A network control device (130;230;330;830;835), comprising: a controller (112;232), providing a plurality of signaling entities each belonging to one of a plurality of signaling levels to form multi-level signaling entities and configuring one or more signaling entities of the multi-level signaling entities to a communications apparatus (110;310) to communicate with the communications apparatus (110;310) based on the one or more configured signaling entities; and a wireless communications module, transmitting a plurality of radio frequency signals via the one or more configured signaling entities, wherein the signaling entities are the transmission beams (802-1∼802-3;803-1∼803-7) utilized for beamforming, and the signaling entities in different signaling levels are the transmission beams (802-1∼802-3;803-1∼803-7) with different beam widths, characterized by the communications apparatus (110;310) being adapted to enter a wireless communications protocol by first affixing to at least one signaling entity provided by the network control device (130;230;330;830;835) in an entry signaling level so as to utilize one or more service(s) provided by the at least one signaling entity; and the signaling entities (401; 402-405; 406) in different signaling levels forming a hierarchical, tree-like structure, in which a first signaling entity having a first beam width in one signaling level comprises one or more second signaling entities (402∼405) in a subsequent signaling level having a second beam width being narrower than the first beam width, the first signaling entity being an ancestor of the second signaling entity and the one or more second signaling entities (402∼405) being a descendant of the first signaling entity, respectively, in the hierarchical structure, and the signaling entities in different signaling levels being provided to the communications apparatus (110;310) for it to be capable of camping on or attaching to the network control device (130;230;330;830;835) by affixing to the signaling entities in different signaling levels. a controller (112;232), providing a plurality of signaling entities each belonging to one of a plurality of signaling levels to form multi-level signaling entities and configuring one or more signaling entities of the multi-level signaling entities to a communications apparatus (110;310) to communicate with the communications apparatus (110;310) based on the one or more configured signaling entities; and a wireless communications module, transmitting a plurality of radio frequency signals via the one or more configured signaling entities, wherein the signaling entities are the transmission beams (802-1∼802-3;803-1∼803-7) utilized for beamforming, and the signaling entities in different signaling levels are the transmission beams (802-1∼802-3;803-1∼803-7) with different beam widths, characterized by the communications apparatus (110;310) being adapted to enter a wireless communications protocol by first affixing to at least one signaling entity provided by the network control device (130;230;330;830;835) in an entry signaling level so as to utilize one or more service(s) provided by the at least one signaling entity; and the signaling entities (401; 402-405; 406) in different signaling levels forming a hierarchical, tree-like structure, in which a first signaling entity having a first beam width in one signaling level comprises one or more second signaling entities (402∼405) in a subsequent signaling level having a second beam width being narrower than the first beam width, the first signaling entity being an ancestor of the second signaling entity and the one or more second signaling entities (402∼405) being a descendant of the first signaling entity, respectively, in the hierarchical structure, and the signaling entities in different signaling levels being provided to the communications apparatus (110;310) for it to be capable of camping on or attaching to the network control device (130;230;330;830;835) by affixing to the signaling entities in different signaling levels.