Research On The Scheduling Mechanism Of Industrial Heterogeneous Network For TSN And Non-TSN Interconnection

With the requirements of factory business,in particular,cloud computing,big data,etc.are applied to the field of industrial control,the integration of IT(Information Technology,IT)and OT(Operation Technology,OT)are required to ensure the transmission of big data.Meanwhile,it is also very important to guarantee the quality of data service in the process of data transmission.TSN(Time Sensitive Network,TSN)aims to establish a universal time-sensitive mechanism for Ethernet protocol to ensure real-time and deterministic network data transmission.The TSN technology being introduced into the industrial network,TSN and various communication protocols in the industrial network constitute the industrial heterogeneous network.By using the real-time and deterministic transmission characteristics of TSN,the service requirements of industrial heterogeneous networks can be met.However,in heterogeneous industrial networks,how to implement high-efficiency and high-quality scheduling to ensure the low-delay and certainty of different types of data in the network is currently a problem that needs to be resolved as soon as possible.Therefore,this thesis combines routing and bandwidth adjustment to realize the scheduling of different traffic flows in heterogeneous networks.The studies of the thesis are as follow:1.In this thesis,an industrial heterogeneous network architecture of based on TSSDN(Time Sensitive Software Defined Networking,TSSDN)is proposed.The architecture is divided into three planes: application plane,control plane,and forwarding plane.It has the characteristics of flexible network configuration and centralized computing,which can realize high-efficiency centralized management and control,and is suitable for different business requirements in the industrial control field.Among the industrial heterogeneous networks,the TSN industrial network is centrally and uniformly managed by CNC(Centralized Network Configuration,CNC);the non-TSN industrial network and the TSN industrial network across the non-TSN network are scheduled by SDN controller in the way of sending flow table to SDN switch.2.Aiming at the problem of path selection of TSN in industrial heterogeneous networks,a routing algorithm with multiple constraints and multiple goals is proposed.The algorithm classifies the data in the industrial heterogeneous network according to the delay requirements;and calculates the scheduling priority,and finallyselects an optimal path for the data in the industrial heterogeneous network.3.Aiming at the network congestion of TSN across non-TSN in industrial heterogeneous networks,a method for adjusting queue congestion based on feedback mechanism is proposed.The network congestion division is based on queue delay.There are three states: normal state,general congestion,and severe congestion.According to the three network congestion conditions,corresponding adjustment strategies are designed.4.We have built an industrial heterogeneous network test and verification system have been built for TSN and non-TSN interconnection combining virtual and real.In the test and verification system,the TSN network is a physical network,and the non-TSN network is experimented on the platform of Floodlight and Mininet.In order to verify the performance improvement of the proposed routing algorithm for network data transmission,the transmission delay is tested with and without the routing algorithm.The average data delay of the routing algorithm in this thesis is about 13.9us,and compared with the test results without the routing algorithm,the average delay is descreased.In order to verify the feasibility and effectiveness of the queue congestion adjustment method proposed in this thesis based on the feedback mechanism,the test results are compared with the link bandwidth utilization without the proposed congestion adjustment method and NIBA scheduling algorithm.By comparison,it is shown that the link bandwidth utilization rate in the network is 82.26% after adopting the congestion adjustment method in this thesis,which effectively alleviates the link congestion and guarantees the transmission of high-priority data.