Transmission apparatus, reception apparatus, and data processing method
The present technology relates to a transmission apparatus, a reception apparatus, and a data processing method capable of efficiently transmitting time information with high accuracy. The transmission apparatus generates a physical layer frame including the time information and transmits the physical layer frame. The reception apparatus receives the physical layer frame from the transmission apparatus and performs predetermined processing on the basis of the time information included in the physical layer frame. Time information indicating a certain time is included at a head of the physical layer frame. The present technology can be applied to digital television broadcasting using the IP system.
1. A transmission apparatus comprising:
processing circuitry configured to generate a physical layer frame that includes time information at a head portion of the physical layer frame; and
transmission circuitry configured to transmit the physical layer frame according to frequency division multiplexing (FDM) in a frequency band, the frequency band including frequency segments that are arranged into one or more hierarchies,
wherein the time information indicates a time corresponding to a start position of the physical layer frame.
2. The transmission apparatus according to claim 1 , wherein
a boundary of the physical layer frame and a boundary of a packet included in the physical layer frame are in alignment.
3. The transmission apparatus according to claim 1 , wherein
a boundary of the physical layer frame and a boundary of a packet included in the physical layer frame are not in alignment.
4. The transmission apparatus according to claim 1 , wherein
the physical layer frame includes data over a single hierarchical layer, and
the time information is included at a head portion of the data over the single hierarchical layer.
5. The transmission apparatus according to claim 1 , wherein
the physical layer frame includes data over a plurality of hierarchical layers, and
the time information is included at head portions of the data over the hierarchical layers, respectively.
6. The transmission apparatus according to claim 1 , wherein
the physical layer frame includes transmission control information, and
the transmission control information includes the time information.
7. The transmission apparatus according to claim 1 , wherein
the time information is time information defined by network time protocol (NTP).
8. A data processing method, comprising:
generating, by processing circuitry of a transmission apparatus, a physical layer frame that includes time information at a head portion of the physical layer frame; and
transmitting, by transmission circuitry of the transmission apparatus, the physical layer frame according to frequency division multiplexing (FDM) in a frequency band, the frequency band including frequency segments that are arranged into one or more hierarchies,
wherein the time information indicates a time corresponding to a start position the physical layer frame.
9. A reception apparatus comprising:
reception circuitry configured to receive a physical layer frame that is transmitted according to frequency division multiplexing (FDM) in a frequency band, the frequency band including frequency segments that are arranged into one or more hierarchies; and
processing circuitry configured to
obtain time information from a head portion of the physical layer frame, the time information indicating a time corresponding to a start position of the physical layer frame, and
perform predetermined processing on the basis of the time information.
10. The reception apparatus according to claim 9 , wherein
the processing circuitry is configured to perform clock synchronization on the basis of the time information.
11. The reception apparatus according to claim 10 , wherein
a boundary of the physical layer frame and a boundary of a packet included in the physical layer frame are in alignment.
12. The reception apparatus according to claim 10 , wherein
a boundary of the physical layer frame and a boundary of a packet included in the physical layer frame are not in alignment.
13. The reception apparatus according to claim 10 , wherein
the physical layer frame includes data over a single hierarchical layer, and
the time information is included at a head portion of the data over the single hierarchical layer.
14. The reception apparatus according to claim 10 , wherein
the physical layer frame includes data over a plurality of hierarchical layers, and
the time information is included at head portions of the data over the hierarchical layers, respectively.
15. The reception apparatus according to claim 10 , wherein
the physical layer frame includes transmission control information, and
the transmission control information includes the time information.
16. The reception apparatus according to claim 10 , wherein
the time information is time information defined by NTP.
17. A data processing method, comprising:
receiving, by reception circuitry of a reception apparatus, a physical layer frame that is transmitted according to frequency division multiplexing (FDM) in a frequency band, the frequency band including frequency segments that are arranged into one or more hierarchies;
obtaining, by processing circuitry of the reception apparatus, time information from a head portion of the physical layer frame, the time information indicating a time corresponding to a start position of the physical layer frame; and
performing, by the processing circuitry of the reception apparatus, predetermined processing on the basis of the time information.