Communication abnormality determination device, method, program, and vehicle

Abstract

To provide a communication abnormality determination device and the like that can determine a cause of a communication breakdown between a vehicle and a server at an early stage.SOLUTION: A communication abnormality determination device mounted on a vehicle that communicates with a server, includes: a detection unit that detects the occurrence of a communication breakdown between the vehicle and the server; and a determination unit that determines a cause of the communication breakdown based on the communication strength at a first position where the communication breakdown has occurred.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an apparatus for determining abnormalities such as a communication apparatus used for communication between a vehicle and a server.

Background Art

[0002] Patent Document 1 discloses a vehicle information management system that can automatically determine and notify the reason for a communication interruption when a communication interruption occurs in a communication device mounted on a vehicle. In this vehicle information management system, when a communication interruption between the vehicle and the server is detected, if the vehicle's position is within a repair shop area, it is described that the reason for the interruption is determined to be a vehicle failure.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology described in Patent Document 1, it is not possible to determine a vehicle failure unless the vehicle moves into a repair shop area. For this reason, there is a risk that the determination of the cause of the communication interruption between the vehicle and the server may be delayed.

[0005] The present disclosure has been made in view of the above problems, and an object thereof is to provide a communication abnormality determination apparatus and the like that can quickly determine the cause of a communication interruption between a vehicle and a server.

Means for Solving the Problems

[0006] To solve the above problems, one aspect of the disclosed technology is a communication abnormality determination device mounted on a vehicle that communicates with a server, the communication abnormality determination device including: a detection unit that detects that a communication interruption has occurred between the vehicle and the server; and a determination unit that determines the cause of the communication interruption based on the communication strength at a first position where the communication interruption has occurred.

Advantages of the Invention

[0007] According to the communication abnormality determination device of the present disclosure, etc., it is possible to early determine the cause of the communication interruption occurring between the vehicle and the server.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5A

Figure 5B

Modes for Carrying Out the Invention

[0009] When a communication interruption occurs between the vehicle of the present disclosure and the server, based on the information on the communication strength at the occurrence position of the communication interruption acquired in advance, the communication abnormality determination device early determines whether the cause of the communication interruption depends on the communication environment or is based on an abnormality such as a communication device. Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings.

[0010] <Embodiment> [Configuration] FIG. 1 is a diagram showing a schematic configuration of a communication system 10 including a plurality of vehicles 200 equipped with a communication abnormality determination device 230 according to an embodiment of the present disclosure. The communication system 10 illustrated in FIG. 1 includes a server 100, a plurality of vehicles 200, and a plurality of relay base stations 300.

[0011] (1) Server The server 100 is configured to be able to communicate with a plurality of vehicles 200 via a plurality of relay base stations 300. This server 100 acquires, by communication, information regarding the state of each vehicle (such as the position, speed, and traveling direction of the vehicle), information regarding the surroundings of each vehicle (such as video data and sonar values), and information regarding the communication state at the position of each vehicle (such as communication strength and presence or absence of communication interruption) from the plurality of vehicles 200. Then, the server 100 sequentially accumulates the information acquired from the plurality of vehicles 200 in a database (not shown) (for example, a digital twin or a communication quality map database), and provides the accumulated information as current or future communication environment information to the vehicles 200 that need the information. As the communication environment information to be accumulated, information on the communication strength history at each location (vehicle position) can be exemplified. In addition, the server 100 can transmit the required communication environment information and information regarding necessary communication (such as a communication interruption warning) to the plurality of vehicles 200 and the like. As the server 100, a cloud server configured on the cloud can be exemplified.

[0012] Note that the number of servers 100 constituting the communication system 10 is not limited to one, and two or more servers 100 may be provided according to a predetermined area or region.

