GSM/WCDMA网络共基站建设分析

首先详细分析了3G/2G基站共站址的可行性；接着分析了3G／2G系统共站组网的各种干扰、隔离度要求．给出了工程改造的隔离间距建议；最后从机房和天面两个方面分析比较了共基站配套改造建设的各种方案。     

Telemar／Oi与华为合作扩建巴西GSM商业网络

华为技术有限公司近日宣布，巴西GSM移动运营商Telemar／Oi授予华为扩容巴西GSM网络的合同。根据合同，华为将为Telemar／Oi大规模提供基站、基站控制器等全套GSM／EDGE无线设备。华为的GSM新一代基站采用3G技术设计，容量大，覆盖能力强，能够有效降低网络建设与运营成本，凭借优良的性能为GSM网络注入新的能量和活力，一经推出即获得全球GSM运营商的青睐。截至目前，华为的GSM基站已服务全球60多个国家，部署超过50万载频。     

2G与3G混合组网策略研究

WCDMA技术是3G标准系列家族中三大主流标准之一,能够实现GSM网络的平滑过渡.本文从WCDMA基站和GSM基站之间的互干扰、链路预算以及容量方面分析了WCDMA基站和GSM基站共站的可行性.另一方面,考虑到WCDMA无线网络与GSM的不同及其特点,对混合组网的策略进行研究.     

TD-SCDMA与GSM系统共站设计初探

3G网络建设是一个系统工程，涉及面广、投资巨大、周期长。其中，在基站的选择上需要花费很长的时间。考虑到GSM已有的众多基站资源，可以采用TD—SDCMA与GSM已有基站共站的方式。这样不仅节省了网络建设时间，而且可以在很大程度上节约成本。尽快推出业务才能在市场取得先机。为使移动运营商在竞争中取得有利地位，获得3G牌照后可以迅速地开展网络建设，     

2G与3G混合组网研究——WCDMA和GSM共站可行性分析

在WCDMA网络建设初期,为了节省投资,一般不会形成全国性连续覆盖网络,这时可以使用WCDMA和GSM双模终端,充分利用GSM网络的连续覆盖,避免WCDMA的覆盖盲区,同时,GSM用户又能享受3G的高端服务。因此,在未来,WCDMA和GSM商用网络共存是必然趋势。为了节省WCDMA的网络投资和加快网络建设速度,在WCDMA网络建设中,可以考虑WCDMA和GSM基站共站点。WCDMA和GSM基站共站点可行性分析干扰分析从理论上分析,WCDMA和GSM基站之间存在以下干扰:(1)加性噪声干扰。这是干扰源产生在被干扰频段的噪声,包括干扰源的杂散、噪底、邻道、…     

TD-SCDMA与GSM系统共站设计初探

一、引言 3G网络建设是一个系统工程,涉及面广、投资巨大、周期长.其中,在基站的选择上需要花费很长的时间.考虑到GSM已有的众多基站资源,可以采用TD-SDCMA与GSM已有基站共站的方式.这样不仅节省了网络建设时间,而且可以在很大程度上节约成本.尽快推出业务才能在市场取得先机.为使移动运营商在竞争中取得有利地位,获得3G牌照后可以迅速地开展网络建设,我们建议移动运营商采用TD-SDCMA与GSM已有基站共站的方式.     

基于覆盖条件下的GSM/WCDMA共址组网可行性分析

对于电信运营商而言,基站进小区选址的难度已远远大于2G建网之时,而有关运营商已有庞大的GSM网络,能否利用现有的2G站址和机房,实现机房、站址、传输资源共享,是电信运营商面临的主要现实问题之一。本文基于GSM／WCDMA技术特点,以密集城区为例通过2种方式对GSM和WCDMA网络的覆盖进行分析,探讨了海南联通GSM和WCDMA基站共址的可行性。     

