城市轨道交通信号系统有线通信网络的服务质量策略
许永顺
QoS Strategies for Wired Communication Networks in Urban Rail Transit Signaling System
XU Yongshun
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作者信息:上海地铁维护保障有限公司通号分公司，200235，上海
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Affiliation:Telecom & Signal Branch, Shanghai Metro Maintenance Support Co., Ltd., 200235, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.11.012
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中图分类号/CLCN:U231.7
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栏目/Col:研究报告
摘要:
［目的］城市轨道交通信号系统的数据流量增加，数据类型多样化，对可靠性、实时性和安全性提出更高要求，有必要深入研究信号系统有线通信网络的QoS（服务质量）策略。［方法］基于信号系统的实际数据和有线通信网络架构，从网络带宽、各业务带宽需求、涉及的数据终端等角度，分析了信号系统中ATP（列车自动防护）及ATS（列车自动监控）子系统骨干网的业务需求。从有线通信网络的传输能力、数据处理效率和故障容错能力等方面，提出了一套优化的信号系统QoS实施策略，并通过测试来验证该策略的实现效果。［结果及结论］QoS策略通过启用RSVP（资源预留协议）来建立通信会话前的资源预留；配置相应的DSCP（差分服务代码点）参数，以保证每个业务终端的带宽使用均为可控的。在骨干网交换机上基于IEEE802.1p协议对业务进行优先级处理。仿真测试结果表明，QoS策略能在极端流量情况下有效限制单个终端的流量，避免了由于单个终端发生故障而导致的应用不可用情况，有效提升了信号系统的质量和性能，可确保城市轨道交通信号系统能安全、高效地运行。
Abstracts:
［Objective］ With the increase in data traffic and diversification of data types in urban rail transit signaling systems, higher demands are placed on reliability, real-time performance, and security. It is necessary to thoroughly investigate QoS (quality of service) strategies for wired communication networks in signaling system. ［Method］ Based on the actual data from signaling systems and the architecture of wired communication networks, an analysis is conducted on the service requirements of ATP (automatic train protection) and ATS (automatic train supervision) subsystem backbone networks in the signaling system, from perspectives of network bandwidth, bandwidth requirements of each service, and involved data terminals. Considering the transmission capacity, data processing efficiency, and fault tolerance of wired communication networks, an optimized QoS implementation strategy for the signaling system is proposed and tested to validate its effectiveness. ［Result & Conclusion］ The QoS strategy employs RSVP (resource reservation protocol) to reserve resources before establishing communication sessions, and configures appropriate DSCP (differentiated services code point) parameters to ensure controllable bandwidth usage for each service terminal. Priority processing of services on the backbone network switches is based on the IEEE 802.1p protocol. Simulation test results show that the QoS strategy effectively limits the traffic of individual terminals under extreme traffic conditions, preventing application unavailability caused by single terminal failure. This significantly improves the quality and performance of the signaling system, ensuring the safe and efficient operation of urban rail transit signaling systems.
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