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

1. A method for transmitting broadcast signals, the method comprising:

encapsulating input packets including Internet Protocol (IP) packets or Transport Stream (TS) packets into link layer packets in a link layer,

each header of the link layer packets including a base header having packet type information representing a type of the input packets in a payload of each link layer packet and payload configuration information representing a configuration of the payload of each link layer packet,

for a first link layer packet including a single packet, a base header of the first link layer packet includes header mode information having a value representing that an additional header for the single packet is present following the base header,

for a second link layer packet including a segmented packet, a base header of the second link layer packet includes S/C (segmentation/concatenation) information having a value representing that an additional header for the segmented packet is present following the base header,

for a third link layer packet including a concatenated packet, a base header of the third link layer packet includes S/C information having a value representing that an additional header for the concatenated packet is present following the base header;

processing the link layer packets including the first link layer packet, the second link layer packet, and the third link layer packet into data packets carried by a Data Pipe (DP) in a physical layer; and

transmitting a broadcast signal including the data packets.

2. The method according to claim 1 , wherein each additional header is followed by an optional header.

3. The method according to claim 2 , wherein each additional header includes information representing that the optional header is present following the additional header.

4. An apparatus for transmitting broadcast signals, the apparatus comprising:

an encapsulator configured to encapsulate input packets including Internet Protocol (IP) packets or Transport Stream (TS) packets into link layer packets in a link layer,

each header of the link layer packets including a base header having packet type information representing a type of the input packets in a payload of each link layer packet and payload configuration information representing a configuration of the payload of each link layer packet,

for a first link layer packet including a single packet, a base header of the first link layer packet includes header mode information having a value representing that an additional header for the single packet is present following the base header,

for a second link layer packet including a segmented packet, a base header of the second link layer packet includes S/C (segmentation/concatenation) information having a value representing that an additional header for the segmented packet is present following the base header,

for a third link layer packet including a concatenated packet, a base header of the third link layer packet includes S/C information having a value representing that an additional header for the concatenated packet is present following the base header;

a processor configured to process the link layer packets including the first link layer packet, the second link layer packet, and the third link layer packet into data packets carried by a Data Pipe (DP) in a physical layer; and

a transmitter configured to transmit a broadcast signal including the data packets.

5. The apparatus according to claim 4 ,

wherein each additional header is followed by an optional header.

6. The apparatus according to claim 5 ,

wherein each additional header includes information representing that the optional header is present following the additional header.

7. A method for receiving broadcast signals, the method comprising:

receiving broadcast signals including at least one signal frame,

the at least one signal frame including data packets carried by a Data Pipe (DP), and the data packets including link layer packets in which input packets including Internet Protocol (IP) packets or Transport Stream (TS) packets are encapsulated in a link layer;

processing the data packets; and

decapsulating the link layer packets,

each header of the link layer packets including a base header having packet type information representing a type of the input packets in a payload of each link layer packet and payload configuration information representing a configuration of the payload of each link layer packet,

for a first link layer packet including a single packet, a base header of the first link layer packet includes header mode information having a value representing that an additional header for the single packet is present following the base header,

for a second link layer packet including a segmented packet, a base header of the second link layer packet includes S/C (segmentation/concatenation) information having a value representing that an additional header for the segmented packet is present following the base header,

for a third link layer packet including a concatenated packet, a base header of the third link layer packet includes S/C information having a value representing that an additional header for the concatenated packet is present following the base header.

8. The method according to claim 7 ,

wherein each additional header is followed by an optional header.

9. The method according to claim 8 ,

wherein each additional header includes information representing that the optional header is present following the additional header.

10. An apparatus for receiving broadcast signals, the apparatus comprising:

a tuner configured to receive broadcast signals including at least one signal frame,

the at least one signal frame including data packets carried by a Data Pipe (DP), and the data packets including link layer packets in which input packets including Internet Protocol (IP) packets or Transport Stream (TS) packets are encapsulated in a link layer;

a processor configured to process the data packet; and

a decapsulator configured to decapsulate the link layer packets;

each header of the link layer packets including a base header having packet type information representing a type of the input packets in a payload of each link layer packet and payload configuration information representing a configuration of the payload of each link layer packet,

for a first link layer packet including a single packet, a base header of the first link layer packet includes header mode information having a value representing that an additional header for the single packet is present following the base header,

for a second link layer packet including a segmented packet, a base header of the second link layer packet includes S/C (segmentation/concatenation) information having a value representing that an additional header for the segmented packet is present following the base header,

for a third link layer packet including a concatenated packet, a base header of the third link layer packet includes S/C information having a value representing that an additional header for the concatenated packet is present following the base header.

11. The apparatus according to claim 10 ,

wherein each additional header is followed by an optional header.

12. The apparatus according to claim 11 ,

wherein each additional header includes information representing that the optional header is present following the additional header.