Article(id=1251893515979014741, tenantId=1146029695717560320, journalId=1251234473337991274, issueId=1251893504037831074, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1003-3114.2025.05.023, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1734278400000, receivedDateStr=2024-12-16, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1776404273265, onlineDateStr=2026-04-17, pubDate=1758124800000, pubDateStr=2025-09-18, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1776404273265, onlineIssueDateStr=2026-04-17, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1776404273265, creator=13701087609, updateTime=1776404273265, updator=13701087609, issue=Issue{id=1251893504037831074, tenantId=1146029695717560320, journalId=1251234473337991274, year='2025', volume='51', issue='5', pageStart='877', pageEnd='1134', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1776404270419, creator=13701087609, updateTime=1776404832543, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1251895861849043019, tenantId=1146029695717560320, journalId=1251234473337991274, issueId=1251893504037831074, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1251895861849043020, tenantId=1146029695717560320, journalId=1251234473337991274, issueId=1251893504037831074, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1102, endPage=1112, ext={EN=ArticleExt(id=1251893516738183802, articleId=1251893515979014741, tenantId=1146029695717560320, journalId=1251234473337991274, language=EN, title=Architecture and Application Verification of Wide-area End-to-End Deterministic Network, columnId=1251893506852205086, journalTitle=Radio Communications Technology, columnName=Engineering Practice and Application Technology, runingTitle=null, highlight=null, articleAbstract=

In industrial networks, more and more intelligent applications put forward new requirements for deterministic guarantee ability of end-to-end transmission. Most of current research works on deterministic technologies focus on guarantee of their own network certainty, but ignore end-to-end determinism requiring cooperation of multiple deterministic technologies. Based on application scenario of nuclear power industry, a wide-area end-to-end deterministic network architecture with Flexible Ethernet (FlexE) and Time-Sensitive Networking (TSN) fusion is proposed, and an architecture is elaborated from two aspects of control plane function and data plane cooperative scheduling. In real wide area network environment, based on the dual-motor collaboration and industrial machine vision application scenario, the performance of the architecture is tested and verified. Results show that the architecture can meet the needs of applications for wide-area end-to-end deterministic networks, and offer good application value.

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在工业网络中,越来越多的智能化应用对网络端到端传输的确定性保障能力提出了新的要求。当前确定性技术的研究大多关注自身网络层级的确定性保障,忽略了需要多种确定性技术协同配合的端到端确定性。基于核电行业应用场景,提出了一种灵活以太网(Flexible Ethernet,FlexE)和时间敏感网络(Time-Sensitive Networking,TSN)融合的广域端到端确定性网络架构,从控制面功能与数据面协同调度2个方面对该架构进行了详细阐述。在真实的广域网络环境中,基于双电机协同与工业机器视觉应用场景,对架构进行了性能测试与验证。结果表明,该架构能够满足应用对广域端到端确定性网络的需求,具有良好的应用价值。

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刘美慧 女,(1999—),博士研究生。主要研究方向:时间敏感网络、确定性网络。

陈焱 男,(1988—),工程师。主要研究方向:核电、电力工程领域的通信网络业务及信息化、数字化、智能化业务的研究、规划及设计。

沈彬 女,(1983—),高级工程师。主要研究方向:信息通信技术与工业互联网领域的研究、规划、标准等。

付韬 男,(1988—),博士,高级工程师。主要研究方向:工业互联网中的确定性网络、工业算力及其融合理论与应用。

许方敏 男,(1982—),博士,副教授。主要研究方向:物联网、未来网络技术。

赵成林 男,(1964—),博士,教授,博士生导师。主要研究方向:短距无线电传输技术、认知无线电技术、毫米波技术、工业互联网。

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刘美慧 女,(1999—),博士研究生。主要研究方向:时间敏感网络、确定性网络。

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刘美慧 女,(1999—),博士研究生。主要研究方向:时间敏感网络、确定性网络。

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陈焱 男,(1988—),工程师。主要研究方向:核电、电力工程领域的通信网络业务及信息化、数字化、智能化业务的研究、规划及设计。

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陈焱 男,(1988—),工程师。主要研究方向:核电、电力工程领域的通信网络业务及信息化、数字化、智能化业务的研究、规划及设计。

