Abstract: A solution is disclosed for using low-density parity check codes in connection with a retransmission scheme. A first apparatus encodes a data bit set by using a first parity check matrix in a low-density parity check encoder. The first apparatus transmits the encoded data bit set and some parity bits of the set to a second apparatus in a message, and determines that the second apparatus was not capable of decoding the data bit set. The first apparatus modifies the first parity check matrix by using an overlapping matrix where overlapping elements of the first parity check matrix and the overlapping matrix are combined into a second parity check matrix. The first apparatus encodes the data bit set by using the second parity check matrix to provide a second parity bit set, and transmits at least some parity bits of the second parity bit set to the second apparatus.

Abstract: This document discloses a solution for using low-density parity check codes in connection with a retransmission scheme in a wireless network.