In another implementation of block 301, the network device indicates the dynamic scheduling information of the RACH resources by indicating the available RACH resources. That is, in an implementation, the network device may explicitly or implicitly indicate the available RACH resources via the control signaling, thereby indicating the dynamic scheduling information of the RACH resources.

In the implementation, the network device may, via the control signaling, indicate RACH resources that should be used by the UE to be randomly accessed (assigned RACH resources). For example, the network device may inform (explicitly indicate) the UE of the assigned RACH resources via the control signaling. For another example, the network device may indicate (implicitly indicate) the available RACH resources according to correspondences between RACH resources and preambles by using the control signaling and indicating preambles matched with RACH resources, that is, the available RACH resources are implicitly indicated by the dynamic configuration information of the preambles. For a further example, the network device may indicate the available RACH resources by indicating whether preambles and data are permitted to be transmitted in a random access request.