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1、DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.NAS过程过程简介简介DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.NAS过程定义定义用于UE各MME间移动性管理与会话管理过程EMM(EPS Mobility Management)协议定义了UE的移动性控制过程 ESM(EPS Session Management )定义了EPS承载上下文的管制过程,与接入层提供的承载控制协同来完成用户面的控制DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.SAE架构DA
2、TANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.SAE控制面接口UE - MME (NAS接口)NAS: 支持移动性管理功能以及用户面承载的激活、修改与去激活,并负责NAS信令的加密和完整性保护. LTE-Uu: UE 和 eNodeB间的空口协议 ,参见TS36.300 DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.基本概念(1)Aggregate Maximum Bit Rate一个UE的一组非GBR承载集合的聚合比特率的最大值EMM contextUE的Attach过程成功结束后, EMM上下文在U
3、E与MME间得以建立NAS signalling connectionUE与MME间的对等S1连接.一个NAS信令连接由两部分串连组成:RRC连接(LTE-Uu)和S1AP连接(S1-MME). 当RRC连接成功建立时,UE就认为NAS信令连接已建立;而RRC释放时,UE认为NAS信令连接已释放.EMM-CONNECTED mode一旦UE与网络间建立了NAS信令连接,则UE迁至EMM-CONNECTED状态(与23.401中的ECM-CONNECTED状态对应)EMM-IDLE modeUE与网络间不存在NAS信令连接,则UE处于EMM-IDLE状态(与23.401中的ECM-IDLE状态对
4、应)TAI list 一组TAI,UE在其指示的TA之间穿越时,不必执行TAU过程DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.基本概念(2)Initial NAS message:触发NAS信令连接的建立,如:ATTACH REQUEST消息就是一个Initial NAS消息Last Visited Registered TAITAI列表中UE最后访问的TA所对应TAILinked Bearer Identity: 此ID标识附加承载资源连接於哪个Default承载.MME area一个MME所服务TA组成的总的区域PDN address由PD
5、N-GW分配给UE的一个IP地址Procedure Transaction Identity由UE动态分配的用于UE所请求承载资源激活,修改和去激活过程的ID.相应过程结束时,PTI将被释放.TAUTracking Area UDATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.UE处理模式说明UE侧NAS信令消息的完整性检测完整性保护由网络侧激活;一旦NAS安全模式控制过程成功结束,则NAS信息强制实施信令完整性保护;除去以下消息,NAS NAS安全模式控制过程成功结束之前,EMM实体不会处理任何NAS信令INDENTITY REQUEST(若请求的
6、标识参数是IMSI)TRACKING AERA UPDATE ACCEPT(FFS)具体的列表需要依据具体的列表需要依据SA3的结论加以补充的结论加以补充DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS更新状态EU(EPS Update)状态包括EU1:UPDATED最近一次Attach或TA更新过程成功进行;EU2:NOT UPDATED最近一次Attach或TA更新过程失败,如:没有来自MME的回应;EU3:ROAMING NOT ALLOWED最近一次Attach或TA更新过程正确进行,但是MME给出否定回应,如:漫游或签约约束;DAT
7、ANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM基本过程主要操作对象:LTE-Uu(无线接口)EMM子层的主要功能是为UE提供移动性支持向网络通知UE的当前位置提供UE ID的安全保护EMM子层的附带功能是为SM(会话管理)子层提供连接管理服务EMM子层触发NAS信令连接的建立DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM过程类型基于不同的发起过程,EMM过程可归为3类EMM公共过程NAS信令连接存在时,总是可以发起EMM公共过程EMM专用过程任何时候只允许运行一个UE发起的EMM专用过程EMM
8、连接管理过程由UE发起并用于建立与网络的安全连接或为数据发送请求资源预留DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM公共过程由网络触发:GUTI re-allocation;Authentication and Security mode; Identification; EMM information DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM专用过程由UE发起,将IMSI附着于网络进而建立相应EMM上下文和缺省承载ATTACH.由UE或网络发起,用于IMSI对于EPS业务的去附
9、着以及EMM上下文和所有承载的释放DETACH.EMM上下文已建立时,由UE触发正常的TA更新;周期性TA更新;TA更新过程也可被用于为发送数据请求资源预留DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM连接管理过程由UE触发,用于建立指向网络的安全上下文或是请求用于发送数据的资源预留service request.服务请求过程仅可在尚没有UE发起的EMM专用过程时发起由网络发起,用于NAS信令连接的建立请求或触发UE的Re-attach(网络故障时)paging DATANG MOBILE COMMUNICATIONS EQUIPMENT
10、CO.,LTD.EMM子层的状态UE和网络的EMM协议使用两个不同的状态机进行描述:LTE-DETACHED .vs. EMM-DEREGISTERED去注册状态;LTE-IDLE .vs. EMM-REGISTERED/EMM-IDLE注册及空闲状态;LTE-ACTIVE .vs. EMM-REGISTERED/EMM-CONNECTED注册及激活状态;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.UE侧EMM子层状态EMM-NULLUE的EPS能力不可用;EMM-DEREGISTERED 没有EMM上下文,MME不知道UE的位置。为了建立EM
11、M上下文,UE必须发起Attach过程;EMM-REGISTERED-INITIATED 发起Attach过程并处回应等待中;EMM-REGISTERED UE中已建立EMM上下文。位置管理(TA更新);数据与信令的接收发送;寻呼回应。EMM-DEREGISTERED-INITIATED UE通过发起detach过程请求EMM的释放,并处于回应等待中;EMM-TRACKING-AREA-UPDATING-INITIATED 开始TA更新过程,并处于回应等待中;EMM-SERVICE-REQUEST-INITIATED 发起服务请求过程,并处于回应等待中;DATANG MOBILE COMMUN
12、ICATIONS EQUIPMENT CO.,LTD.UE侧EMM-DEREGISTERED状态子态EMM-DEREGISTERED.NORMAL-SERVICEEPS的更新状态是EU1或EU2,同时选出了驻留小区且PLMN或TA不在Forbidden列表中EMM-DEREGISTERED.LIMITED-SERVICEEPS的更新状态是EU3,且所选驻留小区处在禁用PLMN或TA之中EMM-DEREGISTERED.ATTEMPTING-TO-ATTACHEPS的更新状态是EU2,且上次Attach过程被MME拒绝EMM-DEREGISTERED.PLMN-SEARCH插有合法USIM的UE
13、开机EMM-DEREGISTERED.NO-IMSI没有插入合法的USIM,没有合法的用户签约信息可用EMM-DEREGISTERED.ATTACH-NEEDED存在可用的签约数据,且由于某种原因必须尽快执行Attach过程;(接入等级控制)EMM-DEREGISTERED.NO-CELL-AVAILABLE无法选出EUTRAN小区,无法提供EPS服务。DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.UE侧EMM-REGISTERED状态子态EMM-REGISTERED.NORMAL-SERVICEUE进入EMMREGISTERED状态后的基本状态
