IEEEHPSRConference|Budapest,2015July1-4|FMCTutorial|StructuralConvergence 11

ThisongoingworkreceivesfundingfromtheEuropeanUnion'sSeventhFrameworkProgramme(FP7/2007-2013)undergrantagreementn°317762“COMBOproject”

Fixed–mobileConvergence:StructuralconvergenceMoSvaSonandtechnologicaltriggers

DirkBreuerTiborCinkler

StéphaneGosselinAnnieGraveyAliHamidianStefanHöst

TaharMamouniPéterOlaszi

StephanPachnickeBjörnSkubic

JoseTorrijosGijón

DeutscheTelekomLaboratories,GermanyBudapestUniversityofTechnologyandEconomics,HungaryOrangeR&D,FranceTelecomBretagne,FranceEricssonResearch,SwedenLundUniversity,SwedenOrangeR&D,FranceAITIAInternaSonal,Inc.,HungaryADVAOpScalNetworkingSE,GermanyEricssonResearch,SwedenTelefónicaInvesSgaciónyDesarrollo,Spain

IEEEHPSRConference|Budapest,2015July1-4|FMCTutorial|StructuralConvergence 22

MoSvaSon

Inthepast,fixedandmobileaccessnetworkshavebeenopNmizedandevolvedindependently,withpartlycontradicNngtrends

IMS/TISPAN Service Control LayerIPTV Web …

OSS, Synchronization, Platform Control

Network Control Layer

IP/MPLSBackbone

“5G”

2G/3G

Wi-FiEdge Router

Converged Broadband Fixed and Mobile

Access/Aggregation Network

4G(LTE/LTE-Advanced)

Macro

λNλ1

λNλ1…

…

OLT

BBU-H

OLT

BBU-H

Mobile Core Components

S-GW P-GW

MME4G

SGSN GGSN2G/3G MSC

Fixed Core ComponentsBB-RAR LER

Mobile

Pico

IEEEHPSRConference|Budapest,2015July1-4|FMCTutorial|StructuralConvergence 33

Networkconvergencecoversfixed,Wi-Fiandmobilenetworks

Fixed and mobile networks: §  developed independently of each

other §  have only very limited joint usage of

infrastructure §  have independent network operation,

control and management

§  Common architecture for fixed and wireless network requires interaction at different points

§  Structural convergence §  Simplification and common use of resources

e.g. infrastructure, system technology, interfaces and transport mechanisms

§  Focus on access and aggregation network §  Functional convergence

§  Unification of fixed and mobile network functions

§  Focus on functional placement in home, access, aggregation and core network

Aggregation Network

Fixed Core

Mobile Core

Fixed access network

Radio access network

Aggregation

Network

FixedCore

MobileCore

Fixedaccess

Radioaccess

Functionalconvergence

Structuralconvergence

Functionalconvergence

Functionalconvergence

Today'snetworkarchitecture Potential converged architecture

IEEEHPSRConference|Budapest,2015July1-4|FMCTutorial|StructuralConvergence 44

IdenSfiedtechnologicaltriggersforstructuralconvergence

� Heterogeneousradioaccessnetworks:�  Pushstructuralconvergenceofmobile,Wi-FiandfixedaccessnetworksbecauseofasignificantlylargernumberofsmallcelllocaNonsandtherequiredcoordinaNonofsmallandmacroscells.

�  BBUhostellingandmobilefronthaultechnologies:�  ThiscentralizaNonofradioaccessfuncNonsenableconvergenceatcentralofficeswherebothfixedandmobiletrafficareaggregatedatthesameplace.

� UnifiedopNcalaccess&aggregaNonnetwork:�  AllowsstructuralconvergencewithconvergedphysicallayersupporNngheterogeneousaccessmediaandservicesforfixed,mobileandWi-Fibroadband

Technological triggers

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Heterogeneousradioaccessnetwork

Macrocell

OpNcalFixedAccess

Smallcell

Spotcell

Macrocellbackhaul Today

Massivedeploymentofnewcellsites(1000s)expectedinonlyafewyears.

Massivedeploymentofnewsmallcellsitesrequiresconceptofcommonbackhaul

Backhaul:thenetworksegmentbetweenthenetworkcontrollersiteandtheradiostaNonbasebandunits

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BBUhostellingandmobilefronthaultechnologiesMobilefronthaulandCloudRadioAccessNetworks(C-RAN)�  Fronthaul:connecNonbetweenthebasebandunitandtheremoteradiounits�  Stringentrequirementsinlinerate(mulN-Gbit/s)andlatency(150µsRoundTripTime)�  TheserequirementsshouldstronglyfosterWDM-basedaccesssystems,eitherondedicatedorsharedfibreinfrastructure

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Impactoffronthaulonnetworkdesign

�  BasebandUnit(BBU)andRemoteRadioUnit(RRU)arelocatedatcellsitelocaNon

�  BasebandsignalsareprocessedatthecellsitebyaBBUeitherlocatedatthebaseofthecelltowerorintegratedwiththeradiounit.

BBU hostelling and mobile fronthaul technologies: •  Centralisation of radio access functions enable convergence at Central Offices (COs)

where both fixed and mobile traffic are aggregated at the same place •  Opportunity to reduce the number of COs and to reduce the costs of such sites •  Requirement comes from the RAN design

RRU

RRU

RRU RRU

RRU

RRU

Backhaul Network

BBU BBU Fronthaul Network

Backhaul Network

Radio controller

Radio controller

CPRI

�  BBUsareplacedinaremotelocaNon(e.g.,CO),leavingonlytheradioparts,antennasandRRUs,atthecellsites.

�  Highdataraterequired(LTE3cells,20MHz,2x2MIMOeq.7.5Gb/s)

�  LowtransmissiondelaybetweenBBUandRRUrequiredduetoeNodeBprocessingNme(proc.+transmission:3mstotaldelay)

Mobile Backhaul

Mobile Fronthaul

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•  ConvergedphysicallayerfuncNonssupporNngheterogeneousaccessservicesforfixed,mobileandWi-Fi

•  LowRTT(<400µs)andhighcapacity(~10Gbit/s/l)•  Seamlessinteroperabilitywithfixed/mobilenetworkelements

•  Dynamicity,scalability,survivability,carrier-gradeoperaNons•  CompaNbilitywithlegacynetworksandinfrastructures

•  e.g.exisNngOpNcalDistribuNonNetworks

•  TDM/TDMAandWDMfordataplane,SDNforcontrol•  Differentflavourscouldbeconsidered,basedonNG-PON2orDWDMphotonictransporttechnologies

AunifiedopScalaccessandaggregaSonnetworkwillalsofosterstructuralconvergence

RequirementsofaunifiedopNcalaccess/aggregaNon

KeytechnologiesforaunifiedopNcalaccess/aggregaNon