacle and stored in a storage device using the change in the received power.

[0011] A data generation method according to a third aspect of the present disclosure detects the presence of an obstacle using a measurement value of received power measured by a measuring device that receives radio waves, estimates a change in received power in a specified area before and after detecting the presence of the obstacle, and updates a first received power distribution in the specified area that was generated based on the measurement value before detecting the presence of the obstacle and stored in a storage device using the change in received power.

[0012] A program according to a fourth aspect of the present disclosure causes a computer to detect the presence of an obstacle using a measurement value of received power measured by a measuring device that receives radio waves, estimate a change in received power in a specified area before and after detecting the presence of the obstacle, and update a first received power distribution in the specified area that is stored in a storage device and that was generated based on the measurement value before detecting the presence of the obstacle, using the change in received power. [Effects of the Invention]

[0013] The present disclosure can provide an information processing device, an information processing system, a data generation method, and a program that can create a received power distribution around a shield or obstacle. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a configuration diagram of an information processing device according to a first embodiment. [Figure 2] FIG. 2 is a diagram illustrating a processing flow of the data generating method according to the first embodiment. [Figure 3] FIG. 10 is a configuration diagram of a measurement device according to a second embodiment. [Figure 4] FIG. 10 is a diagram illustrating measurement of received power within a predetermined area according to the second embodiment. [Figure 5] FIG. 10 is a configuration diagram of an information processing device according to a second embodiment. [Figure 6] FIG. 10 is a diagram illustrating measurement of received power within a predetermined area according to the second embodiment. [Figure 7] FIG. 10 is a diagram illustrating an area where an obstacle affects received power according to the second embodiment. [Figure 8] FIG. 10 is a diagram illustrating a flow of a process for generating a received power distribution according to the second embodiment. [Figure 9] FIG. 10 is a diagram illustrating actual measured values ​​of received power measured by a measuring device according to the second embodiment. [Figure 10] FIG. 10 is a diagram illustrating a received power distribution according to the second embodiment. [Figure 11] FIG. 10 is a diagram showing a flow of a received power distribution update process according to the second embodiment. [Figure 12] FIG. 10 is a diagram illustrating actual measured values ​​of received power measured by a measuring device according to the second embodiment. [Figure 13] FIG. 10 is a diagram showing a received power distribution obtained by a simulation according to the second embodiment. [Figure 14] FIG. 10 is a diagram showing a received power distribution obtained by a simulation according to the second embodiment. [Figure 15] FIG. 10 is a diagram illustrating a difference distribution of received power according to the second embodiment. [Figure 16] FIG. 10 is a diagram illustrating a received power distribution according to the second embodiment. [Figure 17] FIG. 11 is a diagram showing actual measured values ​​of received power measured by a measuring device according to a third embodiment. [Figure 18] FIG. 11 is a diagram showing a received power distribution according to the third embodiment. [Figure 19] 1A and 1B are configuration diagrams of an information processing device and a measurement device according to respective embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0015] (Embodiment 1) Hereinafter, embodiments of the present invention will be described with reference to the drawings. An example of the configuration of an information processing device 10 according to the first embodiment will be described with reference to FIG. 1. The information processing device 10 may be a computer device that operates when a processor executes a program stored in a memory. The information processing device 10 may be, for example, a server device.

[0016] The information processing device 10 includes a detection unit 11, an estimation unit 12, and an update unit 13. The detection unit 11, the estimation unit 12, and the update unit 13 may be software or modules that are executed by a processor executing a program stored in a memory, or may be hardware such as a circuit or a chip.

[0017] The detection unit 11 detects the presence of an obstacle using the measurement value of the received power measured by a measurement device that receives the radio waves. The radio waves may simply be referred to as radio waves. The measurement device may be, for example, a sensor that can receive the radio waves and measure the received power. Receiving radio waves may be rephrased as receiving a radio signal. The detection unit 11 may obtain the measurement value of the received power from the measurement device, for example, via a network. Alternatively, when the measurement device is used as a device integrated with the information processing device 10, the detection unit 11 may obtain the measurement value output from the measurement device via an internal bus of the information processing device 10, for example.

[0018] The detection unit 11 detects an obstacle between the transmitter and the receiver, for example, by using the position of a transmitter transmitting a wireless signal, the measurement position of the received power, and the attenuation rate of the radio wave of the wireless signal received at the measurement position. The attenuation rate may be referred to as propagation loss. For example, the detection unit 11 may detect an obstacle by comparing the attenuation rate at the measurement position estimated when no obstacle is present with the attenuation rate of the actual received power at the measurement position. The detection unit 11 may detect an obstacle by using the amount of attenuation instead of the attenuation rate.

