Surrounding environment evaluation device, surrounding environment evaluation program, and surrounding environment evaluation method

Abstract

To obtain a surrounding environment evaluation device that can reduce unnecessary communication downtime. [Solution] The system is characterized by comprising: an information acquisition unit that acquires location information of a mobile terminal 300, surrounding environment information indicating the surrounding environment 800 of the mobile terminal 300, connection destination information of the mobile terminal 300, radio wave strength information indicating the radio wave strength received by the mobile terminal 300, and radio wave arrival direction information indicating the direction from which the radio waves received by the mobile terminal 300 are coming; a surrounding environment evaluation unit that evaluates whether the change in the surrounding environment 800 of the mobile terminal 300 is temporary based on the information acquired by the information acquisition unit, and determines whether or not to update the spot cell connection map based on the evaluation result; and a data transmission / reception unit that transmits the updated spot cell connection map, or the determination result, to a database 500 based on the determination result of whether or not to update the spot cell connection map.

Description

[Technical Field]

[0001] This disclosure relates to a surrounding environment evaluation device, a surrounding environment evaluation program, and a surrounding environment evaluation method for evaluating the surrounding environment of a mobile terminal. [Background technology]

[0002] In the field of wireless communication, when multiple connection destinations exist at the location of a mobile terminal, the mobile terminal needs to select a destination. For example, in the railway sector, public 5G and local 5G are expected to be used for applications that communicate between the ground and on board trains, or to complement private railway networks. In the future, it is envisioned that public 5G will be built with coverage areas for the entire railway line and stations, and local 5G coverage areas will be built as spot cells on station platforms and other locations. In this case, since local 5G areas will exist within public 5G areas, when a mobile terminal enters a local 5G area, there will be multiple connection destinations for the mobile terminal, and the mobile terminal will need to select a destination.

[0003] Patent Document 1 discloses a method for a mobile terminal to select a connection destination from among multiple candidate external communication devices by storing information such as the location of the mobile terminal, the radio wave strength for each candidate external communication device, the communication speed, and the communication delay as a radio wave map, obtaining location information from the mobile terminal, and providing the communication speed and communication delay at that location. Since a communication interruption occurs when switching connection destinations, it is desirable to minimize the duration of the communication interruption. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-69269 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] However, with the conventional technology described above, if the communication status at a specific location changes due to changes in the surrounding environment, the radio wave map will be updated even if the change in the surrounding environment is only temporary. As a result, since the connection destination is selected based on the updated radio wave map, after the radio wave map is updated, connection destination switching may occur continuously even if the change in communication status is only temporary and switching the connection destination is not actually necessary. In this case, there is a problem in that unnecessary communication downtime increases.

[0006] This disclosure has been made in view of the above, and aims to provide a surrounding environment evaluation device that can reduce unnecessary communication downtime. [Means for solving the problem]

[0007] To solve the above-mentioned problems and achieve the objective, the surrounding environment evaluation device according to this disclosure is characterized by comprising: an information acquisition unit that acquires location information of a mobile terminal mounted on a mobile body and performing wireless communication while moving, surrounding environment information indicating the surrounding environment of the mobile terminal, connection destination information of the mobile terminal, radio wave strength information indicating the radio wave strength received by the mobile terminal, and radio wave arrival direction information indicating the direction from which the radio waves received by the mobile terminal are coming; a surrounding environment evaluation unit that evaluates whether the change in the surrounding environment of the mobile terminal is temporary based on the information acquired by the information acquisition unit, and determines whether or not to update the spot cell connection map indicating the radio wave environment of candidate connection destinations for the mobile terminal for each location of the mobile terminal based on the evaluation result; and a data transmission / reception unit that transmits the updated spot cell connection map, or the determination result, based on the determination result of whether or not to update the spot cell connection map, to a database that stores the spot cell connection map. [Effects of the Invention]

[0008] According to this disclosure, it will be possible to reduce unnecessary communication downtime. [Brief explanation of the drawing]

[0009] [Figure 1] Figure showing a configuration example of a peripheral environment evaluation system [Figure 2] Figure showing a functional configuration example of a peripheral environment evaluation device [Figure 3] Explanatory diagram of an example of a method for determining an input value [Figure 4] Figure showing dedicated hardware for realizing the functions of a peripheral environment evaluation device [Figure 5] Figure showing the configuration of a control circuit for realizing the functions of a peripheral environment evaluation device [Figure 6] Sequence diagram for explaining the operation of a peripheral environment evaluation system according to Embodiment 1 [Figure 7] Figure showing an example of a spot cell connection map [Figure 8] Figure showing a calculation example of an input value for each direction from a mobile terminal [Figure 9] Figure showing a calculation example of a weight for each direction from a mobile terminal [Figure 10] Figure showing a calculation example of an output value for each direction from a mobile terminal [Figure 11] Sequence diagram for explaining the operation of a peripheral environment evaluation system according to Embodiment 2

Modes for Carrying Out the Invention

[0010] Hereinafter, a peripheral environment evaluation device, a peripheral environment evaluation program, and a peripheral environment evaluation method according to embodiments of the present disclosure will be described in detail based on the drawings.

[0011] Embodiment 1. Figure 1 shows an example configuration of the surrounding environment evaluation system 1. Examples of applications for the surrounding environment evaluation system 1 include mobile communication systems such as inter-vehicle communication systems utilizing public 5G and local 5G in the railway sector, communication systems for automobiles such as V2X systems, communication systems for drones, and communication systems for pedestrians. Furthermore, the surrounding environment evaluation system 1 may be applied not only to communication systems that combine public 5G with a wide coverage area and local 5G with spot cells, but also to communication systems that combine public Sub6 with a wide coverage area and millimeter-wave public 5G with spot cells.

[0012] The surrounding environment evaluation system 1 comprises a surrounding environment evaluation device 100, a surrounding environment measuring device 200, a mobile terminal 300, a location acquisition device 400, and a database 500. Here, the mobile entity is a train formation 900, and the surrounding environment measuring device 200 measures the surrounding environment 800 of the mobile terminal 300, the mobile terminal 300 moves along with the movement of the train formation 900 and communicates wirelessly, and the location acquisition device 400 acquires the location information of the mobile terminal 300 are mounted on the train formation 900. The surrounding environment evaluation device 100 acquires information from the surrounding environment measuring device 200, the mobile terminal 300, and the location acquisition device 400, and sends and receives data with the database 500. The mobile terminal 300 communicates wirelessly with the base station 700. The surrounding environment evaluation device 100 also holds design information 600, which is information related to the design of the wireless communication system including the mobile terminal 300 and the base station 700. The design information 600 includes mobile information indicating the characteristics of the mobile train formation 900, antenna pattern information, antenna installation location information indicating the location where the mobile terminal 300's antenna is installed within the train formation 900, and base station location information indicating the location where the base station 700 is installed. The surrounding environment measuring device 200 measures the surrounding environment 800 around the mobile terminal 300.

