Digital broadcasting system and data processing method

• US 8,325,760 B2
• Filed: 06/30/2008
• Issued: 12/04/2012
• Est. Priority Date: 06/28/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Song, Jae Hyung, Choi, In Hwan, Hong, Ho Taek, Kwak, Kook Yeon, Kim, Byoung Gill, Suh, Jong Yeul, Kim, Jin Pil, Song, Won Gyu, Lee, Chul Soo, Kim, Jin Woo, Lee, Hyoung Gon, Lee, Joon Hui
• Primary Examiner(s): Phung, Luat
• Assistant Examiner(s): CHANG, KAI J
• Application Number:
  US12/164,862
• Publication Number:
  US 20090034442A1
• Time in Patent Office: 1,618 Days
• Field of Search: 370464-467, 714/751, 714/752, 714/758, 714/784, 714/800
• US Class Current: 370/466
• CPC Class Codes: H04H 20/30 by a single channel
• CPC Class Codes: H04H 20/426 Receiver side
• CPC Class Codes: H04H 20/55 for traffic information
• CPC Class Codes: H04H 20/57 for mobile receivers
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002

Abstract

A digital broadcasting system and a method of processing data are disclosed, which are robust to error when mobile service data are transmitted. To this end, additional encoding is performed for the mobile service data, whereby it is possible to strongly cope with fast channel change while giving robustness to the mobile service data.

Claims

1. A method of transmitting a broadcast signal from a transmitter, the method comprising:

pre-processing mobile data, wherein the pre-processing of the mobile data comprises;

encoding the mobile data to build a 2-dimensional Reed-Solomon (RS) frame through which an ensemble including a service of the mobile data is RS-Cyclic Redundancy Check (RS-CRC) encoded;

dividing the RS frame into serial concatenated convolutional coding (SCCC) blocks according to an SCCC block mode;

performing outer encoding of data in the SCCC blocks according to an SCCC code mode;

outputting data blocks including the outer-encoded data in the SCCC blocks, wherein the data blocks correspond to a plurality of data segments;

forming data groups of the mobile data, wherein the data groups include known data sequences including data pre-known in accordance with a prearranged agreement between a receiving system and a transmitting system, the data blocks, and signaling information, the signaling information including fast information channel (FIC) data having cross layer information between a physical layer and an upper layer and including transmission parameter channel (TPC) data indicating a version of the FIC data; and

forming a mobile data packets including data in the data groups;

multiplexing the formed mobile data packets with main data packets including main data;

performing systematic RS encoding on the main data and non-systematic RS encoding on the mobile data;

interleaving the systematic RS encoded main data and the non-systematic RS encoded mobile data in the data groups; and

transmitting a transmission frame including the data groups having the interleaved systematic RS encoded main data and the interleaved non-systematic RS encoded mobile data, wherein a parade of the data groups are transmitted during slots in the transmission frame, the slots being basic time periods for multiplexing the mobile data and the main data,

wherein the TPC data includes information about a parade repetition cycle indicating a number of transmission frames that do not contain the parade and that are between transmission frames that do contain the parade,

wherein the data groups include a plurality of regions to which the data blocks are mapped according to the SCCC block mode identifying a relationship between the plurality of regions and the data blocks.

2. The method of claim 1, wherein a payload of the 2-dimensional RS frame includes 187 transport packets of the mobile data.

3. The method of claim 2, wherein a row of the payload of the 2-dimensional RS frame includes a transport packet of the mobile data.

4. The method of claim 3, wherein the transport packet has a 2-byte header.

5. A method of receiving a broadcast signal in a receiver, the method comprising:

receiving the broadcast signal including a transmission frame, wherein a parade of data groups in the broadcast signal is received during slots within the transmission frame, the slots being basic time periods for multiplexing mobile data and main data, and the data groups include signaling information, known data sequences including data pre-known in accordance with a prearranged agreement between a receiving system and a transmitting system, and data blocks of the mobile data, the data blocks including a plurality of data segments, the data groups including a plurality of regions to which the data blocks are mapped according to a serial concatenated convolutional coding (SCCC) block mode identifying a relationship between the plurality of regions and the data blocks;

demodulating the broadcast signal;

obtaining fast information channel (FIC) data from the signaling information, the FIC data having cross layer information between a physical layer and an upper layer;

obtaining transmission parameter channel (TPC) data from the signaling information indicating a version of the FIC data;

building a first Reed-Solomon (RS) frame corresponding to an ensemble of a service of the mobile data by collecting a plurality of data portions that are mapped to the data groups, the first RS frame being a 2-dimensional data frame through which the mobile data belonging to the ensemble is RS-Cyclic Redundancy Check (RS-CRC) encoded; and

performing error detection on the first RS frame and error correction on data in the first RS frame, wherein the TPC data includes information about a parade repetition cycle indicating a number of transmission frames that do not contain the parade and that are between transmission frames that do contain the parade.

