Research On Completely Distributed Configuration Of TSN For Industrial Application

The integration of information technology and operation technology in industrial control system is the key to the intellectualization and informationization of industrial control,and the integration of the two must put forward higher requirements for high bandwidth and low delay of industrial communication network.Time Sensitive Networking(TSN)is proposed to solve this problem.IEEE 802.1Qcc defines three network configuration models: fully centralized,centralized network/distributed user,and fully distributed.The configuration architecture of fully centralized and centralized network/distributed user is too complex due to the existence of the central controller.Therefore,this thesis proposes a completely distributed configuration method of TSN for industrial applications,and designs a traffic scheduling model based on Time Aware Shaper(TAS)to ensure low delay and low jitter transmission of time-sensitive traffic.The main research work of this thesis is as follows:1.In this thesis,the standard protocols and related mechanisms of time-sensitive networks are analyzed in depth,and the characteristics and types of time-sensitive networks applied to industrial sites are summarized.Three configuration models of time-sensitive networks are analyzed in detail.2.Based on the completely distributed configuration model of TSN proposed by IEEE802.1Qcc,this thesis proposes a completely distributed configuration method of TSN for industrial applications.Firstly,the functions of various devices in the network are defined according to the network model.According to the requirements on transmission time and periodicity,traffic is divided into periodic time-sensitive traffic,non-periodic time-sensitive traffic and non-time-sensitive traffic.Then,clock synchronization,link discovery and the establishment of local information management library are completed through network initialization.Finally,the scheduling scheme is generated through the information exchange between TSN switch neighbors.Finally,the completely distributed configuration of TSN is completed.According to the characteristics of TSN completely distributed configuration method,a scheduling model based on time-aware shaper is designed.The constraint conditions proposed in this thesis are used to allocate transmission time slots for periodic time-sensitive traffic and reduce the adverse effects of gated scheduling mechanism on aperiodic traffic.3.Using the time-sensitive network switch developed by the laboratory,a method verification platform is built to verify and test the TSN completely distributed configuration method and traffic scheduling model proposed in this thesis.Experimental results show that compared with the completely centralized configuration method,the proposed completely distributed configuration method can reduce the end-to-end delay and jitter of aperiodic timesensitive streams by about 20.4% and 13.1%,respectively,which verifies the feasibility and effectiveness of the proposed method.Compared with the non-TSN technique,the proposed scheduling method can reduce the end-to-end delay and transmission jitter of periodic timesensitive streams by 22.3% and 95.9% respectively.Aiming at the characteristics of traffic flow in industrial automation and based on the time sensitive network completely distributed configuration model,a completely distributed configuration method of TSN for industrial applications is designed in this thesis.This method can be used as a reference for the application of time-sensitive networks in industrial sites with high traffic transmission requirements,large network scale and complex traffic types,and provide some thinking for the research and development of time-sensitive networks.