TIME SYNCHRONIZATION CLIENT, A SYSTEM AND A NON-TRANSITORY COMPUTER READABLE MEDIUM

摘要

A time synchronization client having a timer, transmits request frames to request a reference time to a server having a reference timer, and receives a reply frame of respective request frames from the server. Based on an accuracy of the timer to the reference timer and an allowable time difference therebetween, an allowable measurement period is calculated. For the respective request frames transmitted within the allowable measurement period before a current time of the timer, an estimated time difference therebetween is calculated, based on a first time of the timer when the request frame is transmitted, a second time of the reference timer when the server receives the request frame, a third time of the reference timer when the server transmits the reply frame, and a fourth time of the timer when the reply frame is received. The time of the timer is corrected based on the estimated time difference.

主权项

1. A time synchronization client comprising:
a communication unit that transmits a plurality of request frames to request a notification of a reference time to a server having a reference timer that clocks the reference time, and receives a reply frame as a reply of respective request frames from the server; a timer that clocks a time; an allowable measurement period calculation unit that calculates an allowable measurement period, based on an accuracy of the timer to the reference timer and an allowable time difference between the timer and the reference timer; an estimated time difference calculation unit that calculates an estimated time difference between the timer and the reference timer for the respective request frames transmitted within the allowable measurement period before a current time of the timer, based on a first time of the timer when the communication unit transmits the request frame, a second time of the reference timer when the server receives the request frame, a third time of the reference timer when the server transmits the reply frame, and a fourth time of the timer when the communication unit receives the reply frame; and a correction unit that corrects the time of the timer, based on the estimated time difference.