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

作     者：Roomana YOUSAF Rizwan AHMAD Waqas AHMED Fu-chun ZHENG 

作者机构：School of Electrical Engineering and Computer Science National University of Sciences and Technology Department of Electrical Engineering Pakistan Institute of Engineering and Applied Sciences School of Electronic and Information Engineering Harbin Institute of Technology 

出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))

年 卷 期：2018年第61卷第8期

页      面：170-182页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 080202[工学-机械电子工程] 08[工学] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 081001[工学-通信与信息系统] 0802[工学-机械工程] 

主　　题：energy harvesting energy causality data causality energy aggregation data aggregation opportunistic relay 

摘      要：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 *** 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 *** 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.