TD-LTE室内覆盖的规划研究

随着互联网的飞速发展,网络建设开始步入规模化和系统化,TD-LTE室内覆盖作为其中的核心环节,理应受到重视。同时,人们对网络的依赖程度逐渐增大,为更好地满足人们网络需求,应建设健全、完善的网络系统。文章重点研究了TDLTE室内覆盖的规划,将TD-LTE室内覆盖分为室内分布系统、室外基站和室内微基站3种基本的规范方式,并结合每种规划方式的特点,阐述其独特优势并分析具体的应用方案。在进行室内覆盖的过程中,应综合考虑用户需求、传输方式、建网成本等方面的因素,从而更好地发挥网络的作用。     

无线室内解决方案及其在移动通信网络中的应用(下)

６现有的室内解决方案(１)直放站室内直放站分布系统是指利用无线接收设备接收并放大室外宏蜂窝基站的信号 ,并导入室内分布系统提供室内覆盖的方式。直放站系统的优点是投资省、安装方便快捷 ,可以很快解决信号弱和盲区问题。缺点是话音质量相对室内基站系统较差 ;其容量是和所接收信号的宏蜂窝基站共享 ,不能提高网络容量 ;另外宽频直放站容易造成干扰 ,不推荐在城市中心区使用。(２)独立内置天线微蜂窝基站内置天线微蜂窝基站系统是指利用微蜂窝基站的内置天线提供对室内的信号覆盖。优点是 :由于大部分的微蜂窝设备无需机房和空调设备 ,…     

TD-SCDMA室内分布系统设计探讨

室内覆盖可以解决高端用户密集城区覆盖问题,减少室外基站的数量和配置,降低室外网络的整体干扰水平,从而提高整个系统的容量,更好地满足用户对质量的要求.与3G其他制式的系统一样,TD-SCDMA在建网的过程中也无法回避室内覆盖问题,同样受限于IMT-2000频段无线电波的传播特性和建筑物的材质,仅仅采用室外的宏蜂窝基站无法保证充分覆盖,不可避免会产生盲区,解决问题的最有效方法是引入室内分布系统.     

室内覆盖电源保障系统解决方案

随着移动通讯业务的快速发展.对写字楼、酒店、商场、超市等人口密集场所进行信号覆盖的室内微峰窝基站逐渐成为移动运营商保障的一个重点.近年来由于国内电力紧张,城市用电量大,供电线路老旧,经常出现事故性或让电等电力中断,导致微蜂窝断站,因此迫切需要对室内覆盖微蜂窝系统建设供电保障设施.本文着重介绍了室内覆盖系统的供电现状、各场景的微蜂窝基站应用的布置、断电及分布等情况、探讨了在室内覆盖系统应用壁挂式UPS解决方案,对使用效果进行了理论计算,并通过各方案在湖北移动武汉分公司应用做出了实际使用效果分析.     

TD-LTE室内覆盖规划设计与建设方案分析

提出TD-LTE室内覆盖解决思路,研究TD-LTE的规划设计,分析TD-LTE与其他系统间的干扰并提出建议,对TD-LTE室内分布覆盖性能进行综合分析,详尽阐述TD-LTE室内建设方案,对TD-LTE室内分布系统规划建设具有重要的指导意义。     

聚焦3GSM世界年会 饱览3G新方案：中兴通讯WCDMA无线网络解决方案

“一全双高，经济灵活”的无线网予系统 中兴通讯高性能、易维护的无线网子系统可提供宏蜂窝、微蜂窝、室内、室外型基带池及射频拉远等全系列化基站产品，可适用密集城区、一般城区、室内和封闭场所、道路沿线广覆盖区及无法获得机房的场所，满足多种无线环境组网需要；高性能、高集成度基站特性、对HSDPA及增强覆盖技术的支持最大限度的提升了设备品质，满足了用户经济灵活的建网要求。     

TD-LTE室内覆盖建设解决方案研究

文章先根据TD-LTE室内覆盖需求,对TD-LTE室内覆盖单通道和双通道两种建设方式进行了研究分析,并给出相应应用场景。再针对双通道模式,提出了具体的室内覆盖解决方案,主要包括基于分布式基站组网方式的室内分布系统建设的解决方案和天线的解决方案。     

TD-LTE室内分布系统规划与组网方案

本文系统分析了频率应用和规划策略、单双路分布系统建设策略、分布系统共用策略、与其他系统干扰规避等TD-LTE室内覆盖组网方案所涉及的核心技术问题,随后基于组网方案研究阐述了TD-LTE室内分布系统的规划方法及规划原则,最后提出了现阶段TD-LTE室内分布系统建设策略.     