[0013] The surrounding environment measurement device 200 is, for example, a camera that acquires video information as a measurement result of the surrounding environment 800, or a LiDAR device that acquires LiDAR (Light Detection And Ranging) data as a measurement result of the surrounding environment 800. In Figure 1, one surrounding environment measurement device 200 is shown for one train set 900, but multiple surrounding environment measurement devices 200 may be installed for one train set 900.

[0014] The location acquisition device 400 acquires location information of the mobile terminal 300. The location information acquired here can be any information that can identify the location, and may be GNSS (Global Navigation Satellite System) information or kilometer information.

[0015] The database 500 stores the spot cell connection map. The spot cell connection map is information indicating the radio wave environment of candidate destinations for connection to the mobile terminal 300 at each location of the mobile terminal 300. The database 500 can provide the stored spot cell connection map to the surrounding environment evaluation device 100. When updating the spot cell connection map, the surrounding environment evaluation device 100 may update the spot cell connection map and store the updated spot cell connection map in the database 500, or the database 500 may update the spot cell connection map upon instruction from the surrounding environment evaluation device 100. In the following explanation, the database 500 will be described as performing the update of the spot cell connection map.

[0016] Figure 2 shows an example of the functional configuration of the surrounding environment evaluation device 100. The surrounding environment evaluation device 100 includes an information acquisition unit 101, a surrounding environment evaluation unit 102, a data transmission / reception unit 103, and a storage unit 104.

[0017] The information acquisition unit 101 connects to external devices: a surrounding environment measuring device 200, a mobile terminal 300, and a location acquisition device 400. The information acquisition unit 101 acquires surrounding environment information from the surrounding environment measuring device 200. The surrounding environment information is information indicating the surrounding environment 800 of the mobile terminal 300. The information acquisition unit 101 acquires network information, received power information, and radio wave direction information from the mobile terminal 300. The network information is information indicating the network to which the mobile terminal 300 is connected. The received power information is information indicating the strength of the power received by the mobile terminal 300 from the base station 700. The radio wave direction information is information indicating the direction of arrival of the radio waves received by the mobile terminal 300 from the base station 700. The information acquisition unit 101 acquires location information and time information of the mobile terminal 300 from the location acquisition device 400. The time information is information indicating the date and time on which the location information was acquired. The information acquisition unit 101 outputs the information acquired from the external device to the surrounding environment evaluation unit 102.

[0018] The surrounding environment evaluation unit 102 uses the information acquired by the information acquisition unit 101 and the information stored in the storage unit 104, such as past measurement results of the surrounding environment 800, to detect changes in the surrounding environment 800, evaluate whether the detected change is temporary, and determine whether to update the spot cell connection map based on the evaluation result. The surrounding environment evaluation unit 102 determines not to update the spot cell connection map if the change in the surrounding environment 800 is temporary, and determines to update the spot cell connection map if the change in the surrounding environment 800 is permanent. Examples of temporary changes in the surrounding environment 800 include the installation of construction fences, plant growth, and temporary vehicle stops. Permanent changes in the surrounding environment 800 do not necessarily refer to irreversible changes, but rather to changes that last for a longer period compared to the temporary changes described above. For example, permanent changes in the surrounding environment 800 include the construction and demolition of buildings, houses, bridges, and other structures.

[0019] The surrounding environment evaluation unit 102 can detect changes in the surrounding environment 800 by comparing the surrounding environment information included in the information acquired by the information acquisition unit 101 with past surrounding environment information stored in the storage unit 104.

[0020] Whether a change in the surrounding environment 800 is temporary or not can be determined based on the measurement results of the surrounding environment measuring device 200. For example, consider the case where the surrounding environment measuring device 200 outputs video information and the results of object recognition by image analysis of the video information as measurement results of the surrounding environment 800. The surrounding environment evaluation unit 102 can grasp the increase or decrease of objects in the video by comparing the measurement results of the surrounding environment 800 acquired by the information acquisition unit 101 with the measurement results of the surrounding environment 800 held in the storage unit 104. Furthermore, the surrounding environment evaluation unit 102 can determine whether a change in the surrounding environment 800 is permanent or not based on the type of object indicated by the recognition results of the increased or decreased objects. For example, the surrounding environment evaluation unit 102 can determine that the change is permanent if the increased or decreased object is a building. Also, the surrounding environment evaluation unit 102 can determine that the change is temporary if the increased or decreased object is something movable such as a car, or if the size of the object changes due to growth or pruning such as a plant. In this example, the surrounding environment measurement device 200 performs image analysis, but the surrounding environment evaluation unit 102 may also perform image analysis using the video information output by the surrounding environment measurement device 200.

[0021] Furthermore, the surrounding environment evaluation unit 102 can evaluate whether the change in the surrounding environment 800 is temporary or not, using an evaluation value E obtained by evaluating the amount of change in the surrounding environment 800 of the mobile terminal 300 and the impact of the change in the surrounding environment 800 on the communication of the mobile terminal 300. Based on the calculated evaluation value E, the surrounding environment evaluation unit 102 determines whether or not to update the spot cell connection map.

[0022] Here, an example of the evaluation value E will be explained. The surrounding environment evaluation unit 102 calculates an input value X that evaluates the amount of change in the surrounding environment 800 for each orientation from the mobile terminal 300. In the following, "orientation from the mobile terminal 300" is expressed as the elevation angle θ and the azimuth angle φ. The input value X is calculated based on the measurement results of the surrounding environment 800 obtained from the surrounding environment measuring device 200 and past measurement results of the surrounding environment 800 stored in the storage unit 104. The input value X can be a value from 0 to 1 depending on the amount of change in the surrounding environment 800. Here, the input value X is set to a larger value the greater the amount of change in the surrounding environment 800.

[0023] An example of how to determine the input value X is described below. The input value X can be determined from the image analysis results of the surrounding environment measuring device 200, based on whether or not there is a change in the surrounding environment 800 in eight adjacent blocks for each block in which changes in elevation angle θ and azimuth angle φ were detected.

