机载时间触发光网络的设计与实时性分析

doi:10.13700/j.bh.1001-5965.2016.0925

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摘要波分复用光（WDM）网络是目前较好的航空电子网络解决方案之一，具有高带宽、强灵活性、对协议和比特率透明、强扩展性等优点。但在实时性方面，WDM网络的消息传输存在不确定性，无法满足未来航空电子网络对于时间关键消息强实时性保障的要求。本文将时间触发机制引入WDM网络，设计了时间触发航空电子WDM （TTAWDM）网络的体系结构，包含协议栈、消息类型、调度流程等。TTAWDM用时刻调度表规划时间关键性消息的传输，保障消息传输过程和传输延时的确定性，以满足强实时性要求。在TTAWDM体系结构设计的基础上分析了网络消息的实时性，基于网络演算推导出速率限制消息的延时上界计算方法，并构造仿真实验展示了TTAWDM对于强实时性保障，同时验证了延时上界计算方法的有效性。

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	熊颖
	陈俊延
	何锋
	熊华钢
	刘成

关键词 ：时间触发, 波分复用(WDM)网络, 体系结构, 实时性, 网络演算

Abstract：Wavelength division multiplexing (WDM) network is featured by almost unlimited bandwidth potential, great flexibility, strong expandability and transparent to protocol and bit rate, which makes it a good choice for avionics systems. However, the end-to-end delay of message transmitted on WDM avionics is uncertain on the real-time performance. WDM network cannot ensure determinacy for the time-critical message transmitted on future avionics network. This paper introduces time-triggered mechanism to WDM network and proposes the architecture of time-triggered avionics WDM (TTAWDM) network, including protocol layer, data format, scheduling procedure, etc. The time-triggered mechanism can process a statically configured communication schedule for time-critical message, which can ensure determinacy for the transmission process and end-to-end delay of message, and can meet real-time requirements. Then the real-time property of messages is analyzed based on the architecture design of TTAWDM, and based on network calculus, the calculation method of upper bound delay of rate-constrained messages is given. Finally, a simulation experiment of TTAWDM is conducted, and the results show that TTAWDM can be a totally deterministic network for time-critical messages and the calculation method of upper bound delay is effective.

Key words： time-triggered wavelength division multiplexing (WDM) network architecture real-time network calculus

收稿日期: 2016-12-08 出版日期: 2017-04-07

PACS:	TP393
	V247

基金资助:国家自然科学基金（61301086）

通讯作者: 陈俊延 E-mail: chenjy83@hotmail.com

作者简介: 熊颖,女,博士研究生。主要研究方向:航空电子光网络、实时性网络、时间触发网络;陈俊延,男,博士。主要研究方向:航空电子网络、通信网络理论与技术;何锋,男,博士,讲师。主要研究方向:航空电子综合、实时性网络;熊华钢,男,博士,教授,博士生导师。主要研究方向:通信网络理论与技术、航空电子信息综合和超宽带通信;刘成,男,博士,高级工程师。主要研究方向:通信网络理论与技术、网络与信息安全技术。

引用本文:

熊颖, 陈俊延, 何锋, 熊华钢, 刘成. 机载时间触发光网络的设计与实时性分析[J]. 北京航空航天大学学报, 2017, 43(12): 2466-2472.
XIONG Ying, CHEN Junyan, HE Feng, XIONG Huagang, LIU Cheng. Design and real-time analysis of time-triggered airborne optical network. JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2017, 43(12): 2466-2472.

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http://bhxb.buaa.edu.cn/CN/10.13700/j.bh.1001-5965.2016.0925 或 http://bhxb.buaa.edu.cn/CN/Y2017/V43/I12/2466

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