It is presented a method for managing a sequence number (SN) range for radio link control (RLC) entities in a radio access network (5) during an on-going connection. The method is performed in a transmitting node (4) of the radio access network and comprises the steps of: monitoring (60) send state variables for a transmission window; determining (61) to change the SN range based on the send state variables; and transmitting (62) a control message when the SN range is determined to change. It is also presented a transmitting node, a receiving node, a method performed in a receiving node, a computer program and a computer program product.