Communication devices and methods

Second communication device configured to communicate with a first communication device, the second communication device comprising circuitry configured to

• transmit data units, a transmitted data unit comprising an information part and at least a portion of a parity part, to the first communication device;
• obtain an indication from the first communication device indicating at least one erroneous data unit that failed to be received or decoded by the first communication device;
• and
• retransmit the erroneous data unit having at least an identical information part as the corresponding originally transmitted data unit.

First communication method of a first communication device configured to communicate with a second communication device, the first communication method comprising:

• receiving data units, a received data unit comprising an information part and at least a portion of a parity part of a codeword comprising said information part and said parity part, from the second communication device;
• providing an indication to the second communication device indicating at least one erroneous data unit that failed to be received or decoded by the first communication device;
• receiving a retransmission of the erroneous data unit having an identical information part as the corresponding originally transmitted data unit;
• accumulating log-likelihood ratios (LLRs) of the erroneous data unit and the corresponding retransmission of the erroneous data unit;
• and
• decoding the data unit based on the accumulated LLRs.

Second communication method of a second communication device configured to communicate with a first communication device, the second communication method comprising:

• transmitting data units, a transmitted data unit comprising an information part and at least a portion of a parity part, to the first communication device;
• obtaining an indication from the first communication device indicating at least one erroneous data unit that failed to be received or decoded by the first communication device;
• and
• retransmitting the erroneous data unit having at least an identical information part as the corresponding originally transmitted data unit.