[0013] (2) Relay Base Station The plurality of relay base stations 300 are configured (relay devices) to relay communications performed between the plurality of vehicles 200 and the server 100. The communication between the plurality of relay base stations 300 and the server 100 may be performed wirelessly or wired. Each relay base station 300 can perform wireless communication with one or more vehicles 200 existing in a communication area that is its respective communicable range. In addition, each relay base station 300 provides a cell ID (Identification), which is information for identifying itself, to the server 100 and the vehicles 200 with which it communicates.

[0014] (3) Vehicle The plurality of vehicles 200 are a mobility configured to be communicable with the server 100 via the plurality of relay base stations 300. The plurality of vehicles 200 can provide information regarding the state of their own vehicles and information regarding the surroundings of their own vehicles to the server 100. Information regarding the state of the own vehicle includes the position of the vehicle, the speed of the vehicle, and the traveling direction of the vehicle. Information regarding the surroundings of the own vehicle includes images before and after the vehicle 200 and sonar values around the vehicle 200. In addition, the plurality of vehicles 200 can receive communication environment information (communication strength) and information regarding communication (such as a warning of communication interruption) from the server 100.

[0015] FIG. 2 is an example of a functional block diagram of each vehicle 200. The vehicle 200 illustrated in FIG. 2 includes a communication unit 210, a storage unit 220, and a communication abnormality determination device 230 according to the present embodiment.

[0016] The communication unit 210 communicates with the server 100 via the relay base station 300 and transmits information regarding the state of the vehicle (such as the position, speed, and traveling direction of the vehicle) and information regarding the communication state at the position of the vehicle (such as communication strength and the presence or absence of communication interruption) to the server 100. In addition, the communication unit 210 communicates with the server 100 via the relay base station 300 and receives communication environment information (communication strength) and information regarding communication (such as a warning of communication interruption) from the server 100. The vehicle 200 communicates with the server 100 via the relay base station 300 having the current position of the vehicle as the communication area.

[0017] The storage unit 220 stores information regarding the communication state received by the communication unit 210 from the server 100 via the relay base station 300. Specifically, the storage unit 220 stores the communication strength in an area where future driving is possible, including the current position of the vehicle 200 and the planned driving route of the vehicle 200 (for example, within a radius of ○○ km from the position of the vehicle 200).

[0018] The communication abnormality determination device 230 is a configuration for determining an abnormality in a communication device (such as the communication unit 210) used for communication between the vehicle 200 and the server 100. This communication abnormality determination device 230 includes a detection unit 231, an acquisition unit 232, and a determination unit 233.

[0019] The communication abnormality determination device 230 is typically configured as an electronic control unit (ECU: Electronic Control Unit) including a processor, a memory, and an input / output interface. By the processor reading and executing a program stored in the memory, all or some of the functions performed by the detection unit 231, the acquisition unit 232, and the determination unit 233 are realized.

[0020] The detection unit 231 detects that communication interruption has occurred between the vehicle 200 and the server 100, that is, that the communication between the vehicle 200 and the relay base station 300 within the communication area has been interrupted. The occurrence of communication interruption can be determined by the vehicle 200 no longer receiving a signal from the relay base station 300 with which it was communicating. The time for determining that the signal is no longer received may be an extremely short instantaneous time or a longer first time. Further, the detection unit 231 further detects that continuous communication interruption has occurred in a state where this communication interruption state continues for a second time longer than the first time.

[0021] When the acquisition unit 232 detects the occurrence of continuous communication interruption by the detection unit 231, the acquisition unit 232 acquires from the storage unit 220 the communication strength in the area where there is a possibility of driving including the position of the vehicle 200 and the planned driving route of the vehicle 200 at the time of detection. If the communication strength of the corresponding area is not stored in the storage unit 220, the acquisition unit 232 may acquire the communication strength of the corresponding area from the server 100 via the communication unit 210.

