京沪高铁常州段WCDMA网络优化研究

发布时间：2018-09-04 15:09

【摘要】：随着经济的快速发展,我国迈入“高铁时代”。由于高铁的安全、快捷、舒适,高铁逐渐成为大众出行的首选。高速铁路列车在高速运行状态下,移动通信信号产生的多普勒频移、高铁懫用的穿透损耗较大的封闭性车厢,都会对无线网络传输提出新的挑战。为了保障旅客的正常通信质量、提升用户感知,高速铁路的无线网络结构优化变得十分必要和迫切。本文首先介绍了高铁无线网络结构优化的理论基础知识,对高速环境下的无线电磁波传播特性进行了介绍,分析了无线电磁波传播模型,论述了高铁环境下的三种组网方式:公网方式、专网方式、公网和专网的联合组网方式,并对这三种组网方式优缺点进行了详细的对比。随后在无线网络结构优化的理论基础之上,对于专网联合组网方式进行了深入的分析,对于高铁无线网络的布局,以及天线的挂高,站点间的联接,给出了解决方案。分析了各种话务使用情况下小区的最优切换与重新选择,对传播模型和话务模型做了推导计算,并对在不同场景下的构建组网给出了建议。最后,对于京沪高铁常州段遇到的实际问题进行了具体的优化与提升,解决了遇到的一部分问题,对于优化结构做了话务测试和指标分析,完成实际运营中对WCDMA网络的优化。本文结合京沪高铁无线网络提出了一般网络优化流程,根据京沪高铁常州段的无线网络,实现了具体的结构优化:站间距的优化、基站至铁轨垂直距离的优化、天馈设置不合理的优化等。本文所研究的内容对于实际工作具有很强的指导意义。
[Abstract]:With the rapid development of economy, our country has entered the era of high-speed railway. Due to the safety, speed and comfort of high-speed rail, high-speed rail has gradually become the first choice for mass travel. The Doppler frequency shift generated by the mobile communication signal and the closed carriages with high penetration loss in high-speed railway trains will pose new challenges to wireless network transmission. In order to ensure the normal communication quality of passengers and enhance the user perception, the optimization of wireless network structure of high-speed railway becomes very necessary and urgent. This paper first introduces the basic theory of high-speed iron wireless network structure optimization, introduces the characteristics of wireless electromagnetic wave propagation in high-speed environment, and analyzes the wireless electromagnetic wave propagation model. This paper discusses three kinds of networking methods under the environment of high-speed railway: public network mode, private network mode, public network and private network combined networking mode, and compares the advantages and disadvantages of these three networking modes in detail. Then, on the basis of the theory of wireless network structure optimization, the paper makes an in-depth analysis on the mode of joint networking of the special network, and gives a solution to the layout of the high-speed railway wireless network, the height of the antenna and the connection between the stations. This paper analyzes the optimal handover and re-selection of the cell under various traffic conditions, deduces and calculates the propagation model and traffic model, and gives some suggestions for constructing the network under different scenarios. Finally, the actual problems encountered in Changzhou section of Beijing-Shanghai high-speed railway are optimized and promoted, some problems are solved, traffic test and index analysis are done for the optimized structure, and the optimization of WCDMA network in actual operation is completed. Based on the wireless network of Changzhou section of Beijing-Shanghai high-speed railway, this paper puts forward the general network optimization flow, and realizes the specific structure optimization: the optimization of the station spacing, the optimization of the vertical distance between base station and rail, and the optimization of the vertical distance between base station and rail. The unreasonable optimization of the sky feed setting and so on. The content of this paper has a strong guiding significance for practical work.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.53

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