US 12,273,433 B2
System for time synchronization between server and IoT device
Jae Jin Lee, Sejong (KR)
Assigned to SUNG CHANG CO., LTD, Chungcheongbuk-do (KR)
Filed by SUNG CHANG CO., LTD, Chungcheongbuk-do (KR)
Filed on Sep. 21, 2022, as Appl. No. 17/949,384.
Claims priority of application No. 10-2021-0166615 (KR), filed on Nov. 29, 2021.
Prior Publication US 2023/0171082 A1, Jun. 1, 2023
Int. Cl. H04B 17/318 (2015.01); G05B 19/042 (2006.01); H04L 7/04 (2006.01); H04W 24/10 (2009.01); H04W 56/00 (2009.01); H04W 84/12 (2009.01); H04W 84/18 (2009.01)
CPC H04L 7/04 (2013.01) 3 Claims
OG exemplary drawing
 
1. A system for time synchronization between a server and an Internet-of-Things (IoT) device, comprising:
a server configured to execute first non-transitory media to broadcast a time-point synchronization signal including first absolute time point information; and
an IoT device configured to execute second non-transitory media to receive the broadcast time-point synchronization signal and calculate second absolute time point information by using the first absolute time point information included in the time-point synchronization signal, computation time information according to an internal computation operation, and transmission time information required to receive the time-point synchronization signal, wherein the IoT device is configured to calculate the computation time information according to an internal computation operation based on a real-time clock,
wherein the server is configured to receive a second time-point synchronization signal from the IoT device, calculate server computation time information according to computation time of an internal operation of the server using a real-time clock of the server, and transmit a third time-point synchronization signal to the IoT device, the third time-point synchronization signal including third absolute time point information based on the calculated server computation time.