Timely Status Updating Over Erasure Channels Using an Energy Harvesting Sensor: Single and Multiple Sources

A status updating system is considered in which data from multiple sources are sampled by an energy harvesting sensor and transmitted to a remote destination through erasure channel. The goal deliver updates of all timely manner, such that the cumulative long-term average age-of-information (AoI) minimized. AoI for each source defined as time elapsed since generation latest successful update received at source. Transmissions subject availability, arrives units according Poisson process, with unit capable carrying out one transmission only equipped unit-sized battery save incoming energy. scheduling policy designed order determine using available problem studied two main settings: 1) no feedback 2) perfect instantaneous feedback. For case source, it shown xmlns:xlink="http://www.w3.org/1999/xlink">renewal policies optimal, instances form renewal process. In setting without feedback, further xmlns:xlink="http://www.w3.org/1999/xlink">threshold-based if until new exceeds certain threshold. threshold-greedy policies investigated, threshold-based following transmissions, instantaneously whenever failed transmissions. optimal thresholds found closed-form terms probability. Such then extended sources, combined xmlns:xlink="http://www.w3.org/1999/xlink">round robin same repeating order; xmlns:xlink="http://www.w3.org/1999/xlink">maximum-age-first maximum given priority. both settings, achieved derived threshold, probability number sources.