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沈彬 女,(1983—),高级工程师。主要研究方向:信息通信技术与工业互联网领域的研究、规划、标准等。

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沈彬 女,(1983—),高级工程师。主要研究方向:信息通信技术与工业互联网领域的研究、规划、标准等。

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付韬 男,(1988—),博士,高级工程师。主要研究方向:工业互联网中的确定性网络、工业算力及其融合理论与应用。

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付韬 男,(1988—),博士,高级工程师。主要研究方向:工业互联网中的确定性网络、工业算力及其融合理论与应用。

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许方敏 男,(1982—),博士,副教授。主要研究方向:物联网、未来网络技术。

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许方敏 男,(1982—),博士,副教授。主要研究方向:物联网、未来网络技术。

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赵成林 男,(1964—),博士,教授,博士生导师。主要研究方向:短距无线电传输技术、认知无线电技术、毫米波技术、工业互联网。

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赵成林 男,(1964—),博士,教授,博士生导师。主要研究方向:短距无线电传输技术、认知无线电技术、毫米波技术、工业互联网。

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Slice parameters for master-slave motor test

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网络功能切片类型切片带宽/Mb切片VLAN ID
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TSN-over-FlexE业务20无VLAN
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主从电机测试切片参数

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网络功能切片类型切片带宽/Mb切片VLAN ID
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Slice parameters for industrial machine vision test

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网络功能切片类型切片带宽/Mb切片VLAN ID
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TSN-over-FlexE业务500无VLAN
确定性保障背景400100
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工业机器视觉测试切片参数

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网络功能切片类型切片带宽/Mb切片VLAN ID
无确定性保障混合500无VLAN
TSN-over-FlexE业务500无VLAN
确定性保障背景400100
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广域端到端确定性网络架构及应用验证
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刘美慧 1 , 陈焱 2 , 沈彬 3 , 付韬 3 , 许方敏 1 , 赵成林 1
无线电通信技术 | 工程实践及应用技术 2025,51(5): 1102-1112
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无线电通信技术 | 工程实践及应用技术 2025, 51(5): 1102-1112
广域端到端确定性网络架构及应用验证
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刘美慧1, 陈焱2, 沈彬3, 付韬3, 许方敏1, 赵成林1
作者信息
  • 1.北京邮电大学 信息与通信工程学院,北京 100876
  • 2.深圳中广核工程设计有限公司,广东 深圳 518100
  • 3.中国信息通信研究院,北京 100191
  • 刘美慧 女,(1999—),博士研究生。主要研究方向:时间敏感网络、确定性网络。

    陈焱 男,(1988—),工程师。主要研究方向:核电、电力工程领域的通信网络业务及信息化、数字化、智能化业务的研究、规划及设计。

    沈彬 女,(1983—),高级工程师。主要研究方向:信息通信技术与工业互联网领域的研究、规划、标准等。

    付韬 男,(1988—),博士,高级工程师。主要研究方向:工业互联网中的确定性网络、工业算力及其融合理论与应用。

    许方敏 男,(1982—),博士,副教授。主要研究方向:物联网、未来网络技术。

    赵成林 男,(1964—),博士,教授,博士生导师。主要研究方向:短距无线电传输技术、认知无线电技术、毫米波技术、工业互联网。

Architecture and Application Verification of Wide-area End-to-End Deterministic Network
Meihui LIU1, Yan CHEN2, Bin SHEN3, Tao FU3, Fangmin XU1, Chenglin ZHAO1
Affiliations
  • 1.School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • 2.China Nuclear Power Design Co. , Ltd. (Shenzhen), Shenzhen 518100, China
  • 3.China Academy of Information and Communications Technology, Beijing 100191, China
出版时间: 2025-09-18 doi: 10.3969/j.issn.1003-3114.2025.05.023
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在工业网络中,越来越多的智能化应用对网络端到端传输的确定性保障能力提出了新的要求。当前确定性技术的研究大多关注自身网络层级的确定性保障,忽略了需要多种确定性技术协同配合的端到端确定性。基于核电行业应用场景,提出了一种灵活以太网(Flexible Ethernet,FlexE)和时间敏感网络(Time-Sensitive Networking,TSN)融合的广域端到端确定性网络架构,从控制面功能与数据面协同调度2个方面对该架构进行了详细阐述。在真实的广域网络环境中,基于双电机协同与工业机器视觉应用场景,对架构进行了性能测试与验证。结果表明,该架构能够满足应用对广域端到端确定性网络的需求,具有良好的应用价值。