[0019] The estimation unit 12 estimates a change in the received power in a predetermined area before and after detecting the presence of an obstacle. Before and after detecting the presence of an obstacle may be rephrased as, for example, before and after the detection unit 11 detects an obstacle.

[0020] The estimation unit 12 may estimate the value of the received power in a predetermined area by performing a simulation, and estimate a change in the received power in the predetermined area before and after detecting the presence of an obstacle. The estimation unit 12 may use, for example, a ray tracing method to estimate the received power distribution in the predetermined area before detecting the presence of an obstacle and the received power distribution in the predetermined area after detecting the presence of the obstacle. The change in received power may be, for example, a value indicating the difference between the received power in the predetermined area before detecting the presence of an obstacle and the received power after detecting the presence of the obstacle.

[0021] The update unit 13 updates the received power distribution for a predetermined area, which was generated based on measurement values ​​before detecting the presence of an obstacle and is stored in the storage device 15, using a change in the received power. The received power distribution for a predetermined area generated based on measurement values ​​before detecting the presence of an obstacle may be generated or calculated using the IDW method or the Kriging algorithm for the measurement values ​​of the received power in the predetermined area. The update unit 13 may reflect a change in the received power estimated by the estimation unit 12 in the received power distribution for a predetermined area generated based on measurement values ​​before detecting the presence of an obstacle. For example, if the received power in the predetermined area after detecting the presence of an obstacle is lower than the received power before detecting the presence of an obstacle, the update unit 13 may update the received power distribution to lower the received power in the predetermined area. The received power distribution for a predetermined area may be stored in the storage device 15, which is a device different from the information processing device 10, or may be stored in a storage device (not shown) included in the information processing device 10. The update unit 13 may read the received power distribution from the storage device 15 or a storage device included in the information processing device 10. The update unit 13 may read the received power distribution from the storage device 15 via at least one of a wired and / or wireless network, or may read the received power from the storage device 15 using at least one of a wired cable and short-range wireless communication. The short-range wireless communication may be wireless communication using Bluetooth (registered trademark), for example. The storage device of the information processing device 10 may be, for example, an internal memory installed inside the information processing device 10, or an external memory attachable to the information processing device 10. The internal memory may be referred to as a main memory or a built-in memory, etc.

[0022] Next, the data generation method according to the first embodiment will be described with reference to Fig. 2. First, the detection unit 11 detects the presence of an obstacle using the measurement value of the received power measured by the measurement device that received the radio wave (S11). Next, the estimation unit 12 estimates the change in the received power in a predetermined area before and after detecting the presence of the obstacle (S12). Next, the update unit 13 updates the first received power distribution in the predetermined area, which was generated based on the measurement value before detecting the presence of the obstacle, using the change in the received power (S13).

[0023] As described above, the information processing device 10 reflects the change in the received power before and after detecting the presence of an obstacle, which is obtained by simulation, in the received power distribution generated based on the measurement values. This allows the information processing device 10 to generate the received power distribution of the area around the obstacle after detecting the presence of the obstacle.

[0024] (Embodiment 2) Next, a configuration example of the measuring device 20 according to the second embodiment will be described with reference to FIG. 3. The measuring device 20 may be a computer device that operates when a processor executes a program stored in a memory. The measuring device 20 may be, for example, a sensor device. Furthermore, the measuring device 20 may be attached to a moving object. The moving object may be, for example, a vehicle. Specifically, the moving object may be an AGV (Automatic Guided Vehicle). Alternatively, the moving object may be an air vehicle controlled using a wireless signal. Alternatively, the measuring device 20 may be held by a moving person.

[0025] The measurement device 20 has a power information acquisition unit 21, a position information acquisition unit 22, and a communication unit 23. The power information acquisition unit 21, the position information acquisition unit 22, and the communication unit 23 may be software or modules that are executed by a processor executing a program stored in a memory, or may be hardware such as a circuit or a chip.

[0026] The power information acquisition unit 21 receives radio waves transmitted from a transmission source and measures the received power of the received radio waves. In other words, the power information acquisition unit 21 identifies the received power of the received radio waves. Identifying the received power may be rephrased as detecting the received power. The transmission source may be rephrased as a transmitting device or a transmitter. The transmission source may be, for example, an access point used as a so-called master device in a wireless LAN (Local Area Network). Alternatively, the transmission source may be a base station used for mobile communication. In other words, the transmission source may be a device that transmits radio waves and forms a communication area that enables wireless communication.

