Abstract: A transmitting apparatus includes a frame generator configured to map data included in an input stream to at least one signal processing path to generate a frame, an information inserter configured to insert signaling information to a signaling region of the frame, and a transmitter configured to transmit the frame with the signaling information inserted therein. The signaling information including input stream synchronizer (ISSY) mode information, receiver buffer size information required according to the ISSY mode information, and time information representing a time between a P1 symbol of a preset frame for transmitting a user packet and an output of a preset bit of a first user packet of the user packet.

Abstract: The present disclosure relates to a method of transmitting multimedia content in a broadcast communication system, and comprises the steps of: identifying protocol information mapped for each service corresponding to multimedia content; transmitting service-related information including the identified protocol information mapped for each service; and transmitting multimedia content corresponding to related services to a receiving side by using the identified protocol.

Abstract: A method and an apparatus for encoding, transmitting, and receiving signaling information in a broadcasting/communication system are provided. The method includes generating the signaling information which comprises a plurality of pieces; determining a number of coded blocks to which the signaling information is to be encoded, based on a number of bits of the signaling information and a number of encoder input information bit; segmenting each piece of the signaling information based on the number of the coded blocks; constructing input information bits of each coded block to include segmented parts of each piece of the signaling information; encoding the input information bits to each coded block; and transmitting each coded block.

Abstract: A method by which a signal transmission device transmits packets in a communication system is provided. The method includes the operations of, generating a source symbol block including one or more source symbols having the same length by using a source packet block including one or more source packets; generating a restoration symbol block generated using one or more restoration symbols by performing a forward error correction (FEC) coding operation on the source symbol block; generating an FEC source packet including the source packets and an FEC payload identifier (ID) and transmitting the FEC source packet to a lower protocol; generating an FEC restoration packet including one or more of the restoration symbols and the FEC payload ID and transmitting the FEC restoration packet to the lower protocol; and transmitting FEC configuration information including information on the source symbol block generation operation to a receiver.

Abstract: A method and apparatus are provided for transmitting an LDPC code in a multimedia system. The method includes generating an LDPC code based on a resulting parity check matrix which is generated by performing a row splitting operation on a base parity check matrix; and transmitting the LDPC code. The row splitting operation includes splitting each row block included in the base parity check matrix into row blocks, a number of the row blocks is determined based on a splitting factor, and the splitting factor is determined based on a number of repair symbols included in a repair symbol block of the base parity check matrix, a number of rows included in the base parity check matrix, and a scaling factor for determining a size of each permutation matrix in the resulting parity check matrix and a size of each zero matrix included in the resulting parity check matrix.

Abstract: The present invention relates to a device and method for transmitting/receiving a packet in a communication system. The present invention includes: the processes of determining at least one MPEG media transport (MMT) asset protected by an application layer forward error correction (AL-FEC); determining at least one FEC flow for transmitting the at least one MMT asset; determining the MMT asset transmitted from the at least one FEC flow in each case and determining an FEC coding structure to apply to the at least one FEC flow; producing at least one source flow by dividing the MMT asset transmitted from the at least one FEC flow on a transmission unit basis; and producing and transmitting at least one parity flow by performing AL-FEC encoding on the at least one source flow according to the FEC coding structure.

Abstract: A method and apparatus for decoding received packets in a broadcasting and communication system is provided. The method includes reconstructing a source block by arranging source packets received from a sender on a two-dimensional array having a width of a given symbol size, and determining at least one Erased Subdivided Encoding Symbol Index (E-SESI) corresponding to at least one source packet which is not successfully received in the reconstructed source block, determining a symbol unit for Forward Error Correction (FEC) decoding based on the at least one E-SESI, and performing FEC decoding on the reconstructed source block depending on the determined symbol unit.

Abstract: The present disclosure provides a data transmission method of a system in an IP based broadcasting network, the data transmission method comprising the steps of: generating an MPEG media transport protocol (MMTP) packet using a media processing unit (MPU) for a service; generating an IP packet using the MMTP packet; generating a layer 2 (L2) packet using the IP packet and generating a layer 1 (L1) packet stream using the L2 packet; and transmitting the L1 packet stream, wherein absolute time information of the system is included in one of a transmission frame of the L1 packet stream and the L2 packet.

Abstract: The present invention provides a method and an apparatus for transmitting and receiving packets in a broadcast and communication system. The present invention comprises: generating a repair packet by encoding a source packet with an error correction code; and transmitting the source packet to a first network and transmitting the repair packet to a second network, wherein the number of repair packets is determined according to the maximum transmission delay values of the first and second networks.

Abstract: A method for providing a broadcast service, according to the present invention, comprises the steps of: if a broadcast service is provided by means of two or more networks, obtaining the maximum value among the fixed end-to-end delay of each network; and, on the basis of the maximum value, controlling an output point of a receiver which received packets of the broadcast service.

