A method of a user equipment, UE, for performing unified access control, the method comprising: - receiving system information including information for access control from a base station; - when an access attempt is triggered, providing access category information from an non-access stratum, NAS, layer of the UE to an access stratum, AS, layer, said access category information being set for each access attempt type that is classified based on an application service type of the UE or a transmission signaling processing procedure; - checking whether access barring parameter information is included in the system information and determining, based on at least one UE configuration information set for the UE and said access category information, whether to perform an access barring check operation, wherein the access barring parameter information is set in association with both said at least one UE configuration information and said access category information; and - controlling the access barring check operation in the AS layer using at least one of the access category information and the access barring parameter information set in association with both said at least one UE configuration information and said access category information, wherein the access barring parameter information includes barring bitmap information according to UE configuration information, the bitmap information being used to determine whether the UE skips the access barring check operation, the access barring parameter information being distinguished through a barring identification, barring ID, wherein, when said barring bitmap information according to UE configuration information is set as at least one of access classes 11, 12, 13, 14 and 15, the controlling of the access barring check operation is performed such that the access barring check operation is skipped for said access attempt, wherein the access category information includes an access category mapped to specific network slice selection assistance information, NSSAI, and wherein the access category information further includes an access category for an RAN notification area, RNA, update procedure initiation in a RRC inactive state. - receiving system information including information for access control from a base station; - when an access attempt is triggered, providing access category information from an non-access stratum, NAS, layer of the UE to an access stratum, AS, layer, said access category information being set for each access attempt type that is classified based on an application service type of the UE or a transmission signaling processing procedure; - checking whether access barring parameter information is included in the system information and determining, based on at least one UE configuration information set for the UE and said access category information, whether to perform an access barring check operation, wherein the access barring parameter information is set in association with both said at least one UE configuration information and said access category information; and - controlling the access barring check operation in the AS layer using at least one of the access category information and the access barring parameter information set in association with both said at least one UE configuration information and said access category information, wherein the access barring parameter information includes barring bitmap information according to UE configuration information, the bitmap information being used to determine whether the UE skips the access barring check operation, the access barring parameter information being distinguished through a barring identification, barring ID, wherein, when said barring bitmap information according to UE configuration information is set as at least one of access classes 11, 12, 13, 14 and 15, the controlling of the access barring check operation is performed such that the access barring check operation is skipped for said access attempt, wherein the access category information includes an access category mapped to specific network slice selection assistance information, NSSAI, and wherein the access category information further includes an access category for an RAN notification area, RNA, update procedure initiation in a RRC inactive state.