基于全局约束的现网站址共享下LTE天线参数规划与优化

针对传统天线参数规划和优化方法的局限性以及在现网站址共享下LTE天线参数规划与优化应用上的不足,提出了基于全局约束方法在LTE天线参数规划与优化上的理论基础、实现方法和操作流程,并通过对广州某区域现网站址共享下LTE天线参数规划与优化的具体操作和仿真,采用量化分析验证了全局约束的现网站址共享下LTE天线参数规划与优化的科学性和可行性。     

小基站在LTE异构网络中的应用发展研究

LTE(长期演进)的频段普遍较高,传统建设方式覆盖效果不佳,LTE主要采用异构网络进行深度覆盖和热点容量吸收。而具有多种技术优势的小基站有望成为未来解决LTE异构网络底层覆盖的重要手段。文章首先阐述我国小基站在LTE异构网络中的重要性和现网应用部署情况,接着对比分析小基站与传统建设方式的异同和作用,分析阐述小基站的网络规划和优化,最后分析小基站在LTE网络建设中的应用原则和应用案例。     

LTE基站系统的PCI自配置技术研究

PCI(物理扇区标识)是LTE(long term evolution,长期演进)的重要无线参数,影响LTE网络规划和网络性能。主要讨论了LTE基站系统的PCI自配置技术,包括实现自配置功能的自组织网络架构、实现流程和PCI资源规划及分配策略。通过LTE基站系统的PCI自动配置,提高LTE网络的部署效率,提升LTE网络系统性能,减少人工规划和操作。     

LTE混合组网中基于多目标粒子群的自规划

TDD-LTE与LTE-FDD混合组网对网络规划依赖较高。为实现LTE混合组网的基站选址自规划,使网络同时满足覆盖、能效比、负载、成本最优,提出了一种均衡多目标优化的混合组网基站选址规划模型。结合LTE混合组网理想回传的特点,重新构建多个目标优化函数,利用改进的离散多目标粒子群算法,从Pareto解集中模糊折衷选取较优解进行优化。仿真结果表明,提出的网络自规划方法能够综合提高网络性能同时减少成本,具有较好的应用价值。     

基站天线阵列设计

LTE系统通俗讲就是我们常说的3.9G,离4G还有一步之遥,是3G迈向4G的过渡版本。LTE基站的天线阵列设计也是目前天线阵列设计的主流。LTE基站的设计其系统架构中节点更加少,网络构成分支也更少更扁平化,信息的传送减少了在基站节点中耗费的逻辑消耗时间,因此大大地提升了网络传递信息的速度和效率。在未来的一段时间,LTE基站的天线阵列设计必将迅速得到推广。     

LTE基站天线阵列设计

天线在通信系统中无可替代的重要性,使得天线设计一直是移动通信研究的热点。第四代移动通信(The 4th Generation mobile communication technology,4G)已经开始在我国普及,LTE是3G转向4G的关键环节。文章主要研究LTE基站天线阵列的设计,通过仿真测试的方式优化确定理论确定的各项参数,最终实际参数和数据的仿真结果表明了文章所确定的参数是符合LTE工作要求的。     

LTE SON下的一种基站自规划机制

为适应LTE SON减少人工参与、降低运营成本(OPEX)的要求,针对网络不能动态调整参数、自主规划基站位置的情况,设计出了一种LTE下根据业务量的变化动态调整eNB参数的自规划流程,并最终计算出新建eNB的位置坐标.通过仿真对其进行了衡量和分析,结果表明在该坐标新建一个eNB不仅能够使业务量溢出的eNB得到极大的缓解...     

