Extending IEEE 802.1 AVB with time-triggered scheduling: A simulation study of the coexistence of synchronous and asynchronous traffic
Extending IEEE 802.1 AVB with time-triggered scheduling: A simulation study of the coexistence of synchronous and asynchronous traffic
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DOI：
10.1109/vnc.2013.6737589
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发表时间：
2013-12
期刊：
影响因子：
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通讯作者：
Philipp Meyer;T. Steinbach;Franz Korf;T. Schmidt
中科院分区：
文献类型：
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作者：
Philipp Meyer;T. Steinbach;Franz Korf;T. Schmidt
基于以太网的车载网络有望成为未来信息和娱乐领域应用的首选。然而，技术集成的车载网络的全部优势只有通过基于以太网的主干网才能获得回报，将多个汽车领域统一在一个基础设施中。如今，人们对 IEEE 802.1 音频/视频桥接 (AVB) 协议套件非常感兴趣，该协议套件在以太网中提供端到端性能保证。但对于汽车控制流量的严格计时要求来说，这些保证太弱了。具有同步时间触发流量的以太网 AVB 扩展可以克服这些限制。在本文中，我们通过实验以简单的方式将时间触发的消息添加到 AVB 基于信用的整形器中，研究同步和异步流量的共存。基于模拟和分析评估，我们量化了此类集成概念对合理设计范围的影响。我们的结果证明了具有并发 AVB 和时间触发消息的整形策略的可行性，但显示了调度设计对异步 AVB 流的重大影响。根据我们的研究结果，我们提供了可将车载应用的端到端网络性能提高 100% 以上的配置建议。
In-car networks based on Ethernet are expected to be the first choice for future applications in the domain of info-and entertainment. However, the full benefit of a technologically integrated in-car network will only become rewarding with an Ethernet-based backbone, unifying several automotive domains in a single infrastructure. Today, there is remarkable interest in the IEEE 802.1 Audio/Video Bridging (AVB) protocol suite, that provides end-to-end performance guarantees in Ethernet networks. But for the strict timing requirements of automotive control-traffic, these guarantees are too weak. An extension of Ethernet AVB with synchronous time-triggered traffic can overcome these limitations. In this paper, we investigate the coexistence of synchronous and asynchronous traffic by experimentally adding time-triggered messages to the credit-based shaper of AVB in a straightforward way. Based on simulations and analytical evaluations, we quantify the impact of such integration concepts for a reasonable design range. Our results demonstrate the feasibility of a shaping strategy with concurrent AVB and time-triggered message, but show a significant impact of the schedule design on the asynchronous AVB streams. Based on our findings, we provide recommendations for configurations that can improve end-to-end network performance for in-car applications by over 100%.