AVB网络流量整形帧模型端到端延迟计算

李二帅; 何锋; 熊华钢

doi:10.13700/j.bh.1001-5965.2016.0539

AVB网络流量整形帧模型端到端延迟计算

doi: 10.13700/j.bh.1001-5965.2016.0539

北京航空航天大学电子信息工程学院, 北京 100083

基金项目:

国家自然科学基金 61301086

中央高校基本科研业务费专项资金 YWF-15-GJSYS-055

详细信息

作者简介:
李二帅  男, 硕士研究生。主要研究方向:实时网络

何锋  男, 博士, 讲师。主要研究方向:航空电子综合、实时调度、实时网络

熊华钢  男, 博士, 教授, 博士生导师。主要研究方向:航空电子综合、机载网络

通讯作者:
何锋, E-mail:robinleo@buaa.edu.cn

中图分类号: TP393
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出版历程
- 收稿日期: 2016-06-22
- 录用日期: 2016-11-04
- 网络出版日期: 2017-07-20

End-to-end traffic latency computation using frame shaping model in AVB network

School of Electronic and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

Funds:

National Natural Science Foundation of China 61301086

the Fundamental Research Funds for the Central Universities YWF-15-GJSYS-055

More Information

Corresponding author: HE Feng, E-mail: robinleo@buaa.edu.cn

摘要

摘要:
音视频桥接技术（AVB）以传统以太网为基础，通过基于信用量的整形（CBS）算法进行流量整形，提供了音视频流确定性传输的基础保障。在CBS流模型的延迟分析计算基础上，考虑了AVB网络中数据帧实际排队和调度的离散特性，提出了一种改进的CBS帧模型来计算音视频流量的排队传输延迟，并推导了帧模型下最坏延迟计算公式。采用典型的车载网络应用场景对2种模型进行演算验证，结果表明：同流模型相比，CBS帧模型中得到的端到端延迟更小，显示出更好的紧性评估效果，同时这种紧性评估在针对低优先级流量的延迟分析时，差异会更加显著。
- 音视频桥接技术（AVB） /
- 实时性 /
- 帧模型 /
- 端到端延迟 /
- 流模型
Abstract:
Audio video bridging (AVB) Ethernet is an available Ethernet-based solution for audio and video stream transmissions within embedded networking context, in which credit-based shaping (CBS) algorithm is defined to guarantee the end-to-end latency performance according to stream models. When considering the discrete characteristics of frame queuing and scheduling behavior in an actual networking scenario, an improved frame model CBS was proposed to replace the stream model CBS algorithm. According to this new model, the worst-case transmission latency was deduced by eliminating non-schedulable traffic in the network. A representative in-vehicle application scenario was established to verify the end-to-end latency performance of the frame model CBS. The results indicate that the frame model CBS can obtain a better end-to-end latency evaluation than the stream model CBS. Especially, the tightness of frame model CBS is clearer for the lower priority AVB traffics within the whole AVB networks.
- audio video bridging (AVB) /
- real-time /
- frame model /
- end-to-end latency /
- stream model

HTML全文

图 1 AVB中流量排队及转发过程

Figure 1. Queuing and forwarding for AVB streams

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图 2 CBS算法

Figure 2. CBS algorithm

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图 3 流模型下的CBS

Figure 3. CBS based on stream model

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图 4 帧模型下的CBS

Figure 4. CBS based on frame model

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图 5 网络拓扑模型^[13]

Figure 5. Network topology model^[13]

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图 6 端到端延迟结果对比

Figure 6. Comparison of end-to-end latency results

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表 1 流量配置表

Table 1. Traffic configuration

消息类型	带宽/(Mbit·s^-1)	最大帧长/byte	突发量/byte
SR_A(CS)	0.512	64	640
SR_B(VS)	16.97	1 522	70 012
BE(MVS)	15.70	1 522	65 446

下载: 导出CSV

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