塔顶放大器在LTE网络中的应用分析

LTE网络建设中遇到了一些挑战,包括上下行不平衡、基站天线成本和安装难度大、与3G基站覆盖不同步等。针对这些情况,本文提出了使用塔顶放大器的方案提高基站上行接收灵敏度,从理论上分析了塔顶放大器对于提升覆盖能力的效果,并总结了塔顶放大器在LTE网络建设中的应用场景。     

CSM无线网络滚动开通基站模式探讨

从滚动开通基站流程及在该建设模式下基站如何进行站址选择、天线参数及发射功率设计、小区频率规划等方面论述了一种将网络优化思想融于无线基站工程建设中的基站开通模式。     

LTE时代基站天线面临新挑战宽带化、电调化及独立调整成关键

随着移动宽带的快速发展,基站天线对网络性能乃至用户体验的影响越来越大.当前中国无线通信发展迅速,三大运营商针对3G网络进行了天线系统的招标,即将到来的LTE规模建网,更需要大量的天线. 然而,2G、3G与LTE多网共存、FDD/TDD融合组网、LTE频段分散、基站选址难等问题给运营商带来巨大挑战.如何在部署的LTE网络时选择最适合的天线,以保障最佳网络性能,进而保证用户体验,成为LTE运营商关注的焦点.     

网优集约化在LTE基站勘察规划项目中的应用

通过探讨网优集约化思路和方法在LTE勘察规划项目中的具体运用,总结出了一套适合贵州分公司实际情况的整网组建、站点审核原则、天面选择原则、设备选型及安装布局原则,为后期的LTE网络优化打下了良好的基础。     

TD-LTE和LTE FDD融合组网天馈部署策略研究

从覆盖能力和站址空间的角度对LTE与3G系统共站址部署的可行性进行了分析;在对LTE FDD采用2T4R和多标准基站问题分析的基础上,分析了基于多标准基站的LTE融合组网天馈建设方案,给出了TD-LTE和LTE FDD融合组网条件下的天馈部署策略。     

LTE网络规划设计审核平台的研究与应用

随着4G-LTE网络的大规模建设应用, LTE网络建设工作日益繁重。运营商迫切需要一种管理机制以及相应的管理平台,能够实现对LTE网络规划勘察设计完成全生命周期集中管控。本文基于以上内容,研究提出了一种基于全生命周期管控的LTE网络规划设计审核平台,实现对LTE网络建设工作的标准化、信息化、规范化、集中化、系统化管理,有效管控LTE无线网络站点从规划需求到开站入网各个环节,良好支撑LTE集中规划设计审核及入网工作。本平台已实现并在实际工作中得以应用,具有良好的应用价值。     

MIMO系统下随机接入的实现及吞吐量研究

随机接入技术作为LTE系统中的关键技术之一,接入成功率关系到传输时延,LTE系统下的随机接入所采用的传统冲突解决算法主要是基于网络层的重传机制。提出了一种MIMO下的随机接入实现方案,基站端可以利用多天线接收和先进的MIMO信号处理技术的结合,进而联合高层解决冲突,仿真结果表明了该方案可以显著地提高系统的吞吐量。     

Antenna array techniques for nonuniform cell zooming and adaptive frequency planning

This paper proposes the antenna array system and the techniques for the nonuniform cell zooming and adaptive frequency planning which is suitable for the energy‐efficient LTE network and multitier 5G heterogeneous network. The antenna array system is designed for the beam width control and scan control in the azimuth plane. The beam tilt is controlled in the elevation plane to control the cell radius. The first feature of the antenna array system is to perform nonuniform sector size control in order to deal with the nonuniform traffic distribution. The second feature of the antenna array system is to control the beam scan in the azimuth plane for the adaptive frequency planning. The footprint control of the current work is evaluated considering the antenna array's radiation pattern and all the physical parameters. Adaptive frequency planning can mitigate cochannel interference (CCI), which may be caused due to the cell zooming techniques proposed in this work. The footprint simulations confirm that the antenna array system can control the sector size with the highest possible flexibility. The antenna array system due to these features can effectively mitigate the interference. The results also confirm that the current antenna array system outperforms the existing antenna array systems.     