[0022] Based on the communication strength acquired by the acquisition unit 232, the determination unit 233 determines the cause of the continuous communication interruption detected by the detection unit 231. More specifically, the determination unit 233 determines whether the occurrence of communication interruption is due to the fact that the communication strength at the vehicle position (or communication area) at the time of detection is actually weak, or due to an abnormality in at least one of the communication devices of the server 100, the vehicle 200, and the relay base station 300. Further, when the determination unit 233 determines that an abnormality in at least one of the communication devices (communication environment) of the server 100, the vehicle 200, and the relay base station 300 is the cause of the communication interruption, the determination unit 233 further specifies which communication device (communication environment) is abnormal. The abnormality determination control performed by this determination unit 233 will be described later.

[0023] [Control] With further reference to FIGS. 3, 4, 5A, and 5B, the control performed by the communication system 10 including a plurality of vehicles 200 provided with the communication abnormality determination device 230 according to the present embodiment will be described. FIG. 3 is a processing sequence for explaining the always-on communication executed between a plurality of vehicles 200 (communication abnormality determination device 230) and the server 100. FIG. 4 is a processing flowchart for explaining the abnormality determination control executed by the communication abnormality determination device 230 of each vehicle 200. FIGS. 5A and 5B are processing flowcharts for explaining the abnormal location identification control executed by the vehicle 200 that has determined that there is an abnormality and the server 100.

[0024] (1) Always-on communication Using FIG. 3, the process of always-on communication executed between a plurality of vehicles 200 and the server 100 will be described. In the process sequence illustrated in FIG. 3, the always-on communication executed between two vehicles 200 (denoted as vehicle 200A and vehicle 200B) and the server 100 is described. Note that in this sequence, the description of the relay base station 300 that relays the communication between the vehicle 200 and the server 100 is omitted.

[0025] (Step S301) The communication unit 210 of vehicle 200A transmits information regarding the communication state including the current position of vehicle 200A and the presence or absence of communication interruption at that position to the server 100.

[0026] (Step S302) The communication unit 210 of vehicle 200B transmits information regarding the communication state including the current position of vehicle 200B and the presence or absence of communication interruption at that position to the server 100.

[0027] (Step S303) The server 100 receives information regarding the communication state including the current positions of vehicle 200A and vehicle 200B and the presence or absence of communication interruption at those positions, respectively, and accumulates the received information in the database.

[0028] (Step S304) The server 100 extracts from the database the current position of vehicle 200A and communication environment information (such as communication intensity, communication interruption history, etc.) in the area where vehicle 200A may travel in the future, and transmits it to vehicle 200A. Further, the server 100 extracts from the database the current position of vehicle 200B and communication environment information (such as communication intensity, communication interruption history, etc.) in the area where vehicle 200B may travel in the future, and transmits it to vehicle 200B.

[0029] (Step S305) The communication unit 210 of vehicle 200A receives the communication environment information from the server 100 and stores the received information in the storage unit 220.

[0030] (Step S306) The communication unit 210 of vehicle 200A receives communication environment information from server 100 and stores the received information in the storage unit 220.

[0031] From step S307 onwards, the processes of steps S301 to S306 described above are repeatedly executed.

[0032] Through this constant communication, a plurality of vehicles 200 (vehicle 200A and vehicle 200B) can always hold information such as the current position of their own vehicle, the communication strength around that position, and whether there has been a communication interruption in the past, before a communication interruption occurs.

[0033] (2) Abnormality determination control Using FIG. 4, the abnormality determination control executed by the communication abnormality determination device 230 of each vehicle 200 will be described. The abnormality determination control shown in FIG. 4 is started, for example, when the detection unit 231 detects that a communication interruption has occurred between the vehicle 200 and the server 100.

[0034] (Step S401) The detection unit 231 of the communication abnormality determination device 230 determines whether it has detected the occurrence of continuous communication interruptions where the communication interruption state has continued for a predetermined time. If the detection unit 231 detects the occurrence of continuous communication interruptions (step S401, yes), the process proceeds to step S402. On the other hand, if the detection unit 231 does not detect the occurrence of continuous communication interruptions (step S401, no), the process proceeds to step S405.

