Method for handling case of detecting unauthorized frame transmitted over onboard network

1. An anomaly handling method used in a roadside device, the anomaly handling method comprising:

receiving an anomaly detection notification transmitted from a vehicle, the anomaly detection notification being issued when an unauthorized frame is detected in an onboard network installed in the vehicle,

wherein the anomaly detection notification includes (i) level information indicating one of a plurality of levels, and (ii) a location of the vehicle,

wherein the one of the plurality of levels indicated by the level information is associated with one of a plurality of predetermined anomaly handling processes, and

wherein a higher level among the plurality of levels indicates more safety is affected than other levels of the plurality of levels;

obtaining a location of the roadside device;

determining whether a distance between the location of the vehicle and the location of the roadside device is within a predetermined range or not;

when the distance is within the predetermined range and is shorter than a first predetermined distance, not changing the level information and transmitting the received anomaly detection notification externally from the roadside device;

when the distance is within the predetermined range and is longer than or equal to the first predetermined distance, changing to decrement a level indicated by the level information, and transmitting changed anomaly detection notification externally from the roadside device; and

when the distance is not within the predetermined range, not transmitting the received anomaly detection notification externally from the roadside device.

2. The anomaly handling method according to claim 1 , further comprising:

determining whether or not a predetermined condition is satisfied based on contents of the anomaly detection notification;

when the predetermined condition is determined to be satisfied, in the transmitting, transmitting the anomaly detection notification externally from the roadside device; and

when the predetermined condition is determined not to be satisfied, in the not transmitting, not transmitting the anomaly detection notification externally from the roadside device.

3. The anomaly handling method according to claim 1 , wherein

when the distance is equal to or longer than the first predetermined distance and shorter than a second predetermined distance, changing to decrement the level indicated by the level information by one level, and transmitting changed anomaly detection notification externally from the roadside device, and

when the distance is longer than the second predetermined distance and shorter than a third predetermined distance, changing to decrement the level indicated by the level information by two levels, and transmitting changed anomaly detection notification externally from the roadside device.

4. The anomaly handling method according to claim 3 , wherein

the first predetermined distance is shorter than the second predetermined distance, and

the second predetermined distance is shorter than the third predetermined distance.

5. The anomaly handling method according to claim 1 , wherein the plurality of levels includes a first level that controls the vehicle to be stopped, a second level that controls the vehicle to lower its speed, a third level to control the vehicle to be driven with a predetermined distance to another vehicle, and a fourth level that notifies a driver of the vehicle.

6. An anomaly handling method that handles unauthorized situations by performing communication among a vehicle and a roadside device, the anomaly handling method comprising:

transmitting, from the vehicle, an anomaly detection notification at a time of detecting an unauthorized frame in an onboard network installed in the vehicle, wherein the anomaly detection notification includes (i) level information indicating one of a plurality of levels, and (ii) a location of the vehicle;

receiving the anomaly detection notification from the vehicle,

wherein the one of the plurality of levels indicated by the level information is associated with one of a plurality of predetermined anomaly handling processes, and

wherein a higher level among the plurality of levels indicates more safety is affected than other levels of the plurality of levels;

obtaining a location of the roadside device;

determining whether a distance between the location of the vehicle and the location of the roadside device is within a predetermined range or not;

when the distance is within the predetermined range and is shorter than a first predetermined distance, not changing the level information and transmitting the received anomaly detection notification externally from the roadside device;

when the distance is within the predetermined range and is longer than or equal to the first predetermined distance, changing to decrement a level indicated by the level information, and transmitting changed anomaly detection notification to externally from the roadside device; and

when the distance is not within the predetermined range, not transmitting the received anomaly detection notification externally from the roadside device.

7. A roadside device, comprising:

a processor; and

a memory having a program stored therein, the program causing the processor to execute operations including:

receiving an anomaly detection notification transmitted from a vehicle, the anomaly detection notification being issued when an unauthorized frame is detected in an onboard network installed in the vehicle,

wherein the anomaly detection notification includes (i) level information indicating one of a plurality of levels, and (ii) a location of the vehicle,

wherein the one of the plurality of levels indicated by the level information is associated with one of a plurality of predetermined anomaly handling processes, and

wherein a higher level among the plurality of levels indicates more safety is affected than other levels of the plurality of levels;

obtaining a location of the roadside device;

determining whether a distance between the location of the vehicle and the location of the roadside device is within a predetermined range or not;

when the distance is within the predetermined range and is shorter than a first predetermined distance, not changing the level information and transmitting the received anomaly detection notification externally from the roadside device;

when the distance is within the predetermined range and is longer than or equal to the first predetermined distance, changing to decrement a level indicated by the level information and transmitting changed anomaly detection notification to externally from the roadside device; and

when the distance is not within the predetermined range, not transmitting the received anomaly detection notification to externally from the roadside device.