[0024] Figure 3 is an explanatory diagram illustrating an example of how the input value X is determined. In Figure 3, for each block corresponding to elevation angle θ and azimuth angle φ, the presence or absence of a change in the surrounding environment 800 is indicated by a circle (○). Blocks marked with a circle (○) indicate that there has been a change in the surrounding environment 800. To identify each block, the blocks corresponding to elevation angle θ and azimuth angle φ are numbered from 1 to 6. Here, for the sake of explanation, the block with elevation angle θ of "1" and azimuth angle φ of "2" is represented as block (1,2). In the example in Figure 3, blocks (3,2), (4,2), (5,2), (3,3), (4,3), (5,3), (3,4), (4,4), and (5,4) are the blocks where there has been a change in the surrounding environment 800.

[0025] Also, for the sake of explanation, the input value X corresponding to each block for each elevation angle θ and azimuth angle φ is input value X θ,φ For example, the input value X corresponding to block (4,3) is input value X 4,3 Let's assume that.

[0026] For example, if there are changes in all eight adjacent blocks, the input value X is set to "1". If there are changes in only some of the adjacent blocks, the input value X can be set step by step within the range of 0 to 1 according to the number of blocks with changes. The eight adjacent blocks refer to the eight surrounding blocks centered on the target block. For example, for the block (4, 3), the eight adjacent blocks are the block (3, 2), the block (4, 2), the block (5, 2), the block (3, 3), the block (5, 3), the block (3, 4), the block (4, 4), and the block (5, 4).

[0027] For example, among the eight blocks adjacent to the target block, if the number of blocks with changes in the surrounding environment 800 is eight, the input value X θ,φ = 1; if the number is seven, the input value X θ,φ = 8 / 9; if the number is six, X θ,φ = 7 / 9; if the number is five, X θ,φ = 6 / 9; if the number is four, X θ,φ = 5 / 9; if the number is three, X θ,φ = 4 / 9; if the number is two, X θ,φ = 3 / 9; if the number is one, X θ,φ = 2 / 9; if the number is zero, X θ,φ = 1 / 9.

[0028] In this case, in the example of Figure 3, since there are changes in the surrounding environment 800 in all eight adjacent blocks of the block (4, 3), the input value X 4,3 = 1. For the blocks (3, 2), (5, 2), (3, 4), and (5, 4), since the number of blocks with changes in the surrounding environment 800 is three, X[[ID=二十九]] 3,2 = X 5,2 = X 3,4 = X 5,4 = 4 / 9. For the blocks (4, 2), (3, 3), (3, 5), and (4, 4), since the number of blocks with changes in the surrounding environment 800 is five, X 4,2 = X 3,3 = X 3,5 = X 4,4This results in 6 / 9. Note that the method of setting the input value X shown here is just one example; it is not limited to this example, and any value corresponding to the change in the surrounding environment (800) is acceptable.

[0029] Furthermore, the surrounding environment evaluation unit 102 calculates a weight W for each direction from the mobile terminal 300, evaluating the impact of changes in the surrounding environment 800 on the communication of the mobile terminal 300. The surrounding environment evaluation unit 102 calculates the weight W such that the greater the impact of changes in the surrounding environment 800 on the communication of the mobile terminal 300, the larger the value. The surrounding environment evaluation unit 102 can calculate the weight W based on the location information, connection destination information, radio wave strength information, radio wave arrival direction information, etc., of the mobile terminal 300 acquired by the information acquisition unit 101. The weight W can be a value between 0 and 1.

[0030] The weight W can be calculated by multiplying the gain of the antenna pattern, the location information of the mobile terminal 300, and the base station direction, radio wave strength information, and radio wave arrival direction information, which are determined from the installation location information of the base station 700, and normalizing the result so that it is a value between 0 and 1.

[0031] The surrounding environment evaluation unit 102 calculates the output value Z by multiplying the input value X by the weight value W. When the index of the elevation angle θ is i and the index of the azimuth angle φ is j, the output value Z ij This can be expressed by the following formula (1).

[0032]

number

[0033] The surrounding environment evaluation unit 102 outputs Z values ​​for each direction from the mobile terminal 300. ij When we find this, the output value Z ij The sum of these values ​​is calculated as the evaluation value E. If the maximum value of the index i for the elevation angle θ is n and the maximum value of the index j for the azimuth angle φ is m, the evaluation value E is expressed by the following formula (2).

[0034]

number

[0035] The surrounding environment evaluation unit 102 uses the calculated evaluation value E and threshold Eth to determine whether or not to update the spot cell connection map. If it determines that an update is necessary, it outputs the determination result to the data transmission / reception unit 103.

[0036] The surrounding environment evaluation unit 102 can evaluate whether a change in the surrounding environment 800 is temporary or not based on an evaluation value E calculated from the change in the surrounding environment 800 at the same location. Since the evaluation value E reflects the amount of change in the surrounding environment 800 and the impact that the change in the surrounding environment 800 has on communication, in the case of a permanent change, the value of the evaluation value E will remain constant after the change, but in the case of a temporary change, the value of the evaluation value E will change. For example, after a change in the surrounding environment 800 has ended, such as when a vehicle finishes its stop and starts moving, the evaluation value E will decrease and fall below the threshold Eth. In this way, by calculating the evaluation value E, it is possible to determine whether a change in the surrounding environment 800 is temporary or permanent. According to the evaluation value E described above, the larger the change in the surrounding environment 800, the larger the value of the evaluation value E, and the greater the impact that the change in the surrounding environment 800 has on communication, the larger the value of the evaluation value E. The surrounding environment evaluation unit 102 decides to update the spot cell connection map if the evaluation value E is greater than the threshold Eth, and decides not to update the spot cell connection map if the evaluation value E is less than the threshold Eth. Note that when comparing with the threshold Eth, the average value of the evaluation value E averaged over each time point may be used.

[0037] When the data transmission / reception unit 103 receives a judgment result from the surrounding environment evaluation unit 102, it transmits the judgment result to the database 500. Also, when the data transmission / reception unit 103 receives a spot cell connection map from the database 500, it stores the received spot cell connection map in the storage unit 104.

[0038] The memory unit 104 stores the spot cell connection map, design information 600, and the like.

[0039] The hardware configuration of the surrounding environment evaluation device 100 will now be described. The functions of the surrounding environment evaluation device 100 are realized by a processing circuit. The processing circuit may be realized by dedicated hardware, or it may be a control circuit using a CPU (Central Processing Unit).

[0040] When the above processing circuits are implemented using dedicated hardware, they are implemented by the processing circuit 90 shown in Figure 4. Figure 4 is a diagram showing the dedicated hardware for realizing the functions of the peripheral environment evaluation device 100. The processing circuit 90 may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof.