[0035] (Step S402) The acquisition unit 232 of the communication abnormality determination device 230 acquires, from the storage unit 220, the communication strength (included in the communication environment information) at the position (the first position) of the vehicle 200 when continuous communication interruptions occur. When the acquisition unit 232 acquires the communication strength at the position of the vehicle 200 when continuous communication interruptions occur, the process proceeds to step S403.

[0036] (Step S403) The determination unit 233 of the communication abnormality determination device 230 determines whether the communication intensity at the position of the vehicle 200 when consecutive communication interruptions occur is strong or weak. Specifically, the determination unit 233 determines whether the communication intensity is equal to or greater than a predetermined threshold value. This determination is made to determine whether the communication interruption detected in step S401 is physically correct. Therefore, this threshold value is set to a predetermined communication intensity such that even if a communication interruption occurs, there is nothing that can be done if it is lower than this value. When the determination unit 233 determines that the communication intensity at the vehicle position when consecutive communication interruptions occur is equal to or greater than the threshold value (step S403, strong), it is predicted that the possibility of a communication interruption occurring is low, and the process proceeds to step S404. On the other hand, when the determination unit 233 determines that the communication intensity at the vehicle position when consecutive communication interruptions occur is less than the threshold value (step S403, weak), it is predicted that the possibility of a communication interruption occurring is high, and the process proceeds to step S405.

[0037] (Step S404) The determination unit 233 of the communication abnormality determination device 230 determines that there is an abnormality in at least one of the communication devices of the server 100, the vehicle 200, and the relay base station 300. When the determination unit 233 determines that there is an abnormality in the communication device, this abnormality determination control ends.

[0038] (Step S405) The determination unit 233 of the communication abnormality determination device 230 determines that there is no abnormality in any of the communication devices of the server 100, the vehicle 200, and the relay base station 300. When the determination unit 233 determines that there is no abnormality in the communication device, the process proceeds to step S401.

[0039] By this abnormality determination control, it is possible to easily determine whether the occurrence of consecutive communication interruptions is caused by a change in communication intensity depending on the communication environment or by an abnormality in at least one of the communication devices of the server 100, the vehicle 200, and the relay base station 300.

[0040] (3) Abnormality location identification control Using FIGS. 5A and 5B, the abnormal location identification control executed by the vehicle 200 and the server 100 that have determined the presence of an abnormality will be described. The process of FIG. 5A and the process of FIG. 5B are connected by connectors X and Y. The abnormal location identification control shown in FIGS. 5A and 5B starts when the communication abnormality determination device 230 determines that there is an abnormality in at least one of the communication devices of the server 100, the vehicle 200, and the relay base station 300 in the above-described abnormality determination control (step S404 in FIG. 4).

[0041] In the following description, the vehicle 200 in which an abnormality has been determined will be referred to as "vehicle 200A", and the other vehicles 200 other than vehicle 200A will be referred to as "vehicle 200B". In addition, the relay base station 300 with which the vehicle 200 was communicating when an abnormality was determined will be referred to as "relay base station 300A", and the other relay base stations 300 other than relay base station 300A will be referred to as "relay base station 300B".

[0042] (Step S501) When the determination unit 233 of the vehicle 200A determines that there is an abnormality in at least one of the communication devices of the server 100, the vehicle 200A, and the relay base station 300A, it determines whether the vehicle 200A has traveled from the position (first position) where the vehicle 200A was located to a position (second position) separated by a predetermined distance. This determination is made to determine whether the vehicle 200A has moved from the location where the communication interruption occurred to a location where the communication interruption does not occur. Therefore, the predetermined distance is preferably a straight-line distance (such as a radius) from the first position where the vehicle 200A was located. If the determination unit 233 determines that the vehicle 200A has traveled from the first position where an abnormality was determined to the second position (step S501, Yes), the process proceeds to step S502.