14、EMM-REGISTERED.ATTEMPTING-TO-UPDATE由于未收到网络的回应而导致TA更新过程失败。除去TAU过程,此状态下UE不会发起其它EMM过程,也不能发送或接收数据;EMM-REGISTERED.LIMITED-SERVICEUE选出的小区不能提供正常业务;EMM-REGISTERED.PLMN-SEARCHUE处于PLMN搜索过程中;EMM-REGISTERED.UPDATE-NEEDEDUE有必要进行TA更新,但该UE所处小区的接入等级控制不能接受其接入等级。此状态下,仅可执行TA过程,且一旦UE的接入等级被网络批准,则TA过程立即执行;EMM-REGISTERED.
15、NO-CELL-AVAILABLEUE走出EUTRAN的覆盖,UE不能发起任何用于CELL重选和PLMN重选的相关过程;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.MME侧EMM子层状态EMM-DEREGISTEREDMME没有EMM上下文或EMM上下文标记为detached。相应地,UE处于Detached状态。MME可以响应UE发起的Attach过程;EMM-COMMON-PROCEDURE-INITIATEDMME发起一个公共EMM过程,并处等待中;EMM-REGISTEREDMME中已建立EMM上下文EMM-DEREGISTERED-I
16、NITIATEDMME发起一个detach过程并等待UE的回应DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM-DEREGISTERED状态UE行为该状态的进入UE或MME执行detach过程;Attach请求被MME拒绝;UE开机;UE的所有EPS承载上下文均被释放;UE相应行为NORMAL-SERVICEUE执行Attach过程;LIMITED-SERVICE当UE进入提供正常服务的小区时执行Attach过程NO-IMSIUE只是执行小区选择过程(参见 3GPP TS 36.304)ATTACH-NEEDED一旦UE所选小区允许UE的接入
17、等级之一时,UE立刻开始Attach过程NO-CELL-AVAILABLEUE进行小区选择。当发现小区后,迁入相应的子状态;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.迁回EMM-DEREGISTERED状态的UE行为基于小区选择过程的结果、上一次EMM专用过程的执行结果、UE的EPS更新状态以及UE存储的TA信息和USIM插入与否如果没有发现任何小区,进入NO-CELL-AVAILABLE;没插入USIM或USIM非法,进入NO-IMSI;所选小区属于允许漫游的TA,进入NORMAL-SERVICE;若正进行Attach过程(网络请求的Re-
18、attach),进入ATTEMPTING-TO-ATTACH;若需要进行PLMN重选,进入PLMN-SEARCH;如果所选的CELL属于禁止漫游的TA,进入LIMITED-SERVICE;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM-REGISTERED状态UE行为UE成功进行Attach过程后进入EMM-REGISTERED状态NORMAL-SERVICEUE需要进行正常和周期性的TA更新过程;UPDATE-NEEDED不发送任何的数据或信令信息;进行小区选择或小区重选;一旦选定小区允许UE的接入等级之一,则UE基于EPS更新状态进入相
19、应的子态;NO-CELL-AVAILABLEUE进行小区选择或小区重选过程;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM公共过程GUTI重分配过程鉴权和安全模式过程Identification过程EMM信息过程尚未细化(有待补充)DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM公共过程/ GUTI重分配过程GUTI重分配过程的目的是为指定UE分配一个GUTI以及附带提供新的TAI列表(仅可由EMM-REGISTERED状态的MME触发)GUTI也可隐式地在Attach过程与TA更新过程中
20、被重分配(基本都是在加密模式下进行);网络发起GUTI重分配过程GUTI REALLOCATION COMMAND(携GUTI或可能的TAI列表);T3450定时器;UE完成GUTI重分配过程UE存储GUTI和TA列表;(更新GUTI和TAI列表);GUTI REALLOCATION COMPLETE;MME完成GUTI重分配过程MME停止T3450定时器;新GUTI生效,旧GUTI失效;UEGUTI REALLOCATION COMMANDGUTI REALLOCATION COMPLETEMMEStart T3450Stop TDATANG MOBILE COMMUNICATIONS EQ
21、UIPMENT CO.,LTD.EMM公共过程/鉴权和安全模式过程鉴权/密钥协议(AKA)鉴权密钥的目的是为用户和网络提供互鉴权机制;EPS AKA过程由网络发起并控制UE有可能拒绝网络的认证请求(USIM缺失)鉴权成功后,UE与网络均建立安全上下文;CK与IK变换形成KASME;存储在UE与网络,是EPS密钥架构的基础;安全模式建立和算法协商(FFS)网络发起;UE发起;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.AKA过程(正常)网络发起认证AUTHENTICATION REQUEST;携带计算回应参数必须的信息(参见TS33.821)密钥
22、集指示(配给KASME)T3460定时器;UE发起认证处理认证请求信息,回应AUTHENTICATION RESPONSE消息;基于认证请求信息计算新的KASME;网络完成认证网络收到认证回应;停止T3460,检查回应的合法性;(若失败,则MME与HSS/AuC协商为UE提供新的鉴权参数)EPS密钥标示给定IMSI关联的安全密钥,可基于认证请求参数RAND计算出认证回应参数RES和KASME;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.AKA过程(失败)网络拒绝认证网络区分UE所使用的标示类型GUTI网络会发起Identification过程;
23、IMSIMME发送AUTHENTICATION REJECT;UE收到REJECT消息后进入EU3(ROAMING NOT ALLOWED)状态,并且删除GUTI,TAI List,最后拜访的注册TAI和KSI.UE将中断EMM信令,且进入EMM-DEREGISTEREDUE拒绝认证EPS支持UE对于核心网的认证;如果AUTN参数不正确,或是AUTN参数缺失,UE将拒绝MME发起的认证请求MAC错误;SQN错误;Authentication Unacceptable;UE删除RAND和RES并停止T3417定时器;DATANG MOBILE COMMUNICATIONS EQUIPMENT C
24、O.,LTD.EMM公共过程/ Identification过程网络使用Identification过程请求指定UE提供特定的识别参数,如:IMSI或IMEI网络发起IdentificationIDENTITY REQUEST消息应在Identity type消息元素中包含所请求的Identification参数;UE回应IdentificationEMMCONNECTED状态的UE随时处于回应IDENTITY REQUEST请求的准备状态;UE回应消息包含网络所请求的Identification参数;网络完成Identification收到IDENTITY RESPONSE消息,网络停止T3
25、470定时器UEMMEIDENTITY REQUESTStart T3470IDENTITY RESPONSEStop T3470F DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM专用过程AttachAttach发起;EMM公共过程发起;网络接受Attach;网络拒绝Attach;DetachUE发起UE发起Detach过程;UE完成Detach过程;MME发起网络发起Detach过程;UE完成Detach过程;TA Updating周期更新定时器的控制;TA更新过程的发起;网络接受TA更新;网络拒绝TA更新;DATANG MOBILE C
26、OMMUNICATIONS EQUIPMENT CO.,LTD.EMM专用过程/AttachAttach发起发起处于EMM-DEREGISTERED状态的UE通过ATTACH REQUEST消息发起Attach过程T3410启动;UE进入EMM-REGISTERED-INITIATED状态;GUTI/最后拜访的注册TAI(GUTI不可用,则使用IMSI);UE网络能力/Attach类型/NAS KSI/PDN address allocation IE/DRX参数等等EMM公共过程发起公共过程发起;基于IMSI,GUTI和KSI等信息,网络发起EMM公共过程,如:Identification;
27、 网络接受网络接受Attach;TAI列表更新(可能的专用承载激活);GUTI重分配(EMM-COMMON-PROCEDURE-INITIATED);MME分配默认承载ID并指示给UE;P-GW分配的IP地址(激活默认承载关联的APN);P-GW的IPv6地址(IPv4地址);UE动作:停止T3410,复位Attach尝试计数器和TAU尝试计数器,进入EMM-REGISTERED,设定状态EU1;回应Attach Complete(携带EPS ID)/触发网络侧新GUTI生效;网络拒绝网络拒绝Attach;拒绝并附带相应的理由;UE动作:停止T3410;进入EMM-DEREGISTEREDDA
