Abstract
In this article, we investigate the integration of NOMA into cooperative relaying. We first introduce several fundamental cooperative NOMA network structures, and then classify them into two categories: user relaying and dedicated relaying. After that, we discuss the combination of cooperative NOMA with various advanced transmission technologies, such as full-duplex, cognitive radio, energy harvesting and multiple-input multiple-output. Following this, we focus on system evaluation and resource allocation of cooperative NOMA. Finally, major challenges and open issues are highlighted.
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