OB-DETA: Observation-based directional energy transmission algorithm in energy harvesting networks

In directional energy transmissions, a radio frequency (RF) energy source needs to monitor each sector to achieve higher RF energy transmission efficiency. However, since the location of harvesting nodes can be dynamically changed in mobile environments, it is difficult to obtain the exact numbers o...

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Bibliographic Details
Published inJournal of communications and networks Vol. 21; no. 2; pp. 168 - 176
Main Authors Ko, Haneul, Pack, Sangheon
Format Journal Article
LanguageEnglish
Published Seoul Editorial Department of Journal of Communications and Networks 01.04.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
한국통신학회
Subjects
Algorithms
Batteries
Directional antenna
Directional antennas
Efficiency
Energy
Energy harvesting
Energy sources
Energy transmission
Markov chains
Markov processes
Nodes
Optimization
partially observable Markov decision process (POMDP)
Power efficiency
Radio frequency
radio frequency (RF) energy
RF signals
Transmission efficiency
wireless power transmission (WPT)
전자/정보통신공학
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Summary:In directional energy transmissions, a radio frequency (RF) energy source needs to monitor each sector to achieve higher RF energy transmission efficiency. However, since the location of harvesting nodes can be dynamically changed in mobile environments, it is difficult to obtain the exact numbers of harvesting nodes and the distance between harvesting nodes and the RF energy source in all sectors within limited time. In such a situation, the operations of the RF energy source (i.e., monitoring sectors and transmitting the RF energy) can be modeled by a partially observable Markov decision process (POMDP), which has high complexity to be solved. As a practical solution, we propose an observationbased directional energy transmission algorithm (OB-DETA) that estimates the efficiency of energy transmission in sectors and transmits the RF energy to the selected sectors with high energy transmission efficiency (i.e., sectors with lots of non-fully-charged harvesting nodes around the RF energy source). Evaluation results are given to demonstrate the effectiveness of OB-DETA over the comparison schemes in terms of the RF energy transmission efficiency.
ISSN:1229-2370
1976-5541
DOI:10.1109/JCN.2019.000015