fixed and mobile convergence: which role for optical...

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Fixed and Mobile Convergence: Which Role for

Optical Networks?

S. Gosselin, A. Pizzinat, X. Grall, ORANGE

D. Breuer, E. Bogenfeld, DTAG

J. Torrijos Gijon, TELEFONICA

A. Hamidian, N. Fonseca, ERICSSON

Optical Fiber Communication Conference and Exposition

March 26, 2015, paper Th3H.2

OFC – Los Angeles – 3/26/2015 – Th3H.2 1


What is network Fixed and Mobile Convergence (FMC)


Common architecture for fixed and mobile network requires interaction at different points: Structural convergence

Common use of resources e.g. infrastructure, technology, interfaces, transport mechanisms

Functional convergence Unification of fixed and mobile

network functions

Fixed and mobile networks

are developed independently of each other

have only very limited joint usage of infrastructure

have independent network operation, control and management

FMC only at service level (e.g. IMS)

Aggregation Network

Fixed Core

Mobile Core

Fixed

access

Radio access

Today‘s network architecture Potential converged architecture

Aggregation

Network

Fixed Core

Mobile Core

Fixed access

Radio access

Functional

convergence Structural

convergence

Functional

convergence

Functional

convergence


Why network FMC is needed for 5G design


• Increasing number of users and

connected devices

• Need to access any content any

time anywhere with any device

(ATAWADAC)

• Bandwidth-hungry usages of

fixed and mobile customers,

driven by video streaming

• Increasing Wi-Fi traffic coming

from mobile terminals

• A resulting tight price pressure

on telcos requiring significant

CapEx and OpEx reductions

• Unification of hardware resources (equipment, cables, sites, etc.) for both fixed and mobile services

• Cost and energy savings

• Simplification of fixed and mobile network architectures

• Ease of use and ease of operation

• Network FMC will enable a 5G infrastructure with end-to-end management and orchestration capabilities

Drivers Expected benefits from network FMC


Example of use case: “Converged access and aggregation

technology supporting fixed and mobile broadband services”

The objective is a universal access and aggregation technology allowing

appropriate scaling with respect to the fixed and mobile traffic growth

and the increasing number of mobile base stations and interconnected

devices



Several triggers of structural convergence will impact

optical network evolution (1)

■ Heterogeneous Radio Access Networks

♦ larger number of antenna locations

♦ required RAN coordination (small and macro cells)

♦ much more capillarity and dynamicity required from back-/fronthauling infrastructures



Backhaul and fronthaul with COMP coord interface


X2 interfaces are collocated, X2 delay close to zero

Fulfils inherently X2 delay requirements for COMP <0,5ms

An interconnection of X2-Interface required, link distances between sites will cause delay.

To support COMP delay requirements < 0,5ms requires interconnection of CO or Main CO location

BACKHAUL FRONTHAUL

Backhaul: X2 interconnection on CO/Main CO required to support COMP with delay requirements < 0,5ms

Fronthaul: Fulfils inherently X2 delay requirements for COMP <0,5ms

RU

Backhaul

Network Mobile

core

RU BBU

BBU

X2-

S1-

S1-

Backhaul

Network Mobile

core

RU

BBU

BBU X2-

S1-

S1- RU CPRI-

CPRI-

BBH hotel


Several triggers of structural convergence will impact

optical network evolution (2)

■ Mobile fronthaul and Cloud Radio Access Networks (C-RAN)

♦ Stringent requirements in line rate (multi-Gbit/s) and latency (100-500 µs

Round Trip Time)

♦ These requirements should strongly foster WDM-based access systems,

either on dedicated or shared fibre infrastructure



A unified optical access / aggregation network will also

foster structural convergence

■ Requirements of a unified optical access / aggregation

♦ Converged physical layer functions supporting heterogeneous

access services for fixed, mobile and Wi-Fi

♦ Low latency ( 100-500 µs) and high capacity (~10 Gbit/s/l)

♦ Seamless interoperability with fixed/mobile network elements

♦ Dynamicity, scalability, survivability, carrier-grade operations

♦ Compatibility with legacy networks and infrastructures

• e.g. existing Optical Distribution Networks

■ Key technologies for a unified optical access / aggregation

♦ TDM/TDMA and WDM for data plane, SDN for control

♦ Different flavors could be considered, based on NG-PON2 or

DWDM photonic transport technologies



Two alternative scenarios to foster structural

convergence

Two main approaches for

structural transport

convergence in COMBO:

1) Access technologies

and topologies

extending into the

aggregation segment

2) Aggregation

technologies and

topologies extending

into the access segment



Example of fronthaul implementation based on

NG-PON2 converged access


Cabinet CO Main CO Core CO

2G 3G 4G

FTTC

FTTH

Business

Residential + SME

Router

CPRI

BBU hotel

Eth

Power Splitter (PS)

IP/MPLS Backbone

Mobile Core

Wi-Fi Core

MASG

Fixed Core

IP

Internet

Aggregation IP/MPLS

BNG

CoMP controller

LER

CEx

RGW

RGW

RNC BSC

Macro site

ONU

ONU

NGPON2 OLT

NGPON2 TWDM ONU

NGPON2 P2P WDM ONU

TWDM

PtP WDM

AWG

User

UE

4G

4G

ONU

ONU

RF

RF

NT

Wi-Fi AP

or PS

ONU

ONU

RRH

Multi-port ONU

Femto cell

Public outdoor or indoor SC

ONU VDSL2 Vectoring

DSLAM

TWDM

TWDM

n x CPRI

DWDM

Band-filter


Example of fronthaul implementation based on

programmable DWDM converged aggregation


Cabinet CO Main CO Core CO

2G 3G 4G

DSLAM

FTTC

FTTH

Business

VDSL2 Vectoring

Residential + SME

Router

CPRI

BBU hotel

Eth

Power Splitter (PS)

IP/MPLS Backbone

Mobile Core

Wi-Fi Core

MASG

Fixed Core

IP

Internet

Aggregation IP/MPLS

BNG

LER

RGW

RGW

RNC BSC

Macro site

ONU NGPON2 TWDM ONU

Progr. DWDM Interface

User

NT

Wi-Fi AP

UE

4G

4G ONU RF

RF

ROADM n x CPRI

DWDM mux

ONU

NG-PON2 OLT

or GPON

CoMP controller

CPRI RRH DWDM

mux

Femto cell

Public outdoor or indoor SC

UE

TWDM PON

ONU


Summary and conclusion

■ Structural convergence is defined as pooling / sharing of network

and infrastructure resources for several network types (fixed, mobile

and Wi-Fi)

♦ It will allow true integration of fixed and mobile networks

■ Structural convergence will be triggered by:

♦ Heterogeneous RANs

♦ Mobile fronthaul and Cloud RAN

■ A unified optical access / aggregation network with low latency and

high capacity will also foster structural convergence

■ Two main approaches can be considered for structural convergence

♦ access pushed into aggregation, based e.g. on NG-PON2 incl. WDM

♦ or aggregation pushed into access, based e.g. on programmable

DWDM technologies

■ Network FMC is fundamental for future 5G infrastructure in order to

achieve a flexible network with E2E management and orchestration

capabilities



Acknowledgments

■ This ongoing work receives funding from the European Union's

Seventh Framework Programme (FP7/2007-2013) under grant

agreement n° 317762 “COMBO project”

■ Many thanks to all contributors of COMBO project for valuable inputs

and fruitful discussions


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