Anomaly detection electronic control unit, onboard network system, and anomaly detection method

An onboard network system, the onboard network system comprising:

• an anomaly detection processor that performs anomaly detection regarding a data frame;
• a memory;
• and
• an anomaly detection processing requester that decides an anomaly detection processing timing when receiving a data frame, the anomaly detection processing timing being a reception timing of one or multiple fields in the data frame,
• wherein the anomaly detection processor performs anomaly detection processing regarding the data frame at the anomaly detection processing timing decided by the anomaly detection processing requester, and
• wherein the onboard network system includes a plurality of electronic controllers and an anomaly detection electronic controller that communicate through a network.

An anomaly detection method used in an onboard network system including a plurality of electronic controllers that communicates via a network, the method comprising:

• performing anomaly detection processing regarding a data frame;
• and
• deciding an anomaly detection processing timing when receiving the data frame, the anomaly detection processing timing being a reception timing of one or multiple fields in the data frame,
• wherein the anomaly detection processing regarding the data frame is performed at the decided anomaly detection processing timing.