5G与LTE无线网络设计差异性分析

5G无线网络系统相对LTE系统在技术架构、设计目标和面向业务上具有较大的区别,其无线网络设计无法简单采用现有LTE网络的设计方法。通过分析5G系统组网的技术方案,从网络规划覆盖、机房和天馈设备安装、有源数字室内覆盖系统等方面分析其与LTE系统的无线网络设计的差异性,帮忙设计从业人员建立对5G网络的整体认识,更好促进5G无线网络的设计,提升网络覆盖效能。     

Small‐cell planning in LTE HetNet to improve energy efficiency

Cell planning is one essential operation in wireless networks, and it significantly affects system performance and cost. Many research efforts consider the cell planning problem with identical base stations (BSs) or to construct a new network on the region without any infrastructure. However, long‐term evolution (LTE) adopts heterogeneous network, which allows operators to tactically deploy small cells to enhance signal coverage and improve performance. It thus motivates us to propose a small‐cell planning problem by adaptively adding low‐powered BSs with the limitation of budget to an existing network to increase its energy efficiency, which is defined by the ratio of network throughput to the amount of energy consumption of BSs. We consider 2 types of LTE small cells, namely, microcells and picocells, and develop different clustering strategies to deploy these cells. Based on the available resource and traffic demand in each cell, we then adjust the transmitted power of the deployed BS with energy concern. Experimental results demonstrate that our small‐cell planning solution can achieve high‐energy efficiency of LTE networks, which means that BSs can better use their transmitted energy to satisfy the traffic demands of user devices. This paper contributes in proposing a practical problem for cell planning with heterogeneous network consideration and developing an efficient solution to provide green communications.     

Optimization of adaptive antenna system parameters in self-organizing LTE networks

In wireless communications the demand for wide range of services is leading to a rapid increase in network performance requirements. Hence, today’s cellular radio technologies are designed to operate closer to Shannon capacity bound which sets the ultimate upper limit for the wireless channel capacity. Yet, good link level performance does not necessarily mean that network resources are used efficiently as the cellular capacity and coverage performance may not be optimal resulting from dynamic conditions in radio network environment such as urbanization, insertion or deletion of base stations, and malfunctioning nodes. Due to the fact that reacting on those inherent problems manually is very expensive and time consuming, automated optimization of cellular coverage and capacity by means of self-optimization of adaptive antenna system parameters could be an attractive solution from the network operator’s point of view. Furthermore, suboptimal antenna parameter selection in long term evolution (LTE) network planning or the reuse of the sites and antenna parameters of a preceding access technology requires optimization of adaptive antenna system parameters. In this article we propose a novel centralized self-optimization approach that can be used for adapting antenna system parameters in order to automatically control network capacity and coverage in a macro-cellular deployment. In the proposed approach we present case-based reasoning (CBR) based self-optimization aided by an exemplary rule-based scheme which is required during the training phase of CBR. Dynamic system level downlink simulator is developed to validate the performance of the proposed approach in a realistic macro-cellular scenario. In performance evaluations the 3rd generation partnership project LTE system framework is assumed and propagation is modeled in three dimensions.     

一种基于多天线簇的新型LTE室内定位系统

随着移动互联网业务的迅速发展,位置服务需求越来越多样化,定位技术也变得越来越重要.LTE(long term evolution)室内蜂窝网络可以解决GPS(global positioning system)信号无法进入室内的问题,从而提供高精度的位置服务.LTE室内定位需要不同基站之间进行精确同步,这给室内网络部署带来了新的挑战.针对上述问题,提出了一种基于多天线簇的LTE新型无线定位系统,通过上行探测参考信号(sounding referencesignal,SRS)获取信号到达时间差(time difference of arrival,TDOA).该方法不需要簇间同步,可有效降低网络部署难度.其次,针对此系统设计了一种新的TDOA定位算法,可支持灵活的天线簇配置.最后,通过仿真及实验验证了该定位系统及算法的有效性,实验结果表明可实现米级室内定位精度.