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高速公路、铁路隧道无线覆盖技术探讨 总被引:2,自引:0,他引:2
中国电信全业务经营在即,移动网络优化工作将是中国电信今后一项长期的持续的重点工作,本文从笔者所辖维护区域沪蓉西高速公路和宜万铁路工程隧道覆盖的实际需要出发,结合山区隧道覆盖的特点,着重介绍了隧道覆盖的信号源选择、传输方式选择、天馈系统选择方法和优缺点,分析了高速环境下应该考虑的几个重点问题,并探讨了七种典型的隧道场景覆盖方案,从而指导隧道无线覆盖工程规划和建设. 相似文献
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本文通过对移动通信无线信号传播特点的分析,结合高速公路无线信号覆盖的特点。通过对高速公路隧道无线覆盖各种场景的分析,设计出了高速公路各种隧道场景下的移动通信对应的实施方案。对高速环境下信号覆盖的、重点、难点问题进行分析,提出高速公路移动通信无线信号的场强问题、切换问题、多普勒频移问题,并提出了解决方案。 相似文献
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本文主要是结合山区隧道的无线覆盖情况,对移动通信无线信号在高速公路隧道中的覆盖技术进行分析.主要从隧道内分布方案的实施、隧道外投射方案的实施和隧道泄漏电缆方案的实施三个方面展开论述. 相似文献
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移动通信网络采用普通天馈系统和泄漏电缆覆盖方案已成熟应用,文章以惠州移动广河高速公路龙门县境内隧道信号覆盖项目为例,主要针对高速公路隧道采用辐射单元和泄漏电缆作为网络覆盖分布系统时,从网络规划和设计的角度来分析各自方案应用上的优缺点。 相似文献
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文中研究了高速公路隧道智慧管养信息化应用系统,首先了解了高速公路隧道管养现存问题,如效率低、维护难度高等,其后分析了智慧管养系统的优势。在设计智慧管养系统时,需先搭建基础框架,并给出系统整体网络拓扑图,进行软硬件设计,按照模块化设计方法,为移动端、网络端、后台系统等赋予不同的功能,确保各功能项既相关独立,又相互关联,覆盖隧道管养的各个层面与阶段,以提升管养质量、效率,解决历史遗留问题,保障公路隧道稳定、安全地运行。 相似文献
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日前,重庆联通投资15亿元的CDMA第三期工程已全面竣工。整个重庆地区的CDMA覆盖率提高了6个百分点,实现了所有主城区、长江航道、高速公路含隧道、主要交换干线、重要风景点的无缝覆盖,并有效覆盖重庆辖区96%的行政村。同时,CDMA的室内覆盖也迅速完善,各类室内覆盖系统近千套,实现了市内星级以上酒店、重要写 相似文献
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为降低高速公路站点故障对网络质量的影响,本文提出一种高速公路站点故障后基于大数据的网络覆盖自修复的方法,依靠切换链识别技术、替补站点均衡筛选算法和应用黄金分割搜索算法的自动优化方法,实现替补站点的选择和自动优化,保障高速场景用户网络的良好感知。 相似文献
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本文从高速发展状况、听众需求方面阐述了发展高速隧道调频广播覆盖、优化广播覆盖网络的必要性,对高速隧道广播覆盖的建设模式和技术方案进行了分析,总结了工程建设中出现的关键问题。 相似文献
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针对高速公路防护林对移动通信网络覆盖影响问题进行了深入分析,通过现场测试测算出不同厚度防护林对移动通信信号的穿透损耗,进而导出对应的覆盖半径。同时,还对防护林阻挡的季节性影响进行了对比分析,并提出相应的解决方案,从而提高网络服务质量。 相似文献
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关希鸣 《电信工程技术与标准化》2014,(2):69-74
本文针对山区环境下的高速公路特点,通过分析TD-SCDMA无线信号传播特性及路径损耗,提出了一套具有实用性、有效性的覆盖解决方案。 相似文献
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A method for designing a terrestrial digital audio broadcasting single frequency network (T-DAB SFN) for a mountainous region is proposed. A computer database and the digital terrain elevation data are used in designing the network. Two fundamental approaches are compared; first, utilization of the existing transmitter sites is maximized by applying the initial cost constraint; then, the coverage percent of the service is forced to approach to 100% by applying the coverage efficiency constraint. Finally, a T-DAB SFN hybrid design procedure optimizing both constraints is proposed. The three design approaches are illustrated on the coverage of the mountainous Istanbul-Ankara highway. The results are compared using a reference cost look up table. The hybrid approach is shown to optimize the initial cost and the coverage efficiency, and can be applied to similar networking problems 相似文献
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该文基于大尺度路径损耗无线传播模型将高速公路场景中的车用自组织网络(VANET)建模为几何随机图,提出了VANET有效组网面积的概念,分析说明了VANET的准线性拓扑特点,并基于交通流理论关于自由流条件下的车头时距分布,推导得出了无线传输范围内至少存在k个邻居的概率计算方法。实验结果表明:该文提出的概率描述思想是一种适合计算高速公路场景中车辆网络节点度的有效方法。 相似文献
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《Vehicular Technology, IEEE Transactions on》1980,29(2):192-199
The increased installation of citizens' band (CB) radios in private vehicles has provided the opportunity to consider new methods of communications for motorist aid purposes. With channel 9 reserved as the emergency and assistance channel of CB radio, numerous volunteer and government organizational units throughout the United States have established networks to monitor this channel for these urgent calls. However, the extent of the roadway system in the U.S. makes total coverage of the highway system 24 h/day impractical, leaving major coverage gaps in both time and location. The technical and operational feasibility of a system which could provide wide area 24 h/day coverage with low manpower requirements is discussed. The system is called Citizens' Band--Automatic Interconnect Digital System (CB-AIDS) and uses unmanned remote stations to provide an automatic interconnect of a CB base station to a response network through the dial telephone system. Access to the system is provided by use of a digital adapter attached to the user's CB radio. This system has been installed on an experimental basis in DeKalb County, GA, through funding by the Federal Highway Administration, in order to determine the technical and operational feasibility of the concept. During the program, 100 digital adapters were produced and provided to volunteers who travel in the areas covered by three remote stations. The remote stations provide dial telephone access to either the DeKalb County Police Department Communications Center or to a volunteer Dual County Radio Emergency Associated Citizens Teams (REACTS) monitor based on user push-button selection. Following the telephone connection, voice communications proceed on a push-to-talk basis in the same manner as normal CB communications. The system was placed in operation in April, 1978, and is presently active. 相似文献