Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals

Abstract

A method of processing a broadcast signal includes physical layer processing a plurality of packets into a plurality of data pipes to form a signal frame of the broadcast signal. Further, a packet includes an emergency alert message for an emergency alert service so that a data pipe carries the emergency alert massage, the emergency alert message including a message identifier (ID) for identifying the emergency alert message and a service ID identifying a service related to the emergency alert message. The physical layer processing further includes encoding data in each data pipe; bit interleaving the encoded data in each data pipe; and time interleaving the bit interleaved data in each data pipe according to a first mode or a second mode, the first mode represents that the time interleaving is performed based on convolutional interleaving operation, the second mode represents that the time interleaving is performed based on a combination of block interleaving operation and convolutional interleaving operation; and transmitting the broadcast signal. In addition, the broadcast signal further includes physical layer signaling information, the physical layer signaling information including a signaling information representing that the data pipe carries the emergency alert message and time interleaving signaling information related to the first mode and the second mode.

What is claimed is: 
     
         1 . A method of processing a broadcast signal, comprising:
 physical layer processing a plurality of data pipes, wherein:   a data pipe carries an emergency alert message, the emergency alert message including a message identifier (ID) for identifying the emergency alert message, a service ID identifying a service related to the emergency alert message and information for identifying an issuer of the emergency alert message,   the physical layer processing further includes:   encoding data in each data pipe;   bit interleaving the encoded data in each data pipe;   time interleaving the bit interleaved data in each data pipe according to a first mode or a second mode,   the first mode represents that the time interleaving is performed based on a convolutional interleaving operation,   the second mode represents that the time interleaving is performed based on a block interleaving operation and a convolutional interleaving operation;   building a signal frame carrying the time interleaved data; and   performing frequency interleaving operation on an OFDM symbol in the signal frame; and   transmitting the broadcast signal, wherein:   the broadcast signal includes physical layer signaling information, the physical layer signaling information including signaling information for the data pipe carrying the emergency alert message and time interleaving signaling information related to the first mode or the second mode.   
     
     
         2 . The method of  claim 1 , wherein the emergency alert message is carried in an IP (Internet Protocol) packet. 
     
     
         3 . A device of processing a broadcast signal, comprising:
 a physical layer processor configured to process a plurality of data pipes, wherein:   a data pipe carries an emergency alert message, the emergency alert message including a message identifier (ID) for identifying the emergency alert message, a service ID identifying a service related to the emergency alert message and information for identifying an issuer of the emergency alert message,   the physical layer processor is further configured to:   encode data in each data pipe;   bit interleave the encoded data in each data pipe;   time interleave the bit interleaved data in each data pipe according to a first mode or a second mode,   the first mode represents that the time interleaving is performed based on a convolutional interleaving operation,   the second mode represents that the time interleaving is performed based on a block interleaving operation and a convolutional interleaving operation;   build a signal frame carrying the time interleaved data; and   perform frequency interleaving operation on an OFDM symbol in the signal frame; and   a transmitter configured to transmit the broadcast signal, wherein:   the physical layer signaling information includes signaling information for the data pipe carrying the emergency alert message and time interleaving signaling information related to the first mode or the second mode.   
     
     
         4 . The device of  claim 3 , wherein the emergency alert message is carried in an IP(Internet Protocol) packet. 
     
     
         5 . A method of processing a broadcast signal, comprising:
 receiving the broadcast signal carrying a signal frame, the signal frame including a plurality of data pipes and physical layer signaling information; and   physical layer processing the broadcast signal, the physical layer processing including:   frequency deinterleaving the broadcast signal;   decoding the physical layer signaling information of the frequency deinterleaved broadcast signal, wherein:   the physical layer signaling information include signaling information for a data pipe carrying an emergency alert message for an emergency service, time interleaving signaling information related to a first mode or a second mode of time interleaving operation,   the first mode represents that the time interleaving operation includes a convolutional interleaving operation, and the second mode represents that the time interleaving operation includes a convolutional interleaving operation and a block interleaving operation;   processing data in the data pipe based on the signaling information in order to output the emergency alert message, the processing including:   time deinterleaving the data in the data pipe of the frequency deinterleaved broadcast signal based on the time interleaving signaling information;   bit deinterleaving the time deinterleaved data in the data pipe; and   decoding the bit deinterleaved data in the data pipe, wherein:   the emergency alert message includes a message identifier (ID) for identifying the emergency alert message, a service ID identifying a service related to the emergency alert message and information for identifying an issuer of the emergency alert message.   
     
     
         6 . The method of  claim 5 , wherein the emergency alert message is carried in an IP(Internet Protocol) packet. 
     
     
         7 . A device of processing a broadcast signal, comprising:
 a tuner configured to receive the broadcast signal carrying a signal frame, the signal frame including a plurality of data pipes and physical layer signaling information; and   a physical layer processor configured to perform processing the broadcast signal, processing including:   frequency deinterleaving the broadcast signal;   decoding the physical layer signaling information of the frequency deinterleaved broadcast signal, wherein:   the physical layer signaling information include signaling information for a data pipe carrying an emergency alert message for an emergency service, time interleaving signaling information related to a first mode or a second mode of time interleaving operation,   the first mode represents that the time interleaving operation includes a convolutional interleaving operation, and the second mode represents that the time interleaving operation includes a convolutional interleaving operation and a block interleaving operation;   wherein the physical layer processor is further configured to perform processing data in the data pipe based on the signaling information in order to output the emergency alert message, the processing including:   time deinterleaving the data in the data pipe of the frequency deinterleaved broadcast signal based on the time interleaving signaling information;   bit deinterleaving the time deinterleaved data in the data pipe; and   decoding the bit deinterleaved data in the data pipe, wherein:   the emergency alert message includes a message identifier (ID) for identifying the emergency alert message, a service ID identifying a service related to the emergency alert message and information for identifying an issuer of the emergency alert message.   
     
     
         8 . The device of  claim 7 , wherein the emergency alert message is carried in an IP (Internet Protocol) packet.