US 12,238,662 B2
Synchronization method and information apparatus
Shigeru Teruhi, Musashino (JP); Kento Yoshizawa, Musashino (JP); and Kazunori Akabane, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/779,946
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Dec. 2, 2019, PCT No. PCT/JP2019/046982
§ 371(c)(1), (2) Date May 25, 2022,
PCT Pub. No. WO2021/111494, PCT Pub. Date Jun. 10, 2021.
Prior Publication US 2022/0417881 A1, Dec. 29, 2022
Int. Cl. H04W 56/00 (2009.01)
CPC H04W 56/0015 (2013.01) 5 Claims
OG exemplary drawing
 
1. A synchronization method comprising:
a first step of transmitting a query command a plurality of times to a communication device configured to perform time synchronization with a base station device connected to a mobile communication network, the query command requesting time information expressed in a first period, the first period being longer than a second period of the time synchronization established by the communication device;
a second step of determining timing at which the time information is updated, the time information being obtained in response to the query command;
a third step of determining timing to transmit a next query command, based on the timing at which the time information is updated; and
a fourth step of acquiring time information with a third period that is shorter than the first period, based on time information obtained in response to the query command transmitted at the third step.