Transmission method, reception method, transmission apparatus, and reception apparatus

1. A transmission method comprising:

generating one or more transfer frames that each store one or more streams used for content transfer; and

transmitting the one or more generated frames through broadcast,

each of the one or more streams storing one or more second transfer units,

each of the one or more second transfer units storing one or more first transfer units,

each of the one or more first transfer units storing one or more Internet Protocol (IP) packets, and

in at least one stream among the one or more streams, each of the first transfer units positioned at a head containing reference clock information indicating time used for reproduction of the content.

2. The transmission method according to claim 1 , wherein

each of the first transfer units is a variable-length transfer unit, and

each of the second transfer units is a fixed-length transfer unit.

3. The transmission method according to claim 1 , wherein each of the first transfer units positioned at a head contains the IP packets that do not undergo header compression processing.

4. The transmission method according to claim 1 , wherein

each of the first transfer units is a Type Length Value (TLV) packet,

each of the second transfer units is a slot under a transfer scheme of an advanced broadband satellite digital broadcast, and

each of the frames is a transfer slot under the transfer scheme of the advanced broadband satellite digital broadcast.

5. The transmission method according to claim 1 , wherein the reference clock information is a Network Time Protocol (NTP).

6. The transmission method according to claim 1 , wherein the one or more frames are transmitted in a predetermined transmission cycle.

7. A reception method comprising:

receiving one or more frames through broadcast;

extracting reference clock information from at least one frame among the one or more received frames; and

generating a clock used for reproduction of content by using the extracted reference clock information,

each of the one or more frames containing one or more second transfer units,

each of the one or more second transfer units containing one or more first transfer units, and

each of the one or more first transfer units containing one or more Internet Protocol (IP) packets.

8. A transmission apparatus comprising:

generation circuitry which, in operation, generates one or more frames used for content transfer; and

transmission circuitry which, in operation, transmits the one or more generated frames through broadcast,

each of the one or more streams storing one or more second transfer units,

each of the one or more second transfer units storing one or more first transfer units,

each of the one or more first transfer units storing one or more Internet Protocol (IP) packets, and

in at least one stream among the one or more streams, each of the first transfer units positioned at a head containing reference clock information indicating time used for reproduction of the content.

9. A reception apparatus comprising:

reception circuitry which, in operation, receives one or more frames;

extraction circuitry which, in operation, extracts reference clock information from at least one frame among the one or more received frames; and

generation circuitry which, in operation, generates a clock used for reproduction of content by using the extracted reference clock information,

each of the one or more frames containing one or more second transfer units,

each of the one or more second transfer units containing one or more first transfer units, and

each of the one or more first transfer units containing one or more Internet Protocol (IP) packets.