Method and device for optimized time synchronization correction

Abstract

The invention discloses a method for optimizing the time synchronous correction and a device thereof, which are applied to a digital communication network. The method comprises the following steps: a synchronous protocol module acquires the current time offset value by transmitting synchronization messages via a main side and a secondary side; a judgment module compares that the symbol of the current time offset value and the symbol of the time offset value of the previous synchronization are both positive or both negative; if yes, the judgment module makes a decision that the clock slave is in the positive offset or negative offset relative to the clock master, and correspondingly determines that the follow-up correction is the negative correction or the positive correction, that is, a follow-up correction module decreases a preset interval adjustment step size value from or adds a preset interval adjustment step size value to the synchronous correction at each time of follow-up correction. The method and the device for optimizing the time synchronous correction process the time offset value and take different synchronous correction plans according to the processing result, effectively improve the synchronization precision without changing the synchronization frequency or the interval time, and have strong anti-interference capability and good versatility.

Description

technical field [0001] The invention relates to a method and device in the field of digital communication, in particular to a method and device for time synchronization in a communication network. Background technique [0002] In the prior art, the IEEE 1588 protocol, also known as the Precision Time Protocol, or PTP (Precision Time Protocol), is a network time synchronization protocol proposed by the IEEE, which can realize high-precision time synchronization. Widely used in Ethernet, communication systems, distributed system measurement and control, etc., to provide high-precision time correction and synchronization. [0003] When the IEEE1588 protocol performs time synchronization, it first sends a time synchronization message. The message is sent by the master device in the form of multicast. The synchronization message will be received. After the slave device receives the synchronization message, it can calculate the time deviation value with the master clock accordin...

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Problems solved by technology

[0019] The above-mentioned traditional synchronization method is to perform a synchronization at intervals. The time deviation of each synchronization is the accumulation of the clock frequency deviation in the interval. During this interval, the time offset itself cannot be corrected. This makes it necessary to rely on shortening the time interval to achieve the purpose of improving synchronization accuracy in some occasions that require high time accuracy; and a too short time interval will seriously increase the network load, and may even cause losses outweighing the gains.

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