[0043] (Step S502) While the vehicle 200A travels from the first position where an abnormality is determined to a second position at a predetermined distance away, the determination unit 233 of the vehicle 200A determines whether the occurrence of continuous communication interruption has stopped being detected in the detection unit 231, that is, whether the communication between the vehicle 200A and the server 100 has been restored. This determination is made to recheck the communication state between the vehicle 200A and the server 100 in the relay base station 300B other than the relay base station 300A. Therefore, in addition to being the linear distance described above, this predetermined distance is preferably a distance that can at least escape from the communication area of the relay base station 300A. When the determination unit 233 determines that the communication between the vehicle 200A and the server 100 has been restored while moving from the first position to the second position (step S502, yes), the process proceeds to step S503. On the other hand, when the determination unit 233 determines that the communication between the vehicle 200A and the server 100 has not been restored while moving from the first position to the second position (step S502, no), the process proceeds to step S509.

[0044] (Step S503) The communication unit 210 of the vehicle 200A notifies the server 100 via the relay base station 300B (or the relay base station 300A) that the communication between the vehicle 200A and the server 100 has been restored while moving from the first position to the second position. When the communication restoration with the server 100 is notified by the communication unit 210, the process proceeds to step S504.

[0045] (Step S504) When the server 100 receives the notification of communication restoration from the vehicle 200A, the server 100 checks its communication environment. Specifically, the server 100 determines whether the cloud environment related to communication, such as a hardware failure of its own communication device or a software defect of an application, is operating normally. When the server 100 determines that there is no problem with the communication environment (step S504, normal), the process proceeds to step S505. On the other hand, when the server 100 determines that there is a problem with the communication environment (step S504, abnormal), the process proceeds to step S507.

[0046] (Step S505) Server 100 acquires information regarding the communication state of another vehicle 200B that has traveled the same (or an approximate) route as the route traveled by vehicle 200A from among the information regarding the communication state accumulated in the database through communication with a plurality of vehicles 200. When the server 100 acquires information regarding the communication state of another vehicle 200B on the same travel route as the travel route of vehicle 200A, the process proceeds to step S506.

[0047] (Step S506) Server 100 determines whether the communication state of the route traveled by vehicle 200A is the same as the communication state when another vehicle 200B travels the same route. Specifically, the server 100 determines whether an event in which communication is interrupted in the communication area of the relay base station 300A and communication resumes in the communication area of the relay base station 300B has occurred in vehicle 200B as well. If the server 100 determines that the communication states of the travel routes are the same for vehicle 200A and vehicle 200B (step S506, yes), the process proceeds to step S508. On the other hand, if the server 100 determines that the communication states of the travel routes are not the same for vehicle 200A and vehicle 200B (step S506, no), the process proceeds to step S509.

[0048] (Step S507) Server 100 determines that the cause of the communication interruption between vehicle 200A and server 100 is an abnormality in server 100 itself. When the server 100 identifies an abnormality in server 100 itself, the process proceeds to step S510.

[0049] (Step S508) Server 100 determines that the cause of the communication interruption between vehicle 200A and vehicle 200B and server 100 is an abnormality in relay base station 300A. When the server 100 identifies an abnormality in relay base station 300A, the process proceeds to step S511.

[0050] (Step S509) The server 100 determines that the cause of the communication interruption between the vehicle 200A and the server 100 is an abnormality in the vehicle 200A. When the abnormality of the vehicle 200A is specified by the server 100, the process proceeds to step S513.

[0051] (Step S510) The server 100 notifies the administrator of the server 100 or the like that an abnormality has occurred in the server 100. Note that the notification that an abnormality has occurred in the server 100 may be made to the vehicle 200 that communicates with the server 100. When the server 100 notifies the server administrator or the like of the abnormality of the server 100, this abnormal location specifying control ends.

