公开(公告)号：US10945223B2

公开(公告)日：2021-03-09

申请号：US16076716

申请日：2017-01-18

申请人： NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY

发明人： Nobuyasu Shiga ,  Masugi Inoue ,  Satoshi Yasuda ,  Kohta Kido

IPC分类号： H04W56/00 ,  G04G7/00 ,  H04L7/00 ,  H04W84/20

摘要： The time of transmission and reception between stations A and B is exchanged, and any deviation in time is calculated in a corresponding manner in the stations. Using the transmission time TXA from station A to B, the transmission time TYB from station B to A, the time TXB of a clock at station B in a transmission from station A to station B, and the clock time TYA at station A in a transmission from station B to A, the following are measured in sequence: 1) station A records the time TXA at which TXA and TYA were transmitted, 2) station B measures the time TXB at which TXA and TYA were received, 3) station B records the time TYB at which TXB and TYB were transmitted, and 4) station A measures the time TYA at which TXB and TYB were received, the transfer time between stations A and B being derived at each station on the basis of the average of the increase ΔTXB-A from TXA to TXB and the increase ΔTYA-B from TYB to TYA, or the deviation in time for a transfer between stations A and B being determined by subtracting the increase ΔTXB-A from the transfer time. The transmission time TXA from station A to B may also be measured using a reflection signal from a transmission terminal.

公开(公告)号：US12105552B2

公开(公告)日：2024-10-01

申请号：US17919039

申请日：2021-04-14

申请人： NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY

发明人： Nobuyasu Shiga ,  Satoshi Yasuda

IPC分类号： G06F1/12

CPC分类号： G06F1/12

摘要： It is provided a synchronization system capable of managing execution of synchronization for clocks to be mounted on various devices.
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.

公开(公告)号：US11864141B2

公开(公告)日：2024-01-02

申请号：US17537139

申请日：2021-11-29

申请人： NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY

发明人： Maki Yoshida ,  Nobuyasu Shiga ,  Satoshi Yasuda ,  Kenichi Takizawa

IPC分类号： H04W56/00 ,  H04W24/10 ,  H04W24/08

CPC分类号： H04W56/0035 ,  H04W24/10 ,  H04W56/004 ,  H04W56/0055 ,  H04W24/08

摘要： In performing wireless communication between terminals to perform time difference measurement and propagation time measurement, first and second terminals that transmit a signal at least once in attempting space-time synchronization are included. The first terminal measures a reception phase of a locally transmitted signal, and a reception phase of a signal transmitted by the second terminal, adds a positive or negative phase to the measured reception phase, and makes a report to the second terminal. The second terminal measures a reception phase of a locally transmitted signal, and a reception phase of a signal transmitted by the first terminal, and makes a report to the first terminal. The first and second terminals obtain a time difference or propagation time according to a reception phase measured by a local device and reported from a counterpart, and obtain additional information based on a phase reflected in the time difference or propagation time.