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A unified approach of energy and data cooperation in energy harvesting WSNs

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Abstract

Energy harvesting (EH) provisioned wireless sensor nodes are key enablers to increase network life time in modern wireless sensor networks (WSNs). However, the intermittent nature of the EH process necessitates management of nodes’ limited data and energy buffer capacity. In this paper, a unified mathematical model for a cooperative EHWSN with an opportunistic relay is presented. The energy and data causality constraints are expressed in terms of throughput, available energy, delay and transmission time. Considering finite energy buffers, data buffers and discrete transmission rates (as defined in the standard IEEE 802.15.4) at the nodes, different intuitive online power allocation policies at the relay are studied. The results show that a policy achieving high throughput is less fair and vice versa. Therefore, a joint rate and power allocation policy (JRPAP) is proposed in this study which provides a better trade off between fairness, throughput and energy over intuitive policies. Based on the JRPAP results, we propose to use data aggregation (DA) to achieve throughput gain at lower buffer sizes. In addition, the notion of energy aggregation (EA) is introduced to achieve throughput gain at higher buffer sizes. Combining both EA and DA further improves the overall throughput at all buffer sizes.

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Authors and Affiliations

  1. School of Electrical Engineering and Computer Science, National University of Sciences and Technology, Islamabad, 44000, Pakistan

    Roomana Yousaf & Rizwan Ahmad

  2. Department of Electrical Engineering, Pakistan Institute of Engineering and Applied Sciences, Islamabad, 44000, Pakistan

    Waqas Ahmed

  3. School of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen, 518055, China

    Fu-chun Zheng

Authors
  1. Roomana Yousaf
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  2. Rizwan Ahmad
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  3. Waqas Ahmed
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  4. Fu-chun Zheng
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Correspondence to Roomana Yousaf.

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Yousaf, R., Ahmad, R., Ahmed, W. et al. A unified approach of energy and data cooperation in energy harvesting WSNs. Sci. China Inf. Sci. 61, 082303 (2018). https://doi.org/10.1007/s11432-017-9257-1

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  • DOI: https://doi.org/10.1007/s11432-017-9257-1

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