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1、5G核心网关键技术和功能介绍,2,目录5G核心网架构和各主要NF功能描述5G核心网关键技术介绍基于服务的构架SBA控制面和用户面分离CUPS计算与存储分离网络切片构架和选择NSSF注册管理和连接管理RM/CM用户标识不同的注册管理流程和功能几种不同的连接管理状态分析会话管理SMPDU会话的一些特性介绍会话和业务连续性模式介绍基于流的QoS模型介绍边缘计算和本地路由功能5G的关键呼叫流程注册流程PDU会话建立流程切换流程,1.5G核心网架构和各主要NF功能描述,5G Service Based Architecture(SBA),AUSF,UE,(R)AN,UPF,N2,N3,N1,N9,AMF
2、,N4,AF,PDN,N6,N4,SMF,UDM,USER PLANE,Local PDN,UPF,N1,N2,UE,AP,N3IWF,N3,NEF,3rd party,appl.,DSF,PCFNRFCONTROL PLANE,Authenti-fication,Access&Mobility Mgmt,Unified data mgmt,5G Core(SBA)Service Based Architecture,Application,Session Function,Mgmt,Data Storage Function,User Plane Function,Policy Ctrl F
3、unction,Network repository Function,Service based interfaces(APIs)“on demand”Network Exposure function,4,Access and Mobility Management function(AMF),Mandatory functionalityTermination of RAN control interface(N2)Termination of NAS(N1),NAS ciphering and integrity protectionAccess authentication and
4、authorizationSecurity anchor function and security context mgmt for access security key handlingRegistration,connection,reachability,and mobility managementSession mgmt message transport and proxy between UE and Session Management Function(SMF)SMS transport between UE and SMSFLawful interceptionOpti
5、onal functionalitySupport of mandatory functionality for non-3GPP accessN3IWF N2 interface termination and NAS signaling,5G System Architecture,AMF,SMF,PCF,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,IMS,N3IWF,NSSF,N5,SMSFEIR,NRFUDSF,UDMUDRNEF,n3GPP,All network functions can interact with NRF,UDSF,UDM,UDR,and NEF
6、 as necessary,BGW,HSS,TAS,N6,MRF,LMF,5,Nokia 2018,Session Management function(SMF),Session establishment,modify and release inc N3 tunnelUE IP address allocation&managementSelection and control of UP function(UPF)UPF traffic steering configuration to proper destinationTermination of interfaces towar
7、ds Policy control functionsControl part of policy enforcement and QoSCharging data collection and support of charging interfacesControl and coordination of charging data collection at UPFTermination of SM parts of NAS messagesDownlink Data NotificationInitiator of AN specific SM information via AMF
8、over N2Determine SSC mode of a sessionLawful interceptRoaming functionality(local QoS,charging,LI),5G System Architecture,AMF,SMF,PCF,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,IMS,N3IWF,NSSF,N5,SMSFEIR,NRFUDSF,UDMUDRNEF,n3GPP,All network functions can interact with NRF,UDSF,UDM,UDR,and NEF as necessary,BGW,HSS,
9、TAS,N6,MRF,LMF,6,Nokia 2018,User plane function(UPF),Anchor point for Intra-/Inter-RAT mobility(when applicable)External PDU session point of interconnect to Data NetworkPacket routing&forwardingPacket inspection and User plane part of Policy rule enforcementLawful intercept(UP collection)Traffic us
10、age reporting.Uplink classifier to support routing traffic flows to a data network.Branching point to support multi-homed PDU session.QoS handling for user plane,e.g.packet filtering,gating,UL/DL rate enforcementUplink Traffic verification(SDF to QoS flow mapping).Transport level packet marking in t
11、he uplink and downlink.Downlink packet buffering and downlink data notification triggering.,5G System Architecture,AMF,SMF,PCF,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,IMS,N3IWF,NSSF,N5,SMSFEIR,NRFUDSF,UDMUDRNEF,n3GPP,All network functions can interact with NRF,UDSF,UDM,UDR,and NEF as necessary,BGW,HSS,TAS,N6,
12、MRF,LMF,7,Nokia 2018,Network Repository Function(NRF),Supports service discovery functionReceive NF Discovery Request from NF instance,and provides the information of the discovered NF instances(be discovered)to the NF instanceMaintains the NF profile of available NF instances and their supported se