6. The method of claim 5, wherein a payload of the first RS frame includes 187 transport packets of the mobile data.

7. The method of claim 6, wherein a row of the payload of the first RS frame includes a transport packet of the mobile data.

8. The method of claim 7, wherein the transport packet has a 2-byte header.

9. The method of claim 5, further comprising:

building a second RS frame, which corresponds to a second ensemble that is different from the first ensemble, by collecting a plurality of data portions from the broadcast signal demodulated; and

decoding the second RS frame corresponding to the second ensemble.

10. An apparatus for transmitting a broadcast signal, the apparatus comprising:

a pre-processor that is configured to pre-process mobile data and comprises;

a first encoder configured to encode the mobile data to build a 2-dimensional Reed-Solomon (RS) frame through which an ensemble including a service of the mobile data is RS-cyclic redundancy check (RS-CRC) encoded,

a processor configured to;

divide portions of the RS frame into serial concatenated convolutional coding (SCCC) blocks according to an SCCC block mode,

perform outer encoding on data in the SCCC blocks according to an SCCC code mode, and

output data blocks including the outer-encoded data, wherein the data blocks correspond to a plurality of data segments,

a group formatter configured to form data groups of the mobile data, wherein the data groups include known data sequences including data pre-known in accordance with a prearranged agreement between a receiving system and a transmitting system, the data blocks, and signaling information, wherein the signaling information includes fast information channel (FIC) data having cross layer information between a physical layer and an upper layer and includes transmission parameter channel (TPC) data indicating a version of the FIC data, and

a packet formatter configured to form mobile data packets including data in the data groups;

a multiplexer configured to multiplex the mobile data packets main data packets including main data;

a second encoder configured to perform systematic RS encoding on the main data and non-systematic RS encoding on the mobile data;

an interleaver configured to interleave the systematic RS encoded main data and the non-systematic RS encoded mobile data in the data groups; and

a transmission unit configured to transmit a transmission frame including the data groups having the interleaved systematic RS encoded main data and the interleaved non-systematic RS encoded mobile data, wherein a parade of the data groups are transmitted during slots in the transmission frame, the slots being basic time periods for multiplexing the mobile data and the main data,

wherein the TPC data includes information about a parade repetition cycle indicating a number of transmission frames that do not contain the parade and that are between transmission frames that do contain the parade,

wherein the data groups include a plurality of regions to which the data blocks are mapped according to the SCCC block mode identifying a relationship between the plurality of regions and the data blocks.

11. The apparatus of claim 10, wherein a payload of the 2-dimensional RS frame includes 187 transport packets of the mobile data.

12. The apparatus of claim 11, wherein a row of the payload of the 2-dimensional RS frame includes a transport packet of the mobile data.

13. The apparatus of claim 12, wherein the transport packet has a 2-byte header.

14. An apparatus for receiving a broadcast signal, the apparatus comprising:

a tuner configured to receive the broadcast signal including a transmission frame, wherein a parade of data groups in the broadcast signal is received during slots within the transmission frame, the slots being basic time periods for multiplexing mobile data and main data, and the data groups include signaling information, known data sequences including data pre-known in accordance with a prearranged agreement between a receiving system and a transmitting system, and data blocks of the mobile data, the data blocks including a plurality of data segments, the data groups including a plurality of regions to which the data blocks are mapped according to a serial concatenated convolutional coding (SCCC) block mode identifying a relationship between the plurality of regions and the data blocks;

a demodulator configured to;

demodulate the broadcast signal, and

obtain fast information channel (FIC) data having cross layer information between a physical layer and an upper layer from the signaling information;

obtain transmission parameter channel (TPC) data indicating a version of the FIC data from the signaling information; and

a first RS frame decoder configured to;

build a first Reed-Solomon (RS) frame corresponding to an ensemble of a service of the mobile data by collecting a plurality of data portions that are mapped to the data groups, the first RS frame being a 2-dimensional data frame through that the mobile data belonging to the ensemble is RS-cyclic redundancy check (RS-CRC) encoded, and

perform error detection on the first RS frame and error correction on data in the first RS frame, wherein the TPC data includes information about a parade repetition cycle indicating a number of transmission frames that do not contain the parade and that are between transmission frames that do contain the parade.

15. The apparatus of claim 14, wherein a payload of the first RS frame includes 187 transport packets of the mobile data.

16. The apparatus of claim 15, wherein a row of the payload of the first RS frame includes a transport packet of the mobile data.

17. The apparatus of claim 16, wherein the transport packet has a 2-byte header.

18. The apparatus of claim 14, further comprising:

a second RS frame decoder configured to build a second RS frame that corresponds to a second ensemble, that is different from the ensemble, by collecting a plurality of data portions from the broadcast signal demodulated, and to decode the second RS frame corresponding to the second ensemble.