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This paper discusses the impact of relaying in interference-limited networks by studying a two-user Gaussian Interference Channel with a Relay (ICR). Various models for relay reception and transmission are possible: the relay can receive and transmit in the same band as the sources (i.e., in-band relay reception/ transmission), or else relay reception, or both reception and transmission, can take place over orthogonal links of limited capacity (i.e., out-of-band relay reception or/and transmission). In all scenarios, the selection of either signal relaying, interference forwarding or a combination thereof for the relay operation is identified as a common design choice. While signal relaying enables the destination to obtain a stronger desired signal or additional information, interference forwarding helps removing part of the interference.
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