Research on QoS of new generation of railway mobile communication network

doi:10.16265/j.cnki.issn1003-3033.2022.S1.0139

Abstract

Abstract:

QoS is one of the important measurement standards for the planning, construction, operation and maintenance of railway mobile communication networks. Therefore, it is necessary to build a QoS architecture that adapts to the technical characteristics and evolving business requirements of the new generation of railway mobile communication networks. This paper summarizes the basic concept, influencing factors and quantitative methods of QoS and QoE, discusses the QoS model and the mapping method of railway service priority in IP bearer networks, and elaborates on the delay, reliability and other QoS parameters and mapping methods in the wireless access network and core network. In addition, towards the future application paradigm of VoIP, the requirements of end-to-end call sessions and voice quality are proposed. The results show that the key QoS parameters and mapping method proposed in this paper can build the QoS system for the new generation of railway mobile communication network, thereby improving the level of network construction, evaluation and maintenance.

Key words: new generation, railway mobile communication, quality of service (QoS), quality of experience(QoE), voice over internet protocol(VoIP)

WANG Kaifeng, LI Hui, ZUO Zihui, BAI Xiaonan. Research on QoS of new generation of railway mobile communication network[J]. China Safety Science Journal, 2022, 32(S1): 114-119.

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References 17

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本地优先级	主要承载业务
EF	会议电视等实时交互性强的业务,GPRS等行车相关业务
AF4	电力数据采集与监视控制系统等控制类业务,旅客服务信息系统等可能影响运输服务的业务
AF3	行车设备监控系统,通信系统网管等监测类业务
AF2	实时性交互要求相对较高的信息系统业务
AF1	办公系统等实时交互要求一般的信息系统业务,及突发流量高的视频监控等业务
BE	其他业务

5QI	资源类型	优先级	典型业务
65	保证比特率	EF	行车安全数据、铁路紧急呼叫、行车相关调度语音通信、应急语音通信
3		CS4	运营及维护控制数据
1		AF3	行车信息数据、应急数据、运营及维护告警数据、行车安全视频、应急视频
66		AF3	非行车相关调度语音、运营及维护语音
67		AF4	应急视频、调度视频、运营及维护视频
70	非保证比特率	AF2	调度短数据、铁路宽带集群通信用户普通短数据和用户文件数据
69		CS6	铁路宽带集群通信信令、行车安全数据传送默认承载
9		BE	其他默认承载
6		AF2	运营及维护检测监测数据、运营及维护车载远程数据更新、运营及维护作业指导
6	8	AF2	运营及维护检测监测数据、运营及维护车载远程数据更新、运营及维护作业指导	AF1	运营及维护视频

可靠性	类别
可靠性	会话	交互式	流式	背景
容错	会话语音和视频	语音信息	流式音频和视频	传真
不容错	远程登陆、交互式游戏	电子商务、网页浏览	文件下载、静图、传呼	电子邮件到达通知

QoS参数	系统需求	参数值
时延/ms	非常低	≤10
	低	≤100
	一般	≤500
	尽力而为	>500
可靠性/%	非常高	99.999 9
	高	99.9
	一般	99
会话建立时间/s	立即	<1
会话建立时间/s	一般	<3

端到端 QoS指标	定义	移动- 移动	移动- 固定
注册成功率/%	终端成功注册到IP多媒体系统的概率	99.9	99.9
服务可用性/%	语音会话建立失败概率	99	99
拨号后延迟/ s	网络收到主叫方呼叫请求至收到被叫方忙音、振铃音或应答信号的时间	3.5	4
语音质量	对语音质量的数字度量	4	3.1
口到耳(端到端)延迟/ms	语音信号从讲者的嘴到听者的耳所需的时间	400	400
呼叫掉线率/%	未正常结束的呼叫比率	2	2