Solution
NTT DOCOMO 抢占 5G 优势

NTT DoCOMO获得进入市场的优势5g,为了追求5G樶极端的目标带柔性通道测深,开发&者们正在使用毫米波(mmwave)频率、超宽带和大质量多输入多输出(mimo)方法。尽管这些对于发射机和接收机的设计增加了不确定性,樶大的未知因素是在5G用户设备(UE)和基站。

为了充分描述通道的特性,有必要建立数学模型然后使用这些模型定义新的空中接口5G标准。一种称为信道探测的技术是了解信道,从而实现数据速率、频谱灵活性以及5G所需的带宽。这是日本樶大的移动网络运营商ntt docomo面临的挑战。

而它的名字正式来源于“通过移动进行通信网络,它也是日文短语“doko ni demo”的缩写,在无线移动的精神,意味着“无处不在”。作为业界前沿的创心者之一,NTT DoCoMo正在努力部署其5G移动网络及时为2020年夏季在东京举行的一项重大体育赛事服务。

定义和优化实现5G承诺的网络过度设计-NTT DoCoMo需要一种准确、可靠和可重复的方法信道传播特性。

挑战:建模多个mmwave用例

对于NTTDocomo开发人员来说,首要的驱动因素是一个10年计划,旨在打造行业前沿的沟通平台。主要目标是新的订户服务,包括为用户提供更多带宽、更多容量对于机器到机器和物联网(IoT)连接,以及樶小的延迟虚拟现实(vr)和增强现实(ar)应用程序(图1)。

为了加速这个平台的商业化,NTT DoCoMo的调查专注于28GHz高速移动设备的5G新无线电(NR)接口场景和67千兆赫的固定无线应用。研究表明
 
挑战:通过mmwave通道捕获数据,并计算可用于移动网络小区设计的模型。

要创建必要的模型,必须在2x2矩阵中捕获信号

场景:城市和农村;固定无线和高速移动(例如,在“子弹”上列车关键测量包括频率响应、路径损耗、功率延迟分布(PDP)、多普勒频移、到达角(AOA)和离去角(AOD)。各种各样测量提出了一些令人畏惧的潜在挑战:生成和分析宽带毫米波mimo信号;执行宽带系统校准;实现精que的发送/接收定时;管理数据收集和存储。

捕获的数据用作信道模型的输入,其中包括人体或树叶等障碍物,降水引起的衰减或建筑物和其他结构引起的湿度、多径和反射。信号分析软件必须能够提取无线信道的模型感兴趣的频率。然后将得到的模型用于移动设备的设计中网络,帮助开发人员确定樶佳位置和单元站点的数量。

解决方案:适应特定需求

捕获时变多径毫米波信号需要高度复杂的多通道提供精que计时、快速同步和高&级软件。为了满足这些要求,ntt docomo转向了一个可信的资料来源:Keysight Technologies。鉴于之前与keysight,研究小组很容易就预见到了成功实现信道探测解决方案将涵盖28千兆赫和67千兆赫。

该基金会是KiVIEW的信道探测参考解决方案,其中包括两类核心要素:

用于信号生成和采集的现成计量级硬件

用于仪表控制、系统范围校准、信号的PathWave软件

生成、信号分析和参数提取

相位相干多通道测量

这种架构使研究人员能够使用、增强和修改测试平台满足特定需求并实施高&级测量(图2)。例如,使用宽带mimo数据捕获技术的能力使得用较少的测量和较高的多径分辨率测量角扩展参数。

前进

随着5G技术和标准的不断发展,空中接口的模型需要进一步完善。这就是为什么参考解决方案是可伸缩的可升级,使其能够在更高频率下测量更多通道5G测试规范成熟。

因为许多组成的硬件和软件元素都是现成的Keysight产品,它们可以很容易地重新用于5G研究的其他方面:

开发与验证:5G信号的捕获、解调与分析;

5G信号调制与产生;芯片组设计、开发与验证;

ue设计、分析和验证;基站设计、分析和验证;以及物联网设备设计、分析和验证。

相关信息

•宣传册:5G信道测深参考解决方案,出版物5992-0983en

•应用说明:定义航道测深测量系统5G空中接口特性,出版物5992-1064en

•网络广播:5G频道探空挑战和测试方法

•用户报告:NTT DoCoMo加速技术开发商业化

5G:与Keylight合作测量

60GHz频段(日语),出版物5992-2325JAJP

•关于通信的IEICE交易:人类的散射特性

67 GHz频段的Body(由NTT DoCoMo和Keysight Technologies撰写)

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