广域端到端  /  确定性网络  /  灵活以太网  /  时间敏感网络  /  工业应用验证

In industrial networks, more and more intelligent applications put forward new requirements for deterministic guarantee ability of end-to-end transmission. Most of current research works on deterministic technologies focus on guarantee of their own network certainty, but ignore end-to-end determinism requiring cooperation of multiple deterministic technologies. Based on application scenario of nuclear power industry, a wide-area end-to-end deterministic network architecture with Flexible Ethernet (FlexE) and Time-Sensitive Networking (TSN) fusion is proposed, and an architecture is elaborated from two aspects of control plane function and data plane cooperative scheduling. In real wide area network environment, based on the dual-motor collaboration and industrial machine vision application scenario, the performance of the architecture is tested and verified. Results show that the architecture can meet the needs of applications for wide-area end-to-end deterministic networks, and offer good application value.

wide-area end-to-end  /  deterministic network  /  FlexE  /  TSN  /  industrial application verification
刘美慧, 陈焱, 沈彬, 付韬, 许方敏, 赵成林. 广域端到端确定性网络架构及应用验证. 无线电通信技术, 2025 , 51 (5) : 1102 -1112 . DOI: 10.3969/j.issn.1003-3114.2025.05.023
Meihui LIU, Yan CHEN, Bin SHEN, Tao FU, Fangmin XU, Chenglin ZHAO. Architecture and Application Verification of Wide-area End-to-End Deterministic Network[J]. Radio Communications Technology, 2025 , 51 (5) : 1102 -1112 . DOI: 10.3969/j.issn.1003-3114.2025.05.023
第四次工业革命的到来催生了新的生产模式和业务生态,各种时间敏感型应用不断涌现,对网络的端到端确定性传输能力提出了新的要求。以核电行业为例,智能化核电厂中的自动化控制、远程辅助决策、可视化施工等业务,要求网络具备确定性时延和高可靠性。核电厂工业物联网平台从厂房中采集的智能核电相关数据需要输送至集团总部进行分析和模型训练,并实时反馈计算结果以实现辅助决策,要求核电厂与集团总部之间端到端传输时延在20 ms以内[1]。在厂房中,对于专业性要求高的操作,现场人员需要佩戴增强现实眼镜在专家远程指导下进行作业,上述过程中视频流等信息的传输要求网络带宽不低于1 Gb,丢包率不超过0.5%[2];核电基地厂房数量众多,同一业务可能分布在不同位置厂房中,不同厂房之间的关键业务通信要求端到端时延在20 ms内、端到端时延抖动在10 μs内[3]。此外,通信网络还需要具备对不同业务间进行有效隔离与带宽资源灵活分配的能力,以保障各类业务数据的独立传输与差异化服务质量。传统的IP网络通常只提供“尽力而为”的网络服务,容易受到网络拥塞、网络故障及突发流量等情况的影响,无法为实时应用提供有界的时延、抖动与零丢包的传输保障,因此无法满足核电厂中时间敏感型应用的需求。
