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

A transmission method, comprising:

• generating frames, each frame including first control data, second control data, and a first transfer unit, the first transfer unit including one or more second transfer units, the first control data including first information indicating a start position of the one or more second transfer units within the first transfer unit, the second control data including second information indicating whether the first control data includes reference clock information or not, the first control data including the reference clock information when the second information indicates the first control data includes the reference clock information;
• and
• transmitting the frames.

A transmission apparatus, comprising:

• a frame configurator that, in operation, generates frames, each frame including first control data, second control data, and a first transfer unit, the first transfer unit including one or more second transfer units, the first control data including first information indicating a start position of the one or more second transfer units within the first transfer unit, the second control data including second information indicating whether the first control data includes reference clock information or not, the first control data including the reference clock information when the second information indicates the first control data includes the reference clock information;
• and
• a transmitter that, in operation, transmits the frames.