36872-c00 Small cell enhancements for E-UTRA and E

3GPPTR36.872V12.0.0(2013-09)TechnicalReport3rdGenerationPartnershipProject;TechnicalSpecificationGroupRadioAccessNetwork;SmallcellenhancementsforE-UTRAandE-UTRAN-Physicallayeraspects(Release12)Thepresentdocumenthasbeendevelopedwithinthe3rdGenerationPartnershipProject(3GPPTM)andmaybefurtherelaboratedforthepurposesof3GPP.Thepresentdocumenthasnotbeensubjecttoanyapprovalprocessbythe3GPPOrganizationalPartnersandshallnotbeimplemented.ThisSpecificationisprovidedforfuturedevelopmentworkwithin3GPPonly.TheOrganizationalPartnersacceptnoliabilityforanyuseofthisSpecification.Specificationsandreportsforimplementationofthe3GPPTMsystemshouldbeobtainedviathe3GPPOrganizationalPartners'PublicationsOffices.3GPP3GPPTR36.872V12.0.0(2013-09)2Release12KeywordsLTE,radio,smallcell,physicallayer3GPPPostaladdress3GPPsupportofficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:[phone]Fax:[phone]Internet©2013,3GPPOrganizationalPartners(ARIB,ATIS,CCSA,ETSI,TTA,TTC).Allrightsreserved.UMTS™isaTradeMarkofETSIregisteredforthebenefitofitsmembers3GPP™isaTradeMarkofETSIregisteredforthebenefitofitsMembersandofthe3GPPOrganizationalPartnersLTE™isaTradeMarkofETSIregisteredforthebenefitofitsMembersandofthe3GPPOrganizationalPartnersGSM®andtheGSMlogoareregisteredandownedbytheGSMAssociation3GPP3GPPTR36.872V12.0.0(2013-09)3Release12ContentsForeword.............................................................................................................................................................5Introduction........................................................................................................................................................51Scope........................................................................................................................................................62References................................................................................................................................................63Definitionsandabbreviations...................................................................................................................73.1Definitions.........................................................................................................................................................73.2Abbreviations.....................................................................................................................................................75Smallcellscenariosforevaluation...........................................................................................................85.1Scenario#1........................................................................................................................................................95.2Scenario#2a.....................................................................................................................................................105.3Scenario#2b....................................................................................................................................................115.4Scenario#3......................................................................................................................................................126Potentialenhancementstoimprovespectrumefficiency.......................................................................136.1Introductionofahigherordermodulationschemeforthedownlink...............................................................136.2EnhancementsandoverheadreductionforUE-specificreferencesignalsandcontrolsignalling...................176.2.1OverheadreductionofdownlinkUE-specificreferencesignal..................................................................176.2.2OverheadreductionofuplinkUE-specificreferencesignal.......................................................................196.2.3Enhancementsofcontrolsignalling...........................................................................................................216.2.3.1Multi-subframeschedulingandcross-subframescheduling.................................................................216.2.3.2TransmissionofPDSCH/ePDCCHinOFDMsymbol#0....................................................................217Mechanismstoensureefficientoperationofasmallcelllayer.............................................................227.1Mechanismsforinterferenceavoidanceandcoordinationamongsmallcells.................................................227.1.1Smallcellon/off.........................................................................................................................................227.1.1.1Smallcellon/offschemesandperformancegains................................................................................227.1.1.1.1Semi-staticsmallcellon/offschemesandperfor