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The energy harvesting cognitive radio networks (EH-CRNs) are expected to play a key role in satisfying the demands of next generation wireless communications. In the underlay CRN, the secondary base station (SBS) is prohibited to transmit at high power to keep the interference temperature within acceptable limits. Thus, the transmission to a secondary user (SU) located far away from SBS may not be possible. In this paper, we investigate cooperative EH-CRNs where an SU close to the SBS harvests the energy and helps in relaying the data of a distant SU. The aim is to maximize the sum rate of the system subject to the limited power budget at the SBS and to the interference constraint of the primary network. We seek a joint optimization framework to distribute power among users at the SBS, power allocation for cooperative transmission, the time slot optimization for transmission of each user, and the power …