Method and a device for relaying in a communications network

A selective relaying device for a communications network having a plurality of sources and a reception device, the relaying device comprising:

• means for receiving messages transmitted respectively by the sources to obtain estimated messages;
• means for detecting errors in the estimated messages;
• means for transmitting a signal to the reception device, the signal being representative of only messages detected without error and resulting from a network and channel coding comprising a modulo-2 addition of the messages detected without error;
• and
• wherein the signal is transmitted by said relay device to the reception device with a control signal indicating the at least one message represented in the transmitted signal.

A method of receiving messages, the message-reception method being implemented in a reception device of a MARC system having a plurality of sources and a relay, the method comprising:

• receiving messages by the reception device from the sources;
• receiving a signal by the reception device from the relay,
• wherein the signal is representative of only messages received from the sources and detected without error by the relay and is the result of a network and channel coding comprising a modulo-2 addition of those messages detected without error,
• receiving a control signal by the reception device from the relay, wherein the control signal indicates which of the messages are represented in the signal;
• and
• applying detection/decoding by the reception device jointly to the received messages coming from the sources and to the received signal from the relay, under control of the control signal coming from the relay.