A method in a first node of a telecommunications network, in which a Radio Link Control (RLC) controller detects a failure to transmit a first RLC data Protocol Data Unit (PDU) containing all or part of a Service Data Unit (SDU) towards a second node of the telecommunications network, and notifies a Radio Access Control (RAC) controller of the failure. The RAC controller, in response to receiving a dedicated control channel (DCCH) message from the second node subsequent to the notification, instructs the RLC controller to retransmit the SDU. In response to the instruction, the RLC controller transmits a second RLC data PDU containing the SDU or a part of the SDU towards the second node. The RLC controller, in further response to the instruction, transmits a receipt of delivery to the RAC controller when reception of all parts of the SDU has been positively acknowledged by the second node.