时间敏感网络的预测式混合传输技术Predictive Scheme for Mixed Transmission in TSN

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时间敏感网络的预测式混合传输技术

李宗辉1), 杨思琪 1), 张浩明 1)*, 王清 1), 喻敬海 2), 邓仰东 3), 万海 3), 贺飞 3)

1) (北京交通大学 计算机与信息技术学院 , 北京 100044)
2) (中兴通讯股份有限公司 , 江苏 南京 210013)
3) (清华大学 软件学院 , 北京 100084)

摘要 : 时间敏感网络是工业互联网基础设施转型升级的重要研究方向。作为控制网络和信息网络融合的产物，既能满足工业控制的实时性和确定性，又能兼容以太网 实现工业控制数据和以太网数据的混合传输 本文对现有突发与周期性业务流 的 混合传输技术进行了系统总结并分析了它们的不足 提出了突发与周期性业务流 的 预测式混合传输机制。该机制的核心思想是利用时间敏感网络中 时间触发传输机制的可预测性 去进一步降低混合传输的带宽损失。本文构建了预测式混合传输机制的概率模型，并证明了该机制的带宽 损失优于原混合传输机制。最后，基于概率模型，本文仿真验证了预测式混合传输机制的期望带宽损失，相比于原混合传输机制，下降了 80%.

关键词: 时间敏感网络 ; 802.1Qbv; 802.1Qbu; 保护带策略 ; 帧抢占策略



Predictive Scheme for Mixed Transmission in Time-Sensitive Networking

LI Zong-Hui1), YANG Si-Qi1), ZHANG Hao-Ming1), WANG Qing1), YU Jing-Hai2), Deng Yang-Dong3), Wan Hai3), He Fei3)

1) (School of Computer and Information Technology, Beijing Jiaotong University, Beijing China 100044)
2) (ZTE Corporation, Nanjing China 210013)
3) (Software School, Tsinghua University, Beijing China 10084)


Abstract: Time-sensitive network (TSN) is an important research area to update infrastructure of industrial internet of things. As a product of the integration of OT and IT, it can not only meet the real-time and deterministic nature of industrial control, but also be compatible with Ethernet to support mixed transmission of industrial control data and Ethernet data. This paper systematically summarizes and analyzes their shortcomings for the existing mixed transmission technology of the bursty flows and the periodic flows. To conquer these shortages, this paper proposes a predictive mixed-transmission mech of the bursty flows and the periodic flows. Its core idea is to use the predictability of time-triggered transmission of TSN to further reduce bandwidth loss of the previous mixed-transmission methods. This paper formalizes the probabilistic model of the predictive mixed transmission mechanism and proves that the proposed mechanism can effectively reduce the loss of bandwidth. Finally, based on the formalized probabilistic model, we simulate the bandwidth loss of the proposed mechanism. The results demonstrate that compared with the previous mixed-transmission method, the bandwidth loss of the proposed mechanism achieves 80% reduction.

Key words: Time-sensitive networking; 802.1Qbv; 802.1Qbu; guard band strategy preemption strategy

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关键词：Transmission Predictive Mission predict Scheme