[0052] (Step S511) The server 100 gives a notification for warning of communication interruption to the route where the communication interruption occurs, that is, the vehicle 200 traveling in the communication area of the relay base station 300A and the vehicle 200 that is likely to travel in the future. When the vehicle 200 traveling on and likely to travel on the route where the communication interruption occurs is notified of the communication interruption warning by the server 100, the process proceeds to step S512.

[0053] (Step S512) The server 100 accumulates information on the route where the communication interruption occurs (information on the relay base station 300A) in the database as the current communication environment information. When the information on the route where the communication interruption occurs is accumulated in the database by the server 100, this abnormal location specifying control ends.

[0054] (Step S513) The server 100 notifies the vehicle 200A that an abnormality has occurred in the vehicle 200A. This notification is made for the purpose of instructing the driver of the vehicle 200A or the like to confirm the presence or absence of a failure. When the server 100 notifies the vehicle 200A of the abnormality of the vehicle 200, this abnormal location specifying control ends.

[0055] By this abnormal location identification control, it is possible to easily determine which component among the server 100, the vehicle 200, and the relay base station 300 causes the occurrence of continuous communication interruption.

[0056] <Function and Effect> As described above, according to the communication system 10 including a plurality of vehicles 200 equipped with the communication abnormality determination device 230 according to an embodiment of the present disclosure, the vehicle 200 that communicates via the server 100 and the relay base station 300 acquires in advance from the server 100 information on the communication strength in the communication area where communication with the relay base station 300 is possible. Then, when the communication abnormality determination device 230 detects that a continuous communication interruption has occurred between the vehicle 200 and the server 100, it determines the cause of the communication interruption based on the communication strength acquired in advance for the position where the communication interruption occurred.

[0057] By this process, it is possible to easily and early determine whether the occurrence of communication interruption between the vehicle 200 and the server 100 is caused by a change in communication strength depending on the communication environment or by an abnormality in at least one of the communication devices of the server 100, the vehicle 200, and the relay base station 300.

[0058] Also, according to the communication abnormality determination device 230 according to the present embodiment, after determining that the communication device is abnormal, based on the communication state at another position (second position) where the vehicle 200 has moved a predetermined distance from the position (first position) where the communication interruption occurred, the communication device determined to be abnormal is identified.

[0059] By this process, it is possible to more specifically determine which component among the server 100, the vehicle 200, and the relay base station 300 causes the occurrence of continuous communication interruption.

[0060] As described above, one embodiment of the disclosed technology has been explained. However, the present disclosure can be regarded as not only a communication abnormality determination device, but also a system including a communication abnormality determination device and a server, a method executed by a communication abnormality determination device including a processor and a memory, a program, a computer-readable non-transitory storage medium storing the program, or a vehicle equipped with a communication abnormality determination device, and the like.

Industrial Applicability

[0061] The communication abnormality determination device and the like of the present disclosure can be used for vehicles and the like that communicate with a server via a relay base station.

Explanation of Signs

[0062] 10 Communication System 100 Server 200 Vehicle 300 Relay Base Station 210 Communication Unit 220 Storage Unit 230 Communication Abnormality Determination Device 231 Detection Unit 232 Acquisition Unit 233 Determination Unit

Claims

A communication abnormality determination device mounted on a vehicle that communicates with a server via a plurality of relay base stations, a detection unit that detects that communication interruption has occurred between the vehicle and the server; a determination unit that determines the cause of the communication interruption based on the communication intensity at a first position that is the position of the vehicle when the communication interruption occurs with the server and the communication state at a second position that is a predetermined distance away from the first position; and is provided with, the determination unit, when the communication interruption occurs, based on the communication intensity at the first position, it is determined whether the cause is an abnormality in any of the communication devices of the vehicle, the relay base station, and the server, or a change in the communication intensity that depends on the communication environment, a communication abnormality determination device that, when it is determined that the cause is an abnormality in the communication device, specifies which of the vehicle, the relay base station, and the server is abnormal based on the communication state at the second position.

