Broadcast signal transmitting apparatus, broadcasting data using FEC and methods thereof

Abstract

Disclosed are a broadcast signal transmitting apparatus, a broadcast signal receiving apparatus, and a broadcast signal transceiving method in the broadcast signal transmitting and receiving apparatuses. The broadcast signal transmitting method comprises the steps of: compressing headers of data packets which are included in an Internet protocol (IP) stream identified by access information, wherein the compressed data packets include a first packet containing both static information and dynamic information in the header thereof, and a second packet containing dynamic information in the header thereof; splitting the static information from the header of the first packet and diverting the remaining part thereof into the second packet; outputting an IP stream, which includes the second packet, via a data physical layer pipe (PLP); outputting, via a common PLP, a common stream, which includes the static information of the header of the first packet split in the previous step, compression information and IP-PLP mapping information for linking the IP stream and the data PLP; generating a signal frame on the basis of the data from the data PLP and the data of the common PLP; and transmitting a broadcast signal which includes the signal frame.

The invention claimed is: 
     
       1. A method of processing broadcast data in a transmitter, the method comprising:
 input processing at least one input stream to output one or multiple Physical Layer Pipes (PLPs) by an input processor, wherein each data packet of the at least one input stream has a header and a payload and the header is compressed;   Forward Error Correction (FEC) encoding PLP data of the one or multiple PLPs for each PLP by an encoder;   bit interleaving the FEC-encoded PLP data by a bit interleaver;   time interleaving the bit-interleaved PLP data by a time interleaver;   building a signal frame including the time-interleaved PLP data by a frame builder;   inserting pilot data into the built signal frame by an inserter; and   modulating the signal frame having the pilot data by a modulator,   wherein the signal frame further includes signaling data, and wherein the signaling data include type information for indicating a type of the input stream.   
     
     
       2. The method of  claim 1 , wherein when the type information indicates that the input stream is an IP stream, the each data packet is equal to an Internet Protocol (IP) packet. 
     
     
       3. The method of  claim 1 , further comprising:
 frequency interleaving the time-interleaved PLP data.   
     
     
       4. The method of  claim 1 , wherein the signal frame further includes pilot data information related to pilot pattern information of the pilot data. 
     
     
       5. A transmitter for processing broadcast data, the transmitter comprising:
 an input processor to process at least one input stream to output one or multiple Physical Layer Pipes (PLPs), wherein each data packet of the at least one input stream has a header and a payload and the header is compressed;   an encoder to Forward Error Correction (FEC) encode PLP data of the one or multiple PLPs for each PLP;   a bit interleaver to bit interleave the FEC-encoded PLP data;   a time interleaver to time interleave the bit-interleaved PLP data;   a frame builder to build a signal frame including the time-interleaved PLP data;   an inserter to insert pilot data into the built signal frame; and   a modulator to modulate the signal frame having the pilot data,   wherein the signal frame further includes signaling data, and wherein the signaling data include type information for indicating a type of the input stream.   
     
     
       6. The transmitter of  claim 5 , when the type information indicates that the input stream is an IP stream, the each data packet is equal to an Internet Protocol (IP) packet. 
     
     
       7. The transmitter of  claim 5 , further comprising:
 a frequency interleaver to frequency interleave the time-interleaved PLP data.   
     
     
       8. The transmitter of  claim 5 , wherein the signal frame further includes pilot data information related to pilot pattern information of the pilot data. 
     
     
       9. A broadcast signal transmitting method comprising:
 compressing headers of Internet Protocol (IP) packets included in an IP stream to generate an Initialization Refresh (IR) packet, a first IR dynamic (IR-DYN) packet, and compressed packets, wherein the IR packet includes static chain information, wherein the first IR-DYN packet includes first dynamic chain information, and wherein the IR packet further includes second dynamic chain information;   extracting the static chain information from the IR packet and converting the IR packet to a second IR-DYN packet including the second dynamic chain information; and   transmitting a broadcast signal including signaling data and service data,   wherein the signaling data include the static chain information and compression information and   wherein the service data are included in the first IR-DYN packet, the second IR-DYN packet and the compressed packets.   
     
     
       10. The method of claim 9,
 wherein the signaling data are carried in a first Physical Layer Pipe (PLP), and   wherein the service data are carried in a second PLP.   
     
     
       11. The method of claim 10,
 wherein the first PLP further carries IP-PLP mapping information for linking the IP stream with the second PLP.   
     
     
       12. The method of claim 9,
 wherein the first dynamic information, the second dynamic information and headers of the compressed packets include a sequence number, respectively.   
     
