Flexible Access System Architecture (FASA) for the Next...

Copyright©2016 NTT corp. All Rights Reserved.

Flexible Access System Architecture (FASA) for the Next-Generation Optical Access Network Development

1st July, 2016

Jun-ichi Kani

NTT Access Network Service Systems Laboratories, NTT Corporation

NGON 2016 – Nice

1 Copyright©2016 NTT corp. All Rights Reserved.

Outline

Trends in broadband access services and technologies Trend in broadband services in Japan

New broadband strategy in NTT and new services combining mobile and fiber

Evolution of mobile broadband technology and mobile fronthaul

Flexible Access System Architecture (FASA) Operators’ issues

FASA – concept, architecture, etc.

Use cases

Related works

Access Network Slicing

Summary


1,000,000

10,000,000

100,000,000

Trends in broadband services in Japan

ADSL

CATV

Nu

mb

er o

f su

bsc

rib

ers

BWA: Broadband mobile wireless access using 2.5-GHz band ~ Mobile WiMAX Reference: An announcement from Japanese Ministry of Internal Affairs & Communications

BWA

FTTH

LTE


New broadband strategy in NTT

NTT has changed the broadband business strategy from B2C (Business to Customer) to B2B2C (Business to Business to Customer).

We have started wholesaling fiber access according to this strategy. • This business model is called “Hikari Collaboration Model”.


Number of partners and end users

https://www.ntt-east.co.jp/info/detail/160324_01.html

Number of end users

Number of partners (retail providers)

1 million

2 million

3 million

Number of partners and end users in the Hikari Collaboration Model (in NTT East only)

The number of partners exceeded 300 in NTT East.

The partners include MNOs, MVNOs, ISPs, local cable-TV operators, rental-video companies, etc.


New services combining mobile and fiber

Mobile network operators start providing (1) more affordable rates, (2) one-stop service and (3) new services combining mobile and fiber using the wholesale FTTH infrastructure.

https://www.nttdocomo.co.jp/english/corporate/ir/binary/pdf/library/presentation/150129/docomohikari_e.pdf


Evolution of mobile broadband technology LTE (3.9G)

LTE-Advanced (4G)

5G

3GPP std.

Release Release 8, 9 Release 10 to 13 Release 14, 15

Development 2008 to 2010 2011 to 2015 Started in 2016

Commercialization (in Japan)

Dec 2010 (NTT docomo)

Mar 2015 (NTT docomo)

2018 to 2020?

Maximum speed per User Equipment

Commercial 75~150 Mbps 250~500 Mbps ?

Standard ~300 Mbps ~4 Gbps (~26 Gbps) ~10 Gbps

Frequency bands (in Japan)

700 to 900MHz, 1.5 to 2.1GHz, etc

2.5GHz band, 3.5GHz band, etc

Also over 6GHz?

Technologies •Carrier Aggregation •Inter-cell coordination •Small-Cell Enhancement •C/U split Etc

•New Radio Access Technologies (New RAT) •Massive MIMO Etc


RAN for the 4G and 5G mobile services

Small cells (e.g. lower SHF;

<6GHz)

Macro cell (UHF band)

Spot cells (e.g. higher SHF;

>6GHz, EHF band)

5G~

Small cells (e.g. lower SHF;

<6GHz)

Macro cell (UHF band)

U-plane

C-plane, U-plane

4G~

References Y. Okumura, et al., “Future Radio Access – Mobile Optical Network: Part 1,” IEICE Technical Report, RCS2013-231 (in Japanese), Y. Okumura, et al., “Future Radio Access – Mobile Optical Network: Part 2,” IEICE Technical Report, RCS2013-232 (in Japanese).

U-plane

C-plane


Future OLT

TWDM-PON for dense small cells (1/2)

l mux

Transceivers l1 l2 l3 l4

TWDM-PON in ITU-T G.989 series (NG-PON2) will allow concentration and dispersion of wavelength resources.

In the next generation fronthaul, the optical bandwidth per cell changes depending on the amount of real traffic, for which the bandwidth and wavelength resources can be properly assigned.


Future OLT

TWDM-PON for dense small cells (2/2)

l mux

Transceivers l1 l2 l3 l4

The wavelength resources can be re-allocated to adapt to the concentration or the dispersion of the traffic according to users’ travel.

Traffic concentration


Future optical access systems

Diversification of services and requirements

Support of emerging new services by VNOs

Support of small cells and spot cells by MNOs

Flexible Access System Architecture (FASA)

Optical Access Systems will evolve from FTTH infrastructure to the common access platform for various VNOs/MNOs


Outline

Trends in broadband access services and technologies Trend in broadband services in Japan

New broadband strategy in NTT and new services combining mobile and fiber

Evolution of mobile broadband technology and mobile fronthaul

Flexible Access System Architecture (FASA) Operators’ issues

FASA – concept, architecture, etc.

Use cases

Related works

Access Network Slicing

Summary


Operators’ issues

Optical access

Fronthaul (MNO A)

Fronthaul (MNO B)

FTTH FTTB

Ｓ

Hardware A Firmware A

Hardware B Firmware B

Hardware C Firmware C

Hardware D Firmware D

Various access schemes

Vender-dependent and single-purpose

equipment

Evolving services (5G mobile, next-gen wireless

LAN, etc.)

It is difficult to quickly add/change functions for new services. It is difficult to customize functions to each retail provider in case of wholesaling access. Inaccurate demand forecast leads to wasteful investment or shortage of each equipment.