[0027] The power information acquiring unit 21 indicates the received power of the radio waves using units such as dBm or watts. When multiple sources are transmitting radio waves, the power information acquiring unit 21 may receive multiple radio waves and determine the received power of each radio wave. Alternatively, the power information acquiring unit 21 may combine multiple radio waves and determine the received power of the combined radio waves. The power information acquiring unit 21 may periodically determine the received power of the received radio waves. Alternatively, the power information acquiring unit 21 may determine the received power of the radio waves at any timing, for example, based on an operation by a user operating the measuring device 20. Alternatively, the power information acquiring unit 21 may determine the received power of the radio waves when it is detected that a moving object has moved a predetermined distance.

[0028] Here, measurement of received power within a predetermined area will be described using FIG. 4. FIG. 4 shows a diagram viewed from above of an area having a certain amount of space, such as a warehouse or factory where AGVs move. The multiple rectangular shapes in FIG. 4 represent obstacles. Because radio waves are blocked by obstacles, the obstacles may also be referred to as shields. The obstacles may be, for example, pillars or shelves in a warehouse. The circular shapes in FIG. 4 represent radio wave sources. The measurement device 20 moves as shown by the arrows in FIG. 4 and measures the received power in the area shown in FIG. 4. The measurement device 20 may also measure the received power on routes or trajectories other than those shown by the arrows in FIG. 4.

[0029] Returning to FIG. 3 , the position information acquisition unit 22 acquires the position information of the measuring device 20. The measuring device 20 may be installed on a mobile object and measure received radio waves while the mobile object is moving. The position information acquisition unit 22 may identify the position information of the measuring device 20 using, for example, a global navigation satellite system (GNSS) such as a global positioning system (GPS). Alternatively, the position information acquisition unit 22 may identify the position information of the measuring device 20 using information related to the number of tire rotations of the mobile object and steering operation information. Alternatively, the position information acquisition unit 22 may recognize the position of a radio wave source in advance and identify the position information according to the value of the received power of the radio waves transmitted from the source.

[0030] Furthermore, the location information acquiring unit 22 may identify location information indicating the current location of the measuring device 20 at the time when the power information acquiring unit 21 measured the received radio waves. In other words, the location information acquiring unit 22 may identify the measurement point where the power information acquiring unit 21 measured the received radio waves.

[0031] The communication unit 23 transmits reception power information indicating the value of reception power and location information to the information processing device 30. The communication unit 23 may transmit information to the information processing device 30 via at least one of a wired line and a wireless line. The communication via a wireless line may be, for example, wireless communication used in a mobile network managed by a telecommunications carrier or wireless communication used in wireless LAN communication. Alternatively, the communication unit 23 may communicate with the information processing device 30 using Bluetooth (registered trademark).

[0032] The communication unit 23 associates the received power information with location information indicating the measurement point where the received power was measured, and transmits the associated information to the information processing device 30. The association of the received power information with the location information may be performed by the power information acquisition unit 21 or the location information acquisition unit 22.

[0033] Next, a configuration example of an information processing device 30 according to the second embodiment will be described with reference to Fig. 5. The information processing device 30 has a configuration in which a distribution generation unit 31 and a communication unit 32 are added to the information processing device 10. The distribution generation unit 31 and the communication unit 32 may be software or modules that are executed by a processor executing a program stored in a memory. Alternatively, the distribution generation unit 31 and the communication unit 32 may be hardware such as a circuit or a chip. In the following, functions that differ from the information processing device 10 in Fig. 1 or detailed functions of the information processing device 10 will be mainly described.

[0034] The communication unit 32 receives received power information and location information associated with the received power from the measurement device 20. The location information associated with the received power is location information indicating the measurement point where the received power was measured. The communication unit 32 outputs the received power information and location information to the detection unit 11 and the distribution generation unit 31.

[0035] The distribution generation unit 31 generates information representing a received power distribution (hereinafter, may be simply referred to as a "received power distribution") using the received power information and the position information. For example, the distribution generation unit 31 generates the received power distribution using the IDW algorithm or the Kriging algorithm. Specifically, the distribution generation unit 31 generates the received power distribution in the area shown in FIG. 4. The distribution generation unit 31 stores in advance a map showing the positions of obstacles, etc. in the area shown in FIG. 4, and generates the received power distribution by reflecting received power values ​​in the map. The distribution generation unit 31 outputs the generated received power distribution to the detection unit 11 and the update unit 13. The distribution generation unit 31 may read a map stored in the storage device 15 or a storage device included in the information processing device 10. Furthermore, the distribution generation unit 31 may store the generated received power distribution in the storage device 15 or a storage device included in the information processing device 10. The distribution generation unit 31 may communicate with the storage device 15 via the communication unit 32.

