Method and apparatus for providing in-vehicle network time synchronization using redundant grandmaster

摘要

A method for providing network time synchronization using a redundant grandmaster includes sensing a loss of the grandmaster. A sync message is generated according to a sensed result. The generated sync message is transmitted through a clock master port.

主权项

1. A method for providing time synchronization in a bridge switch lined via a clock slave port with a grandmaster device, the method comprising steps of:
sensing a loss of the grandmaster device based on a message transferred via the clock slave port; generating a sync message based on an internal reference time of the bridge switch according to a sensed result; and transmitting the generated sync message through a clock master port, wherein the bridge switch waits for a sync message transmission wait time before generating the sync message if the loss is sensed, and wherein the sync message transmission wait time is determined as a sum of the time corresponding to a predetermined number of the sync message transmission cycles of the grandmaster device and a predetermined multiple of a correction field value which is a most recently received value from the grandmaster device.