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This paper considers the cooperation between primary and secondary users atinformation and energy levels when both users are energy harvesting nodes. Inparticular, a secondary transmitter helps relaying the primary message, and inturn, gains the spectrum access as a reward. Also, the primary transmittersupplies energy to the secondary transmitter if the latter isenergy-constrained, which facilitates an uninterrupted cooperation. We addressthis two-level cooperation over a finite horizon with the finite batteryconstraint at the secondary transmitter. While promising the rate-guaranteedservice to both primary and secondary users, we aim to maximize the primaryrate. We develop an iterative algorithm that obtains the optimal offline powerpolicies for primary and secondary users. To acquire insights about thestructure of the optimal solution, we examine specific scenarios. Furthermore,we investigate the effects of the secondary rate constraint and finite batteryon the primary rate and the probability of cooperation. We show that the jointinformation and energy cooperation increases the chances of cooperation andachieves significant rate gains over only information cooperation.

On Information and Energy Cooperation in Energy Harvesting Cognitive Radio