第三代移动通信系统无线传输技术分析

介绍第三代移动通信系统无线传输技术的研究情况,对当前两种主要的无线传输技术候选方案进行比较和分析,最后对无线传输技术的发展进行预测。     

TD-SCDMA──中国的IMT-2000RTT方案

简要介绍了第三代移动通信系统的研究开发情况,并对我国第三代移动通信系统无线传输技术IMT－2000RTT方案（时分-同步码分多址）作了深入探讨。     

信息产业部规范提法:第三代移动通信名为IMT-2000

第三代移动通信正在成为整个信息产业的热点。鉴于国内对第三代移动通信无线传输技术的名称提法比较混乱,为避免引起误解或为人所利用,在国际电联还没有选定将采用的技术方案之前,信息产业部科技司最近建议对第三代移动通信采用国际电联的名称提法,即IMT-2000。 目前,第三代移动通信已越来越成为世界各国通信界所关注的焦点。我国专门成立了原邮电部第三代移动通信领导小组,同时也成立了第三代移动通信无线传输技术(RTT)评估协调组(该组已在国际电联注册)和技术开发小组。这两个小组正在按照电联规定的时间表开展工作,积极参与国际电联的标准化活动并取得了一定收效。     

基于宽带码分多址的无线接入技术

宽带CDMA是第三代移动通信系统(IMT-2000)的核心技术。主要介绍了无线接入并从无线传输技术要求出发,分析了宽带码分多址(W—CDMA)的若干优势,着重分析了基于第三代移动通信系统(IMT—2000)的宽带CDMA无线接入的关键技术。     

第三代移动通信系统及其主要无线技术

介绍了第三代移动通信系统（又称IMT－2000）,通过对欧洲和日本的WCDMA技术以及北美的cdma-2000技术的比较,阐述了第三代移动通信网的主要无线传输技术的发展。     

第三代移动通信发展热点探讨

论述了第三代移动通信的产生和特点，围绕与其相关的四大热点问题（频谱分配、无线传输技术、网络结构及第三代系统的构建）进行了深入细致的讨论。最后对我国建设第三代移动通信提出了一些建议。     

中国的3G技术——TD—SCDMA

近年来,第三代移动通信一直是人们关注的热点。而我国提出的ＴＤ－ＳＣＤＭＡ(时分同步码分多址)无线传输技术现已作为中国提出的第三代移动通信标准,被国际电信联盟接纳为第三代移动通信标准之一,与欧洲支持的ＷＣＤＭＡ和美国的ｃｄｍａ２０００成为未来全球第三代移动通信标准的３个最主要的竞争者。     

第三代移动通信标准化研究的最新进展

本文介绍了第三代移动通信的无线传输技术与网络标准化研究的最新进展,其中包括国内外第三代移动通信标准化组织的情况,以及最近的ITU-R TG8/1会议和3GPP会议有关标准化研究的新成果.     

第三代移动通信系统的演进趋势

本文根据世界各国向ITU提交的无线传输技术(RTT)方案 ,讨论了向第三代移动通信系统演进的趋势。     

第三代移动通信系统中的卫星RTT技术

本文介绍了第三代移动通信系统中卫星无线传输技术的ＳＷ－ＣＤＭＡ,对其物理信道作了详细说明。     

WWRF - the Wireless World Research Forum

Third generation mobile radio systems are currently being deployed in different regions of the world. Future systems beyond the third generation are already under discussion in international bodies and forums such as ITU, WWRF and R&D programmes of the European Union and in other regions. These systems will determine the research and standardisation activities in mobile and wireless communication in the next years. Based on experience of the third generation, future systems will be developed mainly from the user perspective with respect to potential services and applications including traffic demands. Therefore, the Wireless World Research Forum was launched in 2001 as a global and open initiative of manufacturers, network operators, SMEs, R&D centres and the academic domain. WWRF is focused on the vision of such systems - the Wireless World-and potential key technologies. This paper describes the international context of activities on systems beyond third generation, the goals, objectives and structure of WWRF, the user perspective as the starting point for a future system design and the key enabling technologies for the Wireless World.     

