A 1588-based time synchronization method and device

Abstract

The present disclosure relates to a method and a system for time synchronization based on the 1588 standard and relates to the communications field. The method comprises: obtaining a phase difference between a system clock and a line clock by performing a detection processing on the phase difference between the system clock and the line clock; determining, at the line clock, a time difference between a rising edge corresponding to a message header flag of a 1588 message and a rising edge of a current period of the line clock; generating a 1588-message-related time stamp at the system clock; and compensating the generated time stamp by using the phase difference and the time difference to cause the time stamp to be consistent with the line clock. By compensating the 1588-message-related time stamp, the compensated time stamp is made consistent with the line clock, achieving high-accuracy time synchronization.

Description

technical field

[0001] The present invention relates to the communication field, in particular to a 1588-based time synchronization method and device. Background technique

[0002] With the continuous development of communication technology, higher requirements are put forward for the performance of time synchronization. For example, the recent requirement of using base stations to provide positioning services requires that the time accuracy be around ±200 ns. The upgraded version of Long Term Evolution (LTE) - Advanced, LTE-Advanced)'s key technology Coordinated Multipoint Joint Processing (CoMP-JP) requires the relative time accuracy between adjacent base stations to be around ±500ns; the future fifth-generation mobile communication technology (The 5th Generation MobileCommunication Technology, 5G) system may require ultra-high-precision time synchronization on the order of hundreds of ns; as another example, more distant quantum communication technology requires extremely...

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