28、TANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM专用过程/Detach过程用于UE向网络指名其不再接入EPS或网络通知UE不能接入EPSUE关机/USIM缺失/UE的EPS能力不可用,均会触发UE进行Detach过程。UE发起发起Detach过程;Switch off:延迟5秒,用于DETACH REQUEST的发送;Non-switch off: 发送DETACH REQUEST,并进入EMM-DEREGISTERED-INITIATED状态;完成Detach过程;MME发送DETACH ACCEPT;UE在EPS中标记为Inactive;UE
29、和网络进入EMM-DEREGISTERED状态;MME发起发起Detach过程;MME发送DETACH REQUEST,并进入EMM-DEREGISTERED-INITIATED状态;UE回应DETACH ACCEPT:RE-ATTACH Required:去激活上下文及承载,进入EMM-DEREGISTERED状态;紧接着发起Attach过程;RE-ATTACH Not Required:去激活上下文及承载,进入EMM-DEREGISTERED状态;完成Detach过程;网络收到DETACH ACCEPT后,进入EMM-DEREGISTERED状态;DATANG MOBILE COMMUNI
30、CATIONS EQUIPMENT CO.,LTD.EMM专用过程/TAU(1)TAU过程应用目的如下过程应用目的如下网络中UE准确TA注册信息的更新;向网络周期通告UE的可达性;Iu模式向S1模式系统间切换;TAU过程中,MME会发起鉴权过程建立安全模式;周期更新定时器的控制周期更新定时器的控制周期性TA更新定时器T3412网络通过ATTACH ACCEPT消息和TA UPDATE ACCEPT消息下发给UE;UE离开EMM-COONNECTED进入EMM-IDLE时。T3412被重置为其初值;UE进入EMM-COONNECTED时,T3412停止;T3412超时,则周期性TAU过程开始,T
31、3412被重置为其初值;UE处于EMM-REGISTERED.NORMAL-SERVICE之外的状态,若T3412超时,则周期性TAU过程被后延至UE返回EMM-REGISTERED.NORMAL-SERVICE状态后再开始;TA更新过程的发起更新过程的发起UE处于EMM-REGISTERED:TAU REQUEST消息;UE发现自己进入TAI列表之外的TA;T3412定时器超时;发送TAU REQUEST消息后,UE启动T3412并进入EMM-TRACKING-AREA-UPDATING-INITIATED状态;TAU类型:“Active:Uplink DATA Pending”;”Foll
32、ow-on Request Pending”;指示UE中激活承载的EPS Bearer Context IE;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM专用过程/TAU(2)网络接受TA更新MME回应TAU ACCEPT消息,进入EMM-COMMON-PROCEDURE-INITIATED新GUTI以及可能的新TA列表;EPS Bearer Context Status IE;指明MME中活动的EPS承载上下文;PLMN ID (Share Network)“Active” TAU类型MME为所有激活的EPS承载上下文重建Radio和S
33、1承载“Follow-on procedure”与“No Follow-on procedure”;保留NAS信令连接或不保留;UE收到TAU ACCEPT回应重值TA更新尝试计数器/进入EMM-REGISTERED/设定EU1;新GUTI/TAI列表生效;依据EPS Bearer Context Status IE指示,同步上下文状态;如果TAU ACCEPT消息中携带GUTIUE回应TAU COMPLETE消息,确认该GUTI;网络拒绝TA更新;回应TAU REJECT消息(拒绝Cause);UE动作:收到REJECT消息后,UE停止相应的定时器,并基于Reject Cause执行相应动作
34、(FFS)DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM连接管理过程Service Request过程Service Request过程的发起;网络接受Service Request过程;网络拒绝Service Request过程;Paging过程使用S-TMSI通过EUTRAN寻呼DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM连接管理过程/ Service Request过程(1)服务请求过程的目的是将EMM-IDLE状态UE跃迁至EMM-CONNECTED状态,并为上行数据发送建立R
35、adio和S1承载应用条件:网络有需要发送的下行信令;UE或网络的待发的用户数据且UE处于EMM-IDLE状态UE处于EMM-CONNECTED状态,且有上行用户数据待发,但相应的用户面无线承载没有建立;类型:“DATA”或“Paging Response”Service Request过程的发起;UE向MME发送SERVICE REQUEST消息并启动定时器T3417;UE进入EMM-SERVICE-REQUEST-INITIATED和EMM-CONNECTED;消息包含S-TMSI和SERVICE类型;MME收到此消息后,会执行相应的鉴权过程;DATANG MOBILE COMMUNICA
36、TIONS EQUIPMENT CO.,LTD.EMM连接管理过程/ Service Request过程(2)网络接受Service Request过程;Service Type=“DATA” & EMM-IDLE下层的接入层安全建立指示意味着过程成功;Service Type=“DATA” & EMM-CONNECTED下层的用户面无线承载建立指示意味过程成功Service Type=“Paging Response”下层的接入层安全建立指示意味着过程成功;网络为即将传输数据的激活EPS承载上下文建立无线和S1承载;过程成功后,UE进入EMM-REGISTERED状态;网络拒绝Service
37、 Request过程;SERVICE REJECT;基于REJECT Cause,UE执行预定义的动作;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EMM连接管理过程/ Paging过程网络使用Paging过程请求建立与UE的NAS信令连接使用S-TMSI通过EUTRAN寻呼当NAS消息或用户数据待发,而指向相应UE的NAS信令连接不存在EMM实体请求下层(TS36.413)组织寻呼,并启动相应定时器;UE动作收到寻呼指示,UE以Service Request消息回应服务类型:Paging Response;网络停止寻呼过程收到UE的回应,网络
38、停止相应定时器DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.寻呼过程相关消息Paging过程(TS36.413)当收到MME发来的PAGING消息,eNB将在UE注册TA(由TA List IE指示)对应的小区(簇)上执行UE寻呼过程。Paging Cause IE包含在Paging信息中透传给UE针对属于TA List IEs指示TA下辖的每个小区,eNB将在空口为其产生一个寻呼DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Paging(TS36.413)IE/Group NamePresence
39、RangeIE type and referenceSemantics descriptionCriticalityAssigned CriticalityMessage TypeM9.2.1.1YESignoreUE Identity Index valueM9.2.3.10IMSI mod LYESignoreUE Paging IDM9.2.3.13S-TMSIIMSIYESignorePaging DRXM9.2.1.16YESignorePaging CauseM9.2.1.17YESignoreList of TAIsYESignoreTAI List Item EACHignor
40、eTA IdentityMFFS-DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Paging CauseENUMERATED( Terminating Conversational Call, Terminating Streaming Call, Terminating Interactive Call, Terminating Background Call, Terminating Low Priority Signalling, .,Terminating High Priority Signalling) DATANG MOBILE C
