PD Micro BTS A9110EWord文档下载推荐.docx

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Toanswertheongoingmarketdemandforhighercapacities,highercompactnessandbetterperformance,AlcateloffersanewMicro-BTSwithintheproductrangeofEVOLIUM™RadioSolutions.Thewideflexibilityoftheproductallowsnumerousapplicationsbyprovidingnotonlytraditionalmicro-cellscoverage,butalsominicells,andin-buildingcellschoicesinGSM850,GSM900,GSM1800andGSM1900ormultibandnetworks.

AdescriptionoftheprinciplesandcharacteristicsofthisnewAlcatelA9110-EMicroBaseStationisprovidedinthefollowing.

CONTENTS

1.

GENERAL

TheEVOLIUM™A9110-EMicroBaseStationhasbeendesignedwiththemaingoaloffacilitatingsiteacquisitionandinstallationinawidevarietyofenvironment,whileofferingcost-efficientoperationandflexibilityforfutureevolutions.

ThehighlightsoftheEVOLIUM™A9110-EMicro-BTSare:

Adaptability（tooptimizeoperator'

sinvestment）

Minimumsiteconstraints

Wall/poleandindoor/outdoorinstallation

Minimumvolumeandweight,

Hightemperatureenvironmentsupportwithoptionalfan,

Noacousticnoiseemissionthankstoconvectionalcoolingconcept.

Therightnumberofsites

DifferentTxpowerversions,

Dual-bandconcept,

Integratedorremoteantennas.

Quickandefficientroll-out

Modularmountingconcept,

Cabinetwithintegratedconnectionbox,

Remoteinventory,

Minimuminstallationtime,

Autotestduringcommissioning.

CompatibilitywithpreviousA910generation:

NewA9110-EunitcanbeusedasreplacementofaA910

SiteconfigurationscanmixolderA910andnewA9110-E

Flexibility（tominimizeoperator’soperationalexpenses）

Painlessmaintenance

One-moduleconcept（‘Plug&

Play’）,

Nopreventivemaintenance（standardconfigurations）.

Easynetworkupgrades/reconfigurations

Onlineextensionofmodules（upto12TRXs）,

Twosoftwareversionsinhotstandby.

Reducedtransmissionandenergy

75-ohmsor120-ohmstransmissionimpedance,

-36dBAbisreceiversensitivityforlonghaullines

（upto1,8Km,cabledependant）

Lowpowerconsumption.

-Highernetworkreliability

Highreliability（MTBF）,

Severalfrequencysynchronizations（freerunning,PCM）.

Futureproof（tomaximizeandensureoperator'

srevenue）

Minimumcapacityconstraints

Infieldextensionupto12TRXs,

Supportofdualband.

Allexistingservicessupported

Supportoffullrate,halfrateandenhancedfull-ratecodec,

Supportofallcipheringalgorithms,

AllGSMPhase2+features

Readyforbroadbanddataapplications（releasedependant）

-SupportofGPRSdataservices,

-SupportofEDGE.

2.

OVERALLARCHITECTURE

2.1TheEVOLIUM™A9110-EMicroBaseStationconcept

AnEVOLIUM™A9110-EMicro-BTSsiteconfigurationconsistsofuptosixA9110-Ebasicunits.Thisbasicunitisa2TRXbasisblockenablingtobuildlargerMicro-BTSsiteconfigurations,withcapacitiesfromtwouptotwelveTRXsinoneuptosixsectors.

Buildingormodifyingsiteconfigurationsisfullyflexible.Byonlyaddingbasicunits,itispossibletoadaptcapacitytonetworkdevelopmentrequirements.

Figure1:

EVOLIUM™A9110-EMicro-BTSsiteconfigurationprinciple.

Onebasicunitischosenasmasterentity.Theotherbasicunits（maximumfive）serveasslaveentitiesandareconnectedtothemasterviaamaster-slaveconnectionwhichiscomposedoftheinter-entitybusandthepowersupplycables;

thisconnectioniseitheradirectone,orthroughanintermediateslave;

slaveunitsdirectlyconnectedtothemasteraresaid"

upperslaves"

whileslavesconnectedtoanupperslavearesaid"

lowerslaves"

.Twoconnectorsareavailableoneachbasicunittowardslavesoflowerlevel.Thus,anyconfigurationcanbederivedfromthatpresentedintheabovefigurebyremovingbasicunits,startingfromlowerlevel.

Slaveormasterbasicunitsareidenticalfromahardwarepointofview;

but,allbasestationcontrolfunctionsareactivatedinthemasterunitonly.

Micro-BTSsofformergeneration（A910Micro-BTSs）canbepartofsuchaconfiguration,therulebeingthatinsuchamixedconfiguration,aA910Micro-BTScanonlybean"

UpperSlave"

andwithno"

LowerSlave"

connectedtoit.

