Research On Time Sensitive Network System Technology

In the era of Industry 4.0,the digitization of production systems is gradually realized,thereby achieving seamless integration between physical objects,humans and logical entities.This new model is expected to greatly improve industrial production systems,such as reducing equipment failures and downtime,and reducing maintenance,To increase production and scale,etc.At present,many industrial automation systems rely on time synchronization(or timeliness)communication between sensing,computing,and execution devices.The advancement of Ethernet technology based on the Time Sensitive Network(TSN)standard developed by the IEEE 802.1TSN task group is significantly improving time synchronization and reducing the worst-case communication delay.At present,there are many manufacturers of system platforms and equipment that support TSN functions.In fact,in order to facilitate the promotion of their own company's products,these manufacturers integrate these functions into their own manufacturer's hardware.This means that even if it is an open source system,If you want to use these open source systems for the application development of TSN technology,you cannot bypass the supporting manufacturer's hardware.Therefore,the development of a system platform that can be separated from the manufacturer's hardware is expected to break the status quo and lay the foundation for the application and expansion of TSN technology in the future.At the same time,the layout structure of modern data centers has also created new requirements.The traditional static model can no longer meet the current needs.With the gradual expansion of the coverage network,the traditional TSN cross-domain interconnection is mainly concentrated in the TSN domain cross-domain within the same placement domain.Interconnection,in short,is to divide a TSN domain into different TSN domains by using VLAN tags,so as to realize the cross-domain interconnection of TSN between these TSN domains,and the two layers connected through the three-layer network are actually The above is isolated,and cross-domain interconnection is no longer realized.Based on the above points,the main work studied here is divided into the following parts:(1)On the basis of investigating time-sensitive network related technologies,design and propose a time-sensitive network system scheme based on SDN.Firstly,several important functions in time-sensitive network related technologies are investigated.On this basis,an SDN controller solution suitable for the study of this paper is selected,and an SDN-based time-sensitive network system solution is proposed based on the SDN controller design.(2)To realize the SDN-based time-sensitive network system solution proposed in this article,first use open source tools and technical means,use laboratory equipment that supports TSN function to build an experimental environment,and time-sensitive network time synchronization,traffic shaping and other basic functions The implementation proved the feasibility of breaking the manufacturer's hardware limitations.Then implement the TSN configuration enhancements proposed in this article,including designing WebUI,testing the selected netconf interface,writing and implementing the netconf-cilent solution of this article,setting up a test environment,and using the implemented TSN configuration enhancements to configure TSN nodes.To send work,use the command line in the corresponding TSN node to view the configuration has taken effect.(3)Propose a TSN cross-domain interoperability scheme using VxLAN,and build a test environment to verify and test the effectiveness and indicators of the interoperability scheme.This work in this article is mainly divided into two parts:First,the open source library open vSwitch+mininet is used to verify the effectiveness of the design in a virtual environment.After that,physical equipment and open vSwitch were used to build the environment in the actual environment,and the design scheme was realized.The key indicators of the scheme were measured.The results showed that the average delay jitter was 0.65 microseconds,and the average round-trip delay reached 2.28 milliseconds.Afterwards,the selected SDN controller TF was used in conjunction with openstack to verify the effectiveness of the designed scheme in a virtual environment.After that,in the actual environment,physical equipment and TF controller were used to build a test environment to realize the test plan.The key indicators of the plan were measured.The results showed that the average delay jitter was 0.28 microseconds,and the average round-trip delay was 1.088 milliseconds,the experimental results verify the effectiveness of the program.