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cnIPTN:IPBearerNetworkSolutionOrientedto2G/3GMobileBackhaulAsthecompetitionintheglobaltelecommarketbecomesincreasinglyfierce,the2Gand3Gbearerservicescoexist,thetrafficbandwidthincreasesconstantlyandtheinterfacestendtobeIP-based,thebearernetworksarerequiredtoprovidepowerfulmulti-servicebearercapability,statisticalmultiplexing,differentiatedQoS,carrier-classserviceguarantee,high-precisionclocksynchronization,andexcellentnetworkextensibility.
Multi-servicebearerThe3GBTStendstoprovideFEinterfaces,andthe2GBTStendstobeIP-based.
ThisrequiresthebearernetworktobearEthernet,TDMandATMservicesinaunifiedmanner.
StatisticalmultiplexinganddifferentiatedQoSGenerally,thebandwidthofa2GBTSis1to2*E1,whichprimarilycarriestraditionalvoicetraffic.
Attheearlystageof3G,thebandwidthofa3GBTSisabout10to20Mbps.
WhenHSxPAservicesaredeployedonalargescale,thebandwidthofthe3GBTSwillincreaseto40-50Mbps.
TheIPservicesincludingreal-timeandnon-real-timeservicesareinalargeproportion,andtheirQoSrequirementsvarysignificantly.
ThisrequiresthebearernetworktoprovideefficientstatisticmultiplexinganddifferentiatedQoSwhileofferinglargerbearercapacity.
Carrier-classOAM&PNomatterwhattechnologyisusedtoconstruct2G/3Gmobilebackhaulnetworks,itisnecessarytosatisfythecarrier-classbearerrequirementsincludingcarrier-classprotectionswitchinginlessthan50ms,end-to-endserviceprovisioning,andcarrier-classOAMcapability.
WhentheoperatorshavingconventionalMSTP-basedbearernetworksadoptthepackettechnologytoconstructtheir2G/3Gbearernetworks,theyneedtoleveragetheirmatureexperienceinMSTPnetworksintermsofnetworking,managementandfaultdiagnosis,soastoreducetheimpactonnetworkoperationandmaintenance.
High-precisionclocksynchronizationTheTDD-based3Gmobilesystems(suchasCDMA2000,TD-SCDMAandWiMAX)requireclocksynchronization.
TheBTSclocksynchronizationcanbeimplementedthroughtheGPStechnique,butitisdifficulttoinstallantennasandfeedersanditisnecessarytobackupthegroundclocksynchronization.
Therefore,mostoperatorsrequirethe3GbearernetworktoprovideexcellentclocksynchronizationthatcanenhancereliabilityoftheGPSclocksynchronization.
ExcellentnetworkextensibilityThefast,wideanddeepcoverageof3Gnetworkscangreatlyenhancetheoperators'competitiveedge,sotheirbearernetworksshouldbehighlyextensibletosupportfastnetworkdeploymentandsmoothevolutionfrom2G/3GtoLTE.
LowTCOOperatorsalwaysexpectalowTCOfortheirnetworkconstruction.
TheIPbearernetworksolutionorientedto2G/3GmobilebackhaulshouldreduceboththeCAPEXandOPEX.
MarketDemandAnalysiswww.
zte.
com.
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zte.
com.
cnFigure1NetworkingofIPTNsolutionZTEhasalwaysbeencommittedtotheR&DofadvancedbearertechnologiesandIP-basedmobilebackhaulapplications.
Basedontheconceptsofgloballeadingoperatorsonradiobearernetworkconstruction,ZTEhaslauncheditsIPTN,theIPbearersolutionorientedto2G/3Gmobilebackhaul.
ZTE'sIPTNsolutionadoptingtheopenandunifiedpacketswitchingplatformprovidesefficientbearerfordeliveryof2G/3Gpacketservices,TDM/ATMservicesaswellasIP-basednewservicesinthefuture.
TheTDME1,IMAE1andFEservicessentfromtheBTScanbeconnecteddirectlyorthroughmicrowaveandPONequipmenttoIPTN(seeFigure1).
ZTE'sIPTNsolutionhasthefollowingfeatures:OpenserviceplatformItadoptsthePseudoWireEmulationEdge-to-Edge(PWE3)technologytotransportvarioustrafficoverTDM,ATM,EthernetandIPnetworksandsupportmultipleserviceinterfacessuchasFE,GE,10GE,STM-N(CH,POS,ATM),TDME1andIMAE1,fullymeetingthebearerrequirementsof2G/3Gmobilebackhaulservices.
