Research On Cross-Network Time Synchronization Method For The Convergence Of Industrial Wireless Network And TSN

With the continuous development of network service requirements and technologies,industrial control services need to be carried by networks with deterministic time delay and reliable guarantee capability.Time-sensitive Networking(TSN),which can provide microsecond deterministic service and compatible with Ethernet protocol,has attracted much attention.However,only using wired TSN can not meet the extensive deployment needs of mass sensors,automated guided vehicles and other new equipment in intelligent factories in actual business.Industrial wireless networks have been widely used for their convenience in deployment and mobility.The cooperative transmission between industrial wireless network and TSN has become a research hotspot in intelligent manufacturing.The premise of data transmission,traffic scheduling,collaborative management and other operations in intelligent manufacturing and other fields is that the whole network equipment keeps time synchronization.At present,the research on time synchronization mainly focuses on a single network,and there is less research on time synchronization of converged networks composed of different communication protocols,so the research on cross-network time synchronization is of great significance.To solve the above problems,this thesis proposes a cross-network time synchronization method suitable for the integration of industrial wireless network and TSN.The main work is as follows:1.This thesis analyzes the research status of time synchronization technology at home and abroad,and studies the related technologies of industrial wireless network time synchronization,TSN time synchronization and cross-network time synchronization.2.Aiming at the cross-network time synchronization problem of the convergence of industrial wireless network and TSN,a cross-network time synchronization method based on IEEE 1588 and one-way message propagation is proposed.Through the step-by-step synchronization mechanism,the method uses the border gateway to forward time synchronization messages between industrial wireless network and TSN.In the TSN part,the delay request response measurement mechanism is used to measure the link delay and clock offset of the master-slave node;In the part of wireless network,the influence of fixed delay on synchronization accuracy is considered in the correction,and the frequency offset in multi-hop network is estimated and compensated.3.A test and verification simulation platform is built based on OPNET and MATLAB simulation software,and the proposed cross-network time synchronization method is simulated and verified.Finally,the simulation results are analyzed.The simulation results show that the cross-network time synchronization method proposed in this thesis can meet the requirements of time synchronization accuracy in intelligent manufacturing scenarios.