Supported by the National Defence Pre-Research Project of China under Grant No.2000J6.7.1.DZ0206 (国防科技预研基金); the Project of the "Tenth Five-Year-Plan" of China under Grant No.41315040106 (国家"十五"项目)
随着实时计算技术日益广泛应用于航空航天、国防及交通运输等安全关键领域,多类型的同步实时、异步实时和非实时网络传输需求给现场网络提出了新的目标和挑战,其中安全关键实时网络的实现方式与调度分析是需要解决的关键问题.在分析、总结现有COTS网络技术不足之处的基础上,基于事件触发与时间触发,提出了一种基于Ethernet技术的高可靠实时通信协议E&TTE(event- and time-triggered Ethernet),使实时网络不但具有较高的灵活性,而且具有较好的可预测性.为证明E&TTE协议的合理性与可行性,建立了网络调度模型,进行了全局调度分析,并通过具体实例进行了例证.E&TTE协议的提出,满足了安全关键实时网络的多种传输需求,同时也可广泛应用于工业现场控制网络.
As the applications of real-time computing technology are becoming more and more popular in many safety critical domains such as avionics, national defense and transportation systems, field network faces new requirements and challenges because of the coexistence of different kinds of synchronous real-time, asynchronous real-time and non-real-time communication requirements. The realization approach and schedulability analysis of safety critical real-time network are very crucial because of giving a way to solve the problem. Firstly, the shortcomings of the existing COTS network such as Ethernet are described. And then, a high reliable and real time Ethernet communication protocol known as E&TTE (event- and time-triggered Ethernet) based on event- and time-triggered approach is presented. The E&TTE based real time network is flexible, and the communication time is predictable. At the same time, the network scheduling model is constructed, and the global schedulability analysis is done in this paper. The rationality and feasibility of E&TTE protocol is also proven by a concrete example. With E&TTE protocol, the diverse requirements of safety critical real time network can be met better. In addition, the E&TTE protocol can be widely applied to the field control network of ordinary industry systems.