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

A method of transmitting a broadcast signal, the method comprising:

• generating at least one first link layer packet including data packets that include broadcast data;
• generating at least one second link layer packet including link layer signaling information;
• generating one or more broadcast frames including the at least one first link layer packet and the at least one second link layer packet;
• and
• transmitting the broadcast signal including the one or more broadcast frames,
• wherein generating the at least one first link layer packet further comprises:
• performing selectively header compression on the data packets,
• wherein, when the data packets are Transport Stream (TS) packets, information to identify whether the header compression is performed is included in a header of the at least one first link layer packet, and
• wherein, when the data packets are Internet Protocol (IP) packets, the information to identify whether the header compression is performed is included in at least the header of the at least one first link layer packet or the link layer signaling information.

An apparatus for transmitting a broadcast signal, the apparatus comprising:

• a link layer processor to generate at least one first link layer packet including data packets that include broadcast data and generate at least one second link layer packet including link layer signaling information;
• a physical layer processor to generate one or more broadcast frames including the at least one first link layer packet and the at least one second link layer packet;
• and
• a transmitting unit to transmit the broadcast signal including the one or more broadcast frames,
• wherein the link layer processor is further to:
• perform selectively header compression on the data packets,
• wherein, when the data packets are Transport Stream (TS) packets, information to identify whether the header compression is performed is included in a header of the at least one first link layer packet, and
• wherein, when the data packets are Internet Protocol (IP) packets, the information to identify whether the header compression is performed is included in at least the header of the at least one first link layer packet or the link layer signaling information.