Flexible Access System Architecture (FASA) for the Next...
Transcript of Flexible Access System Architecture (FASA) for the Next...
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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
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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
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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
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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”.
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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.
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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
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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
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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
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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.
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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
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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
11 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
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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
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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
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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
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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.
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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.
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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
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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.
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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.
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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
…
…
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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.
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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.