中国首个自主研发5G微基站射频芯片流片成功

我国首个5G微基站射频芯片YD9601,在南京宇都通讯科技有限公司经过自主研发流片成功,目前正在进行封装测试。5G基站分为宏基站和微基站两种。宏基站主要用于室外覆盖,5G微基站主要用于室内,发射功率较小(一般200毫瓦以内),广泛用于机场高铁等候区域、商业场所、学校医院、园区工厂和社区家庭等场景。据IT之家来了解,5G微基站可以以较低成本有效解决室内覆盖区域的容量(如机场、高铁和商场等热点区域)和覆盖问题(如商业楼宇和家庭)。     

浅析CDMA网络密集市区覆盖解决方案

密集市区无线传播环境复杂,用户众多,是CDMA网络需要重点覆盖的区域.本文分析了密集市区无线传播环境,根据特定环境下的CDMA网络覆盖特点,提出了各种区域的覆盖解决方案.对于商业中心区应结合室外基站和室内分布系统加强深度覆盖.高层建筑通过基站分裂小区,安装特定的天线,天线上仰等方式进行大部分楼层的覆盖,电梯、建筑物底层、地下停车场通过室内分布系统完善覆盖.密集住宅小区通过在小区外围设站,或者通过射频拉远方式对住宅区进行覆盖,并结合天线美化与伪装,直放站信号源和分布系统进行覆盖.密集城中村通过基站、直放站等信号源结合室外分布系统,选取合适的天线及安装位置进行覆盖.     

基于室内场景的多天线技术应用

多天线技术是无线接入网宽带化、高速化的关键技术,在4G移动通信系统中有着广阔的应用前景.室内覆盖是移动通信的主要业务,运用MIMO技术有效解决室内无线通信系统具有重要意义.围绕无线MIMO技术在室内覆盖中的运用这一主题,对MIMO信道容量、室内信道建模、室内覆盖系统等方面进行了深入的研究.     

LTE移频室内解决方案研究

提出了一种LTE移频室分解决方案,在室分系统中通过一条物理线路传输LTE的MIMO信号,并且可以达到MIMO双路的覆盖效果。通过测试验证了该方案的性能,可实现LTE网络在室内的快速部署。     

室内环境空气质量现状的分析与改善

通过对室内环境空气质量现状的分析,给出其污染的定义和基本情况,针对相关的调查和数据,阐明影响室内空气质量的6大因素,并提出相应的改善措施,使人们进一步重视室内污染问题。     

Building information systems based on precise indoor positioning

During the last 10 years, many modern IT-based applications have developed inside buildings. Many of those applications would benefit by the ability to locate people and/or objects inside the building (indoor positioning). However, most of today's indoor positioning systems are not able to deliver precise position information (<10?cm) along with quality parameters. Ultra wide band (UWB) is a new radio-based technology that allows the determination of distances in indoor environments with a very high spatial resolution even through building materials. At the Institute of Geodesy of TU Darmstadt, a high-resolution UWB positioning system (UWB-ILPS; ILPS, indoor local positioning systems) based on trilateration principle has been developed to estimate the position of a mobile station precisely. To benefit from knowing the position and orientation, it is necessary to select and merge data linked to the user's location for indoor location services. By this means, the visitor to a public building may benefit from the system as his position is shown on a digital floor plan generated dynamically or by retrieving location-based information inside the building. Mixed reality systems also offer advantages for a mobile building information system. For this purpose, a webcam was replaced by the digital camera in the UWB-ILPS prototype. Knowing the camera's location in space and its view direction, one is able to merge the real world taken by the webcam with the virtual world represented by a 3D CAD model of the building.     