[0036] The detection unit 11 periodically or at any timing receives the received power and location information associated with the received power from the communication unit 32. The detection unit 11 compares the received power distribution received from the distribution generation unit 31 with the received power received periodically or at any timing from the communication unit 32. The detection unit 11 determines whether the difference between the received power associated with the location information received from the communication unit 32 and the received power indicated by the received power distribution at the location indicated by the location information received from the communication unit 32 is greater than a predetermined value.

[0037] For example, the detection unit 11 may detect the presence of an obstacle near a position where the difference between the received power received from the communication unit 32 and the received power shown in the received power distribution is greater than a predetermined value. Detecting the presence of an obstacle can be rephrased as detecting the occurrence of an obstacle. Detecting the occurrence of an obstacle means that an obstacle that did not exist when the distribution generation unit 31 generated the received power distribution has appeared after the distribution generation unit 31 generated the received power distribution. The appeared obstacle may be, for example, a moving vehicle, a walking person, or a newly installed shelf. For example, if the received power shown in the received power distribution is greater than the received power received from the communication unit 32, this indicates that an obstacle has appeared between the measurement position of the received power and the transmission source, and the measuring device 20 has received radio waves attenuated by the obstacle. Furthermore, if the received power shown in the received power distribution is less than the received power received from the communication unit 32, this indicates that the measuring device 20 has received radio waves directly from the transmission source and also received radio waves reflected by an obstacle.

[0038] The detection unit 11 estimates the position of the obstacle using the position of the transmission source, the measurement position of the received power, and the attenuation rate or amplification rate of the received power. The detection unit 11 may store information about the position of the transmission source in advance.

[0039] FIG. 6 shows an extracted portion of the area surrounded by a dotted line in the area described in FIG. 4. FIG. 6 shows the trajectory of radio waves observed by the measurement device 20, the source of the radio waves, and a newly appeared obstacle. The dotted rectangular shape in the extracted area indicates a new obstacle that appeared after the received power distribution was generated. Trajectory R1 shows the trajectory of radio waves observed by the measurement device 20 before the obstacle appeared. Trajectory R2 shows the trajectory of radio waves observed by the measurement device 20 after the obstacle appeared.

[0040] Radio waves transmitted from the source are attenuated by a newly-appearing obstacle, and at positions on locus R2 where the attenuated radio waves are received, the received power value is lower than the value shown in the received power distribution. Even if the received power value on locus R2 is reflected in the received power distribution, it is not possible to reflect the information about the decrease or increase in received power around locus R2, i.e., around the newly-appearing obstacle. In other words, even if the received power value on locus R2 is reflected in the received power distribution, only the received power on locus R2 decreases or increases, and the received power value at positions other than locus R2 remains the same as the received power value shown in the received power distribution. Therefore, the estimation unit 12 estimates the influence of the newly-appearing obstacle.

[0041] The estimation unit 12 simulates the received power around a newly generated obstacle using the position of the obstacle estimated by the detection unit 11, the position of the source, the transmission power of the radio waves emitted from the source, the angle of the antenna at the source, and the like. The estimation unit 12 may previously store information regarding the position of the source and the transmission power of the radio waves emitted from the source. For example, the estimation unit 12 simulates the received power in area A1 shown in FIG. 7. A1 is an area where it is estimated that the radio waves emitted from the source will be blocked by a newly generated obstacle, resulting in a decrease in received power. For example, the estimation unit 12 may estimate the received power in area A1 by performing ray tracing using the position of the obstacle estimated by the detection unit 11, the position of the source, and the transmission power of the radio waves emitted from the source. When performing ray tracing, the estimation unit 12 may use information regarding the angle of the antenna at the source. By performing ray tracing, the estimation unit 12 obtains a power distribution that takes into account the diffraction of electromagnetic waves and the like. Alternatively, the estimation unit 12 may estimate the received power at A1 by applying the position of the obstacle, the position of the source, the transmission power of the radio waves emitted by the source, etc. to a learning model generated using the actual measured value of the received power of radio waves blocked by an obstacle, which has been measured in advance, as training data.

[0042] The update unit 13 updates the received power distribution by reflecting the simulation result in the estimation unit 12 in the received power distribution generated in the distribution generation unit 31. The update unit 13 may read out the received power distribution stored in the storage device 15 or a storage device included in the information processing device 10. Furthermore, the update unit 13 may store the updated received power distribution in the storage device 15 or the information processing device 10. The update unit 13 may communicate with the storage device 15 via the communication unit 32.