[0041] When the above processing circuit is implemented using a control circuit with a CPU, this control circuit is, for example, a control circuit 91 with the configuration shown in Figure 5. Figure 5 is a diagram showing the configuration of a control circuit 91 for realizing the functions of the peripheral environment evaluation device 100. As shown in Figure 5, the control circuit 91 comprises a processor 92 and a memory 93. The processor 92 is a CPU, also called a central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, DSP (Digital Signal Processor), etc. The memory 93 is, for example, a non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (Registered Trademark) (Electrically EPROM), magnetic disk, flexible disk, optical disk, compact disk, minidisc, DVD (Digital Versatile Disk), etc.

[0042] When the above processing circuit is implemented by the control circuit 91, it is implemented by the processor 92 reading and executing a program corresponding to the processing of each component stored in the memory 93. The program may be provided in a state stored on a storage medium, or it may be provided via a communication channel such as the internet. The memory 93 is also used as temporary memory for each process executed by the processor 92. Furthermore, the functions of the peripheral environment evaluation device 100 may be implemented by combining multiple circuits. In this case, although the functions of the peripheral environment evaluation device 100 are shown divided into multiple functional blocks in Figure 2 for illustrative purposes, the operation performed by each circuit does not necessarily correspond to the functional blocks shown in Figure 2.

[0043] Figure 6 is a sequence diagram illustrating the operation of the surrounding environment evaluation system 1 according to Embodiment 1. The surrounding environment evaluation device 100 acquires location information and time information from a location acquisition device 400 mounted on a moving train formation 900 (step S001). The surrounding environment evaluation device 100 also acquires network information, received power information, and radio wave arrival direction information from a mobile terminal 300 (step S002). Furthermore, the surrounding environment evaluation device 100 acquires surrounding environment measurement information, which is the measurement result of the surrounding environment 800, from a surrounding environment measurement device 200 (step S003). Here, one unit each of the surrounding environment measurement device 200, mobile terminal 300, and location acquisition device 400 is shown, but there may be one unit or multiple units of these devices. Also, there are no particular restrictions on the order in which the surrounding environment evaluation device 100 acquires information from each device.

[0044] Next, the surrounding environment evaluation device 100 calculates an input value X, a weight W, an output value Z, and an evaluation value E based on the information acquired from the surrounding environment measurement device 200, the mobile terminal 300, and the position acquisition device 400, as well as the information it holds (step S004).

[0045] The surrounding environment evaluation device 100 determines whether or not to update the spot cell connection map based on the calculated evaluation value E and threshold value Eth (step S005).

[0046] If the surrounding environment evaluation device 100 determines in step S005 that the spot cell connection map should be updated, it transmits the determination result to the database 500 (step S006). Upon receiving the determination result, the database 500 updates the spot cell connection map based on the received determination result (step S007). The database 500 also transmits the updated spot cell connection map to the surrounding environment evaluation device 100 (step S008). Upon receiving the updated spot cell connection map, the surrounding environment evaluation device 100 updates the spot cell connection map stored in the storage unit 104 using the received spot cell connection map (step S009).

[0047] The process from steps S001 to S009 is repeated to update the spot cell connection map for each location. The process from steps S001 to S009 may be performed as a series of steps at the same cycle, or steps S008 and S009 may be performed at a longer cycle than the process from steps S001 to S007. If it is determined in step S005 that the spot cell connection map does not need to be updated, the process from steps S006 to S009 is omitted.

[0048] The surrounding environment evaluation device 100 may be implemented using equipment on the train formation 900, and the database 500 may be implemented using ground-based equipment, or both the surrounding environment evaluation device 100 and the database 500 may be implemented using ground-based equipment.

[0049] Figure 7 shows an example of a spot cell connection map. The spot cell connection map may include, for example, location information, time information, mobile information, surrounding environment information, 5G network information, received power information, and antenna installation location.

[0050] Location information may include information indicating the location of the mobile terminal 300 and the source of the location information. Time information is information indicating the time when information such as location information was acquired. Mobile information is information about the mobile entity, and in this case, since the mobile entity is a train formation 900, it may include information indicating the characteristics of the train formation 900, such as the railway line, direction of travel, and type of train. Surrounding environment information is information for each direction from the mobile terminal 300, and in this case, information for each elevation angle θ and azimuth angle φ.

[0051] 5G network information is information used to identify candidate 5G networks to which the mobile terminal 300 can connect, and may include, for example, PCI (Physical Cell ID), PLMN (Public Land Mobile Network), and TAC (Tracking Area Code). Received power information is information indicating the strength of the received power of each candidate to which the mobile terminal 300 can connect. Here, it is expressed as RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), RSSI (Received Signal Strength Indicator), SINR (Signal-to-Interference-plus-Noise Ratio), etc.

[0052] The antenna installation location is information indicating the position where the antenna of the mobile terminal 300 is installed on the mobile train formation 900.

[0053] When the evaluation value E exceeds the threshold Eth and the spot cell connection map is to be updated, the database 500, which has received the judgment result from the surrounding environment evaluation device 100, identifies the records that need to be updated based on the information contained in the spot cell connection map. For example, the database 500 can narrow down the records that need to be updated from the information contained in the spot cell connection map, including the location information, time information, mobile device information, and antenna installation location information of the mobile terminal 300. Subsequently, the database 500 updates the surrounding environment information, 5G network information, and received power information of the identified records. In this example, the database 500 updates the spot cell connection map, but the surrounding environment evaluation unit 102 of the surrounding environment evaluation device 100 may update the spot cell connection map stored in the storage unit 104 and send the updated spot cell connection map to the database 500. The update procedure is the same when the surrounding environment evaluation unit 102 updates the spot cell connection map as when the database 500 does.

[0054] Figure 8 shows an example of calculating the input value X for each direction from the mobile terminal 300. Figure 9 shows an example of calculating the weight W for each direction from the mobile terminal 300. Figure 10 shows an example of calculating the output value Z for each direction from the mobile terminal 300. From Figures 8 to 10, it can be seen that the output value Z is larger for directions where both the input value X and the weight W are large. The evaluation value E is the sum of the output values ​​Z shown in Figure 10.

