Research And Implementation Of Key Technology Of TSN Clock Synchronization For Vehicle Network

With automobile intelligence,information development,automotive electronic systems put forward higher requirements for vehicle networks in terms of bandwidth,real-time,reliability,etc..Time-sensitive network(TSN)has enhanced clock synchronization,time sensation plastic scheduling and reliability on the basis of traditional Ethernet,providing a deterministic technical specification,which is considered to be a new generation of vehicle network communication standards.Clock Synchronization is the core of TSN technology.The TSN Working Group provides clock synchronization services based on Precise Time Protocol(PTP)definition IEEE 802.1AS standard(g PTP).The onboard network has challenged the TSN clock synchronous implementation technology on high reliability,central centralized calculations.On the one hand,the system needs to perform a sense of node synchronization to support fast fault detection and fault recovery;on the other hand,the clock synchronous distributed computing characteristics need to fit the development trend of central centralized computing architecture.For the above problems,this paper has been studied for TSN clock synchronization techniques for the in-vehicle network,and main work and innovation include:(1)A TSN clock synchronous implementation architecture based on centralized synchronous computing is proposed-CSC.CSC uses SDN forwarding and control plane separation design idea,introducing a centralized synchronous controller as protocol computing and control logic center,providing flexible,uniform control plane;uninstall distributed node protocol control calculation logic,effectively reducing node design complex Degree and power consumption.(2)In-depth study of CSC key technology.A tunnel-based clock information interactive mechanism is proposed to support "stateless" pure hardware forwarding equipment participation system synchronization.A synchronous control mechanism based on centralized calculations is proposed,and the clock frequency is measured and compensated in different synchronous states,effectively improves the synchronization accuracy of the CSC architecture.(3)The CSC prototype system is implemented based on the Open TSN experiment test environment,and the prototype system is functionally test and performance testing.The experimental results show that the CSC architecture enables the clock synchronization accuracy of the nanosecond level,and has good stability.In summary,this paper provides a TSN clock synchronization implementation architecture based on centralized synchronous computing based on the in-vehicle network.The realization architecture has better flexibility and network management capabilities,which can effectively reduce the cost and power consumption of the underlying exchange equipment,reduce the difficulty of network clock synchronization management and control,providing new TSN clock synchronization in the in-vehicle network Solutions.