[0043] The communication unit 32 transmits the updated received power distribution to a display device or the like.

[0044] Next, the flow of the process of generating the received power distribution in the distribution generation unit 31 will be described with reference to Fig. 8. First, the distribution generation unit 31 receives the measurement value of the received power measured by the measurement device 20 and location information indicating the measurement location of the received power from the measurement device 20 (S21). For example, as shown in Fig. 6, the measurement device 20 measures the received power while moving within the area along a trajectory R1.

[0045] Here, the received power distribution measured by the measuring device 20 will be specifically described using Figure 9. Figure 9 shows an area extracted from the area that is thought to be particularly affected by a newly appearing obstacle. For example, Figure 9 shows the received power distribution in area A1 in Figure 7. Figure 9 explains the case where the measuring device 20 receives radio waves in the 400 MHz band as an example. When receiving a wireless signal, the measuring device 20 receives radio waves in a certain frequency band. Here, it is assumed that the wireless communication that is subject to interference uses a frequency band with a 1 MHz frequency width centered around 400 MHz, and the measuring device 20 receives radio waves in this frequency band.

[0046] First, the measuring device 20 receives radio waves of 400 MHz ±0.5 MHz for approximately one second, takes the average value as the received power, and stores the measurement location as location information. The measuring device 20 repeatedly measures the received power and stores the location information every second, traveling along a predetermined route within the area where the received power distribution is to be generated. The measuring device 20 transmits the measured received power and location information to the information processing device 30. The measuring device 20 may periodically transmit multiple pieces of received power and location information together to the information processing device 30, or may transmit the received power and location information to the information processing device 30 each time it obtains a piece of received power and location information. The time period for which the measuring device 20 measures the received power is not limited to one second and may be changed depending on the accuracy of the received power distribution.

[0047] For example, the distribution generation unit 31 may calculate the received power distribution using the measurement values ​​for one revolution after the information processing device 30 has made one revolution around the route. FIG. 9 shows the measurement values ​​of received power measured by the measurement device 20 in a certain area. The measurement values ​​may be referred to as actual measurements, measured values, or the like. For example, the measurement device 20 moves along the leftmost column in FIG. 9 and measures the received power every second, and then moves along the third column from the left and measures the received power again. The numerical values ​​shown in the figure are in dBm and are values ​​with the decimal point rounded down.

[0048] Returning to FIG. 8, next, the distribution generation unit 31 generates a received power distribution using the received received power and location information (S22). For example, the distribution generation unit 31 generates the received power distribution using the IDW method or the Kriging method. Using the actual measurement values ​​shown in FIG. 9, for example, the measuring device 20 interpolates the received power at positions where no actual measurement values ​​exist using the IDW method or the Kriging method, as shown in FIG. 10. In this way, the distribution generation unit 31 generates a received power distribution by combining the actual measurement values ​​and the estimated values ​​estimated using the IDW method or the Kriging method.

[0049] Next, the flow of the update process of the received power distribution in the update unit 13 will be described with reference to Fig. 11. Here, as in Fig. 9, the case where the measuring device 20 receives radio waves in the 400 MHz band while moving will be described as an example.

[0050] First, the detection unit 11 detects the occurrence of an obstacle using the received power received from the communication unit 32 periodically or at any timing (S31). For example, the detection unit 11 receives the received power shown in FIG. 12. FIG. 12 shows actual measurement values ​​of the received power in the same area as the received power distribution shown in FIG. 10. Specifically, the detection unit 11 newly receives the received power in the leftmost column of FIG. 12. The received power values ​​in the third column from the left in FIG. 12 are previous actual measurement values. The received power in the leftmost column of FIG. 12 has a value of −97 in the second row from the top, −99 in the third row, and −97 in the fourth row, which differs by 7 to 9 dBm from the values ​​shown in the received power distribution of FIG. 10.

[0051] The detection unit 11 may determine that an obstacle has occurred if the difference between the received power distribution value and the actual measured value is greater than a threshold. For example, if the threshold is 5 dBm, the detection unit 11 determines that the received power at the positions in the leftmost column of FIG. 12, from the second to fourth rows from the top, has become low due to the influence of a newly-occurred obstacle. Furthermore, the detection unit 11 estimates the position of the obstacle using the position of the transmission source, the measurement position of the received power, and the attenuation rate or amplification rate of the received power. The attenuation rate and amplification rate may be used instead of the attenuation rate and amplification rate. The detection unit 11 may store information about the position of the transmission source in advance.