[0055] As described above, Embodiment 1 provides a surrounding environment evaluation device 100 that includes: an information acquisition unit 101 that acquires location information of a mobile terminal 300 mounted on a moving train formation 900 and performing wireless communication while moving; surrounding environment information indicating the surrounding environment 800 of the mobile terminal 300; connection destination information of the mobile terminal 300; radio wave strength information indicating the radio wave strength received by the mobile terminal 300; and radio wave arrival direction information indicating the direction from which the radio waves received by the mobile terminal 300 are coming; a surrounding environment evaluation unit 102 that evaluates whether the change in the surrounding environment 800 of the mobile terminal 300 is temporary based on the information acquired by the information acquisition unit 101, and determines whether or not to update the spot cell connection map showing the radio wave environment of candidate connection destinations for the mobile terminal 300 for each location of the mobile terminal 300 based on the evaluation result; and a data transmission / reception unit 103 that transmits the updated spot cell connection map, or the determination result, based on the determination result of whether or not to update the spot cell connection map, to a database 500 that stores the spot cell connection map. This surrounding environment evaluation device 100 determines whether or not to update the spot cell connection map based on the evaluation result of whether or not the changes in the surrounding environment 800 are temporary. This prevents situations where connection destinations are unnecessarily switched repeatedly even though there is no actual impact on communication, thereby reducing unnecessary communication downtime.

[0056] The functions of the peripheral environment evaluation device 100 may be implemented by a dedicated hardware processing circuit 90 as shown in Figure 4, or by a control circuit 91 equipped with a processor 92 and memory 93 as shown in Figure 5. When the functions of the peripheral environment evaluation device 100 are implemented by the control circuit 91, a peripheral environment evaluation program executed by the processor 92 can be provided. This surrounding environment evaluation program causes the computer to function as an information acquisition unit 101 that acquires location information of a mobile terminal 300 mounted on a moving train formation 900 that communicates wirelessly while moving, surrounding environment information indicating the surrounding environment 800 of the mobile terminal 300, connection destination information of the mobile terminal 300, radio wave strength information indicating the radio wave strength received by the mobile terminal 300, and radio wave arrival direction information indicating the direction from which the radio waves received by the mobile terminal 300 are coming; a surrounding environment evaluation unit 102 that evaluates whether the change in the surrounding environment 800 of the mobile terminal 300 is temporary based on the information acquired by the information acquisition unit 101, and determines whether or not to update the spot cell connection map showing the radio wave environment of candidate connection destinations for the mobile terminal 300 for each location of the mobile terminal 300 based on the evaluation result; and a data transmission / reception unit 103 that transmits the updated spot cell connection map, or the determination result, based on the determination result of whether or not to update the spot cell connection map, to a database 500 that stores the spot cell connection map.

[0057] In Embodiment 1, the above-mentioned surrounding environment information is surrounding environment measurement information, which is the measurement result of the surrounding environment 800. In Embodiment 1, the surrounding environment evaluation unit 102 calculates an input value X that evaluates the amount of change in the surrounding environment 800 based on the latest measurement result of the surrounding environment 800 acquired by the information acquisition unit 101 and past measurement results of the surrounding environment 800 acquired by the information acquisition unit 101 in the past, for each direction from the mobile terminal 300. For each direction from the mobile terminal 300, the unit calculates a weight W that evaluates the impact of the change in the surrounding environment 800 on the communication of the mobile terminal 300 based on the connection destination information, radio wave strength information, and radio wave arrival direction information. For each direction from the mobile terminal 300, the unit calculates an output value Z by multiplying the input value X by the weight W, and the sum of the output values ​​Z is taken as the evaluation value E. Based on the evaluation value E, the surrounding environment evaluation unit 102 can evaluate whether or not the change in the surrounding environment 800 is temporary. Furthermore, the surrounding environment evaluation unit 102 may evaluate whether the changes in the surrounding environment 800 are temporary or not based on the object recognition results using video information captured of the surrounding environment 800 of the mobile terminal 300.

[0058] Here, the "orientation from the mobile terminal 300" is specifically determined by the azimuth angle φ and the elevation angle θ.

[0059] Furthermore, the spot cell connection map may be updated using the surrounding environment evaluation device 100 or the database 500. When updating the spot cell connection map, the records to be updated from among the records included in the spot cell connection map can be narrowed down based on location information, time information, mobile information indicating the characteristics of the mobile object, and antenna installation location information indicating the antenna installation location of the mobile terminal 300 on the mobile object, and the spot cell connection map can be updated based on the determination result.

[0060] Furthermore, according to Embodiment 1, a method for evaluating the surrounding environment is also provided, which includes the steps of: acquiring location information of a mobile terminal 300 mounted on a mobile body and performing wireless communication while moving; surrounding environment information indicating the surrounding environment 800 of the mobile terminal 300; connection destination information of the mobile terminal 300; radio wave strength information indicating the radio wave strength received by the mobile terminal 300; and radio wave direction information indicating the direction from which the radio waves received by the mobile terminal 300 are coming; determining whether or not to update a spot cell connection map indicating the radio wave environment of candidate connection destinations for the mobile terminal 300 for each location of the mobile terminal 300, based on an evaluation value E obtained by evaluating the amount of change in the surrounding environment 800 of the mobile terminal 300 and the impact of the change in the surrounding environment 800 on the communication of the mobile terminal 300, based on the information acquired in the acquisition step above; and transmitting the updated spot cell connection map, or the determination result, based on the determination result of whether or not to update the spot cell connection map, to a database 500 that stores the spot cell connection map.

[0061] Embodiment 2. In Embodiment 1, the surrounding environment evaluation device 100 acquired surrounding environment measurement information, which is the measurement result of the surrounding environment 800, from the surrounding environment measuring device 200. In Embodiment 2, the surrounding environment evaluation device 100 acquires an input value X from the surrounding environment measuring device 200 instead of surrounding environment measurement information. In this case, the surrounding environment measuring device 200 has past measurement results of the surrounding environment 800 and calculates the input value X based on the latest measurement result of the surrounding environment 800 and the past measurement results.

[0062] In Embodiment 2, the configuration of the surrounding environment evaluation system 1 and the surrounding environment evaluation device 100 are the same as in Embodiment 1. Therefore, a detailed explanation will be omitted here, and the differences from Embodiment 1 will be mainly described.

[0063] Figure 11 is a sequence diagram illustrating the operation of the surrounding environment evaluation system 1 according to Embodiment 2. Steps S001 and S002 are the same as in Embodiment 1 shown in Figure 6. In Embodiment 1, the surrounding environment measuring device 200 transmitted surrounding environment measurement information to the surrounding environment evaluation device 100 in step S003, but in Embodiment 2, the surrounding environment measuring device 200 transmits an input value X instead of surrounding environment measurement information (step S103).

