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

Claim 0:
1. An in-vehicle communication system in which a plurality of in-vehicle communication devices connected to a common communication line transmit and receive a plurality of messages through the communication line,
wherein the in-vehicle communication device of the plurality of in-vehicle communication devices on a transmitting side of the messages includes:
a delay time measuring unit that measures a delay time from a first point in time when transmission of the message to be transmitted is first attempted to a point in time when the transmission of the message is started; and
an assigning unit that assigns the delay time measured by the delay time measuring unit to one message of the plurality of messages, and
the in-vehicle communication device of the plurality of in-vehicle communication devices on a receiving side of the plurality of messages includes:
a reception point acquisition unit that acquires a second point in time when the one message from the in-vehicle communication device on the transmitting side is received;
a delay time acquisition unit that acquires a delay time assigned to the received one message, the delay time being a difference between the first point in time and a point in time when the message is actually transmitted; and
a calculation unit that calculates a transmission cycle of the one message based on the second point in time acquired by the reception point acquisition unit and the delay time acquired by the delay time acquisition unit and calculates a time difference between the transmission times of two consecutive received messages in chronological order to update the transmission cycle of a subsequent message.