IMT—2000技术与标准化动向

１９９９年３月,在ＩＴＵ－Ｒ ＴＧ８／１第１６次会议上确定了ＩＭＴ－２０００无线接口参数;目前提交到ＩＴＵ的ＩＭＴ－２０００地面无线传输技术提案已有１０种。其中Ｗ０ＣＤＭＡ和ｃｄｍａ２０００两种主流宽带ＣＤＭＡ技术仍在努力寻求标准的统一,我国提交的ＴＤ－ＳＣＤＭＡ技术与３ＧＰＰ的ＴＤＤ方案也在积极探讨融合。标准融合尽管很困难,但仍存在着可能性。我国在考虑第三代移动通信采取的态度和策略时,应充分兼顾     

A framework design for the next-generation radio access system

Extensive use of the Internet and huge demands for multimedia services via portable devices require the development of packet-based radio access systems with high transmission efficiency. Advanced radio transmission technologies have recently been proposed to achieve this challenging task. However, few researches have been reported on the design of an integrated system that can efficiently exploit the advantages of these transmission technologies. This paper considers the design of a packet-based cellular system for next-generation radio access. We propose a novel system framework that can incorporate various advanced transmission technologies such as link adaptation, opportunistic packet scheduling, channel coding, and multiantenna techniques. For efficient use of these technologies together, we first investigate the interoperability between these technologies by proposing a so-called cause and effect analysis. Based on this investigation, we design a differentiated-segments-based orthogonal frequency-division multiplexing system, called DiffSeg, to accommodate heterogeneous operating conditions in a seamless manner. Simulation results show that the proposed DiffSeg system can provide a nearly optimum performance with flexible configuration in a wide range of wireless channel conditions.     

The Universal Mobile Telecommunication System

The concepts, requirements, and technologies of Europe's third generation mobile communication system-the Universal Mobile Telecommunications System (UMTS)-are discussed. The cellular architecture, radio resource, adaptive resource allocation and handover enabling techniques for realizing an effective UMTS access network are described. The modulation schemes, multiple access methods, and duplexing methods used in the third generation mobile system's flexible radio interface are also described. The architecture, mobility support, and protocol development of the UMTS fixed network are outlined     

Lightweight Secure Roaming Mechanism Between GPRS/UMTS and Wireless LANs

The third generation partner project (3GPP) has standardized general packet radio service (GPRS) and the universal mobile telecommunications system (UMTS) to provide cell phone communications and wireless Internet services. Although the data transmission rate is lower than that of wireless local area networks (WLANs), GPRS/UMTS covers larger areas. Hence, to achieve higher speed ubiquitous access, we propose a lightweight secure roaming mechanism (LSRM) that integrates GPRS/UMTS and WLAN. Taking advantage of these two technologies, LSRM offers anonymous roaming and friendly subscriber management. Besides, we give a formal security analysis to LSRM based on BAN authentication logic.     

A CDMA‐based radio interface for third generation mobile systems

This paper deals with the use of a CDMA-based radio interface in third generation mobile systems (Universal Mobile Telecommunications System – UMTS, and Future Public Land Mobile Telecommunications System – FPLMTS). The paper is not intended as a detailed analysis of the radio interface performance, but as an overview of the main issues arising in a typical CDMA-based mobile system, discussing the different available technical solutions. First of all, the basic requirements of the radio interface in a third generation mobile system are outlined. In particular, the support of variable bit rate transmission, the adaptability to the different propagation and service environments and the flexibility are felt to be important topics to be discussed. Then, the main characteristics of the CDMA access technique are depicted, in relation with the above mentioned requirements, focusing in particular on the DS-CDMA radio interface designed within the RACE II – CODIT Project. In that context the paper describes some of the technical solutions proposed for the provision of advanced features such as macrodiversity, multibearer transmission and variable bit rate services. This revised version was published online in June 2006 with corrections to the Cover Date.     

GSM向第3代移动通信系统的演进

对我国现有的GSM移动通信系统向第 3代移动通信系统的发展予以探讨 ,分析了GSM演进过程中出现的若干新技术 :通用分组无线业务、增强数据率的GSM演进方案以及第 3代移动通信系统。着重于介绍演进过程中各阶段的技术、所能提供的无线数据传输率以及所能承载的业务集 ,探讨了演进策略的可行性。     

Mobile Network Evolution – “The Return of the Pipe”

The mobile network evolution from second generation to third generation systems has opened possibilities for inclusion of new technologies both in the network infrastructure as well as on the radio access. Within this paper, we concentrate on the evolution of the network infrastructure towards a future mobile network that balances the demand for increased flexibility with the necessity of limiting system complexity. Based on existing architectures, to lower complexity such as layered architecture for the core network and mobile packet backbone, we describe one possible evolution path for the control layer. Our approach is a step towards a control space that includes packetpipe control functions for a multitude of packetpipes. Such control function needs to be supported in the heterogeneous networks of today and the future.     

认知无线电技术及应用

认知无线电技术是目前无线传输领域的主要研究热点之一。对认知无线电的不同定义进行了讨论,并从认知无线电系统组成及认知无线电与其他无线电(特别是自适应无线电和智能无线电)的关系2方面分析了其内涵,重点介绍了无线频谱感知、智能资源管理、自适应传输和跨层设计等认知无线电系统主要关键技术;最后给出了认知无线电可能的应用场景。