Solutions are proposed to handle PRACH resource and beam selection under the following scenarios. First, a CFRA procedure is initiated, but all beams associated with the CFRA resource is below a RSRP threshold and CBRA fallback is not supported. UE continues to perform CFRA by selecting any downlink beam associated with dedicated PRACH resource, and then select dedicated PRACH resource associated with the selected downlink beam; second, a CFRA procedure is initiated but the active UL BWP is not paired with the active DL BWP. Upon CFRA initiation, UE uses current active UL and DL BWP to perform CFRA, and switches to another BWP pair upon all beams associated with the CFRA resource are below a RSRP threshold; third, a CBRA procedure is initiated but the active UL BWP is not configured with PRACH resource. UE selects a special UL/DL BWP to perform the CBRA procedure.