Patent ID: 11949575
Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC G  H

Claim 6:
7. An in-vehicle communication device that is connected to a common communication line together with other in-vehicle communication devices and transmits and receives a message through the communication line, comprising:
a reception unit that receives the message with a delay time from a point in time when transmission of the message to be transmitted is first attempted to the point in time when the transmission of the message is started;
a reception point acquisition unit that acquires a point in time when the reception unit receives the message;
a delay time acquisition unit that acquires the delay time assigned to the received message; and
a calculation unit that calculates a transmission cycle of each message based on a point in time acquired by the reception point acquisition unit and a delay time acquired by the delay time acquisition unit for each of two consecutive received messages and calculates a time difference between the transmission times of the two consecutive received messages in chronological order to update the transmission cycle of a subsequent message.