Digital broadcast system for transmitting/receiving digital broadcast data, and data processing method for use in the same

• US 8,135,034 B2
• Filed: 06/26/2008
• Issued: 03/13/2012
• Est. Priority Date: 06/26/2007
• Status: Expired due to Fees

• 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): Vu, Huy
• Assistant Examiner(s): Bednash, Joseph A.
• Application Number:
  US12/147,112
• Publication Number:
  US 20090028079A1
• Time in Patent Office: 1,356 Days
• Field of Search: 370/310, 370/474, 370/475, 370/476, 375/240.27, 375/301, 375/316
• US Class Current: 370/474
• CPC Class Codes: H03M 13/2732 Convolutional interleaver; Interleavers using shift-registers or delay lines like, e.g. Ramsey type interleaver
• CPC Class Codes: H03M 13/2792 Interleaver wherein interleaving is performed jointly with another technique such as puncturing, multiplexing or routing
• CPC Class Codes: H03M 13/2906 using block codes H03M13/2957 takes precedence
• CPC Class Codes: H04L 1/0034 where the transmitter decides based on inferences, e.g. use of implicit signalling
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0042 Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape H04L1/0067 takes precedence
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0058 Block-coded modulation
• CPC Class Codes: H04L 1/006 Trellis-coded modulation
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 2101/659 Internet protocol version 6 [IPv6] addresses
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04N 21/41407 embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop constructional details of equipment or arrangements specially adapted for portable computer application G06F1/1626; arrangements specially adapted for mobile receivers in broadcast systems H04H20/57
• CPC Class Codes: H04N 21/42607 for processing the incoming bitstream
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/4345 Extraction or processing of SI, e.g. extracting service information from an MPEG stream
• CPC Class Codes: H04N 21/44209 Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896
• CPC Class Codes: H04N 21/64322 : IP

Abstract

The present invention is directed to a digital broadcast system and a data processing method. A broadcast signal in which mobile service data and main service data are multiplexed is transmitted and received. Then, in a broadcasting receiver, the program table information including information about a service or a program of an ensemble is parsed according to an identifier of the ensemble in which the mobile service data are multiplexed, in the received broadcast signal. And a mobile service is outputted by using the mobile service data and the parsed program table information.

Claims

1. A method of processing data in a receiver, the method comprising:

receiving a broadcast signal comprising data groups, wherein each of the data groups is divided into data blocks that comprise mobile service data, fast information channel (FIC) data, transmission parameter channel (TPC) data, and a plurality of known data sequences, wherein one of the plurality of known data sequences includes a first M-symbol sequence and a second M-symbol sequence that have a same pattern, and wherein M is an integer greater than 1;

estimating an initial frequency offset by partial correlating the first M- symbol sequence and the second M-symbol sequence;

performing carrier recovery on the broadcast signal based on the estimated initial frequency offset;

decoding the FIC data and the TPC data, which are independent from each other, from the carrier recovered broadcast signal, the FIC data comprising cross layer information for mobile service acquisition, and the TPC data comprising FIC version information for identifying an update of the FIC data and Serial Concatenated Convolutional Code (SCCC) block mode information for identifying a relationship between SCCC blocks and the data blocks, wherein each SCCC block is constituted of a single data block when a value of the SCCC block mode information is set to ‘

00’ and

each SCCC block is constituted of two data blocks when the value of the SCCC block mode information is set to ‘

01’

;

turbo-decoding the mobile service data in the carrier recovered broadcast signal in SCCC block units according to the SCCC block mode information included in the TPC data;

building a Reed-Solomon (RS) frame including the turbo-decoded mobile service data and acquiring a service map table (SMT) from an ensemble including the RS frame, the ensemble being identified by an ensemble identifier, and the SMT comprising a header including the ensemble identifier and a payload including service acquisition information; and

accessing IP datagrams of the mobile service data from the RS frame according to the service acquisition information.

