receiving, by a UE communicating in DC with an MN and an SN, a handover command directly from the MN including a first time value for a first timer for performing a first random access procedure with the MN and a second time value for a second timer for performing a second random access procedure with the SN, and including a configuration message which configures [d] the UE to connect to a primary cell (PCell) in the MN and a primary second cell (PSCell) in the SN;

starting, by the UE, the first timer and the second timer;

performing, by the UE, the first random access procedure with the PCell in the MN;

performing, by the UE, the second random access procedure with the PSCell in the SN;

stopping, by the UE, the second timer in response to completing the second random access procedure; and

in response to the first timer expiring before completing the first random access procedure, transmitting, by the UE, a radio resource control (RRC) re-establishment request message to the MN after stopping the second timer in response to completing the second random access procedure.