[0052] Returning to FIG. 11 , next, the estimation unit 12 generates an influence range of an obstacle and an influence degree of the obstacle (S32). Specifically, the estimation unit 12 simulates the received power around a newly generated obstacle using the previously stored position of the transmission source, the transmission power of the radio waves emitted by the transmission source, and the position of the obstacle estimated by the detection unit 11. The estimation unit 12 simulates the received power distribution before the obstacle appears and the received power distribution after the new obstacle appears, for example, by performing ray tracing. FIG. 13 shows the simulation result of the received power distribution before the obstacle appears, and FIG. 14 shows the simulation result of the received power distribution after the new obstacle appears. Furthermore, FIG. 15 shows the difference distribution between the received power distribution before the obstacle appears and the received power distribution after the new obstacle appears. The difference distribution indicates a value obtained by subtracting each value of the received power component in FIG. 13 from each value of the received power distribution in FIG. 14. Fig. 14 shows that the area of ​​the received power distribution shown in Fig. 10 is affected by obstacles. The difference distribution in Fig. 15 shows the extent to which the received power is reduced due to the influence of obstacles. Fig. 13 shows the received power distribution generated by simulation, and there is a difference in value between this and the received power distribution in Fig. 10 generated based on actual measurements.

[0053] Next, the update unit 13 reflects the influence range and the influence degree of the obstacle estimated by the estimation unit 12 in the received power distribution (S33). For example, the update unit 13 obtains a received power distribution that takes into account the influence of the obstacle by summing the received power distribution of Fig. 10 and the difference distribution of Fig. 15. Fig. 16 shows the updated received power distribution obtained by summing the received power distribution of Fig. 10 and the difference distribution of Fig. 14.

[0054] As described above, the information processing device 30 determines the presence or absence of an obstacle based on the actual measurement value of the received power in a certain area. Furthermore, the information processing device 30 generates the influence range of the obstacle and the degree of influence of the obstacle on the received power distribution by performing a simulation. Furthermore, the information processing device 30 generates a received power distribution that reflects the influence of the obstacle on the received power distribution. In this way, the information processing device 30 can update the received power distribution using not only the received power in a part of the area used to detect the occurrence of an obstacle, but also the received power in a range affected by the occurrence of an obstacle.

[0055] (Embodiment 3) Next, the update process of the received power distribution according to the third embodiment will be described with reference to Fig. 17. Fig. 17 shows actual measurement values ​​of the received power measured by the measuring device 20 after the received power distribution shown in Fig. 10 was generated. Fig. 17 shows actual measurement values ​​different from those shown in Fig. 12. Furthermore, the detection unit 11 detects the occurrence of a new obstacle based on the actual measurement values ​​of the received power shown in Fig. 17. Here, it is assumed that the simulation result in the estimation unit 12 is the received power distribution shown in Figs. 13 and 14, as in the second embodiment. That is, in the third embodiment, the influence range and the influence degree of the obstacle obtained by the simulation performed by the estimation unit 12 are the same as those in Figs. 13 and 14 specified in the second embodiment. Meanwhile, the actual measurement values ​​of the received power used to detect the obstacle are the values ​​shown in Fig. 17, not the values ​​shown in Fig. 12.

[0056] Here, as in the second embodiment, when the difference distribution of Fig. 15 obtained by simulation is reflected on the received power distribution shown in Fig. 10, the influence of the newly appeared obstacle becomes larger than the actual measurement value shown in Fig. 17. Specifically, in Fig. 17, the received power of the second to fourth items from the top in the leftmost column is -93 or -95. On the other hand, when the difference distribution of Fig. 15 obtained by simulation is reflected on the received power distribution shown in Fig. 10, the received power of the second to fourth items from the top in the leftmost column is -95 or -97, as shown in Fig. 16.

[0057] Therefore, in the third embodiment, the value of the differential distribution to be summed with the received power distribution is adjusted as follows. Here, the received power distribution shown in FIG. 10 and generated by the distribution generation unit 31 is denoted as Pr. Furthermore, the received power distribution obtained as a simulation result before the obstacle appears is denoted as Pne, and the received power distribution obtained as a simulation result after the obstacle appears is denoted as Pe. In this case, if the differential distribution is denoted as Pd, it is calculated as Pd=Pe-Pne.

[0058] Furthermore, if the received power distribution updated based on the differential distribution is Pm, Pm is expressed as Pm=Pr+aPd, where a is a positive value. Furthermore, if a position determined by specifying a column and a row as shown in FIG. 17 etc. is L, it may be expressed as Pm(L)=Pr(L)+aPd(L). In this case, Pm(L)=Pr(L)+aPd(L) indicates the value of the received power after updating at position L. Position L indicates a position specified using squares in the area shown in FIG. 17 etc. For example, position L may indicate one square, multiple squares in one column, multiple squares in one row, multiple dispersed squares, etc.

