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4G LTE-Advanced技术标准 总被引:1,自引:0,他引:1
1引言LTE-Advanced指的是LTE在Release10以及之后的技术版本。2004年底,在3GPP中开始进行LTE的标准化工作,与3G以CDMA技术为基础不同,根据无线通信向宽带化方向发展的趋势,LTE采用了OFDM技术为基础,结合多天线和快速分组调度等设计理念, 相似文献
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随着2G、3G和LTE的发展,移动业务的带宽不断提升,移动宽带化时代已经到来。移动宽带化的同时,移动业务类型也向ALL IP转型。移动业务的IP化和宽带化发展趋势,推动着移动承载网络向IP化演进。 相似文献
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LTE-Advanced是基于LTE演进的下一代移动通信技术,能够提供多种服务和更高速的数据业务。介绍了LTE-Advanced的演进过程以及其演进的目标,同时结合与LTE系统的比较,对其涉及的相关关键技术进行了详细描述。 相似文献
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LTE-Advanced是基于LTE的增强与演进,载波聚合技术是LTE-Advanced的关键技术之一。文章介绍了LTE-Advanced载波聚合技术的背景、技术构成及在3GPP中的标准化进程,并总结了该技术的下一步研究重点与发展方向。 相似文献
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移动与宽带充当发展主动力LTE成为演进方向
近年来,移动和宽带业务为运营商带来了丰厚的回报,并将继续成为电信业发展的主要动力。从市场环境来看,移动化和宽带化是电信业所有参与者的必然选择。随着传统话音业务和固网窄带接入的衰退,电信产业发展只能寄望于移动和宽带,移动化和宽带化将是运营商赢得竞争的必然要求。 相似文献
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TD-LTE通信技术采用了国际上先进的LTE通信技术体制,以TDD双工方式为特征,是我国自主创新的TD-SCDMA的演进技术,是下一代移动通信与宽带无线接入融合的典范,也是未来宽带移动通信的主流标准之一。结合水利通信业务的发展,文中分析了TD-LTE的关键技术及特点,并给出了基于TD-LTE技术的网络架构,同时重点介绍了其在水利防汛中的应用。 相似文献
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Wireless and mobile communications have developed rapidly in recent years due to the endless demand for broadband multimedia Internet access and wireless connection anywhere and any time. Several 4G standards have been proposed such as WiMax, LTE and IEEE 802.11n. Signal processing plays a key role in the evolution of wireless and mobile communications. With the emergence of various 4G enabling technologies, advanced signal processing has become ever increasingly important for low complexity, low power and efficient physical implementations of future multimedia communication systems. Multi-antenna, multi-frequency, multi-user and cooperative technologies have emerged as powerful enablers for high date rate and highly reliable broadband communications. To harvest the benefits of these technologies maximally, both excellent opportunities and significant challenges are present in the research of signal processing. The aim of this special issue was to publish some most recent advances in the signal processing aspects of these wireless and mobile communication technologies. Five papers have been selected for the special issue. These papers cover various multi-antenna topics including MIMO detection, spacetime equalization, MIMO channel prediction and estimation, and space-time coding. Some papers also consider cooperative relay communications, OFDM, and multiuser systems. 相似文献
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宽带无线移动通信发展 总被引:3,自引:0,他引:3
王志勤 《电信工程技术与标准化》2009,22(10):1-3
本文旨在阐述宽带无线移动通信技术与产业发展现状及趋势。3G增强型技术已成为当前主导宽带无线市场的力量。我国3G网络建设全面铺开,市场尚处于起步阶段。新一代宽带无线移动向LTE发展成为共识。LTE逐步在全球启动部署,我国主导并积极推动TD—LTE的研发和产业化。 相似文献
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本文借中国移动推行TD-LTE网络建设的契机,以A城市为案例,着重介绍了PTN承载LTE网络的演进方案. 相似文献
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The mobile broadband technologies are reaching a commonality in the air interface and networking architecture; they are being
converged to an IP-based network architecture with Orthogonal Frequency Division Multiple Access (OFDMA) based air interface
technology. From technical perspective, fundamental goal of mobile broadband is to offer higher data rates with reduced latency.
The third Generation Partnership Project (3GPP) presents the Long-Term Evolution (LTE) project in order to accommodate increasing
mobile data usage and new multimedia applications. In the near future, with the recent progress made by technical specifications
and vendor technology demonstrations LTE will emerge as successor to cellular systems as a broadband wireless solution. This
paper provides an overview of 3GPP LTE including its history, features, technology, architecture and future. The technology
components include OFDMA air-interface, Multiple-Input and Multiple-Output (MIMO) antenna technology and higher order modulation.
The architecture includes Evolved Packet Core (EPC) and Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) components.
This paper will concentrate to describe the main functions of the most important network elements. Also, the aim of this paper
is to present the future potential of LTE which will make it an inevitable choice for wireless network operators around the
globe. 相似文献
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长期演进(LTE,Long Term Evolution)是移动网络演进的下一代主流版本,将引领移动通信进入真正的宽带时代。相比现有的2G/3G网络,LTE产生了一些新的需求,从而导致其承载网解决方案相应发生较大变化。本文主要围绕LTE发展情况、对承载网的要求以及承载解决方案等内容进行介绍,并在此基础上对目前几种主流的承载方案的优劣势进行了较详细的分析和比较。 相似文献
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游牧和移动宽带无线接入将成为未来通信市场的重要需求.WiMAX正是针对这一需求而专门发展的,其性能强、效率高、成本低,具有灵活的体制,可通过配置满足各种应用场景的要求.同样,为了进入宽带无线接入市场,3GPP首先发展了被称为3.5G的HSDPA技术(可以大幅度提高分组数据的传输速率),2004年底又决定发展长期演进(LTE)计划,其指标和技术都与WiMAX相近,可以说是殊途同归.面对LTE的竞争,WiMAX要想在宽带无线接入市场中占有一席之地必须拥有好的频率,使用地面电视广播频率可提供大面积覆盖,降低成本. 相似文献
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基于Licensed Assisted Access技术的退避算法设计与优化 总被引:1,自引:1,他引:0
随着无线宽带网络的发展,移动数据业务疯狂增长,频谱资源紧缺,为了扩充LTE容量,提高频谱利用率,LAA(Licensed Assisted Access)技术,即在非授权频段部署LTE网络,与其他无线接入技术(如Wi-Fi技术)融合共存的问题,逐渐成为研究焦点。因此,竞争机制中退避算法的设计成为关键。本文主要针对Wi-Fi与LAA共存的场景,基于LBT(Listen Before Talk)竞争机制,设计了三种退避算法,并在ns-3仿真平台上实现仿真,对比纯Wi-Fi环境下的性能表现,对退避算法进行合理的优化。 相似文献
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LTE和LTE-Advanced关键技术综述 总被引:2,自引:0,他引:2
为满足移动宽带业务的需要,LTE正日渐成熟,它采用扁平化网络架构,关键技术包括OFDM、更高阶调制、HARQ、先进的多天线技术、快速同步技术、灵活的控制信道设计、自适应资源分配、干扰抑制技术等。有关LTE-Advanced的讨论也以展开,考虑的技术包括聚合多载波、高阶MIMO、智能中继、异构网络、协调多点发送和先进的干扰管理。 相似文献