[0064] Furthermore, in Embodiment 1, the surrounding environment evaluation device 100 calculated the input value X, the weight W, the output value Z, and the evaluation value E in step S004. In contrast, in Embodiment 2, since the input value X is obtained from the surrounding environment measuring device 200, the calculation of the input value X is omitted, and the surrounding environment evaluation device 100 calculates the weight W, the output value Z, and the evaluation value E (step S104). The processing from steps S005 to S009 thereafter is the same as in Embodiment 1.

[0065] As described above, in Embodiment 2, as in Embodiment 1, a surrounding environment evaluation device 100, a surrounding environment evaluation program, and a surrounding environment evaluation method can be provided. In Embodiment 2, the information acquisition unit 101 acquires input values ​​X as surrounding environment information, which evaluate the amount of change in the surrounding environment 800 for each direction from the mobile terminal 300, and calculates the evaluation value E using the acquired input values ​​X. This makes it possible to achieve the same effects as in Embodiment 1. In addition, since the calculation of the input value X is performed by the surrounding environment measuring device 200, the amount of computation in the surrounding environment evaluation device 100 can be reduced.

[0066] The configurations shown in the embodiments described above are merely examples of the content of this disclosure and can be combined with other known technologies, and parts of the configuration can be omitted or modified without departing from the gist of this disclosure.

[0067] The various aspects of this disclosure are summarized below as an appendix.

[0068] (Note 1) An information acquisition unit that acquires location information of a mobile terminal mounted on a mobile device that communicates wirelessly while moving, surrounding environment information indicating the surrounding environment of the mobile terminal, connection destination information of the mobile terminal, radio wave strength information indicating the radio wave strength received by the mobile terminal, and radio wave arrival direction information indicating the direction from which the radio waves received by the mobile terminal are coming. Based on the information acquired by the information acquisition unit, the surrounding environment evaluation unit evaluates whether the change in the surrounding environment of the mobile terminal is temporary, and based on the evaluation result, determines whether or not to update the spot cell connection map showing the radio wave environment of candidate connection destinations for the mobile terminal for each location of the mobile terminal. A data transmission / reception unit that transmits the updated spot cell connection map, or the determination result, based on the determination result, to a database storing the spot cell connection map. Equipped with A surrounding environment evaluation device characterized by the following features. (Note 2) The aforementioned surrounding environment information is the result of measurements of the surrounding environment. The surrounding environment evaluation device described in Appendix 1, characterized by the features described herein. (Note 3) The aforementioned surrounding environment evaluation unit is For each orientation from the mobile terminal, an input value is obtained that evaluates the amount of change in the surrounding environment based on the latest measurement results of the surrounding environment acquired by the information acquisition unit and past measurement results of the surrounding environment acquired by the information acquisition unit in the past. For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the connection destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value by the weight. The sum of the above output values ​​is taken as the evaluation value. Based on the aforementioned evaluation values, we evaluate whether the changes in the surrounding environment are temporary or not. The surrounding environment evaluation device described in Appendix 2, characterized by the features described herein. (Note 4) The aforementioned information acquisition unit, As the surrounding environment information, input values ​​are obtained that evaluate the amount of change in the surrounding environment for each orientation from the mobile terminal. The aforementioned surrounding environment evaluation unit is For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the location information, the destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value acquired by the information acquisition unit by the weight. The sum of the above output values ​​is taken as the evaluation value. Based on the aforementioned evaluation values, we evaluate whether the changes in the surrounding environment are temporary or not. The surrounding environment evaluation device described in Appendix 1, characterized by the features described herein. (Note 5) The orientation from the aforementioned mobile terminal is determined by the azimuth angle and elevation angle. A surrounding environment evaluation device according to any one of the appendices 1 to 4, characterized by the above. (Note 6) The surrounding environment evaluation unit narrows down the records to be updated from among the records included in the spot cell connection map based on the location information, time information, mobile information indicating the characteristics of the mobile object, and antenna installation location information indicating the antenna installation location of the mobile object terminal on the mobile object, and updates the spot cell connection map based on the determination result. A surrounding environment evaluation device according to any one of the appendices 1 to 5, characterized by the above. (Note 7) The surrounding environment evaluation unit evaluates whether the changes in the surrounding environment are temporary or not, based on the object recognition results using video information captured of the surrounding environment of the mobile terminal. A surrounding environment evaluation device according to any one of the appendices 1 to 6, characterized by the above. (Note 8) Computers, An information acquisition unit that acquires location information of a mobile terminal mounted on a mobile device that communicates wirelessly while moving, surrounding environment information indicating the surrounding environment of the mobile terminal, connection destination information of the mobile terminal, radio wave strength information indicating the radio wave strength received by the mobile terminal, and radio wave arrival direction information indicating the direction from which the radio waves received by the mobile terminal are coming. Based on the information acquired by the information acquisition unit, the surrounding environment evaluation unit evaluates whether the change in the surrounding environment of the mobile terminal is temporary, and based on the evaluation result, determines whether or not to update the spot cell connection map showing the radio wave environment of candidate connection destinations for the mobile terminal for each location of the mobile terminal. A data transmission / reception unit that transmits the updated spot cell connection map, or the determination result, based on the determination result, to a database storing the spot cell connection map. A surrounding environment evaluation program characterized by functioning as a surrounding environment evaluation device equipped with the necessary components. (Note 9) The aforementioned surrounding environment information is the result of measurements of the surrounding environment. The surrounding environment evaluation program described in Appendix 8, characterized by the above. (Note 10) The aforementioned surrounding environment evaluation unit is For each orientation from the mobile terminal, an input value is obtained that evaluates the amount of change in the surrounding environment based on the latest measurement results of the surrounding environment acquired by the information acquisition unit and past measurement results of the surrounding environment acquired by the information acquisition unit in the past. For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the connection destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value by the weight. The sum of the above output values ​​is taken as the evaluation value. Based on the aforementioned evaluation values, we evaluate whether the changes in the surrounding environment are temporary or not. The surrounding environment evaluation program described in Appendix 9, characterized by the features described herein. (Note 11) The aforementioned information acquisition unit, As the surrounding environment information, input values ​​are obtained that evaluate the amount of change in the surrounding environment for each orientation from the mobile terminal. The aforementioned surrounding environment evaluation unit is For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the location information, the destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value acquired by the information acquisition unit by the weight. The sum of the above output values ​​is taken as the evaluation value. Based on the aforementioned evaluation values, we evaluate whether the changes in the surrounding environment are temporary or not. The surrounding environment evaluation program described in Appendix 8, characterized by the above. (Note 12) The orientation from the aforementioned mobile terminal is determined by the azimuth angle and elevation angle. A surrounding environment assessment program as described in any one of appendices 8 to 11, characterized by the above. (Note 13) The surrounding environment evaluation unit narrows down the records to be updated from among the records included in the spot cell connection map based on the location information, time information, mobile information indicating the characteristics of the mobile object, and antenna installation location information indicating the antenna installation location of the mobile object terminal on the mobile object, and updates the spot cell connection map based on the determination result. A surrounding environment evaluation program as described in any one of appendices 8 to 12, characterized by the above. (Note 14) The surrounding environment evaluation unit evaluates whether the changes in the surrounding environment are temporary or not, based on the object recognition results using video information captured of the surrounding environment of the mobile terminal. A surrounding environment assessment program as described in any one of appendices 8 to 13, characterized by the above. (Note 15) The steps include obtaining location information of a mobile terminal mounted on a mobile device that communicates wirelessly while moving, surrounding environment information indicating the surrounding environment of the mobile terminal, connection destination information of the mobile terminal, radio wave strength information indicating the radio wave strength received by the mobile terminal, and radio wave arrival direction information indicating the direction from which the radio waves received by the mobile terminal are coming. Based on the information acquired in the aforementioned acquisition step, the step includes evaluating whether the change in the surrounding environment of the mobile terminal is temporary, and determining whether to update the spot cell connection map showing the radio wave environment of candidate destinations for the mobile terminal for each location of the mobile terminal, based on the evaluation result. The steps include sending the updated spot cell connection map, or the determination result, based on the determination result, to a database that stores the spot cell connection map, including A method for evaluating the surrounding environment characterized by the following features. (Note 16) The aforementioned surrounding environment information is the result of measurements of the surrounding environment. The surrounding environment evaluation method described in Appendix 15, characterized by the features described herein. (Note 17) Steps to calculate the evaluation value, It further includes, In the step of calculating the aforementioned evaluation value, For each orientation from the mobile terminal, an input value is obtained that evaluates the amount of change in the surrounding environment based on the latest measurement results of the surrounding environment and past measurement results of the surrounding environment. For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the connection destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value by the weight. The sum of the output values ​​is defined as the evaluation value. In the determination step described above, the evaluation value is used to determine whether the change in the surrounding environment is temporary or not. The surrounding environment evaluation method described in Appendix 16, characterized by the features described herein. (Note 18) In the aforementioned acquisition step, As the surrounding environment information, input values ​​are obtained that evaluate the amount of change in the surrounding environment for each orientation from the mobile terminal. Steps to calculate the evaluation value, It further includes, In the step of calculating the aforementioned evaluation value, For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the location information, the destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value by the weight. The sum of the output values ​​is defined as the evaluation value. Based on the aforementioned evaluation values, we evaluate whether the changes in the surrounding environment are temporary or not. The surrounding environment evaluation method described in Appendix 15, characterized by the features described herein. (Note 19) The orientation from the aforementioned mobile terminal is determined by the azimuth angle and elevation angle. A method for evaluating the surrounding environment as described in any one of appendices 15 to 18, characterized by the features described herein. (Note 20) A step of narrowing down the records to be updated from the records included in the spot cell connection map based on the location information, time information, mobile information indicating the characteristics of the mobile body, and antenna installation location information indicating the antenna installation location of the mobile terminal on the mobile body. The steps include updating the spot cell connection map based on the determination result, Includes A method for evaluating the surrounding environment as described in any one of the appendices 15 to 19, characterized by the features described herein. (Note 21) In the determination step described above, the object recognition result using video information captured of the surrounding environment of the mobile terminal is used to evaluate whether the change in the surrounding environment is temporary or not. A method for evaluating the surrounding environment as described in any one of the appendices 15 to 20, characterized by the above. [Explanation of Symbols]