FortheTDME1andATMIMAE1servicessentfromtheBTS,theIPTNcoreconvergenceequipmentconnectswiththeRNC/BSCviaE1orch.
STM;fortheFEservicessentfromtheBTS,theIPTNcoreconvergenceequipmentconnectswiththeRNC/BSCviaGE,FEor10GE.
EfficientstatisticalmultiplexingandDiff-ServbasedQoSByusingtheunifiedpacketcoreandintegratingtheprotectionandOAMfeaturesoftraditionalTDMtransportequipment,itprovidesefficientbearercapability,includingstatisticalmultiplexing,structuredTDMtimeslotcompression,andidleATMcelldrop.
ItsupportsDiff-ServQoSmodelandprovidesdifferentiatedservicethatmeetstheServiceLevelAgreement(SLA)requirementsthroughserviceclassification,trafficconditioning,trafficpolicing,queuescheduling,andtrafficshaping.
Carrier-classserviceguaranteeItprovidescarrier-classprotectionmechanisms.
Attheequipmentlevel,itprovides1+1hotbackupforkeyboardssuchascross-connectionboard,clockboard,maincontrolboardandpowerboard,withacarrier-classreliabilityof99.
999%;atthenetworklevel,itprovidesend-to-endprotectionmechanism:LinkAggregationGroup(LAG)protectionandInverseMultiplexingforATM(IMA)protectionattheUser-NetworkInterface(UNI)sideand1+1/1:1protection,SNC1+1/1:1protectionandMPLS-TPringnetworkprotectionattheNetwork-to-NetworkInterface(NNI)side,thusensuringacarrier-classprotectionswitchinginlessthan50ms.
ZTE'sIPTNSolutionZTEPlaza,KejiRoadSouth,Hi-techIndustrialPark,NanshanDistrict,Shenzhen,P.
R.
ChinaPostcode:518057Website:www.
zte.
com.
cnTel:86-755-26770000Fax:86-755-26771999S.
N.
:xczl200SDH-likeOAMItprovidesSDH-likeOAMfeatures.
Withthehardware-basedOAMsupport,itimplementscarrier-classfunctionssuchasautodiagnosisofnetworkfaults,protectionswitching,performancemonitoring,faultlocating,etc.
ItcomplieswiththeITU-TG.
8114,Y.
1731andIEEE802.
3ahstandardsandprovidesend-to-endOAMondemandandmanagement,therebyenhancingthecarrier-classfeaturesofthepacketnetwork.
Moreover,itusesZTE'sunifiedNetNumenplatformtoimplementcentralizedmanagementofallIPTNdevicesandconventionaltransportdevices.
High-precisionclocksynchronizationZTEisthefirstintheindustrytoadopttheIEEE1588PrecisionTimeProtocol(PTP)foritsclocksynchronizationsolutionbasedontheG.
8261standardforsynchronousEthernet.
Thesolutiongreatlyimprovestheprecisionofclocksynchronization,andeffectivelyreducesthepacketsendingfrequencyandtheconvergenceduration,therebymeetingthefrequencyandclocksynchronizationrequirementsofBTSsindifferentmodes.
GoodnetworkextensibilityItprovidesgoodnetworkextensibility.
Attheearlystageof3G,theIPTNsolutionadoptsthehierarchicalnetworkingthatconsistsoftheaccesslayerandtheconvergencelayer.
ThenetworkingbandwidthoftheaccesslayerisGEandthatoftheconvergencelayeris10GE.
Whenthe3GbecomesmatureorevolvestoLTE,theIPTNsolutionwillevolvetotheMesh-basednetworking.
Duringtheevolution,theIPTNhasgoodadaptabilitytotheadditionofnetworkdevicesandupgradeoflinkandequipmentcapacity.
ConclusionTocatertotheoperator'srequirementsonservices,investmentprotection,networkevolution,networkreliability,andenvironmentalprotection,ZTE'sIPTNsolutionisdesignedtosupporttheconstantbandwidthgrowthofmobileBTSswhilereducingCAPEXandOPEX.
ItcanbearIPservicesofmobileBTSsaswellasthetraditionalservicesinanefficient,flexibleandreliablemanner,supportingsmoothevolutiontoreducetheoperator'sriskoftechnologyselection.
TheIPTNsolutionhasbeenhighlyrecognizedbyoperatorsandhasbeencommerciallydeployedinsomeareas.
Asmoreandmore3Gnetworksaredeployedandthe2G/3GBTSsareIP-based,theIPTNsolutionwillbewidelyusedintheIPbearernetworksfor2G/3Gmobilebackhaul.