5g核心网和关键技术和功能介绍-nokia

Access and Mobility Management function (AMF)?Mandatory functionality?Termination of RAN control interface (N2)?Termination of NAS (N1), NAS ciphering and integrity protection?Access authentication and authorization?Security anchor function and security context mgmt for access security key handling ?Registration, connection, reachability, and mobility management?Session mgmt message transport and proxy between UE and Session Management Function (SMF)?SMS transport between UE and SMSF?Lawful interception?Optional functionality?Support of mandatory functionality for non-3GPP access?N3IWF N2 interface termination and NAS signaling5? Nokia 20185G System ArchitectureNRFUDSFUDMUDRNEFAFNSSFAUSFSMSFEIRLMFHSSTASN1AMFSMFPCFN5IMSMRFN2N4BGWIMS4G/5GUPFInternetUEn3GPPN3IWFN3N6All network functions can interact with NRF, UDSF, UDM, UDR, and NEF as necessarySession Management function (SMF)?Session establishment, modify and release incN3 tunnel?UE IP address allocation & management?Selection and control of UP function (UPF)?UPF traffic steering configuration to proper destination?Termination of interfaces towards Policy control functions?Control part of policy enforcement and QoS?Charging data collection and support of charging interfaces?Control and coordination of charging data collection at UPF?Termination of SM parts of NAS messages?Downlink Data Notification?Initiator of AN specific SM information via AMF over N2?Determine SSC mode of a session?Lawful intercept?Roamingfunctionality (local QoS, charging, LI)6? Nokia 20185G System ArchitectureNRFUDSFUDMUDRNEFAFNSSFAUSFSMSFEIRLMFHSSTASN1AMFSMFPCFN5IMSMRFN2N4BGWIMS4G/5GUPFInternetUEn3GPPN3IWFN3N6All network functions can interact with NRF, UDSF, UDM, UDR, and NEF as necessaryUser plane function (UPF)?Anchor point for Intra-/Inter-RAT mobility (when applicable)?External PDU session point of interconnect to Data Network?Packet routing & forwarding?Packet inspection and User plane part of Policy rule enforcement?Lawful intercept (UP collection)?Traffic usage reporting.?Uplink classifier to support routing traffic flows to a data network.?Branching point to support multi-homed PDU session.?QoShandling for user plane, e.g. packet filtering, gating, UL/DL rate enforcement?Uplink Traffic verification (SDF to QoSflow mapping).?Transport level packet marking in the uplink and downlink.?Downlink packet buffering and downlink data notification triggering.7? Nokia 20185G System ArchitectureNRFUDSFUDMUDRNEFAFNSSFAUSFSMSFEIRLMFHSSTASN1AMFSMFPCFN5IMSMRFN2N4BGWIMS4G/5GUPFInternetUEn3GPPN3IWFN3N6All network functions can interact with NRF, UDSF, UDM, UDR, and NEF as necessaryNetwork Repository Function (NRF)?Supports service discovery function?Receive NF Discovery Request from NF instance, and provides the information of the discovered NF instances (be discovered) to the NF instance?Maintains the NF profile of available NF instances and their supported services (e.g. ID, Type, PLMN, Slice, FQDN, capabilities, authorization information, service names)?All network functions interact with NRF?Multiple NRFs can be deployed in network slicing per PLMN, per group of slices, or slice specific?In roaming cases VPLMN and HPLMN may be used8? Nokia 20185G System ArchitectureNRFUDSFUDMUDRNEFAFNSSFAUSFSMSFEIRLMFHSSTASN1AMFSMFPCFN5IMSMRFN2N4BGWIMS4G/5GUPFInternetUEn3GPPN3IWFN3N6All network functions can interact with NRF, UDSF, UDM, UDR, and NEF as necessaryUnstructured Data Storage Function (UDSF)?Storage and retrieval of information as unstructured data by any NF (e.g. context, state, session)?All network functions can interact with UDSF (via N18/Nudsfinterface)?NFs may share a UDSF for storing their respective unstructured data or may each have their own UDSF ?Deployments can choose to collocate UDSF with UDR9? Nokia 2018Unstructured Data Storage Function (UDSF)ContextStateSessionN18/NudsfAnyNF5G System ArchitectureNRFUDSFUDMUDRNEFAFNSSFAUSFSMSFEIRLMFHSSTASN1AMFSMFPCFN5IMSMRFN2N4BGWIMS4G/5GUPFInternetUEn3GPPN3IWFN3N6All network functions can interact with NRF, UDSF, UDM, UDR, and NEF as necessary