[0069] 1 Surrounding environment evaluation system, 90 Processing circuit, 91 Control circuit, 92 Processor, 93 Memory, 100 Surrounding environment evaluation device, 101 Information acquisition unit, 102 Surrounding environment evaluation unit, 103 Data transmission / reception unit, 104 Storage unit, 200 Surrounding environment measurement device, 300 Mobile terminal, 400 Location acquisition device, 500 Database, 600 Design information, 700 Base station, 800 Surrounding environment, 900 Train formation, E Evaluation value, Eth Threshold, i,j Index, W Weight, X Input value, Z,Z ij Output value, θ elevation angle, φ azimuth angle.

Claims

1. An information acquisition unit that acquires location information of a mobile terminal mounted on a mobile device that communicates wirelessly while moving, surrounding environment information indicating the surrounding environment of the mobile terminal, connection destination information of the mobile terminal, radio wave strength information indicating the radio wave strength received by the mobile terminal, and radio wave arrival direction information indicating the direction from which the radio waves received by the mobile terminal are coming. Based on the information acquired by the information acquisition unit, the surrounding environment evaluation unit evaluates whether the change in the surrounding environment of the mobile terminal is temporary, and based on the evaluation result, determines whether or not to update the spot cell connection map showing the radio wave environment of candidate connection destinations for the mobile terminal for each location of the mobile terminal. A data transmission / reception unit that transmits the updated spot cell connection map, or the determination result, based on the determination result, to a database storing the spot cell connection map. Equipped with A surrounding environment evaluation device characterized by the following features.

2. The aforementioned surrounding environment information is the result of measurements of the surrounding environment. The surrounding environment evaluation device according to feature 1.

3. The aforementioned surrounding environment evaluation unit is For each orientation from the mobile terminal, an input value is obtained that evaluates the amount of change in the surrounding environment based on the latest measurement results of the surrounding environment acquired by the information acquisition unit and past measurement results of the surrounding environment acquired by the information acquisition unit in the past. For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the connection destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value by the weight. The sum of the above output values ​​is taken as the evaluation value. Based on the aforementioned evaluation values, we evaluate whether the changes in the surrounding environment are temporary or not. The surrounding environment evaluation device according to feature 2.

4. The aforementioned information acquisition unit, As the surrounding environment information, input values ​​are obtained that evaluate the amount of change in the surrounding environment for each orientation from the mobile terminal. The aforementioned surrounding environment evaluation unit is For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the location information, the destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value acquired by the information acquisition unit by the weight. The sum of the above output values ​​is taken as the evaluation value. Based on the aforementioned evaluation values, we evaluate whether the changes in the surrounding environment are temporary or not. The surrounding environment evaluation device according to feature 1.

