Apparatus and method for supporting access to private mobile communication network and carrier mobile communication network

Abstract

The disclosure provides a method of registering a user equipment (UE) at a second network via a first network, the method including: receiving, from the UE, a registration request message including at least one of first network identification (ID) information, ID information of the UE in the first network, second network ID information, and ID information of the UE in the second network; selecting an authentication server function (AUSF) of the first network which is configured to perform a first authentication procedure of service subscription authentication for the UE in the first network; performing the first authentication procedure with the AUSF of the first network and unified data management (UDM) of the first network; determining, based on a result of the first authentication procedure, whether to perform a second authentication procedure of service subscription authentication for the UE in the second network; performing, based on a result of the determining, the second authentication procedure with an AUSF of the second network and UDM of the second network; and transmitting, to the UE, a registration acceptance message including information of at least one of the result of the first authentication procedure and a result of the second authentication procedure.