Abstract—In this paper, we derive an inner bound for two- user state-dependent multiple-access relay channel (MARC) via decode and forward strategy (DF) in which the states of channel are known non-causally at the relay. The inner bound is obtained by using a combination of binning scheme and codeword splitting. Codeword splitting at the relay is applied to generating two codebooks, one for utilizing a joint codebook between the relay and the transmitters and another for utilizing the channel state information. Furthermore, we obtain an outer bound for this model. Actually, our work is a generalization of Zaidi et al. work on the relay channel with informed relay to the MARC.

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