Data transmission system

The Digital Video Broadcasting system according to any one of 1-12,

• wherein the broadcast network provider further comprises means for generating the parity data for each application data table in accordance with an FEC code;
• means for arranging each application data table, together with the corresponding parity data, in an MPE-FEC frame;
• means for generating real time parameters containing information about the structure of each MPE-FEC frame;
• means for transmitting the IP datagrams in the DVB system, said IP datagrams being-carried in dedicated MPE sections;
• means for transmitting at least a part of the parity data in a DVB system, said parity data being carried in dedicated FEC sections;
• and
• means for incorporating a subset of said real time parameters in the header of each MPE section and FEC section, using available MAC address bytes in the MPE header.

A broadcast network provider (15) comprising

• means for calculating parity information dependent on first digitally coded information, comprising IP datagrams,
• means for generating second digitally coded information;
• said second digitally coded information comprising said first digitally coded information arranged in an application data table (601) and said parity information arranged in an forward error correction coding data table (602);
• and
• an output for delivering said second digitally coded information to a relay arrangement, forward error correction being handled below the IP layer of a protocol stack used for communication.

A receiving unit (20,21;24,25;28) for receiving digitally coded information comprising first digitally coded information comprising IP datagrams arranged in application data table (601) and parity information arranged in forward error correction coding, e.g. calculated using Reed-Solomon code (RS), data tables (602);

• said receiving unit comprising means for extracting parity information from the received digitally coded information;
• means for extracting a unit of information corresponding to said first digitally coded information;
• wherein said unit of information may contain erroneous information so that said unit of information is non-identical to said first digitally coded information;
• means for generating third digitally coded information in dependence on said unit of information and said extracted parity information, said third digitally coded information being substantially identical to said first digitally code information, forward error correction being handled below the IP layer in a protocol stack used for communication.

A method for transmission of first digitally coded information via a Digital Video Broadcasting system using a forward error correction code,

• wherein said first digitally coded information comprises IP datagrams, the method comprising the steps of:
• writing the IP datagrams into an application data table;
• calculating parity information in dependence of the first digitally coded IP datagrams of the application data table;
• writing the parity information into an forward error correction coding data table;
• generating second digitally coded information comprising said first digitally coded information and said parity information,
• such that forward error correction can be handled by a layer (323;935) in a protocol stack comprising an IP layer (330b;940) whereby said layer (323;935) is below said IP layer (330b;940).

A method for receiving digitally coded information comprising first digitally coded information comprising IP datagrams in a Digital Video Broadcasting system (DVB) using a forward error correction code,

• comprising the steps of:
• extracting parity information dependent on said first digitally coded information and arranged in a forward error correction coding data table;
• extracting a unit of information corresponding to said first digitally coded information being arranged in an application data table, wherein said unit of information may contain erroneous information so that said unit of information is non-identical to said first digitally coded information;
• generating third digitally coded information in dependence on said unit of information and said extracted parity information, whereby forward error correction is handled below the IP layer of a protocol stack used for communication.