41、OMMUNICATIONS EQUIPMENT CO.,LTD.EMM实体对EMM状态消息的接收发送EMM状态消息的目的是在任何时刻上报EMM协议数据检测错误;可由MME或UE发起;收到EMM状态消息后,无线接口不会发生状态跃迁或特有的动作;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程ESM子层状态IP地址分配网络发起的ESM过程UE请求的ESM过程DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程/ ESM子层状态(1)UE中的ESM子层状态BEARER CONT
42、EXT INACTIVE不存在EPS承载上下文BEARER CONTEXT ACTIVE UEUE中的EPS承载上下文处于活动态DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程/ ESM子层状态(2)MME中的ESM子层状态BEARER CONTEXT INACTIVE不存在EPS承载上下文BEARER CONTEXT ACTIVE PENDING网络已发起EPS承载上下文激活BEARER CONTEXT ACTIVE网络侧EPS承载上下文已处于活动态BEARER CONTEXT INACTIVE PENDING网络已发起EPS承
43、载上下文去激活BEARER CONTEXT MODIFY PENDING网络已经发起EPS承载上下文修改过程DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程/ ESM子层状态(3)MME中的ESM子层状态图DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程/ IP地址分配(1)UE可在Attach过程中获得IP地址,也可IETF方案在缺省承载建立之后获取IP地址基于IETF的IP地址获取方法有通过IPv6无状态地址自动配置方案获得IPv6前缀;基于DHCPv4方案获取I
44、Pv4地址;基于无状态DHCPv6获取IPv6参数;基于DHCPv6的短于/64的IPv6前缀;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程/ IP地址分配(2)通过NAS信令获取IP地址UE在PDN Address Allocation IE中指明IP协议栈能力(ATTACH请求或PDN CONNECTIVITY请求);网络基于UE的IP版本能力/UE签约数据/归属和拜访网络的策略等信息为UE分配IP地址;PDN Address IE;如果PDN Address Allocation IE指明IPv6地址请求,则网络应用IP
45、v6无状态地址自动配置;PDN Address IE(IPv6前缀和接口ID);丢弃此次获取的IPv6前缀,而是使用Router Solicitation / Advertisement过程获取的IPv6前缀;接口ID用于配置本地链路地址;PDN address IE中返回的IPv6 prefix 和Router Advertisement返回的IPv6 prefix 应当是相同的;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程/ IP地址分配(3)IPv6无状态地址分配缺省承载建立完毕后,UE会发送Router Solicit
46、ation消息来触发网络回应Router Advertisement消息;PDN GW在缺省承载建立完成后,立即周期地发送Router Advertisement消息;Router Advertisement消息清除M Flag (Managed Address Configuration),以便向UE指示“无状态地址分配”将执行;如果附加的参数通过DHCPv6获取,则Router Advertisement消息置位O Flag (Other Configuration);Router Advertisement消息返回一个IPv6前缀携带前缀的Prefix Information Optio
47、n置位A Flag (Autonomous Address-Configuration)并清除L Flag (On-Link);UE构造IPv6地址时,可是使用任意的接口ID(对接口ID的取值没有限制,因为分配给UE的IPv6前缀是唯一的,PDN GW会保证Router Advertisement消息中返回IPv6前缀的唯一性)。因此,UE不必进行Duplicate Address Detection过程。DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程/ IP地址分配(4)基于DHCPv4的IPv4地址分配如果在Attach过程
48、之后,UE希望配置IPv4地址和附加的IPv4参数,UE将发送DHCPDISCOVER消息并启用DHCPv4(参见IETF RFC 2131);若在Attach过程获取了IPv4地址,但UE需要的附加IPv4参数没有一并提供,则UE会使用DHCPv4来配置剩余的IPv4参数;PDN GW针对UE的请求进行回应;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程/ IP地址分配(5)基于无状态DHCPv6的IPv6参数配置如果Router Advertisement消息的O Flag (Other Configuration)被置位,
49、而且UE需要配置Attach过程或IPv6地址分配过程没有设定的附加IP参数(如:DNS Server的地址),UE会发送携带期望选项的DHCPv6 Information-Request消息(参见RFC3736);PDN GW针对UE的请求进行回应;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程/ IP地址分配(6)基于DHCPv6的IPv6前缀托管完成缺省承载建立及IP地址分配过程后,基于运营商的策略,UE可以请求/获取额外的/64或较短的Prefixes;UE充当请求路由器;基于S5-GTP架构,PDN GW充任托管路由器
50、;参见RFC3633;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程/网络发起的ESM过程Dedicated EPS Bearer Context Activation Procedure网络发起;UE接受;UE拒绝;EPS Bearer Context Modification Procedure网络发起;UE接受;UE拒绝;EPS Bearer Context Deactivation Procedure网络发起;UE接受;UE是否可以拒绝,有待研究;DATANG MOBILE COMMUNICATIONS EQUIPMEN
51、T CO.,LTD.网络发起的ESM过程/专用EPS承载上下文激活过程(1)建立具有专用QoS和TFT的EPS承载上下文。可由网络发起,也可由UE请求发起。可作为Attach的一部分,若Attach失败,意味相应专用承载激活过程失败;网络发起专用EPS承载上下文激活ACTIVATE DEDICATED EPS BEARER CONTEXT REQUEST 嵌在Radio Bearer Setup Request中;MME进入BEARER CONTEXT ACTIVE PENDING EPS Bearer ID/Uplink TFT/Linked EPS Bearer ID/PTI(UE)/Pr
52、e-LTE支持;UE接受专用EPS承载上下文激活UE拒绝专用EPS承载上下文激活DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.网络发起的ESM过程/专用EPS承载上下文激活过程(2)UE接受专用EPS承载上下文激活在TFT生效之前检测其有效性;ACTIVATE DEDICATED EPS BEARER CONTEXT ACCEPT;嵌入在Radio Bearer Setup Response;EPS Bearer ID;PTI(UE) linked EPS bearer identity(默认承载/IP地址/PDN关联信息 )UE进入BEARER
53、 CONTEXT ACTIVE 状态;MME收到UE的接受回应后进入BEARER CONTEXT ACTIVE; UE拒绝专用EPS承载上下文激活ACTIVATE DEDICATED EPS BEARER CONTEXT REJECT;如:PTI信息无法匹配;MME进入BEARER CONTEXT INACTIVE 并终止专用EPS承载上下文激活过程;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.网络发起的ESM过程/EPS承载上下文修改过程(1)由网络发起修改QoS或TFT/两者兼顾;网络发起专用承载上下文修改BEARER CONTEXT IN
54、ACTIVE EPS bearer id和TFT、PTI(UE);嵌入在Radio Bearer Modify Request (更新QoS);嵌入在Downlink NAS Transport (非QoS更新);MME进入BEARER CONTEXT MODIFY PENDING;UE接受专用承载上下文修改UE启用TFT前检验其合法性;SESSION MANAGEMENT CONFIGURATION ACCEPT;嵌入Radio Bearer Modify Response(更新QoS ) ;嵌入Uplink NAS Transport(非QoS更新);UE基于PTI关联自已请求的过程承载资
