Electromagnetic Environment Impact of Mobile Communication Iron Tower on Adjacent Building and Its Countermeasures

For several lightning-strike disasters related to base station iron tower of mobile communication carrier operator, disaster-inducing factors were analyzed. The reason was as below： after lightning receptor of base station iron tower of mobile communication carder operator was struck by lightning, electromagnetic radiation was generated in the process lightning current leaking into the ground. In addition, it was lightning scattered- strike phenomenon induced by overhead lightning rod, that is, ground lightning falling density around overhead lightning rod was larger than mean at the site. Finally, some improvement measures were put forward.

Analysis of Dispersed Lightning Stroke around a Mobile Communication Base Station

A case of villagers suffering lightning stroke around the tower of a mobile communication base station was investigated to analyze its reasons,and the countermeasures against lightning stroke were proposed. The results show that the lightning stroke event is related to dispersed lightning stroke. To avoid the damage caused by lightning stroke,it is needed to equip a house in the dispersed lightning stroke zone with lightning protection system and spread lightning protection knowledge among the villagers.

Location correction technique based on mobile communication base station for earthquake population heat map

China has mobile phone penetration rate of over 96.2%.Mobile phone has become the largest Internet terminal for Chinese Internet users.Population geographic distribution in earthquake zones can be got based on mobile phone positioning and map matching.For reducing earthquake black-box stage,we propose a real-time collection,correction and schedule algorithm of population position data by four stream processing environments(Redis,Hbase,Kafka,and Spark Streaming)in this paper.For labeling precisely population geographic distribution on the network map,matching of population geographic coordinates and map coordinates are optimized by sample comparison based on location data of mobile communication base stations and prefecture level cities.The test result shows the proposed system is high efficient and can rapidly respond to any emerging parallel tasks during the earthquake.A high-precision heat map of affected population can be produced and published on-line within 2 min after the devastating earthquake happened.

A Review in the Core Technologies of 5G: Device-to-Device Communication, Multi-Access Edge Computing and Network Function Virtualization

5G is a new generation of mobile networking that aims to achieve unparalleled speed and performance. To accomplish this, three technologies, Device-to-Device communication (D2D), multi-access edge computing (MEC) and network function virtualization (NFV) with ClickOS, have been a significant part of 5G, and this paper mainly discusses them. D2D enables direct communication between devices without the relay of base station. In 5G, a two-tier cellular network composed of traditional cellular network system and D2D is an efficient method for realizing high-speed communication. MEC unloads work from end devices and clouds platforms to widespread nodes, and connects the nodes together with outside devices and third-party providers, in order to diminish the overloading effect on any device caused by enormous applications and improve users’ quality of experience (QoE). There is also a NFV method in order to fulfill the 5G requirements. In this part, an optimized virtual machine for middle-boxes named ClickOS is introduced, and it is evaluated in several aspects. Some middle boxes are being implemented in the ClickOS and proved to have outstanding performances.

移动通信土建配套工程快装基站应用与分析

通过对移动通信快装基站的概述,介绍了快装基站的类型及技术参数,将快装基站结构进行了力学分析,并对快装基站设计难点及先进性作了归纳,同时与同类塔型的技术经济指标作了对比,表明快装基站具有良好的发展前景。

移动基站共址高压输电铁塔的应用研究

为了探索在电力铁塔上共址建设移动通信基站的可行性,针对广深高铁实际情况,结合国家电力设施相关要求,研究了移动基站架设在某区段电力铁塔上的工艺要求,并进行了荷载和电磁干扰评估。基站建成后,经过实际测试,新建共址基站满足覆盖要求且运行良好,验证了在电力铁塔上共址移动通信基站建设思路的可行性。

HTS filter and front-end subsystem for GSM1800 wireless base station

The first HTS front-end subsystem for wireless base station in China was developed. This demonstration system, which aims at the application in GSM1800 mobile communication base station, consists of a single RF path, i.e. one filter and one LNA, integrated with the pulse tube cooler. The subsystem works at a pass band of 1710-1785 MHz with a gain of 18 dB and at a temperature of 70 K. The accomplishment of such a demonstration subsystem can boost the development of HTS commercial subsystem.

电力铁塔共享移动通信基站电磁辐射研究

通信基站站址资源逐渐成为运营商基站建设的最大瓶颈,尤其是在城市周边土地资源紧张的地区,高额的选址及协调费用极大地增加了运营商的建站成本。目前我国高压输电线路形成了分布广泛、电压等级分明的通道,为通信天线基站共用电力铁塔创造了良好条件。但铁塔周围电磁环境将在共享通信基站后发生变化,给周边民众以及电力检修人员带来了新的电磁辐射问题。文章采用理论计算分析及现场实测的方法,对电力铁塔共享TD-LTE基站电磁环境进行了分析,包括天线的主要指标、功率密度计算、电磁环境防护距离计算等,选择典型的铁塔进行了现场监测,监测结果其电场强度限值监测值为0.22~3.25 V/m,满足相关标准中对电场强度12 V/m的要求。

楼顶式移动基站电磁辐射污染调查

对南通市楼顶式移动基站电磁辐射污染进行了调查。结果表明,南通市418个楼顶站基站周边地面50 m范围内电磁辐射功率密度值均能满足《电磁环境控制限值》(GB 8702—2014)的要求;楼顶美化天线、集束天线和景观塔等建设较晚的楼顶塔形地面电磁辐射强度相对较小,楼顶角钢塔、拉线塔和抱杆等建设较早的塔形地面电磁辐射强度相对较大;楼顶塔所在楼顶平台监测值存在轻度超标的情况。提出,应严格控制楼顶塔所在楼顶的人员可达性,即基站电磁辐射防护区应高出楼顶2 m以上,避免公众进入基站电磁辐射防护区内,受到基站天线的过量辐射影响。

移动基站共址架空输电塔专用防雷系统研究

架空输电塔上的防雷系统只针对架空输电塔而设计,未能很好地保护移动基站。为达到保护架空输电塔的同时也能保护移动基站目的,设计了一种移动基站共址架空输电塔专用防雷系统。在正负极性标准雷电波的作用下,获取闪络电压,并计算雷电流超出概率。根据计算结果,抑制雷击过电压,完成系统软件设计。通过系统测试可知,使用移动基站共址架空输电塔专用防雷系统后,接地电阻由6.75Ω降到了0.54Ω以下,且瞬时电压呈平稳状态,降低了线路雷击跳闸率,提高了耐雷水平。

移动通信基站速装铁塔基础方案探讨

探讨移动通信基站速装铁塔基础形式,在传统现浇筏板基础和拼装基础上,创造性的引入后浇混凝土的施工方法,设计开发出了一种新型预制拼装基础,该基础形式既保证了拼装基础的结构安全,又能满足生产、加工、运输、安装的各项条件,具有施工速度快、施工协调难度小、质量易于管控、综合造价低等优势,在交通运输方便、具备良好的施工操作面的地区,新型预制拼装基础可以发挥有效的作用,是具有推广价值的新型单管杆塔基础设计施工方法。