In this paper, we analyze the side information (SI) effect on the coverage region of the wireless multiple-access relay channel (MARC) in two different communications scenarios: SI only at one source and SI only at the relay. Aiming at this work, (I) a general achievable rate region is proved for wireless MARC with SI at one source and SI at the relay in two fading models (Rayleigh model, which has been widely studied in the literature; and Rician model the rate region of which for MARC has not been obtained before); (II) This obtained region, while including previous regions as its special cases, (a) shows the advantage of the SI known at the relay compared to the SI known at one encoder in removing the SI interference at the receiver (as seen in Theorem 2.2, Remark 2.1), and on the related coverage regions, too ; and (b) can be exploited to prove corresponding coverage regions; (III) Then, the SI effect on the coverage region is scrutinized in different situations (SI only at one source and SI only at the relay), and also the differences between two fading models (Rayleigh and Rician) are investigated. (IV) Finally, theoretical findings are evaluated numerically.

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