Abstract
In this paper, we consider an underlay setting where primary and secondary networks exist together. The secondary network uses a decode and forward (DF) secondary relay that aids the communication between secondary transmitter and receiver in presence of primary interference. The secondary relay is equipped with caching capacity and additionally it harvests energy from secondary transmitter as well as primary interference. Secondary relay uses the harvested energy to decode and forward the information to secondary destination. At relay, we adopt a time switching (TS) based policy that switches between energy harvesting and information decoding followed by caching and retransmission. We formulate an optimization problem to maximize the energy stored at secondary relay constrained to primary as well as secondary network quality of service requirements. We carry out extensive mathematical analysis to solve the formulated problem and further present simulation results to demonstrate the efficacy of the proposed scheme.
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