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

Claim 7:
8. A transmission cycle calculation method for calculating a transmission cycle of each message transmitted and received through a common communication line by a plurality of in-vehicle communication devices connected to the common communication line, comprising:
measuring 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 and assigning the measured delay time to the message by an in-vehicle communication device on a transmitting side of the message; and
acquiring a point in time when the message from the in-vehicle communication device on the transmitting side is received, acquiring the delay time assigned to the received message, and calculating a transmission cycle of each message based on the point in time and the delay time acquired for each of two consecutive received messages by an in-vehicle communication device on a receiving side of the message 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.