NTT DOCOMO takes advantage of 5G

NTT DoCOMO gains market-to-market advantage 5G. In pursuit of 5g 樶's extreme goal with flexible channel sounding, developers are using millimeter Wave (MMWave) frequencies, ultra-wideband and mass multiple input multiple output (MIMO) methods. Although these add uncertainty to the design of transmitters and receivers, 樶 the big unknown is in 5G user equipment (UE) and base stations.

In order to fully describe the characteristics of the channel, it is necessary to establish mathematical models and then use these models to define the new air interface 5G standard. One technique, called channel detection, is to understand channels to achieve data rates, spectrum flexibility, and the bandwidth required for 5G. That is the challenge facing NTT Docomo, Japan's 樶 big mobile-network operator.

While its name officially comes from "Communication networks via Mobile," it's also an abbreviation of the Japanese phrase "doko ni Demo," meaning "everywhere" in the spirit of wireless mobility. As one of the industry's leading innovators, NTT DoCoMo is working to deploy its 5G mobile network in time for a major sporting event in Tokyo in the summer of 2020.

Defining and optimizing the network overdesign promised by 5G -NTT DoCoMo requires an accurate, reliable and repeatable method for channel propagation characteristics.

Challenge: Modeling multiple MMWave use cases

The primary driver for NTTDocomo developers is a 10-year plan to build an industry-leading communications platform. The main goals are new subscriber services, including providing users with more bandwidth, more capacity for machine-to-machine and Internet of Things (IoT) connections, and 樶 small latency virtual reality (VR) and augmented reality (AR) applications (Figure 1).

To accelerate the commercialization of this platform, NTT DoCoMo's investigation focuses on the 5G New Radio (NR) interface scenario for 28GHz high-speed mobile devices and fixed wireless applications for 67 gigahertz. Studies have shown that

The challenge: Capture data through the MMWave channel and compute models that can be used for mobile network cell design.

To create the necessary models, signals must be captured in a 2x2 matrix

Scenes: urban and rural; Fixed wireless and high-speed movement (e.g., train critical measurements on the bullet include frequency response, path loss, power delay distribution (PDP), Doppler frequency shift, Angle of arrival (AOA) and Angle of departure (AOD). A variety of measurements present some daunting potential challenges: generation and analysis of wideband millimeter wave MIMO signals; Perform wideband system calibration; Precise QUE sending/receiving timing; Manage data collection and storage.

The captured data is used as input to channel models that include obstacles such as human bodies or leaves, attenuation caused by precipitation or humidity, multipath and reflection caused by buildings and other structures. Signal analysis software must be able to extract the frequencies of interest for the wireless channel model. The resulting model is then used in the design of the network for mobile devices to help developers determine  locations and the number of unit sites.

Solution: Adapt to specific needs

Capturing time-varying multipath millimeter-wave signals requires highly complex multichannels to provide precise que timing, fast synchronization and high-level software. To meet these requirements, NTT Docomo turned to a trusted source: Keysight Technologies. Given the previous collaboration with Keysight, the research team could easily foresee a successful implementation of channel detection solutions that would cover both 28 GHZ and 67 GHZ.

The Foundation is KiVIEW's channel detection reference solution, which consists of two core elements:

Off-the-shelf metering grade hardware for signal generation and acquisition

PathWave software for instrument control, system range calibration, signaling

Generation, signal analysis and parameter extraction

Phase coherent multichannel measurement

This architecture enables researchers to use, enhance, and modify the test platform to meet specific requirements and perform high-level measurements (Figure 2). For example, the ability to use broadband MIMO data capture technology allows angular spread parameters to be measured with fewer measurements and higher multipath resolution.


With the continuous development of 5G technology and standards, the air interface model needs to be further improved. That's why the reference solution is scalable and scalable, enabling it to measure more channels at higher frequencies as the 5G test specification matures.

Because many of the component hardware and software elements are off-the-shelf Keysight products, they can easily be reused for other aspects of 5G research:

Development and verification: 5G signal acquisition, demodulation and analysis;

5G signal modulation and generation; Chipset design, development and validation;

Ue design, analysis and validation; Base station design, analysis and validation; And iot device design, analysis and validation.

