The rise of time-sensitive applications with broad geographical scope drives the development of time-sensitive networking(TSN)from intra-domain to inter-domain to ensure overall end-to-end connectivity requirements in...The rise of time-sensitive applications with broad geographical scope drives the development of time-sensitive networking(TSN)from intra-domain to inter-domain to ensure overall end-to-end connectivity requirements in heterogeneous deployments.When multiple TSN networks interconnect over non-TSN networks,all devices in the network need to be syn-chronized by sharing a uniform time reference.How-ever,most non-TSN networks are best-effort.Path delay asymmetry and random noise accumulation can introduce unpredictable time errors during end-to-end time synchronization.These factors can degrade syn-chronization performance.Therefore,cross-domain time synchronization becomes a challenging issue for multiple TSN networks interconnected by non-TSN networks.This paper presents a cross-domain time synchronization scheme that follows the software-defined TSN(SD-TSN)paradigm.It utilizes a com-bined control plane constructed by a coordinate con-troller and a domain controller for centralized control and management of cross-domain time synchroniza-tion.The general operation flow of the cross-domain time synchronization process is designed.The mecha-nism of cross-domain time synchronization is revealed by introducing a synchronization model and an error compensation method.A TSN cross-domain proto-type testbed is constructed for verification.Results show that the scheme can achieve end-to-end high-precision time synchronization with accuracy and sta-bility.展开更多
随着对新一代飞机智能化、自动化的要求越来越高,对机载总线数据传输的实时性、确定性、可靠性也提出了更高要求。OPC UA over TSN作为当前航空领域重要的创新技术,通过提供一个实时开放互联的工业通信网络架构,满足航电系统确定性时延...随着对新一代飞机智能化、自动化的要求越来越高,对机载总线数据传输的实时性、确定性、可靠性也提出了更高要求。OPC UA over TSN作为当前航空领域重要的创新技术,通过提供一个实时开放互联的工业通信网络架构,满足航电系统确定性时延和高可靠的需求,弥补传统机载总线在易用性、互操作性、带宽上的不足。该设计详细介绍了时间敏感网络(TSN)协议和开放平台通信统一架构(OPC UA)技术的基本内容,通过分析OPC UA over TSN技术的发展现状,提出了基于OPC UA over TSN的网络架构和配置架构。该技术代表着未来机载总线的发展趋势,具有很大的应用潜力。展开更多
随着制造业智能化水平的提升,工控领域对于实时通信、低成本部署和灵活组网的要求越来越高,推动着时间敏感网络(Time Sensitive Networking,TSN)向无线通信领域发展.IEEE802.11标准是使用最广泛的无线通信协议,但是由于其定义的带有冲...随着制造业智能化水平的提升,工控领域对于实时通信、低成本部署和灵活组网的要求越来越高,推动着时间敏感网络(Time Sensitive Networking,TSN)向无线通信领域发展.IEEE802.11标准是使用最广泛的无线通信协议,但是由于其定义的带有冲突避免的载波侦听多路访问机制(Carrier Sense Multiple Access with Collision Avoid,CSMA/CA)存在随机退避、实时性差等特点,导致TSN无法直接应用到无线网络.建立无线TSN的首要任务是实现端到端的时钟同步,针对IEEE802.11自身同步机制对上层同步支持缺失的问题,提出一种面向无线网络通信的基于信标帧的时钟同步方法,与精确时间协议(Precision Time Protocol,PTP)等主流时钟同步机制相比,该方法合理利用无线信道中的信标流量,显著降低了同步所需的网络开销.通过在开源平台openwifi上运行该同步机制与PTP进行对比实验,结果表明这种同步方法能够以远低于PTP的网络开销达到与PTP同一个量级的μs级同步精度,为将TSN推广至无线网络奠定基础.展开更多
基金supported in part by National Key R&D Program of China(Grant No.2022YFC3803700)in part by the National Natural Science Foundation of China(Grant No.92067102)in part by the project of Beijing Laboratory of Advanced Information Networks.
文摘The rise of time-sensitive applications with broad geographical scope drives the development of time-sensitive networking(TSN)from intra-domain to inter-domain to ensure overall end-to-end connectivity requirements in heterogeneous deployments.When multiple TSN networks interconnect over non-TSN networks,all devices in the network need to be syn-chronized by sharing a uniform time reference.How-ever,most non-TSN networks are best-effort.Path delay asymmetry and random noise accumulation can introduce unpredictable time errors during end-to-end time synchronization.These factors can degrade syn-chronization performance.Therefore,cross-domain time synchronization becomes a challenging issue for multiple TSN networks interconnected by non-TSN networks.This paper presents a cross-domain time synchronization scheme that follows the software-defined TSN(SD-TSN)paradigm.It utilizes a com-bined control plane constructed by a coordinate con-troller and a domain controller for centralized control and management of cross-domain time synchroniza-tion.The general operation flow of the cross-domain time synchronization process is designed.The mecha-nism of cross-domain time synchronization is revealed by introducing a synchronization model and an error compensation method.A TSN cross-domain proto-type testbed is constructed for verification.Results show that the scheme can achieve end-to-end high-precision time synchronization with accuracy and sta-bility.
文摘随着对新一代飞机智能化、自动化的要求越来越高,对机载总线数据传输的实时性、确定性、可靠性也提出了更高要求。OPC UA over TSN作为当前航空领域重要的创新技术,通过提供一个实时开放互联的工业通信网络架构,满足航电系统确定性时延和高可靠的需求,弥补传统机载总线在易用性、互操作性、带宽上的不足。该设计详细介绍了时间敏感网络(TSN)协议和开放平台通信统一架构(OPC UA)技术的基本内容,通过分析OPC UA over TSN技术的发展现状,提出了基于OPC UA over TSN的网络架构和配置架构。该技术代表着未来机载总线的发展趋势,具有很大的应用潜力。
文摘随着制造业智能化水平的提升,工控领域对于实时通信、低成本部署和灵活组网的要求越来越高,推动着时间敏感网络(Time Sensitive Networking,TSN)向无线通信领域发展.IEEE802.11标准是使用最广泛的无线通信协议,但是由于其定义的带有冲突避免的载波侦听多路访问机制(Carrier Sense Multiple Access with Collision Avoid,CSMA/CA)存在随机退避、实时性差等特点,导致TSN无法直接应用到无线网络.建立无线TSN的首要任务是实现端到端的时钟同步,针对IEEE802.11自身同步机制对上层同步支持缺失的问题,提出一种面向无线网络通信的基于信标帧的时钟同步方法,与精确时间协议(Precision Time Protocol,PTP)等主流时钟同步机制相比,该方法合理利用无线信道中的信标流量,显著降低了同步所需的网络开销.通过在开源平台openwifi上运行该同步机制与PTP进行对比实验,结果表明这种同步方法能够以远低于PTP的网络开销达到与PTP同一个量级的μs级同步精度,为将TSN推广至无线网络奠定基础.
