Transmission device, transmission method, reception device, and reception method
There is provided a transmission device including circuitry configured to generate a physical layer frame. A time information descriptor is included in a preamble of the physical layer frame. The time information descriptor includes a time information flag that indicates presence or absence of time information in the time information descriptor. The circuitry is configured to transmit the physical layer frame including the preamble and a payload. The time information indicates a time of a predetermined position in a stream of the physical layer frame.
1. A transmission device, comprising:
circuitry configured to
generate a physical layer frame, a time information descriptor is included in a preamble of the physical layer frame, the time information descriptor including a time information flag that indicates presence or absence of time information in the time information descriptor; and
transmit the physical layer frame including a bootstrap, the preamble, and a payload, wherein
the time information indicates a time at a head of the bootstrap, which is adjacent to the preamble in a stream of the physical layer frame, the time being kept by a predetermined standard.
2. The transmission device according to claim 1 , wherein the time information included in the time information descriptor is compressed.
3. The transmission device according to claim 2 , wherein at least one low-order bit of the time information is deleted to generate the compressed time information.
4. The transmission device according to claim 2 , wherein at least one high-order bit of the time information, having a value of 0, is deleted to generate the compressed time information.
5. The transmission device according to claim 2 , wherein the time information descriptor further includes a compression mode of the compressed time information.
6. The transmission device according to claim 2 , wherein the time information is defined in Precise Time Protocol (PTP).
7. The transmission device according to claim 6 , wherein, in a 48-bit second field and a 32-bit nanosecond field included in the time information defined in the PTP, at least one high-order bit of the second field in the time information is deleted and at least one low-order bit of the nanosecond field in the time information is deleted to generate the compressed time information.
8. The transmission device according to claim 7 , wherein 2 high-order bits of the nanosecond field in the time information are further deleted to generate the compressed time information.
9. A method of a transmission device for transmitting a physical layer frame, the method comprising:
generating, by circuitry of the transmission device, the physical layer frame, a time information descriptor is included in a preamble of the physical layer frame, the time information descriptor including a time information flag that indicates presence or absence of time information in the time information descriptor; and
transmitting, by the circuitry, the physical layer frame including a bootstrap, the preamble, and a payload, wherein
the time information indicates a time at a head of the bootstrap, which is adjacent to the preamble in a stream of the physical layer frame, the time being kept by a predetermined standard.
10. A reception device comprising:
circuitry configured to
receive a physical layer frame, a time information descriptor is included in a preamble of the physical layer frame, the time information descriptor including a time information flag that indicates presence or absence of time information in the time information descriptor; and
perform a process based on the time information when the time information is included in the time information descriptor, wherein
the time information indicates a time at a head of a bootstrap, which is adjacent to the preamble in a stream of the physical layer frame including the bootstrap, the preamble, and a payload, the time being kept by a predetermined standard.
11. The reception device according to claim 10 , wherein the time information included in the time information descriptor is compressed.
12. The reception device according to claim 11 , wherein at least one low-order bit of the time information is deleted to generate the compressed time information.
13. The reception device according to claim 11 , wherein at least one high-order bit of the time information, having a value of 0, is deleted to generate the compressed time information.
14. The reception device according to claim 11 , wherein the time information descriptor further includes a compression mode of the compressed time information.
15. The reception device according to claim 11 , wherein the time information is defined in Precise Time Protocol (PTP).
16. The reception device according to claim 15 , wherein, in a 48-bit second field and a 32-bit nanosecond field included in the time information defined in the PTP, at least one high-order bit of the second field in the time information is deleted and at least one low-order bit of the nanosecond field in the time information is deleted to generate the compressed time information.
17. The reception device according to claim 16 , wherein 2 high-order bits of the nanosecond field in the time information are further deleted to generate the compressed time information.
18. A method of a reception device for receiving a physical layer frame, the method comprising:
receiving, by circuitry of the reception device, the physical layer frame, a time information descriptor is included in a preamble of the physical layer frame, the time information descriptor including a time information flag that indicates presence or absence of time information in the time information descriptor; and
performing a process based on the time information when the time information is included in the time information descriptor, wherein
the time information indicates a time at a head of a bootstrap, which is adjacent to the preamble in a stream of the physical layer frame including the bootstrap, the preamble, and a payload, the time being kept by a predetermined standard.