确定性网络技术旨在保障关键业务传输的可预测性与确定性,近年来受到广泛关注。光互联网论坛于2015年推出了FlexE技术[4],FlexE凭借其灵活切片能力被广泛用于带宽预留与业务隔离。TSN工作组基于时钟同步、流量调度和资源预留等机制制定了一系列标准,在局域网范围内实现了时间敏感型业务与普通业务的混合承载[5-6]。国际互联网工程任务组的确定性网络工作组在TSN相关标准的基础上进行扩展,提出适用于3层网络的指定周期的排队和转发(Cycle Specified Queuing and Forwarding,CSQF)机制[7],将确定性传输扩展至广域范围。由华为牵头提出的确定性IP(Deterministic IP,DIP)技术同样专注与3层网络的确定性,旨在保障关键业务传输的低抖动与有界时延[8]。然而,上述主流确定性网络技术的架构与机制设计通常受限于自身所处的网络层级,致使单一确定性网络技术在保障能力与覆盖范围方面存在局限性,无法满足业务端到端确定性传输的需求。因此,对多层确定性网络技术融合与跨域资源协同调度的研究具有重要意义。
当前的广域确定性网络技术,如FlexE、DIP和确定性网络等,可以有效保障业务在广域网络阶段的确定性传输。然而,在实际应用场景中,用户或设备往往并非直接与广域网络相连,而是遵循“本地应用-局域网-广域网-对端局域网-对端应用”的传输拓扑结构。鉴于局域网与广域网通常采用不同的确定性网络技术,探究如何实现异构确定性网络的协同部署,已成为实现端到端确定性传输的关键研究课题。依托智能核电场景中确定性传输需求,提出了一种基于TSN技术与FlexE技术的广域端到端确定性网络融合架构,从控制面与数据面2个角度对该架构进行了详细介绍,并搭建了远程电机协同、工业机器视觉2个测试床,对所提架构的端到端确定性保障能力进行了验证。
FlexE技术通过在标准以太网基础上引入FlexE Shim来实现物理层和链路层的解耦,从而实现网络业务带宽的动态灵活调整,可以提供捆绑、通道化和子速率3种功能[9],常被用于网络硬切片以实现带宽分配和业务隔离,在5G网络切片和专网构建中有着广泛的应用[10]。FlexE技术一方面能够简化数据包在设备中的处理过程从而降低处理时延,另一方面,还能确保关键业务传输通道的专用性,即使在其他业务突发的情况下,也能保障关键业务的传输不受影响。此外,FlexE支持网络设备之间的时间同步和频率同步,允许同步报文在FlexE通道中进行传输[11]。FlexE的上述特性使其能够满足确定性网络调度时对时钟同步的需求,为其与TSN技术的协同应用提供了关键支撑。
Vilalta等[12]提出将FlexE网络集成到软件定义网络架构中,以实现承载网中的动态网络切片。Koulougli等[13-15]将FlexE技术融入多层多域网络中,提高了网络整体的资源利用率和故障修复能力。Liang等[16]将FlexE与弹性光网络相结合,对跨层网络规划进行优化,并设计了一种启发式算法求解最优调度。然而,上述研究大多关注网络资源的充分利用,而忽略了对业务端到端确定性时延的保障。张朝[17]将TSN端设备与FlexE网络结合,提出一种能够增强以太网承载能力的实时网络带宽资源重构机制,能够在降低数据传输时延的同时,对网络底层的带宽资源进行灵活分配,大大提升网络的业务承载能力。上述研究虽然尝试将TSN与FlexE进行融合,但是却局限于单一节点,缺乏整体架构的设计。
TSN技术工作于数据链路层,基于以太网进行扩展,在保障关键流量低时延低抖动传输的同时,能够对其他类型流量进行混合承载,解决了传统实时以太网带宽不足和布线复杂的问题,被认为是未来工业网络的重要演进方向。TSN协议族主要从时钟同步、流量调度、资源预留和网络管控几方面进行规定,将网络中的流量按照重要程度划分成8个等级(0~7,7为最高优先级),与交换机出端口的8个队列一一对应。流量调度是TSN保障业务确定性传输的核心机制,根据是否需要全局的时钟同步,TSN的流量调度机制可分为同步调度和异步调度两大类。时间感知整形[18]和循环排队转发[19]机制作为2种典型的同步调度机制,受到学术界和产业界的广泛关注。
