Research And Implementation Of Configuration Method For Dynamic Topology Time-Sensitive Networking

Time-Sensitive Networking(TSN)is an emerging Ethernet technology that ensures network real-time communication with minimum latency,enabling data transmission with low latency and high reliability.During the network operation,it is unavoidable that there will be some factors that will cause the network topology changes,such as the increase of network business,the disconnection of network devices,the increase of network devices,and so on,which will further lead to the changes in the mode of real-time traffic transmission and scheduling in the network.Therefore,network managers need to reconfigure the network according to the real-time requirements of the network.However,the current network configuration technology is mostly static configuration,which has some limitations.For these situations,how to quickly recalculate the time-sensitive network configuration in the context of network topology changes caused by device changes is an urgent problem to be solved.Therefore,a time-sensitive network configuration method for topological changes is designed and implemented in this thesis.The main research work is as follows:1.In view of the network topological changes in time-sensitive networks,this thesis presents a time-sensitive network configuration model for topological changes based on the full centralized configuration model of IEEE 802.1Qcc,and designs a time-sensitive network configuration method for topological changes.This method aims at the network configuration problem after the network topology changes,obtains the network changes through the network topology discovery mechanism,re-plans the transmission path for the TSN streams through the path selection algorithm,and then schedules the TSN streams,which improves the network configuration efficiency.2.Based on the route selection method mentioned in this thesis,a gated list scheduling method is designed after the TSN streaming route planning is completed by CNC.This method calculates the dispatch cycle,allocates transmission time slots for TSN streams transmitted on each transmission path by designing relevant constraints,and then calculates a gated list of TSN streams transmitted after topological changes.After the topology changes,CNC ensures the deterministic transmission of TSN streams and efficient network configuration after the topology changes by recalculating the transmission paths and gated lists of TSN streams.The recalculated configuration file is sent down to the TSN switch to update configuration information for topological changes and to dynamically configure time-sensitive networks.3.This thesis establishes a time-sensitive network configuration method test and validation platform for topological changes,and tests and validates the network configuration information before and after topological changes,and analyses the transmission delay.The test results show that the functions of network topology discovery,route re-selection and gated list re-calculation can be achieved after using the configuration methods mentioned in this thesis.The maximum transmission delay of TSN streams is 22.8μs decreased to 16.63 μs.In summary,the time-sensitive network configuration method proposed in this thesis for topological changes can achieve dynamic network configuration after topological changes,effectively improve network management efficiency and ensure the certainty of TSN streaming.