Device and method for transmitting/receiving a packet in communication system

• US 9,906,326 B2
• Filed: 02/21/2017
• Issued: 02/27/2018
• Est. Priority Date: 11/24/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Hwang, Sung-Hee, Park, Kyung-Mo, Rhyu, Sung-Ryeul, Yang, Hyun-Koo, Hwang, Sung-Oh
• Primary Examiner(s): ABRAHAM, ESAW T
• Application Number:
  US15/438,439
• Publication Number:
  US 20170230139A1
• Time in Patent Office: 371 Days
• CPC Class Codes: H03M 13/1102 Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/2906 using block codes H03M13/2957 takes precedence
• CPC Class Codes: H03M 13/35 Unequal or adaptive error protection, e.g. by providing a different level of protection according to significance of source information or by adapting the coding according to the change of transmission channel characteristics
• CPC Class Codes: H03M 13/3761 using code combining, i.e. using combining of codeword portions which may have been transmitted separately, e.g. Digital Fountain codes, Raptor codes or Luby Transform [LT] codes
• CPC Class Codes: H03M 13/618 Shortening and extension of codes
• CPC Class Codes: H03M 13/6356 by repetition or insertion of dummy data, i.e. rate reduction
• CPC Class Codes: H03M 13/6362 by puncturing
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0066 Parallel concatenated codes
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 1/008 where the control data relates to payload of a different packet
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04N 19/30 using hierarchical techniques, e.g. scalability H04N19/63 takes precedence
• CPC Class Codes: H04N 19/89 involving methods or arrangements for detection of transmission errors at the decoder

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.

Claims

1. A method for receiving multimedia contents in a broadcast system, the method comprising:

receiving forward error correction (FEC) source packets comprising source symbols and FEC repair packets comprising repair symbols from a transmitting entity;

receiving a FEC message comprising FEC configuration information from the transmitting entity;

identifying an FEC configuration information and an FEC code to be applied to an FEC encoded flow comprising a FEC source flow and at least one FEC repair flow based on the FEC configuration information;

identifying the repair symbols composing the at least one FEC repair flow and the source symbols; and

recovering data packets by using the FEC code, the source symbols and the repair symbols.

2. The method of claim 1, wherein the FEC message comprises at least one of:

information indicating whether there is at least one source flow applied to FEC coding;

information on an FEC flow descriptor indicating information on the FEC encoded flow; and

information on a length of the FEC flow descriptor.

3. The method of claim 2, wherein the FEC flow descriptor comprises at least one of:

information on a source flow identifier for identifying an FEC source flow;

information on the FEC flow identifier for identifying an FEC encoded flow;

information on a number of FEC encoded flows;

information on a number of assets that belongs to a same FEC source flow; and

information indicating an applied FEC coding structure for an associated FEC source flow.

4. The method of claim 2, wherein the FEC flow descriptor comprises at least one of:

information for indicating a type of mode used for generating a source symbol block;

information on a length of a repair symbol;

information on a number of repair symbol carried in an FEC repair packet; and

information on a number of symbol element consisting a source symbol.

5. The method of claim 2, wherein, if the FEC coding structure is a one stage FEC coding structure, the FEC flow descriptor comprises at least one of:

information on a repair flow identifier identifying FEC repair flow;

information on an applied FEC code for an associated FEC repair flow;

information on a maximum k for indicating a maximum allowed number of source symbols in a source symbol block for the associated FEC repair flow; and

information on a maximum p for indicating a maximum allowed number of repair symbols in a repair symbol block for the associated FEC repair flow.

6. The method of claim 2, wherein, if the FEC coding structure is a two stage FEC coding structure, the FEC flow descriptor comprises at least one of:

information on a number of source subblocks consisting of a source packet block for the two stage FEC coding structure;

information on a repair flow identifier identifying FEC repair flow;

information on an applied FEC code for an associated FEC repair flow;

information on a maximum k for indicating a maximum allowed number of source symbols in a source symbol block for the associated FEC repair flow; and

information on a maximum p for indicating a maximum allowed number of repair symbols in a repair symbol block for the associated FEC repair flow.

7. The method of claim 2, wherein, if the FEC coding structure is a layer-aware FEC coding structure, the FEC flow descriptor comprises at least one of:

information on an applied FEC code for an associated FEC repair flow;

information on a repair flow identifier identifying FEC repair flow;

information on a maximum k for indicating a maximum allowed number of source symbols in a source symbol block for the associated FEC repair flow; and

information on a maximum p for indicating a maximum allowed number of repair symbols in a repair symbol block for the associated FEC repair flow.

8. An apparatus for receiving multimedia contents in a broadcast system, the apparatus comprising:

a transceiver configured to;

receive forward error correction (FEC) source packets comprising source symbols and FEC repair packets comprising repair symbols from a transmitting entity, and

receive a FEC message comprising FEC configuration information from the transmitting entity; and

a controller configured to;

identify an FEC configuration information and an FEC code to be applied to an FEC encoded flow comprising a FEC source flow and at least one FEC repair flow based on the FEC configuration information,

identify the repair symbols composing the at least one FEC repair flow and the source symbols, and

recover data packets by using the FEC code, the source symbols and the repair symbols.

9. The apparatus of claim 8, wherein the FEC message comprises at least one of:

information indicating whether there is at least one source flow applied FEC coding;

information on a FEC flow descriptor indicating information on the FEC encoded flow; and

information on a length of the FEC flow descriptor.

10. The apparatus of claim 9, wherein the FEC flow descriptor comprises at least one of:

information on a source flow identifier for identifying an FEC source flow;

information on a FEC flow identifier for identifying an FEC encoded flow;

information on the number of FEC encoded flows;

information on the number of assets that belongs to the same FEC source flow; and

information indicating an applied FEC coding structure for an associated FEC source flow.

11. The apparatus of claim 9, wherein the FEC flow descriptor comprises at least one of:

information for indicating type of mode used for generating source symbol block;

information on a length of a repair symbol;

information on the number of repair symbol carried in an FEC repair packet; and

information on the number of symbol element consisting a source symbol.

12. The apparatus of claim 9, wherein, if the FEC coding structure is a one stage FEC coding structure, the FEC flow descriptor comprises at least one of:

information on a repair flow identifier identifying FEC repair flow;

information on an applied FEC code for an associated FEC repair flow;

information on maximum k for indicating the maximum allowed number of source symbols in a source symbol block for the associated FEC repair flow; and

information on maximum p for indicating the maximum allowed number of repair symbols in a repair symbol block for the associated FEC repair flow.

13. The apparatus of claim 9, wherein, if the FEC coding structure is a two stage FEC coding structure, the FEC flow descriptor comprises at least one of:

information on the number of source subblocks consisting a source packet block for the two stage FEC coding structure;

information on a repair flow identifier identifying FEC repair flow;

information on an applied FEC code for an associated FEC repair flow;

information on maximum k for indicating the maximum allowed number of source symbols in a source symbol block for the associated FEC repair flow; and

information on maximum p for indicating the maximum allowed number of repair symbols in a repair symbol block for the associated FEC repair flow.

14. The apparatus of claim 9, wherein, if the FEC coding structure is a layer-aware FEC coding structure, the FEC flow descriptor comprises at least one of:

information on an applied FEC code for an associated FEC repair flow;

information on a repair flow identifier identifying FEC repair flow;

information on maximum k for indicating the maximum allowed number of source symbols in a source symbol block for the associated FEC repair flow; and

information on maximum p for indicating the maximum allowed number of repair symbols in a repair symbol block for the associated FEC repair flow.