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

An apparatus for transmitting broadcast signals, the apparatus comprising:

• a first processor to link process input packets to generate link layer packets,
• wherein a link layer packet of the link layer packets includes a header and a payload,
• wherein the payload of the link layer packet includes a segment of an input packet or concatenated input packets,
• wherein the header of the link layer packet includes a first field for identifying whether the payload includes the segment or the concatenated input packets,
• wherein the header further includes a second field for identifying a number of the concatenated input packets and third fields that are inserted to the header in the same order as the concatenated input packets present in the payload in response to the first field representing that the payload includes the concatenated input packets,
• wherein the third fields represent a length of each of the concatenated input packets,
• wherein a number of the third fields is determined based on the number of the concatenated input packets,
• wherein stuffing bits are added after the third fields in response to the number of the third fields that is odd, and
• wherein the header further includes a fourth field for indicating an order of the segment carried by the link layer packet in response to the first field representing that the payload includes the segment;
• a second processor to physical process the link layer packets into the broadcast signals;
• and
• a transmitter to transmit the broadcast signals.

A method of receiving broadcast signals, the method comprising:

• receiving the broadcast signals;
• physical processing the broadcast signals into link layer packets;
• and
• link processing the link layer packets to restore input packets,
• wherein a link layer packet of the link layer packets includes a header and a payload,
• wherein the payload of the link layer packet includes a segment of an input packet or concatenated input packets,
• wherein the header of the link layer packet includes a first field for identifying whether the payload includes the segment or the concatenated input packets,
• wherein the header further includes a second field for identifying a number of the concatenated input packets and third fields that are inserted to the header in the same order as the concatenated input packets present in the payload in response to the first field representing that the payload includes the concatenated input packets,
• wherein the third fields represent a length of each of the concatenated input packets,
• wherein a number of the third fields is determined based on the number of the concatenated input packets, and
• wherein the header further includes a fourth field for indicating an order of the segment carried by the link layer packet in response to the first field representing that the payload includes the segment.

An apparatus for receiving broadcast signals, the apparatus comprising:

• a tuner to receive the broadcast signals;
• a first processor to physical process the broadcast signals into link layer packets;
• and
• a second processor to link process the link layer packets to restore input packets,
• wherein a link layer packet of the link layer packets includes a header and a payload,
• wherein the payload of the link layer packet includes a segment of an input packet or concatenated input packets,
• wherein the header of the link layer packet includes a first field for identifying whether the payload includes the segment or the concatenated input packets,
• wherein the header further includes a second field for identifying a number of the concatenated input packets and third fields that are inserted to the header in the same order as the concatenated input packets present in the payload in response to the first field representing that the payload includes the concatenated input packets,
• wherein the third fields represent a length of each of the concatenated input packets,
• wherein a number of the third fields is determined based on the number of the concatenated input packets, and
• wherein the header further includes a fourth field for indicating an order of the segment carried by the link layer packet in response to the first field representing that the payload includes the segment.