block 1201: the UE monitors control signaling corresponding to selected RACH resources before using the selected RACH resources; and

block 1202: the UE determines available RACH resources according a result of monitoring the control signaling.

In an embodiment, a network device explicitly or implicitly indicates dynamic scheduling information of the RACH resources via the above control signaling, a manner of indicating being as described in Embodiment 1, and being not going to be described herein any further.

In an embodiment, a UE to be randomly accessed may select RACH resources in a set of RACH resources preconfigured by the network device. Here, reference may be made to Embodiment 1 for a manner for preconfiguring the set of RACH resources and contents thereof, which shall not be described herein any further.

In block 1201, the UE may determine according to indication or configuration of a base station whether it needs to monitor the control signaling; if it is determined that it needs not to monitor the control signaling, the UE may deem that the selected RACH resources are available, and transmit a random access request matched with the RACH resources by directly using the RACH resources; and if it is determined that it needs to monitor the control signaling, the UE may monitor the control signaling corresponding to the selected RACH resources before using the selected RACH resources, and determine the available RACH resources according to the result of monitoring the control signaling.

In block 1202, as the network device explicitly or implicitly indicates the dynamic scheduling information of the RACH resources via the above control signaling, the UE may determine the available RACH resources according to the result of monitoring the control signaling.