移动WiMAX技术与商用进展

本文对WiMAX的最新标准进展及技术热点进行了介绍．对移动WiMAX商用进展进行概述，并分析了移动WiMAX产业链发展趋势．总结了移动WiMAX的优势与挑战．并对其今后在中国发展的不确定性进行了分析，主要有三个方面：中国3G许可证未发，寻找移动WiMAX的可用频率比固定WiMAX更为困难；技术上的选择可能影响中国整个电信行业的发展。     

关于移动WiMAX系统AMC探究

本文主要简单的介绍了移动WiMAX系统的相关内容,对移动WiMAX系统中AMC技术进行研究,以提高AMC技术在移动WiMAX系统中的应用效果,保障移动WiMAX系统的稳定运行,促进我国无线网络的可持续发展,为人们提供更快、信息容量更大的网络系统,推动我国计算机网络信息技术的高速发展。     

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。     

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。     

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。     

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。     

WiMAX技术发展及关键技术分析

WiMAX技术实现了数据分组化、接人宽带化、终端移动化这三大发展方向的统一，因此自成立之初就在其技术定位上受到了极大的重视。经过几年来WiMAX联盟及其成员不懈的推动，WiMAX技术已在上层标准制定、芯片设计及设备研发的各个环节得到了极大的完善。随着去年年底16e标准解冻及WiMAX认证程序的启动，为加速移动WiMAX的商用发展奠定了良好的基础。目前，韩国运营商KT已经正式商用移动WiBro；美国运营商Sprint Nextel也正式宣布投资30亿美元在全美国范围内部署移动WiMAX网络。这两大规模商用网已成为WiMAX发展史上的里程碑，表明移动WiMAX技术在商用上已开始起步，这给了国内发展WiMAX更多的信心和期待。     

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。     

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。     

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。     

An Adaptive QoS Power Saving Scheme for Mobile WiMAX

With the rapid development of Internet and wireless communication technology, ubiquitous network services become more and more popular. WiMAX is widely used to solve the last mile in network deployment. To enhance the mobility, mobile WiMAX is launched to support the mobile usages. Due to the limited power of mobile devices, power saving becomes a key issue for mobile WiMAX applications. Though plenty of efforts have been proposed to save power on the mobile devices, the problems are partially solved. Among others, sleep mode operations are widely adopted to save power in wireless communications. Generally, longer sleep time can reduce power consumption at the cost of increased packet response delay. To improve the quality of services, an adaptive power saving scheme for mobile WiMAX is proposed in this paper. Parameters related to power management are dynamically set according to current network traffic load. The analyses and simulation results show that the proposed scheme presents superior power efficiency and packet response delay in the context of mobile WiMAX.     

WiMAX点对点宽带无线接入容量分析

随着通信技术的迅猛发展,移动宽带化和宽带移动化是通信网发展的必然趋势。WiMAX城域网无线宽带接入技术,可提供大范围及高速率无线接入,同时支持视距传输和非视距传输,能提供面向互联网的高速无线连接。WiMAX可作为线缆和用户数字线的无线扩展技术,实现无线宽带接入。首先简要介绍WiMAX的应用模式,然后重点分析其点对点应用中上行链路和下行链路的通信容量,提供相关工程技术人员进行方案设计的参考。     

A Survey on Mobile WiMAX [Wireless Broadband Access]

The IEEE 802.16 standard, commonly known as WiMAX, is the latest technology that has promised to offer broadband wireless access over long distance. Since 2001 WiMAX has evolved from 802.16 to 802.16d for fixed wireless access, and to the new IEEE 802.16e standard with mobility support. In this article we provide an overview of the state-of-the-art mobile WiMAX technology and its development. We focus our discussion on QoS provisioning and mobile WiMAX specification.     

WiMAX技术标准的发展进程

IEEE 802.16 is very attractive since its publication,.The growth of WiMAX organization accxelerates the development of 802.16 standard,The mobile WiMAX——802.16e standard is especially attractive,This article presents the status quo and the development of WiMAX technical standard along with the work plan of the standard organization in the next stage.The article also introduces the conditions that the development of mobile WiMAX technical standard is attracting people＇s attention.     

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.     

在众说纷纭中行进的WiMAX

WiMAX在全球的发展遇到诸多挑战和阻力，如：与HSPA和EV-DO等其他移动宽带技术的竞争，没有可供使用的频谱，部分运营商和设备商的推出，等等。但WiMAX的支持者并未因此而停止对WiMAX的推进，Intel、北电网络、Sprint Nextel、摩托罗拉、Vodafone等都在通过各种方式努力推进WiMAX的发展。对WiMAX的频率问题进行了解析，并对WiMAX的市场前景进行了展望。     

Seamless IP mobility support for flat architecture mobile WiMAX networks - [WiMAX update]

The growing demand for wireless Internet services is accelerating the evolution of wireless networks toward all-IP architecture, and the mobile WiMAX network is a prominent example. Although currently deployed mobile WiMAX networks use hierarchical architecture, flat architecture is feasible and specified as a design alternative in the mobile WiMAX standard. In flat architecture the functionalities of the ASN-GW and BS are consolidated into a single element. In this article we first discuss the benefits and challenges of flat architecture mobile WiMAX networks. We then present a scheme to deal with the seamless mobility issue, which is one of the key challenges of the flat architecture. The proposed scheme combines two standard IP-mobility protocols, Proxy Mobile IP and Fast Mobile IP, and customizes them for IEEE 802.16e-based mobile WiMAX networks. This provides interoperability with existing mobile WiMAX networks. We demonstrate the viability of the proposed scheme through simulations using NS-2.     

WiMAX移动收发器芯片研究

介绍了WiMAX标准的国内外发展现状,以及WiMAX芯片的产业现状,选择了4款支持WiMAX移动业务的芯片,对其功能框图、设计特点进行了研究分析和性能比较,并分析了芯片的设计难点及其发展方向.