Network Changes in CORE for 4G Receiving 5G NSA

Hi Experts,

When a 4G network starts to support 5G NSA, besides gNB and TAC configuration, are any changes required in the CORE network?

If possible, could anyone share a document that explains this in detail?

While the core network architecture remains largely the same, there are specific changes and enhancements necessary to support 5G NSA services.

Key EPC Changes for 5G NSA:

  1. MME (Mobility Management Entity):
  • 5G NR Support:

    The MME needs to be upgraded to support 5G NR procedures, including 5G registration, paging, and handovers.

  • NG-RAN Interface:

    The MME must be able to communicate with the gNB (5G NodeB) using the NG-RAN interface.

  • 5GC Integration:

    In some cases, the MME may need to interact with 5GC functions (e.g., SMF, UPF) for certain 5G services.

  1. SGW (Serving Gateway):
  • 5G NR Support:

    The SGW needs to be upgraded to support 5G NR protocols and handle 5G bearer establishment and release.

  • NG-RAN Interface:

    The SGW must be able to communicate with the gNB using the NG-RAN interface.

  1. PGW (Packet Data Network Gateway):
  • 5G NR Support:

    The PGW needs to be able to handle 5G traffic and apply appropriate policies.

  • 5GC Integration:

    The PGW may need to interact with 5GC functions (e.g., SMF, UPF) for certain 5G services.

Additional Considerations:

  • HSS (Home Subscriber Server):

    The HSS needs to store and manage subscriber information related to 5G services, including 5G subscription data and 5G QoS parameters.

  • Diameter Protocol:

    The Diameter protocol needs to be extended to support 5G specific messages and procedures.

  • Security:

    The EPC needs to be enhanced to support 5G security features, such as 5G authentication and key agreement.

The integration of the 5GC is not required for NSA.