anna pizzinat orange

FTTxFTTxFTTxFTTx where x stays for Antenna: requirements where x stays for Antenna: requirements where x stays for Antenna: requirements where x stays for Antenna: requirements

on optical access/distribution network for new on optical access/distribution network for new on optical access/distribution network for new on optical access/distribution network for new

mobile backhaul architecturesmobile backhaul architecturesmobile backhaul architecturesmobile backhaul architectures

France Telecom Group

mobile backhaul architecturesmobile backhaul architecturesmobile backhaul architecturesmobile backhaul architectures

Anna Pizzinat, Philippe Chanclou, Fabien Le Clech, Bernard Landousies

France Telecom – Orange Labs Networks and Carriers

Contact: [email protected]

April the 25th 2012,

FTTx Summit Europe 2012, Chelsea Football Club, London

Contents

� FTTH deployments

� LTE is coming

� Can FTTH also Solve the Mobile Backhaul Problem?

� New mobile backhaul architectures based on an optical

2 France Telecom Group confidential

New mobile backhaul architectures based on an optical

distribution network and enabling fixed/mobile mutualisation

� Conclusions

Orange Labs R&D / A. Pizzinat FTTx Summit Europe 2012

FTTH deployment in France

� Mid 2011: 1.8 M «FTTH home passed» & 150000 FTTH «home connected »

FTTLA :400KFTTLA :400KFTTLA :400KFTTLA :400K

FTTH:150KFTTH:150KFTTH:150KFTTH:150K

3 France Telecom Group confidential Orange Labs R&D / A. Pizzinat – FTTx Summit Europe 2012

FTTH deployment in France:

ORANGE plan until 2015

� 3600 towns

� 10M homes

4 France Telecom Group confidential Orange Labs R&D / A. Pizzinat – FTTx Summit Europe 2012

Mobile networks: LTE (4G) is coming

� LTE promises significant performance improvements compared with

earlier radio interfaces:

– User available bit-rate ten times higher than 3G

– Reduced latency,

– Improved quality of service

– Ability to operate with advanced antenna systems

forecasts


� From 144k subscriptions in 2010, to 15M in 2011 to 458M in 2015.

Orange Labs R&D / A. Pizzinat – FTTx Summit Europe 2012

LTE subscriptionsand forecasts

(thousands)

source Idate Dec. 2011

ORANGE LTE deployment

� HSPA+ launch:

– 2011: coverage 50% of French population for business use

– April 2012: launch of commercial offer for privates and 60% coverage

� LTE France:

– Marseille Orange City commercial launch by June 2012


– Marseille Orange City commercial launch by June 2012

– 4 more cities by end 2013

– The biggest French agglomerations (12) in 2013

� And at the same time LTE is coming in Spain, Belgium, Luxembourg,

Moldavia, ….


Can PONs also Solve the Mobile Backhaul Problem?

Central Office

coupler

coupler

OLT

CSG

(cell site gateway)

aggregation network

E1

FE

2G

BTS

nodeB

CoreNetwork

BSC

RNCONT

GE

enodeB

EPC


� In terms of supported data rate:

UserUserUserUser equipmentequipmentequipmentequipment

peakpeakpeakpeak raterateraterate

TypicalTypicalTypicalTypical backhaulbackhaulbackhaulbackhaul throughputthroughputthroughputthroughput

for one for one for one for one cellcellcellcell

BackhaulBackhaulBackhaulBackhaul

technologiestechnologiestechnologiestechnologies

PON PON PON PON

compatibilitycompatibilitycompatibilitycompatibility

3G

HSPA

DL 14.4Mbit/s ~20 Mbit/s Copper, fiber,

microwave

GPON

LTE DL 100Mbit/s

UL 50Mbit/s

200 to 800 Mbit/s

depending on radio config.

Fiber or

microwave

XGPON

LTE-A DL 1Gbit/s

UL 500Mbit/s

2 to 8 Gbit/s ? Fiber NGPON2?


Can PONs also Solve the Mobile Backhaul Problem?

� Probably yes, but besides throughput, LTE and LTE-A have other

requirements as:

– X2 interface delay between neighboring cells <5ms for LTE R11

– Coordinated Multi-Point (CoMP) inter cells

– If the cell site is not secured, IPSec is needed.

