  This letter proposes a novel relaying framework, semantic-forward (SF), for
cooperative communications towards the sixth-generation (6G) wireless networks.
The SF relay extracts and transmits the semantic features, which reduces
forwarding payload, and also improves the network robustness against intra-link
errors. Based on the theoretical basis for cooperative communications with side
information and the turbo principle, we design a joint source-channel coding
algorithm to iteratively exchange the extrinsic information for enhancing the
decoding gains at the destination. Surprisingly, simulation results indicate
that even in bad channel conditions, SF relaying can still effectively improve
the recovered information quality.
