A method for accessing a Core Network, CN, of hierarchical deployment, the method comprising: acquiring, by an Evolved NodeB, eNB, a load of a CN by end-to-end detection, or by being notified by the CN of the load, wherein the CN comprises a local CN and a global CN deployed hierarchically, wherein the local CN is geographically closer to the eNB than the global CN to cover a specific area, wherein the global CN is constructed and operated in a localized manner, wherein the local CN is deployed in the specific area which comprises at least one of a crowded area or an area with a dense collection of equipment of Internet of Things, wherein the specific area covered by the local CN is covered simultaneously by the global CN, wherein the eNB is in the specific area and is connected to both the local CN and the global CN; at an initial access by User Equipment, UE, selecting, by the eNB, the local CN or the global CN for the UE according to a policy, wherein the policy comprises: both an attribute of the UE and the load of the CN; and allowing, by the eNB, the UE to access the local CN or the global CN that has been selected, wherein the eNB acquires the attribute of the UE in access signaling sent by the UE, wherein the attribute of the UE comprises at least one of: UE of Internet of Things, UE of Internet of Vehicles, and UE of low mobility, wherein the selecting, by the eNB, the local CN or the global CN for the UE according to the policy comprises at least one of: prioritizing the UE of Internet of Things to be admitted into the local CN; prioritizing the UE of Internet of Vehicles to be admitted into the global CN; or prioritizing the UE of low mobility to be admitted into the local CN. acquiring, by an Evolved NodeB, eNB, a load of a CN by end-to-end detection, or by being notified by the CN of the load, wherein the CN comprises a local CN and a global CN deployed hierarchically, wherein the local CN is geographically closer to the eNB than the global CN to cover a specific area, wherein the global CN is constructed and operated in a localized manner, wherein the local CN is deployed in the specific area which comprises at least one of a crowded area or an area with a dense collection of equipment of Internet of Things, wherein the specific area covered by the local CN is covered simultaneously by the global CN, wherein the eNB is in the specific area and is connected to both the local CN and the global CN; at an initial access by User Equipment, UE, selecting, by the eNB, the local CN or the global CN for the UE according to a policy, wherein the policy comprises: both an attribute of the UE and the load of the CN; and allowing, by the eNB, the UE to access the local CN or the global CN that has been selected, wherein the eNB acquires the attribute of the UE in access signaling sent by the UE, wherein the attribute of the UE comprises at least one of: UE of Internet of Things, UE of Internet of Vehicles, and UE of low mobility, wherein the selecting, by the eNB, the local CN or the global CN for the UE according to the policy comprises at least one of: prioritizing the UE of Internet of Things to be admitted into the local CN; prioritizing the UE of Internet of Vehicles to be admitted into the global CN; or prioritizing the UE of low mobility to be admitted into the local CN. prioritizing the UE of Internet of Things to be admitted into the local CN; prioritizing the UE of Internet of Vehicles to be admitted into the global CN; or prioritizing the UE of low mobility to be admitted into the local CN.