Methods and apparatuses are provided for transmitting a status report by a receiving device in a mobile communication system. A first layer, supporting an ARQ, receives a packet from a transmitting device through a second layer lower than the first layer. The first layer, supporting the ARQ, determines whether the status report is triggered based on at least one triggering condition. If the status report is triggered, based on information representative of a transmission from the second layer, the first layer, supporting the ARQ, constructs a status packet reporting a status of the received packet. The status packet is transmitted to the transmitting device.