# US 10,313,718 B2 · System physical layer pipe for a digital television system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,313,718 B2 - Document ID: US10313718B2 - Status: Granted - Kind: B2 - Application number: 14/913,407 - Filed: 2014-08-14 - Published: 2016-09-22 - Granted: 2019-06-04 - Earliest claimed: 2013-08-22 - Assignees: InterDigital CE Patent Holdings, SAS - Applicants: Interdigital Ce Patent Holdings - Inventors: John Sidney Stewart - Web page: https://patentgrep.com/patent/US10313718B2 ## CPC - H04N 21/2362: Generation or processing of Service Information [SI] - H04H 20/30: by a single channel - H04H 20/423: {Transmitter side} - H04H 20/59: for emergency or urgency - H04H 60/25: Arrangements for updating broadcast information or broadcast-related information - H04H 60/44: for identifying broadcast stations - H04H 60/73: using meta-information - H04L 1/0041: {Arrangements at the transmitter end} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 27/2601: {Multicarrier modulation systems} - H04N 21/23605: {Creation or processing of packetized elementary streams [PES]} - H04N 21/2365: Multiplexing of several video streams - H04N 21/2368: Multiplexing of audio and video streams - H04N 21/4341: {Demultiplexing of audio and video streams} - H04N 21/4345: {Extraction or processing of SI, e.g. extracting service information from an MPEG stream} - H04N 21/4347: {Demultiplexing of several video streams} - H04N 21/6106: {specially adapted to the downstream path of the transmission network} - H04N 21/6112: {involving terrestrial transmission, e.g. DVB-T} - H04N 21/643: Communication protocols {(network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP], H04L65/65)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - H04H: BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods and apparatuses are provided for transmitters and receivers for conveying and retrieving important system information carried in a multi-carrier modulation system for which the data stream is organized in multiple physical layer pipes (PLP). This is particularly important when broadcasters share the same physical channel. In one aspect of the present principles this is accomplished by assigning a PLP as a system PLP. The system PLP will carry information such as the mapping between a broadcaster and its PLPs and special messages like the Emergency Alert System and Amber Alert messages. In another aspect of the present principles, this information is carried in signaling data of the signal, instead of a PLP. In yet another aspect of the present principles, this is accomplished by a signaling parameter, which identifies the broadcaster associated with each PLP. ## Claims ### Claim 1 An apparatus for transmitting a multi-carrier modulated signal on a physical channel, said apparatus comprising: a source that provides data, said data comprising a broadcaster table identifying a plurality of broadcasters which are sharing said physical channel and providing a PLP id for each of a plurality of physical layer pipes (PLP) belonging to said plurality of broadcasters, wherein each physical layer pipe of the plurality of physical layer pipes represents a virtual channel or service and at least one PLP of the plurality of physical layer pipes is shared among at least two broadcasters in the plurality of broadcasters; and a multi-carrier modulator that modulates said data by allocating said data to a plurality of carriers of said physical channel in a plurality of modulation symbols; wherein the broadcaster table comprises a broadcaster id for each broadcaster of said plurality of broadcasters and a corresponding broadcaster system information PLP id, and a broadcaster system information PLP containing system information for each broadcaster; and wherein the broadcaster table further comprises a number of PLPs for each broadcaster and each PLP id for each broadcaster. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the broadcaster table comprises at least one broadcaster id for each PLP in said physical channel. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein the broadcaster table is placed in a separate PLP, called system PLP. ### Claim 4 (depends on 3) The apparatus according to claim 3, wherein the System PLP further comprises special messages and a special message indicator. ### Claim 5 (depends on 1) The apparatus according to claim 1 wherein said data further comprises signaling data and the broadcaster table is placed in the signaling data. ### Claim 6 (depends on 1) The apparatus according to claim 1 further comprising: a channel encoder for at least channel encoding said data prior to the multi-carrier modulator. ### Claim 7 (depends on 1) The apparatus according to claim 1 wherein the multi-carrier modulation is OFDM. ### Claim 8 An apparatus for receiving a multi-carrier modulated signal on a physical channel, said apparatus comprising: a multi-carrier demodulator that demodulates said signal to create demodulated symbols; and a data detector that retrieves a broadcaster table from said demodulated symbols, said broadcaster table identifying a plurality of broadcasters which are sharing said physical channel and for retrieving data, said data comprising a PLP id for each of a plurality of physical layer pipes (PLP) belonging to said plurality of broadcasters, wherein each physical layer pipe of the plurality of physical layer pipes represents a virtual channel or service and at least one PLP of the plurality of physical layer pipes is shared among at least two broadcasters in the plurality of broadcasters; wherein