A method for transmitting source packets in a communication system, the method comprising: generating a source packet block including the source packets for transmission of a content; generating a repair packet block including repair packets from the generated source packet block by performing forward error correction, FEC, encoding to enable a receiver to restore a source packet of the source packet block lost during transmission by performing FEC decoding; and transmitting a packet stream including the repair packets of the repair packet block, and the source packets of the source packet block and a packet for a signaling message including packet identification, Packet ID, values for the source packet block, wherein a repair FEC payload identification, ID, included in header information of each of the repair packets includes: information indicating the number of the source packets included in the source block per Packet ID value, and a start number of the source packets having the same Packet ID value and being included in the source block, and wherein the repair FEC payload ID in the header information of each of the repair packets is characterized in that the repair FEC payload ID further includes: information indicating whether the repair FEC payload ID is a dependent repair FEC payload ID which indicates that FEC-related configuration information necessary for the FEC decoding at the receiver is obtainable from a combination of information in the dependent repair FEC payload ID and the signaling message or an independent repair FEC payload ID which indicates that FEC-related configuration information necessary for the FEC decoding at the receiver is obtainable from information in the independent repair FEC payload ID without the signaling message. generating a source packet block including the source packets for transmission of a content; generating a repair packet block including repair packets from the generated source packet block by performing forward error correction, FEC, encoding to enable a receiver to restore a source packet of the source packet block lost during transmission by performing FEC decoding; and transmitting a packet stream including the repair packets of the repair packet block, and the source packets of the source packet block and a packet for a signaling message including packet identification, Packet ID, values for the source packet block, wherein a repair FEC payload identification, ID, included in header information of each of the repair packets includes: information indicating the number of the source packets included in the source block per Packet ID value, and a start number of the source packets having the same Packet ID value and being included in the source block, and information indicating the number of the source packets included in the source block per Packet ID value, and a start number of the source packets having the same Packet ID value and being included in the source block, and wherein the repair FEC payload ID in the header information of each of the repair packets is characterized in that the repair FEC payload ID further includes: information indicating whether the repair FEC payload ID is a dependent repair FEC payload ID which indicates that FEC-related configuration information necessary for the FEC decoding at the receiver is obtainable from a combination of information in the dependent repair FEC payload ID and the signaling message or an independent repair FEC payload ID which indicates that FEC-related configuration information necessary for the FEC decoding at the receiver is obtainable from information in the independent repair FEC payload ID without the signaling message. <EOS>