NTT DOCOMO

Oct.2016No.2vol.18

Technology Reports (Special Articles)

● What We Can Do

DOCOMO Today

Special Articles on Introducing the 3.5-GHz Band

● NTT DOCOMO’s Efforts Concerning Technical Developments for Introducing TD-LTE in 3.5-GHz Frequency Band

● Base-station Equipment with the Aim of Introducing 3.5-GHz Band TD-LTE

● Base Station Antennas for 3.5-GHz Band

● High-precision Clock-time-synchronization Network Equipment for Introduction of 3.5-GHz Band TD-LTE

● Router-type Mobile Terminal for TD-LTE in 3.5-GHz Band

Technology Reports (Special Articles)

Special Articles on LTE-Advanced Release 13 Standardization

● LTE-Advanced Release 13 Standardization Technology Overview

● New Technologies for Achieving IoT in LTE Release 13

● Broadband Frequency Technologies in LTE-Advanced Release 13

● LTE-Advanced Release 13 Multiple Antenna Technologies and Improved Reception Technologies

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Vol.18 No.2 Oct. 2016

What We Can Do ······························································································ 1

Kazuhiro Watanabe

Special Articles on Introducing the 3.5-GHz Band

NTT DOCOMO’s Efforts Concerning Technical Developments for Introducing TD-LTE in 3.5-GHz Frequency Band ······························· 4

Base-station Equipment with the Aim of Introducing 3.5-GHz Band TD-LTE ···· 8

Base Station Antennas for 3.5-GHz Band ··············································· 14

High-precision Clock-time-synchronization Network Equipment for Introduction of 3.5-GHz Band TD-LTE ··············································· 18

Router-type Mobile Terminal for TD-LTE in 3.5-GHz Band ··············· 27

Special Articles on LTE-Advanced Release 13 Standardization

LTE-Advanced Release 13 Standardization Technology Overview ····· 32

New Technologies for Achieving IoT in LTE Release 13 ··················· 39

Broadband Frequency Technologies in LTE-Advanced Release 13 ···· 52

LTE-Advanced Release 13 Multiple Antenna Technologies and Improved Reception Technologies ··························································· 62

CA TD-LTE 3.5-GHz Band

High-density BDE 3.5-GHz Band TD-LTE

Remote Tilt Base Station Antenna 3.5-GHz Band

UTC TD-LTE

3DL CA TD-LTE 3.5-GHz Band

Release 13 3GPP

eDRX NB-IoT M1

Unlicensed Frequency Utilization DC CA

BS IRC AAS

（P.27）

AAS

Transceiver unit

Transceiver unit

・・

・

Antenna

TAB connector (reference point for conducted requirement)

Range of AAS RF specifications

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・・・

（P.62）

（P.8）

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Improving IP-based OSS Reliability During Large-scale Disasters ····· 72

2015 Wireless Innovation Forum Technology of the Year Award ····· 78

IP-based OSS

Technology Reports (Special Articles) NTT DOCOMO’s Efforts Concerning Technical Developments for Introducing

TD-LTE in 3.5-GHz Frequency Band (P.4)

CA by advanced C-RAN architecture

Backup system

Image of the two IP-based OSS bases

Tokyo

Osaka

Nagano

Old IP-based OSS system 1 (SBY)

Old IP-based OSS system 0 (ACT)

Two bases (remote cluster)

New IP-based OSS system 1 (SBY)

（P.72）

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Macro cell Small cell

CA CA CA

Baseband unit

HO HO

Radio units with small size

Achieves CA between a macrocell and multiple add-on cellsby adding small cells inside themacro cell in a high-traffic area

Achieves CA byoverlapping macrocell

Achieves CA by spotdeployment of a smallcell

Consolidates basebandprocessing to performcontrol operations

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