A UE may be configured with master cell group (MCG) and secondary cell group (SCG). Neither MCG nor SCG transmission may be suspended in the UE. The UE may be configured with split SRB1 or SRB3. The UE may detect a failure of a PCell of the MCG (e.g., at B) shown in FIG. 23). Based on detecting the failure of the PCell, the UE may initiate an MCG failure information procedure. The UE may send MCG failure information message to the MCG (e.g., PCell) via the SCG (e.g., PSCell) using the split SRB1 or SRB3. The MCG failure information message may comprise a failure type and measurement results. Based on receiving the MCG failure information message, the SCG (e.g., PSCell) may forward the MCG failure information message to the MCG. Based on receiving the MCG failure information message, the MCG may send an RRC reconfiguration message or RRC release message to the UE via the SCG. Based on receiving the RRC reconfiguration message, the UE may continue the RRC connection without re-establishment.
