Time synchronization error compensation method for multi-hop wireless backhaul network based on PTP protocol

Abstract

The invention relates to a wireless network communication technology, and in particular relates to a time synchronization error compensation method for a multi-hop wireless backhaul network based on a PTP protocol. According to the method, based on the PTP protocol, timestamps for transmitting and receiving a PTP synchronous message Sync and a delay request message Delay_Req is counted by using an intermediate node, and local forwarding time of the synchronous message Sync and the delay request message Delay_Req and link delay of transmitting the same between nodes are detected and compensated based on a linear regression technology, and finally wireless link asymmetrical delay correction of the main and slave nodes is achieved, and time synchronization error compensation is completed. According to the method provided by the invention, message overhead is reduced by using additional time information such as header transmission compensation time of a PTP message, message transmitting and reaching time and time modification value without modifying an existing PTP protocol, requirements on real-time and high precision of time synchronization error compensation are met, existing time synchronization precision is improved and strong practicability is provided.

Description

technical field [0001] The invention relates to the field of wireless network communication, in particular to a multi-hop wireless backhaul network time synchronization error compensation method based on the PTP protocol. Background technique [0002] Multi-hop Wireless Backhaul Networks (MWBNs) aim to provide high-speed, long-distance, non-line-of-sight and low-cost wireless access services, making up for the difficulty of wiring, high cost, and network coverage of wired backhaul networks. Limitations and poor topology flexibility. Due to the harsh factory environment and difficult wiring, and in order to improve factory production efficiency, new industrial applications such as digital oil fields, smart grid wide-area interconnection, and industrial robot collaborative operation urgently need to build a wireless backhaul network integrating management and control to complete regional coverage and realize measurement and control. Mixed transmission of information such as c...

AI Technical Summary

Problems solved by technology

At the same time, open source Wi-Fi chips are not available in the current market, and the development cost of designing the MAC layer of Wi-Fi based on FPGA is too high, so it is not advisable to design wireless network nodes based on the PTP protocol

Images