TheA9110-Ebasicunit,whichismadeofaminimumnumberofmodules,isacompleteBTSincludingconnectionarea,mountingframe,etc..Thisconcept,allowsasimplifiedlogisticaswellasaflexibleinstallationandreconfiguration.Itfitstomostapplications.

2.2

TheA9110-Ebasicunit

TheA9110-Ebasicunithasa2-TRXcapacity.Itisbasedonathree-levelmodulararchitecture,consistingofthe

Antennacouplinglevel,

Transceiver（TRX）level,

BasestationControlFunction（BCF）level,

forwhichareducedsetofveryhighlyintegratedmoduleswasdeveloped.

Twotypesofbasicunitsareprovidedwithadifferentantennacouplingleveltoconnecteitheroneortwoantennas.TheinformationflowbetweentheAirinterfaceandtheAbisinterfaceforbothtypesarepresentedinFigure2.

Figure2:

ThetwovariantsoftheA9110-Ebasicunit

2.2.1

Antennacouplinglevel

Theantennacouplingleveliscalledantennanetwork;

itisthestagebetweentheantennasandtheTRXlevel.Thehardwareofantennacouplingmoduleisfrequencybanddependant.

Thegeneralfunctionsperformedatthislevelare:

Duplexingtransmitandreceivepathsontocommonantennas,

Feedingthereceivedsignalsfromtheantennatothereceiverfrontend,wherethesignalsareamplifiedanddistributedtothedifferentreceivers（Low-NoiseAmplifier（LNA）andpowersplitterfunctions）;

Providingfilteringforthetransmitandthereceivepaths,

Hybridcombining,ifnecessary,outputsignalsoftwotransmittersandconnectingthemtoasingleantenna.

Twodifferentantennanetworkarchitecturesareoffered:

Single-antennaarchitecturebasedonhybridcombining,

Low-lossarchitecturebasedonaircombining.

Theprincipleandmaincharacteristicsofeacharchitecturearepresentedbelow,oneofthedifferencesbeingobviouslytheoutputpowerthatisintherangeof3 

Wforthesingle-antennaversionagainst7 

Wforthelow-lossarchitecture（moreprecisevaluesaccordingtofrequencybandaregiveninsection"

RFperformances"

below）.

2.2.1.1Single-antennaarchitecture

Thesingle-antennaarchitectureallowstoconnecttwoTRXstoonesingleantenna.Itcombinestwotransmitterstooneoutputwiththehybrid-combiningmethod.Italsodistributesthereceivedsignaltotworeceivers.Antennadiversityisnotpossiblewiththissolution.

Figure3:

Single-antennaarchitecture

2.2.1.2Low-lossarchitecture

Comparedtothesingle-antennaarchitecture,the"

low-loss"

architecturecontainstwofullchainsfortransmissionandforreception,withforeachchainaduplexer,areceiverfrontend（LNA）andasplitter.

ThebasicoperationmodeistodedicatethetwochainstotwoTRXsofasamesector:

inthereceivepath,theoutputoftheLNAofeachchainisfed,throughthesplitter,toboththereceiverofthischainandthereceiveroftheotherchain,thusprovidingantennadiversity,

inthetransmitdirection,thesignalcomingfromeachTRXisfedtoitsownantennathroughaduplexer;

air-combiningisthususedinsteadofhybridcombining,resultinginalowerlossinthetransmitpath（hencethename）andanincreasedTxoutputpowercomparedtosingle-antennaarchitecture

AnalternativeoperationmodeistodedicateeachchaintoaseparateTRXofadifferentsector,providingtwosectorsofoneTRXeach.Switchingbetweenthetwomodesisobtainedonlythroughasoftwarecommand.Noadditionalhardwarechangeisnecessary.

Figure4:

Low-lossarchitectureusedfor"

Singlesectorwithantennadiversity"

Figure5:

twosectorswithoutantennadiversity"

2.2.2Transceiver（TRX）level

Thetransceiver（TRX）levelcoversGSM850,GSM900,GSM1800andGSM1900functionalities,includingfullrate,halfrate,enhancedfullrate,antennadiversity,radiofrequencyhopping（synthesizedhopping）anddifferentcipheringalgorithms.

InsideeachTRXmoduleanRFloopisimplemented.ThelooptestisperformedafterdownloadingthefrequenciestotheMicro-BTSasasupplementtotheautotest.

TheTRXmodulealsohandlestheRadioSignalingLink（RSL）protocol.

2.2.3BasestationControlFunction（BCF）level

ThislevelisrealizedbytheMicro-BTSStationUnitModule（MSUMA）.Thismoduleisphysicallypresentineachbasicunit,masterorslave