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Supportgrowsforexpansionof SONs t ocover3GnetworksAccordingt o a majorvendor, thedevelopment of self-organizingnetworks t o supporttherolloutof LTEprovidesanopportunityt o automatenetworkprocessesforexisting3Gnetworks , helpingoperatorsmaintaintheiropexfornetworkoperationsandmaintenance

at currentlevels . Notallequipmentproviderssaythiswillbeeasy t o achieve ,however.

Networkoperationandmaintenancecanbedramaticallysimplified if thekind ofautomated configurationandoptimizationcapabilitiesplannedforLTEnetworkscanbeappliedretrospectively to 3G , Ericssonsays .Thevendorsays it wants to makesurethatthestandardsfor

self-organizingnetworks ( SONs ) , whicharebeingdevelopedbytheNGMNandstandardizedin

3GPP,

arebackward-compatiblewithHSPAnetworks.

Networkshavebecometoocomplicated , andnetworkoperationandmaintenancelacksclearspecificationsand is tooproprietary , UlfEwaldsson , Ericsson' s vicepresidentandheadof radioproducts , saidat theLTEWorldSummit in Berlin , heldbyInformaTelecoms& Media.WorkonSONstandardizationandLTE is set t o resolvethis

,

butSONcapabilitiesshouldbeextended t o 3G , hesaid.

Theproposal is likely to bewelcomedbymobileoperatorsthatwant to maintaintheirnetworkcostsbyreusingcellsitesandassociatedequipment , suchasantennasystems , asmuchaspossiblefortherollout of LTE . Applying SONfeaturesretrospectivelyto 3Gnetworkscouldhelpthemdoso.

"

Wedon' twantt o repeatthestorythatwehadwith3G , wherewedeployed a completelynewnetworkoverlay,

"

Klaus-JurgenKrath , executivevicepresidentof radio-network

engineeringandqualityat T-Mobile , tolddelegates in Berlin ."

I t has to beverysmoothand toutilizewhatwehaveas

operatorassets . There

maybesome

optimizationmeasures

thatcan

bedonesothatyoucanoptimizeLTEand3G in a more-or-lesscommonway."

Hans-ErikKarsten,

vicepresident of network technologiesforTelenorR&I , saidtheoperatorwaseager to exploretheways in whichSONscouldhelp it bemuchmoreflexibleand

dynamic in how it organizes itsnetworks ."

I t's

easierto put in a basestation in themiddle of

yournetworkwithouthaving t o replanthewholeuse of yourfrequencies ," hesaid.

Mostoperatorshaveat leasttwolayers of technology, 2Gand3G , saysChrisLarmour , chief

marketingofficer of network-performancecompanyActix ."

If theyaddonanotherone ,they' re going to increase theiropexbybetween3opercentand5opercent , dependingonhowwelltheymanage t o reducetheirheadcountandothercosts in theirlegacynetworks ,

"

hesaid . " Whattheywant t o do is actuallykeepcostsflat , or evenbetterreducethem . Theonlywayt o dothat is to automate thingsandmakethemmoresystematic.

"

Actixis alreadycollaboratingwith a European tier i mobileoperatorgroupin research into

and

developmentof

SONsforHSPAand4G

networks . Thetwocompanies

arefocusing

onautomatingnetwork-statusmanagementdiagnostics andprovidingcentralizedSONsystemscapable of deliveringself-optimization capabilitiesfor3Gand4Gnetworks.

According t o Larmour , 8o-go%% of thefunctionalityrequiredfora self-organizingnetworkis common to 3G , 3.5Gand4G .

"

Theprocessesthatarebuilt in , suchasthediagnosticcapability

andtheabilityto sendcommandsoutt o thenetwork in a controlledfashion , areallverysimilaramongstthetechnologies ,

" hesaid.Theparalleloperation of multipletechnologies suchas2G , 3GandLTE is a keyreasonfor

implementingSONs , saysPeterDent , a member of technicalstaff at TexasInstruments . Thefeaturesof SONsthatenable a basestation to self-configurebylisteningt o otherbasestationscouldbeavailable in twoor threeyears , thoughsome of themoreadvanced

interference-management andcapacity-optimizationfeatures of SONsmightbeupto io yearsaway,Dentsays ( seefig . 1 ) .

Accordingt o Larmour

,

all of theleadingnetwork-equipmentproviders

havealreadydemonstratedself-configuringfunctionalitywithintheeNodeBenvironment , andhesays it

will " definitelybedelivered"

aspart of theearly-stagedeployment of LTE ."

Therearecertain

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Fig . 1 : SON frameworkforeNodeB

Self-configuration( preoperationalstate )

Self-optimization(operationalstate )

Self-healing( operational state )

Source : TexasInstruments

eNodeBpoweron

Basicsetup

Initialradio

configuration

Optimization

Selfhealing

Configuration of IP address

Associationwitha GW

Authentication

Softwareandconfigurationdata

Neighborlistconfiguration

Coverageparametersconfiguration

Others( physical cellidentityconfiguration )

Neighborlistoptimization

Capacityandcoverage optimization

Others( energysavings , interference

reduction , mobilityoptimizations )

Failuredetectionandlocalization

Healingprograms

Others

tasksthatlendthemselvesverywellto beingdonelocally in theeNodeB , andtheseare

typicallytheself-configurationusecaseswhereyouhave a plug-and-playbasestation , like a

femtocell,

or even a fullbasestation,

"

hesays.Thetwootherkeyareas of self-organizingnetworks self-optimizationandself-healing

arenoteasilyimplemented in thebasestation , becausetheeNodeBdoesn' thave a view oftheentirenetwork

,

whichis whyActix is proposinga centralizedSON t o carryoutthesefunctions

,

Larmoursays."

