An access and mobility management function (AMF) of a 5G core network configured to transmit a network function registration request to a network resource function (NRF), receiving a response to the network function registration request from the NRF, transmit a network function discovery request to the NRF, the network function discovery request including one or more single network slice selection assistance information (S-NSSAI) and an indication that the discovery request is for a network slice admission control function (NSACF) and receive a network function discovery response from the NRF, wherein the network function discovery response includes a NSACF address.