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5g core interfaces

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The 5G (Fifth Generation) mobile network architecture consists of two main components: the Radio Access Network (RAN) and the 5G Core (5GC). The 5GC is responsible for managing the core network functions and services. The communication between different elements in the 5G Core is facilitated through various interfaces. Here are some of the key 5G Core interfaces:

  1. N1 Interface (UE Radio Access Capability Information Exchange):
    • Description: This interface is between the User Equipment (UE) and the Access and Mobility Management Function (AMF).
    • Purpose: It is used for the exchange of information related to the radio access capabilities of the UE.
  2. N2 Interface (UE Radio Access Bearer Setup):
    • Description: This interface connects the AMF with the Session Management Function (SMF).
    • Purpose: It is used for the setup and modification of Radio Access Bearers (RABs) based on the service requirements.
  3. N3 Interface (UE Mobility):
    • Description: This interface connects the AMF with the Mobility Management Function (MMF).
    • Purpose: It is used for managing the mobility of UEs, including handovers between different cells or even between different Radio Access Technologies (RATs).
  4. N4 Interface (UE Policy Control):
    • Description: The interface between the SMF and the Policy Control Function (PCF).
    • Purpose: It is used for policy control and flow-based charging for user plane data.
  5. N6 Interface (UE Authentication):
    • Description: This interface connects the AMF with the Authentication Server Function (AUSF).
    • Purpose: It is used for authenticating the UE and establishing secure connections.
  6. N9 Interface (UE Registration):
    • Description: This interface connects the AMF with the Unified Data Management (UDM) function.
    • Purpose: It is used for the registration of UEs in the network and management of user subscription information.
  7. N11 Interface (UE Non-3GPP Interworking):
    • Description: This interface connects the AMF with the Non-3GPP Interworking Function (N3IWF).
    • Purpose: It is used for interworking between 3GPP and non-3GPP access networks, enabling communication with non-3GPP radio systems.