� Is this the best backhaul solution?


� Keeping into account that

– Typically, mobile network evolution and deployment are much faster than the

fixed network ones

– The market size is quite different (15000-20000 cell sites but several millions of

potential FTTH customers in France)

– Radio Access Network (RAN ) is changing day by dayRadio Access Network (RAN ) is changing day by dayRadio Access Network (RAN ) is changing day by dayRadio Access Network (RAN ) is changing day by day


RRU

coax

D-RoF

RRH

RRH

RRH

D-RoF

RRH

~15kg

Step 1: Macro base

station

Step 2: Distributed base

station with « traditional »

backhaul


RRU

RRU

RRUS

yste

m

mod

ule

BBU

Sys

tem

m

odul

e

BBU

RRU: Remote Radio Unit

RRH: Remote Radio head

BBU: BaseBand Unit

CSG: Cell-site Gateway

D-RoF: Digital Radio over fiber

(CPRI or OBSAI standard)

CSG

� RRH close to the antenna

� Energy savings

� Deployed

� But, if cell site is not secured

(>50% cases) IPSec is needed

adding OPEX and CAPEX


Step 3: BBU hostelling with stacking (or BBU centralisation)

� BBU colocalised in secured CO (no need for IPSec)

� X2 optimisation,

� Future proof with respect to LTE-A evolutions (CoMP support)

� Energy and deployment savings (expected 20%)

� Feasible today

-RRH

RRH

RRH

Central Office


optical

distribution

network

RRH

RRH

RRH

IP/MPLS IP/MPLS IP/MPLS IP/MPLS

networknetworknetworknetwork

D-RoF

S1S1S1S1

X2X2X2X2

Central Office

BBU Sys

tem

m

odul

e

BBU Sys

tem

m

odul

e

BBU

Sys

tem

m

odul

e

MASG

FronthaulFronthaulFronthaulFronthaul BBBBackhaulackhaulackhaulackhaul

EPC

D-RoF


Step 4: C-RAN (or BBU hostelling with resource pooling)

RRH

RRH

RRH

Central

OfficeD-RoF

RRH

RRH

RRH

� Same advantages as step 3, plus

� Less interfaces to core network (S1 and X2)

� Simplification of mobility management

� CAPEX savings due to reduced BBU number

� Trials ongoing

-


optical

distribution

network

RRH

RRH

RRH



S1S1S1S1

X2X2X2X2

Office

BBU

Sys

tem

m

odul

e

Lo

ad

bal

anci

ng

FFFFronthaulronthaulronthaulronthaul BBBBackhaulackhaulackhaulackhaul

RRH might be replaced by Active Antenna Arrays (AAA):

new antennas with integrated RRH


Which optical distribution network for the fronthaul?

� BitBitBitBit----rate rate rate rate requirementsrequirementsrequirementsrequirements: : : :

– Radio signal digitisation: CPRI bit-rates are quite high compared to the real data rate

available to the user, ex.: LTE 20MHz 2x2 MIMO→ 2.457Gbit/s for each sector2.457Gbit/s for each sector2.457Gbit/s for each sector2.457Gbit/s for each sector

– Today radio configuration for LTE only: 3 RRHs with a total 3x2.457Gbit/sToday radio configuration for LTE only: 3 RRHs with a total 3x2.457Gbit/sToday radio configuration for LTE only: 3 RRHs with a total 3x2.457Gbit/sToday radio configuration for LTE only: 3 RRHs with a total 3x2.457Gbit/s

– Complete radio configuration for LTEComplete radio configuration for LTEComplete radio configuration for LTEComplete radio configuration for LTE----A + 3G+ 2G: up to 12 RRHs up to 20Gbit/sA + 3G+ 2G: up to 12 RRHs up to 20Gbit/sA + 3G+ 2G: up to 12 RRHs up to 20Gbit/sA + 3G+ 2G: up to 12 RRHs up to 20Gbit/s

� Fibre Fibre Fibre Fibre availabilityavailabilityavailabilityavailability: : : :

– Already a requirement Already a requirement Already a requirement Already a requirement for LTE backhaul

→ 90% Orange France cell sites in dense areas


→ 90% Orange France cell sites in dense areas

have fibre

– Max fibre length for DMax fibre length for DMax fibre length for DMax fibre length for D----RoF: 40km RoF: 40km RoF: 40km RoF: 40km

→ 96% Orange France links shorter than 10km

In urban areas up to 28 cell sites are connected

to one CO (based on existing topology)


Which optical distribution network for the fronthaul?

