Method for correcting local time and clock server

Abstract

The embodiment of the invention discloses a method for correcting local time, comprising the following steps: receiving the second clock signals sent by at least three clock sources through a clock server, obtaining the difference of the rising edge arrival time of every two second clock signals, judging whether the difference between the rising edge arrival time of one second clock signal and the rising edge arrival time of other second clock signals is larger than and equal to the prearranged threshold; and if so, correcting the local time according to the rising edge arrival time of other second clock signals. The embodiment of the invention also provides a corresponding clock server. In the embodiment of the invention, the clock source desynchronization can be discovered, and the second clock signal sent by the clock source is not used for correcting the local time, thus avoiding the desynchronization of client machines in large areas due to the desynchronization of clock source.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for correcting local time and a clock server. Background technique [0002] The third-generation network puts forward new requirements for synchronization. For example, in a network using Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time Division-Synchronous Code Division Multiple Access), high-precision communication between base station systems is required. Time synchronization, eg better than 1.5 microseconds (us). [0003] Currently, the master uses the following synchronization method: a Global Positioning System (GPS, Global Positioning System) receiver or other clock sources send a Pulse Per Second (PPS, Pulse Per Second) signal to a clock server. When the clock server receives the rising edge of the PPS signal, the clock server corrects the local time, including clearing the time below the second of the local time to 0, and adding one...

AI Technical Summary

Problems solved by technology

[0005] During the research and practice of the prior art, the inventor of the present invention found that in the prior art, each clock server obtains a PPS signal from a clock source, and when the clock source is out of sync, the clock server cannot find it and still uses The PPS signal sent by the clock source corrects the local time, thus causing a large area of ​​clients to lose synchronization

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