Patent ID: 11916904
Assignee: DENSO CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 9:
10. A message reception method implemented by a processor in a receiving side electronic control unit configured to receive a message and a freshness value given to the message from a transmitting side electronic control unit using a connectionless communication, the freshness value including (i) upper bits that are updated according to a preset upper update condition and (ii) lower bits that are updated according to a preset lower update condition,
the message reception method comprising:
receiving the message and the freshness value transmitted from the transmitting side electronic control unit;
comparing a received value that is the received freshness value with a freshness value list, which indicates a predetermined number of freshness values in a descending order from a reference value, which is a largest freshness value among the freshness values received by the receiving side electronic control unit to provide a verification result; and
updating the freshness value list so as to hold the received value in response to the verification result indicating that (i) the received value is not larger than the reference value and not smaller than a permissible value which is a smallest freshness value in the freshness value list, and (ii) the received value is not in the freshness value list.