# US 10,484,759 B2 · Transmission device, transmission method, reception device, and reception method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,759 B2 - Document ID: US10484759B2 - Status: Granted - Kind: B2 - Application number: 15/554,016 - Filed: 2016-05-19 - Published: 2018-03-15 - Granted: 2019-11-19 - Earliest claimed: 2015-06-02 - Assignees: Sony Corporation - Applicants: Sony Corporation - Inventors: Kazuyuki Takahashi; Lachlan Bruce Michael - Web page: https://patentgrep.com/patent/US10484759B2 ## CPC - H04N 21/8547: involving timestamps for synchronizing content - H04H 60/40: for identifying broadcast time - H04N 21/4305: {Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets (arrangements for synchronising receiver with transmitter by comparing receiver clock with transmitter clock H04L7/0012; arrangements for synchronising receiver with transmitter wherein the receiver takes measures against momentary loss of synchronisation H04L7/0083)} - H04N 21/6112: {involving terrestrial transmission, e.g. DVB-T} - H04N 21/6118: {involving cable transmission, e.g. using a cable modem} - H04N 21/6143: {involving transmission via a satellite} - H04N 21/64322: {IP} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - H04H: BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N) ## Abstract 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The transmission device according to claim 1, wherein the time information included in the time information descriptor is compressed. ### Claim 3 (depends on 2) 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. ### Claim 4 (depends on 2) 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. ### Claim 5 (depends on 2) The transmission device according to claim 2, wherein the time information descriptor further includes a compression mode of the compressed time information. ### Claim 6 (depends on 2) The transmission device according to claim 2, wherein the time information is defined in Precise Time Protocol (PTP). ### Claim 7 (depends on 6) 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. ### Claim 8 (depends on 7) 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. ### Claim 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. ### Claim 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. ### Claim 11 (depends on 10) The reception device according to claim 10, wherein the time information included in the time information descriptor is compressed. ### Claim 12 (depends on 11) 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. ### Claim 13 (depends on 11) 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. ### Claim 14 (depends on 11) The reception device according to claim 11, wherein the time information descriptor further includes a compression mode of the compressed time information. ### Claim 15 (depends on 11) The reception device according to claim 11, wherein the time information is defined in Precise Time Protocol (PTP). ### Claim 16 (depends on 15) 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. ### Claim 17 (depends on 16) 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. ### Claim 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.