某运营商农村数据业务承载方案建议

针对某运营商EGRPS网络在农村面对的困境和该运营商GSM900技术向UMTS900技术或LTE技术演进的必要性,分析7GSM900技术向UMTS900技术或LTE技术演进的频率规划,最后从覆盖、容量和网络改造三个方面分析了该运营商GSM900技术向UMTS900技术或LTE技术演进对现有GSM900网络影响。UMTS900和LTE允许的下行最大路径损耗比GSM900语音业务允许的最大路径损耗大3～4dB,部署UMTS900或者LTE系统后,可以提供的下行数据吞吐量是原有GSM900系统的4．38—20．18倍。     

WCDMA引入900M组网分析

本文分析了UMTS900Mhz与UMTS2100相比将带来的深度度和广度覆盖的益处,同时也分析了UMTS900与GSM900优势,除了以上的两点优势外,UMTS900比GSM900能在容量上有很大的提升;UMTS900将改善密集市区的深度覆盖和这个频段上的容量不足。     

MR在UMTS900规划中的应用

通过对终端测量报告(MR)信令数据的深度分析,准确评估GSM900/DCS1800退出后2G网络覆盖恶化情况以及UMTS900的覆盖水平,在多网协同的建设背景下指导UMTS900的规划。     

部署UMTS900带来的网优问题探讨

简要介绍了UMTS900技术原理;对中国联通部署UMTS900网络带来的频率规划、干扰、GSM语音业务容量、天馈系统及2G／3G互操作等问题进行了深入研究,并给出了相关优化建议。     

UMTS900农村场景的建网分析

在简单介绍了uMTs900的概况之后,文章分析了uMTs多频段的组网特性与策略,针对农村广覆盖的场景,提出UMTS900的引入策略与组网方式,最后讨论了联通应用UMTS900存在的问题及解决方案。     

高通公司、西班牙电信和华为完成UMTS／HSDPA900MHz现场测试

高通公司、西班牙电信和华为技术有限公司宣布在位于西班牙埃斯特雷马杜拉地区的Talarrubias使用900MHz频谱完成了3GUMTS与HSDPA的现场测试。该测试结果证明UMTS与GSM在900MHz频段可以共存。     

中国联通WCDMA900MHz网络性能分析

通过介绍WCDMA 900MHz产业链的发展现状,分别从WCDMA900MHz关键技术研究、联通外场组网性能分析等方面,研究引入U900后对GSM900和WCDMA 900网络性能的影响,并结合中国联通的网络特点,提出了建设WCDMA 900MHz网络的部署建议。     

高增益、高线性度平衡放大器模块

ALM-1522非常适合如GSM、CDMA、UMTS等800MHz／900MHz移动通信频带主流标准,以及700MHz频带运作的LTE应用。     

GSM/UMTS的系统模型、网络结构及GPRS/IP分析

本文简述了GSM/UMTS的系统模型及主要接口 ,重点分析了一种可能的GSM/UMTS网络结构及其合理性 ,提出了一种支持多媒体业务的GPRS/IP结构及用户平面协议参考模型 ,最后指出了研究UMTS的重要性。     

UMTS分组域与GSM/GPRS系统间切换过程中数据缓存与转移的实现与分析

首先介绍了UMTS中的几种切换类型,然后就UMTS分组域到GSM/GPRS系统间切换(SGSN间),GSM/GPRS到UMTS分组域系统间切换(SGSN间),UMTS分组域到GSM/GPRS系统间切换(SGSN内),GSM/GPRS到UMTS分组域系统间切换(SGSN内)这4种切换过程中的数据缓存与转移的实现过程进行了详细论述,并进行了进一步深入的分析与比较,最后指出其优缺点。     

A Frequency Tuning Method for a Planar Inverted-F Antenna

A novel method is presented for electrically tuning the frequency of a planar inverted-F antenna (PIFA). A tuning circuit, comprising an RF switch and discrete passive components, has been completely integrated into the antenna element, which is thus free of dc wires. The proposed tuning method has been demonstrated with a dual-band PIFA capable of operating in four frequency bands. The antenna covers the GSM850, GSM900, GSM1800, PCS1900 and UMTS frequency ranges with over 40% total efficiency. The impact of the tuning circuit on the antenna's efficiency and radiation pattern have been experimentally studied through comparison with the performance of a reference antenna not incorporating the tuning circuit. The proposed frequency tuning concept can be extended to more complex PIFA structures as well as other types of antennas to give enhanced electrical performance.     

基于微蜂窝基站应用的小型化多频段内置天线

一种应用于微蜂窝基站的覆盖5个频段的新型多频段小型化内置天线被提出。该天线的体积为26×16×25mm3,可以工作于以下无线通信系统:GSM850/GSM900/DCS/PCS/UMTS。将该天线与微蜂窝基站模型安装在一起之后的测试结果和仿真结果都已给出并予以讨论。     

UMTS security

The Universal Mobile Telecommunications System (UMTS) is one of the new 'third generation' mobile cellular communication systems. UMTS builds on the success of the 'second generation' GSM system. One of the factors in the success of GSM has been its security features. New services introduced in UMTS require new security features to protect them. In addition, certain real and perceived shortcomings of GSM security need to be addressed in UMTS. This paper surveys the major security features that are included in the first releases of the UMTS standards.     

Wide tunable dual-band reconfigurable antenna

Presented is an antenna that allows independent and versatile dual frequency and bandwidth reconfiguration by using simple external matching circuits. Simulations suggest that the antenna has a total tuning range of 2118 MHz (from 778 to 2896 MHz) while maintaining a return loss above 6 dB. In addition, the antenna is capable of operating as a penta-band cellular phone antenna. This kind of antenna is typically required to work within the GSM900, GPS1575, GSM1800, PCS1900 and UMTS2100 bands.     

Multi-band hybrid antenna for ultra-thin mobile phone applications

A compact hybrid antenna consisting of two PIFAs and a slot antenna is proposed for ultra-thin mobile phone applications. The antenna has a very compact volume of 46 x 10 x 4.2 mm3, and it operates at GSM 850/900, DCS, PCS, and UMTS bands, simultaneously. Results show that its bandwidth and efficiency are sufficient for these penta-band mobile phone applications.     

Privileged Treatment of UMTS Subscribers in GSM Networks

Different user segments have various requirements and expectations towards the performance of mobile networks. Subscribers having experienced the high quality of UMTS networks desire to maintain high speech quality and excellent data throughput also in areas of missing UMTS but existing GSM coverage. In GSM networks a privileged treatment of UMTS subscribers by means of proper resource allocation provides a substantial quality improvement with respect to standard GSM subscribers. This strategy allows network operators to reduce the performance gap between both network areas experienced by UMTS subscribers. A detailed study on the performance of circuit switched speech and packet data services has been performed based on system level simulations. The results show significant speech quality advantages for users with dual-RAT terminals compared to standard GSM users as well as notably higher data throughput rates.     

面向GSM/UMTS技术的移动通信综合解决方案

以毛里求斯MTML Ⅰ,Ⅱ期为例,介绍面向GSM/UMTS技术的移动通信综合方案。首先较为系统地就MTMLGSM/UMTS全网综合解决方案中涉及到的网络规划、微波传输规划等进行了讨论。之后就GSM/UMTS移动通信系统综合解决方案中,涉及到各专业产品技术方案与网络架构等,进行了较为详细地展开阐述。