Reception apparatus, reception method, transmission apparatus, and transmission method for indicating presence or absence of signaling information in a payload of a packet
[Object] The present technology relates to a reception apparatus, a reception method, a transmission apparatus, and a transmission method that enable more flexible operations to be performed. [Solving Means] A reception apparatus receives a content transmitted in an IP transmission system, acquires, based on first control information that is transmitted in a first layer in a protocol stack of the IP transmission system and includes information indicating whether second control information transmitted in a second layer higher than the first layer exists, the second control information, and controls operations of units that process the content based on the second control information. The present technology is applicable to television receivers supporting the IP transmission system.
1. A reception apparatus, comprising:
a receiver configured to receive digital broadcasting signals and carry out orthogonal frequency division multiplexing (OFDM) demodulation on the digital broadcasting signals to obtain a physical layer frame; and
at least one processor configured to process the physical layer frame to acquire first signaling information arranged in a preamble of the physical layer frame, wherein
the first signaling information includes plural flags, each corresponding to a physical layer pipe of plural physical layer pipes, each of the plural flags representing presence or absence of second signaling information required for selecting a service arranged in the respective physical layer pipe,
the physical layer frame includes a bootstrap preceding the preamble,
the first signaling information is layer 1 (L1) signaling information transmitted in L1, and
the second signaling information is received in a packet of a layer higher than the layer 1, the packet including a header.
2. The reception apparatus according to claim 1 , wherein the second signaling information is transmitted in layer 2 (L2).
3. The reception apparatus according to claim 2 , wherein
the second signaling information includes a service information table, and
each of the plural flags represents presence or absence of the service information table in the respective physical layer pipe.
4. The reception apparatus according to claim 1 , wherein
the second signaling information includes information other than emergency alert information, and
each of the plural flags represents presence or absence of the information other than the emergency alert information in the respective physical layer pipe.
5. The reception apparatus according to claim 1 , wherein the reception apparatus is a television receiver.
6. The reception apparatus according to claim 1 ,
wherein the reception apparatus includes a display and a speaker,
wherein the at least one processor is configured to decode video data and audio data,
wherein the display is configured to display video corresponding to the video data, and
wherein the speaker is configured to output audio corresponding to the audio data.
7. A reception method for a reception apparatus, comprising:
receiving, by a receiver, digital broadcasting signals and carrying out orthogonal frequency division multiplexing (OFDM) demodulation on the digital broadcasting signals to obtain a physical layer frame; and
processing, by at least one processor, the physical layer frame to acquire first signaling information arranged in a preamble of the physical layer frame, wherein
the first signaling information includes plural flags, each corresponding to a physical layer pipe of plural physical layer pipes, each of the plural flags representing presence or absence of second signaling information required for selecting a service arranged in the respective physical layer pipe,
the physical layer frame includes a bootstrap preceding the preamble,
the first signaling information is layer 1 (L1) signaling information transmitted in L1, and
the second signaling information is received in a packet of a layer higher than the layer 1, the packet including a header.
8. The reception method according to claim 7 , wherein the second signaling information is transmitted in layer 2 (L2).
9. The reception method according to claim 8 , wherein
the second signaling information includes a service information table, and
each of the plural flags represents presence or absence of the service information table in the respective physical layer pipe.
10. The reception method according to claim 7 , wherein
the second signaling information includes information other than emergency alert information, and
each of the plural flags represents presence or absence of the information other than the emergency alert information in the respective physical layer pipe.
11. The reception method according to claim 7 , wherein the method includes:
decoding video data and audio data, by the at least one processor,
displaying, by a display, video corresponding to the video data, and
outputting, by a speaker, audio corresponding to the audio data.
12. A transmission apparatus, comprising:
at least one processor configured to
generate a physical layer frame including first signaling information arranged in a preamble of the physical layer frame, and
perform orthogonal frequency division multiplexing (OFDM) modulation on the physical layer frame; and
a transmitter configured to transmit the OFDM modulated physical layer frame in digital broadcasting signals, wherein
the first signaling information includes plural flags, each corresponding to a physical layer pipe of plural physical layer pipes, each of the plural flags representing presence or absence of second signaling information required for selecting a service arranged in the respective physical layer pipe,
the physical layer frame includes a bootstrap preceding the preamble,
the first signaling information is layer 1 (L1) signaling information transmitted in L1, and
the second signaling information is transmitted in a packet of a layer higher than the layer 1, the packet including a header.
13. The transmission apparatus according to claim 12 , wherein the second signaling information is transmitted in layer 2 (L2).
14. The transmission apparatus according to claim 13 , wherein
the second signaling information includes a service information table, and
each of the plural flags represents presence or absence of the service information table in the respective physical layer pipe.
15. The transmission apparatus according to claim 12 , wherein
the second signaling information includes information other than emergency alert information, and
each of the plural flags represents presence or absence of the information other than the emergency alert information in the respective physical layer pipe.
16. A transmission method for a transmission apparatus, comprising:
generating, by at least one processor, a physical layer frame including first signaling information arranged in a preamble of the physical layer frame;
performing orthogonal frequency division multiplexing (OFDM) modulation on the physical layer frame; and
transmitting, by a transmitter, the OFDM modulated physical layer frame in digital broadcasting signals, wherein
the first signaling information includes plural flags, each corresponding to a physical layer pipe of plural physical layer pipes, each of the plural flags representing presence or absence of second signaling information required for selecting a service arranged in the respective physical layer pipe,
the physical layer frame includes a bootstrap preceding the preamble,
the first signaling information is layer 1 (L1) signaling information transmitted in L1, and
the second signaling information is transmitted in a packet of a layer higher than the layer 1, the packet including a header.
17. The transmission method according to claim 16 , wherein the second signaling information is transmitted in layer 2 (L2).
18. The transmission method according to claim 17 , wherein
the second signaling information includes a service information table, and
each of the plural flags represents the presence or absence of the service information table in the respective physical layer pipe.
19. The transmission method according to claim 16 , wherein
the second signaling information includes information other than emergency alert information, and
each of the plural flags represents presence or absence of the information other than the emergency alert information in the respective physical layer pipe.