Slave node local clock frequency adjustment method based on the minimum overall error of count value

Abstract

The invention provides a slave node local clock frequency adjustment method based on the minimum overall count value error, which is used to improve the slave node local clock frequency adjustment precision. The method is implemented according to the following steps: a timer module sends adjustment moment values; a frequency acquisition module calculates a master node local clock frequency at a current adjustment moment and a slave node local clock frequency at the current adjustment moment; a count value calculation module calculates a count value of a master node local clock to be reached ata next adjustment moment; a frequency estimation module calculates an initial slave node local clock frequency adjustment value at the current moment; a frequency adjustment parameter calculation module calculates an expected slave node local clock frequency adjustment value at the current adjustment moment; and a frequency adjustment module adjusts the slave node local clock frequency. The method provided by the invention has the advantages that the time synchronization precision can be effectively improved under the premise that the network data transmission reliability is not affected andthat a network bandwidth is satisfied, so that data transmission in a network can be carried out in a more real-time manner.

Description

technical field [0001] The invention belongs to the technical field of communications, and relates to a clock frequency adjustment method, in particular to a slave node local clock frequency adjustment method based on the smallest overall error of count values. Background technique [0002] All-IP is the development trend of future networks and services. The packet network will replace the traditional SDH network and become a unified transmission bearer network. At the same time, the arrival of 5G also poses a huge challenge to the bearer network of the traditional basic network. One of the most important aspects is reflected in ultra-high-precision time synchronization. The introduction of 5G's ultra-short frame, carrier aggregation and coordinated multi-point transmission (COMP) multi-point coordination technology can drive time synchronization accuracy to increase by an order of magnitude, which can improve from 4G's ±1.5us raised to ±130ns. This poses a great challenge...

AI Technical Summary

Problems solved by technology

Although this method can eliminate the influence of the intermediate nodes of the network and improve the frequency adjustment accuracy of the slave nodes, it does not consider the error of the local count value of the master and slave nodes in the network that requires high-precision time synchronization, which affects the real-time performance of data transmission.

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