EPC核心网-系统架构-系统介绍课件

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1、Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,11/7/2009,#,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Agenda,EPC,介绍,EPC,关键技术介绍,EPC,业务流程介绍,EPC,的标准化进展,3,1,可行性研究阶段,2004,年,12,月正式立项至,2006,年,6,月完成。主要是网络结构优化的可行性研究，,输出的基准协议是,3GPP,TR 23.88

2、2:3GPP system architecture evolution(SAE):Report on technical options and conclusions,2,Stage1,（需求阶段）,定义,SAE,的需求，,2006,年,12,月完成,输出的基准协议是,3GPP TS 22.278:Service requirements for evolution of the system architecture:,3,Stage2,（技术实现阶段）,定义,SAE,的网络结构、功能实体及其相互接口。,2008,年,6,月完成,输出的基准协议包括：,3GPP TS 23.401:Gen

3、eral Packet Radio Service(GPRS)enhancements for Long Term Evolution(LTE)access“,3GPP TS 23.402:3GPP System Architecture Evolution(SAE):Architecture enhancements for non-3GPP accesses,4,Stage3（协议实现阶段）,定义各接口上的具体协议。200,9,年,3,月完成,当前,定义的协议有,：,3GPP TR 24.801:3GPP System Architecture Evolution(SAE);CT WG1

4、aspects,3GPP TR 29.803:3GPP System Architecture Evolution(SAE):CT WG4 aspects,3GPP TR 29.804:3GPP System Architecture Evolution(SAE):CT WG3 aspects,3GPP,标准组织与制定阶段,阶段,1,：需求,SA1/NGMN,阶段,2,：结构,EPS by SA2,LTE by RAN3,阶段,3,：详细实现,EPC,CT1/3/4,SA3/5/5,LTE,RAN1/2/3/4/5,SA3/5,RAN1-,物理层,RAN2-L2,与,L3,无线协议,RAN3-

5、,结构与,S1/X2,接口,RAN4-RF,与,RRM,性能要求,RAN5-,终端测试,EPC主要协议介绍,TS,23.401,GPRS enhancements for E-UTRAN access,TS,23.402,Architecture enhancements for non-3GPP accesses,TS,23.203,Policy and charging control architecture,TS,23.216,Single Radio Voice Call Continuity(SRVCC),TS,23.272,CS fallback in Evolved Packe

6、t System(EPS)Stage 2,TS,33.401,3GPP SAE Security architecture,TS,33.402,3GPP SAE Security aspects of non-3GPP accesses,EPC Architecture(3GPP Standard),SGSN,HSS,MME,SGW,PGW,BSC,RNC,BTS,NodeB,eNodeB,Operators Services,PCRF,Control plane traffic,User plane traffic,EPC,S6d,S6a,S3,S4,S10,S11,S1-MME,S1-U,

7、S5(GTP),Rx,Gx,SGi,SAE-GW:,SGW+PGW,HSS,MME,SAE-GW realize LTE access and interworking with Non 3GPP network.,Based on GTP mobility,S4 SGSN support legacy UTRAN&GERAN access.,Based on MIP mobility,ePDG/AAA/PCRF increase network QoS and security.,Flat,Architecture,Access Agnostic,Separation of control

8、plane from user plane,and all IP,ePDG,S2b,S2a/c,Non 3GPP,Access Network,S10 x,S10 x,3GPP,CS Core,Mobility based on,MIP,Handover Optimization,6,EPC主要接口介绍,接口,协议,协议号,相关实体,接口功能,S1-MME,S1AP,36.413,eNodeB-MME,用于传送会话管理,(SM),和移动性管理,(MM),信息,S1-U,GTPv1,29.060,eNodeB S-GW,在,GW,与,eNodeB,设备间建立隧道，传送数据包,S11,GTPv2,

9、29.274,MME S-GW,采用,GTP,协议，在,MME,和,GW,设备间建立隧道，传送信令,S3,GTPv2,29.274,MME SGSN,采用,GTP,协议，在,MME,和,SGSN,设备间建立隧道，传送信令,S4,GTPv2,29.274,S-GW SGSN,采用,GTP,协议，在,S-GW,和,SGSN,设备间建立隧道，传送数据和信令,S6a,Diameter,29.272,MME-HSS,完成用户位置信息的交换和用户签约信息的管理,S10,GTPv2,29.274,MME-MME,采用,GTP,协议，在,MME,设备间建立隧道，传送信令,S12,GTPv1,29.060,S-

