In an embodiment, in order to support the random access of the UE, the network device may preconfigure a set of RACH resources and/or a set of preambles, such as statically or semi-statically configuring the set of RACH resources and/or the set of preambles via broadcast signals and/or broadcast channels and/or other channels; wherein, the broadcast signals may be synchronization signals, such as a primary synchronization signal (PSS) and/or a secondary synchronization signal (SSS), a new radio primary synchronization signal (NR-PSS) and/or a new radio secondary synchronization signal (NR-SSS); the broadcast channels may be, for example, a physical broadcast channel (PBCH), a new radio physical broadcast channel (NR-PBCH), a new radio physical broadcast channel 1 (NR-PBCH_1), and a new radio physical broadcast channel 2 (NR-PBCH_2), etc.; and other channels may be, for example, a physical downlink shared channel (PDSCH), and a new radio physical downlink shared channel (NR-PDSCH), etc.; however, the embodiment is not limited thereto. In an embodiment, there may exist a fixed mapping relationship between the above preambles (or the set of preambles) and the RACH resources (or the set of RACH resources), and when the network device configures only the preambles (or the set of preambles), RACH resources (or the set of RACH resources) to which they correspond are implicitly configured by default.

In an embodiment, the network device may configure RACH resources of a single type at the same time-domain position, and may also configure RACH resources of a plurality of types at the same time-domain position. And different types of RACH resources may occupy different time lengths and/or frequency-domain widths and/or numbers of subcarriers, may employ different numerologies, or may be used for transmitting different preambles, or may be used for transmitting different preambles and data, such an a UE_ID, etc.