移动WiMAX与3G技术关系的探讨

文章比较了移动WiMAX与3G／E3G的技术特点，探讨了WiMAX与3G／E3G之间的关系，并对移动WiMAX的应用前景进行了分析。     

移动WiMAX成为3G标准后的影响分析

本文简要介绍了移动WiMAX（802.16e标准）的发展情况,并从多个方面对比了移动WiMAX与其它3G技术,初步揭示了移动WiMAX的优势和劣势,分析了移动WiMAX成为3G标准后所带来的一系列影响。     

移动WiMAX全面挑战3G

随着WiMAX技术和产业链的成熟,WiMAX仍然没有寻找到一个全球统一的可用频段,这使得WiMAX很难在全球市场获得突破,更加难以形成规模效应。在这种情况下,WiMAX阵营决定加入ITU-R的3G及4G标准,无疑使WiMAX与现有各个3G技术将展开全面的竞争。目前,移动WiMAX产业仍然不算成熟,但商用进程却在逐步加快。最值得关注的仍然是移动WiMAX今后在移动通信技术领域中的地位。移动WiMAX已经不满足定位于3G的补充技术,而是直接与其进行正面交锋,这给今后的移动通信市场格局增加了很多变数,尤其是很多设备厂商在发展3G的同时也涉足于WiMAX产业,而运营商也将在众多移动通信技术中进行选择。     

浅析移动WiMAX技术的特点与应用

介绍了WiMAX技术的发展历程，分析了移动WiMAX技术的特点和与3G标准的性能比较，并针对移动WiMAX技术的特点分析了其所面临的机遇和挑战。     

浅析移动WiMAX和HSDPA的数据传输效率

随着移动WiMAX成为3G标准,研究和吸收移动WiMAX的先进技术,对于促进现有3G技术的发展具有十分重要的意义。本文在深入分析移动WiMAX的基本概念和物理层参数的基础上,详细计算出其在不同调制方式和编码速率下的理论数据传输速率、频带利用率,并与WCDMA HSDPA进行了对比分析。     

浅析移动WiMAX技术的特点与应用

简单介绍了WiMAX技术的发展进程；较为详细地分析了移动WiMAX技术的特点，并与3G标准进行了比较；针对移动WiMAX技术的特点，论述了其所面临的机遇和挑战。     

浅析移动WiMAX和HSDPA的数据传输效率

移动WiMAX已成为3G标准之一,研究和吸收移动WiMAX的先进技术,促进现有3G技术的发展具有十分重要的意义。在深入分析移动WiMAX的基本概念和物理层参数的基础上,详细计算出其在不同调制方式和编码速率下的理论数据传输速率和频带利用率,并和WCDMA HSDPA进行了对比分析。     

3G及E3G与WiMAX关系及发展探究

移动技术在近十几年中得到了快速发展,各种创新层出不穷.近年来,3G业务用户发展迅速.WiMAX的出现为移动用户提供了宽带数据业务,威胁了3G数据业务的发展,3G组织决定发展E3G计划.介绍了移动技术的演进历程,3G近期的发展概况,以及E3G计划和进展,并对3G、E3G与WiMAX进行了分析比较.     

WiMAX的3G悬念

频率决定未来两年一度的世界无线电通信大会今年将在日内瓦召开,世界无线通信大会是ITU划分无线频率的最高会议。今年大会有一个特别重要任务是为后3G定频率,而美国政府在推动移动WiMAX技术成为3G技术之一,能否获得相关的频率规划是移动WiMAX能否成为3G技术的前提,因此,本次大会对WiMAX前景影响巨大。     

WiMAX与3G是敌还是友

近来,随着WiMAX技术的不断发展和标准的不断成熟,业界对于WiMAX和3G之间的关系讨论的越来越热烈。WiMAX和3G究竟是竞争的关系还是相互补充共同发展的关系呢?本文的作者对于这个问题给出了自己的思考和答案。摩托罗拉(中国)电子有限公司所撰《WiMAX与3G是敌还是友》一文首先明确了WiMAX与3G是可以相互共存的,WiMAX能够成为3G非常有力的补充。然后说明了WiMAX能够给缺乏3G频谱的运营商发展高速数据业务,给固网运营发展移动电信业务,以及给在尚无宽带的农村地区和新兴市场迅速部署通信设施提供了可能。最后提出了WiMAX未来发展的几大关键因素。本文对于我们明确WiMAX和3G的定位与未来发展方向具有一定的参考价值。     

Mobile WiMAX systems: performance and evolution

Mobile WiMAX was successfully adopted by ITU as one of the IMT-2000 technologies in November 2007. Since then mobile WiMAX (a.k.a. IP-OFDMA) has officially become a major global cellular wireless standard along with 3GPP UMTS/HSPA and 3GPP2 CDMA/ EVDO. Mobile WiMAX is an OFDM-based technology available for deployment today, and new WIMAX devices come to market at much reduced cost than that of current 3G solutions. Currently over 260 service providers are deploying fixed, portable and mobile WiMAX networks in 110 countries. This article provides an overview of the mobile WiMAX system and its performance under various configurations, channel conditions, and types of data traffic. Furthermore, the article provides an overview of mobile WiMAX evolution.     

