DIGITAL BROADCASTING SYSTEM AND DATA PROCESSING METHOD

• US 20090034442A1
• Filed: 06/30/2008
• Published: 02/05/2009
• Est. Priority Date: 06/28/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Byoung Gill, Suh, Jong Yeul, Lee, Hyoung Gon, Hong, Ho Taek, Choi, In Hwan, Lee, Chul Soo, Kim, Jin Pil, Song, Jae Hyung, Song, Won Gyu, Kwak, Kook Yeon, Kim, Jin Woo, Lee, Joon Hul
• Granted Patent: US 8,325,760 B2
• Time in Patent Office: Days
• US Class Current: 370/310
• 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 receiving system comprising:

a signal receiving unit for receiving a broadcasting signal where a plurality of parades and main service data are multiplexed, each parade including one or two RS frames, each of the RS frame including a plurality of MPH service data packets, each of the MPH service data packets including MPH header of M bytes and payload of N-M bytes, the MPH header including identification information;

a demodulating unit for demodulating data of the RS frame of the broadcasting signal received in the signal receiving unit;

a demultiplexer for dividing a parade including a mobile service requested from a user, from the plurality of parades, using at least one of parade ID and service ID of the MPH header within each MPH service data packet of the demodulated RS frame, and extracting IP datagram of the mobile service data from payload of the corresponding MPH service data packet with reference to data type information of the MPH header within the MPH service data packet received in the divided parade;

a memory for being operated to temporarily store the extracted IP datagram of the mobile service data, wherein the memory includes at least one; and

an IP data processor for outputting audio/video data for audio/video decoding if the temporarily stored IP datagram of the mobile service data is the audio/video data.

2. The receiving system as claimed in claim 1, wherein the demodulating unit detects known data, which are known by agreement between a transmitting side and a receiving side, from the broadcasting signal received in the signal receiving unit, so that the known data are used for data demodulation and channel equalization of the RS frame.

3. The receiving system as claimed in claim 1, wherein the demodulating unit includes:

a demodulator for converting data of the RS frame of the broadcasting signal received in the signal receiving unit, into base band RS frame data;

an equalizer for channel-equalizing the data demodulated by the demodulator;

a decoder for performing turbo decoding for the data equalized by the equalizer in a block unit; and

an error corrector for correcting an error occurring in the data decoded by the decoder.

4. The receiving system as claimed in claim 1, wherein, if each parade includes one RS frame, data of the RS frame are allocated to at least some region of a plurality of data groups consisting of a plurality of regions.

5. The receiving system as claimed in claim 1, wherein, if each parade includes two RS frames, data of one RS frame are allocated to at least some region of a plurality of data groups consisting of a plurality of regions, and data of the other RS frame are allocated to the other regions.

6. The receiving system as claimed in claim 1, further comprising a power controller for turning on the power in only the memory corresponding to the parade divided by the demultiplexer, among a plurality of memories when the memory includes the plurality of memories.

7. The receiving system as claimed in claim 1, wherein the MPH header includes parade ID information for identifying a parade, which transmits the RS frame of the corresponding MPH service data packet, service ID information for identifying a mobile service transmitted to the payload of the corresponding MPH service data packet, and data type information for identifying whether the data received in the payload within the corresponding MPH service data packet is IP datagram of mobile service data.

8. The receiving system as claimed in claim 7, wherein the MPH header further includes at least one of error indication information indicating whether the corresponding MPH service data packet has an error, and pointer field information representing position information where new data starts at the corresponding MPH service data packet.

9. A method of processing data in a receiving system, the method comprising:

receiving a broadcasting signal where a plurality of parades and main service data are multiplexed, each parade including one or two RS frames, each of the RS frame including a plurality of MPH service data packets, each of the MPH service data packets including MPH header of M bytes and payload of N-M bytes, the MPH header including identification information;

demodulating data of the RS frame of the received broadcasting signal;

dividing a parade including a mobile service requested from a user, from the plurality of parades, using at least one of parade ID and service ID of the MPH header within each MPH service data packet of the demodulated RS frame;

extracting IP datagram of the mobile service data from payload of the corresponding MPH service data packet with reference to data type information of the MPH header within the MPH service data packet received in the divided parade, and temporarily storing the extracted IP datagram; and

outputting audio/video data for audio/video decoding if the temporarily stored IP datagram of the mobile service data is the audio/video data.

10. The method as claimed in claim 9, wherein the demodulating step includes detecting known data, which are known by agreement between a transmitting side and a receiving side, from the received broadcasting signal, so that the known data are used for data demodulation and channel equalization of the RS frame.

11. The method as claimed in claim 9, wherein the demodulating step includes:

converting data of the RS frame of the received broadcasting signal into base band RS frame data;

channel-equalizing the demodulated data;

performing turbo decoding for the channel equalized data in a block unit; and

correcting an error occurring in the decoded data.

12. The method as claimed in claim 9, wherein, if the plurality of parades are multiplexed in a unit of MPH frame, which includes a plurality of sub-frames, further comprising turning on the power in only a slot to which data groups of the parade including the mobile service selected by the user are allocated.

13. The method as claimed in claim 9, wherein the MPH header includes parade ID information for identifying the parade which transmits the RS frame of the corresponding MPH service data packet, service ID information for identifying the mobile service transmitted to the payload of the corresponding MPH service data packet, and data type information for identifying whether the data received in the payload within the corresponding MPH service data packet is IP datagram of mobile service data.

14. The method as claimed in claim 13, wherein the MPH header further includes at least one of error indication information indicating whether the corresponding MPH service data packet has an error, and pointer field information representing position information where new data starts at the corresponding MPH service data packet.