Transmission of redundancy data in a hybrid network system

A hybrid broadband/broadcast network system comprising a broadcast network dedicated to transmission of broadcast services and a broadband network dedicated to transmission of at least unicast services, the system comprising at least one network entity comprising a processor configured for:

• selecting a transmission mode for transmitting redundancy data among a plurality of retransmission modes supported by the broadband network;
• obtaining redundancy data, said redundancy data comprising information for decoding broadcast services broadcasted by the broadcast network;
• and a base station of the broadband network being configured for transmitting the obtained redundancy data according to the selected transmission mode;
• wherein the plurality of transmission modes comprises at least one pre-emptive redundancy on demand (RoD) mode according to which a quantity of redundancy data is only a fraction of a quantity of payload data of the broadcast services and the redundancy data is obtained according to a predetermined rule and, wherein the redundancy data is broadcasted by the base station of the broadband network;
• wherein an amount of redundancy data is adapted based on a number of requests for redundancy data received by the base station from user equipments in the coverage area of the base station.

A user equipment comprising:

• a first interface for receiving data of a broadcast service broadcasted by a broadcast network;
• at least one unit configured to decode the data of the broadcast services received by the first interface;
• a second interface for communicating with at least one base station of a broadband network;
• a processor configured for:
• detecting that the at least one unit fails to decode said data;
• determining an information relating to an amount of required redundancy data;
• generating a request for redundancy data identifying the at least one frame and comprising the information relating to an amount of required redundancy data;
• receiving from the base station redundancy data according to the request for redundancy and according to a transmission mode for transmitting redundancy data among a plurality of transmission modes;
• forwarding the redundancy data received by the second interface to the at least one unit;
• wherein the plurality of transmission modes comprises at least one pre-emptive RoD mode according to which a quantity of redundancy data is only a fraction of a quantity of the payload data of the broadcast services and the redundancy data is obtained according to a predetermined rule and, wherein the redundant data is broadcasted by the base station of the broadband network;
• wherein the amount of redundancy data is adapted based on a number of requests for redundancy data received by the base station from user equipments in the coverage area of the base station.