Wireless link delay compensation device and method for industrial heterogeneous network

Abstract

The invention discloses a wireless link time delay compensation device and method facing industrial heterogeneous, and particularly relates to the wireless link time delay compensation device and method based on an IEEE 1588 time synchronization protocol under the industrial heterogeneous network. The wireless link time delay compensation device comprises an ESTW module, an ETE module and an IEEE 1588 message residence time detection and compensation module. The method comprises steps of adopting an ESTW module to realize the wireless communication between the specific Ethernet nodes, utilizing the FPGA to realize the specific IEEE 1588 message residence time detection of the ESTW module, adding the message residence time into a corresponding IEEE 1588 message correction domain to finish the wireless link time delay compensation. The wireless link time delay compensation device and method reduce the protocol overhead without correcting the current IEEE 1588 protocol, improves the network throughput, satisfies the link time delay compensation real time performance requirement, improves the time synchronization accuracy, reduces the extra hardware development requirement without affecting the current Ethernet device and enhances the practicability.

Description

technical field [0001] The invention relates to the wireless communication field of industrial heterogeneous networks, in particular to a wireless link delay compensation device and method for industrial heterogeneous networks. Background technique [0002] Building a new type of industrial backhaul network based on wireless technology can effectively reduce network deployment costs and increase network coverage. However, industrial Ethernet, as a mature and widely used industrial wired network, cannot be replaced by wireless network in the short term, resulting in the long-term coexistence of wireless network and Ethernet, which constitutes an industrial heterogeneous network. Accurate time synchronization is crucial to ensure application requirements such as real-time and security of industrial heterogeneous networks. [0003] Industrial heterogeneous network is an integration of wireless network and wired network. There are many kinds of communication links in the networ...

AI Technical Summary

Problems solved by technology

Most Ethernet chips on the market currently provide MII interfaces, but Wi-Fi chips mostly have a single-chip structure, which means that the selection of Wi-Fi node timestamps can only be realized above the MAC layer, resulting in large delay fluctuations

Therefore, the CPU processing, MAC layer queuing, PHY layer transmission and other forwarding delay errors of Wi-Fi nodes and the timestamp selection mechanism will cause link asymmetry and seriously affect the time synchronization accuracy.

Existing methods mostly use statistical principles to compensate for link delay, which increases the number of packets in the network and has poor real-time performance.

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