Evaluation of the Thermal Comfort of a Thermoelectric Ceiling Cooling Panel (TE-CCP) System

This present work evaluates the cooling performance and thermal comfort of a thermoelectric ceiling cooling panel (TE-CCP) system composed of 36 TE modules. The cold side of the TE modules was fixed to an aluminum ceiling panel to cool a test chamber of 4.5 m³ volume, while a copper heat exchanger with circulating cooling water at the hot side of the TE modules was used for heat release. Thermal acceptability assessment was performed to find out whether the indoor environment met the ASHRAE Standard-55's 80% acceptability criteria. The standard was met with the TE-CCP system operating at 1 A of current flow with a corresponding cooling capacity of 201.6 W, which gives the COP of 0.82 with an average indoor temperature of 27°C and 0.8 m/s indoor air velocity.     

高层小区室分设计分析与应用

随着城市化的进展,各类大型建筑群拔地而起,对于移动通信来讲,随之带来的是给这些高层场景下的用户提供高品质的通话服务。通过哪种设计方式来满足此类需求,保证区域内信号的全方位覆盖,避免边缘地带信号杂乱、信号弱等问题。本文主要从高层小区的设计思路进行分析,以达到解决高层建筑中常见的疑难问题点。     

Automatic virtual calibration of range‐based indoor localization systems

The localization methods based on received signal strength indicator (RSSI) link the RSSI values to the position of the mobile to be located. In the RSSI localization techniques based on propagation models, the accuracy depends on the tuning of the propagation models parameters. In indoor wireless networks, the propagation conditions are hardly predictable due to the dynamic nature of the RSSI, and consequently the parameters of the propagation model may change. In this paper, we present an automatic virtual calibration method of the propagation model that does not require human intervention; therefore, can be periodically performed, following the wireless channel conditions. We also propose a novel RSSI‐based localization algorithm that selects the RSSI values according to their strength, and uses a calibrated propagation model to transform these values into distances, in order to estimate the position of the mobile. Copyright © 2011 John Wiley & Sons, Ltd.     

一种5G室内覆盖解决方案

室内覆盖是5G网络部署中的重点和难点。通过分析5G大规模天线系统的技术特点以及对室内覆盖的性能提升,提出室外宏基站仍是室内浅层覆盖的重要解决手段,并根据外场测试结果对理论分析进行佐证。同时根据覆盖需求使用有源室分和小基站等手段,构建完整的室分解决方案。     

ILONA: indoor localization and navigation system

Indoor positioning is a hot topic these days and there is a growing need for it in public buildings such as airports, hospitals, universities or shopping malls. Indoor positioning systems should be accurate, easily available for the users, with low installation and maintenance cost, which makes development challenging. Existing systems are based on various technologies such as ultrasonic, RFID, WiFi or light encoding. Moreover, these systems are tailored to a given environment and usually rely on a single technology. This paper presents the indoor localization and navigation (ILONA) System, a flexible hybrid indoor positioning and navigation framework. The ILONA System was not designed to be a solution for a single indoor positioning task but to be a standard core component of various systems. The ILONA System provides easily available positioning and navigation services for the end users. The system can manage data from the most commonly available sensors of modern smart phones. Thus, the ILONA System can perform positioning based on various technologies. ILONA System can be established at low cost because it only requires a connection between the server and the clients and WLAN is usually available. Hence, the presented ILONA System provides a widely available, hybrid indoor positioning framework at low cost to the developers of other indoor positioning solutions.     

5G NR室分共享覆盖解决方案

5G网络工作频段分配越来越高,导致室外覆盖室内深度覆盖不足,传统室分存量DAS支持的频段最高到2.7 GHz,为兼顾性能合理利用建设成本,利旧原有网络中已经部署的室分天馈线及设备,分析了高频导致室内深度覆盖不足的特点,根据传统室分网络的现状,以5G业务价值判断需求为场景划分,结合网络中各需求场景室内分布系统的建设特点,利用多样化方案应对差异化需求,多种建设方案并存的理念,给出了面向5G频段室分系统共享覆盖的网络建设思路。