Abstract: A method for generating a packet of transmitting apparatus is provided. The method includes: setting a value of a Deleted Null Packet (DNP) counter to zero; increasing the value for each deleted null packet preceding a non-null transport stream (TS) packet; and generating a packet comprising a header and a payload, wherein the header includes a DNP field, the payload includes the non-null TS packet, and the value of the DNP counter is used to set the DNP field.

Abstract: A method for transmitting a packet in a communication system is provided. The method includes dividing a data stream into data payloads of a predetermined size and adding a common header to each of the data payloads, to generate a source payload, adding a first Forward Error Correction (FEC) payload Identifier (ID) to the source payload and applying an FEC code thereto, to generate an FEC source packet for a source payload, adding a second FEC payload ID to at least one parity payload and applying an FEC code thereto, to generate an FEC parity packet for the at least one parity payload, and transmitting the FEC source packet and the FEC parity packet.

Abstract: A data processing method of a transmitting apparatus includes generating a frame including at least one data packet, inserting, using the transmitting apparatus, a header including information associated with a data field occupied by the at least one data packet into the frame, and transmitting, to a receiving apparatus, the frame into which the header is inserted, wherein the information associated with the data field includes first information indicating whether a start byte of a first data packet is included in the data field and second information indicating whether an end byte of a last data packet is included in the data field.

Abstract: A method and an apparatus for transmitting and receiving a packet in a broadcasting and communication system are provided. The method includes splitting a source packet block including source packets into a plurality of source packet subblocks, converting the source packet subblocks to source symbol subblocks, respectively, generating a plurality of first repair symbol blocks by encoding the source packet subblocks using a first error correction code, configuring an error correction source packet by adding a source error correction payload IDentifier (ID) to source symbols included in the source symbol subblocks and configuring an error correction repair packet by adding a repair error correction payload ID to repair symbols included in the first repair symbol subblocks, and transmitting the error correction source packet and the error correction repair packet.

Abstract: A method and an apparatus for transmitting and receiving a packet in a broadcasting and communication system are provided. The method and apparatus allows a receiver to recognize data in a packet lost due to data loss occurring in a network. To this end, Forward Error Correction (FEC) control-related information is generated, a packet including the generated FEC control-related information is generated, and the packet is transmitted. The FEC control-related information includes at least one of FEC configuration-related information and FEC encoding configuration-related information.

Abstract: A method for receiving media data by a receiving apparatus in a multimedia system, the method comprising: receiving, from a transmission apparatus, a signaling message; and decoding media data corresponding to each of at least two assets based on control information included in the signaling message; wherein the control information includes time information to control an output time of decoded media data for each of the at least two asset.

Abstract: The present invention relates to a method for generating, by a transmission device, a packet in a broadcasting and/or communication system, the method comprising the steps of: generating a first source symbol block consisting of one or more source symbols with the same length using a source packet block consisting of one or more source packets; performing a forward error correction (FEC) coding operation on the first source symbol block; generating a second source symbol block containing information about each source packet constituting the source packet block; and generating a second recovery symbol block with one or more recovery symbols by performing an FEC coding operation on the second source symbol block.

Abstract: The present invention provides a method for transmitting a frame in a communication system that generates layer 2 (L2) signalling information related to an L2 service, that checks whether a baseband frame (BBF) exists that is divided from BBFs forming a frame and respectively included in the frame and other frames, that constitutes the frame such that a baseband packet (BBP) corresponding to the first BBF of the BBFs includes the L2 signalling information if there is no BBF included in the respective frame and the other frames, and that transmits the same.

Abstract: The present disclosure relates to a broadcasting method of a transmission apparatus in an IP-based broadcast network, the method comprising: an operation of generating an MPEG media transport protocol (MMTP) packet using a media processing unit (MPU) for a service; an operation of determining an IP session identifier for identifying an IP session for the service, and generating an IP packet using the MMTP packet and the IP session identifier; and an operation of transmitting the generated IP packet in a radio frequency (RF) channel, wherein the IP session identifier maps a combination of a source IP address, a destination IP address and a destination port for the IP packet, and at least one of the IP session identifier, the source IP address, the destination IP address and the destination port is transferred through a first layer signaling.

Abstract: The present invention relates to a method for transmitting a packet in a communication system, the method comprising: generating drop information indicating at least one source packet to be dropped among source packets to be transmitted and whether or not to drop each of the other source packets except the at least one source packet; performing forward error correction (FEC) encoding on the drop information and the other source packets except the at least one source packet; generating a repair packet comprising repair data for restoring the drop information and a repair symbol for restoring the other source packets except the at least one source packet; and transmitting the other source packets except the at least one source packet and the repair packet.