55、源配置过程或承载资源释放过程;收到UE的接受回应,MME进入BEARER CONTEXT ACTIVE;UE拒绝专用承载上下文修改DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.网络发起的ESM过程/EPS承载上下文修改过程(2)UE拒绝专用承载上下文修改SESSION MANAGEMENT CONFIGURATION REJECT;EPS Bearer ID、Cause(details FFS);PTI(PTI无法关联);MME收到UE的拒绝消息进入BEARER CONTEXT ACTIVE;终止EPS专用承载上下文修改过程;DATANG MOB
56、ILE COMMUNICATIONS EQUIPMENT CO.,LTD.网络发起的ESM过程/EPS承载上下文去激活过程网络发起专用承载上下文去激活;NAS信令连接存在:SESSION MANAGEMENT CONFIGURATION REQUESTDeletion Indicator/EPS bearer ID/PTI(UE);嵌入RRC Radio Bearer Release Request;NAS信令连接不存在:ESM实体(MME中)将自行去激活承载,与UE没有ESM信令交互;ESP承载上下文状态可在下一次EMM-IDLE向EMM-CONNECTED跃迁过程中取得同步;Service
57、 Request/TAU;UE接受专用承载上下文去激活;依据Deletion Indicator/EPS bearer ID,UE实施EPS承载上下文的去激活;SESSION MANAGEMENT CONFIGURATION ACCEPT;EPS Bearer ID;嵌入RRC message Radio Bearer Release Response;PTI的使用FFS;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理过程/ UE请求的ESM过程UE请求的PDN连接过程;UE请求的PDN断开过程;UE请求的承载资源分配过程;UE请求
58、的承载资源释放过程;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.UE请求的ESM过程/ UE请求的PDN连接过程UE向另一个PDN请求默认EPS承载建立,以便UE可以同时接入多个PDNs;UE请求的PDN Connectivity过程发起;UE发送PDN CONNECTIVITY REQUEST; Requested APN、 PTI、IP 地址分配信息; 网络接受UE请求的PDN Connectivity过程;MME判定连接可建:MME发起附加default EPS bearer context的建立;PDN CONNECTIVITY ACC
59、EPT消息;嵌入Radio Bearer Setup Request ;EPS bearer ID、PTI 、PCO(配置参数,Error Code);网络拒绝UE请求的PDN Connectivity过程;MME回应PDN CONNECTIVITY REJECT;PTI 、cause (设定值及相关动作FFS);DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.UE请求的ESM过程/ UE请求的PDN断开过程与指定PDN断开连接,相应EPS承载上下文(包括默认承载)均被释放;UE请求的PDN Disconnection过程发起;UE发送PDN DI
60、SCONNECT REQUEST;网络接受UE请求的PDN Disconnection过程;MME发起 上下文去激活过程 MME发送 DEACTIVATE EPS BEARER CONTEXT REQUEST消息;linked EPS bearer identity、ESM cause( regular deactivation ); 收到UE回应的DEACTIVATE EPS BEARER CONTEXT ACCEPT消息:MME释放指定PDN相关的网内所有资源;DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.UE请求的ESM过程/ UE请求的承
61、载资源分配过程UE为新的Service Data Flow请求分配承载资源;UE请求的承载资源分配过程发起;UE发送BEARER RESOURCE ALLOCATION REQUEST;QoS、Linked EPS Bearer ID、PTI、UL/DL TFT;网络接受UE请求的承载资源分配过程;检查UE请求的承载资源是否可以建立;允许建立:MME发起专用EPS承载上下文激活过程或专用EPS承载上下文修改过程;网络拒绝UE请求的承载资源分配过程;拒绝建立:BEARER RESOURCE ALLOCATION REJECT;PTI、Cause(details FFS);DATANG MOBIL
62、E COMMUNICATIONS EQUIPMENT CO.,LTD.UE请求的ESM过程/ UE请求的承载资源释放过程与专用Service Data Flow相关的承载释放;UE请求的承载资源释放过程发起;UE发送BEARER RESOURCE RELEASE REQUEST;Linked EPS Bearer ID、PTI、Uplink/Downlink TFT;网络接受UE请求的承载资源释放;MME检查相应承载资源可否释放;可以释放:发起专用承载上下文去激活或专用承载上下文修改过程;网络拒绝UE请求的承载资源释放;不能释放:BEARER RESOURCE RELEASE REJECT;P
63、TI、Cause(detail FFS)DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS移动性管理消息Attach RequestAttach AcceptAttach CompleteAttach RejectDetach Request(UE发起Detach)Detach Request(UE终结Detach )Detach Accept( UE发起Detach )Detach Accept( UE终结Detach )DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Attach request
64、 Message type:ATTACH REQUESTSignificance:dualDirection:UE to networkInformation ElementProtocol discriminatorAttach request message identityOld GUTI or IMSIUE network capabilityAttach typeNAS key set identifierLast visited registered TAIMessage authentication codeNAS message sequence number for upli
65、nkPDN address allocationDRX parameterProtocol configuration DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Attach accept Message type:ATTACH ACCEPTSignificance:dualDirection:network to UEInformation ElementProtocol discriminatorAttach accept message identityPeriodic TA update timerTAI listEPS defaul
66、t bearer identityAccess point nameMessage authentication codeNAS message sequence number for downlinkGUTIPDN address informationSession management configurationProtocol configuration DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Attach complete Message type:ATTACH COMPLETESignificance:dualDirection
67、:UE to network Information ElementProtocol discriminatorAttach complete message identityEPS default bearer identityMessage Authentication CodeNAS message sequence number for DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Attach rejectMessage type:ATTACH REJECTSignificance:dualDirection:network to UE
