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The authors study a system in which two sources communicate with a destination with the help of a half-duplex relay. They consider a decoding strategy, based on the compute-and-forward strategy, in which the destination decodes two integer-valued linear combinations that relate the transmitted code-words. In this strategy, the relay compresses its observation using Wyner-Ziv compression and then forwards it to the destination. The destination appropriately combines what it gets from the direct transmission and the relay. Then, using this combination, it computes two integer-valued linear combinations. They discuss the encoding/decoding strategy, and evaluate the achievable sum-rate.
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