4G(LTE)终端注册信令解析.docx

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1、4G(1TE)终端注册信令解析4G系统中终端(UE)开机接入首先要在位置区(TAC)注册才能接受网络服务；之后终端周期性或按事件进行位置区更新(TAU)；一、附着与注册终端(UE)通过附着(AttaCh)启动在核心网注册流程，而TAU(跟踪区域更新)是由终端(UE)根据计时器T3412或异网返回后启动；发起附着(AttaCh)时，UE将其位置(TAC+CE11)信息注册到网络并根据其业务状态可在处于ECM-ID1E或ECM-CONNECT状态。终端(UE)通常使用1AI和ECGI来表示其位置，期间可能会请求EPS服务和非EPS服务的组合附着。在这种情况下EPS将需要与传统网络进行互操作，其间的

2、失败将导致重启跟踪区域更新过程；下图(1)显示了UE注册(上)和更新其跟踪区域(下)的正常流程。图1初始连接注册和跟踪区域更新流程二、终端(UE)附着(AttadI)消息1RRC连接完成后，UE过向MME发送AttachRequest连接到1TE网络。传递附着请求的S1APInitia1UEMessage中包含TAI和ECG1通知网络其位置。MME收至IJAttachRequest后与UE进行1TE和Security认证。，Streamcontro1TransmissionProtoco1,SrcPort:si-contro1(36412),DstS1App1icationprotoco1S1

3、AP-Ptxj:InItIatingMessage(O)臼In1t1aTIngMeSSageprocedurecode:id-Initia1UEMessage(12)critica1ity:ignore(1)Bva1ue二initia1UEMessageprotoco1IES：5itemsGItem0:1d-eNB-uE-S1AP-iD二八强IiM-NAbFNI-Item2:idTA1HProtoco1ic-F1e1did:1d-TAI(67)critica1ity:reject(0)Sva1ue3TAIp1MNIdentity:048547Mobi1ecountrycode(MCC):Mob

4、i1eNetworkCode(MNC):tICI-Item3：id-EUTRAN-CGI-Protocoi1E-Fie1d1d:Id-EUTRAN-CGI(100)critica1ity:ignore(1)ava1ueaEutran-CgiP1MNidentIty:Mobi1ecountrycode(MCC):MobiIeNetworkcode(MNC):ce11-ID：OOab2230bit1ength28.41SBpadbits,0000(EItem4:id-RRC-Estab1ishment-Cause图2.S1APInitia1UEMessage消息图2消息中UE请求联合附着，其附着类

5、型设置为“EPS/IMSI联合附着”-UE在EPS和非EPS附着。语音域偏好和UE使用已设置为“首选IMSPS语音，次要CS语音”。因此，当发起(或接收语音服务时)UE可能能够尝试Vo1TE;如VO1TE不可用将执行CSFB流程。*on-Ates-stratu2S)PDUOOOO.Securityheadertype:PIa1nna)cagc,notsecurityprotected(0).O1i1-Protoco1discrIninatcxa:fPSInobIIItyCanageentCCSMe(0x07),usEPSMobiIirynanao*f*ntMefWType：Arrachreju

6、stf4i)Oypcofccuritycontext八的(1义)：NativeccurtyCoO1CXR(foruiwnc).111.-aHty1IAHCgecontainerMXFarreter MSMetworkCapabi1ityrwsxn Mobi1r?rationr1azcArY7*MobtIestationc!t(s):OII*二1.。;：10二7”;二；3二二小：IMSf；VXK竺 nrworkfrrurr;1PCOrf图3.EPS/IMSI联合附着消息2-3MME通过发送包含拜访的P1MN标识符(即MCC和MNC)的更新位置请求来将UE的位置更新到HSSo4-7MME通过发送创

7、建会话请求与SGW/PGW创建GTP-C会话，PGW向PCRF触发信用控制请求(CCR)。创建会话请求包含用于P1MN1D服务网络IE和用于TA1和ECGI的用户位置信息IE。CCR包含3GPP-User-1ocation-InfoAVP以适应TA1和ECGI08在收到来自SGW/PGW的CreateSessionReSPonSe后，MME向UE响应AttaChACCept。附加请求包含跟踪区域列表(TA1),它是网络隐式注册UE的TA1列表。此后当UE在给定TA1内移动时，UE不需要更新其位置。Non-Access-Stratuf1i(NAS)POU0010.Securityheaderty