68、Information ElementProtocol discriminatorAttach reject message identityEMM causeMessage authentication codeNAS message sequence number for DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Detach request (UE originating detach) Message type:DETACH REQUESTSignificance:dualDirection:UE to networkInformat
69、ion ElementProtocol discriminatorDetach request message identityDetach typeSpare half octetGUTINAS message sequence number for uplinkMessage Authentication CDATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Detach request (UE terminated detach) Message type:DETACH ACCEPTSignificance:dualDirection:netwo
70、rk to UE Information ElementProtocol discriminatorDetach request message identityDetach typeSpare half octetNAS message sequence number for downlinkMessage Authentication CodeEMM DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Detach accept (UE originating detach) Message type:DETACH ACCEPTSignifican
71、ce:dualDirection:network to UE Information ElementProtocol discriminatorDetach accept message identityNAS message sequence number for downlinkMessage Authentication CDATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Detach accept (UE terminated detach) Message type:DETACH ACCEPTSignificance:dualDirecti
72、on:UE to networkInformation ElementProtocol discriminatorDetach accept message identityNAS message sequence number for uplinkMessage Authentication CDATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.EPS会话管理消息(1)Activate default EPS bearer context requestActivate default EPS bearer context acceptActivat
73、e default EPS bearer context rejectActivate dedicated EPS bearer context requestActivate dedicated EPS bearer context acceptActivate dedicated EPS bearer context rejectModify EPS bearer context requestModify EPS bearer context acceptModify EPS bearer context rejectDeactivate EPS bearer context reque
74、stDeactivate EPS bearer context DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Activate default EPS bearer context request Message type:ACTIVATE DEFAULT EPS BEARER CONTEXT REQUESTSignificance:dualDirection:network to UE Information ElementProtocol discriminatorEPS bearer identityActivate default EPS
75、 bearer context request message identityProcedure transaction identifier PDN addressAccess point nameUplink TFTNegotiated QoSRadio priorityPacket Flow IdentifierProtocol configuration optionsNAS message sequence number for downlinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD
76、.Activate default EPS bearer context accept Message type:ACTIVATE DEFAULT EPS BEARER CONTEXT ACCEPTSignificance:dualDirection:UE to network Information ElementProtocol discriminatorEPS bearer identityActivate default EPS bearer context accept message identityProtocol configuration optionsNAS message
77、 sequence number for uplinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Activate default EPS bearer context reject Message type:ACTIVATE DEFAULT EPS BEARER CONTEXT REJECTSignificance:dualDirection:UE to network Information ElementProtocol discriminatorEPS bearer identityActi
78、vate default EPS bearer context reject message identityESM causeProtocol configuration optionsNAS message sequence number for uplinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Activate dedicated EPS bearer context request Message type:ACTIVATE DEDICATED EPS BEARER CONTEXT R
79、EQUESTSignificance:dualDirection:network to UE Information ElementProtocol discriminatorEPS bearer identityActivate dedicated EPS bearer context accept message identityProtocol configuration optionsNAS message sequence number for uplinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO
80、.,LTD.Activate dedicated EPS bearer context accept Message type:ACTIVATE DEDICATED EPS BEARER CONTEXT ACCEPTSignificance:dualDirection:UE to networkInformation ElementProtocol discriminatorEPS bearer identityActivate dedicated EPS bearer context request message identityProcedure transaction identifi
81、erLinked EPS bearer identityUplink TFTNegotiated QoSNegotiated LLC SAPIRadio priorityPacket Flow IdentifierProtocol configuration optionsNAS message sequence number for downlinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Activate dedicated EPS bearer context reject Message