N.N.N.N. fibers for fibers for fibers for fibers for

cellcellcellcell sitesitesitesite

Maturity/ Maturity/ Maturity/ Maturity/

availabilityavailabilityavailabilityavailability

CostCostCostCost CommentsCommentsCommentsComments

Point to point 1 for each

RRH

Ok Not efficient usage of fibers

Point to point

with RRH

chaining

1 every 2-3

RRHs

RRH chain? More efficient usage of fibers

but creation of single point of

failure on RRH chain

Passive 1 or 2 Ok Colorized interfaces,


Passive

CWDM

1 or 2 Ok Colorized interfaces,

1λ/RRH, 16λ available

Self seeded

WDM PON

1 Tests up to

2.5Gbit/s

Colorless interfaces, 32λ available. Promising but

needs at least 2.5Gbit/s and

standardization

CPRI over

OTN

1 or 2 Ok High cost of active WDM

equipment

CPRI compression is under studyCPRI compression is under studyCPRI compression is under studyCPRI compression is under study

The last three solutions may be either on new infrastructure or existing PON ODN The last three solutions may be either on new infrastructure or existing PON ODN The last three solutions may be either on new infrastructure or existing PON ODN The last three solutions may be either on new infrastructure or existing PON ODN


Regulation aspects?

� In France incumbent wireline access operators must publish backhaul

wholesale offers available to every mobile operators (to prevent

incumbent operator to benefit from their position in wireless market).

� In France competitive wholesale offers suitable for the fronthaul

segment do exist.

Does this hold also for other countries?


� Does this hold also for other countries?


An opportunity for fixed/mobile mutualisation

� FixedFixedFixedFixed and mobile fonctions in the and mobile fonctions in the and mobile fonctions in the and mobile fonctions in the samesamesamesame aggregationaggregationaggregationaggregation pointpointpointpoint:::: NGPoPNGPoPNGPoPNGPoP

� This yields also to consolidation of central officesThis yields also to consolidation of central officesThis yields also to consolidation of central officesThis yields also to consolidation of central offices

� Different levels of convergence:

– Location mutualisationLocation mutualisationLocation mutualisationLocation mutualisation

– Fibre infrastructure mutualisationFibre infrastructure mutualisationFibre infrastructure mutualisationFibre infrastructure mutualisation ????

– Equipement mutualisationEquipement mutualisationEquipement mutualisationEquipement mutualisation


NGNGNGNG----PON2PON2PON2PON2

Point to point with WDM

Via existing infrastructure

RRHRRH

RRH

BBU card

fixed/mobile

equipment

OLT card



NGPoP


Conclusions – Take away

� Following RAN splitting, also mobile backhaul is evolving towards

a new fronthaul segment plus a backhaul (aggregation) segment

� BBU hostelling (C-RAN) based on D-RoF is very promising for

radio access network optimization

� A key aspect is the Optical Distribution Network in order to


� A key aspect is the Optical Distribution Network in order to

guarantee an efficient usage of fibers and minimize costs:

– WDM PON

� For convergent and integrated operators this new mobile For convergent and integrated operators this new mobile For convergent and integrated operators this new mobile For convergent and integrated operators this new mobile

backhaul architecture opens to fixed/mobile backhaul architecture opens to fixed/mobile backhaul architecture opens to fixed/mobile backhaul architecture opens to fixed/mobile mutualisationmutualisationmutualisationmutualisation and is and is and is and is

in the same direction of FTTH nodes consolidationin the same direction of FTTH nodes consolidationin the same direction of FTTH nodes consolidationin the same direction of FTTH nodes consolidation


thank you

France Telecom Group

Orange, the Orange mark and any other Orange product or service names referred to

in this material are trade marks of Orange Personal Communications Services Limited.

© Orange Personal Communications Services Limited.

France Telecom Group restricted.

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