2. further comprising an acquisition unit that acquires information on the communication intensity in a communication area where communication with the server is possible from the server, the determination unit determines that the communication device is abnormal when the communication intensity at the first position previously acquired by the acquisition unit from the server is equal to or greater than a predetermined threshold value. The communication abnormality determination device according to claim 1.

3. the determination unit performs determination of the cause of the occurrence of the communication interruption when the state of the communication interruption is continuously detected by the detection unit for a predetermined time. The communication abnormality determination device according to claim 2.

4. after the determination unit determines that the cause is an abnormality in the communication device, based on the communication state until the vehicle moves to a second position outside the communication area of the relay base station that relayed communication between the vehicle and the server at the first position from the first position, it is specified which of the vehicle, the relay base station, and the server is abnormal. The communication abnormality determination device according to claim 2.

5. the determination unit determines that the vehicle is abnormal when the communication between the vehicle and the server remains interrupted even while the vehicle moves to the second position. The communication abnormality determination device according to claim 4.

6. When communication between the vehicle and the server is performed while the vehicle moves to the second position, the determination unit identifies which of the vehicle, the relay base station, and the server is abnormal based on the communication state between the server and other vehicles from the first position to the second position. The communication abnormality determination device according to claim 4.

7. When the determination unit determines that the communication interruption has not occurred between the other vehicle and the server while the vehicle moves to the second position, the determination unit determines that the vehicle is abnormal. The communication abnormality determination device according to claim 6.

8. When the cause of the communication interruption that occurred at the first position is in the communication environment of the server, the determination unit determines that the vehicle is normal. The communication abnormality determination device according to claim 7.

9. When communication interruption occurs between the other vehicle and the server at the first position and communication interruption does not occur between the other vehicle and the server until the vehicle moves to the second position, the determination unit determines that the relay base station that relays communication between the vehicle and the server at the first position is abnormal. The communication abnormality determination device according to claim 6.

10. When the cause of the communication interruption that occurred at the first position is in the communication environment of the server, the determination unit determines that the relay base station is normal. The communication abnormality determination device according to claim 9.

11. A method performed by a communication abnormality determination device mounted on a vehicle that communicates with a server via a plurality of relay base stations, detecting that a communication interruption has occurred between the vehicle and the server; obtaining information on the communication strength in a communication area where communication with the server is possible from the server; when the communication strength previously obtained from the server at a first position, which is the position of the vehicle when the communication interruption occurred between the vehicle and the server, is equal to or greater than a predetermined threshold, determining that the communication device is abnormal; and when the communication strength is less than the predetermined threshold, determining that it is caused by a change in the communication strength depending on the communication environment; when it is determined that the cause is an abnormality of the communication device, identifying which of the vehicle, the relay base station, and the server is abnormal based on the communication state at a second position that is a predetermined distance away from the first position. A method including. A program executed by a computer of a communication abnormality determination device mounted on a vehicle that communicates with a server via a plurality of relay base stations, comprising: detecting that a communication interruption has occurred between the vehicle and the server; acquiring, from the server, information on a communication strength in a communication area where communication with the server is possible; when the communication strength previously acquired from the server at a first position, which is the position of the vehicle when the communication interruption occurs between the vehicle and the server, is equal to or greater than a predetermined threshold, determining that the communication device is abnormal; and when the communication strength is less than the predetermined threshold, determining that the cause is a change in the communication strength depending on the communication environment; when it is determined that the cause is an abnormality of the communication device, identifying which of the vehicle, the relay base station, and the server is abnormal based on a communication state at a second position that is a predetermined distance away from the first position. A program including the steps of:

13. A vehicle equipped with the communication abnormality determination device according to any one of claims 1 to 10.

Images