Design And Implementation Of Scheduling Mechanism For Asynchronous Traffic Shaper

With the penetration of Internet technology into many fields,new applications are emerging one after another.In the face of consumers' increasing demand for low-latency services and the transmission requirements of unmanned driving,telemedicine and other scenarios with a deterministic delay of 1-10 ms,the current network can no longer meet.The solution that provides deterministic technology is divided into two types: synchronous and asynchronous.The former's representative technology is Time Aware Shaper.Compared with this,the latter's Asynchronous Traffic Shaper(ATS)technology has more advantages in terms of clock synchronization,bandwidth utilization,and support for Sporadic Time Sensitive.When the ATS technology is used in the actual network,if it is not equipped with an efficient scheduling mechanism,its applicable scenarios will be limited and the performance will be greatly reduced.When the ATS technology is used in the actual network,if it is not equipped with an efficient scheduling mechanism,its applicable scenarios will be limited and the performance will be greatly reduced.In order to use ATS technology to effectively solve the demand for deterministic transmission in the network,this paper designs and implements a scheduling mechanism for ATS under the Software Defined Network architecture.Through flexible control strategies,it provides resource planning for delay deterministic services,improves network service capabilities,and is compatible with different types of traffic.The research significance is very important.The specific work of this paper is as follows:First,this paper analyzes the time sensitive traffic scheduling problem in scenarios with complex traffic and wide range of delay requirements,and proposes the optimal matching and multi-path balancing scheduling strategy with resource utilization as the optimization goal.By performing preprocessing operations to reduce the number of service satisfaction checks in the scheduling process.In a dynamic scenario,the scheduling success rate and admission response speed are considered comprehensively,and then the scheduling strategy that is the first to adapt and adjust the flow priority is proposed,and waste is reduced by maintaining and using fragmented resources.The network status management module is designed to provide real-time and effective data for the scheduling module.Secondly,to address the problem of insufficient scheduling for the former by the network in the mixed transmission scenario of time non-sensitive traffic and time sensitive traffic,a minimum delay routing based on the actual state of the network is implemented for time non-sensitive traffic to optimize its delay performance and improve user experience.In order to improve the response speed,a minimum delay path matrix is maintained,which simplifies routing planning to table lookup operations.In view of the problem of inter-stream interference,the priority space is divided,and differentiated services can be provided between time non-sensitive traffic group.By designing the device SID mapping module in the control plane,and defining the data packet processing logic in the data plane,Segment Routing and IPv4 forwarding are supported,enabling flexible scheduling and reducing the overhead of flow table update and maintenance.Finally,this paper deploys a test environment to verify the functions of each module,and analyzes the performance of the static and dynamic scheduling strategies proposed in this paper through experiments.Compared with the strategy combination of disorder,shortest path,no resource fragment utilization,and no rescheduling: the optimal matching and multi-path balancing scheduling strategy performs better in extreme scheduling capability and resource utilization;the first to adapt and adjust the flow priority strategy exhibits a higher scheduling success rate while maintaining an acceptable response speed.