Abstract-A simply described achievable rate region is obtained for the genie-aided cognitive radio channel using the Han-Kobayashi celebrated jointly decoding strategy for the interference channel and the Gel’fand- Pinsker coding scheme for channels with side information known at the transmitter, and then is simplified by Fourier-Motzkin elimination. The obtained achievable rate region (i) extends the Chong-Motani-Garg region for the interference channel to the cognitive channel and (ii) is a simplified description of Devroye-Mitran-Tarokrate region for the genie-aided cognitive radio channel.

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