# US 2023/0054474 A1 · Device for generating broadcast signal frame including preamble indicating starting position of first complete fec block, and method for generating broadcast signal frame > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0054474 A1 - Document ID: US20230054474A1 - Status: Published application - Kind: A1 - Application number: 17/714,279 - Filed: 2022-04-06 - Published: 2023-02-23 - Earliest claimed: 2016-09-12 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Sun-Hyoung KWON; Sung-Ik PARK; Jae-Young LEE; Bo-Mi LIM; Heung-Mook KIM; Nam-Ho HUR - Web page: https://patentgrep.com/patent/US20230054474A1 ## CPC - H04L 1/0041: {Arrangements at the transmitter end} - H03M 13/255: {with Low Density Parity Check [LDPC] codes} - H03M 13/2732: {Convolutional interleaver; Interleavers using shift-registers or delay lines like, e.g. Ramsey type interleaver} - H04J 99/00: Subject matter not provided for in other groups of this subclass - H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} - H04L 1/0048: {in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder (for spatial equalizer H04L25/03286)} - H04L 1/0057: {Block codes (H04L1/0061, H04L1/0064 take precedence)} - H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)} - H04L 1/0075: {Transmission of coding parameters to receiver (H04L1/0023 takes precedence)} - H04L 1/0083: {Formatting with frames or packets; Protocol or part of protocol for error control} - H04L 1/009: {arrangements specific to transmitters} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) ## Abstract An apparatus and method for generating a broadcast signal frame corresponding to a time interleaver supporting a plurality of operation modes are disclosed. An apparatus for generating broadcast signal frame according to an embodiment of the present invention includes a combiner configured to generate a multiplexed signal by combining a core layer signal and an enhanced layer signal; a power normalizer configured to reduce the power of the multiplexed signal to a power level corresponding to the core layer signal; a time interleaver configured to generate a time-interleaved signal by performing interleaving that is applied to both the core layer signal and the enhanced layer signal; and a frame builder configured to generate a broadcast signal frame including a preamble for signaling time interleaver information corresponding to the time interleaver, the preamble includes a field indicating a start position of a first complete FEC block corresponding to each of physical layer pipes. ## Claims ### Claim 1 A broadcast signal reception apparatus, comprising: a time deinterleaver configured to perform time deinterleaving on a received signal corresponding to a broadcast signal frame, the broadcast signal frame including a preamble for signaling time interleaver information corresponding to a time interleaver; a core layer BICM decoder configured to restore core layer data corresponding to the broadcast signal frame; an enhanced layer symbol extractor configured to extract enhanced layer symbols by performing cancellation corresponding to restored core layer data; and an enhanced layer BICM decoder configured to restore enhanced layer data corresponding to the enhanced layer symbols. ### Claim 2 (depends on 1) The broadcast signal reception apparatus of claim 1, wherein the time interleaver performs time interleaving by using one of a plurality of operation modes, wherein the operation modes include a first mode corresponding to no time interleaving, a second mode for performing a convolutional time interleaving, and a third mode for performing a hybrid time interleaving. ### Claim 3 (depends on 2) The broadcast signal reception apparatus of claim 2, wherein the preamble includes a first field indicating a start position of a first complete FEC block corresponding to each of physical layer pipes for the first mode or a second field indicating a start position of a first complete FEC block corresponding to each of physical layer pipes for the second mode, and does not include any field indicating the start position of the first complete FEC block for the third mode. ### Claim 4 (depends on 3) The broadcast signal reception apparatus of claim 3, wherein the second field has a length longer than the first field. ### Claim 5 (depends on 3) The broadcast signal reception apparatus of claim 3, wherein the length of the first field is 15 bits, and the length of the second field is 22 bits. ### Claim 6 (depends on 5) The broadcast signal reception apparatus of claim 5, wherein when the time interleaver corresponds to the second mode, the start position of the first complete FEC block indicates a first cell of the first complete FEC block, with respect to before the convolutional time interleaving, and a position of the first cell of the first complete FEC block is signaled with respect to after the convolutional time interleaving. ### Claim 7 (depends on 6) The broadcast signal reception apparatus of claim 6, wherein the second field corresponds to a position after the convolutional time interleaving, the position after the convolutional time interleaving calculated by adding a position (C) before the convolutional time interleaving and a delay caused by the convolutional time interleaving. ### Claim 8 (depends on 7) The broadcast signal reception apparatus of claim 7, wherein the delay caused by the convolutional time interleaving is calculated by using a position (L1D_plp_CTI_start_row) of an interleaver selector corresponding to the convolutional time interleaving. ### Claim 9 (depends on 8) The broadcast signal reception apparatus of claim 8, wherein the delay caused by the convolutional time interleaving is calculated by using a modulo operation of a sum (L1D_plp_CTI_start_row+C) of the position of the interleaver selector corresponding to the convolutional time interleaving and the position before the convolutional time interleaving, and the number (N_row) of delay lines corresponding to the convolutional time interleaving. ### Claim 10 (depends on 9) The broadcast signal reception apparatus of claim 9, wherein the position of the interleaver selector is signaled only for core layer physical layer pipes corresponding to the core layer, and is not signaled for enhanced layer physical layer pipes corresponding to the enhanced layer. ### Claim 11 (depends on 10) The broadcast signal reception apparatus of claim 10, wherein the position of the interleaver selector for the enhanced layer physical layer pipe is calculated by using the position of the interleaver selector signaled for the core layer physical layer pipe corresponding to the enhanced layer physical layer pipe. ### Claim 12 (depends on 5) The broadcast signal reception apparatus of claim 5, wherein the first field or the second field is separately signaled for the core layer physical layer pipes and the enhanced layer physical layer pipes. ### Claim 13 A broadcast signal reception method, comprising: performing time deinterleaving on a received signal corresponding to a broadcast signal frame, the broadcast signal frame including a preamble for signaling time interleaver information corresponding to a time interleaver; restoring, by a core layer BICM decoder, core layer data corresponding to the broadcast signal frame; extracting enhanced layer symbols by performing cancellation corresponding to restored core layer data using the output from the core layer BICM decoder; and restoring, by an enhanced layer BICM decoder, enhanced layer data corresponding to the enhanced layer symbols, wherein the time interleaver performs time interleaving by using one of a plurality of operation modes, wherein the operation modes include a first mode corresponding to no time interleaving, a second mode for performing a convolutional time interleaving, and a third mode for performing a hybrid time interleaving.