82、type:ACTIVATE DEDICATED EPS BEARER CONTEXT REJECTSignificance:dualDirection:UE to networkInformation ElementProtocol discriminatorEPS bearer identityActivate dedicated EPS bearer context reject message identityESM causeProtocol configuration optionsNAS message sequence number for uplinkMessage authe
83、ntication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Modify EPS bearer context request Message type:MODIFY EPS BEARER CONTEXT REQUESTSignificance:dualDirection:network to UEInformation ElementProtocol discriminatorEPS bearer identityModify EPS bearer context request message identityProcedure tra
84、nsaction identifierUplink TFTPDN address informationNew QoSNegotiated LLC SAPIRadio priorityPacket Flow IdentifierProtocol configuration optionsNAS message sequence number for downlinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Modify EPS bearer context accept Message type:
85、MODIFY EPS BEARER CONTEXT ACCEPTSignificance:dualDirection:UE to networkInformation ElementProtocol discriminatorEPS bearer identityModify EPS bearer context accept message identityProtocol configuration optionsNAS message sequence number for uplinkMessage authentication DATANG MOBILE COMMUNICATIONS
86、 EQUIPMENT CO.,LTD.Modify EPS bearer context reject Message type:MODIFY EPS BEARER CONTEXT REJECTSignificance:dualDirection:UE to network Information ElementProtocol discriminatorEPS bearer identityModify EPS bearer context reject message identityESM causeProtocol configuration optionsNAS message se
87、quence number for uplinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Deactivate EPS bearer context request Message type:DEACTIVATE EPS BEARER CONTEXT REQUESTSignificance:dualDirection:network to UEInformation ElementProtocol discriminatorEPS bearer identityDeactivate EPS bea
88、rer context request message identityProcedure transaction identifierESM causeTear down indicatorProtocol configuration optionsNAS message sequence number for downlinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Deactivate EPS bearer context accept Message type:DEACTIVATE EPS
89、 BEARER CONTEXT ACCEPTSignificance:dualDirection:UE to network Information ElementProtocol discriminatorEPS bearer identityDeactivate EPS bearer context accept message identityProtocol configuration optionsNAS message sequence number for uplinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUI
90、PMENT CO.,LTD.EPS会话管理消息(2)PDN connectivity requestPDN connectivity rejectPDN disconnect requestPDN disconnect rejectBearer resource allocation requestBearer resource allocation rejectBearer resource release requestBearer resource release rejectESM SDATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.PDN
91、connectivity request Message type:PDN CONNECTIVITY REQUESTSignificance:dualDirection:UE to network Information ElementProtocol discriminatorProcedure transaction identifierPDN connectivity request message identityAccess point namePDN address allocationProtocol configuration optionsNAS message sequen
92、ce number for uplinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.PDN connectivity reject Message type:PDN CONNECTIVITY REJECTSignificance:dualDirection:network to UEInformation ElementProtocol discriminatorProcedure transaction identifierPDN connectivity reject message ident
93、ityESM causeProtocol configuration optionsNAS message sequence number for downlinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.PDN disconnect request Message type:PDN DISCONNECT REQUESTSignificance:dualDirection:UE to networkInformation ElementProtocol discriminatorProcedure
94、 transaction identifierPDN disconnect request message identityLinked EPS bearer identityProtocol configuration optionsNAS message sequence number for downlinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.PDN disconnect reject Message type:PDN DISCONNECT REJECTSignificance:dua
95、lDirection:network to UE Information ElementProtocol discriminatorProcedure transaction identifierPDN disconnect reject message identityESM causeProtocol configuration optionsNAS message sequence number for downlinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Bearer resource