5. The orientation from the aforementioned mobile terminal is determined by the azimuth angle and elevation angle. The surrounding environment evaluation device according to feature 1.

6. The surrounding environment evaluation unit narrows down the records to be updated from among the records included in the spot cell connection map based on the location information, time information, mobile information indicating the characteristics of the mobile object, and antenna installation location information indicating the antenna installation location of the mobile object terminal on the mobile object, and updates the spot cell connection map based on the determination result. The surrounding environment evaluation device according to feature 1.

7. The surrounding environment evaluation unit evaluates whether the changes in the surrounding environment are temporary or not, based on the object recognition results using video information captured of the surrounding environment of the mobile terminal. The surrounding environment evaluation device according to feature 1.

8. Computers, An information acquisition unit that acquires location information of a mobile terminal mounted on a mobile device that communicates wirelessly while moving, surrounding environment information indicating the surrounding environment of the mobile terminal, connection destination information of the mobile terminal, radio wave strength information indicating the radio wave strength received by the mobile terminal, and radio wave arrival direction information indicating the direction from which the radio waves received by the mobile terminal are coming. Based on the information acquired by the information acquisition unit, the surrounding environment evaluation unit evaluates whether the change in the surrounding environment of the mobile terminal is temporary, and based on the evaluation result, determines whether or not to update the spot cell connection map showing the radio wave environment of candidate connection destinations for the mobile terminal for each location of the mobile terminal. A data transmission / reception unit that transmits the updated spot cell connection map, or the determination result, based on the determination result, to a database storing the spot cell connection map. A surrounding environment evaluation program characterized by functioning as a surrounding environment evaluation device equipped with the necessary components.

9. The aforementioned surrounding environment information is the result of measurements of the surrounding environment. The surrounding environment evaluation program according to feature 8.

10. The aforementioned surrounding environment evaluation unit is For each orientation from the mobile terminal, an input value is obtained that evaluates the amount of change in the surrounding environment based on the latest measurement results of the surrounding environment acquired by the information acquisition unit and past measurement results of the surrounding environment acquired by the information acquisition unit in the past. For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the connection destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value by the weight. The sum of the above output values ​​is taken as the evaluation value. Based on the aforementioned evaluation values, we evaluate whether the changes in the surrounding environment are temporary or not. The surrounding environment evaluation program according to feature 9.

11. The aforementioned information acquisition unit, As the surrounding environment information, input values ​​are obtained that evaluate the amount of change in the surrounding environment for each orientation from the mobile terminal. The aforementioned surrounding environment evaluation unit is For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the location information, the destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value acquired by the information acquisition unit by the weight. The sum of the above output values ​​is taken as the evaluation value. Based on the aforementioned evaluation values, we evaluate whether the changes in the surrounding environment are temporary or not. The surrounding environment evaluation program according to feature 8.

12. The orientation from the aforementioned mobile terminal is determined by the azimuth angle and elevation angle. The surrounding environment evaluation program according to feature 8.

13. The surrounding environment evaluation unit narrows down the records to be updated from among the records included in the spot cell connection map based on the location information, time information, mobile information indicating the characteristics of the mobile object, and antenna installation location information indicating the antenna installation location of the mobile object terminal on the mobile object, and updates the spot cell connection map based on the determination result. The surrounding environment evaluation program according to feature 8.

14. The surrounding environment evaluation unit evaluates whether the changes in the surrounding environment are temporary or not, based on the object recognition results using video information captured of the surrounding environment of the mobile terminal. The surrounding environment evaluation program according to feature 8.

15. The steps include obtaining location information of a mobile terminal mounted on a mobile device that communicates wirelessly while moving, surrounding environment information indicating the surrounding environment of the mobile terminal, connection destination information of the mobile terminal, radio wave strength information indicating the radio wave strength received by the mobile terminal, and radio wave arrival direction information indicating the direction from which the radio waves received by the mobile terminal are coming. Based on the information acquired in the aforementioned acquisition step, the step includes evaluating whether the change in the surrounding environment of the mobile terminal is temporary, and determining whether to update the spot cell connection map showing the radio wave environment of candidate destinations for the mobile terminal for each location of the mobile terminal, based on the evaluation result. The steps include sending the updated spot cell connection map, or the determination result, based on the determination result, to a database that stores the spot cell connection map, including A method for evaluating the surrounding environment characterized by the following features.

16. The aforementioned surrounding environment information is the result of measurements of the surrounding environment. The surrounding environment evaluation method according to feature 15.

17. Steps to calculate the evaluation value, It further includes, In the step of calculating the aforementioned evaluation value, For each orientation from the mobile terminal, an input value is obtained that evaluates the amount of change in the surrounding environment based on the latest measurement results of the surrounding environment and past measurement results of the surrounding environment. For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the connection destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value by the weight. The sum of the output values ​​is defined as the evaluation value. In the determination step described above, the evaluation value is used to determine whether the change in the surrounding environment is temporary or not. The method for evaluating the surrounding environment according to claim 16.

18. In the aforementioned acquisition step, As the surrounding environment information, input values ​​are obtained that evaluate the amount of change in the surrounding environment for each orientation from the mobile terminal. Steps to calculate the evaluation value, It further includes, In the step of calculating the aforementioned evaluation value, For each orientation from the mobile terminal, weights are calculated to evaluate the impact of changes in the surrounding environment on the communication of the mobile terminal, based on the location information, the destination information, the radio wave strength information, and the radio wave arrival direction information. For each orientation from the mobile terminal, an output value is obtained by multiplying the input value by the weight. The sum of the output values ​​is defined as the evaluation value. Based on the aforementioned evaluation values, we evaluate whether the changes in the surrounding environment are temporary or not. The surrounding environment evaluation method according to feature 15.

19. The orientation from the aforementioned mobile terminal is determined by the azimuth angle and elevation angle. The surrounding environment evaluation method according to feature 15.

20. A step of narrowing down the records to be updated from the records included in the spot cell connection map based on the location information, time information, mobile information indicating the characteristics of the mobile body, and antenna installation location information indicating the antenna installation location of the mobile terminal on the mobile body. The steps include updating the spot cell connection map based on the determination result, Includes The surrounding environment evaluation method according to feature 15.

21. In the determination step described above, the object recognition result using video information captured of the surrounding environment of the mobile terminal is used to evaluate whether the change in the surrounding environment is temporary or not. The surrounding environment evaluation method according to feature 15.

Images