     
       13. A broadcast signal receiving apparatus comprising:
 a tuner to receive a broadcast signal including signaling data and service data, wherein the signaling data include static chain information and compression information for decompression, wherein the service data are included in a first IR dynamic (IR-DYN) packet having a header that includes first dynamic chain information, a second IR-DYN packet having a header that includes second dynamic chain information, and compressed packets,   a replacer to recover an IR packet based on the static chain information and the second IR-DYN packet; and   a Robust Header Compression (RoHC) decoder to perform decompressing based on the IR packet, the first IR-DYN packet, and the compressed packets to generate an Internet Protocol (IP) packet stream including IP packets.   
     
     
       14. The apparatus of claim 13,
 wherein the signaling data are carried in a first Physical Layer Pipe (PLP), and   wherein the service data are carried in a second PLP.   
     
     
       15. The apparatus of claim 14, wherein the first PLP further carries IP-PLP mapping information for linking the IP stream with the second PLP. 
     
     
       16. The apparatus of claim 13, wherein the first dynamic information, the second dynamic information and headers of the compressed packets include a sequence number, respectively. 
     
     
       17. A broadcast signal transmitting method comprising:
 compressing headers of Internet Protocol (IP) packets included in an IP stream to generate an Initialization Refresh (IR) packet, an IR dynamic (IR-DYN) packet, and compressed packets, wherein the IR packet includes static chain information and first dynamic chain information and wherein the IR-DYN packet includes second dynamic chain information;   extracting the static chain information and the first dynamic chain information from the IR packet and converting the IR packet to a first compressed packet, the first compressed packet having a sequence number that is matched with a sequence number in the first dynamic chain information;   extracting the second dynamic chain information from the IR-DYN packet and converting the IR-DYN packet to a second compressed packet, the second compressed packet having a sequence number that is matched with a sequence number in the second dynamic chain information; and   transmitting a broadcast signal including first Physical Layer Pipe (PLP) data carried in a first PLP and second PLP data carried in a second PLP,   wherein the first PLP data include the static chain information, the first dynamic chain information, the second dynamic chain information, and compression information, and   wherein the second PLP data include the first compressed packet, the second compressed packet and the generated compressed packets.   
     
     
       18. The method of claim 17, wherein the first PLP data further include IP-PLP mapping information for linking the IP stream with the second PLP. 
     
     
       19. The method of claim 18, wherein the IP-PLP mapping information includes access information of the IP stream and an identifier for identifying the second PLP. 
     
     
       20. The method of claim 17, wherein the compression information includes a context identifier (CID) of a compressed IP stream and profile information for identifying a range of protocols used to compress the IP stream. 
     
     
       21. A broadcast signal receiving apparatus comprising:
 a receiver to receive a broadcast signal including first Physical Layer Pipe (PLP) data carried in a first PLP and second PLP data carried in a second PLP, wherein the first PLP data include static chain information and first dynamic chain information for recovering an Initialization Refresh (IR) packet and second dynamic chain information for recovering an IR dynamic (IR-DYN) packet, wherein the second PLP data include compressed packets, and the first PLP data further include compression information for decompression;   a replacer to recover the IR packet based on the static chain information and the first dynamic chain information and a first compressed packet of the compressed packets, the first compressed packet having a sequence number that is matched with a sequence number in the first dynamic chain information and recover the IR-DYN packet based on the second dynamic chain information and a second compressed packet of the compressed packets, the second compressed packet has a sequence number that is matched with a sequence number in the second dynamic chain information; and   a Robust Header Compression (RoHC) decoder to perform decompressing based on the IR packet and the IR-DYN packet, and the compressed packets excluding the first and second compress packets to generate an Internet Protocol (IP) packet stream including IP packets.   
     
     
       22. The apparatus of claim 21,
 wherein the sequence number in the first compressed packet and the sequence number in the first dynamic chain information are used for synchronizing the static chain information and the first dynamic chain information and the first compressed packet, and   wherein the sequence number in the second compressed packet and the sequence number in the second dynamic chain information are used for synchronizing the second dynamic chain information and the second compressed packet.   
     
     
       23. The apparatus of claim 21, wherein the first PLP data further include IP-PLP mapping information for linking the IP stream with the second PLP. 
     
     
       24. The apparatus of claim 23, wherein the IP-PLP mapping information includes access information of the IP stream and an identifier for identifying the second PLP. 
     
     
       25. The apparatus of claim 21, wherein the compression information includes a context identifier (CID) of a compressed IP stream and profile information for identifying a range of protocols used to compress the IP stream.