Digital broadcasting system and data processing method
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.
1. A method of processing data for a receiver, the method comprising:
receiving a broadcast signal comprising a fast information channel (FIC) containing cross layer information for mobile service acquisition, a transmission parameter channel (TPC) containing FIC version information for identifying an update of the FIC, and a Reed-Solomon (RS) frame, the RS frame comprising a plurality of mobile and handheld (M/H) transport packets, each of the plurality of M/H transport packets having an M byte header and an N-M byte payload, wherein N and M are natural numbers and N>M;
demodulating the RS frame included in the broadcast signal;
obtaining IP datagrams of desired mobile service data from the demodulated RS frame; and
decoding at least one of a video stream and an audio stream included in the obtained IP datagrams.
2. The method of claim 1 , wherein the obtaining the IP datagrams of the desired mobile service data from the demodulated RS frame comprises:
forming an ensemble identified by an ensemble identifier from the demodulated RS frame; and
obtaining the IP datagrams of the desired mobile service data from the ensemble.
3. The method of claim 1 , wherein at least one of the plurality of M/H transport packets has an M byte header including field information and an N-M byte payload including the IP datagrams of the desired mobile service data.
4. The method of claim 3 , wherein obtaining IP datagrams of desired mobile service data from the demodulated RS frame comprises:
identifying the at least one of the plurality of M/H transport packets including the IP datagrams of the desired mobile service data using the field information; and
extracting the IP datagrams of the desired mobile service data from a payload of the identified at least one of the plurality of M/H transport packets.
5. The method of claim 3 , wherein the field information comprises data type information indicating that the payload of the at least one of the plurality of M/H transport packets includes the IP datagrams of the desired mobile service data.
6. The method of claim 3 , wherein the field information comprises error indication information indicating whether the at least one of the plurality of M/H transport packets contains an error.
7. The method of claim 3 , wherein the field information comprises pointer field information signaling a starting point of a first new IP datagram in the payload of the at least one of the plurality of M/H transport packets.
8. The method of claim 3 , wherein a value of the M is 2.
9. The method of claim 1 , further comprising detecting known data from the broadcast signal.
10. The method of claim 9 , further comprising channel-equalizing the demodulated RS frame using the detected known data.
11. A receiver comprising:
a receiving unit configured to receive a broadcast signal comprising a fast information channel (FIC) containing cross layer information for mobile service acquisition, a transmission parameter channel (TPC) containing FIC version information for identifying an update of the FIC, and a Reed-Solomon (RS) frame, the RS frame comprising a plurality of mobile and handheld (M/H) transport packets, each of the plurality of M/H transport packets having an M byte header and an N-M byte payload, wherein N and M are natural numbers and N>M;
a demodulator configured to demodulate the RS frame included in the broadcast signal;
a processor configured to obtain IP datagrams of desired mobile service data from the demodulated RS frame; and
a decoder configured to decode at least one of a video stream and an audio stream from the obtained IP datagrams.
12. The receiver of claim 11 , wherein the processor forms an ensemble identified by an ensemble identifier from the demodulated RS frame and obtains the IP datagrams of the desired mobile service data from the ensemble.
13. The receiver of claim 11 , wherein at least one of the plurality of M/H transport packets has an M byte header including field information and an N-M byte payload including the IP datagrams of the desired mobile service data.
14. The receiver of claim 13 , wherein the processor identifies the at least one of the plurality of M/H transport packets including the IP datagrams of the desired mobile service data using the field information, and extracts the IP datagrams of the desired mobile service data from a payload of the identified at least one of the plurality of M/H transport packets.
15. The receiver of claim 13 , wherein the field information comprises data type information indicating that the payload of the at least one of the plurality of M/H transport packets includes the IP datagrams of the desired mobile service data.
16. The receiver of claim 13 , wherein the field information comprises error indication information indicating whether the at least one of the plurality of M/H transport packets contains an error.
17. The receiver of claim 13 , wherein the field information comprises pointer field information signaling a starting point of a first new IP datagram in the payload of the at least one of the plurality of M/H transport packets.
18. The receiver of claim 13 , wherein a value of the M is 2.
19. The receiver of claim 11 , further comprising a known data detector configured to detect known data from the broadcast signal.
20. The receiver of claim 19 , further comprising a channel equalizer configured to channel-equalize the demodulated RS frame using the detected known data.
21. The method of claim 1 , wherein the FIC and TPC are encoded using a first encoding code and the RS frame is encoded using a second encoding code.
22. The method of claim 21 , wherein the first encoding code is a Parallel Concatenated Convolutional Code (PCCC) and the second encoding code is a Serial Concatenated Convolutional Code (SCCC).
23. The receiver of claim 11 , wherein the FIC and TPC are encoded using a first encoding code and the RS frame is encoded using a second encoding code.
24. The receiver of claim 23 , wherein the first encoding code is a Parallel Concatenated Convolutional Code (PCCC) and the second encoding code is a Serial Concatenated Convolutional Code (SCCC).
25. A method of processing data for a receiver, the method comprising:
receiving a broadcast signal comprising fast information channel (FIC) data containing cross layer information for mobile service acquisition, transmission parameter channel (TPC) data containing FIC version information for identifying an update of the FIC data, and mobile service data, wherein the mobile service data are encapsulated into an RS frame, the RS frame comprising a plurality of mobile and handheld (M/H) transport packets, each of the plurality of M/H transport packets including an M-byte header, k stuffing bytes, and an (N-M-k)-byte payload, wherein N and M are natural numbers, and k is equal to or greater than 0;
demodulating the received broadcast signal;
acquiring IP datagrams of desired mobile service data from the RS frame included in the demodulated broadcast signal; and
decoding at least one of a video stream and an audio stream delivered through the acquired IP datagrams.
26. A receiver comprising:
a receiving unit for receiving a broadcast signal comprising fast information channel (FIC) data containing cross layer information for mobile service acquisition, transmission parameter channel (TPC) data containing FIC version information for identifying an update of the FIC data, and mobile service data, wherein the mobile service data are encapsulated into an RS frame, the RS frame comprising a plurality of mobile and handheld (M/H) transport packets, each of the plurality of M/H transport packets including an M-byte header, k stuffing bytes, and an (N-M-k)-byte payload, wherein N and M are natural numbers, and k is equal to or greater than 0;
a demodulator for demodulating the received broadcast signal;
a processor for acquiring IP datagrams of desired mobile service data from the RS frame included in the demodulated broadcast signal; and
a decoder for decoding at least one of a video stream and an audio stream delivered through the acquired IP datagrams.