10、GW UTRAN,在,UTRAN,与,GW,之间建立隧道，传送数据,S2a,PMIPv6/MIPv4,RFC5213,P-GW Trusted Non-3GPP IP Accesse,用于传送非,3GPP,接入的业务接入信息,S5/S8,GTPv2,29.274,S-GW P-GW,采用,GTP,协议，在,GW,设备间建立隧道，传送数据包,支持3GPP接入，EPC新增网元的主要功能点,MME,Serving GW,PDN GW,NAS,信令处理,NAS,信令的安全保护,3GPP,内不同节点之间的移动性管理,空闲移动终端的跟踪和可达,TA List,管理,PDN GW,和,Serving GW,

11、选择,MME,和,SGSN,的选择,合法监听,漫游控制,安全认证,承载管理,eNodeB,之间的切换的本地锚点,E-UTRAN,空闲模式下数据缓存以及触发网络侧,Service Request,流程,合法监听,数据包路由和转发,上下行传输层数据包标记,基于用户和,QCI,力度的统计（用于运营商间计费）,基于用户、,PDN,和,QCI,力度的上行和下行的计费,基于用户的包过滤,合法监听,IP,地址分配,上下行传输层数据包标记,PCC,non-GBR,的基于,AMBR,的下行速率控制,GBR,的基于,MBR,的下行速率控制,DHCPv4,和,DHCPv6,（,client,、,server,）,上

12、行和下行的承载绑定,上行承载绑定校验,类似,SGSN,的控制面功能,类似,SGSN,的用户面功能,类似,GGSN,的功能,TA(Tracking Area)List,移动管理优化,TA List1,TA List2,Idea of TA List,All the tracking areas in a Tracking Area List to which a UE is registered are served by the same serving MME.,The MME may initiate the GUTI Reallocation procedure to reallocat

13、e TAI list at any time when a signaling association is established between UE and MME.,The TAI list may also be reallocated by the Attach or the Tracking Area Update procedures,The UE doesnt need trigger TA update procedure when the UE moves in the same TA List.,The Tracking Area Identity is constru

14、cted from the MCC(Mobile Country Code),MNC(Mobile Network Code)and TAC(Tracking Area Code).,TA 1,TA 2,TA 5,TA 4,TA 3,MME,ISR(Idle Signaling Reduction),移动管理优化,TA1,TA3,RA3,TA2,TA4,TA5,RA1,RA2,TA List1,TA List2,ISR,Combined Area=TA List+RA,The UE doesnt need trigger TA update procedure when it moves in

15、 the combined area.,ISR is not recommended to deploy in commercial phase because of its complexity and less benefits.,Combined area,RA4,IPv4v6双栈（Dual Stack）EPS承载处理,IPv4v6,承载的优势,承载类型,LTE,2/3G,备注,IPv4,Y,Y,UE,获取,IPv4,地址转发,IPv4,报文,Ipv6,Y,Y,UE,获取,IPv6,地址转发,IPv6,报文,IPv4v6,Y,Y/N,UE,获取,IPv4,和,v6,地址和转发,IPv4,

16、和,v6,报文,解决在1个PDP上下文中传送IPv4和IPv6地址的用户数据，减少,了需要的承载上下文数量,终端,SGSN/MME,PDN-GW,根据终端的能力在请求建立的承载类型,具备,IPv6,和,IPv4,能力请求,IPv4v6,IPv4,终端请求,IPv4,IPv6,终端请求,IPv6,终端能力不明，请求,IPv4v6,MME/SGSN,根据如下条件，向,PGW,请求标示,Dual Stack Flag,UE,是否签约,Dual Stack,，否则拒绝，否则返回给,UE,“,subscription limitation,”,UE,是否可能切换到不支持,IPv4v6,网络，是则返回给,UE,“,single address bearers only,”,PGW,检查如下条件，判断是否接受,Dual Stack,请求,若不允许该,APN,使用两个,IP,地址，则只分配一个,IP,地址，并返回给,UE,“,network preference,”,如果允许该,APN,使用两个,IP,地址，则分配,IPv4,地址和,IPv6,地址，接受请求,R8,网络,IPv4v6,双栈承载的处理方