In one implementation of block 301, the network device may indicate the dynamic scheduling information of the RACH resources by indicating whether the RACH resources are available. That is, in the implementation, the network device may explicitly or implicitly indicate whether the RACH resources are available via the control signaling, thereby indicating the dynamic scheduling information of the RACH resources, namely, indicating whether the UE needs to autonomously select RACH resources other than unavailable resources in the above set of RACH resources.

In an example of the implementation, whether the RACH resources are available may be implicitly indicated via a transmission configuration. The transmission configuration, for example, may contain transmission direction information, via which transmission directions of the time-domain positions of the RACH resources being indicated. With the transmission direction information, the network device may implicitly inform the UE of whether an RACH resource at a time-domain position is available. The embodiment is not limited thereto, and in an example, whether the RACH resources are available may also be implicitly indicated via other indication information in the transmission configuration.

In this example, a transmission direction may be indicated via a control signaling format, control signaling presence, and a control signaling content, etc., that is, the transmission direction information may be a control signaling format, control signaling presence, and a control signaling content, etc.