FREQUENCY SYNCHRONIZATION PRECISION MONITORING METHOD, FREQUENCY SYNCHRONIZATION PRECISION MONITORING DEVICE, COMMUNICATION METHOD AND COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a frequency synchronization precision monitoring method capable of stably monitoring frequency synchronization precision regardless of environments, and a frequency synchronization precision monitoring device.;SOLUTION: The frequency synchronization precision monitoring method includes: utilizing a time information signal transmitted/received between a master and a slave to receive, at the master, a reception time and a transmission time of the time information signal measured by a clock of the slave; comparing, at the master, a measurement in a clock of the master with a measurement in the clock of the slave regarding a specific time which is set on the basis of the time information signal; and determining, at the master, that frequency synchronization precision in the clock of the slave is deteriorated relatively to the clock of the master in the case where a differential between the measurement in the clock of the master and the measurement in the clock of the slave is equal to or more than a predetermined threshold value.;COPYRIGHT: (C)2014,JPO&INPIT