Traffic Scheduling For 5G-based Wireless Time-sensitive Networking

Industry 4.0 includes three themes: intelligent factory,intelligent production and intelligent logistics.They aim to use Internet of Things(Io T)technology to realize the interconnection of all elements of industrial production,so as to improve the informatization and intelligence of modern industry.As an essential part of modern industry,industrial communication systems face rigorous challenges.On the one hand,many smart factory applications demand data delivery with ultra-high reliability within a very low end-to-end latency.On the other hand,new services place high demands on the flexibility and scalability of communication systems.To meet the requirements of the first aspect,the time-sensitive networking(TSN)task group has developed a series of ethernet-based standards to address issues such as low latency scheduling and reliable transmission in industrial communication networks.In terms of improving the flexibility and scalability of industrial communication networks,the 5th generation mobile communication technology(5G),which supports ultra-reliable and low-latency communication,is full of potential.The combination of 5G and TSN technologies as a solution for industrial communication has received much attention,and many related research works have been carried out.However,the technologies related to the integration of 5G and TSN are not yet mature,and there are still many challenges in key issues such as time synchronization and traffic scheduling.Firstly,this thesis investigates the standardization process of 5G-TSN integration,based on which the traffic scheduling problem in 5G-TSN integrated systems is studied from two aspects.The first one is the periodic traffic scheduling problem.In this study,a network containing a TSN bridge and a 5G base station is considered,and a scheduling method is designed to balance the demands on throughput and delay.Simulation results demonstrate that the proposed approach performs well in terms of reducing end-to-end latency and improving throughput.The second aspect is the hybrid traffic scheduling problem in large-scale 5G-TSN integrated systems.In this study,cyclic queuing and forwarding(CQF)is used to deal with periodic traffic,and the idea of resource reservation is used to handle aperiodic traffic.According to the different implementations of resource reservation,this research is divided into two schemes: the Dual-CQF scheme and the asynchronous scheduling scheme.In addition,the static scheduling strategy and dynamic scheduling strategy are adopted for the wired network and wireless network,respectively.Simulation results show that the proposed method can improve the scheduling success rate and resource utilization while guaranteeing reliability.