the broadcaster table comprises a broadcaster id for each broadcaster of said plurality of broadcasters and a corresponding broadcaster system information PLP id, and a broadcaster system information PLP containing system information for each broadcaster; and wherein the broadcaster table further comprises a number of PLPs for each broadcaster and each PLP id for each broadcaster. ### Claim 9 (depends on 8) The apparatus according to claim 8, wherein the broadcaster table comprises at least one broadcaster id for each PLP in said physical channel. ### Claim 10 (depends on 8) The apparatus according to claim 8, wherein the data detector retrieves the broadcaster table from a separate PLP, called system PLP. ### Claim 11 (depends on 10) The apparatus according to claim 10, wherein the data detector further retrieves a special message indicator and special message from said System PLP. ### Claim 12 (depends on 8) The apparatus according to claim 8 wherein said data further comprises signaling data and the data detector retrieves the broadcaster table from the signaling data. ### Claim 13 (depends on 8) The apparatus according to claim 8 further comprising: a channel decoder for at least channel decoding the output of the multi-carrier demodulator prior to recovering said broadcaster table. ### Claim 14 (depends on 8) The apparatus according to claim 8 wherein the multi-carrier modulation is OFDM. ### Claim 15 A method for transmitting a multi-carrier modulated signal on a physical channel, said method comprising: providing data, said data comprising a broadcaster table identifying a plurality of broadcasters which are sharing said physical channel and providing a PLP id for each of a plurality of physical layer pipes (PLP) belonging to said plurality of broadcasters, wherein each physical layer pipe of the plurality of physical layer pipes represents a virtual channel or service and at least one PLP of the plurality of physical layer pipes is shared among at least two broadcasters in the plurality of broadcasters; and multi-carrier modulating said data by allocating said data to a plurality of carriers of said physical channel in a plurality of modulation symbols; wherein the broadcaster table comprises a broadcaster id for each broadcaster in the plurality of broadcasters and a corresponding broadcaster system information PLP id, and a broadcaster system information PLP containing system information for each broadcaster, and wherein the broadcaster table further comprises a number of PLPs for each broadcaster and each PLP id for each broadcaster. ### Claim 16 (depends on 15) The method according to claim 15, wherein the broadcaster table comprises at least one broadcaster id for each PLP in said physical channel. ### Claim 17 (depends on 15) The method according to claim 15, wherein the broadcaster table is placed in a separate PLP, called system PLP. ### Claim 18 (depends on 17) The method according to claim 17, wherein the System PLP further comprises special messages and a special message indicator. ### Claim 19 (depends on 15) The method according to claim 15 wherein said data further comprises signaling data and the broadcaster table is placed in the signaling data. ### Claim 20 (depends on 15) The method according to claim 15 further comprising: channel encoding said data prior to the multi-carrier modulator. ### Claim 21 (depends on 15) The method according to claim 15 wherein the multi-carrier modulation is OFDM. ### Claim 22 A method for receiving a multi-carrier modulated signal on a physical channel, said method comprising: multi-carrier demodulating said signal to create demodulated symbols; and retrieving a broadcaster table from said demodulated symbols, said broadcaster table identifying a plurality of broadcasters which are sharing said physical channel and for retrieving data, said data comprising a PLP id for each of a plurality of physical layer pipes (PLP) belonging to said plurality of broadcasters, wherein each physical layer pipe of the plurality of physical layer pipes represents a virtual channel or service and at least one PLP of the plurality of physical layer pipes is shared among at least two broadcasters in the plurality of broadcasters; wherein the broadcaster table comprises a broadcaster id for each broadcaster in the plurality of broadcasters and a corresponding broadcaster system information PLP id and a broadcaster system information PLP containing system information for each broadcaster; and wherein the broadcaster table further comprises a number of PLPs for each broadcaster and each PLP id for each broadcaster. ### Claim 23 (depends on 22) The method according to claim 22, wherein the broadcaster table comprises at least one broadcaster id for each PLP in said physical channel. ### Claim 24 (depends on 22) The method according to claim 22, wherein the broadcaster table is retrieved from a separate PLP, called system PLP. ### Claim 25 (depends on 24) The method according to claim 24, wherein the System PLP further comprises special messages and a special message indicator. ### Claim 26 (depends on 22) The method according to claim 22 wherein said data further comprises signaling data and the broadcaster table is retrieved from the signaling data. ### Claim 27 (depends on 22) The method according to claim 22 further comprising: a channel decoder for at least channel decoding the output of the multi-carrier demodulator prior to recovering said broadcaster table. ### Claim 28 (depends on 22) The method according to claim 22 wherein the multi-carrier modulation is OFDM.