13、rvices(e.g.ID,Type,PLMN,Slice,FQDN,capabilities,authorization information,service names)All network functions interact with NRFMultiple NRFs can be deployed in network slicing per PLMN,per group of slices,or slice specificIn roaming cases VPLMN and HPLMN may be used,5G System Architecture,AMF,SMF,PC
14、F,EIR,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,IMS,N3IWF,NSSF,N5,SMSF,NRF,UDSF,UDR,NEF,UDM,n3GPP,All network functions can interact with NRF,UDSF,UDM,UDR,and NEF as necessary,BGW,HSS,TAS,N6,MRF,LMF,8,Nokia 2018,Unstructured Data Storage Function(UDSF),Storage and retrieval of information as unstructured data b
15、y any NF(e.g.context,state,session)All network functions can interact with UDSF(via N18/Nudsf interface)NFs may share a UDSF for storing their respective unstructured data or may each have their own UDSFDeployments can choose to collocate UDSF with UDR,Unstructured Data Storage Function(UDSF),Contex
16、t,State,Session,Any NF,N18/Nudsf,5G System Architecture,AMF,SMF,PCF,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,IMS,N3IWF,NSSF,N5,SMSF,NRF,UDSF,UDMUDRNEF,n3GPP,All network functions can interact with NRF,UDSF,UDM,UDR,and NEF as necessary,BGW,HSS,TAS,N6,MRF,EIRLMF,9,Nokia 2018,Unified Data Repository(UDR),Storage
17、and retrieval of subscription data by the UDM FEStorage and retrieval of policy data by the PCF.Storage and retrieval of structured data for exposure,and application data(including Packet Flow Descriptions(PFDs)for application detection,application request information for multiple UEs),by the NEFDep
18、loyments can choose to collocate UDSF with UDR,Unified Data Repository(UDR),Subscription,Policy,Exposure,Application,NEF FE,Nudr,UDM FEPCF FE5G System Architecture,AMF,SMF,PCF,EIR,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,IMS,N3IWF,NSSF,N5,SMSF,UDR,NEF,NRFUDSFUDM,n3GPP,All network functions can interact with NR
19、F,UDSF,UDM,UDR,and NEF as necessary,BGW,HSS,TAS,N6,MRF,LMF,10,Nokia 2018,Unified Data Management(UDM),3GPP AKA Authentication Credential ProcessingUser Identification HandlingAccess AuthorizationRegistration/Mobility managementSubscription managementSMS managementUDM uses subscription data and authe
20、ntication data that may be stored in UDR,5G System Architecture,AMF,UPF,SMF,PCF,EIR,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,N9,N4,N3IWF,NSSF,N5,N7,N11,N22,SMSF,N20,NRF,UDSF,UDR,NEF,AF,N15,UDM,N12N8N17,n3GPP,All network functions can interact with NRF,UDSF,UDM,UDR,and NEF as necessary,IMSInternet,N6,11,Nokia 2
21、018,Network Exposure Function(NEF),Securely expose the services and capabilities provided by 3GPP network functions for e.g 3rd party,internal exposure/re-exposure,Application Functions,Edge ComputingProvides a means for the Application Functions to securely provide information to 3GPP network,e.g.M
22、obility Pattern,communication patternAuthenticate,authorize and throttle the Application FunctionsTranslation information between AF and internal network functionReceives information from other network functions(based on exposed capabilities of other network functions)May implement a Front End(NEF F
23、E)to store the received information as structured data using a standardized interface to a Unified Data Repository(UDR).The stored information can be accessed and re-exposed by the NEF to other network functions and Application Functions,and used for other purposes such as analytics.,5G System Archi
24、tecture,AMF,SMF,PCF,EIR,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,IMS,N3IWF,NSSF,N5,SMSF,NRF,UDSF,UDR,NEF,UDM,n3GPP,All network functions can interact with NRF,UDSF,UDM,UDR,and NEF as necessary,BGW,HSS,TAS,N6,MRF,LMF,12,Nokia 2018,Network Slice Selection Function(NSSF),Selecting the set of network slice instanc
25、es serving the UEDetermining the Allowed NSSAIDetermining the AMF Set to be used to serve the UE,or,based on configuration,a list of candidate AMF(s),possibly by querying the NRF.,5G System Architecture,AMF,SMF,PCF,EIR,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,IMS,N3IWF,NSSF,N5,SMSF,NRF,UDSF,UDR,NEF,UDM,n3GPP,A
