Transmission method, reception method, transmission apparatus, and reception apparatus that utilize an object IP packet containing first reference clock information that indicates time for reproduction of content in a data structure different from a structure of a MPEG media transport (MMT) packet

A reception method comprising:

• receiving by broadcast one or more frames for content transfer using Internet Protocol (IP) packets, the one or more frames storing first reference clock information and second reference clock information;
• extracting at least one piece of the first reference clock information and the second reference clock information from the received one or more frames;
• and
• generating a clock for reproducing the content by using the at least one piece of extracted reference clock information, wherein
• each of the one or more frames contains a plurality of second transfer units,
• each of the plurality of second transfer units contains one or more first transfer units,
• each of the one or more first transfer units contains at least one of the IP packets,
• the first reference clock information is contained in an IP packet of the IP packets which is stored in a first transfer unit positioned at a head in the one or more frames, the first reference clock information having a data structure different from a data structure of a MPEG Media Transport (MMT) packet,
• header compression processing is omitted on the IP packet in which the first reference clock information is stored, and
• the second reference clock information is stored in control information contained in each of the one or more frames.

A transmission apparatus comprising:

• generating circuitry which, in operation, generates one or more frames for content transfer using Internet Protocol (IP) packets;
• and
• transmitting circuitry which, in operation, transmits the one or more generated frames by broadcast, wherein
• each of the one or more frames contains a plurality of second transfer units,
• each of the plurality of second transfer units contains one or more first transfer units,
• each of the one or more first transfer units contains at least one of the IP packets,
• the generating circuitry comprises:
• first reference clock information generating circuitry which, in operation, generates first reference clock information that indicates time for reproduction of the content in a data structure different from a data structure of a MPEG Media Transport (MMT) packet;
• first reference clock information storing circuitry which, in operation, stores the first reference clock information in an object IP packet of the IP packets, the object IP packet being stored in a first transfer unit positioned at a head in the one or more frames;
• second reference clock information generating circuitry which, in operation, generates second reference clock information that indicates time for reproduction of the content;
• and
• second reference clock information storing circuitry which, in operation, stores the second reference clock information in control information of the one or more frames, and
• header compression processing on the object IP packet is omitted.

A reception apparatus comprising:

• receiving circuitry which, in operation, receives by broadcast one or more frames for content transfer using Internet Protocol (IP) packets, the one or more frames storing first reference clock information and second reference clock information;
• extracting circuitry which, in operation, extracts at least one piece of the first reference clock information and the second reference clock information from the received one or more frames;
• and
• generating circuitry which, in operation, generates a clock for reproducing the content by using the at least one piece of extracted reference clock information, wherein
• each of the one or more frames contains a plurality of second transfer units,
• each of the plurality of second transfer units contains one or more first transfer units,
• each of the one or more first transfer units contains at least one of the IP packets,
• the first reference clock information is contained in an IP packet of the IP packets which is stored in a first transfer unit positioned at a head in the one or more frames, the first reference clock information having a data structure different from a data structure of a MPEG Media Transport (MMT) packet,
• header compression processing is omitted on the IP packet in which the first reference clock information is stored, and
• the second reference clock information is stored in control information contained in each of the one or more frames.