Thathas to bedonebysomethingthathasa higherview of many , manymoresiteswithina specificarea , particularlyin a casewhereyou' vegotmultipleeNodeBvendors in thenetwork

,

whichis verycommon ,

"

hesays.PaulSteinberg , chiefarchitectforwirelessinfrastructure at Motorola , sayshe is not

convinced that it willbepossiblet o makeSONsbackward-compatible , however .According t oSteinberg, thecapabilities of theSONareintrinsict o thedesign of LTEequipmentandnetworkarchitecture . In addition

,

mobilehandsetsanduserequipmentwillneedt o have arole in theorganizationof thenetworkandsome of thesharing of neighborlists , sothedegree to whichthiscanbeappliedto 3Gnetworkswillbelimited , hesaid.

Motorola,

whichannounced thelaunch of itsLTESON in Berlin,

hasanalyzed150operatorusecasesandcategorized themin terms of frequencyandcost , Steinbergsaid .

"

Whatwe'vedone is prioritizeourfeatureroadmap to tryt o address thosemore-costly , more-frequentusecasesupfront , andespeciallythosethatareassociatedwithdeploymentandinitialoptimizationof thenetwork

,

"

hesaid ."

Soasthenetworkmatures,

we'll seeotherusecasescome

on in laterphases of theroadmap."

MostcommentatorsagreethatSONstandardsarestillimmature . MarcFossier , formergroupCTO of FranceTelecom / OrangeGroup , tolddelegates in BerlinthatSONscouldsave

opexbutthatmorestandardizationwasneeded .The3GPPRelease 8 specifications included

supportforonly a fewSONfeatures , andtherearemanyproprietaryimplementationsinvendors'products , Fossiersaid .

"

Release9

willincludea

lotmoreSONfeatures. "

LarmoursaysthattheNGMNis doing a lot t o definetheoperatorusecasesandthatthose

usecaseshavefilteredthroughintothe3GPPspecifications,

particularlyTechnicalSpecification 36.902 , which is themostimportantwithregard to SONs ( seefig . 2 ) . Thespeci

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Fig . 2 : SONusecases in TS36.902

311171Z11

Interference reduction

Coverageandcapacityoptimization

Energysavings

Intercellinterferencecoordination

(

ICIC)

Mobility robustnessMobilityoptimizationoptimizations

Mobility loadbalancing

Automaticconfigurationof physicalcellidentity

Mobility loadbalancing

RACHoptimization

Category

Interference

managementandcapacityoptimization

eNBIDconfigurationandoptimization

RACHoptimization

Note : RACH= randomaccesschannelSource : TexasInstruments

Description

Optimizenetworkresources to minimizeintercellinterference

Replacedrivetestsandmanualexercises

Reduceenergycostsoperatoropex / reduceinterference

Intelligent schedulingonphysicalresourceblocksbasedonneighborcellindications

Choosethepreferredneighbors + choice or parametersforcellreselection / handover

Chooseneighborsforcellreselection / handoverto balanceeNBload

Configure thephysicalcellidentity of a basestation

Configuration : Initializeneighbor listOptimization : Dynamicprune / selectneighbors in neighbor list

ControlRACHconfigurationparameters(

numberof

preambles,

rampuppowerallocationandnumber of attempts ) > RACHsuccess rate / delay

ficationsarebecomingmoreexplicitwithregard t o basestations , andthisworkwillbetakenfurtherin Release

9

,

hesays."

There' s a preparatorystageforSONin Release 8 , butRelease9 willbethebigstepforSON

,

" hesays.EwaldssonalsosaysSONswillbelaunched

"

in parts" andthatthemaininitialobjectiveof

thestandardswillbet o simplifytheprocess of commissioning a basestation ."

Forinstance,

thereareclearrequirementsonhowlongit

willtakeandhowmucheffortwillhavet o

beputin fromanoperatorpointof view in terms of getting it startedandsoforth ,

" hesaid . " Wewillneedall of thosestandardswhenwecomeoutwithourequipment.

"

"

Forthefirsttimeyou'vegotbasestationsactuallycommunicating withoneanother , butthere' smoreworkrequiredanda differentlevel of interoperabilitytestingrequired ,

"

Steinbergsaid.

Krathsaidthatstartingwithearlydeployments of LTE , T-Mobilehopest o benefitfromwhathasalreadybeenstudiedandimplementedwithregard t o plug-and-play onself-configuration-type basestations .

"

But I thinkthatthiswouldnotbetheend,

" hesaid ."

Weexpectalotfurther in thiswholelifetime of equipmentforoptimizationandforself-healing , andthatwewillhavemuchmoreautomizationbuiltintothenetworkcomponents.

"

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