GSM/WCDMA混合组网策略浅析

随着3G的日益临近，国内运营商正筹备各种资源，为3G建设做准备。在GSM网络向WCDMA网络演进过程中，运营商将会面临很长一段2G／3G网络混和共存的时期。文章从3G网元的设置、2G网元的升级以及2G／3G网络互通等多个方面，思考并浅析了GSM／WCDMA混和组网的相关策略。     

GSM和WCDMA共站址分析

目前国内移动运营商拥有覆盖良好的GSM网络，3G网络的建设应该以2G网络为基础，在城区应实现3G的连续覆盖，才能降低建网成本，提供业务的连续服务能力。如何解决GSM与WCDMA的共址组网，在3G商用时是一个不可回避的话题。如何解决GSM与WCDMA的共址，充分利用现有网络的资源，也是每个运营商必须考虑的问题。GSM与WCDMA共站址方案在覆盖策略、容量负荷分担、2G系统改造等方面存在诸多问题，在实际操作和实现过程中也相当复杂，对相关理论研究带来了新的挑战和机遇。     

移动软交换同时支持2G／3G 诺基亚提出2G／3G共核心网思路

诺基亚认为，为了同时改造原有网络并且兼顾未来3G的发展方向，需要在当前进行网络投资时就进行充分的规划。参照国际与国内主要运营商的发展经验而言，移动软交换与2G／3G共核心网将成为目前GSM网络发展的主要趋势，使用移动软交换技术将可以确保网络在相当—段时间内的先进性，而2G与3G的共核心网将帮助运营商实现网络的平滑过渡。[编者按]     

5G无线网工程建设技术要求研究

本文针对5G基站的建设特点,结合5G实验网测试数据,分别针对室外站和室分站研究了5G无线网工程建设技术方案。重点从4G/5G设备比较、5G站间距、5G天面建设、5G干扰要求、5G BBU安装、5G电源工程和5G室分方案等方面进行分析,提出5G BBU安装工艺和5G基站干扰隔离的要求,解决了5G工程建设天面空间不足、BBU散热要求较高和功率需求较大的问题。     

Emission Reduction and Capacity Increase in GSM Networks by Single Antenna Interference Cancellation

There is an increasing demand to utilize the frequency spectrum of mobile communication systems most efficiently. This means in particular to GSM networks that the frequency reuse shall be planned as low as possible. In this case the system may become limited by interference rather than coverage. One promising technology for GSM mobiles in interference-limited systems is single antenna interference cancellation (SAIC). This receiver technology allows both for increasing the network capacity and for reducing the base station transmit power. The aim of this paper is to assess the emission reduction as well as the system capacity capabilities when SAIC technology is applied in downlink receivers.     

TD-LTE网络农村高山站建设策略研究

通过分析农村高山站2G网络MR数据,评估不同覆盖半径下活动用户数的比例,综合实地勘查结果,根据4G网络建设需求,判定高山站是否建设TD-LTE基站,给出建设策略,为工程提供理论支撑与指导。     

无线基站的经济效益分析及其在无线网络规划、优化中的应用

本文以GSM网络为例,简要介绍了运营商网络规划人员开展基站经济效益分析的方法,并通过示例介绍了其在无线网络规划和优化中的具体运用。本文讨论的方法对于运营商开展TD-LTE网络的规划和优化也有重要的参考意义。     