MNO: Mobile Network Operator FTTB: Fiber To The Business


FASA – Flexible Access System Architecture

NTT’s new concept to address these issues by the help of virtualization technologies. References NTT Press Release, “Introducing the New FASA Concept for Future Access Systems,” Feb 8, 2016. Lightwave Online, “NTT's Flexible Access Systems Architecture envisions white-box OLTs,” Feb 11, 2016. Etc.

FASA-based OLT

Common hardware

Bandwidth

control

Wavelength

control

OAM Multicast

TWDM-PON MAC/PHY ...

Logi

cal c

onfig

urat

ion

(con

cept

ual i

mag

e)

Software modules

External hardware module

New

function

Replace depending on the requirement

Service achieved by combining modularized functions


APIs for FASA

In order to enable simple and easy function add-on, a commonly usable APIs (Application Programming Interfaces) are very important.

汎用ハードウェア

マルチキャスト

API

帯域制御

外付けモジュール外付けモジュール・・・

波長制御

OAM (監視制御)

・・・

仮想化OLT

Interface for configuration /

status acquisition

新機能 X ソフトウェア部品

（部品化された機能）

新機能 Y

Common hardware

Multicast

APIs

Bandwidth

control

External module External module ・・・

Wavelength

control OAM ・・・

FASA OLT

New

feature

X Software components

(Modularized functions)

New

feature

Y

New

feature

Z

Reference FASA White Paper, http://www.ansl.ntt.co.jp/j/FASA/index.html


FASA provides broadband service for residential customers, same as the current systems.

FASA aims to flexibly update/replace the functions (e.g. DBA) by updating a software without rebooting the OLT/ONUs.

Use case of FASA: Residential service

OLT

PS CO

ONU

ONU

ONU Flexible function update by software update

SR-DBA v.1.0

SR-DBA v.2.0

CO: Central Office DBA: Dynamic Bandwidth Assignment

PS: Power Splitter SR: Status Report

K. Asaka and J. Kani, Contribution in FSAN Louisville meeting, June 2016.


In 5G mobile system, dense small cells could be accommodated by a PON as MFH, which has an advantage in terms of low CAPEX of physical infrastructure.

By replacing the DBA software from SR-DBA to LL-DBA, TDM-PON-based MFH can be realized. This avoids re-building the OLT from the beginning.

Use case of FASA: 5G mobile fronthaul (MFH)

PS CO

CU

OLT RU

RU

RU

Share one feeder fiber

Share one physical interface

SR-DBA

LL-DBA

CU: Central Unit LL: Low Latency RU: Remote Unit

Agile service adaptation by software replacement

K. Asaka and J. Kani, Contribution in FSAN Louisville meeting, June 2016.


Central Office Re-architected as a Datacenter (CORD) A collaborative effort between AT&T and the Open Networking Lab (ON.Lab).

The goal is to allow Telcos to benefit from both

‒ the economies of scale (infrastructure constructed from a few commodity building blocks) and

‒ the agility (the ability to rapidly deploy and elastically scale services).

References ‒ Larry Peterson (ON.Lab), IEEE Software Defined Networks - Newsletter, “CORD:

central Office Re-architected as a Datacenter (CORD), November 2015. ‒ Presentations in ONS Inspire! Webinar “CORD: Central Office Re-architected as a

Data center,” Nov 17, 2015.

ONU CPE PON OLT

MACs

ONOS + OpenStack + XOS

vOLT, vCPE, vBNG, vCDN


Challenges for deeper softwarization

Presentation W3F.1 in this OFC proposes virtualization of EPON OLT functions with a challenge to realize software-based Multi-Point MAC Control (MPMC).

K. Nishimoto et al, “Virtualization of EPON OLT functions and collision suppression techniques for Multi-Point MAC Control,” OFC 2016 W3F.1.


Evolution of FASA

PON OLT Hardware

Band-width

control

Power saving OAM …

Access control

Encryption

PHY processing

Optics

API API

Band-width

control

Power saving

…

OAM

Hardware

Access control

Encryption

PHY processing

Optics

Server

Virtualization

Deep softwarization

Access network equipment

Access network equipment

Modularization of various functions is highly expected in the near term.

Further discussions in forums and standard bodies are expected on (1) which functions should be virtualized and (2) how deep the access network functions should be softwarized.


Virtualization of mobile functions: Virtual Broadband Unit (vBBU) in C-RAN Advantages

Computation resources can be flexibly allocated to each virtual BBU on demand.

The BBU function can be dynamically reconfigured and adjusted.

Reference Chih-Lin I, et al, “Recent Progress on C-RAN Centralization and Cloudification,” IEEE Access, volume 2, pp. 1030-1039, 2014.

RRH RRH

RRH RRH

BBU Pool

Mobile Fronthaul

General Purpose Processor Platform

Hypervisor

Real Time OS

BBU 1 Phy/Mac

Real Time OS

BBU 2 Phy/Mac

Real Time OS

BBU n Phy/Mac

…

…


Access network slicing

ONU

ONU ONU

ONU RRH

RRH

OLT

BBUs

Core network infrastructure

Switch and

Aggre-gation

Agge-gation

Core network slice (fixed)

Base Station

Core network slice (mobile)

Functions for VNOs/MNOs

Infrastructure (Modularized equipment,

NFVI in future?)

Local controller

Global controller

Local controller …..

Modularization, softwarization and virtualization make it easy to realize the access network slicing. This will drive the construction of the common access platform for various VNOs/MNOs.


Summary

Optical Access Systems will evolve from FTTH infrastructure to the common access platform for various VNOs/MNOs

Flexible Access System Architecture (FASA) based on modularization of access-network functions will address diversification of services and requirements.


Thank you for your attention!

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