Overview of mobile WiMAX technology and evolution

Mobile WiMAX is a fast growing broadband access technology that enables low-cost mobile Internet applications, and realizes the convergence of mobile and fixed broadband access in a single air interface and network architecture. Mobile WiMAX combines OFDMA and advanced MIMO schemes along with flexible bandwidth and fast link adaptation, creating a highly efficient air interface that exceeds the capacity of existing and evolving 3G radio access networks. WiMAX networks, built on all-IP network architecture for plug and play network deployments, can support a mix of different usage and service models. While some consider mobile WiMAX as a candidate for the fourth generation of mobile networks, others view it as the first generation of mobile Internet technologies emerging from a wider ecosystem targeting to extend the success of WiFi over wide area networks supporting mobility. This article provides a high-level overview of mobile WiMAX technology and its evolution roadmap from both radio and network perspectives.     

Seamless integration of mobile WiMAX in 3GPP networks

As the wireless industry makes its way to the next generation of mobile systems, it is important to engineer solutions that enable seamless integration of emerging 4G access technologies within the currently deployed and/or evolved 2G/3G infrastructures. In this article we address a specific case of such a seamless integration, that of mobile WiMAX in evolved 3GPP networks. In this context we investigate the architecture and the key procedures that enable this integration, and we also introduce a novel handover mechanism that enables seamless mobility between mobile WiMAX and legacy 3GPP access, such as UTRAN or GERAN. The core characteristic of this novel handover mechanism is that mobile terminals do not need to support simultaneous transmission on both WiMAX and 3GPP accesses; therefore, it mitigates the RF coexistence issues that exist otherwise and improves handover performance. In addition, we provide a brief overview of mobile WiMAX and the evolved 3GPP network technologies, and we set the appropriate background material before presenting our proposed handover mechanism. Our main conclusion is that integrating mobile WiMAX in evolved 3GPP networks is a compelling approach for providing wireless broadband services, and mobility across WiMAX and 3GPP access can become seamless and efficient with no need for mobile terminals to support simultaneous transmission on both types of access.     

从宽带无线接入与宽带移动通信技术的融合看B3G技术的发展趋势

本文总结与比较了3GPP长期演进技术、3GPP2空中接口演进技术、IEEE 802.16e WiMAX技术和IEEE 802.20 MBFDD/MBTDD技术的标准化进程、系统需求和核心技术.在此基础上,本文讨论了宽带无线接入技术和宽带移动通信技术的融合趋势,并探讨了超3G技术的发展方向.     

WiMAX系统及其设备研发

文章根据WiMAX系统的市场定位及设备需求,较详细地探讨了WiMAX系统及设备研发需要考虑的主要方面,包括需求和产品定义、技术整合、产品架构,以及目前产业链发展现状及技术走向,并从中得出了一些有价值的结论.文章认为WiMAX产品研发需要在借鉴WiFi模式的同时更多地完成技术整合,WiMAX必须继续坚持其开放性、低成本及新技术的发展方向,致力于宽带无线接入(BWA)及移动宽带无线接入(MB-WA)相互兼容、相互补充的发展之路.     

Advancement of MIMO technology in WiMAX: from IEEE 802.16d/e/j to 802.16m

WiMAX is the first cellular standard that employs OFDMA technology and provides true integrated services for both fixed and mobile broadband access. Among the many new technologies adopted in WiMAX, MIMO antenna technology plays an essential role in delivering fast, rich-content, mobile broadband service reliably over extended coverage areas. In this article we provide a survey on the state of art of MIMO technologies in current WiMAX standards with an emphasis on practical engineering considerations. Moreover, we also briefly discuss the ongoing MIMO technologies in the evolution toward the next-generation WiMAX network.     

The Mobile Broadband WiMAX Standard [Standards in a Nutshell]

Mobile worldwide interoperability for microwave access (WiMAX) is a wireless standard that introduces orthogonal frequency division multiple access (OFDMA) and other key features to enable mobile broadband services at a vehicular speed of up to 120 km/h. WiMAX complements the and competes with wireless local area networks (WLANs) and the third generation (3G) wireless standards on coverage and data rate. More specifically, WiMAX supports a much larger coverage area than WLAN, does not require line of sight for a connection, and is significantly less costly compared to the current 3G cellular standards. Although the WiMAX standard supports both fixed and mobile broadband data services, the latter have a much larger market. Therefore, this article will briefly present the Mobile WiMAX standard, the technologies deployed for the air interface and the network, and the development of the standards to support mobile multihop relays in a WiMAX network.     

移动WiMAX系统的技术分析及对TD-SCDMA的发展启示

本文首先对移动WiMAX的主要技术进行分析,主要包括MIMO技术、OFDM／OFDMA技术及越区切换等,然后阐述了移动WiMAX目前的发展状况,就其对我NTD—SCDMA的发展提供的借鉴经验进行介绍。