Method and apparatus for transmitting and receiving data packet in multimedia system

A method for transmitting a data packet by a transmitting apparatus in a multimedia system, the method comprising:

• generating a payload header and a payload;
• and
• transmitting the data packet including the payload header and the payload,
• wherein the payload header includes a fragment indicator including information about fragmentation of a data unit in a payload of the transmitted data packet and a fragment counter indicating a number of at least one payload, the at least one payload containing at least one fragment of the data unit the at least one payload following the payload of the transmitted data packet,
• wherein the fragment counter is reused on a basis that a total number of fragments of the data unit is larger than a maximum number indicated by the fragment counter,
• wherein it is identified that the fragment counter is to be reused based on the fragment indicator and the fragment counter,
• wherein the fragment indicator includes a value indicating that the payload contains a fragment of the data unit that is neither a first fragment nor a last fragment,
• wherein the fragment counter indicates that the number of the at least one payload is zero, and
• wherein the total number of the fragments of the data unit is counted based on the identification that the fragment counter is to be reused.

A receiving apparatus in a multimedia system, the receiving apparatus comprising:

• a receiver configured to receive a data packet;
• and
• a processor configured to:
• obtain, from a payload header of the received data packet, a fragment indicator including information about fragmentation of a data unit included in a payload of the received data packet and a fragment counter indicating a number of at least one payload containing at least one fragment of the data unit, the at least one payload following the payload of the received data packet, and
• identify that:
• the fragment counter is to be reused in a case that the fragment indicator includes a value indicating that the payload contains a fragment of the data unit that is neither a first fragment nor a last fragment, and
• the fragment counter indicates that the number of at least one payload is zero,
• wherein a total number of fragments of the data unit is larger than a maximum number representable by the fragment counter, and
• wherein the total number of the fragments of the data unit is counted based on identification that the fragment counter is to be reused.

A transmitting apparatus in a multimedia system, the transmitting apparatus comprising:

• a processor configured to generate a payload header and a payload;
• and
• a transmitter configured to transmit a data packet including the payload header and the payload,
• wherein the payload header includes:
• a fragment indicator including information about fragmentation of a data unit in a payload of the transmitted data packet, and
• a fragment counter indicating a number of at least one payload, the at least one payload containing at least one fragment of the data unit, the at least one payload following the payload of the transmitted data packet,
• wherein the fragment counter is reused on a basis that a total number of fragments of the data unit is larger than a maximum number indicated by the fragment counter,
• wherein it is identified that the fragment counter is to be reused based on the fragment indicator and the fragment counter,
• wherein the fragment indicator includes a value indicating that the payload contains a fragment of the data unit that is neither a first fragment nor a last fragment,
• wherein the fragment counter indicates that the number of the at least one payload is zero, and
• wherein the total number of the fragments of the data unit is counted based on the identification that the fragment counter is to be reused.