面向地铁乘客信息系统的以太网环网协议设计与应用

发布时间：2018-05-03 15:08

本文选题：乘客信息系统 + 以太网环网　；参考：《中国科学院大学(中国科学院工程管理与信息技术学院)》2017年硕士论文

【摘要】：乘客信息系统,简称PIS(Passenger Information System),是现代轨道交通中越来越重要的系统之一。通过PIS系统,能够让地铁乘客在乘车过程中,得到通知公告、实时消息等,也能够让司机更好地掌握列车乘客的实时动态。车载PIS系统主要包括广播通信子系统、信息显示和媒体播放子系统和CCTV视频监控子系统。随着媒体、监控信息的数字化、高清化,车载PIS系统需要越来越大的传输带宽。近些年来,以太网技术飞速发展,已经成为PIS系统传输数据的主流链路层协议,搭建冗余型网络结构是应用于PIS系统的以太网交换机的必要条件。在车载PIS系统中,以太网链路层多数采用链路聚合、单环形网络提供保护。根据IEC61375-3-4协议中关于ECN(Ethernet Consist Network)网络拓扑的介绍发现,以太网梯形环网拓扑的冗余保护性更高,为系统链路层提供了更好的可靠性。本文设计了一种应用于车载PIS系统的以太网环网协议,该协议既可以搭建单环网拓扑,也可以搭建梯形环网拓扑。并且基于二层以太网交换机平台,实现了该环网协议。本论文完成的主要工作如下:(1)设计一种环网协议,支持单环形拓扑网络和梯形环网拓扑;(2)实现该环网协议,且网络收敛时间小于50ms;(3)将该环网协议应用在车载PIS系统中。本文设计实现了以太网环网协议,支持搭建单环拓扑网络和梯形环拓扑网络。当链路变化时,以太网网络的收敛时间在50ms之内,大大地提高了系统链路层的冗余保护性,为日益重要的车载PIS系统提供更加可靠的以太网网络连接。
[Abstract]:Passenger Information system (PIS(Passenger Information system) is one of the more and more important systems in modern rail transit. Through the PIS system, the subway passengers can be notified, real-time messages and so on in the process of riding, and the driver can also better grasp the real-time dynamics of train passengers. Vehicle PIS system mainly includes broadcast communication subsystem, information display and media playback subsystem and CCTV video monitor subsystem. With the digitalization and high definition of the media and monitoring information, the on-board PIS system needs more and more bandwidth. With the rapid development of Ethernet technology in recent years, Ethernet has become the mainstream link layer protocol for data transmission in PIS systems. Building redundant network structure is a necessary condition for Ethernet switches used in PIS systems. In on-board PIS system, the Ethernet link layer mostly adopts link aggregation, and the single ring network provides protection. According to the introduction of ECN(Ethernet Consist Network network topology in IEC61375-3-4 protocol, it is found that the redundancy protection of Ethernet trapezoidal ring network topology is higher, which provides better reliability for the system link layer. In this paper, an Ethernet ring network protocol for vehicular PIS system is designed. This protocol can not only build a single loop topology, but also a trapezoidal ring network topology. And based on layer 2 Ethernet switch platform, the ring network protocol is implemented. The main work of this thesis is as follows: (1) A ring network protocol is designed, which supports single ring topology network and trapezoidal ring network topology / 2). The network convergence time is less than 50 Ms / 3) and the ring network protocol is applied to the vehicle PIS system. In this paper, the Ethernet ring network protocol is designed and implemented to support the construction of single ring topology network and trapezoidal ring topology network. When the link changes, the convergent time of Ethernet network is within 50ms, which greatly improves the redundancy protection of system link layer, and provides more reliable Ethernet network connection for the increasingly important vehicular PIS system.
【学位授予单位】：中国科学院大学(中国科学院工程管理与信息技术学院)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.11;U270.38

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