Clock synchronization method and system in 1588-2008 protocol

Abstract

The invention discloses a clock synchronization method and a system in a 1588-2008 protocol. The method comprises the following steps that when a signalling message negotiation mechanism is not initiated by means of a unicast communication mode, a slave clock device receives a PTP (precision time protocol) message sent from a master clock device, acquires a message average interval field value in the PTP message, detects the state of a clock link between the slave clock device and the master clock device according to the actual interval of the PTP message, initiates a synchronization operation according to the clock link state to obtain synchronization information, and adjusts the local clock of the slave clock device according to the synchronization information. According to the invention, the slave clock device can precisely acquire the value of the average message interval field when a master clock device sends each message, precisely acquires the interval at which the master clock device sends PTP messages, completes the adjustment of the local clock according to the obtained average message interval field value, and finally realizes the effect of clock synchronization between the local clock of the slave clock device and the clock of the opposite clock of the master clock device.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and system for clock synchronization in the 1588-2008 protocol. Background technique [0002] At present, the clock synchronization and time synchronization requirements of the base station can be met by various means, including: physical clock (such as external clock input, synchronous Ethernet, etc.), packet recovery clock (such as 1588v2, etc.). Compared with traditional timing technology, IEEE1588v2 has obvious advantages. When the GPS time synchronization system with a one-way channel is used, although the synchronization signal is stable and reliable, with high precision, the price is high (equipment, installation, maintenance costs), construction is difficult (the base station is placed in the basement), and the failure rate is also high. There is a security risk. IEEE1588v2 adopts two-way channel, the precision is ns level, the cost is low, and it can ad...

AI Technical Summary

Problems solved by technology

[0012] Current IEEE Std 1588 TM - When the negotiation mechanism is not enabled for unicast communication in the 2008 standard protocol, the slave clock device cannot accurately obtain the value of the logMessageInterval (average message interval) field of each message sent by the master clock device, and thus cannot obtain the PTP in real time and accurately The sending interval of the message. In this case, the slave clock device cannot accurately complete the link quality detection and the control of the synchronization algorithm.

Therefore this will result in the clock synchronization of the local clock of the slave clock device with the peer clock of the slave clock device and the accuracy and precision of time synchronization

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