Li等[20]提出了TSN中的联合路由调度算法,能够有效降低业务的端到端时延,加速了调度决策过程。Dürr等[21]采用无等待传输的方法调度TSN中的关键业务,并设计了流排序与压缩算法以提高网络的可调度性。然而,上述研究仍受限于局域网范围,无法应用于大规模网络。为了将TSN扩展至广域范围,汪硕等[22]提出了基于软件定义的时间敏感网络跨域调度机制,利用3种广域时钟同步技术保障域间时钟同步,实现了不同TSN域的无缝对接与融合调度。Huang等[23]提出了TSN与CSQF网络融合架构,使用周期模型归一化的方法实现跨域互联。Peng等[24]进一步研究多TSN域多CSQF域的融合网络架构,并设计了基于周期映射的跨域调度算法以提高网络的整体性能。虽然上述研究基于循环排队转发机制实现了TSN在广域范围的应用,但是网络边界设备上跨域周期映射计算较为复杂,且循环排队转发和CSQF均侧重于降低业务传输抖动,在端到端时延方面几乎没有优势。
在广域确定性传输领域,研究的热点主要集中于3层网络的确定性传输。强鹂等[25]提出了一种适用于大规模网络部署的3层转发技术,可实现时延上界和抖动上界的严格保证;石鸿伟等[26]提出了面向广域确定性网络的控制面关键技术及设计思想,详细阐述了实现确定性网络感知、业务规划和流量调度的具体方案;Wu等[27]基于DIP网络,将出端口的队列根据周期长度划分成多个组,从而满足不同的服务质量需求;Krolikowski等[28]基于CSQF机制,使用列生成和动态规划算法对大规模KGR网络的联合路由调度问题进行求解,提升了网络计算的效率。上述大规模确定性网络技术的研究均集中关注3层网络确定性机制的优化,忽略了多层确定性网络技术的协同配合与端到端的业务的确定性传输保障。
在核电领域中,不同核电厂之间的跨域连接、集团总部与核电基地之间的通信,均为广域端到端传输的典型应用场景。如图1所示,核电厂、设计院与集团总部位于不同的局域网中,由于不同园区之间的地理位置相距较远,不同局域网内设备之间的数据传输可看作广域端到端通信。图中,切片1的带宽W1和切片2的带宽W2的大小均为R,集团总部对外传输速率为2R,深圳设计院及电站配套设施(Balance of Plant,BOP)厂房的链路传输速率均为R。由于广域网与局域网带宽的不一致性,在网络边界节点处很容易发生跨域接口的拥塞或丢包,严重影响业务端到端传输性能。
为了满足智能化核电厂中远程辅助决策、可视化施工等业务的端到端确定性传输需求,设计了一种TSN与FlexE网络融合架构。该架构基于文献[22]中的广域时钟同步技术保障域间时钟同步,所有局域网内部署TSN,使用TAS机制降低业务在TSN域内的传输时延,利用门控列表控制交换机出端口8个队列的传输,保障时间敏感流不受其他流的影响。不同TSN域之间使用FlexE网络相连,FlexE按照业务需求对网络进行灵活切片,能够确保跨域互联传输路径上所有接口带宽的一致性。源TSN(Source TSN,STSN)域中产生的时间敏感业务流量,在域内按照所规划的路径传输至边界交换机,随后映射至FlexE域中指定切片进行传输,到达对端TSN域后,根据对端TSN域的调度决策传输至目的节点。在上述过程中,控制器为业务规划传输路径并预留传输资源,以实现确定性时延和低抖动传输。
跨域资源的协同调度需要控制面的统一编排,以实现端到端路径上的资源预留。TSN与FlexE融合网络架构如图2所示。控制面采用集中式架构,主要包含全局控制器、TSN控制器和FlexE控制器三大模块,TSN和FlexE控制器是逻辑上的控制模块,在实际应用中可以与全局控制器集中在一个物理实体上。转发面由TSN和FlexE网络中的各用户和网络设备组成。用户业务从STSN域出发,经过FlexE网络的承载传输至目的TSN(Destination TSN,DTSN)域的网络设备。全局控制器用于监控全网状态信息和执行调度决策,具有拓扑管理、准入控制、时延预估、全局计算和资源预留等功能。TSN和FlexE网络各自的逻辑控制器用于上报域内状态信息与计算域内调度配置,全局控制器统筹全网业务需求与资源状态,进行业务编排计算与决策下发。
