Research And Design Of Time Sensitive Networking Gating Scheduling System

With the continuous development of aviation technology,the avionics airborne network has put forward higher requirements for real-time,deterministic and reliable data transmission.Traditional low-speed airborne bus can no longer meet the development needs of aviation technology,while high-speed switched networks such as Avionics Full Duplex Switched Ethernet and Time-Triggered Ethernet have problems such as difficult hardware implementation and lack of flexibility.Time Sensitive Networking(TSN),as a new type of deterministic network technology,can solve the problem of data transmission determinism well and become an important development direction of future high-speed deterministic networks.This thesis studies the application of TSN technology in airborne network scenarios and explores its feasibility to solve the transmission determinism problem of periodic flows.First,this thesis proposes a gating scheduling algorithm for TSN mechanism fusion based on constraint strategies,which applies two gating scheduling mechanisms in TSN-Time Aware Shaper(TAS)and Cyclic Queuing and Forwarding(CQF).Among them,the gating scheduling algorithm based on TAS(GSA-TAS)constructs the constraints applicable to the airborne network and solves the scheduling by Satisfiability Modulo Theories(SMT)solver to ensure the low delay and zero jitter of flow transmission.At the same time,this thesis proposes a network division approach and demonstrates its effectiveness in improving the overall solution speed through experiments.In order to achieve more efficient network traffic control and packet forwarding,this thesis considers the introduction of CQF mechanism and explores the way of mechanism fusion use,The gating scheduling algorithm based on CQF(GSACQF)transforms the traffic scheduling problem into a resource allocation problem under constraints,and after sorting the flows according to the greedy strategy,the scheduling solution is performed sequentially by setting the offset time slot,which can improve the scheduling success rate.Subsequently,in order to study the impact of the algorithm on the flow transmission delay and jitter in the airborne network scenario,this thesis completes the construction of the simulation platform,which supports the TSN standard used in the algorithm,and is able to simulate the transmission of flows in the airborne network scenario and complete the verification of the performance of the algorithm.Based on the research of the gating scheduling algorithm and the construction of the simulation platform,this thesis designs and implements a time sensitive networking gating scheduling system,completes the system requirement analysis and outline design,introduces in detail the functions of visual network construction,scheduling solution,network simulation and result analysis,and conducts complete testing of the system.The system provides a closedloop solution for the scheduling problem of periodic flows in airborne networks.