8、pe:Integrityprotectedandciphered(2).O111Protoco1d1scr11nator:EPSmobi1itymanageentmessages(0x07)Messageauthenticationcode:0x446cf3Sequencenumber:2OOOO.Secur1tyheadertype:P1ainhasMessage,notsecurityprotected(O).O111=Protoco1discriinator:EPSmobi1itymanagewentmessages(0x07)hasEPSMObi1ItyManagementMessag

9、eType:Attachaccept(0x42)OOOO.spareha1foctet:O.O.=Sparebt(s):0x；GPRSTimer-T3412Va1Ue:TraCkIngareaIdenEy1ist-YA1I1SrItE94messagecontainer+EPSmo(11eidentity-GUT1:EMMcauseE1ementID:OxS3cause:NerwOrkfai1ure(17)+GPRSTimer-T3423va1ueP1MN1ist-Equiva1entP1MNS-7P1MNSSEPSnetworkfeaturesupportE1ementid：0xG41eng

10、th:1OOSparebit(s):0x.1-ESRPS：networksupportsuseofextewedservicerequesttoreqes.0O.CS-1CS:noinformationaboutsupportof1ocationservicesviaCS1.=Epc-1cs：1ocationservicesviaEPCsupported1.-EMCBS:emergencybearerservicesSnS1mode.upprt;WdfI=IMSVOPS：IMSVOiCeOVerPSsessionInSI玄醛迦运学叫图3.UEAttaCh完成消息在图3中联合附着已完成其附加结果

11、设置为“仅EPS”并支持S1模式下的IMSVoiceoverPS会话。“仅EPS”表示EPS服务已成功但非EPS附着失败。9-11UE与eNB建立E-RAB,并向MME发送ACCePtCOmPIete。MME通过发送ModifyEPSbearerrequest请求SGW/PGW建立S1承载。12-13UE可以按照TS23.401中定义的标准发送TAU请求来触发TAU过程。TAU包含UE当前的TA1和ECGI。语音域首选项已设置为“IMSPS语音优先，CS语音次要，指示VO1TE优先；如不可用，UE将执行CS回退。EPS更新类型己设置为“组合TA/1A更新与IMS1附着，指示UE在附着EPS服务

12、时想要执行非EPS服务的附着。如UE具有上次访问的跟踪区域的有效TA1则包括上次访问的TAI,并且MME使用该TA1来为UE制作良好的TAI（即TA1）列表。TA1包含在TAUACCePt中。Non-Access-Sirdtum(MAS)H)UOOO1.-Securityheadertype:Integrityprotected(1).OSiiProtoco1ditcriRnator:FPS000,IIryn&nagnnenttaessage%(ox7)Messaaeauthenticationcode:0xdcr:GOOOO.Secunryheaderye:P1ain3；mezag，.nor

13、Pfuriryprotected(O).O111-Protoco1d1scrIntnator:1fsot11tymanagement*cs%qc(0x07)NASEPSMobi1ityManagementMessageType:Trackingareaupdaterequest(0x48)Oypeofruritycontextf1ag(sr.)：Hnrivrsecuritycontext(forKSIaq).101.-HAbKeyetdentfer：(S)3t.ActiveFIMQ：NobrrrCctqb1izhrrbntrEurotdQio=fpupdatetypeva1ue:cornpin

14、edtup11tv2Track1nqara*cr,ry-1a”Vr“ireredTA1iDRXHdrdBCtcr7PIbrarrrcontext-tatu%!)msnetworkcapabi1ity!TMSJ5t4tUi.,Mobi1estationCIaSUSarIt2vo-1stationc1a%rwr-wxtedcodec1ist5uptr1edcodecs，voicedcanpreferenceanduc,sUSageserinqE1ementXD：OXSd1ength:1OOOOO.-sprrtrtt(s):Oo.-ue,sus4oemg:voicecentric,.11-voicedMinpreferenceforEUTAcmiiPSVOSCCPrCrred.CSVoicerccondrHeGri