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Sensors 2017, 17(12), 2958; https://doi.org/10.3390/s17122958

Optimal Rate Schedules with Data Sharing in Energy Harvesting Communication Systems

1
School of Computer Science and Engineering, Southeast University, Nanjing 210018, China
2
School of Computing and Information Sciences, Caritas Institute of Higher Education, Hong Kong 999077, China
*
Author to whom correspondence should be addressed.
Received: 17 November 2017 / Revised: 13 December 2017 / Accepted: 17 December 2017 / Published: 20 December 2017
(This article belongs to the Section Sensor Networks)
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Abstract

Despite the abundant research on energy-efficient rate scheduling polices in energy harvesting communication systems, few works have exploited data sharing among multiple applications to further enhance the energy utilization efficiency, considering that the harvested energy from environments is limited and unstable. In this paper, to overcome the energy shortage of wireless devices at transmitting data to a platform running multiple applications/requesters, we design rate scheduling policies to respond to data requests as soon as possible by encouraging data sharing among data requests and reducing the redundancy. We formulate the problem as a transmission completion time minimization problem under constraints of dynamical data requests and energy arrivals. We develop offline and online algorithms to solve this problem. For the offline setting, we discover the relationship between two problems: the completion time minimization problem and the energy consumption minimization problem with a given completion time. We first derive the optimal algorithm for the min-energy problem and then adopt it as a building block to compute the optimal solution for the min-completion-time problem. For the online setting without future information, we develop an event-driven online algorithm to complete the transmission as soon as possible. Simulation results validate the efficiency of the proposed algorithm. View Full-Text
Keywords: wireless data transmission; rate schedule; data sharing; energy-efficiency; energy harvesting; algorithm design wireless data transmission; rate schedule; data sharing; energy-efficiency; energy harvesting; algorithm design
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Wu, W.; Li, H.; Shan, F.; Zhao, Y. Optimal Rate Schedules with Data Sharing in Energy Harvesting Communication Systems. Sensors 2017, 17, 2958.

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