Optimizing the age of information in RIS-aided SWIPT networks

W Lyu, Y Xiu, J Zhao, Z Zhang - IEEE Transactions on …, 2022 - ieeexplore.ieee.org
W Lyu, Y Xiu, J Zhao, Z Zhang
IEEE Transactions on Vehicular Technology, 2022ieeexplore.ieee.org
In this paper, a reconfigurable intelligent surface (RIS)-assisted simultaneous wireless
information and power transfer (SWIPT) network is investigated. To quantify the freshness of
the data packets at the information receiver, the age of information (AoI) is considered. To
minimize the sum AoI of the information users while ensuring that the power transferred to
energy harvesting users is greater than the demanded value, we formulate a scheduling
scheme, and a joint transmit beamforming and phase shift optimization at the access point …
In this paper, a reconfigurable intelligent surface (RIS)-assisted simultaneous wireless information and power transfer (SWIPT) network is investigated. To quantify the freshness of the data packets at the information receiver, the age of information (AoI) is considered. To minimize the sum AoI of the information users while ensuring that the power transferred to energy harvesting users is greater than the demanded value, we formulate a scheduling scheme, and a joint transmit beamforming and phase shift optimization at the access point (AP) and RIS, respectively. The alternating optimization (AO) algorithm is proposed to handle the coupling between active beamforming and passive RIS phase shifts, and the successive convex approximation (SCA) algorithm is utilized to tackle the non-convexity of the formulated problems. The improvement in terms of AoI provided by the proposed algorithm and the trade-off between the age of information and energy harvesting is quantified by the numerical simulation results.
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