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Age of Information-Reliability Trade-offs in Energy Harvesting Sensor Networks

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Document pages: 23 pages

Abstract: Age of Information (AoI) is a recently defined quantity, which measures thefreshness of information in a communication scheme. In this paper, we analyze anetwork that consists of a sensor node, an energy source and a receiver. Theenergy source is broadcasting energy and the sensor is charging its batteryusing energy-harvesting technologies. Whenever the battery gets fully charged,the sensor measures some quantity (called its status) from an environment, and(or) transmits its status to the receiver. The full analysis of AoI of thisnetwork, in the setting when each status is sent once, is given previously.However, that approach does not present a reliability guarantee better than thesuccess probability of one transmission. In this paper, we present a closedform expression for the AoI of a deterministic and a randomized scheme thatguarantee a desired probability of successful transmission for each status,alongside with a zero-error scheme. Furthermore, we define a novel notioncalled AoI-reliability trade-off and present the AoI-reliability trade-offs ofour schemes. Additionally, we show that numerical results match our theoreticalfindings.

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