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    5G NR Basic Architecture, amf functions, UPF functions, smf functions, 5g architecture components, 5g network architecture diagram, 5g ran architecture, 5g architecture, 5g core network architecture, 5g architecture in mobile computing, 5g nsa architecture

    5G Architecture 3gpp:


    An NG-RAN node is either:
    -  a gNB, presenting NR user plane and control plane protocol terminations in the direction of the UE
    -  an ng-eNB, providing E-UTRA user plane and control plane protocol terminations in the direction of the UE.
    The gNBs and new generation [ng-eNBs] are inter-connected with each other by using the Xn interface. The gNBs and [ng-eNBs] are additionally connected by the NG interfaces to the 5GC, more specially to the AMF (Access and Mobility Management Function) with the aid of the NG-C interface and to the UPF (User Plane Function) by way of the NG-U interface.
    NOTE: The architecture and the F1 interface for a functional split are described.
    The New Generation-(RAN) architecture is defined in Figure above.

    Functional Split:The gNB and ng-eNB host the following functions:

    - Function for Radio Resource Management [RRM]: Radio Bearer Control [RBC], Radio Admission Control [RAC], Connection
    Mobility Control, Dynamic allocation of sources to UEs in each uplink and downlink (scheduling);
    IP header compression, encryption and integrity protection facts;
    - Selection of an Access Mobility Function at UE attachment while no routing to an AMF may be determined from the statistics supplied by using the UE;
    - Routing of User Plane statistics closer to UPF(s);
    - Routing of Control Plane statistics toward AMF;
    - Connection setup and release;
    - Scheduling and transmission of paging messages;
    - Scheduling and transmission of device broadcast facts (originated from the AMF or OAM);
    - Measurement and dimension reporting configuration for mobility and scheduling;
    - Transport level packet marking inside the uplink;
    - Session Management;
    - Support of Network Slicing;
    - QoS Flow management and mapping to statistics radio bearers;
    - Support of UEs in RRC_INACTIVE state;
    - Distribution feature for NAS messages;
    - Radio access community sharing;
    - Dual Connectivity;
    - Tight interworking between NR and E-UTRA.

    The AMF hosts the subsequent essential functions:

    - NAS signalling termination;
    - NAS signalling security;
    - AS Security manipulate;
    - Inter CN node signalling for mobility among 3GPP access networks;
    - Idle mode UE Reachability (including manage and execution of paging retransmission);
    - Registration Area management;
    - Support of intra-machine and inter-system mobility;
    - Access Authentication;
    - Access Authorization including take a look at of roaming rights;
    - Mobility management manage (subscription and policies);
    - Support of Network Slicing;
    - SMF selection.

    The UPF hosts the following principal functions:

    - Anchor factor for Intra-/Inter-RAT mobility;
    - External PDU session factor of interconnect to Data Network;
    - Packet routing & forwarding;
    - Traffic usage reporting;
    - Uplink classifier to guide routing site visitors flows to a data network;
    - Branching factor to assist multi-homed PDU session;
    - QoS coping with for user plane, e.G. Packet filtering, gating, UL/DL fee enforcement;
    - Uplink Traffic verification (SDF to QoS float mapping);
    - Downlink packet buffering and downlink facts notification triggering.

    The Session Management function (SMF) hosts the following major functions:

    - Session Management;
    - UE IP cope with allocation and management;
    - Selection and control of UP function;
    - Configures traffic guidance at UPF to route visitors to right destination;
    - Control a part of policy enforcement and QoS;
    - Downlink Data Notification.
    This is summarized at the figure below wherein yellow bins depict the logical nodes and white packing containers depict the fundamental functions.


    Joni Tyagi

    Author & Editor