基于以太网的实时通信协议的研究与设计

发布时间：2018-04-04 21:50

本文选题：实时　切入点：以太网　出处：《东北大学》2014年硕士论文

【摘要】：近年来,伴随着计算机的发展及其应用的普及,与其运用而生的实时系统已经在工业、能源、交通和国防等各个领域发挥极其重要的作用,并且产业了大量实时系统的科学研究和科学试验。同时以太网因其成本低廉、结构简单,容性、稳定性和可靠性较高,带宽也易于扩展等诸多优点,受到人们的极大关注。尽管以太网本身所采用的介质访问控制协议,其存在不可预见的特性,限制它应用于实时通信领域,如何实现以太网终端之间实时的、可靠的数据通信,就成为了关键。在这种背景下本文设计并建立了基于以太网络的实时通信传输模型。同时完成新的实时通信传输协议,使此协议不仅完全兼容现有的通信协议,并且又全面支持了实时通信。为了满足网络的实时性要求,保证各个节点的实时性的访问仲裁过程以及保证整个网络的实时性的传输控制过程,两个过程有机地组合在一起,最终保证通信协议具有良好的实时性。本文主要从发送队列中待发数据之间的优先级问题着手来提高网络实时性。分析网络适配器在发送数据包时寄存器的变化情况,并剖析缓冲页面的读取顺序。提出修改数据帧格式和数据的接收、发送流程的方法,使实时数据自身附带一个时间戳域,以反映对时间的限制信息,使传输协议能够根据数据的时间戳对数据进行处理,对接收的数据进行相应的优先级选择,使实时的数据能先于非实时数据得到发送上的优先,从而满足数据的实时要求。
[Abstract]:In recent years, with the development of computers and the popularization of their applications, real-time systems have played an extremely important role in industry, energy, transportation and national defense.And industry a large number of real-time systems of scientific research and scientific experiments.At the same time, Ethernet has attracted much attention because of its low cost, simple structure, high stability and reliability, easy to expand bandwidth and so on.Although the medium access control protocol adopted by Ethernet itself has unpredictable characteristics, it is limited to be applied in the field of real-time communication. How to realize real-time and reliable data communication between Ethernet terminals becomes the key.Under this background, this paper designs and establishes a real-time communication transmission model based on Ethernet.At the same time, a new real-time communication protocol is implemented, which not only fully compatible with the existing communication protocols, but also supports real-time communication.In order to meet the real-time requirements of the network, to ensure the real-time access to the arbitration process of each node and the real-time transmission control process of the entire network, the two processes are organically combined together.Finally, the communication protocol is guaranteed to have good real-time performance.In order to improve the real-time performance of the network, this paper focuses on the priority problem between the outgoing data in the transmission queue.This paper analyzes the change of the register when the network adapter sends the data packet, and analyzes the read order of the buffer page.The method of modifying data frame format and data receiving and sending flow is put forward to make real-time data attach a time stamp field to reflect the limited information of time, so that the transmission protocol can process the data according to the time stamp of data.According to the priority of the received data, the real-time data can be sent first before the non-real-time data, so as to meet the real-time requirements of the data.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.11;TN915.04

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