The relevant information

• Brochure: 5G Channel Sounding Reference Solutions, publication 5992-0983EN
• Description of application: Defining characteristics of 5G air interface for fairway sounding systems, publication 5992-1064EN
• Webcast: 5G channel sounding challenge and test method
• User Report: NTT DoCoMo accelerates commercialization of technology development
5G: Measurements in collaboration with Keylight
60GHz band (Japanese), publication 5992-2325JAJP
• IEICE transactions on communication: Human scattering properties
67 GHz band Body(written by NTT DoCoMo and Keysight Technologies)

The application respects and protects the personal privacy of all users of the service. In order to provide you with more accurate and personalized services, the application will use and disclose your personal information in accordance with the provisions of this Privacy Policy. However, the Application will treat such information with a high degree of care and prudence. Unless otherwise provided in this Privacy Policy, the app will not disclose or provide such information to any third party without your prior permission. The Application will update this Privacy Policy from time to time. By agreeing to the Application Service Use Agreement, you are deemed to have agreed to all contents of this Privacy Policy. This Privacy Policy is an integral part of the Application Service Use Agreement.

1. Scope of application

(a) The personal registration information that you provide according to the requirements of the Application when you register your account for the Application;

(b) application in your use of this web service, or access to this web application platform, the application automatically receive and record your browser and computer information, including but not limited to your IP address, browser type, the use of language, visit date and time, software and hardware feature information and the page you need to record data such as;

(c) Users' personal data obtained by the application from business partners through legal means.

You understand and agree that this Privacy Policy does not apply to the following information:

(a) the keyword information you enter when using the search service provided by the application Platform;

(b) Information data collected by the Application and published by you in the Application, including but not limited to participating in activities, transaction information and evaluation details;

(c) Violations of laws or rules of the App and measures taken by the App against you.

2. Use of information

(a) the application won't come to any irrelevant third party to provide, sell, rent, share or trade your personal information, unless get your permission in advance, or the third party and the application of this application (including affiliates) alone or together to provide the service for you, and at the end of the service, it will be banned from access to be able to access all the information including its before.

(b) The App also does not allow any third party to collect, edit, sell or disseminate your personal information for free by any means. If any user of the application platform is found to engage in the above activities, the Application has the right to terminate the service agreement with such user immediately.

(c) for the purpose of service users, the application may be through the use of your personal information, provide you with the information you have interested in, including but not limited to sent you product and service information, or to share information with this application partners so that they send you information about its products and services, which need your prior consent).

3. Information disclosure

Under the following circumstances, the application will disclose your personal information in whole or in part according to your personal will or legal provisions:

(a) Disclosed to a third party with your prior consent;

(b) Share your personal information with third parties in order to provide the products and services you require;

(c) Disclosure to a third party or administrative or judicial authority in accordance with the relevant provisions of the law or as required by administrative or judicial authorities;

(d) If you violate relevant Laws and regulations of China or the Application Service Agreement or relevant rules, you need to disclose to a third party;

(e) If you are a qualified INTELLECTUAL property complainant and have filed a complaint, disclose it to the Respondent at the request of the Respondent so that both parties can handle possible rights disputes;

(f) In a transaction created on the Application platform, if any party to the transaction performs or partially performs its transaction obligations and requests for information disclosure, the Application has the right to decide to provide the user with the contact information of the counterparty and other necessary information to facilitate the completion of the transaction or the settlement of disputes.

(g) Other disclosures deemed appropriate by the app in accordance with laws, regulations or policies of the Website.

4. Information storage and exchange

The information and data collected by the Application about you will be stored on the servers of the Application and/or its affiliates, and such information and data may be transmitted to your country, region or the country where the application collects the information and data, and accessed, stored and displayed outside the country.

5. Use of cookies

(a) If you do not refuse to accept cookies, the application will set or retrieve cookies on your computer

So that you can log in to or use the services or functions of the application platform that depend on cookies. Cookies in this application can provide you with more thoughtful personalized services, including promotion services.

(b) You have the right to choose to accept or reject cookies. You can refuse to accept cookies by modifying your browser Settings. However, if you choose to refuse to accept cookies, you may not be able to log in to or use the application network services or features that depend on cookies.

(c) This Policy applies to information obtained through cookies set by the Application.

6. Information security

(a) This application account has security protection function, please keep your user name and password information properly. This application will encrypt the user password and other security measures to ensure that your information will not be lost, abused or altered. Despite the aforementioned security measures, please note that there are no "perfect security measures" on information networks.

(b) When using the application network services to conduct online transactions, you will inevitably contact the counterparty or potential trading partner

7. Changes to this Privacy Policy

(a) If we decide to make changes to our Privacy Policy, we will post such changes in this Policy, on our website, and where we deem appropriate, so that you can understand how we collect and use your personal Information, who has access to it, and under what circumstances we may disclose such information.

(b) The Company reserves the right to modify this Policy from time to time, so please check it regularly. If there is any material change to this policy, the company will inform you through a notice on its website.

Party B discloses its personal information, such as contact information or postal address. Please protect your personal information and only provide it to others when necessary. If you find that your personal information is leaked, especially the user name and password of the application are leaked, please contact the customer service of the application immediately so that the application can take corresponding measures.