UAC统一接入控制.docx

UnifiedAccessControl（通用接入控制）上周将NR重选的时候，在SIB2中定义了UAC当时由于时间问题，没有展开来进行解释，所以考虑补充一个专题文档UAC是UE接入控制或状态改变的机制集合在LTE中，我们就经常会碰到需要接入控制的时候，比如某个小区超载了，大量UE接入到一个小区，导致UE间相互干扰严重，无法成功解码在4G中，接入控制主要有两种类型：UE初始接入请求的时候，网络下发拒绝消息；自己阻止UE尝试初始接入（也就是CellBar）Case1:SIB1配置bar，所有UE都不能接入，含紧急呼叫Case2:SIB2配备Bar，只针对特定服务特定的UE禁止接入在LTE中，接入控制主要在RRC层进行，但是，在NR中，不仅在RRC层进行控制，还可以在NAS层进行控制具体如下：UACAlgorithmUSIMFactorsDescriptionRRC?uac-BarringlnfoinSIB1?RRCState(Idle,Connected,Inactive)NAS?见下文USIM?EFUACAIC,EFACCUAC触发根据24.5014.5.1总结如下：TriggerDescriptionNAS状态改变服务请求(in5GMM-C0NNECTED)5GMM-IDLE-->5GMM-C0NNECTEDMO-MMTEL-voice-call-startedindicationMO-MMTEL-video-call-startedindicationMO-SMSolP-attempt-startedMOSMSoverNASULNASTRANSPORTmessageforPDUsessionestablishment(exceptforthepurposeofIDLE->CONNECTEDNASStatechange)ULNASTRANSPORTmessageforPDUsessionmodification(exceptforthepurposeofIDLE->CONNECTEDNASStatechange)Requesttore-establishtheuser-planeresourcesforanexistingPDUsessionNotificationforanuplinkuserdatapackettobesentforaPDUsessionwithsuspendeduser-planeresourcesSIM卡信息相关的UACEFAcc(AccessControlClass)Byte1:EFUAC_AIC(UACAccessIdentitiesConfiguration),31.102定义如下:b1=0:UEisnotconfiguredforMultimediaPriorityServiceintheHPLMN,EHPLMNoravisitedPLMNofthehomecountry.b1=1:UEisconfiguredforMultimediaPriorityServiceintheHPLMN,EHPLMNoravisitedPLMNofthehomecountry.b2=0:UEisnotconfiguredforMissionCriticalServicesintheHPLMN,EHPLMNoravisitedPLMNofthehomecountry.b2=1:UEisconfiguredforMissionCriticalServicesintheHPLMN,EHPLMNoravisitedPLMNofthehomecountry.RFUb8b7b6b5b4b3b2b11514131211100908NumberoftheACC(exceptforbitb3)Byte2:b8b7b6b5b4b3b2bl~F~F1~nnr~Fn-I-0706050403020100Identifier:'6F78'Structure:transparentMandatorySFI:'06'Filesize:2bytesUpdateactivity:lowAccessConditions:READPINUPDATEADMDEACTIVATEADMACTIVATEADMBytesDescriptionM/OLength1to2AccesscontrolclassesM2bytesNumberoftheACC如何获取接入标识符?AccessidentitiesAccessIdentitynumberUEconfiguration0UEisnotconfiguredwithanyparametersfromthistable1(NOTE1)UEisconfiguredformultimediapriorityservice(MPS).2(NOTE2)UEisconfiguredformissioncriticalservice(MCS).3-10Reservedforfutureuse11(NOTE3)AccessClass11isconfiguredintheUE.12(NOTE3)AccessClass12isconfiguredintheUE.13(NOTE3)AccessClass13isconfiguredintheUE.14(NOTE3)AccessClass14isconfiguredintheUE.15(NOTE3)AccessClass15isconfiguredintheUE.NOTE1:Accessidentity1isvalidwhen:-theUSIMfileEFuac_aicindicatestheUEisconfiguredforaccessidentity1andtheselectedPLMN,ifanewPLMNisselected,orRPLMNistheHPLMN(iftheEHPLMNlistisnotpresentorisempty)orEHPLMN(iftheEHPLMNlistispresent),oravisitedPLMNofthehomecountry(seethedefinitionofhomecountryin3GPPTS24.301[15]);or-theUEreceivesthe5GSnetworkfeaturesupportIEwiththeMPSindicatorbitsetto"Accessidentity1valid"fromtheRPLMNasdescribedinsubclause5.5.1.2.4andsubclause5.5.1.3.4.NOTE2:Accessidentity2isusedbyUEsconfiguredforMCSandisvalidwhen:-theUSIMfileEFuac_aicindicatestheUEisconfiguredforaccessidentity2andtheselectedPLMN,ifanewPLMNisselected,orRPLMNistheHPLMN(iftheEHPLMNlistisnotpresentorisempty)orEHPLMN(iftheEHPLMNlistispresent),oravisitedPLMNofthehomecountry(see3GPPTS23.122[5]);or-theUEreceivesthe5GSnetworkfeaturesupportIEwiththeMCSindicatorbitsetto"Accessidentity2valid"fromtheRPLMNasdescribedinsubclause5.5.1.2.4andsubclause5.5.1.3.4.NOTE3:Accessidentities11and15arevalidinHPLMN(iftheEHPLMNlistisnotpresentorisempty)orEHPLMN(iftheEHPLMNlistispresent).AccessIdentities12,13and14arevalidinHPLMNandvisitedPLMNsofhomecountryonly(seethedefinitionofhomecountryin3GPPTS24.301[15]).那么，接入等级能够提供哪些服务呢？MappingtableforaccesscategoriesRule#TypeofaccessattemptRequirementstobemetAccessCategory1ResponsetopagingorNOTIFICATIONovernon-3GPPaccess;5GMMconnectionmanagementprocedureinitiatedforthepurposeoftransportinganLPPmessagewithoutanongoing5GC-M0-LRprocedure;AccessattempttohandoverofongoingMMTELvoicecall,MMTELvideocallorSMSoIPfromnon-3GPPaccessAccessattemptisforMTaccess,orhandoverofongoingMMTELvoicecall,MMTELvideocallorSMSoIPfromnon-3GPPaccess0(=MT_acc)2EmergencyUEisattemptingaccessforanemergencysession(NOTE1,NOTE2)2(=emergency)3Accessattemptforoperator-definedaccesscategoryUEstoresoperator-definedaccesscategorydefinitionsvalidinthecurrentPLMNasspecifiedinsubclause4.5.3,andaccessattemptismatchingcriteriaofanoperator-definedaccesscategorydefinition32-63(=basedonoperatorclassification)3.1AccessattemptforMOexceptiondataUEisinNB-N1modeandallowedtouseexceptiondatareporting(seetheExceptionDataReportingAllowedleafoftheNASconfigurationMOin3GPPTS24.368[17]ortheUSIMfileEFnasconfigin3GPPTS31.102[22]),andaccessattemptisforMOdataorforMOsignallinginitiateduponreceivingarequestfromupperlayerstotransmituserdatarelatedtoanexceptionalevent.10(=MOexceptiondata)4Accessattemptfo。