TSN与FlexE融合网络架构的管控接口交互流程如图3所示。全局控制器周期性地收集各域内网络状态信息,实现对全网资源状态的实时掌控。当STSN中用户发起任务请求,该业务的基本信息(源、目的、周期、时延要求、带宽要求等)将被上报至全局控制器。全局控制器收到业务请求后,基于各网络域的剩余资源状态,对该业务的端到端时延进行预估,若网络剩余资源能够满足业务的时延和带宽要求,则该业务调度成功,反之,调度失败。全局控制器将准入决策信息反馈至TSN控制器,当业务被接收时,STSN控制器进行域内路径规划与门控计算,并将交换机门控列表等配置信息下发至STSN各设备中执行。同时,DTSN域控制器根据业务信息提前进行路径规划与资源预留,确保业务在DTSN域内能够低时延低抖动传输。全局控制器根据资源编排结果将切片需求信息返回至FlexE控制器,FlexE控制器根据传输需求进行TSN流在FlexE边界设备上跨域映射计算,并将最终的配置信息下发至域内各网络设备中执行。上述交互流程实现了各网络域的资源规划与配置,保障了时间敏感业务端到端的确定性传输。
在TSN中,数据帧的格式为IEEE 802.1Q规定的以太网帧结构。如图4所示,TSN基于以太网帧头中IEEE 802.1Q虚拟局域网(Virtual Local Area Network,VLAN)标签中的优先级代码点字段和VLAN识别符进行TSN流的标识[29]。由于FlexE网络中承载的数据帧同样使用以太网帧结构,因此TSN业务数据可直接接入FlexE网络进行承载转发,为TSN与FlexE网络融合提供了便利。
图5所示,TSN边界网络设备与FlexE边界网络设备相连时,通过配置VLAN ID引导TSN流量进入对应的FlexE切片通道,TSN流会进入与自身VLAN ID相同的切片中进行传输。类似地,当业务数据从FlexE边界设备进入TSN边界设备时,通过合理配置边界端口的VLAN ID即可将业务数据正确地交付至目的网络设备。FlexE网络基于Shim和Calendar机制进行切片带宽分配,TSN业务作为FlexE Client数据流被传输至FlexE Shim层,此时所有数据已完成64 Byte/66 Byte编码成为66 Byte Block流,Shim层将66 Byte Block分发至Calendar中。Calendar由多个sub-calendar组成,每个subcalendar中有20个时隙,每个66 Byte Block承载在一个时隙中[17]。Shim层根据切片带宽需求为每个切片计算和分配时隙,并通过轮询的分配方式完成TSN业务数据到一个或多个时隙的映射。当业务或切片带宽改变时,Shim层会重新计算业务数据和时隙之间的映射关系,以满足业务的传输需求。
无向图G=(VE)表示网络整体的拓扑,V表示网络中所有节点,E表示所有链路。设有K个TSN域通过FlexE网络互联,TSN域的集合表示为ATSN={A1A2,…,AK},Fk为TSN域Ak中所有TSN业务流的集合,k∈{1,2,…,K},TSN域Ak的边界设备的端口速率为Rk。每一条TSN流Fk可以用六元组{sidipicibiti}表示,其中si为源地址,di为目的地址,pi为流周期,ci为业务大小,bi表示带宽需求,ti表示时延要求,表示流在链路[vavb]上的第j个帧传输实例,表示该实例相对于超周期起始的传输时刻,表示该实例的传输时长。FlexE网络可使用的总带宽为W,切片配置细粒度为g,单个切片的最大带宽为G。假设所有TSN域具有相同的超周期T(网络中所有流的周期的最小公倍数)。
当下列传输约束被满足时,TSN控制器判断域内资源符合传输需求。
①帧约束。要求非负,且保证在周期内完成传输。对∀Fk,[vavb]∈Ak,有:
②链路约束。要求同一链路任意两帧传输无重叠。对∀Fk,[vavb]∈Ak,有:
式中:αβ均为整数,
当STSN域Ak的用户发起请求时,STSN域控制器判断是否存在满足上述传输约束的到达STSN域边界交换机的路径。若不存在,则拒绝该任务;若存在多条满足条件的路径,则控制器计算每条路径的时延,并选择时延最短的路径PSTSN,该路径的传输时延记为DSTSN,任务传输的起始时刻为tstart
STSN域控制器初步判断域内资源满足传输需求后,将DSTSN上报至全局控制器用于后续端到端时延估计。此时,全局控制器为新增的业务规划网络切片。设当前FlexE域中存在N个网络切片,切片集合为S={S1S2,…,SN},任意切片SiS的带宽为Bi=ki·gki为正整数,则有:W。假设当前连接STSN域和DTSN域的网络切片数量为x,为了最小化切片带宽的占用,网络切片的规划如下:
①若x=0,则为业务流新增一个切片SN+1,其带宽=BN+1满足:
