A user equipment (UE) configured with an uplink (UL) split bearer and method for packet data convergence protocol (PDCP) control protocol data unit (PDU) transmission by the UE are provided. The method includes triggering, by the UE, a PDCP control PDU; determining, by the UE, whether a UL grant is available for a master evolved node B (eNB); transmitting, by the UE, the PDCP control PDU on a link associated with the master eNB, if the UL grant is available for the master eNB; and transmitting, by the UE, the PDCP control PDU on a link associated with a secondary eNB, when the UL grant is unavailable for the master eNB.