96、 allocation request Message type:BEARER RESOURCE ALLOCATION REQUESTSignificance:dualDirection:UE to networkInformation ElementProtocol discriminatorProcedure transaction identifierBearer resource allocation request message identityLinked EPS bearer identityRequired SDF QoSUL/DL TFTProtocol configura
97、tion optionsNAS message sequence number for uplinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Bearer resource allocation reject Message type:BEARER RESOURCE ALLOCATION REJECTSignificance:dualDirection:network to UE Information ElementProtocol discriminatorProcedure transact
98、ion identifierBearer resource allocation reject message identityESM causeProtocol configuration optionsNAS message sequence number for downlinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Bearer resource release requestMessage type:BEARER RESOURCE RELEASE REQUESTSignificance
99、:dualDirection:UE to networkInformation ElementProtocol discriminatorProcedure transaction identifierBearer resource release request message identityLinked EPS bearer identityDL TFTProtocol configuration optionsNAS message sequence number for uplinkMessage authentication DATANG MOBILE COMMUNICATIONS
100、 EQUIPMENT CO.,LTD.Bearer resource release reject Message type:BEARER RESOURCE RELEASE REJECTSignificance:dualDirection:network to UEInformation ElementProtocol discriminatorProcedure transaction identifierBearer resource release reject message identityESM causeProtocol configuration optionsNAS mess
101、age sequence number for downlinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.ESM Status Message type:ESM STATUSSignificance:dualDirection:both Information ElementProtocol discriminatorEPS bearer identityProcedure transaction identifierESM status message identityESM causeNAS
102、message sequence number for uplink or downlinkMessage authentication DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.MM消息编码消息编码DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Protocol Discriminator用于指示标准的L3消息所属的L3协议(参见TS24.007)DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.Radio Priority使用Radio Priori
103、ty信息元素的目的是指定UE使用下层传输PDP上下文相关数据或UE发起的SMS传输时的优先等级(参见TS24.008)编码优先级001priority level 1 (Highest)010priority level 2011priority level 3100priority level 4 (Lowest)XXX所有其它编码值均解析为priority level 4 (Lowest)DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.NAS信息传输相关消息信息传输相关消息通过S1接口携带UE-MME间的NAS信令.NAS消息在eNB中是不进行
104、解码. 该传输过程可使用现有的UE逻辑S1连接.若UE的S1连接不存在,则会发起相应的S1接口的建立过程INITIAL UE MESSAGE DOWNLINK NAS TRANSPORT UPLINK NAS TRANSPORT DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.NAS信息传输相关消息(1)INITIAL UE MESSAGE当eNB从无线接口收到一个指向MME的NAS消息,且相应的UE关联S1连接存在 ,则eNB将发起NAS Transport 过程并发送INITIAL UE MESSAGE 给MMENAS message包含在NA
105、S-PDU IE中eNB将为该UE分配唯一的eNB S1-AP UE IdentityeNB会将此ID携带於INITIAL UE MESSAGE消息中 DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.NAS信息传输相关消息(2)DOWNLINK NAS TRANSPORT如果一个NAS消息需要从MME传递至UE,且UE关联的S1连接存在,或者MME收到INITIAL UE MESSAGE消息中携带的eNB S1-AP UE Identity IE,则MME将向eNB发送DOWNLINK NAS TRANSPOR消息如果UE关联的S1连接不存在,则M
106、ME会为相应UE分配一个唯一的MME S1-AP UE Identity,并在DOWNLINK NAS TRANSPORT消息携带该ID. 当eNB收到MME S1-AP UE Identity IE时,UE关联的S1连接就已建立NAS-PDU IE包含MME UE消息,eNB仅透传该消息而不作解码 DOWNLINK NAS TRANSPORT消息带有Serving PLMN IEHandover Restriction List IE( 漫游或接入约束)DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.NAS信息传输相关消息(3)UPLINK NA
107、S TRANSPORT当收到来自无线接口指向MME的NAS消息,且相应的UE关联S1连接存在, 则eNB将向MME发送UPLINK NAS TRANSPORT消息在NAS-PDU IE中携带该NAS消息NAS-PDU IE中UE MME间的NAS消息在eNB中不作解码仅是透传DATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.缩写参考缩写参考缩写释义ARPAllocation Retention PriorityECMEPS Connection ManagementEMMEPS Mobility ManagementESMEPS Session Ma
108、nagementGUMMEIGlobally Unique MME IdentifierHRPDHigh Rate Packet DataMMECMME CodePTIProcedure Transaction IdentitySDFService Data FlowTACTracking Area CodeTAITracking Area IdentityTFTTraffic Flow TemplateGUTIGlobally Unique Temporary IDATANG MOBILE COMMUNICATIONS EQUIPMENT CO.,LTD.参考文献TS23.401基于GTP的SAE架构及功能TS24.301UE与MME间的NAS接口TS36.331EUTRAN的RRC协议TS33.821EPS安全协议TR21.9053GPP协议词汇3GPP组织网址http:/www.3gpp.org谢谢您的关注HTTP:/WWW.DATANGMOBILE.CN大唐移动西安分公司系统部标准组