April 2017 Vol. 15 No. 442017

https://www.ntt-review.jp/archive/2017/201704.html

Feature Articles
Keynote Speeches at NTT R&DForum 2017
Hiroo Unoura, President and Chief Executive Officer, NTT
Hiromichi Shinohara, Senior Executive Vice President
and Head of Research and Development Strategy
Department, NTT

Feature Articles
NTT Tsukuba Forum 2016 Workshop
LecturesResearch and Development Activities toward Smart andFlexible Future Network: NetroSphere Concept
Flexible Access System Architecture: FASA
Research and Development of Innovative Operation
Technology for Access Network Infrastructure
Wireless Access Technologies to Enable a Variety ofServices

Regular Articles
Low Latency Dynamic Bandwidth Allocation Method with High Bandwidth Efficiency for TDM-PON

Global Standardization Activities
Report on ITU Telecom World 2016 and ITU Kaleidoscope 2016

Practical Field Information about Telecommunication
Technologies
Case Study of Bolt Corrosion in Remote Subscriber Module-Feeder Point

Information
Event Report: Tsukuba Forum 2016

Short Reports
NTT, Ruhr-Universität Bochum, and Kobe University Develop a New Cryptanalytic Technique toImprove the Design of Lightweight Ciphers for Internet of Things

Feature Articles
Keynote Speeches at NTT R&D Forum 2017

Hiroo Unoura, President and Chief Executive Officer, NTT▼Overview

This article introduces NTT Group initiatives to promote the B2B2X(business-to-business-to-X) business model. The content of this article is based on alecture presented by Hiroo Unoura, NTT President and Chief Executive Officer, at NTT
R&D Forum 2017 held in February 2017.

Hiromichi Shinohara, Senior Executive Vice President andHead of Research and Development Strategy Department, NTT▼Overview

This article introduces NTT’s research and development (R&D) activities for creating
new value through collaboration with various partners to promote the B2B2X(business-to-business-to-X) business model under the NTT Group’s medium-term
management strategy, Towards the Next Stage 2.0. It is based on a lecture presented
by Hiromichi Shinohara, NTT Senior Executive Vice President and Head of the
Research and Development Strategy Department, at NTT R&D Forum 2017, which washeld in February 2017.

Feature Articles
NTT Tsukuba Forum 2016 Workshop Lectures

Research and Development Activities toward Smart andFlexible Future Network: NetroSphere Concept▼Abstract

The NTT laboratories announced the NetroSphere concept in March
2015 with the aim of creating future networks that support the Hikari
Collaboration Model (business model to wholesale fiber access). This
article introduces our recent efforts concerning NetroSphere andexplains the importance of creating future smart and flexible networks
based on the NetroSphere concept in order to accommodate thedigitization of various industries and the rapid growth of multiple Internetof Things services. These Feature Articles are based on lectures given
during workshops at the Tsukuba Forum 2016 held on October 26, 2016.

Regular Articles

Low Latency Dynamic Bandwidth Allocation Method withHigh Bandwidth Efficiency for TDM-PON▼Abstract

This article describes a low latency dynamic bandwidth allocation(DBA) method with high bandwidth efficiency that is intended for use incampus area networks and mobile fronthaul based on TDM-PON (timedivision multiplexing passive optical network). These network systems
require low latency of under 100 μs and high bandwidth efficiency. Our
method involves only three steps for allocation and employs anadaptive DBA cycle depending on the traffic load. We implemented it on
a 10-gigabit Ethernet passive optical network (10G-EPON) media access control system-on-a-chip andevaluated the allocation results and the latency on the 10G-EPON system. Our DBA achieved a minimum
latency of 60 μs with priority control and high bandwidth efficiency, depending on traffic.