铁路客运信息交互系统双服务通道传输协议的研究

铁路客运信息交互系统是采用移动通信网络作为数据通道的业务系统,由于移动链路存在丢包和断线等不稳定因素,为保证业务数据的完整性和安全性,必须采用有效的传输协议,并实现科学的应用和控制.文章从传输协议特点、应用类型、链路检测与协议切换等方面,研究铁路客运信息交互系统的双服务通道传输协议.     

令牌总线CircLink在列控系统中的应用

主要研究基于改进型令牌传递协议的现场总线CircLink在列车运行控制(ATC)系统车载设备中的应用.在列控系统中引入新型令牌总线CircLink,对于提高其通信性能有着重要的意义.给出车载CircLink总线的应用及工作原理,深入剖析新型令牌总线CircLink和传统令牌总线ARCNet的令牌传递协议,得出CircLink在协议上优于ARCNet的结论,为CircLink在列车控制系统以及更广泛领域中的应用提供了有力的依据.     

Nonlinear finite-time consensus-based connected vehicle platoon control under fixed and switching communication topologies

This paper proposes nonlinear consensus-based control strategies for a connected vehicle (CV) platoon under different communication topologies. In particular, pinning control based consensus protocols are proposed by incorporating the car-following interactions between CVs under fixed and switching communication topologies. The finite-time stability and consensus of the proposed protocols are rigorously analyzed using the LaSalle’s invariance principle and Lyapunov technique. The theoretical analyses investigate the impacts of communication topology on convergence and stability of CV platoon. This study conducts numerical experiments for a CV platoon under four scenarios: (i) Fixed communication topology with time-invariant leader, (ii) fixed communication topology with time-variant leader, (iii) switching communication topology with time-invariant leader, and (iv) switching communication topology with time-variant leader. Simulations results illustrate the effectiveness of the proposed protocols in terms of convergence time and stability with respect to position and velocity profiles.     

基于主动路由器的组播拥塞控制策略

介绍组播拥塞控制的相关概念;在分析几种较为典型的组播拥塞控制协议的优缺点的基础上,提出基于主动路由器的组播拥塞控制方案,在解决组播拥塞控制方面提出展望。     

短波广域网路由协议研究

针对短波信道的低速率、高误码率的特性,对以OLSR为代表的先应式路由协议、AODV为代表的反应式路由协议以及无线地址解析路由协议（WARRP）进行介绍。着重阐述了WARRP的特点和应用,最后针对不同结构的HFWAN提出适合的路由协议。研究结果可为短波广域网路由协议的设计提供参考。     

双向转发检测技术在铁路数据通信网中的应用

铁路数据通信网用户侧设备采用双上行静态路由协议方式接入时,由于接入路由器与用户侧设备间可能存在非直连链路,两侧端口无法准确感知链路变化情况,会导致链路切换无法生效.为此,应用双向转发检测(BFD)技术,可解决非直连链路倒换端口无法感知链路变化问题.     

基于TIC-2000型通用控制器的机务检测试验设备的网络

介绍了TIC-2000型通用控制器的原理、结构及特点,并简要地阐述了基于该控制器的机务检测与试验设备网络的实现方法,提出了当前及今后机务检测与试验设备的设计和制造的标准化问题。     

基于网络中心战的精确时间同步技术

在分析常用授时技术的基础上,阐述了基于网络中心战战场的时间同步技术、精确时间体系结构、计算机时钟同步技术。并对各种时间获取及同步技术原理作了说明,能在一定程度上解决网络中心战条件下精确时间同步面临的部分问题。     

A Stream Control Transmission Protocol Based OAM System of 3G Cellular Network

OAM （Operations, Administration and Maintenance） system is a very important component of 3G cellular network. In order to acquire overall management, fast response and steady operation, an SCTP （Stream Control Transmission Protocol） based OAM, i. e. , SOAM system was proposed. SOAM implements new characters of SCTP such as multi-stream, enforced SACK and heartbeat mechanism on its transport layer. These characters help SOAM decrease the message transmission delay and accelerate the link failure detection. Besides, a new component named SOAM agent was introduced to improve the operation efficiency of SOAM. The experimental results prove the proposed SOAM system achieves better performance on signaling transmission compared with conventional TCP based OAM system.     

Improving Mobility Management for All-IP Radio Heterogeneous Network Using SCTP

IntroductionFuture mobile communication network willconsist of multiple traffics and access technologies.It is to certainty a radio heterogeneous network(RHN) because none of the current networks canprovide ubiquitous coverage and all-around ser-vices[1]. Future mobile terminal will be multi-modethat maintains connectivity to different radio accesspoints, so RHN should be scalable and support theevolution and upgrade of individual network ele-ments. All-IP architecture is an inevitable way…