2. The method of claim 1, wherein the service acquisition information comprises IP address information for accessing to the IP datagrams of the mobile service data.

3. The method of claim 2, wherein the IP address information comprises:

an IP address; and

address indication information indicating whether a version of the IP address is IPv4 or IPv6.

4. The method of claim 1, wherein the SMT includes program information.

5. The method of claim 4, wherein the program information comprises at least time information or text information of a program.

6. The method of claim 1, further comprising detecting position information of at least one of the plurality of known data sequences from the broadcast signal, wherein the TPC data and the FIC data are inserted between a first known data sequence and a second data sequence of the plurality of known data sequences.

7. The method of claim 6, further comprising channel- equalizing the carrier recovered broadcast signal based on the detected position information of the at least one of the plurality of known data sequences.

8. The method of claim 6, wherein at least two of the plurality of known data sequences have different lengths.

9. The method of claim 1, wherein the FIC data and TPC data are encoded with a Parallel Concatenated Convolutional Code (PCCC) and the RS frame is encoded with a Serial Concatenated Convolutional Code (SCCC).

10. A receiver comprising:

a receiving unit for receiving a broadcast signal comprising data groups, wherein each of the data groups is divided into data blocks that comprise mobile service data, fast information channel (FIC) data, transmission parameter channel (TPC) data, and a plurality of known data sequences, wherein one of the plurality of known data sequences includes a first M-symbol sequence and a second M-symbol sequence that have a same pattern, and wherein M is an integer greater than 1;

an initial frequency offset estimator for estimating an initial frequency offset by partial correlating the first M-symbol sequence and the second M-symbol sequence;

a carrier recovery unit for performing carrier recovery on the broadcast signal based on the estimated initial frequency offset;

a signaling decoder for decoding the FIC data and the TPC data, which are independent from each other, from the carrier recovered broadcast signal, the FIC data comprising cross layer information for mobile service acquisition, and the TPC data comprising FIC version information for identifying an update of the FIC data and Serial Concatenated Convolutional Code (SCCC) block mode information for identifying a relationship between SCCC blocks and the data blocks, wherein each SCCC block is constitiuted if a single data block when a value of the SCCC block mode information is set to ‘

00’ and

each SCCC block is constituted of two data blocks when the value of the SCCC block mode information is set to ‘

01’

;

a block decoder for turbo-decoding the mobile service data in the carrier recovered broadcast signal according to the SCCC block mode information included in the TPC data;

a first processor for building a Reed-Solomon (RS) frame including the turbo- decoded mobile service data and acquiring a service map table (SMT) from an ensemble including the RS frame, the ensemble being identified by an ensemble identifier, and the SMT comprising a header including the ensemble identifier and a payload including service acquisition information; and

a second processor for accessing IP datagrams of the mobile service data according to the service acquisition information.

11. The receiver of claim 10, wherein the service acquisition information comprises IP address information for accessing to IP datagrams of the mobile service data.

12. The receiver of claim 11, wherein the IP address information comprises:

an IP address; and

address indication information indicating whether a version of the IP address is IPv4 or IPv6.

13. The receiver of claim 10, wherein the SMT includes program information.

14. The receiver of claim 13, wherein the program information comprises at least time information or text information of a program.

15. The receiver of claim 10, further comprising a known data detector for detecting position information of at least one of the plurality of known data sequences from the broadcast signal, wherein the TPC data and the FIC data are inserted between a first known data sequence and a second known data sequence of the plurality of known data sequences.

16. The receiver of claim 15, further comprising a channel equalizer for channel-equalizing the carrier recovered broadcast signal based on the detected position information of the at least one of the plurality of known data sequences.

17. The receiver of claim 10, wherein at least two of the plurality of known data sequences have different lengths.

18. The receiver of claim 10, wherein the FIC data and TPC data are encoded with a Parallel Concatenated Convolutional Code (PCCC) and the RS frame is encoded with a Serial Concatenated Convolutional Code (SCCC).