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In this paper, the authors define a Multi-Access Interference (MAI) cost that can assess the extra interference, inherent to relaying use and perceived by the whole cellular network. This MAI cost shadows an implicit and smart power control for CDMA uplink communications. In fact, this cost takes into account not only the reception quality required at the serving base station but also the global interference generated to all others base stations in the cellular system. Here, the optimization goal aims to enhance the system performance, in terms of Packet-Error-Rate (PER), for a required Quality of Service (QoS). The optimization approach is achieved for both Decode-and-Forward (DF) and Incremental DF relaying schemes, carried out on packet-by-packet basis.
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