HIERARCHICAL NETWORK REGISTRATION METHOD, APPARATUS, AND SYSTEM

Embodiments of the present invention disclose a hierarchical network registration method. The method is applied to a hierarchical network formed by a terrestrial network and at least one layer of an air network, and the method includes: obtaining, by a radio network node, a registration result of an air network node, where the radio network node is located in the terrestrial network; the air network node is located in the air network, and covers the radio network node; and the registration result includes attribute information and beam information of the air network node; and broadcasting, by the radio network node, the registration result to a mobile user covered by the radio network node. The air network in the method of the present invention may be a satellite network, and the hierarchical network is a hierarchical network formed by the satellite network and the terrestrial radio network.