Systems and methods for session setup or registration in a core network

A network repository function (NRF) device, comprising:

• one or more processors configured to:
• receive, from a first network function device included in a core network, a first request for discovery of a unified data management (UDM) device included in the core network,
• wherein the first request is based on a subscription permanent identifier (SUPI) associated with a user profile that is associated with a user device;
• transmit, to first network function device and based on the first request, an indication of:
• a UDM group identifier associated with the UDM device, and
• a user data repository (UDR) group identifier associated with a UDR device that is associated with the UDM device;
• and
• receive, from a second network function device included in the core network, a second request for discovery of a UDR device included in the core network,
• wherein the UDR device is associated with the UDM device, and
• wherein the second request is based on the UDR group identifier.

A non-transitory computer-readable medium storing a set of instructions, the set of instructions comprising:

• one or more instructions that, when executed by one or more processors of a first network function device, cause the first network function device to:
• receive, from a second network function device, at least one of:
• an indication of a unified data management (UDM) group identifier associated with a UDM device, and
• an indication of a user data repository (UDR) group identifier associated with a UDR device that is associated with the UDM device;
• and
• transmit, to a network repository function (NRF) device, at least one of:
• a request for discovery of the UDM device based on the UDM group identifier, or
• a request for discovery of the UDR device based on the UDR group identifier.