[0059] Here, in the second embodiment, it is assumed that the received power distribution Pm is calculated with a=1. On the other hand, in the third embodiment, for example, the value of a may be set to 0.5. In this case, the received power distribution Pm becomes the distribution shown in Fig. 18. In Fig. 18, values ​​are shown with decimal points discarded. In this way, by setting the value of a to 0.5, it is possible to make the received power distribution shown in Fig. 18 closer to the actually measured values ​​shown in Fig. 17 compared to when a=1.

[0060] Here, the value by which the difference distribution is multiplied is not limited to 0.5. For example, a value of a may be calculated that minimizes the squared error between the received power distribution Pm and the actual measurement values ​​in FIG. 17. For example, when a=1, the difference between the actual measurement values ​​in FIG. 17 and the received power of the received power distribution Pm corresponding to the position where the actual measurement values ​​were measured is [(-90, -97, -99, -97, -90) - (-90, -93, -95, -93, -90)] = (0, -4, -4, -4, 0). In this case, the squared error is calculated by squaring each element indicating the difference and calculating the sum, which is 48. When a=0.5, the squared error is calculated by squaring each element indicating the difference and calculating the sum, which is 0.75. When the value of a is searched for in this manner, when a=0.49, the sum is calculated by squaring each element indicating the difference and calculating the sum, which is 0.71, which is the minimum. In such a case, the update unit 13 may use a=0.49.

[0061] Furthermore, when Pm(L) = Pr(L) + aPd(L), the value of a may be calculated as a = (min(R) - max(R)) / [min(Pd(L)) - max(Pd(L))]. " / " is a symbol representing division. min(R) and max(R) indicate the minimum and maximum values ​​of the measured values ​​shown in FIG. 17. Furthermore, min(Pd(L)) and max(Pd(L)) indicate the minimum and maximum values ​​of the values ​​shown in the difference distribution shown in FIG. 15. The value of a calculated in this way is 5 / 9.

[0062] As described above, by adding a value obtained by multiplying the value of the received power in the difference distribution by the coefficient a to the received power distribution Pr, the value of the updated received power distribution Pm can be made closer to the actually measured value.

[0063] FIG. 19 is a block diagram showing a configuration example of an information processing device 10, a measuring device 20, and an information processing device 30 (hereinafter referred to as information processing device 10, etc.). Referring to FIG. 19, the information processing device 10, etc. includes a network interface 1201, a processor 1202, and a memory 1203. The network interface 1201 may be used to communicate with a network node (e.g., eNB, MME, P-GW, etc.). The network interface 1201 may include, for example, a network interface card (NIC) conforming to the IEEE 802.3 series. Here, eNB stands for evolved Node B, MME stands for Mobility Management Entity, and P-GW stands for Packet Data Network Gateway. IEEE stands for Institute of Electrical and Electronics Engineers.

[0064] The processor 1202 reads and executes software (computer programs) from the memory 1203 to perform the processing of the information processing device 10 and the like described using flowcharts in the above-described embodiments. The processor 1202 may be, for example, a microprocessor, an MPU, or a CPU. The processor 1202 may include multiple processors.

[0065] The memory 1203 is configured by a combination of volatile memory and non-volatile memory. The memory 1203 may include storage located remotely from the processor 1202. In this case, the processor 1202 may access the memory 1203 via an I / O (Input / Output) interface (not shown).

[0066] 19, the memory 1203 is used to store a group of software modules. The processor 1202 reads and executes these software modules from the memory 1203, thereby performing the processing of the information processing device 10 and the like described in the above-described embodiment.

[0067] As explained using FIG. 19, each of the processors possessed by the information processing device 10 in the above-described embodiment executes one or more programs including a group of instructions for causing a computer to perform the algorithm explained using the drawings.

[0068] In the above examples, the program includes instructions (or software code) that, when loaded into a computer, cause the computer to perform one or more functions described in the embodiments. The program may be stored on a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, computer-readable medium or tangible storage medium includes random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disc (DVD), Blu-ray® disc or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The program may also be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, transitory computer-readable medium or communication medium includes electrical, optical, acoustic, or other forms of propagated signals.

[0069] The present disclosure is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present disclosure. For example, in the above-described embodiment, a case where the received power value decreases due to an obstacle is described, but the same calculation can be performed even if there is an area where the received power value increases due to the influence of reflection.