式中:kN+1为正整数,上式为业务流规划了一个满足业务传输的最小切片。
②若x≠0,设当前连接STSN域和DTSN域的网络切片的集合为Ssd={,…,},由于所有切片的带宽是切片粒度g的整数倍,因此并非所有切片带宽均被占满,任意切片Ssd的切片带宽为,所承载的业务带宽为。将业务流并入切片中,同时将切片的带宽大小增大α·g,满足:
式(4)表示将业务流并入合适的切片中使得切片占用的总带宽最小,若所有现存的切片均无法并入,则根据式(3)创建新的切片。
最终,全局控制器为业务流规划带宽为的切片进行传输,传输时延为:
业务流到达DTSN域的时刻相对于超周期起始的传输时刻为:
类似地,DTSN域控制器获取tarrive与业务流的信息,根据式(1)、式(2)计算是否存在满足约束的传输路径。若不存在上述路径,则拒绝该任务;若存在,则选择时延最短的路径PDTSN,该路径的传输时延记为DDTSN。因此,业务的端到端时延DE2E为:
DE2Eti,则满足业务传输的时延要求,全局控制器下发业务准入决策,各区域控制器将配置信息(包括STSN域传输路径PSTSN及路径上各交换机门控配置,FlexE切片配置,DTSN域传输路径PDTSN及路径上各交换机门控配置等)下发至各网络设备。
TSN跨域资源调度示意如图6所示。图中H表示超周期,tstarti表示业务i的传输起始时刻,tarriveij表示业务i到达TSN域j的时间相对于超周期起始的时刻,控制器通过全网的资源编排为每个任务精确规划了互不重叠的传输时隙,避免了任务冲突带来的额外时延。
为验证所提架构的有效性,搭建了一个跨越超1 000 km的广域端到端确定性网络测试床,对TSN与FlexE融合网络进行测试验证。上述广域确定性网络由位于A、B两地的TSN交换机、NE1~NE3三台FlexE设备构成,A、B地之间的直线距离超过了1 000 km。测试验证从网络性能测试和应用验证两方面展开。
网络性能测试的拓扑如图7所示,将测试仪的发送端和接收端分别与STSN域和DTSN域的2台TSN交换机相连,构成一个跨越广域网的环路,以模拟业务跨域端到端传输。FlexE设备之间的链路速率为100 Gb/s,TSN交换机的端口速率为1 Gb/s。测试仪的发端发出的流量经过STSN域交换机的转发与FlexE网络的承载,最终跨越广域网络到达DTSN域被测试仪的收端接收。测试仪配套软件能够实时测量时延、抖动和丢包率等性能参数。
为契合未来远程协作及其他场景的需求,应用验证测试部分选取了主从电机协同与工业机器视觉2个应用场景,测试拓扑分别如图8图9所示。在主从电机测试中,可编程逻辑控制器(Programmable Logic Controller,PLC)产生的控制信号一方面直接传输至主电机,另一方面经过广域网的传输到达从电机,测试过程中观察主从电机的运行情况和同步状况。在工业机器视觉测试中,机器视觉系统的相机将需要处理的图像经过广域网传输到对端的服务器上进行计算,服务器再将计算结果返回至机器视觉系统控制端,以控制机械臂在指定位置进行作业。
测试仪在测试过程中向广域网中注入背景流,以测试网络的确定性保障能力。主从电机协同业务流的带宽需求约为20 Mb,测试仪生成的背景流的带宽设置为50~70 Mb,VLAN ID设置为100。机器视觉业务流的带宽需求约为500 Mb,测试仪生成的背景流的带宽设置为500~700 Mb,VLAN ID设置为100。
主从电机测试与工业机器视觉测试过程中的FlexE网络切片参数配置分别如表1表2所示。所有的业务流均无VLAN,测试中通过改变背景流的VLAN ID来控制背景所注入的切片。测试中所有TSN交换机的门控队列均配置为打开状态,以确保业务流到达交换机时能够被立即转发。
测试仪满带宽(速率1 Gb/s)发送数据,广域端到端确定性网络的性能测试结果如图10图11所示。可以看出帧长度在128~1 518 Byte时,网络端到端时延可以始终保持在17 ms以内。随着数据帧大小的增加,其端到端平均时延也不断增加,端到端最大抖动逐渐减小,平均抖动始终保持在5 μs以内。
