US 12,105,552 B2
Synchronization system and synchronization method of clock
Nobuyasu Shiga, Tokyo (JP); and Satoshi Yasuda, Tokyo (JP)
Assigned to NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, Tokyo (JP)
Appl. No. 17/919,039
Filed by NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, Tokyo (JP)
PCT Filed Apr. 14, 2021, PCT No. PCT/JP2021/015511
§ 371(c)(1), (2) Date Oct. 14, 2022,
PCT Pub. No. WO2021/210623, PCT Pub. Date Oct. 21, 2021.
Claims priority of application No. 2020-073166 (JP), filed on Apr. 15, 2020.
Prior Publication US 2023/0195161 A1, Jun. 22, 2023
Int. Cl. G06F 1/12 (2006.01)
CPC G06F 1/12 (2013.01) 16 Claims
OG exemplary drawing
 
1. A synchronization system of clocks comprising: a leader device;
a follower device capable of establishing communication connection with the leader device; and
a server apparatus capable of establishing communication connection with the leader device and/or the follower device, the system further comprising:
a time deviation calculator configured to calculate a time deviation between the leader device and the follower device; and
a time corrector configured to correct a time in the follower device based on the calculated time deviation, wherein
the synchronization system executes the time deviation calculator and/or the time corrector when the server apparatus generates, transmits, and/or receives predetermined information,
the follower device includes
a first information transmitter configured to transmit information or a signal to the leader device,
the leader device includes
a second information transmitter configured to transmit information or a signal to the follower device, and
the time deviation calculator calculates the time deviation between the leader device and the follower device by calculating ½×((TSM−TS)−(TMS−TM)), by defining: as TM, a time at which the information or the signal is transmitted from the leader device to the follower device; as TS, a time at which the information or the signal is transmitted from the follower device to the leader device; as TMS, a time clocked by the follower device at which the follower device received the information or the signal transmitted from the leader device; and further as TSM, a time clocked by the leader device at which the leader device received the information or the signal transmitted from the follower device.