Method and apparatus for re-transmitting MMT packet and method and apparatus for requesting MMT packet re-transmission

A method of an MPEG media transport (MMT) packet receiving apparatus for requesting re-transmission of a lost packet, the method comprising:

• receiving an MMT packet and an automatic repeat request (ARQ) configuration (AC) message from an MMT packet transmission apparatus, wherein the AC message comprises a delay_constrained_ARQ_flag to indicate whether the MMT packet transmission apparatus supports a delay-constrained ARQ function;
• and
• in response to the delay_constrained_ARQ_flag indicating that the MMT packet transmission apparatus supports a delay-constrained ARQ function
• generating multiple media fragment units (MFUs) by depacketizing the received MMT packet and processing the depacketized MMT packet, and
• transmitting an ARQ feedback (AF) message for requesting re-transmission of the lost packet in case the MMT packet is lost during the transmission from the MMT packet transmission apparatus.

A processing method of an MPEG media transport (MMT) packet transmission apparatus for re-transmitting a lost packet, the processing method comprising:

• transmitting an automatic repeat request (ARQ) configuration (AC) message to an MMT packet receiving apparatus, wherein the AC message comprises a delay_constrained_ARQ_flag to indicate whether the MMT packet transmission apparatus supports a delay-constrained ARQ function;
• and
• in response to the delay constrained ARQ flag indicating that the MMT packet transmission apparatus supports a delay-constrained ARQ function
• receiving an ARQ feedback (AF) message from the MMT packet receiving apparatus to request re-transmission of the lost packet, wherein the AF message comprises timing information, and
• determining whether to transmit the lost packet requested to be re-transmitted using the received timing information.