26、ll network functions can interact with NRF,UDSF,UDM,UDR,and NEF as necessary,BGW,HSS,TAS,N6,MRF,LMF,13,Nokia 2018,Authentication Server Function(AUSF),Supports Authentication Server Function(AUSF)as specified by SA WG3,5G System Architecture,AMF,SMF,PCF,EIR,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,IMS,N3IWF,NS
27、SF,N5,SMSF,NRF,UDSF,UDR,NEF,UDM,n3GPP,All network functions can interact with NRF,UDSF,UDM,UDR,and NEF as necessary,BGW,HSS,TAS,N6,MRF,LMF,14,Nokia 2018,Policy Control Function(PCF),Supports unified policy framework to govern network behaviorProvides policy rules to Control Plane function(s)to enfor
28、ce themImplements a Front End(PCF FE)to access subscription information relevant for policy decisions in a Unified Data Repository(UDR),5G System Architecture,AMF,SMF,PCF,EIR,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,IMS,N3IWF,NSSF,N5,SMSF,NRF,UDSF,UDR,NEF,UDM,n3GPP,All network functions can interact with NRF,U
29、DSF,UDM,UDR,and NEF as necessary,BGW,HSS,TAS,N6,MRF,LMF,15,Nokia 2018,Non-3GPP InterWorking Function(N3IWF),UE IPSEC/IKE tunnel terminationTermination of N2 and N3 interfaces to 5G Core Network for Control-Plane and user-plane respectivelyRelaying uplink and downlink control-plane NAS(N1)signaling b
30、etween the UE and AMFHandling of N2 signaling from SMF(relayed by AMF)related to PDU sessions and QoSEstablishment of IPsec Security Association(IPsec SA)to support PDU Session trafficRelaying uplink and downlink user-plane packets between the UE and UPF.(De-capsulation/Encapsulation of packets for
31、IPSec and N3 tunneling)Enforcing QoS corresponding to N3 packet marking,taking into account QoS requirements associated to such marking received over N2N3 user-plane packet marking in the uplink.Local mobility anchor within untrusted non-3GPP accessnetworks using MOBIKESupporting AMF selection,5G Sy
32、stem Architecture,AMF,SMF,PCF,EIR,AUSF,UE,N1,N2,N3,UPF,4G/5G,N4,IMS,N3IWF,NSSF,N5,SMSF,NRF,UDSF,UDR,NEF,UDM,n3GPP,All network functions can interact with NRF,UDSF,UDM,UDR,and NEF as necessary,BGW,HSS,TAS,N6,MRF,LMF,16,Nokia 2018,2.5G核心网关键技术介绍,Nokia 2018,基于服务的构架SBA,Nokia 2018,Technology behind:Modula
33、rity and SBA,19,Nokia 2018,Control PlaneAn NF service is one type of capabilityNF Service ProducerAuthorized NF Service ConsumerNetwork Function may expose one or more NF servicesthrough a service-based interface,two mechanismsRequest-response“Subscribe-Notify,Network Function Service Framework,20,N
34、okia 2018,SBA requires service framework and identification of services,21,Nokia 2018,Uniform solution for all 5G Service-Based InterfacesSBA protocol:HTTP/2Transport:TCPSerialization protocol:JSONThe OpenAPI 3.0.0 is adopted as the Interface Definition LanguageAPI design style:RESTful APIs whenever
35、 possible,complemented by custom methods for service operations that cannot be designed as CRUD operations,22,Nokia 2018,SBA protocol solution,Nokia 2018,控制面和用户面分离CUPS,Technology behind:CP UP Separation,Centralized CP and BUSstructureDistributed UPUPF selection and re-selectionClose to UE(Edge)ULCLB
36、ranching-point,24,Nokia 2018,selective traffic routing,25,Nokia 2018,IPv4,IPv6&Ethernet PDUsTransparent to UEexist more than one UPFbut one UL CL is connected to RANClassification rules provided in run time by SMFClassifies based on target characteristics of the flows,Uplink Classifier(UL-CL),26,Nok
37、ia 2018,multi PDU Session Anchorwith multiple IPv6 prefixes.branch out at a Branching Point UPFforwarding UL traffic towards different PDU Session Anchors and merge DL traffic to UEThe use of multiple IPv6 prefixes:a Branching Pointspread UL traffic based on Source Prefixto support make-before-break