The Complementary Use of 3G WCDMA and GSM/GPRS Cellular Radio Networks

The traffic performance of integrated 3G wide-band code division multiple access (WCDMA) and GSM/GPRS network is evaluated. This type of network links two cellular radio systems which have different set of frequency bands and the same coverage size. The base station of 3G WCDMA is installed on an existing GSM/GPRS site. Dual-mode mobile terminals use handoff to establish calls on the better system. The soft handoff or inter-frequency hard handoff occurs when mobile terminals of 3G WCDMA or GSM/GPRS move between two adjacent cells, respectively. The inter-system hard handoffs are used between 3G WCDMA and GSM/GPRS systems. The data rate conversions between different systems, soft handoff region size, multiple data rate multimedia services, and the effect of the mobile terminal mobility on the user mean dwell time in each system are considered in the study. The simulation results demonstrate that a great traffic performance improvement on the complementary use of 3G WCDMA and GSM/GPRS cellular radio networks compared with the use of GSM/GPRS cellular radio networks. When high-data rate transmission is chosen for low-mobility subscribers, both the handoff failure probability, and carried traffic rates increase with the new call generation rate. However, both rates decrease conversely with the increasing new call generation rate as soon as the new call generation rate exceeds a critical value. This causes the integrated networks saturation. The higher mean speed for the mobile terminals produces lower new call blocking probabilities and total carried traffic. The new call blocking probabilities and total carried traffic increase with the size of the soft handoff region.     

GSM Mobile Station Location Using Reference Stations and Artificial Neural Networks

In this paper we present a novel approach to the automatic GSM mobile station location. The approach is based on measurement of radio signal strengths from a number of the neighboring base stations (antennas) and estimation of the mobile station position using trained artificial neural network (ANN) models. First, we present an improved version of our previous positioning back propagation (BP) ANN multi-level perceptron (MLP) model that further improves positioning accuracy. Then, we extend the MLP primary ANN model by introducing correctional factors obtained from a number of reference stations with known positions. Two new models with the improved location accuracy, both aimed at real-time application, are presented. The first model is using differential range to improve the estimated location of the mobile station. The second is using small-scale secondary neural networks trained with data obtained from reference stations, in addition to the primary ANN, to correct location accuracy.     

面向方向图保形的共口径基站天线去耦技术

为了节省基站天线所占空间资源,降低其运营成本,现代移动通信需要将多个天线阵列紧密地排列在一起,构成多频共口径基站天线。多天线的紧密排列势必造成天线间强烈的耦合,不仅使得天线阻抗失配、隔离度变差,同时也造成辐射方向图的严重变形。因此,近年来多频共口径基站天线的去耦成为工业界和学术界研究的热点,早期的去耦技术主要是面向改善天线的阻抗匹配和隔离度,而对面向方向图保形的去耦技术研究相对较少。文章在简要介绍面向方向图保形的基站天线去耦技术的研究现状的基础上,重点阐述了褚庆昕教授天线射频团队基于感应电流抵消、耦合场抵消和辐射阻断等原理,提出的几种新型的去耦技术。这些技术不仅可以有效地改善基站天线的阻抗匹配和隔离,更重要的是很好地实现了天线方向图保形。仿真和测试结果验证了原理的正确性和设计的可行性。一些技术已被用于5G基站天线产品。     

软件无线电技术在GSM基站中的实现

针对移动通信GSM基站软件化的问题,依据软件无线电的基本理论,采用宽带中频带通采样软件无线电的方法来实现GSM基站的信号接收,建立了移动通信GSM基站接收机的系统模型,并给出了具体方案。     

GSM移动台的软件设计

本文简要介绍了 GSM 系统中移动台软件的功能、模块结构及其运行流程。着重说明了主要模块的基本功能,并以呼叫建立为例对移动台与系统基站的信令交换进行了较为详细的论述。     

Opportunistic interference management: a new approach for multiantenna downlink cellular networks

A new approach for multiantenna broadcast channels in cellular networks based on multiuser diversity concept is introduced. The technique called opportunistic interference management achieves dirty paper coding capacity asymptotically with minimum feedback required. When there are K antennas at the base station with M mobile users in the cell, the proposed technique only requires K integer numbers related to channel state information between mobile users and base station. The encoding and decoding complexity of this scheme is the same as that of point‐to‐point communications, which makes the implementation of this technique easy. An antenna selection scheme is proposed at the base station to reduce the minimum required mobile users significantly at the expense of reasonable increase in feedback. In order to guarantee fairness, a new algorithm is presented that incorporates opportunistic interference management into existing Global System for Mobile communications (GSM) standard. Copyright © 2014 John Wiley & Sons, Ltd.