远程电机协同和工业机器视觉的测试验证结果如图12图13所示,分别对模拟业务流量的传输性能和实际设备运行状态在不同情况下进行了对比。在远程电机协同测试中,分别向广域网注入负载为50、60、70 Mb/s的背景流。由图12可以看出,无确定性保障时随着背景流负载的增加,业务流平均时延、抖动逐渐和丢包率不断增加。当背景流为70 Mb/s时,平均时延接近60 ms,平均抖动超过200 μs,业务数据的丢包率超过40%。此时,观察设备运行状态,发现主从电机逐渐开始同步失败,直至最终无法正常启动。开启TSN-over-FlexE确定性保障后,由于提前进行了调度规划与切片隔离,业务的平均时延和抖动不受背景流的影响,平均时延始终保持在20 ms以内,平均抖动与无确定性保障相比降低至原先的1%以内,业务数据的丢包率始终为0。此时,电机不受背景流影响,始终能正常运行,主从电机始终能够保持同步。类似地,在工业机器视觉测试中,分别向广域网注入负载为500、600、700 Mb/s的背景流。由图13可以看出,在无确定性保障的情况下,业务传输性能受到背景流的严重影响。观察实际设备运行状态,发现随着背景流负载的增加,图片传输质量逐渐变差,严重影响了服务器对图片内容的识别与计算。开启TSN-over-FlexE确定性保障后,业务传输的时延、抖动和丢包率性能提升显著,观察实际设备运行状态,发现工业机器视觉系统始终保持正常运行。
上述测试结果说明,所提TSN与FlexE融合的确定性广域网络能够通过资源预留、切片隔离等方法保障业务端到端传输时延、抖动的稳定性,提供零丢包的业务承载能力,在未来广域端到端确定性传输场景有着良好的应用前景。
常用的工业TSN交换机支持多种时钟同步协议,能够与FlexE设备良好兼容。TSN能够提供精确的时间同步和确定性的网络延迟,FlexE可以实现灵活的带宽分配和网络切片,二者结合可以满足工业自动化控制、智能电网等应用场景对实时性和可靠性的需求。随着网络业务的不断丰富,TSN+FlexE解决方案可以实现混合优先级业务流量的一体化传输,满足不同业务的服务质量要求。此外,FlexE能够动态调整网络带宽,适应业务与流量的动态变化,大大提高网络的灵活性。
然而,该方案也存在一些局限性。首先,该方案基于物理层与数据链路层技术,对于高层协议的支持不够完善,限制了其在复杂网络环境中的应用范围;其次,该方案需要在网络中部署大量的设备及控制器,且对控制器之间的交互与计算能力要求较高,导致了较高的实施成本,不太适合预算有限的小型企业使用;最后,业务的传输性能与流量大小、周期和TSN门控列表之间的适配程度密切相关,这意味着一些非周期性的业务可能难以实现最佳的传输效果。
端到端确定性传输保障是所有确定性网络技术的最终目标,当前的确定性网络技术百花齐放,如何实现不同层级确定性技术的协同配合是实现确定性网络应用落地的关键。本文提出了一种FlexE与TSN融合的确定性网络架构,为工厂或园区的跨广域网络的确定性通信提供解决思路。搭建了测试床模拟实际工业应用场景,对该架构进行了测试验证,结果表明所提出的广域端到端确定性网络能够满足上述应用对网络的确定性保障需求。确定性网络技术的融合已成为一种必然趋势,未来将探索更多类型确定性技术的协同配合方案,以丰富广域端到端确定性网络架构。
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2025年第51卷第5期
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doi: 10.3969/j.issn.1003-3114.2025.05.023
  • 接收时间:2024-12-16
  • 首发时间:2026-04-17
  • 出版时间:2025-09-18
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  • 收稿日期:2024-12-16
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    1.北京邮电大学 信息与通信工程学院,北京 100876
    2.深圳中广核工程设计有限公司,广东 深圳 518100
    3.中国信息通信研究院,北京 100191
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2种不同金属材料的力学参数

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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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