38、 servicecontinuity SSC mode 3to support UE access both local service and central service,Usage of IPv6 multi-homing PDU Session,27,Nokia 2018,Nokia 2018,计算与存储分离,5G Data Storage architectures,Allows any control plane NF to store and retrieve its unstructured data(session state)into/from a UDSF(Unstru
39、ctured Data Storage Network Function)UDSF belongs to the same PLMN where theNF is locatedCP NFs may share a UDSF or may each have its own UDSF5G phase 1 specifies AMF procedures if UE context is stored in UDSFN18/Nudsf:Protocol will not be specified in Rel.15,Unstructured Data Storage Function(UDSF)
40、,Unified Data Repository(UDR),Allows the UDM,PCF,NEF to store data in the UDR(Unified Data Repository)UDR can be deployed in each PLMN.There can be multiple UDRs deployed in a network each accommodating different data sets/subsets.Deployments where a UDR serves a single NF and stores its data and th
41、us can be integrated with this NF,can be possible,e.g.a UDM with build-in UDRData exposed via Nudr(subscription,policy,structured data for exposure,application request information for multiple UEs)shall be standardized.In addition it shall be possible to access operator specific data sets/data not s
42、tandardized.The organization of the data stored in UDR shall not be standardizedNudr:service based interface http2 based.Nudr is always intra-PLMN,Nudm is inter-PLMN in roaming,N18/Nudsf,Any NF,UDSF,Subscription Data,Policy Data,Structured Data for exposure,Application Data,UDR,UDM FE,PCF FE,NEF FE,
43、Nudr,29,Nokia 2018,Technology behind:Compute Storage Separation,stateless NFV,30,Nokia 2018,Nokia 2018,网络切片构架和选择NSSF,Network Slice Identification,SSAI identifies a Network Slice,comprised of:A Slice/Service type(SST),refers to the expected Network Slice behaviour in terms of features and services;A
44、Slice Differentiator(SD),optional to differentiate multiple Network Slices of the same Slice/Service type.can have standard values or non-standard valuesThe NSSAI is a collection of S-NSSAIs.a Network Slice instance can be associated with one or more S-NSSAIs,and an S-NSSAI can be associated with on
45、e or more Network Slice instances.,32,Nokia 2018,Slice Examples in 5GC&5G RAN,eMBB,UPF,SMF,UPF,SMF,eMBB,CONTROL PLANE USER PLANE,AMF,UPF,SMF,eMTC,SHARED,DEDICATED,SLICE#1,SLICE#2,SLICE#3,AMF,RRC/P,DCP,N2,MAC,PHY,SDAPPDCP,SDAPPDCP,RRC/P,DCP,N2,SDAP,UE 1,UE 2,5G(R)AN,N1(SST#1,SD#A),N1(SST#1,SD#B;SST#2
46、,SD#B),N2,N2,N3,N3,N3,SHARED,DEDICATED,PDCP,S-NSSAI#1,S-NSSAI#2,UE 1 NSSAI,SST#1,S-NSSAI#1,UE 2 NSSAI,SD#A,SST#1:eMBB Service Slice SST#2:eMTC Service Slice SD#A:Enterprise ASD#B:Enterprise B,Enterprise A,Enterprise B,Enterprise B,RRC(SST#1,SD#A),RRC(SST#1,SD#B;SST#2,SD#B),RAN Slice Selection Functi
47、on,33,Nokia 2018,5G Network Architecture for Network Slicing,Slice Specific Network Functions,N3,DN,N2,N1,N5N7/N10/N11,N4,NG-SMF,N6,(*)Could be left up to operator decision,NEF,Slice Common Network Functions,UDM,AMF,AUSFPCF,(*),(*),(*),NSSF,UE,NG-RAN,Shared resources,34,Nokia 2018,Dedicated resource
48、s,Slicing privacy not included in Rel.15,Independent CP and UPPartially-shared CPFully-shared CP,35,Nokia 2018,Different Network Slice Deployment scheme,comprises two steps:performing a RM procedure to select an AMF that supports the required Network Slices.establishing one or more PDU Session to th
49、e required Data network via the Network Slice Instance(s).,36,Nokia 2018,Network Slices Selection,UE Registration,Configured NSSAI provisioned to UE and NS Selection Policy(NSSP):Rules associating an App with an S-NSSAI and DNN linked to the AppUE sends Reg.Req.including Requested NSSAI.RAN selects
50、AMF based on Requested NSSAI(assumption 5G-GUTI is not provided)AMF fetches subscription data from UDM.UDM returns(Sub data+Subscribed NSSAI)AMF interrogates NSSF for Slice Selection if it cannot serve the UE:NSSF returns set of NSI ID,Allowed S-NSSAI,target AMF set.A target AMF is selected by the A
