reselect RACH resources when it is no, to determine available RACH resources.

In an embodiment, the control signaling indicates the dynamic scheduling information of the RACH resources by indicating whether the selected RACH resources are available or by indicating the available RACH resources.

In an embodiment, the processor 1901 may be configured to:

select other RACH resources than unavailable RACH resources from a set of RACH resources configured by the network device, or

select available RACH resources indicated by the network device via the control signaling as the available RACH resources.

In another implementation, the uplink transmission control apparatus 1700 and the processor 1901 may be configured separately. For example, the uplink transmission control apparatus 1700 may be configured as a chip connected to the processor 1901, with its functions being realized under control of the processor 1901.

As shown in FIG. 19, the UE 1900 may further include a communication module 1903, an input unit 1904, a display 1905, and a power supply 1906. It should be noted that the UE 1900 does not necessarily include all the parts shown in FIG. 19, and furthermore, the UE 1900 may include parts not shown in FIG. 19, and the related art may be referred to.