Relay Signal Processing in Wireless Communications. A method, an apparatus, and a computer program for transmission signal processing in a relay communication device are presented. The method comprises: acquiring a first soft estimate of a communication signal received in a relay communication device from a source communication device and a second estimate of the received communication signal, wherein the first soft estimate includes probability values for information elements comprised in the received communication signal; combining the first soft estimate and the second estimate when performing relay transmission signal processing in order to relay the received communication signal to a target communication device; and causing transmission of a relay communication signal to the target radio communication device.