Journal
IEEE COMMUNICATIONS LETTERS
Volume 23, Issue 3, Pages 534-537Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2019.2895311
Keywords
Energy efficiency; network lifetime; optimal hop distance; relay selection; wireless sensor networks
Categories
Funding
- National Natural Science Foundation of China [61471164, 61601122]
- Key Research & Development Plan of Jiangsu Province [BE2018108]
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In this letter, the impact of the optimal hop distance (OHD) on the network lifetime (NL) is analyzed in wireless sensor networks with the consideration of link quality of service (QoS) requirements. OHD is defined as the distance between the node and its next-hop's optimal relay position (ORP) to the destination node, where the ORP determines the performance of the energy-efficient relay. If OHD equals the characteristic distance (CD) of the path, the minimum-energy path for a given node pair can be achieved. Moreover, the link rate also influences the NL. Hence, considering an expected link outage probability, the minimum link rate, which is related to OHD, and its corresponding expected estimation of the average link transmit power of the node are calculated. Finally, an algorithm for joint energy-efficient relay selection and link-rate allocation based on OHD selection is proposed to extend the NL. Simulation results show that the NL can be extended when OHD is less than CD.
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