[0070] Some or all of the above-described embodiments can be described as, but are not limited to, the following supplementary notes. [Explanation of symbols]

[0071] 10. Information processing equipment 11 Detection unit 12 Estimation part 13 Update section 15 Storage device 20 Measuring equipment 21 Power information acquisition section 22 Location information acquisition section 23 Communications Department 30 Information processing equipment 31 Distribution generator 32 Communications Department

Claims

1. a detection unit that detects the position of an obstacle using a measurement value of received power measured by a measurement device that receives the radio wave, the measurement position of the received power, and the position of a source of the radio wave; an estimation unit that estimates a change in received power in a predetermined area before the obstacle is present and after the position of the obstacle is detected; an updating unit that updates a first received power distribution in the predetermined area, which is generated based on a measurement value of the received power measured by the measuring device before the obstacle is present and stored in a storage device, using a change in the received power; The estimation unit generating a difference distribution indicating a difference between a second received power distribution in the predetermined area before the obstacle is present, which is estimated using the position of the source of the radio waves, and a third received power distribution in the predetermined area after the position of the obstacle is detected, which is estimated using the position of the source of the radio waves and the position of the obstacle; The update unit An information processing device that updates the first received power distribution using the difference distribution.

2. The estimation unit The information processing device according to claim 1 , wherein the change in received power in the predetermined area is estimated using the position of the source of the radio wave and the position of the obstacle.

3. The update unit 2. The information processing device according to claim 1, wherein the difference distribution is corrected using measurement values ​​of the predetermined area measured after detecting the presence of the obstacle, and the first received power distribution is updated using the corrected difference distribution.

4. The update unit 4. The information processing device according to claim 1, wherein a coefficient is calculated to be multiplied by a difference value of the received power in a first area included in the difference distribution so that when the difference value of the received power in the first area included in the first received power distribution is added, the sum approaches a measurement value measured after detecting the position of the obstacle in the first area, and the first received power distribution is updated by adding a value obtained by multiplying all difference values ​​included in the difference distribution by the coefficient to the first received power distribution.

5. a measuring device for measuring the received power of radio waves; an information processing device having: a detection unit that detects the position of an obstacle using the measurement value of the received power measured by the measurement device, the measurement position of the received power, and the position of a source of the radio wave; an estimation unit that estimates a change in the received power in a predetermined area before the obstacle exists and after the position of the obstacle has been detected; and an update unit that updates a first received power distribution in the predetermined area, which is generated based on the measurement value before the presence of the obstacle is detected and stored in a storage device, using the change in the received power; The estimation unit generating a difference distribution indicating a difference between a second received power distribution in the predetermined area before the obstacle is present, which is estimated using the position of the source of the radio waves, and a third received power distribution in the predetermined area after the position of the obstacle is detected, which is estimated using the position of the source of the radio waves and the position of the obstacle; The update unit An information processing system that updates the first received power distribution using the difference distribution.

6. The estimation unit 6. The information processing system according to claim 5, wherein a change in received power in the predetermined area is estimated using the position of the source of the radio wave and the position of the obstacle.

7. Detecting the position of an obstacle using a measurement value of the received power measured by a measuring device that received the radio wave, the measurement position of the received power, and the position of the source of the radio wave; Estimating a change in received power in a predetermined area before the obstacle is present and after the position of the obstacle is detected; updating a first reception power distribution in the predetermined area, which was generated based on the measurement values ​​before detecting the presence of the obstacle and is stored in a storage device, using the change in the reception power; When estimating the change in received power, generating a difference distribution indicating a difference between a second received power distribution in the predetermined area before the obstacle is present, which is estimated using the position of the source of the radio waves, and a third received power distribution in the predetermined area after the position of the obstacle is detected, which is estimated using the position of the source of the radio waves and the position of the obstacle; When updating the first received power distribution, updating the first received power distribution using the difference distribution; Data generation method.

8. Detecting the position of an obstacle using a measurement value of the received power measured by a measuring device that received the radio wave, the measurement position of the received power, and the position of the source of the radio wave; Estimating a change in received power in a predetermined area before the obstacle is present and after the position of the obstacle is detected; updating a first reception power distribution in the predetermined area, which was generated based on the measurement values ​​before detecting the presence of the obstacle and is stored in a storage device, using the change in the reception power; When estimating the change in received power, generating a difference distribution indicating a difference between a second received power distribution in the predetermined area before the obstacle is present, which is estimated using the position of the source of the radio waves, and a third received power distribution in the predetermined area after the position of the obstacle is detected, which is estimated using the position of the source of the radio waves and the position of the obstacle; When updating the first received power distribution, A program that updates the first received power distribution using the difference distribution.

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