Network node, method therein, computer program, and carrier comprising the computer program for retransmitting an RLC PDU

A non-transitory computer readable recording medium storing a computer program product for controlling a network node for retransmitting a Radio Link Control (RLC) Protocol Data Unit (PDU) to a User Equipment (UE), wherein the UE and the network node operate in a wireless communications network, and wherein the UE is configured to use Discontinuous Reception (DRX), the computer program product comprising software instructions which, when run on processing circuitry of the network node, causes the network node to:

• in response to an RLC PDU transmitted to the UE being indicated as not being received by the UE, determine a time until a first DRX on-duration time period that is possible to allow time for Hybrid Automatic Repeat Request (HARM) operations to complete a retransmission of a Medium Access Control (MAC) PDU, which MAC PDU is associated with the RLC PDU;
• and
• initiate a retransmission of the RLC PDU to the UE based on expiration of a timer, wherein the timer is set up according to the determined time.