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• W2885655651 abstract "Consider an energy harvesting (EH) sensor that continuously monitors a system and sends time-stamped status update to a destination. The sensor harvests energy from nature and uses it to power its updating operations. The destination keeps track of the system status through the successfully received updates. With the recently introduced information freshness metric Age of Information (AoI), our objective is to design optimal online status updating policy to minimize the long-term average AoI at the destination, subject to the energy causality constraint at the sensor. Due to the noisy channel between the sensor and the destination, each transmitted update may be erased with a fixed probability, and the AoI at the destination will be reset to zero only when an update is successfully received. We first consider status updating without feedback available to the sensor and show that the Best-effort Uniform updating (BU) policy is optimal. We then investigate status updating with perfect feedback to the sensor and prove the optimality of the Best-effort Uniform updating with Retransmission (BUR) policy. In order to prove the optimality of the proposed policies, for each case, we first identify a lower bound on the long-term average AoI among a broad class of online policies, and then construct a sequence of virtual policies to approach the lower bound asymptotically. Since those virtual policies are sub-optimal to the original policy, the original policy is thus optimal." @default.
• W2885655651 created "2018-08-22" @default.
• W2885655651 creator A5022801075 @default.
• W2885655651 creator A5057599205 @default.
• W2885655651 date "2018-08-13" @default.
• W2885655651 modified "2023-09-22" @default.
• W2885655651 title "Age of Information Minimization for an Energy Harvesting Source with Updating Erasures: With and Without Feedback" @default.
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• W2885655651 hasPublicationYear "2018" @default.
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