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在分析地铁公众通信系统的组网方式和信号源引入方案的基础上,研究了地铁公众通信系统的组成;针对地铁空间小的现状,引入分布式天馈系统POI对各种信号进行整合;最后给出了地铁公众通信系统的组网方案,并对公众通信系统的覆盖方案进行了初步设计。 相似文献
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上海目前拥有地铁16条线,其中地下站点共191个,这些地下站点均属于封闭空间,对于消防现场灭火救援中的通信提出了极大的挑战。根据消防三级组网的通信需求,在地下封闭空间内需组建三级现场战斗网。文章旨在对地铁消防无线通信系统的组网方案进行分析,在总结现有实践经验的基础上提出今后的发展方向,为今后在处置地下空间灭火救援行动中的无线通信组网提供参考。 相似文献
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1城市地铁通信系统概况 近年来,城市轨道交通行业发展迅猛,国内各大城市陆续建设城市地铁,地铁已经是一些大中型城市不可缺少的交通工具。地铁系统中通信系统是地铁工程运营指挥、企业管理、服务乘客和传递各种信息的网络平台,系统应具有先进性、开放性、可靠性、易扩充性、组网灵活性等特点,能传递语音、数据、图像等各种信息的综合业务数字通信网。 相似文献
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在分析MSTP、OTN、ATM、IP、RPR等传输网络技术的基础上,结合城市地铁、轻轨通信网的特点和需求、探讨了地铁、轻轨通信的各种传输组网方案。 相似文献
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说明了建设地铁通信传输网络的必要性、网络的组成和对该网络的总体要求,结合哈尔滨市地铁一期工程的实际情况提出了通信传输网络的容量需求及其具体要求,探讨了3种通信传输网络的组网方案并进行了比较,指出哈尔滨地铁通信传输网络系统的设计首先应考虑兼容性,其次要考虑中、远期的需求,技术的先进性、系统制式的生命周期和经济技术比,以及通信系统招投标的实际情况等,通过比较作出方案选择的决定. 相似文献
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目前城市轨道交通通信系统的传输网,主要采用MSTP、RPR、OTN三种方式。对这3种传输组网技术进行分析比较,认为MSTP+RPR组网方案可作为城市轨道交通通信传输网络的优选方案。 相似文献
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文章紧密围绕着光纤直放站的原理和应用为研究中心,对其组网方式、传输距离和冗余配置等具体的细节问题进行了论述,最后以实际项目地铁中光纤直放站的应用案例来进行论述.文章对于光纤直放站在地铁中的应用具有较好的理论指导意义和实际操作意义,对于地铁通信中的降本增效具有很好的示范效应,可以作为后续推广的依据. 相似文献
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光传输系统是地铁通信系统重要组成部分,目前国内地铁光传输系统大都是使用基于电路的MSTP和OTN系统,随着分组业务发展,基于电路的光传输系统已不适用于现状,本文对目前地铁通信光传输系统做了简要分析并对PTN系统做了简要介绍。 相似文献
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分析了通信城域网的体系结构。组网原则和组网要素,并根据某市城域网的发展特点和某市地铁网络,提出了一个基于核心层、接入层两层结构的某市城域网的系统设计方案。 相似文献
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Zhi-Wei Lin 《Communications Magazine, IEEE》2004,42(10):112-116
New York City transit's subway system is one of the largest and most complex mass transportation systems in the world. Because of the extensive subway system, an extensive communications network infrastructure is needed to allow for communications of the various subway services with the control centers to support mission-critical (and safety-critical) applications. The current network utilizes multilayer network technologies, including SONET, ATM, and IP (layer 2/3 device) layer networks. As a consequence of using these various technologies, extensive challenges are faced in trying to consolidate these separate networks into a single management view, simplifying (and automating) not only the provisioning aspects but also troubleshooting/fault management aspects of the network. Such automation will help to simplify network operations and allow for better handling and management of the reliability and availability of the network. To achieve this goal, various technologies were evaluated. Consideration is being given to multiprotocol label switching technology. MPLS offers the potential to help converge to a simpler networking model. In order to achieve this, certain capabilities must be available (e.g., the ability to quickly and automatically identify defects/failures and subsequently reroute around these failures). This article discusses the operational requirements for the MPLS network from the point of view of backbone networks that support a mass transportation system operator. 相似文献
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S. J. Ben Yoo Lei Liu Roberto Proietti Ryan P. Scott 《Photonic Network Communications》2014,28(1):19-33
This paper discusses architecture, protocol, technologies, systems, and networking testbed for software-defined elastic optical networking in temporal, spectral, and spatial domains. By exploiting the progress in elastic optical networking (EON) in temporal and spectral domains utilizing dynamic optical arbitrary waveform generation and measurement technologies, and by extending the EON concept into the spatial domain through the new orbital angular momentum-based spatial division multiplexing, we realize EON exploiting elasticity in temporal, spectral, and spatial domains (3D-EON). Routing, spectral, spatial mode, and modulation format assignment with fragmentation awareness as well as hitless defragmentation for high capacity, high quality of service, and resource-efficient networking will be pursued. OpenFlow-based 3D-EON testbed at UC Davis includes optical supervisory channel with optical performance monitoring for software-defined networking with an adaptive observe-analyze-act cycle. 相似文献
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Xingang Liu Kwanghoon Sohn Meikang Qiu Minho Jo Hoh Peter In 《Mobile Networks and Applications》2012,17(1):110-118
One of the important issues of green mobile networking is the low energy consumption for either mobile devices or transmissions.
To adapt this, a low-cost Inter frame mode decision (MD) algorithm is proposed for H.264/AVC encoder to reduce the computational
complexity of the original encoding procedure in this paper. The information extracted from macroblock (MB), such as energy,
temporal domain mode similarity and so on, which can be used to pre-estimate the optimal mode of the MB is investigated and
utilized to eliminate the redundant mode candidates. The performance evaluations including quantitative analysis and PC simulations
show that the proposed algorithm is an energy-efficient source coding because it can reduce around 85% Inter frame encoding
time with little quality loss. It can be widely implemented in green mobile networking systems with H.264/AVC standard to
realize the real-time video signal coding. 相似文献
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TD-SCDMA室内分布系统组网方式 总被引:1,自引:0,他引:1
本文针对TD-SCDMA室内分布系统与原有2G室内分布系统的不同,分析TD-SCDMA组网的可行性方案,并且对每种方案重点、难点提出解决方案。 相似文献
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地铁内信号的覆盖问题始终困扰运营商,目前行之有效的方法是搭建一套漏泄通信系统.此系统首先应用合路平台设备(POI)技术;其次采用漏缆传输方式对地下空间进行信号覆盖;再次通过有线方式将各运营商的信号传送到地铁站内的各自基站,系统信号经POI合路后通过地铁内的漏缆把信号发送出去,从而实现地铁内信号的覆盖.最后将研究成果应用到某运营商地铁线路的网络建设中,为后期地铁无线网络设计提供了思路. 相似文献
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通过对几种常见组网模式的比较,提出应根据移动基站的维护需求选择监控系统的组网方式,并对进一步完善监控系统的建设提出了建议。 相似文献
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杨健 《电信工程技术与标准化》2015,(5)
通过对FDD与TDD LTE系统在双工方式、帧结构、下行传输模式、时延、覆盖能力、承载速率、组网方式等方面的对比,深入分析了FDD与TDD LTE在技术上的差异,并指出融合组网是必然演进趋势。 相似文献