Time-Sensitive Network Application Layer Comprehensive Scheduling And Scheduling Mechanism Research

Modern internet networks are facing the ever-increasing video traffic and industrial machine applications,and there are a lot of problems such as congestion collapse and data packet delay.Applications that require relatively high network real-time performance,such as industrial Internet,vehicle unmanned driving,aerospace,etc.,require low latency and microsecond jitter.The traditional network can only reduce the end-to-end delay to tens of milliseconds.In this context,the control of the end-to-end delay of the network is particularly important.Has become a hot area of current concern.Time Sensitive Network(TSN)is a highquality real-time transmission network with bounded transmission delay,low transmission jitter,and extremely low data loss rate.Therefore,it is an important research work to provide deterministic transmission guarantee for time-sensitive networks..Thesis first studies the application-level scheduling problem of time-triggered traffic in time-sensitive networks,and defines a network system model.Communication is carried out through time-triggered traffic classes,and the task and network communication are regarded as the same scheduling problem,and the entire solution space is searched.Secondly,the design goal is set to minimize the total delay of all applications,use the defined model to construct logical constraints,and correctly describe the combination of network and task scheduling.At the same time,unnecessary constraints are reduced and the scheduling model is simplified.Finally,a comprehensive method of distributed system application layer scheduling using timetriggered traffic in Ethernet communication is proposed.Different optimization goals are considered in the method,and the work is focused on application-level optimization.The experimental evaluation uses a variety of comprehensive network topologies and system configurations,which show that the comprehensive scheduling method can effectively solve the scheduling problem and meet the requirements of time-critical tasks.If the real-time traffic with lower priority is ignored in the TSN network,the time-triggered traffic configuration may increase the worst-case delay of the real-time traffic with lower priority so that it cannot be scheduled.Calculate and analyze the worst end-to-end delay of control data and audio and video data,and establish constraints based on network bandwidth and network scheduling.Considering the real-time performance of data transmission and the utilization of network bandwidth,the genetic and tabu hybrid algorithm is used to optimize the network bandwidth parameters.Thesis uses the open source TSN simulator Ne STi Ng based on OMNe T++ to build a TSN simulation platform.Use the latest TSN simulation automation configuration tool to construct TSN simulation topology to verify the feasibility of this article on network bandwidth optimization parameters.The simulation results show that the configuration of network bandwidth parameters in this paper can meet the requirements for real-time data transmission and system schedulability.